Mean monthly frequency (%) of clear and overcast sky conditions (midnight to midnight observations).
66° 55'N / 151° 31' W
641.9 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 |
48
|
49
|
50
|
38
|
31
|
21
|
19
|
18
|
23
|
27
|
40
|
39
|
| Partly Cloudy |
11
|
11
|
12
|
17
|
13
|
19
|
25
|
19
|
16
|
10
|
11
|
10
|
| Cloudy |
41
|
40
|
38
|
45
|
46
|
50
|
56
|
63
|
61
|
63
|
49
|
51
|
|
Mean Cloudiness
|
0.48
|
0.46
|
0.46
|
0.55
|
0.59
|
0.65
|
0.69
|
0.73
|
0.70
|
0.69
|
0.56
|
0.57
|