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View Poll Results: The first air frost. When?
September 7 12.07%
October 23 39.66%
November 14 24.14%
December 5 8.62%
January 4 6.90%
I live in a frost-free climate 5 8.62%
Voters: 58. You may not vote on this poll

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Old 09-13-2013, 01:38 PM
 
Location: Top of the South, NZ
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Quote:
Originally Posted by Mac15 View Post
It's not very frosty there.
Not this August , but as you are aware, this region gets a range from no frosts, to as many as you get, while all being right on the coast.

I would say it's your climate, that isn't particularly frosty.
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Old 09-13-2013, 01:38 PM
 
Location: Aberdeen, UK
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Quote:
Originally Posted by Mac15 View Post
Up there really? We hardly ever have to wait to November.
Yes, it's always much milder close to the coast and there is an urban warming effect as well. Inland Aboyne has already been down to -0.3C this autumn but the lowest I've had is +5.3C. Often it will plummet during the evening then a breeze will set in and it flatlines all night only dropping again near dawn.

Long term average first frost has been around 20th October but recently the milder sea temperatures have really had an effect. Here are the dates of the first frost I've recorded since 2005:

2012: 16th October
2011: 2nd December
2010: 25th October
2009: 9th November
2008: 28th October
2007: 24th November
2006: 19th November
2005: 18th November
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Old 09-13-2013, 01:44 PM
 
Location: North West Northern Ireland.
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Goodness gracious thats really late. I am shocked! My sisters always ringing to tell us it is snowing and that it is really cold. But tbh it seems yous are milder than me.

She had hardly any snow in 2010 compared to here.
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Old 09-13-2013, 01:46 PM
 
Location: Aberdeen, UK
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Quote:
Originally Posted by nei View Post
This stop on coastal BC didn't get a frost last winter:

Canadian climate at 52N has not recorded a frost yet this winter!
The island of Tiree off the west coast of Scotland, at 56N, recorded no air frost during Winter 2011/12. The first and only air frost did not occur until April.

Minima for 19th September 2011 - 30th April 2012:

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Old 09-13-2013, 01:48 PM
 
Location: Rimini, Emilia-Romagna, Italy (44°0 N)
2,673 posts, read 2,204,894 times
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Quote:
Originally Posted by dunno what to put here View Post
Has anyone on here in a maritime climate ever gone an entire winter month without a frost? Church Fenton never has - but Leeds Weather Centre didn't fall below freezing at all in Jan/Feb 1990. It fell below freezing in November, December, March and April though (89/90).

Climate in LEEDS WEATHER CTR in January 1990 - Historical weather records

Climate in LEEDS WEATHER CTR in February 1990 - Historical weather records
Mine is not a maritime climate, but a humid temperate climate with an year average of 43 frosts. The only frost-free winter months, at the airport, were February 1974 and December 2002.
In the city, Feb 1974, Feb 1977, Jan 1988, Feb 1990, Dec 1995, Dec 1997, Dec 2002, Jan 2007, Feb 2007, Jan 2013, and Feb 2013 were all surely frost-free.
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Old 09-13-2013, 01:51 PM
 
Location: Leeds, UK
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Yeah, basically anywhere with 'maritime' winters where temps usually fall below freezing a few times each month.
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Old 09-13-2013, 02:07 PM
 
Location: Paris
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Quote:
Originally Posted by dunno what to put here View Post
Has anyone on here in a maritime climate ever gone an entire winter month without a frost? Church Fenton never has - but Leeds Weather Centre didn't fall below freezing at all in Jan/Feb 1990. It fell below freezing in November, December, March and April though (89/90).
Yeah, last time was in February 1990 too in Paris-Orly, with a 0.6°C low. Ridiculously balmy average high too:
Climate in Paris-Orly in February 1990 - Historical weather records

January had some tho, including an ice day:
Climate in Paris-Orly in January 1990 - Historical weather records

No January or December has been frost free. Different from Paris-Montsouris, which is much more affected by the UHI. Last one was February 2007, with a 0.6°C low.
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Old 09-13-2013, 02:10 PM
 
Location: North West Northern Ireland.
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We had like 8 sub zero mins that Februrary.
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Old 09-13-2013, 03:13 PM
 
Location: Living on the Coast in Oxnard CA
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How cold does it have to be to get a good air frost? Around here when the ocean air moves in during the evening it can get frosty for me. I mean it can get down to 50 degrees and I am freezing. For the most part it would be in the mid 60's during the cooler months in the day time anyway. I just hate having to go back inside and put a light jacket on because of the freezing 50 degree weather.
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Old 09-13-2013, 03:27 PM
 
Location: North West Northern Ireland.
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Heya, well here it really depends on the moisture content of the air. To be quite honest with you most of the time where I live even if it is about -7c the frost is still really light. I have seen heavier frosts (whiter) at -1c than -11c. But for me in general it would probably be about -2c for a really heavy frost.

If you get a day where it is foggy and subzero all day you will get hoar frost which gives the trees and all the vegetation a hard coating of frost. But to be honest it needs to be about -3c with the ground frozen because if it is just below 0c the ground will be wet. I have had ice days where I live with a max of -0.5c and the ground was wet all day because of the fog.
Snow covers University Wind Turbine Field Coleraine | Flickr - Photo Sharing!
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