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Post by srfoskey on Nov 26, 2020 15:58:47 GMT -5
When is your average and record earliest/latest high below 50°F/10°C of the cold season? When would you like it to be?
For Raleigh First of fall Earliest: Oct 13, 1977 1887-2020 average: Nov 14 1981-2010 average: Nov 19
Latest: Dec 14, 2004
Last of spring Earliest: Feb 14, 1997 1981-2010 average: Mar 28
1887-2020 average: Mar 28 Latest: May 7, 1992
For Oklahoma City First of fall Earliest: Sept 26, 1926 1890-2020 average: Nov 6 1981-2010 average: Nov 8
Latest: Dec 15, 1965
Last of spring Earliest: Feb 3, 2016
1981-2010 average: Mar 26
1890-2020 average: Mar 29
Latest: May 15, 1945
Ideal (Trobin)
First of fall Earliest: Sept 18
Average: Oct 23 Latest: Nov 20
Earliest: Mar 15
Average: Apr 14
Latest: May 18
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Post by Deleted on Nov 26, 2020 17:01:33 GMT -5
For London Heathrow.
Earliest 10c: 1 January
Average first 10c: 3 March
Average last 10c: 25 November
Latest 10c: 31 December
The average first/last date is generally meaningless, as January and December both average more than 10 days above 10c.
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Post by firebird1988 on Nov 26, 2020 17:03:49 GMT -5
Our mean minimum high for the year is 10.6°C, our highs don't drop below 10°C regularly. Usually once every 3 to 4 years
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Post by Benfxmth on Nov 26, 2020 18:32:47 GMT -5
For KEWN
First of fall
Earliest: Oct 18th, 2009
Average (1981-2010): Nov 26th
Latest: Dec 25th, 2001
Last of spring
Earliest: Feb 7th, 1965
Average (1981-2010): Mar 15th
Latest: Apr 19th, 1983
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Post by Steelernation on Nov 27, 2020 2:55:58 GMT -5
First of fall:
Earliest: September 7th, 1929
Average: October 12th
Latest: November 19th, 1934
Last of spring:
Earliest: March 18th, 1963
Average: May 1st
Latest: June 14th, 1969
Averages are 1991-2020. These dates are pretty much ideal to me.
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Post by Crunch41 on Nov 28, 2020 22:18:16 GMT -5
For London Heathrow. Earliest 10c: 1 January Average first 10c: 3 March Average last 10c: 25 November Latest 10c: 31 December The average first/last date is generally meaningless, as January and December both average more than 10 days above 10c. When is the latest in the spring that a high below 10 was recorded? What about the earliest in the fall? Has London seen a high of 9 in June or September? |
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Post by Crunch41 on Nov 28, 2020 22:28:11 GMT -5
For Milwaukee, highs below 10C SpringHigh reaches 50F/10C on April 5 Last on average is May 10 (1981-2010)Last on record is June 12 1947. 48/43F, 9/6C, and 0.47"/12mm rain FallHigh drops below 50 on November 10 First on average is October 15First on record is September 17 1875. 48/39F, 9/4C and dry For Madison, a few days earlier, especially in spring.
Spring
High reaches 50F/10C on March 30
Last on average is April 28 (1981-2010)
Last on record is June 17 1876, 49/48 and dry. I don't trust this data since it averaged 73/62 for the month, normal now is 78/56. A few of the old years had diurnal ranges that are too small.
Last since then was June 12 1947. 48/43F, 9/6C, and 0.47"/12mm rain. This is exactly the same as Milwaukee...suspicious.
Fall
High drops below 50 on November 6
First on average is October 14
First on record is September 12 2014. 47/38F, 8/3C, and 0.17"/4mm rain
Earliest or latest high of 10C is not useful since 10C is possible even in the middle of winter.
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Post by Deleted on Nov 29, 2020 7:34:29 GMT -5
For London Heathrow. Earliest 10c: 1 January Average first 10c: 3 March Average last 10c: 25 November Latest 10c: 31 December The average first/last date is generally meaningless, as January and December both average more than 10 days above 10c. When is the latest in the spring that a high below 10 was recorded? What about the earliest in the fall? Has London seen a high of 9 in June or September? Latest: 28 May 2007 (7.4c) Earliest: 2 October 1974 (9.0c) |
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Post by Crunch41 on Nov 29, 2020 12:35:35 GMT -5
@b87 close but not quite. The 7.4 on May 28 was very cold for a latest ever, so a high of 9.9 on 1st June should be possible.
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Post by Deleted on Nov 29, 2020 13:24:53 GMT -5
@b87 close but not quite. The 7.4 on May 28 was very cold for a latest ever, so a high of 9.9 on 1st June should be possible. The 5 coldest June days on record at Heathrow. 1. 10.7c (3 June 1953) 2. 12.3c (11 June 1998) 3. 12.4c (6 June 1989) 4. 12.5c (7 June 1985) 5. 12.8c (4 June 1994) |
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Post by boombo on Nov 29, 2020 13:49:58 GMT -5
Average highs go above 10C in early April or thereabouts (I don't have exact data) and go below 10C around the end of October. Most winter months do still reach 10C though, the last one that didn't was January 2017. In 2010 we had to wait until 16th March to go above 10C, which is pretty extreme for us. As for the latest sub-10 in spring and the earliest in autumn, the latest was 27th June 1997 (9.3C) and the earliest a rounded 9C on 11th September 1976. We did have a high of 10.4C on 22nd August 1986 though (pretty much a year without a summer, our only subarctic year on record) so theoretically I suppose it's possible to get a single-figure high in both July and August, I'd definitely start thinking about moving if it ever happened though  |
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Post by Deleted on Nov 29, 2020 18:22:05 GMT -5
5 coldest September highs on record.
1. 10.3c (27 September 1993)
2. 10.8c (30 September 1952)
3. 11.0c (14 September 1975)
4. 11.3c (28 September 1993)
5. 11.3c (7 September 1952)
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Post by srfoskey on Nov 30, 2020 14:25:46 GMT -5
A few of the old years had diurnal ranges that are too small. I think for a while they just recorded the temperature thrice a day and the coldest recording was a low while the warmest was a high. It took a while for max/min thermometers to be put into use. |
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Post by rozenn on Nov 30, 2020 17:20:46 GMT -5
For Paris-Orly:
Avg first: Nov 1
Avg last: April 16
Record earliest first: Oct 3
Record latest first: Nov 28
Record earlist last: Mar 6
Record latest early: May 29
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Post by Deleted on Dec 1, 2020 20:50:55 GMT -5
6/12/1947 sounds like a shitty day. It's crappy when we get days like that in May. Let alone June; yuck. I do remember 9/12/2014 though - that was a Friday, and I remember temperatures taking a nosedive that preceding Wednesday afternoon (the 10th) but without any precipitation associated with it. Then the next two days were unseasonably cold. |
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Post by Morningrise on Dec 1, 2020 21:05:24 GMT -5
Unfortunately some of these statistics, like the latest high below a particular number, are very difficult to find for Canadian locations without manually going through all of the data. However this is what I was able to gather for Saskatoon:
Start of average highs at/above 10C: April 13th
End of average highs at/above 10C: October 19th
Latest daily record high at/above 10C: December 21st (1893)
Earliest daily record high at/above 10C: January 30th (1931)
Highs below 10C can happen throughout most of the year. I would say late June through mid August is probably the only time you won't see them and even then I'd bet some have slipped through as the coldest highs on record in that period. But again, I'd have to sift through all the years of data manually to do that so that's not happening.
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