Dark-sky calendar for Progress
The long view: when the sky gets truly dark and how much moonlight you will have to work around. Cloud detail lives on each night's forecast page.
December 2026
1
Data pending
2
Data pending
3
Data pending
4
Data pending
5
Data pending
6
Data pending
7
Data pending
8
Data pending
9
Data pending
10
Data pending
11
Data pending
12
Data pending
13
Data pending
14
Data pending
15
Data pending
16
Data pending
17
Data pending
18
Data pending
19
Data pending
20
Data pending
21
Data pending
22
Data pending
23
Data pending
24
Data pending
25
Data pending
26
Data pending
27
Data pending
28
Data pending
29
Data pending
30
Data pending
31
Data pending
Moonless windows account for the Moon's position during darkness. Some high-latitude dates have twilight rather than full darkness. Calculations are prepared in the background; weather is available only within the provider's forecast horizon.
Plan around the Moon
If you want the Milky Way, aim for the week around new Moon. If you want crater detail, any clear night in the waxing half works.
Check the weather closer in
Cloud forecasts are useful for about a week. Use this calendar to pick a target date, then return to the city page two or three days out.