Weiser State Forest
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Weiser State Forest clear sky chart from 2005-11-06 to 2024-01-17.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.
Observation TypeMinimum conditions for hour to be usableOut of hours
Clear of CloudsTransparencySeeingSky Brightness
Planetary:50%(no limit)Average(no limit)Nighttime Hours
Deep Sky:70%Average(no limit)5.9Nighttime Hours
CCD Imaging:70%Below AveragePoor(no limit)Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

PlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
Night
33%
23215
18%
74771
10%
23169
43%
23169
20%
48964

By Month

MonthDays of MonthPlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
January1st to 10thNight
16%
759
18%
2649
6%
757
32%
757
14%
1712
January11th to 20thNight
20%
748
16%
2492
6%
748
34%
748
14%
1736
January21st to endNight
19%
792
19%
2574
6%
792
34%
792
15%
1698
February1st to 10thNight
19%
720
15%
2340
6%
720
32%
720
14%
1630
February11th to 20thNight
12%
703
15%
2230
3%
700
29%
700
13%
1510
February21st to endNight
14%
592
20%
1776
6%
592
30%
592
14%
1234
March1st to 10thNight
21%
720
21%
2062
8%
720
36%
720
20%
1332
March11th to 20thNight
20%
720
21%
1980
8%
720
33%
720
19%
1348
March21st to endNight
21%
792
20%
2118
6%
792
31%
792
20%
1453
April1st to 10thNight
21%
720
16%
1800
3%
720
28%
720
19%
1301
April11th to 20thNight
27%
711
17%
1775
4%
711
33%
711
26%
1218
April21st to endNight
29%
720
18%
1800
5%
720
36%
720
24%
1232
May1st to 10thNight
32%
543
16%
1623
7%
543
39%
543
19%
1119
May11th to 20thNight
35%
354
17%
1416
11%
354
46%
354
16%
912
May21st to endNight
45%
388
15%
1551
15%
388
52%
388
17%
981
June1st to 10thNight
48%
360
19%
1440
18%
360
58%
360
22%
858
June11th to 20thNight
48%
360
15%
1440
14%
360
56%
360
20%
879
June21st to endNight
57%
360
17%
1440
20%
360
63%
360
25%
827
July1st to 10thNight
53%
350
14%
1400
17%
350
57%
350
19%
887
July11th to 20thNight
65%
348
17%
1392
21%
348
68%
348
25%
795
July21st to endNight
58%
533
16%
1618
13%
504
62%
504
28%
1007
August1st to 10thNight
63%
537
17%
1600
13%
534
65%
534
29%
1009
August11th to 20thNight
57%
596
16%
1660
12%
596
59%
596
24%
1145
August21st to endNight
56%
792
18%
1980
9%
792
58%
792
31%
1327
September1st to 10thNight
50%
720
22%
1800
10%
720
55%
720
31%
1217
September11th to 20thNight
55%
720
30%
1800
19%
720
60%
720
38%
1127
September21st to endNight
45%
720
23%
2050
15%
720
53%
720
26%
1344
October1st to 10thNight
42%
720
18%
2160
14%
720
49%
720
24%
1409
October11th to 20thNight
38%
720
20%
2160
14%
720
49%
720
24%
1379
October21st to endNight
30%
792
23%
2376
13%
792
43%
792
22%
1547
November1st to 10thNight
36%
740
24%
2391
14%
740
50%
740
27%
1390
November11th to 20thNight
26%
760
22%
2522
12%
760
40%
760
20%
1587
November21st to endNight
26%
760
19%
2660
10%
760
39%
760
18%
1683
December1st to 10thNight
20%
760
15%
2660
5%
760
32%
760
12%
1831
December11th to 20thNight
22%
760
16%
3218
6%
759
36%
759
12%
2079
December21st to endNight
22%
825
10%
4818
7%
817
33%
817
8%
3221

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

Occurrence of each ForecastData
Points
Cloud CoverDay
16%7%36%5%35%5%6%7%37%
74725
Night
15%7%36%5%35%5%5%7%39%
75086
TransparencyDay
44%7%12%21%14%2
74439
Night
43%7%12%22%14%2
74907
SeeingDay
23%14%27%20%11%4
13726
Night
21%13%26%28%11%1
23228

By Month

Percentage Cloud Cover NE (2006-)
Color Meanings:
Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 10thDay
13%9%46%7%45%5%5%6%36%
1517
11th to 20thDay
16%11%5%10%6%35%5%5%6%27%
1608
21st to endDay
15%10%49%7%45%5%5%5%31%
1782
February1st to 10thDay
17%10%46%6%45%5%5%6%30%
1620
11th to 20thDay
16%8%5%8%6%345%6%7%33%
1617
21st to endDay
18%10%6%7%5%34446%33%
1480
March1st to 10thDay
15%8%36%5%3445%6%42%
1894
11th to 20thDay
15%9%36%7%445%6%7%35%
1980
21st to endDay
21%8%46%5%35%445%36%
2236
April1st to 10thDay
15%8%47%6%445%5%6%37%
2160
11th to 20thDay
16%7%36%5%3445%7%40%
2134
21st to endDay
19%5%36%6%345%6%7%37%
2160
May1st to 10thDay
19%7%36%5%345%47%36%
2348
11th to 20thDay
21%7%36%5%36%5%5%7%33%
2478
21st to endDay
15%7%35%5%35%5%6%8%39%
2725
June1st to 10thDay
14%6%25%6%36%5%7%9%37%
2520
11th to 20thDay
13%6%36%6%35%5%7%8%36%
2520
21st to endDay
11%425%5%36%6%7%11%40%
2520
July1st to 10thDay
10%5%36%5%46%6%7%10%37%
2520
11th to 20thDay
8%435%5%36%6%6%10%43%
2520
21st to endDay
10%6%36%7%47%6%6%8%37%
2600
August1st to 10thDay
11%5%26%6%46%7%7%11%35%
2327
11th to 20thDay
13%6%35%6%45%5%7%9%38%
2221
21st to endDay
13%5%35%5%35%6%7%9%40%
2376
September1st to 10thDay
17%5%25%5%2445%7%44%
2160
11th to 20thDay
13%424425%46%7%49%
2160
21st to endDay
20%7%25%4345%46%40%
1905
October1st to 10thDay
18%6%15%435%45%8%41%
1800
11th to 20thDay
19%6%25%5%3446%7%40%
1800
21st to endDay
19%7%35%5%345%5%7%37%
1980
November1st to 10thDay
14%7%3442335%7%47%
1685
11th to 20thDay
18%6%35%435%5%47%40%
1654
21st to endDay
18%6%36%5%35%5%5%6%37%
1520
December1st to 10thDay
19%10%48%5%45%5%47%31%
1520
11th to 20thDay
22%9%45%43445%7%34%
1906
21st to endDay
19%11%48%7%45%5%6%6%25%
2772
January1st to 10thNight
15%9%36%5%45%45%8%36%
2649
11th to 20thNight
18%9%47%6%35%45%6%33%
2492
21st to endNight
14%7%47%6%45%5%5%7%36%
2574
February1st to 10thNight
17%9%46%6%36%5%5%6%33%
2340
11th to 20thNight
16%9%37%6%35%6%5%7%33%
2228
21st to endNight
17%9%47%6%35%446%35%
1776
March1st to 10thNight
15%7%35%43445%6%43%
2052
11th to 20thNight
18%8%36%434345%42%
1979
21st to endNight
18%8%36%5%245%5%6%37%
2118
April1st to 10thNight
17%9%37%6%35%45%7%34%
1800
11th to 20thNight
14%6%35%6%345%6%8%40%
1775
21st to endNight
18%5%36%5%3345%7%42%
1800
May1st to 10thNight
19%7%36%6%35%45%7%36%
1623
11th to 20thNight
19%5%36%435%5%5%8%37%
1415
21st to endNight
13%6%25%6%36%45%8%40%
1550
June1st to 10thNight
15%5%345%345%6%8%45%
1440
11th to 20thNight
12%6%35%5%446%6%10%39%
1440
21st to endNight
11%4245%36%6%7%9%43%
1440
July1st to 10thNight
11%6%37%5%35%5%7%8%40%
1440
11th to 20thNight
6%5%25%5%36%6%7%10%44%
1440
21st to endNight
11%5%345%45%6%7%10%41%
1713
August1st to 10thNight
11%6%25%5%35%5%7%10%42%
1611
11th to 20thNight
12%6%37%6%35%5%6%8%39%
1660
21st to endNight
11%5%35%435%5%6%9%42%
1980
September1st to 10thNight
15%5%36%5%3345%6%46%
1800
11th to 20thNight
12%43442345%7%53%
1800
21st to endNight
17%6%25%5%245%5%6%42%
2050
October1st to 10thNight
19%7%25%5%2435%6%43%
2160
11th to 20thNight
16%7%3443445%7%44%
2160
21st to endNight
19%7%25%4345%5%7%40%
2376
November1st to 10thNight
12%6%345%3345%6%50%
2391
11th to 20thNight
16%8%36%5%2445%6%42%
2522
21st to endNight
16%6%35%6%25%5%5%8%38%
2660
December1st to 10thNight
19%10%36%6%35%5%5%7%32%
2660
11th to 20thNight
18%8%37%5%45%5%5%6%36%
3288
21st to endNight
18%9%37%7%45%5%6%7%28%
4884

Transparency (when cloud cover <= 30%)
Color Meanings:
Too cloudy to forecast Poor Below Average Average Above average Transparent
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 10thDay
46%6%14%21%11%2
1518
11th to 20thDay
55%6%12%16%9%1
1608
21st to endDay
53%6%10%19%10%1
1782
February1st to 10thDay
52%7%13%18%10%1
1620
11th to 20thDay
48%6%12%22%9%2
1626
21st to endDay
53%411%19%9%4
1480
March1st to 10thDay
43%6%11%24%13%2
1897
11th to 20thDay
47%5%12%18%13%4
1980
21st to endDay
50%5%8%18%16%3
2236
April1st to 10thDay
47%6%10%19%14%4
2160
11th to 20thDay
43%6%11%21%15%4
2134
21st to endDay
44%6%11%21%14%4
2160
May1st to 10thDay
47%6%9%20%14%3
2348
11th to 20thDay
50%7%10%18%13%3
2482
21st to endDay
43%8%13%22%12%2
2725
June1st to 10thDay
42%8%12%21%15%2
2520
11th to 20thDay
43%8%13%21%12%2
2520
21st to endDay
36%9%14%26%14%1
2520
July1st to 10thDay
41%9%12%21%15%2
2450
11th to 20thDay
33%9%15%25%16%2
2445
21st to endDay
43%8%11%19%17%2
2455
August1st to 10thDay
39%11%15%22%13%
2314
11th to 20thDay
41%8%13%22%14%1
2221
21st to endDay
38%8%12%22%17%3
2376
September1st to 10thDay
40%6%12%21%17%3
2160
11th to 20thDay
34%6%11%24%22%4
2160
21st to endDay
45%6%9%18%20%2
1905
October1st to 10thDay
40%8%13%23%15%1
1800
11th to 20thDay
42%6%11%24%16%1
1800
21st to endDay
44%7%10%24%14%2
1980
November1st to 10thDay
36%5%15%23%18%3
1685
11th to 20thDay
42%5%13%22%15%3
1654
21st to endDay
44%7%12%27%8%1
1520
December1st to 10thDay
53%6%14%17%9%1
1520
11th to 20thDay
49%6%15%24%7%1
1906
21st to endDay
54%9%16%14%6%
2772
January1st to 10thNight
44%6%14%22%11%3
2649
11th to 20thNight
49%7%15%19%9%1
2492
21st to endNight
45%6%12%22%13%2
2574
February1st to 10thNight
48%7%12%22%8%1
2340
11th to 20thNight
48%5%13%18%14%2
2230
21st to endNight
49%5%10%19%14%3
1776
March1st to 10thNight
40%6%12%24%16%2
2062
11th to 20thNight
45%5%10%22%15%3
1980
21st to endNight
44%6%10%19%16%3
2118
April1st to 10thNight
48%5%11%19%14%3
1800
11th to 20thNight
40%8%11%21%18%2
1775
21st to endNight
42%5%11%20%17%4
1800
May1st to 10thNight
47%7%10%20%12%4
1623
11th to 20thNight
44%8%12%15%18%2
1416
21st to endNight
42%9%13%19%14%3
1551
June1st to 10thNight
38%8%11%22%19%1
1440
11th to 20thNight
40%8%13%21%16%2
1440
21st to endNight
35%8%15%26%15%1
1440
July1st to 10thNight
41%9%14%18%14%4
1400
11th to 20thNight
33%10%14%24%17%2
1392
21st to endNight
35%9%17%21%16%2
1618
August1st to 10thNight
36%8%15%25%15%1
1600
11th to 20thNight
42%10%12%18%17%1
1660
21st to endNight
36%9%13%20%18%3
1980
September1st to 10thNight
39%7%11%21%19%3
1800
11th to 20thNight
32%6%10%27%22%3
1800
21st to endNight
42%5%10%20%22%2
2050
October1st to 10thNight
43%5%10%24%15%2
2160
11th to 20thNight
40%6%11%27%15%2
2160
21st to endNight
41%6%11%25%15%1
2376
November1st to 10thNight
34%6%12%25%19%4
2391
11th to 20thNight
42%5%10%23%16%4
2522
21st to endNight
42%7%13%26%11%2
2660
December1st to 10thNight
50%6%13%19%12%
2660
11th to 20thNight
47%6%14%21%11%1
3288
21st to endNight
51%7%16%19%6%
4884

Seeing (when cloud cover <= 80%)
Color Meanings:
Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 10thDay
36%22%28%10%4
180
11th to 20thDay
42%19%30%8%1
227
21st to endDay
29%29%29%9%4
264
February1st to 10thDay
35%27%30%5%3
240
11th to 20thDay
36%26%32%5%
284
21st to endDay
36%20%29%13%2
346
March1st to 10thDay
34%18%28%17%4
420
11th to 20thDay
30%25%27%13%41
420
21st to endDay
30%24%24%14%5%2
462
April1st to 10thDay
29%21%28%15%5%1
420
11th to 20thDay
25%22%25%17%8%3
412
21st to endDay
29%18%34%11%5%3
420
May1st to 10thDay
31%17%28%14%7%2
423
11th to 20thDay
27%15%28%20%8%2
447
21st to endDay
20%9%27%24%15%5%
485
June1st to 10thDay
19%13%27%25%13%3
450
11th to 20thDay
20%10%28%26%13%3
450
21st to endDay
14%11%32%27%14%3
450
July1st to 10thDay
14%5%24%27%23%7%
445
11th to 20thDay
8%427%33%22%5%
444
21st to endDay
13%5%27%33%17%5%
488
August1st to 10thDay
12%6%24%28%22%8%
446
11th to 20thDay
12%5%22%33%20%8%
439
21st to endDay
14%5%28%28%13%12%
495
September1st to 10thDay
19%8%22%23%18%11%
450
11th to 20thDay
13%7%25%27%19%8%
450
21st to endDay
27%10%23%20%14%5%
450
October1st to 10thDay
24%7%23%23%17%7%
450
11th to 20thDay
22%14%29%24%10%2
450
21st to endDay
24%16%31%20%8%1
495
November1st to 10thDay
21%16%25%25%11%2
372
11th to 20thDay
29%17%28%17%9%1
314
21st to endDay
27%21%36%12%41
180
December1st to 10thDay
34%22%29%10%41
180
11th to 20thDay
37%20%33%7%3
180
21st to endDay
32%20%32%13%3
198
January1st to 10thNight
24%21%33%19%3
760
11th to 20thNight
27%16%30%23%3
748
21st to endNight
21%22%32%23%2
792
February1st to 10thNight
26%20%29%23%2
720
11th to 20thNight
27%23%33%16%1
703
21st to endNight
29%23%29%16%3
592
March1st to 10thNight
25%19%32%21%3
720
11th to 20thNight
27%18%30%19%5%1
720
21st to endNight
23%19%33%18%7%
792
April1st to 10thNight
24%20%30%20%5%
720
11th to 20thNight
19%15%35%23%7%1
711
21st to endNight
23%14%28%29%6%
720
May1st to 10thNight
25%9%27%26%12%
543
11th to 20thNight
21%6%31%32%10%
354
21st to endNight
14%8%20%40%17%1
389
June1st to 10thNight
16%5%24%35%20%
360
11th to 20thNight
16%424%40%15%1
360
21st to endNight
12%323%48%14%1
360
July1st to 10thNight
14%318%41%21%3
350
11th to 20thNight
11%213%44%28%2
348
21st to endNight
12%319%40%25%2
533
August1st to 10thNight
15%211%43%28%1
537
11th to 20thNight
15%411%36%30%4
596
21st to endNight
13%418%35%28%3
792
September1st to 10thNight
17%320%35%22%3
720
11th to 20thNight
13%5%19%34%24%5%
720
21st to endNight
20%7%20%31%20%2
720
October1st to 10thNight
23%7%20%29%19%3
720
11th to 20thNight
19%12%26%32%12%1
720
21st to endNight
24%13%27%28%8%1
792
November1st to 10thNight
16%12%30%31%11%1
740
11th to 20thNight
21%19%27%24%7%1
760
21st to endNight
22%16%30%24%7%
760
December1st to 10thNight
26%18%30%21%4
760
11th to 20thNight
22%17%31%26%3
760
21st to endNight
24%20%27%27%2
836
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