Mean monthly frequency (%) of clear and overcast sky conditions (midnight to midnight observations).
60° 47'N / 161° 50' W
102.0 ft. above sea level
midnight - midnight
sunrise - sunset
Analyses are based on hourly observations for the years 1971 - 1996.
Clear skies are defined as 0 to 0.30 coverage, partly cloudy 0.40 to 0.70, and cloudy skies 0.80 to 1.00.
Mean monthly frequency (%) of clear, partly cloudy, and cloudy sky condition and mean cloudiness (fraction of sky coverage).
| Sky Condition |
Jan
|
Feb
|
Mar
|
Apr
|
May
|
Jun
|
Jul
|
Aug
|
Sep
|
Oct
|
Nov
|
Dec
|
| Clear |
35
|
44
|
39
|
32
|
19
|
12
|
10
|
10
|
14
|
22
|
28
|
27
|
| Partly Cloudy |
10
|
10
|
11
|
12
|
14
|
17
|
13
|
10
|
12
|
11
|
11
|
11
|
| Cloudy |
55
|
46
|
50
|
56
|
67
|
71
|
77
|
80
|
74
|
67
|
61
|
62
|
|
Mean Cloudiness
|
0.61
|
0.52
|
0.57
|
0.64
|
0.75
|
0.80
|
0.83
|
0.85
|
0.80
|
0.73
|
0.68
|
0.69
|