General December Weather

Weather reports, prognostics, questions and discussion. Climate diagnostics, drivers, and outlooks. Weather stations and websites.
Meangreen
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Re: General December Weather

Unread post by Meangreen »

Thunderstorm coming down the Wairau Valley towards Blenheim. Have heard a number of rumbles from it over the last half an hour.
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Re: General December Weather

Unread post by NZ Thunderstorm Soc »

Muggy day here in Lower Hutt with some interesting cloud forms towards the Remutakas this afternoon,
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Re: General December Weather

Unread post by Storm Struck »

Meri kirihimete to everyone today, eat plenty and observe the bubbling clouds :D .

There is one difference today compared to the last few days in that not only is there convergence but also a small upper trough is crossing from the west.
Back in November this is what brought more scattered thunderstorms across the plains and coast, just that extra omph to move them abit.
So I wouldn't be surprised if there were a few rumbles this afternoon.
Canterbury, home of good rugby and severe storms
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Re: General December Weather

Unread post by David »

Merry Christmas all! A fairly nice day here, partly cloudy with 26C
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Re: General December Weather

Unread post by midgrove »

Multiple lightning strikes in Marlborough with heavy showers on the radar, anvil outflow clearly visible from Blenheim
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Richard
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Re: General December Weather

Unread post by Richard »

Sun has not set and the grass has dew already, its 20deg atm with 60%, yet https://bmcnoldy.rsmas.miami.edu/Humidity.html say the dew point is 8.3, how does work :-k
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Re: General December Weather

Unread post by NZ Thunderstorm Soc »

Similar weather to yesterday but much weaker Cu forms.
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Re: General December Weather

Unread post by NZ Thunderstorm Soc »

Fine and warm day in the Lower Hutt region and into he mid 20's
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Re: General December Weather

Unread post by Nev »

Richard wrote: Sun 25/12/2022 20:51 Sun has not set and the grass has dew already, its 20deg atm with 60%, yet https://bmcnoldy.rsmas.miami.edu/Humidity.html say the dew point is 8.3, how does work :-k
Those figures look to be based on Fahrenheit, in which case you'd be talking extreme frost rather than dew... :-)
So 20.0°C at 60% RH should give you a DP of 12.0°C (or closer to 12.6°C going by NIWA's data at that time).
Still seems a little odd to have dew on the grass with those temps though?
Maybe there was some residual ground moisture coming to the surface with some evaporative cooling taking place?

P.S. Below is my favourite calculator site, which also gives you absolute humidity in terms of grams of water moisture per cubic metre of air. It also has a nice little explanation about humidity and dew points.
https://www.calculator.net/dew-point-calculator.html
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Re: General December Weather

Unread post by Razor »

Some very welcome rain here in Christchurch. Garden is bone dry, needs a good drink
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Re: General December Weather

Unread post by David »

A little residual instability here this afternoon, had 2 minutes of fat raindrops around 5.45 from a buildup
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Re: General December Weather

Unread post by dogmelon »

We're back into a stable period with no boil-ups. When is the next period?
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Re: General December Weather

Unread post by NZ Thunderstorm Soc »

Looks like a stable end of the year with main;y settled weather for the rest of the week.
Fine and sunny up in the Kapiti/Horowhenua region today.
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Re: General December Weather

Unread post by Richard »

Lovely stable day with some broken cloud which totally cleared off late afternoon, 23.5 deg the high, higher tomorrow.
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Re: General December Weather

Unread post by spwill »

It is turning into a sunny December here after a cloudy first two weeks to the month.
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Re: General December Weather

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Check out the water temp description at Bowentown.Image

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Re: General December Weather

Unread post by Orion »

Warm today, 32°C and around 33% humidity at my place. Tar melting on the streets.
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Re: General December Weather

Unread post by NZ Thunderstorm Soc »

Warm day up in the Wairarapa where we were today. Noticed tar melting on the street in Ekatahuna today.😃
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Re: General December Weather

Unread post by NZ Thunderstorm Soc »

Not as warm as yesterday up here in the Belmont Hills. The clagg moved in later this afternoon and evening with colder southerlies.
From about 30C yesterday it was about 16C for much of the day after the clagg rolled through.
I countered about 16 spit of drizzle at various times. 0_o
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Re: General December Weather

Unread post by David »

Quite a sudden arrival of the ENE/NE breeze here early this morning, temperature rose from 16C at 3am to 20.5C by dawn.
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Re: General December Weather

Unread post by NZ Thunderstorm Soc »

Fine day here in Lower Hutt but with a cool wind from off the Port Nickelodeon harbour.
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Re: General December Weather

Unread post by David »

December 2022 summary for Howick:

Mean temp: 19.2C (+0.5C)
Mean daily high: 23.8C (+0.6C)
Mean daily low: 15.3C (+0.5C)
Lowest temp: 10.4C (on day 6)
Highest temp: 26.6C (on day 28)
Total rainfall: 85mm (pretty much bang on average)
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Re: General December Weather

Unread post by Richard »

Dec for Medbury

Rainfall 61.4mm
Max temp 28.4deg, 29th
Min temp 5.7 deg, 8th and 5th
Lowest max temp 11.5 deg, 2nd
Highest min 14 deg 27th
Thunder heard on 4 days
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Re: General December Weather

Unread post by Nev »

Despite a relatively cool start, December 2022 ended up being exceptionally warm overall, rounding off what is more than likely to be NZ's warmest year on record for the second consecutive year. There was, however, a notable difference between near-record warm Dec temps for parts of the West Coast and slightly below normal Dec temps for parts of north Canterbury and Marlborough.

Dec 2022 Climate Anomaly Maps ℅ NIWA.png

Preliminary stats for the main centres:

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Dec 2022 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       23.3  +1.7    16.1  +1.3    19.7  +1.5     97  113%    234  118%
Tauranga Aero           22.8  +0.6    15.7  +1.8    19.2  +1.2    137  145%    
Hamilton Aero *         23.7  +1.5    13.6  +2.0    18.6  +1.7    104   99%    233  112%
Wellington, Kelburn     19.9  +1.3    13.5  +1.2    16.7  +1.3    100  120%    218   98%
Christchurch Aero       20.5  -0.5    11.8  +1.3    16.2  +0.4     63  135%    223  101%
Dunedin, Musselburgh    17.9  +0.6    11.4  +1.0    14.7  +0.9     30   37%    188  112%
Greymouth Aero          21.1  +2.9    12.9  +1.7    17.0  +2.3     93   37%    263  158%

* Sunshine from Ruakura 
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Re: General December Weather

Unread post by NZ Thunderstorm Soc »

December's Weather from Raukapuka, Geraldine.

Rainfall 105.6mm over 21 days
Max temp 32.3C deg, Thursday the 29th
Min temp 7.5C deg, Thursday the First
Lowest max temp 14.4C deg, Sunday the 18th
Highest min temp 15.3C deg, Tuesday the 27th
Thunder heard on 4 days

Rainfall total for the year was 1011.9mm over 170 days.
JohnGaul
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