Latest sub-10C high in the season (warmest, recorded, temperature)

[ben86]

How long do you have to wait until the risk of cool weather (maxima below 10C/50F) has passed?

Even though it's nothing that unusual to get above 10C here on New Year's Day (had 11.7C on that date this year, albeit at 11 pm and together with rain and gales) or any other date in winter for that matter, we've probably got a longer wait than almost anybody on here until every day is guaranteed to get into double figures.

The average high passes 10C at some point in early April and springs nowadays tend to be above average, but these are the dates of the last sub-10C high in the past ten years - it's actually quite a bit later than I thought it would be:

2005: 16 May
2006: 22 May
2007: 27 May
2008: 27 May
2009: 4 May
2010: 12 May
2011: 13 April
2012: 3 June *
2013: 24 May
2014: 23 May

The latest sub-10C on record was 9.3C on 26 June 1997, the earliest last sub-10C most probably the one on 13 April 2011, which was also our warmest April and warmest spring on record.

* 2012 was a very odd year - we had our earliest 20C ever, the only one we've ever had in March, and then a high of 7.5C in June, which was among the coldest summer days we've ever seen!

[B87]

The latest was 8c on 28th May 2007. Usually it's rare to see highs below 10c after mid-March though.

[MeteoFlan]

Usually late may in the Peak District. 3rd June 2012 was our latest in recent years.

[dunno what to put here]

3 June in 2012 here as well. Max was 9.8c if I recall.

[chicagogeorge]

June 11, 1903 Chicago officially had a maximum temp of 48F/9C, which is the latest sub- 50F/10C on record.


On the flip side, some early season warm weather benchmarks

March 3, 1974, when the city's official thermometer at Midway Airport peaked at 80 degrees, the city's earliest 80 on record. Similar weather conditions were in place April 10-11, 1930, when Chicago recorded its earliest 90s on record when the mercury topped out at 90 on both days. April days in the 90s are extremely rare in Chicago having occurred on only four dates since 1871. Chicago climatologist Frank Wachowski said that in addition to the back-to-back 90s in 1930, the city's only other occurrences were a pair of 91-degree highs recorded April 30, 1942, and April 22, 1980.

http://articles.chicagotribune.com/2...midway-airport

[Ariete]

3rd June in 2012 here too. AFAIK, 5 June 2009 was the last one at least in recent (1981 ->) records.

2014: 27 May
2013: 30 April
2012: 3 June
2011: 4 May
2010: 10 May
2009: 5 June
2008: 18 May
2007: 1 May
2006: 26 May
2005: 19 May
2004: 23 May
2003: 5 May
2002: 16 April
2001: 29 May
2000: 12 May

Let's put Helsinki Airport too while I'm at it

2014: 28 May
2013: 30 April
2012: 21 April
2011: 4 May
2010: 10 May
2009: 6 June
2008: 15 May
2007: 5 May
2006: 20 April
2005: 4 May
2004: 12 May
2003: 17 May
2002: 18 May
2001: 29 May
2000: 12 May

[ksolina]

For Zagreb:
2014: 4 March
2013: 7 April
2012: 12 March
2011: 19 March
2010: 12 April
2009: 25 March
2008: 25 March
2007: 22 March
2006: 18 March
2005: 11 April
2004: 10 April
2003: 7 April
2002: 11 April
2001: 14 April
2000: 20 March

[kronan123]

for the city

2014: incomplete data
2013: incomplete data
2012: 20 april
2011: 3 may
2010: 12 may
2009: 21 april
2008: 14 april
2007: 21 april
2006: 20 april
2005: 20 april

interesting that 5 out of 8 between 2005-2012 occured 20th or 21th april.

[irlinit]

May 2007 was an odd month, just a few days earlier it was 26C, and then it was 8C a few days later..

For London:

2014: 26 March
2013: 9 April
2012: 28 April
2011: 18 March
2010: 31 March
2009: 5 March
2008: 7 April
2007: 28 May
2006: 11April

[Qilin34]

30-yr avgs ending in 2010:
D.C./National: 4 Apr. Records: 6 Mar 2012 and 5 May 1917
Dulles: 8 Apr. Records: 4 Mar 2010 and 30 Apr 1964
BWI: 8 Apr. Records: 15 Mar 1910 and 7 May 1958
Pittsburgh: 21 Apr. Records: 26 Mar 1878 and 1 Jun 1910