Select Station:  



Bellingham International Airport  (1973-2000)

Download data: Daily Cloud Cover   Monthly Cloud Cover

Month
Avg. Cloud Cover
Days Clear
Days Partly Cloudy
Days Cloudy
1
6.5
4.0
4.3
22.7
2
6.2
3.8
5.2
19.5
3
6.0
4.1
7.6
19.3
4
5.9
4.1
8.9
17.1
5
5.5
4.4
11.6
15.0
6
5.4
5.0
10.5
14.5
7
4.3
9.1
11.9
10.0
8
4.5
9.6
11.5
9.9
9
4.5
8.6
10.0
11.3
10
5.9
4.6
7.8
18.6
11
6.5
3.2
4.9
21.9
12
6.4
3.5
5.9
21.6

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Bremerton National Airport  (1973-2000)

Download data: Daily Cloud Cover   Monthly Cloud Cover

Month
Avg. Cloud Cover
Days Clear
Days Partly Cloudy
Days Cloudy
1
6.4
2.5
5.5
23.1
2
6.1
2.3
7.1
19.1
3
6.1
2.7
8.5
19.8
4
5.0
2.5
10.5
17.1
5
5.9
2.8
12.9
15.3
6
4.6
3.7
12.2
14.1
7
4.6
6.3
10.6
14.1
8
3.9
6.2
12.8
12.0
9
2.8
11.6
8.5
9.9
10
5.9
5.1
9.3
16.5
11
6.7
1.3
8.1
20.6
12
6.7
2.2
6.8
22.1

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Ephrata Airport  (1973-2000)

Download data: Daily Cloud Cover   Monthly Cloud Cover

Month
Avg. Cloud Cover
Days Clear
Days Partly Cloudy
Days Cloudy
1
6.4
3.4
6.8
20.9
2
5.9
3.9
7.4
17.3
3
5.5
4.6
11.6
14.8
4
5.3
4.8
12.3
12.9
5
5.0
6.4
13.5
11.2
6
4.6
7.2
14.1
8.7
7
3.2
15.1
10.8
5.0
8
3.4
14.5
11.3
5.2
9
3.5
13.5
10.1
6.4
10
4.6
9.0
10.5
11.5
11
6.0
4.1
8.1
17.7
12
6.3
3.6
7.1
20.4

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Fairchild Air Force Base  (1971-2000)

Download data: Daily Cloud Cover   Monthly Cloud Cover

Month
Avg. Cloud Cover
Days Clear
Days Partly Cloudy
Days Cloudy
1
6.6
2.6
6.2
22.3
2
6.3
2.9
7.1
18.5
3
6.0
3.1
10.4
17.5
4
5.8
3.3
11.1
15.6
5
5.5
4.1
14.0
12.9
6
5.1
4.9
14.5
10.5
7
3.8
12.5
12.7
5.8
8
3.7
12.7
12.7
5.6
9
4.1
11.1
11.2
7.7
10
5.1
6.6
11.3
13.1
11
6.5
2.1
7.1
20.8
12
6.6
2.6
6.2
22.2

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Felts Field  (1973-2000)

Download data: Daily Cloud Cover   Monthly Cloud Cover

Month
Avg. Cloud Cover
Days Clear
Days Partly Cloudy
Days Cloudy
1
6.6
2.9
5.7
22.4
2
6.4
3.3
5.4
19.9
3
6.0
3.9
8.9
18.2
4
5.8
3.9
10.1
15.9
5
5.4
4.4
13.1
13.5
6
5.0
6.3
12.6
11.2
7
3.6
12.9
11.3
6.7
8
3.7
13.2
11.2
6.6
9
3.9
11.8
10.1
8.1
10
5.0
7.8
8.7
14.5
11
6.7
1.9
6.3
21.8
12
6.6
2.9
5.7
22.4

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Hanford  (1985-2000)

Download data: Daily Cloud Cover   Monthly Cloud Cover

Month
Avg. Cloud Cover
Days Clear
Days Partly Cloudy
Days Cloudy
1
6.5
3.2
7.3
20.5
2
6.0
4.5
6.8
17.2
3
5.3
5.5
10.9
14.6
4
5.3
5.5
11.8
12.7
5
4.8
6.9
12.8
11.2
6
4.2
9.1
13.2
7.6
7
2.8
16.8
10.2
4.0
8
2.6
17.9
9.6
3.5
9
2.5
16.1
9.3
4.6
10
4.2
10.1
11.1
9.8
11
5.8
4.8
8.3
16.8
12
6.4
4.1
5.9
21.0

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Moses Lake/Grant County Airport  (1973-2000)

Download data: Daily Cloud Cover   Monthly Cloud Cover

Month
Avg. Cloud Cover
Days Clear
Days Partly Cloudy
Days Cloudy
1
6.3
3.4
7.6
20.0
2
5.7
4.6
7.7
16.2
3
5.3
6.1
10.5
14.5
4
5.1
6.4
11.3
12.3
5
4.6
7.7
12.8
10.5
6
4.1
9.8
12.3
7.9
7
3.0
15.9
10.4
4.7
8
3.0
16.2
9.9
5.0
9
3.1
15.2
9.2
5.6
10
4.2
10.7
10.3
10.0
11
5.5
4.7
8.7
16.6
12
5.8
4.7
6.3
20.0

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Olympia Airport  (1973-2000)

Download data: Daily Cloud Cover   Monthly Cloud Cover

Month
Avg. Cloud Cover
Days Clear
Days Partly Cloudy
Days Cloudy
1
6.8
2.2
5.1
23.7
2
6.7
1.9
5.5
21.2
3
6.3
2.6
9.0
19.5
4
6.0
3.1
9.9
17.1
5
5.9
3.5
10.8
16.7
6
5.5
4.7
11.0
14.3
7
4.6
8.4
11.3
11.4
8
4.5
8.3
12.5
10.3
9
4.6
7.8
12.0
10.2
10
5.9
3.3
10.6
17.1
11
6.7
1.8
6.0
22.2
12
6.8
2.2
5.2
23.7

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Omak  (1998-2000)

Download data: Daily Cloud Cover   Monthly Cloud Cover

Month
Avg. Cloud Cover
Days Clear
Days Partly Cloudy
Days Cloudy
1
5.6
6.3
8.4
16.3
2
4.3
10.5
7.5
10.5
3
3.3
14.0
11.5
5.5
4
1.2
21.4
7.6
1.0
5
2.6
16.7
11.7
2.7
6
2.1
19.3
10.3
0.3
7
1.0
26.2
4.4
0.3
8
0.6
28.2
2.1
0.7
9
1.1
23.7
6.3
0.0
10
1.9
20.4
8.0
2.6
11
5.1
11.2
7.6
11.2
12
5.4
9.0
7.6
14.4

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Pasco  (1973-2000)

Download data: Daily Cloud Cover   Monthly Cloud Cover

Month
Avg. Cloud Cover
Days Clear
Days Partly Cloudy
Days Cloudy
1
6.4
3.1
6.2
21.6
2
6.0
3.9
7.2
17.3
3
5.2
6.9
10.1
14.0
4
4.9
6.8
11.4
11.8
5
4.5
8.5
12.7
9.8
6
3.9
11.0
12.3
6.6
7
2.5
18.4
8.7
3.9
8
2.7
18.0
8.4
4.6
9
2.7
16.6
8.5
4.8
10
4.1
11.6
9.3
10.1
11
5.9
4.2
8.0
17.8
12
6.2
4.4
5.6
21.0

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Pullman/Moscow Regional Airport  (1973-2000)

Download data: Daily Cloud Cover   Monthly Cloud Cover

Month
Avg. Cloud Cover
Days Clear
Days Partly Cloudy
Days Cloudy
1
6.4
3.5
6.4
21.1
2
5.7
4.6
7.6
16.3
3
5.4
5.5
9.0
16.5
4
5.5
4.9
10.2
14.8
5
4.8
6.2
11.5
13.3
6
4.5
8.4
11.0
10.7
7
2.7
15.7
9.7
5.6
8
2.4
16.7
9.8
4.5
9
3.0
15.6
8.1
6.3
10
4.6
9.0
9.2
12.8
11
5.9
4.3
7.0
18.7
12
6.1
4.4
6.1
20.5

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Quillayute State Airport  (1973-2000)

Download data: Daily Cloud Cover   Monthly Cloud Cover

Month
Avg. Cloud Cover
Days Clear
Days Partly Cloudy
Days Cloudy
1
6.4
4.1
5.0
22.0
2
6.3
3.9
5.3
19.3
3
6.2
3.5
8.1
19.4
4
6.1
3.6
8.1
18.3
5
6.1
3.1
10.0
18.0
6
6.1
3.3
9.1
17.6
7
5.5
5.3
11.0
14.7
8
5.2
6.1
10.9
13.9
9
4.8
8.0
10.2
11.8
10
5.7
5.1
9.6
16.3
11
6.4
3.1
6.6
20.3
12
6.4
4.2
5.7
21.0

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Seattle Boeing Field  (1973-2000)

Download data: Daily Cloud Cover   Monthly Cloud Cover

Month
Avg. Cloud Cover
Days Clear
Days Partly Cloudy
Days Cloudy
1
6.6
2.9
5.2
22.8
2
6.5
2.9
4.6
21.0
3
6.3
3.5
7.5
20.0
4
6.2
3.0
8.4
18.6
5
5.8
4.2
9.4
17.4
6
5.6
4.6
9.8
15.6
7
4.5
9.6
10.0
11.3
8
4.5
9.2
10.4
11.4
9
4.7
8.4
10.3
11.3
10
6.0
3.9
8.6
18.6
11
6.8
1.8
5.5
22.7
12
6.7
2.5
5.5
22.9

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Seattle-Tacoma International Airport  (1973-2000)

Download data: Daily Cloud Cover   Monthly Cloud Cover

Month
Avg. Cloud Cover
Days Clear
Days Partly Cloudy
Days Cloudy
1
6.6
2.7
5.6
22.7
2
6.5
2.7
5.8
20.0
3
6.3
3.0
7.9
20.1
4
6.2
2.3
10.6
17.1
5
5.8
3.8
11.0
16.2
6
5.6
4.0
11.2
14.8
7
4.6
8.8
11.6
10.6
8
4.5
7.9
13.0
10.1
9
4.7
8.2
11.5
10.3
10
6.0
3.5
10.3
17.1
11
6.7
2.0
6.1
21.9
12
6.7
2.2
5.9
22.9

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Shelton/Sanderson Field  (1998-2000)

Download data: Daily Cloud Cover   Monthly Cloud Cover

Month
Avg. Cloud Cover
Days Clear
Days Partly Cloudy
Days Cloudy
1
6.0
5.1
8.3
17.6
2
5.6
5.2
10.4
13.0
3
5.0
6.3
13.1
11.6
4
3.4
12.4
13.4
4.1
5
4.8
6.0
15.5
9.5
6
4.8
7.6
9.7
12.7
7
4.0
10.7
12.1
8.2
8
3.7
11.2
13.7
6.1
9
2.8
16.2
8.5
5.3
10
4.3
9.8
11.3
9.8
11
6.1
6.5
8.4
15.2
12
6.5
6.4
6.1
18.5

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Snohomish Co/Paine Field  (1973-2000)

Download data: Daily Cloud Cover   Monthly Cloud Cover

Month
Avg. Cloud Cover
Days Clear
Days Partly Cloudy
Days Cloudy
1
6.4
3.4
5.4
22.2
2
6.4
3.5
4.5
20.5
3
6.3
3.7
6.8
20.5
4
6.2
3.1
7.4
19.5
5
5.9
4.3
9.1
17.6
6
5.8
4.9
9.3
15.9
7
4.5
9.5
9.4
12.1
8
4.2
9.6
10.1
11.3
9
4.7
9.2
8.9
11.9
10
5.9
4.7
7.4
18.9
11
6.6
2.7
4.7
22.6
12
6.6
3.0
4.9
23.0

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Spokane International Airport  (1973-2000)

Download data: Daily Cloud Cover   Monthly Cloud Cover

Month
Avg. Cloud Cover
Days Clear
Days Partly Cloudy
Days Cloudy
1
6.7
2.5
5.7
22.8
2
6.4
2.9
5.9
19.7
3
6.0
3.7
9.7
17.7
4
5.7
3.6
11.3
15.1
5
5.3
5.1
13.3
12.7
6
4.9
5.9
13.2
10.9
7
3.6
13.2
11.6
6.2
8
3.4
12.9
12.3
5.8
9
3.8
11.8
10.4
7.8
10
5.0
7.3
10.0
13.7
11
6.6
2.4
6.5
21.1
12
6.7
2.5
5.4
23.1

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Stampede Pass  (1973-2000)

Download data: Daily Cloud Cover   Monthly Cloud Cover

Month
Avg. Cloud Cover
Days Clear
Days Partly Cloudy
Days Cloudy
1
6.8
3.5
5.1
22.4
2
6.3
3.7
5.2
19.6
3
6.2
3.8
7.2
20.1
4
6.1
4.6
6.6
18.8
5
5.6
4.9
8.2
17.9
6
5.6
5.7
8.1
16.2
7
4.5
11.3
8.9
10.7
8
3.4
12.8
9.6
8.6
9
3.9
12.5
7.4
10.2
10
5.0
7.9
7.7
15.5
11
6.8
3.3
4.8
21.9
12
6.6
3.6
5.3
22.1

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Tacoma Narrows  (1973-2000)

Download data: Daily Cloud Cover   Monthly Cloud Cover

Month
Avg. Cloud Cover
Days Clear
Days Partly Cloudy
Days Cloudy
1
6.4
2.4
5.8
22.8
2
6.1
3.1
6.4
19.1
3
6.0
3.7
7.9
19.4
4
5.9
3.2
10.1
16.8
5
5.5
4.8
10.7
15.5
6
5.4
5.7
10.3
14.0
7
4.7
9.7
10.9
10.4
8
4.2
9.2
12.3
9.5
9
4.1
9.8
11.0
9.2
10
5.9
4.0
9.9
17.1
11
6.5
2.5
6.3
21.2
12
6.6
2.4
5.8
22.9

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The Dalles Municipal Airport  (1973-2000)

Download data: Daily Cloud Cover   Monthly Cloud Cover

Month
Avg. Cloud Cover
Days Clear
Days Partly Cloudy
Days Cloudy
1
6.6
2.5
6.6
21.9
2
6.2
3.1
6.8
18.6
3
5.3
5.7
10.5
14.8
4
5.2
5.8
11.4
12.8
5
4.4
9.0
13.2
8.8
6
3.8
11.2
11.4
7.4
7
2.6
17.6
10.0
3.4
8
2.7
17.4
9.5
4.1
9
2.9
16.3
8.9
4.9
10
4.3
9.9
10.9
10.3
11
6.3
2.7
7.5
19.8
12
6.5
2.7
6.0
22.3

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Toledo-Winlock Memorial Field  (1973-2000)

Download data: Daily Cloud Cover   Monthly Cloud Cover

Month
Avg. Cloud Cover
Days Clear
Days Partly Cloudy
Days Cloudy
1
6.7
3.0
4.3
23.7
2
6.8
2.9
4.3
21.4
3
6.3
3.6
5.9
21.4
4
6.0
2.8
7.8
19.4
5
5.9
4.7
8.4
17.9
6
5.6
5.9
9.4
14.7
7
4.3
9.8
9.1
12.1
8
5.0
8.9
9.9
12.2
9
4.1
10.1
8.6
11.4
10
6.3
4.7
8.3
18.0
11
7.0
2.2
4.0
23.8
12
7.0
2.4
3.9
24.7

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Walla Walla Airport  (1973-2000)

Download data: Daily Cloud Cover   Monthly Cloud Cover

Month
Avg. Cloud Cover
Days Clear
Days Partly Cloudy
Days Cloudy
1
6.9
1.6
5.6
23.8
2
6.5
2.7
6.5
19.3
3
5.9
4.5
8.9
17.5
4
5.6
4.9
10.3
14.8
5
5.2
6.0
12.2
12.8
6
4.5
8.2
12.6
9.2
7
3.1
15.6
9.9
5.5
8
3.1
15.2
10.6
5.2
9
3.5
13.7
9.6
6.8
10
4.7
8.8
9.8
12.4
11
6.5
2.6
6.3
21.2
12
6.7
2.2
5.7
23.1

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Wenatchee/Pangborn Airport  (1973-2000)

Download data: Daily Cloud Cover   Monthly Cloud Cover

Month
Avg. Cloud Cover
Days Clear
Days Partly Cloudy
Days Cloudy
1
6.3
4.1
8.3
18.5
2
5.6
4.4
9.0
15.1
3
5.0
6.6
11.6
12.9
4
4.8
7.3
12.2
10.5
5
4.3
8.1
15.0
7.9
6
3.9
10.7
12.9
6.4
7
2.8
16.6
10.3
4.1
8
2.8
16.8
9.8
4.4
9
2.8
16.4
8.7
4.8
10
3.8
12.3
9.7
9.0
11
5.7
4.5
8.8
16.6
12
6.2
4.4
7.2
19.4

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Whidbey Island Naval Air Station  (1971-2000)

Download data: Daily Cloud Cover   Monthly Cloud Cover

Month
Avg. Cloud Cover
Days Clear
Days Partly Cloudy
Days Cloudy
1
6.4
2.8
8.0
20.2
2
6.3
2.3
8.3
17.9
3
6.1
2.0
11.2
17.8
4
6.0
2.1
11.7
16.2
5
5.8
2.3
14.2
14.5
6
5.8
2.3
14.0
13.7
7
4.9
5.6
15.4
10.0
8
4.8
5.1
16.4
9.5
9
4.8
6.4
13.7
9.9
10
5.9
2.9
11.2
16.9
11
6.5
1.8
8.6
19.6
12
6.5
1.9
8.6
20.5

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Yakima Air Terminal  (1973-2000)

Download data: Daily Cloud Cover   Monthly Cloud Cover

Month
Avg. Cloud Cover
Days Clear
Days Partly Cloudy
Days Cloudy
1
6.0
4.3
7.4
19.3
2
5.7
4.9
7.6
16.0
3
5.1
7.1
10.8
13.1
4
4.8
7.3
11.5
11.2
5
4.4
8.6
13.5
8.9
6
3.9
11.3
11.9
6.8
7
2.6
17.3
10.1
3.6
8
2.7
17.3
9.7
3.9
9
2.7
16.4
9.2
4.5
10
3.9
11.7
10.2
9.1
11
5.6
5.5
8.7
15.8
12
6.0
4.9
7.4
18.7

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Related Links

- MODIS Cloud Fraction
- Average Percent of Possible Sunshine