French Creek State Gamelands
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the French Creek State Gamelands clear sky chart from 2005-11-06 to 2024-01-15.

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
31%
23242
19%
74671
9%
23195
43%
23195
20%
47637

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
15%
760
22%
2649
7%
757
35%
757
15%
1625
January11th to 20thNight
19%
739
20%
2511
6%
739
37%
739
15%
1660
January21st to endNight
16%
792
22%
2574
6%
792
36%
792
18%
1613
February1st to 10thNight
14%
720
17%
2340
5%
720
29%
720
14%
1543
February11th to 20thNight
9%
703
18%
2172
2%
700
28%
700
12%
1435
February21st to endNight
13%
592
24%
1776
6%
592
33%
592
15%
1169
March1st to 10thNight
19%
720
22%
2120
7%
720
38%
720
19%
1314
March11th to 20thNight
19%
720
21%
1980
7%
720
33%
720
18%
1346
March21st to endNight
19%
792
22%
2076
7%
792
31%
792
23%
1402
April1st to 10thNight
18%
720
18%
1800
3%
720
28%
720
20%
1241
April11th to 20thNight
26%
711
19%
1775
5%
711
32%
711
25%
1209
April21st to endNight
26%
720
19%
1800
4%
720
35%
720
24%
1239
May1st to 10thNight
27%
576
15%
1656
6%
576
33%
576
18%
1163
May11th to 20thNight
33%
354
17%
1416
11%
354
43%
354
15%
921
May21st to endNight
44%
388
15%
1551
14%
388
50%
388
19%
962
June1st to 10thNight
44%
360
18%
1440
16%
360
54%
360
21%
867
June11th to 20thNight
45%
360
14%
1440
13%
360
53%
360
21%
881
June21st to endNight
53%
360
16%
1440
18%
360
60%
360
25%
822
July1st to 10thNight
52%
350
13%
1400
14%
350
57%
350
18%
902
July11th to 20thNight
59%
348
16%
1392
16%
348
64%
348
24%
785
July21st to endNight
55%
471
17%
1559
14%
445
60%
445
25%
957
August1st to 10thNight
61%
537
16%
1600
10%
534
64%
534
29%
1018
August11th to 20thNight
52%
657
15%
1721
9%
657
54%
657
27%
1178
August21st to endNight
55%
792
16%
1980
8%
792
57%
792
32%
1316
September1st to 10thNight
44%
720
22%
1800
9%
720
51%
720
31%
1215
September11th to 20thNight
54%
720
29%
1804
19%
720
58%
720
37%
1123
September21st to endNight
45%
720
23%
2016
15%
720
52%
720
26%
1320
October1st to 10thNight
38%
720
16%
2160
11%
720
46%
720
23%
1430
October11th to 20thNight
35%
720
22%
2160
14%
720
47%
720
27%
1317
October21st to endNight
28%
792
25%
2409
13%
792
44%
792
24%
1497
November1st to 10thNight
34%
740
25%
2407
13%
740
51%
740
28%
1376
November11th to 20thNight
28%
760
25%
2470
13%
760
43%
760
20%
1523
November21st to endNight
26%
760
22%
2631
9%
760
43%
760
20%
1564
December1st to 10thNight
20%
760
18%
2660
6%
760
35%
760
14%
1763
December11th to 20thNight
21%
760
19%
3198
7%
759
37%
759
13%
1969
December21st to endNight
20%
828
13%
4788
7%
817
36%
817
9%
2972

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
15%6%35%5%35%5%6%7%40%
74742
Night
15%6%35%5%345%5%7%43%
75041
TransparencyDay
41%7%12%22%15%2
74445
Night
40%7%12%22%16%3
74857
SeeingDay
23%16%28%20%10%3
13812
Night
20%15%29%26%10%1
23251

By Month

Percentage Cloud Cover SE (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
11%7%46%6%36%5%6%6%40%
1517
11th to 20thDay
15%8%26%6%36%46%7%37%
1543
21st to endDay
14%8%36%6%45%5%5%6%38%
1782
February1st to 10thDay
16%9%35%6%35%5%5%6%37%
1620
11th to 20thDay
15%8%37%5%345%5%6%38%
1674
21st to endDay
20%10%46%5%34445%37%
1480
March1st to 10thDay
13%6%36%5%345%47%45%
1836
11th to 20thDay
17%6%36%6%35%5%5%7%38%
1980
21st to endDay
21%6%26%5%34446%38%
2279
April1st to 10thDay
14%8%35%44445%7%41%
2160
11th to 20thDay
15%6%34435%45%6%43%
2134
21st to endDay
17%6%26%5%3446%8%39%
2160
May1st to 10thDay
18%7%26%6%35%6%5%7%36%
2318
11th to 20thDay
20%7%35%5%345%6%7%36%
2478
21st to endDay
14%7%25%6%35%5%6%8%40%
2725
June1st to 10thDay
14%5%25%6%35%6%7%10%38%
2520
11th to 20thDay
13%6%36%6%445%7%9%37%
2520
21st to endDay
11%5%346%35%6%6%10%42%
2520
July1st to 10thDay
10%5%35%6%47%5%7%10%38%
2520
11th to 20thDay
7%425%5%36%6%9%9%44%
2520
21st to endDay
10%6%36%5%47%7%6%8%37%
2664
August1st to 10thDay
10%5%36%6%46%6%8%7%39%
2327
11th to 20thDay
11%6%26%6%36%5%6%10%39%
2160
21st to endDay
14%5%25%6%35%5%6%8%42%
2376
September1st to 10thDay
16%5%25%5%35%5%5%7%43%
2160
11th to 20thDay
14%42442445%8%49%
2156
21st to endDay
18%6%46%5%35%446%40%
1941
October1st to 10thDay
18%6%24435%35%7%43%
1800
11th to 20thDay
16%6%15%5%3445%6%46%
1800
21st to endDay
19%6%2443345%6%43%
1945
November1st to 10thDay
13%6%25%323347%52%
1671
11th to 20thDay
17%4245%3445%6%46%
1710
21st to endDay
15%5%34435%5%5%7%44%
1544
December1st to 10thDay
18%9%26%5%3445%7%37%
1520
11th to 20thDay
20%7%35%424446%41%
1910
21st to endDay
16%7%36%7%45%6%6%6%34%
2772
January1st to 10thNight
14%6%26%5%35%45%7%43%
2649
11th to 20thNight
18%7%26%5%3445%6%39%
2511
21st to endNight
13%8%26%5%345%47%44%
2574
February1st to 10thNight
17%8%35%5%3445%7%39%
2340
11th to 20thNight
17%7%36%6%35%446%40%
2170
21st to endNight
18%7%35%425%5%5%6%40%
1776
March1st to 10thNight
14%5%25%5%3445%7%46%
2120
11th to 20thNight
17%8%25%43445%443%
1980
21st to endNight
17%7%36%424346%43%
2076
April1st to 10thNight
16%6%35%6%345%5%6%42%
1800
11th to 20thNight
14%6%36%5%345%5%7%43%
1775
21st to endNight
19%6%24434446%43%
1800
May1st to 10thNight
17%9%35%5%35%5%47%36%
1656
11th to 20thNight
18%7%35%4346%6%6%37%
1415
21st to endNight
15%6%26%43445%9%41%
1550
June1st to 10thNight
16%435%5%3445%9%42%
1440
11th to 20thNight
12%5%36%5%35%5%7%10%39%
1440
21st to endNight
10%425%5%35%5%8%10%43%
1440
July1st to 10thNight
9%5%36%7%46%5%8%9%39%
1440
11th to 20thNight
7%3246%45%6%6%11%45%
1440
21st to endNight
9%436%435%6%8%10%42%
1651
August1st to 10thNight
9%5%25%446%6%6%9%44%
1611
11th to 20thNight
12%6%36%6%36%5%6%8%39%
1721
21st to endNight
12%5%345%346%6%8%43%
1980
September1st to 10thNight
15%5%36%42445%6%47%
1800
11th to 20thNight
13%6%2332345%6%53%
1804
21st to endNight
17%5%245%345%5%6%43%
2016
October1st to 10thNight
21%6%345%23336%44%
2160
11th to 20thNight
16%6%24423446%49%
2160
21st to endNight
18%6%24333345%47%
2409
November1st to 10thNight
11%6%2442446%6%52%
2407
11th to 20thNight
16%7%25%42345%6%47%
2470
21st to endNight
13%425%5%35%5%5%7%46%
2631
December1st to 10thNight
18%7%36%5%35%447%38%
2660
11th to 20thNight
18%6%25%5%35%45%6%42%
3285
21st to endNight
17%6%36%6%345%6%7%36%
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
43%6%13%22%13%3
1518
11th to 20thDay
46%7%13%20%11%2
1543
21st to endDay
45%6%10%23%13%2
1782
February1st to 10thDay
45%7%14%22%10%2
1620
11th to 20thDay
45%6%10%25%12%2
1683
21st to endDay
50%49%22%12%3
1480
March1st to 10thDay
40%5%11%26%14%3
1836
11th to 20thDay
45%6%11%20%14%4
1980
21st to endDay
47%6%8%19%17%3
2279
April1st to 10thDay
41%7%10%21%15%5%
2160
11th to 20thDay
40%7%11%22%16%4
2134
21st to endDay
42%8%11%19%16%4
2160
May1st to 10thDay
46%8%10%18%14%4
2318
11th to 20thDay
46%7%11%20%13%2
2482
21st to endDay
42%9%14%21%13%2
2725
June1st to 10thDay
39%8%15%23%14%1
2520
11th to 20thDay
41%10%15%22%10%2
2520
21st to endDay
37%10%14%25%14%1
2520
July1st to 10thDay
40%10%13%21%14%3
2450
11th to 20thDay
32%9%17%25%14%2
2445
21st to endDay
41%10%12%21%15%2
2515
August1st to 10thDay
39%10%14%22%15%1
2314
11th to 20thDay
39%9%15%21%15%1
2160
21st to endDay
38%9%12%21%16%3
2376
September1st to 10thDay
41%8%12%19%18%3
2160
11th to 20thDay
32%6%11%25%22%4
2156
21st to endDay
46%5%9%18%20%2
1941
October1st to 10thDay
41%6%13%22%16%1
1800
11th to 20thDay
38%6%11%23%19%2
1800
21st to endDay
42%5%10%24%17%2
1945
November1st to 10thDay
34%415%25%18%4
1671
11th to 20thDay
37%6%11%24%20%2
1710
21st to endDay
38%6%14%30%10%2
1544
December1st to 10thDay
47%6%16%19%12%1
1520
11th to 20thDay
42%6%15%27%9%1
1906
21st to endDay
47%8%14%21%9%1
2772
January1st to 10thNight
41%5%12%23%16%3
2649
11th to 20thNight
45%6%14%22%11%2
2511
21st to endNight
40%5%11%25%15%3
2574
February1st to 10thNight
46%5%13%24%10%2
2340
11th to 20thNight
46%5%10%20%16%3
2172
21st to endNight
44%5%9%22%16%4
1776
March1st to 10thNight
37%6%12%25%17%3
2120
11th to 20thNight
42%7%9%22%16%4
1980
21st to endNight
43%5%10%19%18%5%
2076
April1st to 10thNight
42%6%11%20%16%4
1800
11th to 20thNight
40%6%10%21%20%3
1775
21st to endNight
41%6%10%21%17%5%
1800
May1st to 10thNight
46%9%10%16%15%3
1656
11th to 20thNight
45%9%11%14%18%3
1416
21st to endNight
40%9%15%19%15%2
1551
June1st to 10thNight
40%7%12%22%18%1
1440
11th to 20thNight
38%10%16%21%14%1
1440
21st to endNight
33%9%15%28%13%2
1440
July1st to 10thNight
40%12%14%17%14%3
1400
11th to 20thNight
31%11%17%24%15%3
1392
21st to endNight
33%12%15%23%15%2
1559
August1st to 10thNight
35%10%17%22%15%1
1600
11th to 20thNight
41%8%16%18%15%2
1721
21st to endNight
37%8%16%19%18%2
1980
September1st to 10thNight
39%7%10%21%20%3
1800
11th to 20thNight
32%6%11%21%26%4
1804
21st to endNight
40%7%9%21%22%2
2016
October1st to 10thNight
43%6%11%23%15%2
2160
11th to 20thNight
36%6%12%27%17%2
2160
21st to endNight
39%5%10%26%18%2
2409
November1st to 10thNight
32%6%12%26%19%5%
2407
11th to 20thNight
39%5%9%22%19%4
2470
21st to endNight
37%6%12%28%15%2
2631
December1st to 10thNight
47%6%12%21%13%1
2660
11th to 20thNight
42%6%12%22%15%3
3288
21st to endNight
44%8%14%23%10%1
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%23%24%13%4
180
11th to 20thDay
39%26%26%10%1
200
21st to endDay
28%31%27%9%31
264
February1st to 10thDay
33%28%30%8%2
240
11th to 20thDay
32%28%32%7%1
342
21st to endDay
36%23%28%12%1
346
March1st to 10thDay
32%19%31%15%2
420
11th to 20thDay
31%25%29%11%31
420
21st to endDay
31%25%29%10%5%1
462
April1st to 10thDay
26%25%31%13%41
420
11th to 20thDay
26%22%27%17%6%3
412
21st to endDay
30%20%32%14%41
420
May1st to 10thDay
33%17%27%15%6%2
423
11th to 20thDay
24%16%32%19%8%1
447
21st to endDay
18%11%27%25%16%2
485
June1st to 10thDay
17%13%32%23%12%2
450
11th to 20thDay
19%10%33%25%12%2
450
21st to endDay
14%11%30%27%13%4
450
July1st to 10thDay
11%7%24%32%20%7%
445
11th to 20thDay
8%5%27%33%21%5%
444
21st to endDay
11%7%32%30%16%3
488
August1st to 10thDay
11%6%28%27%22%7%
446
11th to 20thDay
13%5%23%32%20%7%
439
21st to endDay
13%6%26%29%16%9%
495
September1st to 10thDay
20%8%22%27%16%8%
450
11th to 20thDay
16%6%28%26%15%10%
450
21st to endDay
22%16%25%20%14%4
450
October1st to 10thDay
25%9%26%20%15%4
450
11th to 20thDay
20%17%28%24%11%1
450
21st to endDay
23%19%33%14%8%2
477
November1st to 10thDay
22%14%30%21%10%3
365
11th to 20thDay
23%23%29%19%6%
370
21st to endDay
24%20%34%19%21
204
December1st to 10thDay
33%23%29%10%31
180
11th to 20thDay
36%23%27%11%3
180
21st to endDay
28%24%28%14%6%1
198
January1st to 10thNight
22%25%34%16%3
760
11th to 20thNight
28%18%30%21%3
739
21st to endNight
19%23%37%18%2
792
February1st to 10thNight
26%20%34%18%1
720
11th to 20thNight
27%27%33%12%1
703
21st to endNight
28%23%33%14%2
592
March1st to 10thNight
23%24%31%20%3
720
11th to 20thNight
25%23%30%17%5%
720
21st to endNight
21%18%39%17%5%1
792
April1st to 10thNight
22%24%32%18%4
720
11th to 20thNight
19%17%35%23%6%
711
21st to endNight
23%16%31%24%6%
720
May1st to 10thNight
24%13%32%25%7%
576
11th to 20thNight
20%9%32%32%6%
354
21st to endNight
18%9%23%37%12%1
389
June1st to 10thNight
16%6%26%39%13%
360
11th to 20thNight
13%6%31%39%11%
360
21st to endNight
10%329%44%13%1
360
July1st to 10thNight
12%323%41%21%1
350
11th to 20thNight
8%421%39%26%2
348
21st to endNight
10%422%39%23%2
471
August1st to 10thNight
12%118%42%25%2
537
11th to 20thNight
16%417%37%24%2
657
21st to endNight
13%421%37%22%3
792
September1st to 10thNight
17%5%26%31%18%3
720
11th to 20thNight
15%5%20%34%23%4
720
21st to endNight
19%8%23%30%20%1
720
October1st to 10thNight
25%8%23%25%16%3
720
11th to 20thNight
20%12%30%27%12%
720
21st to endNight
25%15%29%23%9%
792
November1st to 10thNight
16%13%31%27%12%1
740
11th to 20thNight
22%18%28%24%7%1
760
21st to endNight
19%19%33%22%7%
760
December1st to 10thNight
27%18%30%18%5%1
760
11th to 20thNight
20%21%33%21%5%
760
21st to endNight
22%21%32%23%2
836
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