Mean monthly frequency (%) of clear and overcast sky conditions (midnight to midnight observations).
61° 08'N / 146° 21' W
23.0 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 |
25
|
28
|
30
|
24
|
20
|
16
|
13
|
19
|
18
|
21
|
25
|
20
|
| Partly Cloudy |
7
|
8
|
7
|
10
|
10
|
9
|
8
|
9
|
7
|
7
|
9
|
7
|
| Cloudy |
68
|
64
|
63
|
66
|
70
|
75
|
79
|
72
|
75
|
72
|
66
|
73
|
|
Mean Cloudiness
|
0.72
|
0.69
|
0.67
|
0.72
|
0.76
|
0.80
|
0.83
|
0.77
|
0.79
|
0.76
|
0.71
|
0.77
|