Mean monthly frequency (%) of clear and overcast sky conditions (sunrise to sunset 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 |
32
|
37
|
40
|
31
|
20
|
15
|
13
|
12
|
14
|
16
|
24
|
24
|
| Partly Cloudy |
11
|
12
|
11
|
16
|
20
|
23
|
19
|
13
|
13
|
11
|
11
|
11
|
| Cloudy |
57
|
51
|
49
|
54
|
60
|
62
|
68
|
75
|
73
|
73
|
66
|
65
|
|
Mean Cloudiness
|
0.64
|
0.48
|
0.56
|
0.63
|
0.71
|
0.74
|
0.78
|
0.82
|
0.79
|
0.78
|
0.72
|
0.72
|