From 51.5°N: best April to May, peaking at 80° at 22:00. Circumpolar - never sets.
- JanJanuary: 20 degrees at 22:00
- FebFebruary: 36 degrees at 22:00
- MarMarch: 52 degrees at 22:00
- AprApril: 71 degrees at 22:00
- MayMay: 80 degrees at 22:00
- JunJune: 64 degrees at 22:00
- JulJuly: 46 degrees at 22:00
- AugAugust: 28 degrees at 22:00
- SepSeptember: 14 degrees at 22:00
- OctOctober: 6 degrees at 22:00
- NovNovember: 4 degrees at 22:00
- DecDecember: 9 degrees at 22:00
Altitude at 22:00 local time on the 15th of each month. Twilight, moon and weather are your problem.