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Frosts 2018
Posted: Sat 10/03/2018 07:49
by Richard
Here we go for another year
Frozen dew on the car roof this morning even though the temp bottom out at 3.4deg
Re: Frosts 2018
Posted: Sat 10/03/2018 11:49
by Simon Culling
A tweet from Metservice gives the overnight minimums for the 9th/10th March as 1.2*C at Invercargill and 1.6*C at Manapouri Airport. A figure this low at a coastal location would be noteworthy in the UK in what corresponds to our September.
Re: Frosts 2018
Posted: Sat 10/03/2018 14:34
by Richard
Nothing out of the ordinary for NZ Simon. Go back 15years and every summer saw light frosts during each of the three months, the last few summers though we've not not any
Re: Frosts 2018
Posted: Sun 11/03/2018 05:40
by Simon Culling
Thanks Richard. A similar location to Invercargill, open to cold blasts from the Arctic in this case, would be Wick Airport which is on the north coast of Scotland. Its average minimum in September is 8.5*C but the record low for the month is actually -2.0*C in a record stretching back to 1930. No date for the record, but more likely to have been recorded at the end of the month.
Re: Frosts 2018
Posted: Sat 17/03/2018 22:37
by Simon Culling
I am sorry to hog this thread, but tweets from MetService + NIWA give the lows for Saturday morning (17th March) as -0.8*C at Dunedin Airport and -1.8*C at Middlemarch. As these appear to not be unusual, when do the trees in New Zealand start to change colour in your autumn?
Re: Frosts 2018
Posted: Sun 18/03/2018 07:12
by Andy
Simon - Late March to April here in Central Otago.. but earlier if a very dry year.
Re: Frosts 2018
Posted: Sun 18/03/2018 07:40
by Richard
A bit later up this way, the further north you go the later than becomes
In spring the odd English oak tree can start to show green in late Aug which is about 6 weeks earlier than the comparable in the UK
Re: Frosts 2018
Posted: Sun 18/03/2018 07:56
by melja
Tree change well underway most parts I've seen.
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Re: Frosts 2018
Posted: Sun 18/03/2018 08:33
by NZstorm
May/June in the north.
Ginkgo and Liquidambar are best known for autumn colour in Auckland. Maples don't grow well here.
Re: Frosts 2018
Posted: Sun 18/03/2018 23:36
by Simon Culling
Thanks for the replies about autumnal colour changes. As is the UK there is a graduated change from south to north over time, although here it is the other way round. A few photos in the general thread would be great to see. Here in the UK there can be quite a range in the onset time each year depending on things such as temperature, timing and severity of frosts and whether the summer and/or autumn are wet/dry etc. but it usually starts sometime in October - so roughly April in NZ seasonal time.
Re: Frosts 2018
Posted: Mon 19/03/2018 07:01
by Richard
Also not having too much wind during autumn helps retains the leaves on the trees.
Re: Frosts 2018
Posted: Tue 27/03/2018 11:07
by Orion
Dogwood tree leaves showing reddish colour here now, some other trees showing yellow which does seem as few weeks earlier than usual.
Re: Frosts 2018
Posted: Tue 27/03/2018 14:28
by spwill
Simon Culling wrote: ↑Sun 18/03/2018 23:36
Thanks for the replies about autumnal colour changes. As is the UK there is a graduated change from south to north over time, although here it is the other way round. A few photos in the general thread would be great to see. Here in the UK there can be quite a range in the onset time each year depending on things such as temperature, timing and severity of frosts and whether the summer and/or autumn are wet/dry etc. but it usually starts sometime in October - so roughly April in NZ seasonal time.
The NZ landscape is dominated by evergreens, for a lot of NZ there is not much visual seasonal change with vegetation. Central Otago and Christchurch would be the two main places for Autumn colour/leaf drop.
Re: Frosts 2018
Posted: Sun 01/04/2018 06:29
by Richard
1.1deg this morning with a bit of ice on the car
Re: Frosts 2018
Posted: Tue 10/04/2018 21:08
by NZ Thunderstorm Soc
Could be the first frost, here for the year. Down to 1.7C with a bit of frosting on the roof of my truck.
Re: Frosts 2018
Posted: Wed 11/04/2018 17:09
by NZ Thunderstorm Soc
Slight frosting with the temperature dropping down to +0.2C.
Re: Frosts 2018
Posted: Thu 12/04/2018 20:45
by NZ Thunderstorm Soc
Frost overnight but this morning a high cloud layer moved over us, trapping in the cold air and it was only 1.7C at 8:30am, when I got up.
Temperature dipped down to minus 0.6C.
Re: Frosts 2018
Posted: Sat 14/04/2018 07:55
by Andy
Well it's been nice not to have had any hard frosts till now! -3 to -4 here this morning.
Re: Frosts 2018
Posted: Sat 14/04/2018 14:11
by NZ Thunderstorm Soc
Slight frost here this morning.
Re: Frosts 2018
Posted: Sun 15/04/2018 07:04
by Orion
White frost on lawn etc.
Air temp. currently +0.9°C
Re: Frosts 2018
Posted: Sun 15/04/2018 07:59
by Richard
Not a lot of white on the lawn here and same temp - + 0.9deg
Re: Frosts 2018
Posted: Sun 15/04/2018 12:30
by NZ Thunderstorm Soc
Ditto here, but minus 0.9C.
Re: Frosts 2018
Posted: Wed 18/04/2018 22:42
by NZ Thunderstorm Soc
I think there was a frost here this morning. Got down to minus 0.5C.
I never got up until well after 9am.
Re: Frosts 2018
Posted: Thu 19/04/2018 07:41
by kiwisk8er
Frost on the roof this morning in Tawa, and Porirua is currently sitting on 4 degrees.
Re: Frosts 2018
Posted: Mon 23/04/2018 10:34
by Richard
Down to - 2 deg this morning