From 51.5°N: best February to April, peaking at 72° at 22:00. Circumpolar - never sets.
- JanJanuary: 56 degrees at 22:00
- FebFebruary: 67 degrees at 22:00
- MarMarch: 72 degrees at 22:00
- AprApril: 69 degrees at 22:00
- MayMay: 59 degrees at 22:00
- JunJune: 48 degrees at 22:00
- JulJuly: 39 degrees at 22:00
- AugAugust: 33 degrees at 22:00
- SepSeptember: 31 degrees at 22:00
- OctOctober: 32 degrees at 22:00
- NovNovember: 37 degrees at 22:00
- DecDecember: 46 degrees at 22:00
Altitude at 22:00 local time on the 15th of each month. Twilight, moon and weather are your problem.