Mean monthly frequency (%) of clear and overcast sky conditions (midnight to midnight observations).
63° 53'N / 160° 48' W
15.1 ft. above sea level
midnight - midnight
sunrise - sunset
Analyses are based on hourly observations for the years 1971 - 1994.
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 |
41
|
45
|
44
|
33
|
20
|
18
|
11
|
13
|
15
|
23
|
32
|
32
|
| Partly Cloudy |
9
|
10
|
10
|
11
|
13
|
11
|
11
|
9
|
11
|
9
|
8
|
9
|
| Cloudy |
50
|
45
|
46
|
56
|
67
|
71
|
78
|
78
|
74
|
68
|
60
|
59
|
|
Mean Cloudiness
|
0.54
|
0.50
|
0.51
|
0.62
|
0.73
|
0.76
|
0.83
|
0.82
|
0.79
|
0.72
|
0.64
|
0.64
|