From 51.5°N: best December to February, peaking at 37° at 22:00.
- JanJanuary: 37 degrees at 22:00
- FebFebruary: 31 degrees at 22:00
- MarMarch: 17 degrees at 22:00
- AprApril: -1 degrees at 22:00
- MayMay: -19 degrees at 22:00
- JunJune: -34 degrees at 22:00
- JulJuly: -40 degrees at 22:00
- AugAugust: -35 degrees at 22:00
- SepSeptember: -20 degrees at 22:00
- OctOctober: -2 degrees at 22:00
- NovNovember: 17 degrees at 22:00
- DecDecember: 31 degrees at 22:00
Altitude at 22:00 local time on the 15th of each month. Twilight, moon and weather are your problem.