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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, 12:54 AM
 
Location: North West Northern Ireland.
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Quote:
Originally Posted by nei View Post
I wonder why? Is there a sudden change in air flows / masses?
Its all to do with cloud.
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Old 09-13-2013, 05:01 AM
 
Location: Near the Coast SWCT
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Quote:
Originally Posted by nei View Post
I wonder why? Is there a sudden change in air flows / masses?
I'm sure you heard of our night temps being 5-10 colder from 3 nights prior. No? Sounds like your surprised. Sharp Cold fronts can do that as shown with the graphics above from October 2008.
Sept 3rd this year my low was 63F. Sept 6th the low was 48F.
October 10, 2012 the low was 50F. October 13 the low was 28F

I didn't think it was that surprising but it could be for that area? But I tell ya... You always give me ideas for cool threads though.

Quote:
Originally Posted by Infamous92 View Post
I looked up the average first frosts for various U.S. cities and on the east coast you'd have to go down to Norfolk, VA (36N) to begin seeing first frosts later than NYC (40N), but even inland southern U.S. cities like Atlanta (33N) see first frosts before NYC. You learn something new everyday I guess.
VERY interesting stat and kinda hard to believe. I wonder if its like you said the waters keeping NYC warmer and the cold front sliding into the south that lets Atlanta get frost earlier than NYC?

Here's another good map of Average first frost in U.S. I can see NYC and Virginia being the same. Also notice most of New England gets them in September usually.



Actually, just checked. Atlanta first 36F temp is November 5. NYC is November 4. Hot spot LaGuardia is Nov 12.
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Old 09-13-2013, 05:27 AM
 
Location: Rimini, Emilia-Romagna, Italy (440 N)
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Quote:
Originally Posted by Cambium View Post
Here's another good map of Average first frost in U.S. I can see NYC and Virginia being the same. Also notice most of New England gets them in September usually.
Here we usually get the first air frost in late November, like Northern Florida! I feel "Southern".
And look at the inland Panhandle, as well as much of the Southern states, it's hard to believe that they get frosts a bit earlier than Rimini!
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Old 09-13-2013, 06:05 AM
 
Location: North West Northern Ireland.
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Surely that map can't be right. It says october for New York when people say that it is December.
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Old 09-13-2013, 06:15 AM
 
Location: Brighton, England
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Quote:
Originally Posted by Cambium View Post
I'm sure you heard of our night temps being 5-10 colder from 3 nights prior. No? Sounds like your surprised. Sharp Cold fronts can do that as shown with the graphics above from October 2008.
Sept 3rd this year my low was 63F. Sept 6th the low was 48F.
October 10, 2012 the low was 50F. October 13 the low was 28F

I didn't think it was that surprising but it could be for that area? But I tell ya... You always give me ideas for cool threads though.



VERY interesting stat and kinda hard to believe. I wonder if its like you said the waters keeping NYC warmer and the cold front sliding into the south that lets Atlanta get frost earlier than NYC?

Here's another good map of Average first frost in U.S. I can see NYC and Virginia being the same. Also notice most of New England gets them in September usually.



Actually, just checked. Atlanta first 36F temp is November 5. NYC is November 4. Hot spot LaGuardia is Nov 12.
why 36f when 32f is the freezing point? (0c)
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Old 09-13-2013, 06:17 AM
 
Location: Buxton UK
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Just to guess a random date: October 10th.
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Old 09-13-2013, 06:20 AM
 
Location: Brighton, England
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Average frost days per year in Europe... sadly I couldnt fidn any first frost maps
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Old 09-13-2013, 06:25 AM
 
Location: North West Northern Ireland.
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UK frost dates

Gb chart not uk. But anyway
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Old 09-13-2013, 07:21 AM
nei nei won $500 in our forum's Most Engaging Poster Contest - Thirteenth Edition (Jan-Feb 2015). 

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Location: Western Massachusetts
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Quote:
Originally Posted by Mac15 View Post
Surely that map can't be right. It says october for New York when people say that it is December.
It's showing November, there's green by NYC. I think Long Island should be November as well. NYC JFK had a median air frost date of November 17, east on Long Island November 8. I think Infamous92 is going by some recent years, but December sounds unrealistic.
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Old 09-13-2013, 07:22 AM
nei nei won $500 in our forum's Most Engaging Poster Contest - Thirteenth Edition (Jan-Feb 2015). 

Over $104,000 in prizes has already been given out to active posters on our forum and additional contests are planned
 
Location: Western Massachusetts
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Quote:
Originally Posted by patrix542 View Post
Average frost days per year in Europe... sadly I couldnt fidn any first frost maps
Odd how some of the UK and me are similar for first frost date. But for number of frost days/ year I have 150. Long Island with a median first frost date around Nov 10 has 96 frost days/year.
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