Mean monthly frequency (%) of clear and overcast sky conditions (midnight to midnight observations).
64° 00'N / 145° 43' W
1267.7 ft. above sea level
midnight - midnight
sunrise - sunset
Analyses are based on hourly observations for the years 1971 - 1997.
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 |
35
|
37
|
38
|
29
|
19
|
16
|
15
|
15
|
17
|
16
|
28
|
30
|
| Partly Cloudy |
18
|
13
|
17
|
19
|
24
|
24
|
22
|
17
|
16
|
13
|
15
|
17
|
| Cloudy |
47
|
50
|
45
|
52
|
57
|
61
|
63
|
68
|
67
|
71
|
57
|
53
|
|
Mean Cloudiness
|
0.57
|
0.57
|
0.55
|
0.62
|
0.69
|
0.72
|
0.73
|
0.76
|
0.75
|
0.77
|
0.65
|
0.63
|