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Old 09-20-2013, 09:35 PM
 
Location: HERE
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Can reach 20 C at any time during the winter but in terms of reliably breaking 20 C on most days, usually starts in late April and continues through late October.
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Old 09-20-2013, 11:25 PM
B87
 
Location: Norwich, UK
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For London I think it's 30 May - 15 September.
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Old 09-21-2013, 12:41 AM
 
Location: White House, TN
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April 8th - October 26th.
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Old 09-21-2013, 03:35 AM
 
Location: Bellingham, WA
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June 2nd - September 25th.
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Old 09-21-2013, 09:52 AM
 
Location: Near Tours, France about 4710'N 025'E
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Mid-may from end of september.
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Old 09-21-2013, 09:55 AM
 
Location: Near Tours, France about 4710'N 025'E
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Second half of may to end of september.
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Old 09-23-2013, 09:52 AM
 
Location: Windsor Ontario
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Mid may is average for 20c high temps to begin.
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Old 09-23-2013, 09:58 AM
 
Location: Estonia
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Late June to early July.
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Old 09-23-2013, 02:08 PM
 
Location: Loleta, CA
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Usually mid to late April until mid to late October.
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Old 09-23-2013, 11:09 PM
 
Location: HERE
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There is one major city in the U.S. that usually gets a few 20 C + days every winter (2 or 3 20 C plus days in January are normal) yet, about half of the daytime highs in July are less than 20 C. I bet you weather geeks can figure out this one pretty quickly!
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