When will you see your first 20C/68F minimum? (average, temp, day)

[chicagogeorge]

Originally Posted by Ariete

Like there at 60.5N? Synop report summary

Long hours daylight might help a little, but even so. That was just one. Maybe the Alaskan interior or Yukon also have seen 20C minimums.

Actually just checked Fort Yukon (66.6N) had a minimum at or above 68F/20C once in June 1967
http://www.wrcc.dri.edu/cgi-bin/cliMAIN.pl?ak3175

[overdrive1979]

It's very rare here because the altitude. I would say it happens one or two times per year if many heatwaves hits us on summer, otherwise we don't see them in heatwave-free summers.
We didn't experience them in the last summer.

[Rozenn]

The average for the first 20°C+ night is July 10 at Orly airport, so I voted July. Rather meaningless since we get only 2 of them each year on average.
Paris-Montsouris gets 5 per year and the Latin Quarter (central Paris) averages 12 per year over the 2010-2013 period (short I know).

Originally Posted by Ariete

20C yes.

I kill myself and everybody else if Brest has more tropical nights and 35C days than us in 2070. Oh, I'm dead anyway.

Brest gets 0.1 20°C+ minimums per year.

Originally Posted by ben86

I have to assume that is accurate, but in all the other hot months I've cherrypicked to have a look at I can't find anything else above 17s. I don't see how a station halfway up a hill with fields all around it can ever be 1.4C milder than the centre of Leeds the same night though when it was 2-3C colder during the day as you'd expect?

Dunno, if it's really halfway up a hill and the hill is steep enough, it can prevent radiational cooling. The town of Menton has the mildest nights of France for that reason.

Btw, that Norwegian record is insane!

[Ariete]

Originally Posted by ben86

That's higher than our national record of 23.9C, set in Brighton on the English Channel coast at nearly 51N on 3 August 1990...

Kajaani, at 64N ties the Finnish record of the 24.2C low with a marine station in Kotka.
Kuopio, at 62.5N has the record of 27.9C as the highest daily mean: http://ogimet.com/cgi-bin/gsynres?ind=02917&lang=en&decoded=yes&ndays=2&ano= 2010&mes=07&day=29&hora=20

Originally Posted by chicagogeorge

Long hours daylight might help a little, but even so. That was just one. Maybe the Alaskan interior or Yukon also have seen 20C minimums.

3, and 8 nights were above 19C.

Helsinki and Lappeenranta had 5 in July 2010: http://ogimet.com/cgi-bin/gsynres?la...=DIR&Send=Send

http://ogimet.com/cgi-bin/gsynres?la...=DIR&Send=Send

[kronan123]

here's the 1961-1990 average for no. tropical nights per year in europe.

[tarzan_taborda]

On average my hometown has 2.2 per year, the lowest for the district capitals is Viseu with 1.0 per year, and the highest Faro with 24.9 per year.

[tarzan_taborda]

Originally Posted by kronan123

here's the 1961-1990 average for no. tropical nights per year in europe.

That map is very incorrect for Portugal, only Faro averages more than 20 tropical nights per year, and the northern half of the country is all below 5 nights per year

[Candle]

Who knows. It's rare here unfortunately.

And when they do occur, it's usually preceded by 100F+ temperatures.

I'd kill for some 80F/70F days here but that never happens.

[blueherons]

I live in South Florida.

Not until December.

[dhdh]

It has happened a few times in May in Nice (2007, 2011) but the vast majority of the time 20C+ mins start in June. They're the norm in July and August, fairly common in September and not unheard of in October.

Btw, my personal threshold for a "tropical night" would be a 23.0C min. That's standard for sea-level equatorial climates (Indonesia, Malaysia, etc.) and deep (sub)tropical summers (Florida). Average mins of 25C+ are quite unusual and I'd see them happen rather in dryish/desert/semi-arid monsoonal areas (northern India, Middle East) or extremely urbanized tropical areas (southern China around Hong Kong, etc.)