Climate of New Zealand

Köppen climate typesof New Zealand

Theclimate of New Zealandis varied due to the country'sdiverse landscape.Most regions ofNew Zealandbelong to the temperate zone with amaritime climate(Köppen climate classification:Cfb) characterised by four distinct seasons. Winters are relatively mild and summers comparatively cool. The main contributing factors are thePacific Oceanand latitude, although the mountain ranges can cause significant climate variations in locations barely tens of kilometres from each other. Conditions vary from extremely wet on theWest Coastof theSouth Islandto almostsemi-aridinCentral OtagoandsubtropicalinNorthland.

Weather

TheMeteorological Service of New Zealand Limited(MetService), established as astate-owned enterprisein 1992, issuesweather forecastsand official weather warnings.

Rainfall

Most cities receive between 618 mm or 24.3 in (as inChristchurch) and 1,317 mm or 51.9 in (Whangārei) of precipitation annually.Rainfall is distributed uniformly throughout the year in most parts of the country, especially in theSouth Island.Northern and eastern parts of the country, includingAuckland,ChristchurchandWellingtonsee a slight winter maximum consistent with aMediterranean climate.Summer and autumn maxima can be found in places closer to the southwest, such asInvercargillandMilford Sound.

How much rain a place receives is highly dependent on topography. TheSouthern Alps,theNorth Island Volcanic Plateauand surrounding ranges can produce large variation in rainfalls in places barely tens of kilometres apart.Milford Soundreceives over 6,700 mm (264 Inches) of the rainfall a year on average while barely 100 km (62 Miles) awayAlexandrainCentral Otagoreceives only slightly greater than 300 mm annually, giving it a borderline oceanic/semi-aridclimate.Air laden with water vapour from the ocean is pushed from the west in response to Earth’s rotation. This weather circulates the southern seas largely unimpeded by land until it reaches the Southern Alps. The humid westerly wind is forced up over the mountains, at cooler elevation water condenses and falls as snow or rain. This orographic rain explains the huge difference in conditions between the wet west and dry east of the South Island.The drierföhnwind descending the eastern slopes of the Southern Alps gives rise to a distinctive local weather phenomenon, theNor'west arch,visible in much ofCanterburyand parts ofOtago.

Tornadoes

Main article:List of New Zealand tornadoes

Each year, there are 7–10 damaging tornadoes that touch down in New Zealand, occurring mostly along the west coast of both islands. Tornadoes in New Zealand most often form fromsqualllines ahead ofcold fronts,which have the potential to spawnmesocyclonescapable oftornadogenesis.Tornadoes in the country are usually short-lived, narrow, and weak. However, the country'sNational Institute of Water and Atmospheric Research(NIWA) assessed the 1948 Frankton tornado as an EF3 on theEnhanced Fujita scale,making it New Zealand's strongest known tornado. The 1948 tornado was also its most impactful, with 200 buildings damaged, as well as a rare deadly tornado in the country, with three deaths.

Snowfall

Midland Lineblanketed in heavy snow

Snowfalls in New Zealand'sSouth Islandand at higher altitudes in theNorth Island.It is extremely rare at sea level in the North Island. Snow is more common inland in both main islands, though snow to sea level does occur on average once or twice per year in the central and southern South Island.

Temperature

As with many islands in the world, the influence of the ocean curtails any extremes in coastal temperature. The greater temperature ranges are found in the interior of theCanterburyandOtagoregions, and especiallyCentral Otago.Central Otago and inland Canterbury'sMackenzie Basinhave the closest New Zealand has tocontinental climates,being generally drier (due in part toföhn winds) and less directly modified by the ocean. These areas can experience summer temperatures in the low 30s °C (high 80s/low 90s °F) and snow and severe frosts in winter, the latter exacerbated byhoar frostsin the river valleys and basins.

Annual mean temperature

Meanannual temperatures range from 10 °C (50 °F) in the south to 16 °C (61 °F) in the north.The coldest month is usually July and the warmest month is usually January or February. Generally there are relatively small variations between summer and winter temperatures. An example of this is Auckland which has a variation of just 9 °C or 16 °F between the average mid-winter high temperature (14.7 °C or 58.5 °F) and average mid-summer high temperature (23.7 °C or 74.7 °F). Temperature variation throughout the day is also relatively small. The exception to this is inland areas and to the east of the ranges with daily variations that can be over 25 °C and differences of up to 14 °C between the average summer and winter high temperatures. Temperatures also drop about 0.7 °C or 1.3 °F for every 100 m (300ft) of altitude.

Northern cities such asAuckland,Whangārei,andTaurangaexperience mean yearlymaximaof between 19–20 °C (66–68 °F) and mean yearlyminimaof around 11–12 °C (52–54 °F). Eastern cities on the North Island such asGisborne,Napier,andHastingsalso have mean yearly maxima of between 19–20 °C (66–68 °F) but have slightly lower yearly mean minima of around 9–10 °C (48–50 °F). The two largest cities on the South Island,ChristchurchandDunedin,have mean yearly maxima of 17.3 °C (63.1 °F) and 14.6 °C (58.3 °F) and yearly mean minima of 7.3 °C (45.1 °F) and 7.6 °C (45.7 °F) respectively.

Summer

Daily maximum temperatures are normally in the mid to low 20s (°C) over most of the country. They are higher in northern, eastern and interior part of the country;Hastingsis the warmest city on average with 25.5 °C followed byGisbornewith 24.9 °C andNapierwith 24.5 °C. Eastern parts of the South Island are highly susceptible to thenorwester,aFohn windwhich can result in temperatures going into the high 30s and even the low 40s.RangiorainCanterburyholds the record maximum of 42.4 °C recorded in 1973, with Christchurch recording 41.6 °C in that same year. More recently,Timarureached 41.3 °C onWaitangi Dayin 2011. Due to these winds, the cooler South Island cities such asDunedin,ChristchurchandInvercargillhave higher all-time record temperatures than places further north such asWellington,AucklandandWhangārei.

Winter

August 2011 winter's snowfall inDunedin,Otago

Winter temperatures are considerably milder in New Zealand compared to other areas of similar latitude, with the exception of the Central Otago and Mackenzie Basin regions mentioned above. Maxima are generally 10–15 °C (50–59 °F) in the North Island, decreasing as one goes further south or inland. The South Island is a bit cooler, with maximum temperatures around 7–12 °C (45–54 °F), though sometimes lower. The lowest temperature ever recorded was −25.6 °C (−14.1 °F) atRanfurlyin Otago in 1903, with a more recent temperature of −21.6 °C (−6.9 °F) recorded in 1995 in nearbyOphir.

Severe weather events

See also:Category:Weather events in New Zealand

July 1863Theblizzard and flood of 1863was a series of consecutive natural disasters inCentral Otagoin New Zealand's South Island. From July to August 1863 theOtago gold fieldssuffered from a combination of floods, snowstorms, and blizzards that caused heavy loss of life among the gold miners. At least 40 died during the July rains and more than 11 in the August snows. Sources using the earliest reports of loss of life tend to greatly overstate the numbers who died.

1–6 February 1868:TheGreat storm of 1868was a violent storm that swept across much of New Zealand wrecking 12 ships and causing extensive flooding. About 40 lives were known lost and at the time an estimated £500,000 to £1 million worth of damage was caused. The storm is currently thought to have been an ex-tropical cyclone.

16 April 1897:Thestorm of 1897was a severe storm that struck the lower to central North Island of New Zealand on 16 April 1897. It caused the shipZuleikato run aground near Cape Palliser, with the loss of 12 lives, and severe flooding. At Clive the flooding caused the loss of a further 12 lives and one person was drowned near Kapiti. There were 6 further unconfirmed reports of drowning, bringing the total loss of life directly related to the storm event to between 25 and 31. Based on descriptions of the storm, particularly that of Captain Marten of theWaiapu,it may have been an ex-tropical cyclone.

2 February 1936:TheCyclone of 1936was the worst storm of the 20th century in New Zealand.

Track map of Cyclone Giselle

10 April 1968:Cyclone Gisellecaused peak gusts of 145 knots (270 km/h) near Wellington, after colliding with an Antarctic storm moving north. Giselle led to the sinking of the interisland ferryTEV Wahine,and the loss of 53 lives. Total damage caused by the storm was estimated at $14 million.

20 December 1976:Heavy rain caused widespread flooding and landslides inWellingtonCity andHutt Valley.Hutt Riverburst its stopbanksand workers inPetonetook refuge on factory roofs while rail links between Wellington city and the Hutt were suspended stranding thousands of commuters. Landslides destroyed houses and a boy was killed by a collapsing wall when a slip struck a hall inCrofton Downs.More than 350 mm of rain fell in 24 hours.

6–10 March 1988:New Zealand is hit by atropical cycloneonce every eight to nine years.Cyclone Bolawas one of the costliest cyclones in thehistory of New Zealand,causing severe damage as anextratropical cyclonewhen it passed near the country.

4 October 1997:More than 60 homes were flooded and residents inLower Huttriverside areas were evacuated during downpours. Two people died, and isolated landslips closed some Wellington roads and parts ofState Highway 1.

26 June 1998:A severe thunderstorm affectedKaroriandKelburn,with rain breaking all previous records and falling at a rate with a return period of well over 200 years. Rainfall at Kelburn totalled 69.5 mm between 7.35pm and 9.10pm.

13–27 October 1998:Gale force northwesterlies blew throughout the lowerNorth Island.On 18 October, gusts of 183 km/h were recorded atCastlepoint.Winds were most severe on the following two days, when a gust of 215 km/h was recorded on aWairarapafarm. A truck was overturned, ships ripped from their moorings in Wellington, and some houses lost their roofs.

10 January 2002:Thunderstorms over Wellington resulted in torrential rainfall, about 40 mm in 30 minutes, and flash floods in the city centre. Similar storms, some with hail and surface flooding also happened inWhanganui,Manawatu,the central and eastern North Island,BullerandNelson.The average recurrence interval of this rainfall event was estimated at more than 100 years.

14–16 February 2004:The Valentine's Day storms left hundreds of people homeless, and silt and floodwaters inundated considerable areas of farmland. Many rivers breached their banks, bridges were damaged and stock was swept away by floodwaters. A civil state of emergency was declared in Whanganui, Manawatu andRangitikei.About 500 Lower Hutt residents were evacuated because of floodwaters, and many commuters were unable to enter Wellington. The event produced galeforce southerlies, with gusts of 230 km/h in theTararua Range,and swells of 11m inCook Strait.

25 July and 14 August2011 New Zealand snowstorms:The first severe winter storm brought the coldest winter snap in fifteen years. During August snow fell consistently down to sea level in Wellington for the first time since 1976,and snowflakes even fell for a brief time inAucklandfor the first time in 80 years.

20–21 June2013 New Zealand storm:This extra-tropical system was first felt in the South Island by heavy snowfall on 18 and 19 June. Late on 20 June, the storm pushed northeast to the North Island, bringing very strong winds until early 23 June. Schools were cancelled during theshortest day(21 June), due to massive damage.

12-16 February 2023:The extratropical remnants ofCyclone Gabriellepassed over the North Island bringing heavy rain and damaging winds causing serious flooding in a number of regions. 11 people lost their lives and $13.5 billion dollars in damage was caused causing Gabrielle to become the deadliest cyclone since Giselle and overtake Bola as the costliest cyclone on record.

Statistics

By area

Auckland
Climate chart (explanation)
J F M A M J J A S O N D 75 23 15 65 24 16 94 22 15 105 20 12 103 17 10 139 15 8 146 15 7 121 15 8 116 16 9 91 18 11 93 20 12 91 22 14 █Average max. and min. temperatures in °C █Precipitation totals in mm
Imperial conversion J F M A M J J A S O N D 3 74 60 2.6 75 60 3.7 72 58 4.1 68 54 4.1 63 50 5.5 59 46 5.7 58 45 4.8 59 46 4.6 61 48 3.6 64 51 3.7 67 54 3.6 71 57 █Average max. and min. temperatures in °F █Precipitation totals in inches

Hamilton
Climate chart (explanation)
J F M A M J J A S O N D 85 24 13 71 24 13 87 23 12 95 20 9 102 17 7 119 14 5 126 14 4 117 15 5 102 16 7 96 18 8 93 20 10 95 22 12 █Average max. and min. temperatures in °C █Precipitation totals in mm
Imperial conversion J F M A M J J A S O N D 3.3 75 55 2.8 75 55 3.4 73 54 3.7 68 48 4 63 45 4.7 57 41 5 57 39 4.6 59 41 4 61 45 3.8 64 46 3.7 68 50 3.7 72 54 █Average max. and min. temperatures in °F █Precipitation totals in inches

Taupō
Climate chart (explanation)
J F M A M J J A S O N D 85 23 12 77 23 12 83 21 10 74 18 7 87 14 5 99 12 3 105 11 2 109 12 3 90 14 5 102 17 7 85 19 8 108 21 10 █Average max. and min. temperatures in °C █Precipitation totals in mm
Imperial conversion J F M A M J J A S O N D 3.3 74 53 3 74 53 3.3 70 50 2.9 64 45 3.4 57 41 3.9 53 38 4.1 52 36 4.3 54 37 3.5 57 40 4 62 44 3.3 66 47 4.3 70 50 █Average max. and min. temperatures in °F █Precipitation totals in inches

Napier
Climate chart (explanation)
J F M A M J J A S O N D 48 24 15 62 24 15 85 23 13 75 20 10 62 17 7 81 15 5 92 14 5 67 15 5 65 17 7 55 19 9 57 21 11 56 23 13 █Average max. and min. temperatures in °C █Precipitation totals in mm
Imperial conversion J F M A M J J A S O N D 1.9 76 58 2.4 75 58 3.3 73 55 3 68 50 2.4 63 45 3.2 58 41 3.6 57 40 2.6 59 41 2.6 62 45 2.2 67 49 2.2 70 52 2.2 73 56 █Average max. and min. temperatures in °F █Precipitation totals in inches

Wellington
Climate chart (explanation)
J F M A M J J A S O N D 72 20 13 62 21 14 92 19 13 100 17 11 117 14 9 147 12 7 136 11 6 123 12 7 100 14 8 115 15 9 99 17 10 86 19 12 █Average max. and min. temperatures in °C █Precipitation totals in mm
Imperial conversion J F M A M J J A S O N D 2.8 69 56 2.4 69 56 3.6 66 55 3.9 62 52 4.6 58 48 5.8 54 44 5.4 53 43 4.8 54 44 3.9 56 46 4.5 59 48 3.9 62 51 3.4 65 54 █Average max. and min. temperatures in °F █Precipitation totals in inches

Nelson
Climate chart (explanation)
J F M A M J J A S O N D 72 22 13 57 22 13 78 21 11 86 18 8 77 15 5 85 13 2 86 12 2 90 13 3 73 15 5 92 17 8 82 19 10 75 21 12 █Average max. and min. temperatures in °C █Precipitation totals in mm
Imperial conversion J F M A M J J A S O N D 2.8 72 55 2.2 72 55 3.1 69 53 3.4 65 47 3 59 41 3.3 55 36 3.4 54 35 3.5 56 38 2.9 59 42 3.6 62 46 3.2 66 50 3 69 53 █Average max. and min. temperatures in °F █Precipitation totals in inches

Hokitika
Climate chart (explanation)
J F M A M J J A S O N D 250 19 12 172 20 12 217 19 11 249 17 8 245 14 6 233 12 4 232 12 3 224 13 4 250 14 6 286 15 7 240 17 9 278 18 11 █Average max. and min. temperatures in °C █Precipitation totals in mm
Imperial conversion J F M A M J J A S O N D 9.8 67 53 6.8 68 54 8.5 66 51 9.8 62 47 9.6 58 43 9.2 54 39 9.1 54 37 8.8 55 39 9.8 57 42 11 59 45 9.4 62 48 11 65 51 █Average max. and min. temperatures in °F █Precipitation totals in inches

Christchurch
Climate chart (explanation)
J F M A M J J A S O N D 42 23 12 39 22 12 54 20 11 54 18 8 56 15 5 66 12 2 79 11 2 69 12 3 47 15 5 53 17 7 44 19 9 49 21 11 █Average max. and min. temperatures in °C █Precipitation totals in mm
Imperial conversion J F M A M J J A S O N D 1.7 73 54 1.5 72 54 2.1 69 51 2.1 64 46 2.2 58 40 2.6 53 36 3.1 52 35 2.7 54 37 1.9 59 41 2.1 63 45 1.7 67 48 1.9 70 52 █Average max. and min. temperatures in °F █Precipitation totals in inches

Alexandra
Climate chart (explanation)
J F M A M J J A S O N D 50 25 11 33 25 10 29 22 7 22 18 4 27 14 2 32 9 −2 24 8 −2 18 13 −1 21 16 2 29 19 4 31 21 7 43 23 9 █Average max. and min. temperatures in °C █Precipitation totals in mm
Imperial conversion J F M A M J J A S O N D 2 77 51 1.3 77 50 1.1 72 45 0.9 64 39 1.1 56 35 1.3 48 29 0.9 47 28 0.7 55 31 0.8 62 36 1.1 66 40 1.2 70 44 1.7 74 49 █Average max. and min. temperatures in °F █Precipitation totals in inches

Dunedin
Climate chart (explanation)
J F M A M J J A S O N D 73 19 11 59 19 11 70 18 10 62 15 8 67 13 6 68 10 4 61 10 3 55 11 4 48 13 6 64 15 7 67 16 9 76 18 10 █Average max. and min. temperatures in °C █Precipitation totals in mm
Imperial conversion J F M A M J J A S O N D 2.9 66 52 2.3 66 52 2.8 64 50 2.4 60 46 2.6 55 42 2.7 51 38 2.4 50 37 2.2 52 39 1.9 56 42 2.5 59 45 2.6 61 47 3 64 51 █Average max. and min. temperatures in °F █Precipitation totals in inches

Location	January temperature		July temperature		Annual wet-days (>1 mm)	Annual rainfall
	Mean daily maximum	Mean daily minimum	Mean daily maximum	Mean daily minimum
Kaitaia	23.6 °C (74.5 °F)	14.8 °C (58.6 °F)	15.4 °C (59.7 °F)	8.5 °C (47.3 °F)	132	1,320 mm (52.0 in)
Whangārei	24.6 °C (76.3 °F)	15.8 °C (60.4 °F)	15.5 °C (59.9 °F)	8.1 °C (46.6 °F)	131	1,289 mm (50.7 in)
Auckland	23.9 °C (75.0 °F)	16.1 °C (61.0 °F)	14.6 °C (58.3 °F)	7.7 °C (45.9 °F)	130	1,119 mm (44.1 in)
Tauranga	24.3 °C (75.7 °F)	15.3 °C (59.5 °F)	14.6 °C (58.3 °F)	6.3 °C (43.3 °F)	111	1,202 mm (47.3 in)
Hamilton	24.6 °C (76.3 °F)	12.8 °C (55.0 °F)	14.1 °C (57.4 °F)	3.8 °C (38.8 °F)	120	1,124 mm (44.3 in)
Rotorua	22.9 °C (73.2 °F)	12.6 °C (54.7 °F)	12.0 °C (53.6 °F)	3.7 °C (38.7 °F)	119	1,356 mm (53.4 in)
Gisborne	25.8 °C (78.4 °F)	14.3 °C (57.7 °F)	14.7 °C (58.5 °F)	5.5 °C (41.9 °F)	107	1,001 mm (39.4 in)
Taupō	23.0 °C (73.4 °F)	11.6 °C (52.9 °F)	11.1 °C (52.0 °F)	2.5 °C (36.5 °F)	110	948 mm (37.3 in)
New Plymouth	21.8 °C (71.2 °F)	13.4 °C (56.1 °F)	13.5 °C (56.3 °F)	5.9 °C (42.6 °F)	142	1,410 mm (55.5 in)
Napier	24.7 °C (76.5 °F)	14.7 °C (58.5 °F)	14.5 °C (58.1 °F)	4.8 °C (40.6 °F)	87	790 mm (31.1 in)
Whanganui	22.6 °C (72.7 °F)	14.1 °C (57.4 °F)	13.6 °C (56.5 °F)	5.8 °C (42.4 °F)	114	944 mm (37.2 in)
Palmerston North	22.6 °C (72.7 °F)	13.1 °C (55.6 °F)	12.9 °C (55.2 °F)	4.7 °C (40.5 °F)	122	984 mm (38.7 in)
Masterton	25.3 °C (77.5 °F)	12.1 °C (53.8 °F)	12.9 °C (55.2 °F)	3.1 °C (37.6 °F)	103	889 mm (35.0 in)
Wellington	20.3 °C (68.5 °F)	13.7 °C (56.7 °F)	11.7 °C (53.1 °F)	6.7 °C (44.1 °F)	128	1,319 mm (51.9 in)
Nelson	22.5 °C (72.5 °F)	13.7 °C (56.7 °F)	12.7 °C (54.9 °F)	2.6 °C (36.7 °F)	93	976 mm (38.4 in)
Blenheim	23.4 °C (74.1 °F)	12.9 °C (55.2 °F)	13.3 °C (55.9 °F)	2.9 °C (37.2 °F)	76	639 mm (25.2 in)
Westport	20.2 °C (68.4 °F)	12.6 °C (54.7 °F)	12.9 °C (55.2 °F)	4.9 °C (40.8 °F)	172	2,074 mm (81.7 in)
Kaikoura	20.3 °C (68.5 °F)	12.9 °C (55.2 °F)	11.2 °C (52.2 °F)	5.6 °C (42.1 °F)	84	715 mm (28.1 in)
Hokitika	19.5 °C (67.1 °F)	12.0 °C (53.6 °F)	12.0 °C (53.6 °F)	3.1 °C (37.6 °F)	172	2,921 mm (115.0 in)
Christchurch	22.5 °C (72.5 °F)	11.8 °C (53.2 °F)	11.2 °C (52.2 °F)	0.7 °C (33.3 °F)	83	618 mm (24.3 in)
Mount Cook	20.4 °C (68.7 °F)	8.7 °C (47.7 °F)	7.2 °C (45.0 °F)	−2.2 °C (28.0 °F)	156	4,132 mm (162.7 in)
Lake Tekapo	22.2 °C (72.0 °F)	8.5 °C (47.3 °F)	6.6 °C (43.9 °F)	−2.8 °C (27.0 °F)	75	535 mm (21.1 in)
Timaru	20.1 °C (68.2 °F)	11.4 °C (52.5 °F)	10.1 °C (50.2 °F)	0.6 °C (33.1 °F)	77	543 mm (21.4 in)
Milford Sound	19.5 °C (67.1 °F)	10.7 °C (51.3 °F)	9.3 °C (48.7 °F)	1.6 °C (34.9 °F)	185	6,545 mm (257.7 in)
Queenstown	22.0 °C (71.6 °F)	9.9 °C (49.8 °F)	8.6 °C (47.5 °F)	−1.4 °C (29.5 °F)	96	721 mm (28.4 in)
Alexandra	24.0 °C (75.2 °F)	10.1 °C (50.2 °F)	7.9 °C (46.2 °F)	−2.2 °C (28.0 °F)	66	365 mm (14.4 in)
Manapouri	20.7 °C (69.3 °F)	8.6 °C (47.5 °F)	8.7 °C (47.7 °F)	−0.4 °C (31.3 °F)	131	1,126 mm (44.3 in)
Dunedin	18.9 °C (66.0 °F)	11.6 °C (52.9 °F)	10.8 °C (51.4 °F)	3.0 °C (37.4 °F)	106	724 mm (28.5 in)
Invercargill	18.9 °C (66.0 °F)	9.5 °C (49.1 °F)	10.0 °C (50.0 °F)	1.1 °C (34.0 °F)	161	1,097 mm (43.2 in)
Chatham Islands	19.2 °C (66.6 °F)	12.1 °C (53.8 °F)	12.0 °C (53.6 °F)	5.6 °C (42.1 °F)	133	837 mm (33.0 in)

Records

Record	Measurement	Location	Date
Highest temperature	42.4 °C (108.3 °F)	Rangiora,Canterbury	7 February 1973
Lowest temperature	−25.6 °C (−14.1 °F)	Ranfurly,Otago	17 July 1903
Highest rainfall in an hour	134 mm (5.3 in)	Cropp River,West Coast	8 January 2004
Highest rainfall in 24 hours	758 mm (29.8 in)	Cropp River,West Coast	27–28 December 1989
Highest rainfall in a calendar year	16,617 mm (654.2 in)	Cropp River,West Coast	1998
Lowest rainfall in a calendar year	212 mm (8.3 in)	Alexandra,Otago	1964
Highest wind gust	250 km/h (160 mph)	Mount John,Canterbury	18 April 1970
Highest sunshine in a month	356 hours	New Plymouth,Taranaki	January 2015
Highest sunshine in a calendar year	2840 hours	Richmond,Tasman	2016
Lowest sunshine in a month	27 hours	Taumarunui	June 2002
Lowest sunshine in a calendar year	1333 hours	Invercargill	1983

Annual extremes

Year	Hottest	Coldest	Wettest	Driest	Windiest
2018	38.7 °C (101.7 °F) Alexandra 30 January	−10.4 °C (13.3 °F) Mount Cook Airport 3 June	9,817 mm (386.5 in) Cropp River	526 mm (20.7 in) Clyde	197 km/h (122 mph) Akitio 21 May
2019	38.4 °C (101.1 °F) Hanmer Forest 31 January	−9.2 °C (15.4 °F) Lake Tekapo 3 June	14,227 mm (560.1 in) Cropp River	417 mm (16.4 in) Clyde/Cromwell	197 km/h (122 mph) Cape Turnagain 15 May
2020	38.2 °C (100.8 °F) Gisborne 31 January	−12.3 °C (9.9 °F) Middlemarch 14 June	11,532 mm (454.0 in) Cropp River	205 mm (8.1 in) Hakataramea Valley	198 km/h (123 mph) Cape Turnagain 31 January
2021	39.4 °C (102.9 °F) Ashburton 26 January	−10.8 °C (12.6 °F) Tara Hills 27 May	14,090 mm (555 in) Cropp River	402 mm (15.8 in) Alexandra	222 km/h (138 mph) Cape Turnagain 10 September
2022	34.7 °C (94.5 °F) Lake Karapiro 3 January	−11.6 °C (11.1 °F) Mount Cook Airport 17 July	11,034 mm (434.4 in) Cropp River	368 mm (14.5 in) Roxburgh/Middlemarch	223 km/h (139 mph) Cape Turnagain 14 June
2023	35.6 °C (96.1 °F) Middlemarch 4 February	−10.6 °C (12.9 °F) Tara Hills 10 June	11,717 mm (461.3 in) Cropp River	359 mm (14.1 in) Ranfurly	246 km/h (153 mph) Cape Turnagain 17 September

Historical climate

Data collection for determining the New Zealand climate began in the late 19th century, although European explorers made valid observations of climate indicators such as glaciers and moraines early in that century. Scientific study of early New Zealand climate is quite recent and ongoing. It has settled some of the debate regarding links between theLittle Ice Age(LIA) in the Northern Hemisphere and the climate in New Zealand at the same time. The key facts to emerge are that New Zealand did experience a noticeable cooler climate, but at a slightly later date than in theNorthern Hemisphere.The onset of cooler climate was about 1450 and lasted until 1850. Indications are that temperatures were in the range of 1.5-2.0 degree Celsius lower than present during the New Zealand LIA. Since 2000 various scientific investigations looked at the behaviour of glaciers in relation to climate and found they were excellent indicators of temperatures, especially in summer. Glacial evidence of climate is matched by evidence of variations in tree ring growth and studies of ice core andocean sedimentsamples indicating the types ofmicroorganisms(some flourish in warm temperatures, other in cooler temperatures) and historicalcarbon dioxide ratios.

Evidence found that the climate was more strongly influenced by the impact of tropical air masses in warm periods and polar air masses in cool periods. Recent (2010) studies byVictoria Universityhave shown that the regional climates most affected were in coastalOtagoandSouthland.The dominant temperature influence here was the relative warmth of the sea to the south of New Zealand during theMedieval Warm Period(MWP). From about 1350 this region was notably warmer but then cooled relatively quickly from 1450. This cooling may have had a substantial impact on population in those areas. The limited historical record suggests that from 1450 the population of New Zealand underwent significant cultural change which may have links to climate cooling and dramatic changes in food supplies.

Climate change

This section is an excerpt fromClimate change in New Zealand.[edit]

Atmospheric carbon dioxide record fromBaring Head,Wellington from 1977 to present.

Climate change in New Zealandinvolves historical, current and future changes in the climate of New Zealand; and New Zealand's contribution and response to globalclimate change.Summers are becoming longer and hotter, and some glaciers have melted completely and others have shrunk. In 2021, the Ministry for the Environment estimated that New Zealand's gross emissions were 0.17% of the world's total grossgreenhouse gas emissions.However, on aper capitabasis, New Zealand is a significant emitter, the sixth highest within the Annex I countries, whereas on absolute gross emissions New Zealand is ranked as the 24th highest emitter.

Almost half New Zealand's greenhouse gas emissions are fromagriculture,mainly methane from sheep and cow belches.Between 1990 and 2021, New Zealand's gross emissions (excluding removals from land use and forestry) increased by 19%. When the uptake of carbon dioxide by forests (sequestration) is taken into account, net emissions (includingcarbon removalsfrom land use and forestry) increased by %25 since 1990.

Climate change is being responded to in a variety of ways by civil society and theNew Zealand Government.This includes participation in international treaties and in social and political debates related to climate change. New Zealand has anemissions trading scheme,and in 2019 the government introduced theClimate Change Response (Zero Carbon) Amendment Billwhich created aClimate Change Commissionresponsible for advising government on policies andemissions budgets.

New Zealand made a number of pledges onclimate change mitigationin 2019: to reduce net carbon emissions to zero by 2050, to plant 1 billion trees by 2028, and to bring pastoral agriculture (farmers) into an emissions price policy by 2025. Already in 2019, New Zealand banned new offshore oil and gas drilling and decided that climate change issues would be examined before every important decision.In early December 2020,Prime MinisterJacinda Arderndeclared a climate change emergency and pledged that the New Zealand Government would be carbon neutral by 2025. Key goals and initiatives include requiring the public sector to buy only electric or hybrid vehicles, government buildings will have to meet new "green" building standards, and all 200 coal-fired boilers in public service buildings will be phased out.

See also

• Nor'west arch
• Weather Channel (New Zealand)
• Climate change in New Zealand

Further reading

• State of the Climate 2010: A snapshot of recent climate in New Zealand(PDF),NIWA Science & Technology Series No. 56, NIWA, 2010,ISSN1173-0382,archived fromthe original(PDF)on 5 June 2011,retrieved6 August2010
• Insurance Council of New Zealand: Cost of Disaster Events in New ZealandArchived23 July 2013 at theWayback Machine

External links

• MetService(Meteorological Service of New Zealand), agovernment agencythat is the major provider of weather data
• MetVUW- a weather and climate service operated by Victoria University
  • MetVUW- forecasting
• NIWA - National Climate Centre
• NZ Weather- A New Zealand-based weather forum
  • New Zealand Weather Network (NZWN)- a live weather map of weather stations around New Zealand
• List of private weather stations
• Weather and Seasons in New Zealand