From 51.5°N: best December to January, peaking at 72° at 22:00.
- JanJanuary: 72 degrees at 22:00
- FebFebruary: 58 degrees at 22:00
- MarMarch: 42 degrees at 22:00
- AprApril: 23 degrees at 22:00
- MayMay: 8 degrees at 22:00
- JunJune: -2 degrees at 22:00
- JulJuly: -5 degrees at 22:00
- AugAugust: 0 degrees at 22:00
- SepSeptember: 12 degrees at 22:00
- OctOctober: 28 degrees at 22:00
- NovNovember: 47 degrees at 22:00
- DecDecember: 64 degrees at 22:00
Altitude at 22:00 local time on the 15th of each month. Twilight, moon and weather are your problem.