At what 2 moments of the year is the daily average high equal to the annual average high? (warm, averages)

[dhdh]

This is an interesting indicator of seasonal lag.

If there are several values, pick the earliest (for spring) and latest (for autumn) one.

Nice: annual average high of 19.6°C

May 9: 19.6°C
October 26: 19.6°C

Quite a seasonal lag. Temperatures are above average a month and a half after spring equinox, but still a good month after autumn equinox.

It's earlier in Paris, but I'll let Rozenn give the exact values.


In the other cities I've lived in:

Lille: April 20 - October 18 (14.5°C)
Hong Kong: April 18 - November 6 (25.6°C)
Singapore: meaningless (too little variation and too many negligible inversions in the rate of change of temperatures)

[tarzan_taborda]

I can't tell you precisely the day, but the two periods are in early may and mid october

[Donar]

early april and mid october

[Joe90]

I can't find precise dates but the average max is 18.4C.

April averages 19.1C, so I'm guessing, about the 20th, that it would go below 18.4C

October averages 18C, so I'm guessing, around the 15th, it would go past 18.4C.

[MeteoMan]

April and October.

[mar89]

April 20 - October 20

[Jakobsli]

For Trondheim, average daily high is the same as the average yearly high ca 20th April and 16th October (Værnes Airport). Seasonal lag is almost one month, about four weeks.

Oslo: About 18. April and 13. October. A little less than here, about three - four weeks seasonal lag.
Ã…lesund - Vigra (West coast): Ca May 1. and October 25. Almost 6 weeks season lag.
Tromsø in Northern Norway: Ca May 1. and October 12. Larger season lag in spring, late warm up.

In the Arctic, Bear Island (south of Svalbard): Ca May 10. and October 30. Largest season lag among these. Jan Mayen has seasonal lag almost like Bear Island.

[Infamous92]

New York: 62.9F (17.2C)

April 18 - 63.0F (17.2C)
Oct 22 - 62.9F (17.2C)

[livinlyftafullest]

Phoenix: 86.6F (30.3 C)

4/17( 86F) (30C)
10/22 86F 30C

[ksolina]

Early April and late October.