From 51.5°N: best September to October, peaking at 80° at 22:00. Circumpolar - never sets.
- JanJanuary: 36 degrees at 22:00
- FebFebruary: 26 degrees at 22:00
- MarMarch: 21 degrees at 22:00
- AprApril: 20 degrees at 22:00
- MayMay: 25 degrees at 22:00
- JunJune: 35 degrees at 22:00
- JulJuly: 47 degrees at 22:00
- AugAugust: 63 degrees at 22:00
- SepSeptember: 79 degrees at 22:00
- OctOctober: 80 degrees at 22:00
- NovNovember: 64 degrees at 22:00
- DecDecember: 49 degrees at 22:00
Altitude at 22:00 local time on the 15th of each month. Twilight, moon and weather are your problem.