NZ Weather Forum

Awhituobs wrote: ↑Tue 01/12/2020 12:03 202mm here for November. Thats a wow
and 1.2c above "average"

MetService November 2020 Summary – Boom or bust rainfall

During November, frequent lows swung across the north of the country, with short lived but heavy rain events affecting northern and eastern areas. The most notable was the extreme flooding event in Napier on the 9th, resulting in a State of Emergency being declared. A weather station in Napier City recorded in excess of 240mm across this event, while Napier Airport recorded about 150mm, despite only a 5km distance between them. This illustrates just how localised the downpours were.

November was wetter than normal across the North Island, as well as the upper South Island and in Canterbury. In stark contrast, high pressure prevailed over the south of the South Island, with a drier than usual month observed for Westland, Fiordland, Southland, and Otago.

November monthly temperatures were universally above average, with Christchurch hitting 25 degrees for the 5th day in a row on 17 November, officially putting the Garden City into a heatwave (five or more consecutive days, where the temperatures are at least five degrees above average).

The exception to the warmth was Wellington, Wairarapa and the Kaikoura Coast, which saw a cold end to the month. It was a very gloomy November in these regions, too, with Wellington recording its second cloudiest November on record by the tiniest of margins – 12 minutes – observing only 133.2 hours of bright sunshine during November. Wellington also recorded its second wettest November on record - it really was a miserable November in the Capital!

Nov 2020 Average Temps, Rainfall, Sunshine and departures from 1981-2010 normals ℅ NIWA

Site                     T-max °C      T-min °C      T-mean °C     Rain mm      Sun hrs

Auckland, Mangere       20.7  +1.3    13.8  +1.0    17.3  +1.2     97  147%    212  110%
Auckland Aero           21.1  +1.6    14.0  +1.2    17.6  +1.4    106  148%
Tauranga Aero           21.6  +1.5    12.8  +1.1    17.2  +1.3    106  143%    n/a   n/a
Hamilton Aero           20.7  +0.8    10.8  +1.3    15.7  +1.0    166  186%
Hamilton, Ruakura       21.1  +1.2    10.9  +1.0    16.0  +1.1    123  148%    176   93%
Wellington, Kelburn     16.3  -0.2    11.0  +0.7    13.6  +0.2    247  252%    133   64%
Christchurch Aero       19.3  +0.4     8.8  +0.8    14.0  +0.5     72  155%    181   81%
Dunedin, Musselburgh    17.4  +1.3     9.5  +0.9    13.5  +1.1     44   78%    223  133%
Greymouth Aero          18.2  +1.7    10.6  +1.1    14.4  +1.4    202  103%    190  114%