Mean monthly frequency (%) of clear and overcast sky conditions (sunrise to sunset observations).
70° 08'N / 143° 38' W
39.0 ft. above sea level
midnight - midnight
sunrise - sunset
Analyses are based on hourly observations for the years 1971 - 1988.
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 |
40
|
38
|
50
|
39
|
18
|
21
|
20
|
10
|
11
|
13
|
31
|
---
|
| Partly Cloudy |
12
|
12
|
11
|
12
|
8
|
10
|
13
|
9
|
8
|
9
|
9
|
---
|
| Cloudy |
48
|
50
|
39
|
49
|
74
|
69
|
67
|
80
|
81
|
78
|
60
|
---
|
|
Mean Cloudiness
|
0.56
|
0.57
|
0.46
|
0.57
|
0.79
|
0.75
|
0.75
|
0.85
|
0.85
|
0.83
|
0.66
|
---
|