From 51.5°N: best April to May, peaking at 82° at 22:00. Circumpolar - never sets.
- JanJanuary: 31 degrees at 22:00
- FebFebruary: 47 degrees at 22:00
- MarMarch: 64 degrees at 22:00
- AprApril: 82 degrees at 22:00
- MayMay: 77 degrees at 22:00
- JunJune: 58 degrees at 22:00
- JulJuly: 41 degrees at 22:00
- AugAugust: 25 degrees at 22:00
- SepSeptember: 14 degrees at 22:00
- OctOctober: 9 degrees at 22:00
- NovNovember: 10 degrees at 22:00
- DecDecember: 18 degrees at 22:00
Altitude at 22:00 local time on the 15th of each month. Twilight, moon and weather are your problem.