Mean monthly frequency (%) of clear and overcast sky conditions (midnight to midnight observations).
62° 57'N / 155° 36' W
332.9 ft. above sea level
midnight - midnight
sunrise - sunset
Analyses are based on hourly observations for the years 1971 - 1998.
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 |
34
|
41
|
43
|
34
|
21
|
15
|
13
|
13
|
17
|
21
|
26
|
27
|
| Partly Cloudy |
12
|
12
|
11
|
16
|
20
|
13
|
19
|
14
|
13
|
11
|
11
|
11
|
| Cloudy |
54
|
47
|
46
|
50
|
59
|
62
|
68
|
73
|
70
|
68
|
63
|
62
|
|
Mean Cloudiness
|
0.62
|
0.54
|
0.53
|
0.60
|
0.69
|
0.73
|
0.77
|
0.80
|
0.77
|
0.74
|
0.69
|
0.69
|