[Les]

Only 2 air frosts from my site this Autumn (20th October and 7th November) even they were only slight.This is how 2011 compares with the last 4 other Autumns that my detailed data goes back.It would be interesting to see you others with records that go much further back.Just how unusual was Autumn 2011?

AUTUMN...........Air Frosts...........MEAN MIN..........LOW MINIMA
2007...............9....................4.25C.............-4.0C
2008..............18....................2.65C.............-6.5C
2009...............6....................4.00C.............-3.8C
2010..............23....................2.35C.............-7.1C
2011...............2....................6.20C.............-0.5C

This post has been edited by Les: 02 December 2011 - 00:49

[00ctober]

Just one air frost here, fell to -0.5C on Nov 7th. Not too unusual here, had completely air frost free Autumns in 2000 and 2009. Here are my stats going back to 2000.

2000 - 0
2001 - 3
2002 - 1
2003 - 5
2004 - 5
2005 - 10
2006 - 2
2007 - 4
2008 - 7
2009 - 0
2010 - 10
2011 - 1

The winter following Autumn 2009 was of course exceptionally cold with 48 air frosts recorded.

This post has been edited by 00ctober: 02 December 2011 - 01:25

[Andy Mayhew]

Only dropped to +0.1c here overnight so I'm yet to see an air frost in my garden. Previously latest date for that was 1st Dec 2009.

[Lightning Hunter]

3 air frosts here this Autumn. Previous years:

2010 = 16
2009 = 1
2008 = 8
2007 = 4
2006 = 5
2005 = 15
2004 = 6
2003 = 10
2002 = 4
2001 = 7
2000 = 9
1999 = 7
1998 = 9
1997 = 8
1996 = 13

[Ian Williams]

No air frosts here this autumn data below for St Germans S.E Cornwall. Its a common thing to have no air frosts here, out of the last 16 autumns only 6 have had air frosts.

uploads/monthly_12_2011/post-30656-0-12048300-1322817427_thumb.gif

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[Andy Mayhew]

Looking back at previous years:

2003: 9
2004: 6
2005: 12
2006: 4
2007: 5
2008: 6
2009: 0
2010: 12
2011: 0

[Dave K]

Quite a variance here over the years, maximum of 14 and plenty with no air frosts at all:

[nicko31]

Only 1 air frost here, 0.6c this morning..

[Chris Alder]

Only a couple here, but I guess the thing to take from those who have the records going back a few years is that the is no real correlation between a frost or unfrosty autumn and cold winters.

[HSEA2]

not one here so far. About half a dozen <1c nights though, and a couple at official places nearby like Cambridge. Not surprising, at its fairly exposed/breezy here.

[Andy Mayhew]

Still no air frost here - GFS and MetO forecasts suggest a risk on Saturday night, but otherwise it could be ...... 2012?

[Ian Williams]

Chris Alder, on 02 December 2011 - 14:08, said:

Only a couple here, but I guess the thing to take from those who have the records going back a few years is that the is no real correlation between a frost or unfrosty autumn and cold winters.

Totally agree, if you look at my table above 2009 saw no autumn air frosts and then we had THAT cold winter! 2005 though did follow suit with a cold autumn and coldish winter.

[Colin Ure]

2011 was my first frost free autumn in the 5 years I've been recording the weather here in Bathgate - came close with a couple of 0.2's and one 0.1 !!

2011 0
2010 20
2009 5
2008 18
2007 12

[Duncan Railton]

Not managed below 0C this autumn or winter yet, which is unusual.