Mean monthly frequency (%) of clear and overcast sky conditions (midnight to midnight observations).
66° 53'N / 162° 36' W
9.8 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 |
46
|
53
|
53
|
46
|
35
|
31
|
26
|
22
|
26
|
34
|
42
|
43
|
| Partly Cloudy |
10
|
9
|
9
|
11
|
13
|
18
|
15
|
12
|
12
|
8
|
9
|
9
|
| Cloudy |
44
|
38
|
38
|
43
|
52
|
51
|
59
|
66
|
62
|
58
|
49
|
48
|
|
Mean Cloudiness
|
0.51
|
0.44
|
0.44
|
0.50
|
0.60
|
0.61
|
0.68
|
0.73
|
0.69
|
0.53
|
0.55
|
0.54
|