Sinnemahoning State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Sinnemahoning State Park clear sky chart from 2005-11-06 to 2024-03-28.

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%
23399
14%
80894
9%
23292
38%
23292
15%
57964

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
12%
757
11%
4403
4%
737
22%
737
4%
3347
January11th to 20thNight
15%
758
7%
4131
4%
740
21%
740
4%
3302
January21st to endNight
15%
832
6%
4517
5%
814
23%
814
4%
3715
February1st to 10thNight
16%
760
12%
2470
5%
760
25%
760
11%
1864
February11th to 20thNight
12%
743
11%
2405
3%
740
22%
740
9%
1781
February21st to endNight
15%
628
13%
1919
4%
628
27%
628
11%
1443
March1st to 10thNight
19%
760
17%
2104
8%
760
29%
760
15%
1537
March11th to 20thNight
21%
760
17%
2090
7%
760
29%
760
14%
1539
March21st to endNight
20%
821
17%
2246
7%
821
29%
821
16%
1621
April1st to 10thNight
22%
720
13%
1800
4%
720
27%
720
16%
1370
April11th to 20thNight
28%
711
14%
1775
5%
711
32%
711
21%
1282
April21st to endNight
30%
640
16%
1720
6%
640
36%
640
20%
1219
May1st to 10thNight
37%
540
13%
1620
8%
540
41%
540
18%
1156
May11th to 20thNight
39%
372
18%
1434
14%
372
48%
372
16%
938
May21st to endNight
47%
388
15%
1551
15%
388
53%
388
19%
955
June1st to 10thNight
51%
360
16%
1440
18%
360
58%
360
21%
870
June11th to 20thNight
51%
360
15%
1440
16%
360
57%
360
19%
899
June21st to endNight
51%
360
16%
1440
18%
360
58%
360
22%
862
July1st to 10thNight
55%
350
15%
1400
20%
350
59%
350
23%
826
July11th to 20thNight
62%
348
19%
1392
25%
348
64%
348
27%
765
July21st to endNight
58%
584
15%
1666
12%
552
62%
552
29%
1062
August1st to 10thNight
60%
537
16%
1600
12%
534
62%
534
31%
997
August11th to 20thNight
58%
534
17%
1598
13%
534
60%
534
24%
1069
August21st to endNight
53%
775
18%
1963
11%
775
55%
775
29%
1336
September1st to 10thNight
50%
720
21%
1800
11%
720
54%
720
29%
1231
September11th to 20thNight
52%
720
25%
1818
16%
720
55%
720
36%
1160
September21st to endNight
43%
720
19%
2070
16%
720
47%
720
22%
1405
October1st to 10thNight
44%
720
15%
2160
13%
720
48%
720
23%
1440
October11th to 20thNight
33%
720
14%
2160
9%
720
41%
720
19%
1475
October21st to endNight
28%
792
17%
2376
9%
792
37%
792
16%
1725
November1st to 10thNight
37%
740
21%
2342
15%
740
46%
740
22%
1484
November11th to 20thNight
24%
760
14%
2636
9%
760
32%
760
13%
1876
November21st to endNight
21%
760
13%
2660
8%
760
30%
760
12%
1939
December1st to 10thNight
15%
760
7%
2660
4%
760
18%
760
8%
2122
December11th to 20thNight
17%
760
9%
3236
4%
759
24%
759
7%
2468
December21st to endNight
17%
829
6%
4852
4%
817
25%
817
5%
3884

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
17%11%48%6%35%5%5%7%30%
78750
Night
17%11%5%8%6%3445%6%31%
81222
TransparencyDay
53%6%11%18%10%1
78466
Night
52%6%12%18%10%1
81040
SeeingDay
26%16%26%18%10%4
13825
Night
24%15%24%25%11%1
23416

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
15%20%10%9%5%23335%22%
2517
11th to 20thDay
11%18%9%18%8%34335%18%
2790
21st to endDay
23%17%10%10%7%3433417%
3124
February1st to 10thDay
16%15%6%10%8%46%44422%
1710
11th to 20thDay
14%13%8%11%7%35%45%6%25%
1663
21st to endDay
20%12%5%10%7%23345%28%
1533
March1st to 10thDay
17%11%5%8%6%34346%31%
2072
11th to 20thDay
17%13%6%8%7%34347%29%
2090
21st to endDay
20%11%48%6%25%44432%
2263
April1st to 10thDay
17%13%5%8%5%34446%32%
2160
11th to 20thDay
18%11%47%5%345%5%5%34%
2134
21st to endDay
22%9%46%5%34346%34%
2256
May1st to 10thDay
20%9%37%6%35%5%5%7%30%
2340
11th to 20thDay
22%8%36%6%35%5%47%30%
2457
21st to endDay
15%6%25%5%45%6%6%8%37%
2725
June1st to 10thDay
16%7%37%6%46%46%7%34%
2520
11th to 20thDay
15%7%37%7%45%5%5%9%34%
2520
21st to endDay
14%6%25%6%46%6%7%9%36%
2520
July1st to 10thDay
11%7%37%6%46%6%6%8%37%
2520
11th to 20thDay
12%6%36%7%46%6%6%10%34%
2520
21st to endDay
11%7%36%6%46%7%6%8%35%
2549
August1st to 10thDay
11%7%36%7%47%7%6%9%33%
2327
11th to 20thDay
14%7%37%6%46%6%7%7%32%
2301
21st to endDay
15%7%26%6%46%6%6%8%33%
2376
September1st to 10thDay
19%7%35%5%3445%5%39%
2160
11th to 20thDay
15%7%25%5%2445%6%43%
2139
21st to endDay
20%7%25%5%45%447%35%
1890
October1st to 10thDay
17%10%36%5%3446%9%34%
1800
11th to 20thDay
21%9%36%6%3445%5%32%
1800
21st to endDay
22%11%46%5%445%5%6%28%
1980
November1st to 10thDay
14%7%47%5%35%46%6%38%
1735
11th to 20thDay
18%14%48%6%2446%6%27%
1541
21st to endDay
19%16%48%5%4445%6%24%
1520
December1st to 10thDay
19%19%8%9%7%45%435%17%
1520
11th to 20thDay
20%16%7%9%5%35%45%6%21%
1906
21st to endDay
25%19%7%9%7%33345%15%
2772
January1st to 10thNight
17%18%7%10%6%35%446%20%
4429
11th to 20thNight
15%17%8%14%8%3445%5%17%
4152
21st to endNight
25%16%6%12%7%3433417%
4532
February1st to 10thNight
15%14%7%9%7%35%45%5%25%
2470
11th to 20thNight
16%11%6%9%7%45%5%5%7%24%
2403
21st to endNight
19%12%5%11%6%35%436%27%
1919
March1st to 10thNight
16%10%47%7%45%5%5%7%30%
2094
11th to 20thNight
17%13%48%6%3435%6%31%
2089
21st to endNight
17%12%46%6%34346%34%
2246
April1st to 10thNight
19%11%5%7%7%34446%30%
1800
11th to 20thNight
18%9%36%6%3445%7%36%
1775
21st to endNight
18%8%47%5%345%5%7%35%
1720
May1st to 10thNight
20%9%36%6%35%445%35%
1620
11th to 20thNight
17%7%36%6%35%5%5%6%38%
1433
21st to endNight
13%6%36%6%45%5%6%8%40%
1550
June1st to 10thNight
13%6%35%5%345%6%8%42%
1440
11th to 20thNight
12%7%35%5%35%6%6%9%39%
1440
21st to endNight
13%5%35%5%35%5%5%11%41%
1440
July1st to 10thNight
13%5%35%5%35%5%5%7%46%
1440
11th to 20thNight
9%5%35%425%5%6%9%47%
1440
21st to endNight
11%5%26%5%35%5%7%10%40%
1764
August1st to 10thNight
9%5%25%6%35%6%6%8%45%
1611
11th to 20thNight
14%7%26%6%345%6%7%40%
1598
21st to endNight
12%6%36%6%35%5%6%7%42%
1963
September1st to 10thNight
17%6%345%44347%45%
1800
11th to 20thNight
14%6%25%433347%49%
1818
21st to endNight
18%7%36%5%34446%39%
2070
October1st to 10thNight
18%7%26%5%3345%7%40%
2160
11th to 20thNight
20%9%25%5%35%45%7%35%
2160
21st to endNight
24%10%36%433447%30%
2376
November1st to 10thNight
12%9%35%5%34446%43%
2342
11th to 20thNight
18%12%5%7%6%45%45%7%28%
2636
21st to endNight
17%13%6%9%6%345%5%7%25%
2660
December1st to 10thNight
20%16%7%9%7%35%5%6%5%18%
2660
11th to 20thNight
18%14%6%10%7%45%446%23%
3288
21st to endNight
24%16%7%9%6%3445%6%16%
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
65%412%13%42
2518
11th to 20thDay
70%48%12%5%
2790
21st to endDay
73%5%7%11%41
3124
February1st to 10thDay
65%5%10%13%6%
1710
11th to 20thDay
59%410%19%8%
1672
21st to endDay
59%49%19%7%2
1533
March1st to 10thDay
54%410%22%9%1
2075
11th to 20thDay
56%5%9%18%9%3
2090
21st to endDay
56%48%18%12%2
2263
April1st to 10thDay
53%5%10%19%11%2
2160
11th to 20thDay
51%6%10%17%14%2
2134
21st to endDay
52%6%8%19%13%2
2256
May1st to 10thDay
53%6%10%18%11%2
2340
11th to 20thDay
53%7%9%17%11%2
2461
21st to endDay
44%9%15%21%10%2
2725
June1st to 10thDay
47%8%11%19%12%1
2520
11th to 20thDay
47%8%13%19%12%1
2520
21st to endDay
42%8%14%25%11%
2520
July1st to 10thDay
44%8%12%22%13%1
2450
11th to 20thDay
42%9%14%21%14%
2445
21st to endDay
42%9%12%21%13%1
2406
August1st to 10thDay
44%10%13%23%10%
2314
11th to 20thDay
47%9%14%19%9%1
2301
21st to endDay
46%8%12%19%13%2
2376
September1st to 10thDay
46%5%10%22%14%3
2160
11th to 20thDay
40%7%11%24%17%1
2139
21st to endDay
48%5%12%20%15%1
1890
October1st to 10thDay
47%7%12%20%13%1
1800
11th to 20thDay
53%5%11%22%10%
1800
21st to endDay
56%6%12%17%9%1
1980
November1st to 10thDay
45%6%13%19%14%3
1735
11th to 20thDay
56%6%11%18%6%2
1541
21st to endDay
60%5%11%17%6%1
1520
December1st to 10thDay
70%5%10%11%4
1520
11th to 20thDay
64%6%12%14%5%
1906
21st to endDay
72%5%10%11%2
2772
January1st to 10thNight
63%7%10%15%5%
4429
11th to 20thNight
67%7%11%11%31
4152
21st to endNight
72%47%12%41
4532
February1st to 10thNight
59%5%12%16%7%
2470
11th to 20thNight
57%5%12%17%8%
2405
21st to endNight
59%410%16%10%1
1919
March1st to 10thNight
51%6%11%22%8%1
2104
11th to 20thNight
53%5%11%19%11%1
2090
21st to endNight
52%5%9%18%14%3
2246
April1st to 10thNight
54%6%8%18%13%1
1800
11th to 20thNight
48%6%11%19%13%3
1775
21st to endNight
48%6%10%20%13%2
1720
May1st to 10thNight
51%6%10%20%10%3
1620
11th to 20thNight
46%7%10%20%16%1
1434
21st to endNight
41%8%15%21%13%3
1551
June1st to 10thNight
40%7%13%25%14%1
1440
11th to 20thNight
40%10%13%23%13%2
1440
21st to endNight
38%8%13%27%13%
1440
July1st to 10thNight
37%8%12%25%16%2
1400
11th to 20thNight
32%8%16%23%19%2
1392
21st to endNight
36%9%17%20%17%1
1666
August1st to 10thNight
34%9%17%27%12%1
1600
11th to 20thNight
41%9%14%23%13%1
1598
21st to endNight
38%9%12%24%13%3
1963
September1st to 10thNight
41%6%10%26%15%3
1800
11th to 20thNight
35%5%13%27%18%2
1818
21st to endNight
45%6%12%21%15%1
2070
October1st to 10thNight
43%7%14%20%15%1
2160
11th to 20thNight
47%6%15%20%11%1
2160
21st to endNight
53%6%13%18%10%1
2376
November1st to 10thNight
40%6%13%23%15%2
2342
11th to 20thNight
55%412%17%9%2
2636
21st to endNight
56%6%14%18%6%1
2660
December1st to 10thNight
64%8%11%13%4
2660
11th to 20thNight
62%6%11%17%4
3288
21st to endNight
68%7%12%12%2
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
34%24%30%7%6%
180
11th to 20thDay
40%24%25%8%2
258
21st to endDay
34%25%29%9%2
297
February1st to 10thDay
34%29%27%9%1
270
11th to 20thDay
42%25%27%41
270
21st to endDay
43%21%25%10%2
345
March1st to 10thDay
33%22%28%13%4
460
11th to 20thDay
32%24%27%13%31
460
21st to endDay
34%23%24%13%42
490
April1st to 10thDay
31%24%24%14%5%2
420
11th to 20thDay
30%22%22%15%7%4
412
21st to endDay
32%17%29%13%7%2
420
May1st to 10thDay
31%18%25%14%9%3
423
11th to 20thDay
27%16%28%18%8%3
447
21st to endDay
20%11%27%21%15%5%
485
June1st to 10thDay
18%17%28%24%12%2
450
11th to 20thDay
19%15%26%24%13%4
450
21st to endDay
17%13%31%26%10%2
450
July1st to 10thDay
15%10%24%26%18%9%
445
11th to 20thDay
11%9%29%25%19%7%
444
21st to endDay
14%10%28%27%15%5%
488
August1st to 10thDay
11%7%25%27%21%8%
446
11th to 20thDay
15%9%24%26%15%10%
439
21st to endDay
17%9%27%22%15%10%
495
September1st to 10thDay
21%13%19%23%16%9%
450
11th to 20thDay
16%7%24%22%22%10%
450
21st to endDay
24%13%23%20%16%5%
450
October1st to 10thDay
24%12%22%19%18%5%
450
11th to 20thDay
29%16%26%18%8%2
450
21st to endDay
32%19%25%18%6%1
495
November1st to 10thDay
25%17%22%20%14%2
397
11th to 20thDay
34%25%24%12%5%
201
21st to endDay
35%21%35%6%3
180
December1st to 10thDay
38%27%23%8%41
180
11th to 20thDay
43%16%26%13%2
180
21st to endDay
42%18%28%8%3
198
January1st to 10thNight
31%24%28%14%3
760
11th to 20thNight
30%22%27%18%3
760
21st to endNight
28%24%28%18%2
836
February1st to 10thNight
30%20%29%19%2
760
11th to 20thNight
31%24%30%13%1
743
21st to endNight
32%21%27%18%2
628
March1st to 10thNight
27%22%29%20%2
760
11th to 20thNight
31%20%24%20%5%1
760
21st to endNight
23%21%30%20%5%1
821
April1st to 10thNight
29%18%26%22%4
720
11th to 20thNight
25%16%27%23%8%1
711
21st to endNight
25%14%24%29%7%
640
May1st to 10thNight
24%10%21%30%15%1
540
11th to 20thNight
19%11%24%37%8%
372
21st to endNight
13%9%23%30%23%2
389
June1st to 10thNight
15%5%23%40%16%1
360
11th to 20thNight
14%10%18%42%16%1
360
21st to endNight
13%425%43%15%
360
July1st to 10thNight
15%5%16%35%25%4
350
11th to 20thNight
8%318%41%29%1
348
21st to endNight
11%419%41%23%2
584
August1st to 10thNight
11%316%42%27%2
537
11th to 20thNight
15%5%11%36%29%4
534
21st to endNight
13%5%19%31%29%3
775
September1st to 10thNight
18%6%17%32%23%3
720
11th to 20thNight
17%6%19%27%27%6%
720
21st to endNight
20%11%19%27%19%4
720
October1st to 10thNight
22%9%18%27%20%3
720
11th to 20thNight
25%14%24%26%10%1
720
21st to endNight
30%15%23%27%6%
792
November1st to 10thNight
20%14%25%30%10%
740
11th to 20thNight
27%18%26%21%7%1
760
21st to endNight
27%17%28%22%5%1
760
December1st to 10thNight
32%21%27%14%5%
760
11th to 20thNight
28%20%28%20%3
760
21st to endNight
30%21%27%21%2
836
Page generated at 2024-03-24 23:37:02. Version ac07

Copyright © 2024 Attilla Danko.


Sinnemahoning State Park Clear Sky Chart |Charts Home