When can you expect the first 20c of the year? (temp, day)

[lommaren]

Late April half of the time, early May the other half.

[BMI]

Originally Posted by lommaren

Late April half of the time, early May the other half.

Almost the same here, though we can have a 20C in march, pretty rare but can happen,
even early in march.

[Botev1912]

Mean for Seattle is early April for earliest and mid October for latest. Earliest ever on Feb 8, 1963, latest ever Nov 22, 2017.

[wawa1992]

Our first and last 68+ days from 1974 to 2018.

1981-2010 average:
January 30 (first)
December 1 (last)

I suspect that since the coldest day of the winter isn't January 1, but rather around January 12, the early date should be a bit later if counting from the "dead of winter".

[Omegaraptor]

Portland, OR:

March 2/3 times, April the other third.

2017 didn't reach it until May but that year was highly unusual.

[Isleofpalms85]

Average 1st reading of 20 C or warmer in Indianapolis is just before st patrick’s day.

[B87]

Early April.

[forgotten username]

Most of the time in mid/late March. I think in February it's pretty rare, but we can be very close most years. We have recorded 16c (60F) in every month.

[Eman Resu VIII]

Early May probably, but I will do a count later from 2006 and find out.

[ABrandNewWorld]

Average January high is 20C here so usually within the first few days of the year..