This page made possible by the sponsorship of:
, Alexander Focsha.

Cherry Springs State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Cherry Springs State Park clear sky chart from 2005-11-06 to 2024-01-16.

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
27%
23075
14%
74803
8%
23025
34%
23025
15%
53329

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
9%
758
11%
2649
2%
757
19%
757
7%
2022
January11th to 20thNight
13%
741
8%
2454
3%
741
20%
741
8%
1924
January21st to endNight
12%
792
11%
2574
4%
792
21%
792
8%
2011
February1st to 10thNight
10%
720
10%
2340
2%
720
20%
720
9%
1801
February11th to 20thNight
8%
703
11%
2275
3%
700
19%
700
8%
1687
February21st to endNight
11%
592
13%
1803
3%
592
23%
592
10%
1359
March1st to 10thNight
14%
720
15%
2008
6%
720
24%
720
13%
1494
March11th to 20thNight
18%
720
16%
1980
7%
720
27%
720
13%
1470
March21st to endNight
16%
792
17%
2157
6%
792
26%
792
15%
1572
April1st to 10thNight
18%
720
12%
1800
3%
720
24%
720
15%
1376
April11th to 20thNight
22%
711
14%
1775
4%
711
27%
711
20%
1278
April21st to endNight
25%
644
16%
1724
5%
644
31%
644
20%
1212
May1st to 10thNight
33%
536
13%
1616
7%
536
38%
536
18%
1155
May11th to 20thNight
34%
354
17%
1416
13%
354
44%
354
15%
930
May21st to endNight
45%
388
15%
1551
15%
388
51%
388
18%
957
June1st to 10thNight
42%
360
16%
1440
15%
360
52%
360
20%
881
June11th to 20thNight
46%
360
15%
1440
16%
360
53%
360
19%
884
June21st to endNight
44%
360
16%
1440
17%
360
52%
360
22%
861
July1st to 10thNight
52%
350
14%
1400
17%
350
57%
350
23%
835
July11th to 20thNight
60%
348
19%
1392
25%
348
63%
348
27%
782
July21st to endNight
53%
555
16%
1639
13%
525
57%
525
28%
1048
August1st to 10thNight
56%
537
16%
1600
11%
534
59%
534
29%
1000
August11th to 20thNight
51%
534
17%
1598
11%
534
54%
534
25%
1063
August21st to endNight
53%
779
18%
1967
10%
779
56%
779
29%
1320
September1st to 10thNight
45%
720
20%
1800
9%
720
49%
720
29%
1216
September11th to 20thNight
50%
720
25%
1803
16%
720
54%
720
34%
1162
September21st to endNight
39%
720
19%
2078
15%
720
43%
720
23%
1406
October1st to 10thNight
37%
720
15%
2160
11%
720
43%
720
22%
1465
October11th to 20thNight
27%
720
13%
2160
7%
720
35%
720
18%
1501
October21st to endNight
20%
792
16%
2376
7%
792
31%
792
14%
1752
November1st to 10thNight
29%
740
19%
2361
12%
740
39%
740
21%
1519
November11th to 20thNight
20%
760
13%
2631
8%
760
28%
760
12%
1906
November21st to endNight
17%
760
12%
2660
6%
760
26%
760
11%
1959
December1st to 10thNight
12%
760
7%
2660
4%
760
16%
760
7%
2129
December11th to 20thNight
14%
760
9%
3228
3%
759
21%
759
6%
2485
December21st to endNight
11%
829
6%
4848
3%
817
19%
817
4%
3907

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%10%48%6%35%5%5%7%30%
74705
Night
16%11%5%8%6%35%45%6%31%
75079
TransparencyDay
53%6%11%18%10%1
74420
Night
52%6%12%19%10%1
74899
SeeingDay
26%18%28%17%8%3
13564
Night
24%17%27%22%9%1
23085

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%16%8%12%8%345%5%421%
1517
11th to 20thDay
14%18%8%12%9%45%445%18%
1614
21st to endDay
12%16%9%14%10%45%445%18%
1782
February1st to 10thDay
16%16%7%12%9%46%44419%
1620
11th to 20thDay
14%13%7%13%8%45%436%23%
1573
21st to endDay
19%14%311%7%33346%27%
1451
March1st to 10thDay
15%12%6%10%6%3445%6%30%
1945
11th to 20thDay
16%13%6%8%8%3435%6%28%
1980
21st to endDay
19%12%5%8%7%3345%5%29%
2198
April1st to 10thDay
17%14%6%6%5%3345%6%30%
2160
11th to 20thDay
18%11%46%6%35%5%5%5%32%
2134
21st to endDay
22%10%45%6%44345%33%
2250
May1st to 10thDay
21%11%46%5%36%45%5%29%
2344
11th to 20thDay
22%8%47%6%45%5%5%6%30%
2478
21st to endDay
16%6%346%36%5%5%8%37%
2725
June1st to 10thDay
16%7%36%6%36%5%6%8%34%
2520
11th to 20thDay
16%7%36%6%5%6%6%5%9%32%
2520
21st to endDay
15%6%35%6%45%6%6%9%35%
2520
July1st to 10thDay
12%6%36%7%46%5%6%8%35%
2520
11th to 20thDay
12%6%37%6%46%7%7%9%34%
2520
21st to endDay
12%7%37%6%46%6%6%8%36%
2579
August1st to 10thDay
12%5%37%6%47%6%7%9%33%
2327
11th to 20thDay
14%7%37%7%46%6%7%9%30%
2296
21st to endDay
16%6%26%5%45%7%7%8%32%
2376
September1st to 10thDay
21%7%35%4345%5%6%37%
2160
11th to 20thDay
15%5%36%43445%6%42%
2155
21st to endDay
23%6%26%5%45%5%5%6%33%
1882
October1st to 10thDay
18%8%47%5%35%6%5%8%32%
1800
11th to 20thDay
22%9%46%6%345%5%6%31%
1800
21st to endDay
24%13%47%6%4345%5%25%
1980
November1st to 10thDay
13%11%46%6%3445%7%37%
1717
11th to 20thDay
18%14%5%9%6%345%5%6%26%
1544
21st to endDay
19%17%6%8%6%34446%23%
1520
December1st to 10thDay
19%18%7%13%6%45%345%16%
1520
11th to 20thDay
19%16%6%12%5%3445%6%19%
1906
21st to endDay
22%23%8%9%6%2434415%
2772
January1st to 10thNight
14%15%6%11%7%47%6%5%6%19%
2649
11th to 20thNight
17%14%6%11%8%45%5%5%6%19%
2454
21st to endNight
13%14%7%13%9%5%6%445%20%
2574
February1st to 10thNight
14%14%7%10%8%46%445%23%
2340
11th to 20thNight
15%12%6%10%8%36%5%5%7%23%
2273
21st to endNight
18%11%5%11%7%45%45%6%24%
1803
March1st to 10thNight
13%9%6%9%7%46%6%5%7%28%
1998
11th to 20thNight
18%12%5%7%6%45%435%31%
1979
21st to endNight
16%12%47%7%35%45%6%31%
2157
April1st to 10thNight
19%11%5%8%6%445%46%29%
1800
11th to 20thNight
17%11%37%5%33446%35%
1775
21st to endNight
17%11%36%5%35%45%6%35%
1724
May1st to 10thNight
20%10%36%5%35%445%34%
1616
11th to 20thNight
17%7%37%6%36%45%7%35%
1415
21st to endNight
13%6%35%5%445%5%7%41%
1550
June1st to 10thNight
13%7%35%6%4446%8%39%
1440
11th to 20thNight
13%6%35%5%446%7%9%38%
1440
21st to endNight
13%6%26%425%5%6%8%43%
1440
July1st to 10thNight
11%6%36%5%35%5%6%7%44%
1440
11th to 20thNight
9%5%35%5%45%45%9%47%
1440
21st to endNight
12%5%35%5%345%6%9%42%
1735
August1st to 10thNight
9%5%36%5%46%5%6%8%44%
1611
11th to 20thNight
14%7%46%5%3446%8%40%
1598
21st to endNight
13%6%25%6%35%5%6%8%41%
1967
September1st to 10thNight
16%7%25%5%2345%6%44%
1800
11th to 20thNight
14%5%25%433446%48%
1803
21st to endNight
19%7%35%5%3445%6%38%
2078
October1st to 10thNight
18%9%25%5%3445%7%38%
2160
11th to 20thNight
21%11%35%5%3445%6%34%
2160
21st to endNight
24%13%37%5%3445%6%28%
2376
November1st to 10thNight
13%9%35%6%35%45%6%40%
2361
11th to 20thNight
18%12%5%8%7%35%45%6%28%
2631
21st to endNight
16%14%6%9%6%45%45%7%23%
2660
December1st to 10thNight
19%15%8%9%7%46%5%5%5%17%
2660
11th to 20thNight
17%16%5%12%8%35%445%21%
3288
21st to endNight
21%16%9%10%7%35%45%6%14%
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
62%5%11%15%6%1
1518
11th to 20thDay
68%5%10%10%6%1
1614
21st to endDay
68%49%12%6%1
1782
February1st to 10thDay
67%5%11%11%6%
1620
11th to 20thDay
62%5%7%18%8%1
1582
21st to endDay
60%38%19%8%2
1451
March1st to 10thDay
54%411%20%9%1
1948
11th to 20thDay
57%5%9%18%9%3
1980
21st to endDay
56%5%7%18%12%3
2198
April1st to 10thDay
54%5%9%19%11%2
2160
11th to 20thDay
52%6%10%16%14%1
2134
21st to endDay
52%6%7%19%13%2
2250
May1st to 10thDay
54%6%10%18%10%2
2344
11th to 20thDay
54%7%9%17%12%2
2482
21st to endDay
44%8%16%19%11%1
2725
June1st to 10thDay
47%7%11%20%13%1
2520
11th to 20thDay
48%7%13%19%12%1
2520
21st to endDay
44%8%12%25%11%
2520
July1st to 10thDay
43%9%11%23%13%1
2450
11th to 20thDay
43%8%15%22%12%
2445
21st to endDay
44%8%13%23%11%1
2435
August1st to 10thDay
44%9%14%23%10%
2314
11th to 20thDay
47%9%15%19%9%1
2296
21st to endDay
47%7%12%20%12%2
2376
September1st to 10thDay
46%5%10%22%14%2
2160
11th to 20thDay
40%6%11%23%18%1
2155
21st to endDay
49%6%11%19%14%1
1882
October1st to 10thDay
49%7%11%20%13%1
1800
11th to 20thDay
53%5%12%21%10%1
1800
21st to endDay
57%6%11%16%8%2
1980
November1st to 10thDay
46%6%11%20%13%3
1717
11th to 20thDay
57%5%11%19%6%2
1544
21st to endDay
61%6%10%17%6%1
1520
December1st to 10thDay
69%5%10%10%5%
1520
11th to 20thDay
64%5%12%14%5%
1906
21st to endDay
72%6%10%11%2
2772
January1st to 10thNight
61%6%11%15%7%1
2649
11th to 20thNight
63%6%14%11%5%1
2454
21st to endNight
62%6%9%15%7%1
2574
February1st to 10thNight
61%6%12%14%7%
2340
11th to 20thNight
57%6%11%18%7%1
2275
21st to endNight
59%410%15%10%2
1803
March1st to 10thNight
52%7%10%22%7%2
2008
11th to 20thNight
55%5%10%19%10%1
1980
21st to endNight
52%5%9%16%14%3
2157
April1st to 10thNight
56%5%8%18%12%1
1800
11th to 20thNight
49%6%11%19%13%2
1775
21st to endNight
49%5%11%20%13%2
1724
May1st to 10thNight
52%5%10%21%11%2
1616
11th to 20thNight
48%6%10%20%15%1
1416
21st to endNight
40%9%15%21%12%3
1551
June1st to 10thNight
40%8%13%24%14%1
1440
11th to 20thNight
40%8%14%25%12%2
1440
21st to endNight
38%8%13%28%13%
1440
July1st to 10thNight
37%8%13%25%15%2
1400
11th to 20thNight
32%8%16%24%18%1
1392
21st to endNight
38%8%15%21%17%1
1639
August1st to 10thNight
35%9%15%30%10%1
1600
11th to 20thNight
41%8%15%24%11%
1598
21st to endNight
39%8%13%25%13%2
1967
September1st to 10thNight
41%6%12%25%14%3
1800
11th to 20thNight
36%5%13%26%18%2
1803
21st to endNight
44%6%14%22%13%1
2078
October1st to 10thNight
45%7%13%21%14%1
2160
11th to 20thNight
47%7%15%19%11%1
2160
21st to endNight
55%5%13%17%9%1
2376
November1st to 10thNight
42%6%14%21%15%2
2361
11th to 20thNight
55%6%12%16%9%2
2631
21st to endNight
57%6%13%19%5%1
2660
December1st to 10thNight
64%8%11%12%4
2660
11th to 20thNight
64%5%10%18%4
3288
21st to endNight
68%7%11%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
36%25%27%9%4
180
11th to 20thDay
39%29%23%6%1
232
21st to endDay
33%28%29%8%2
264
February1st to 10thDay
41%30%27%3
240
11th to 20thDay
40%29%29%2
240
21st to endDay
42%24%26%8%1
317
March1st to 10thDay
32%26%29%11%2
420
11th to 20thDay
30%26%27%12%31
420
21st to endDay
35%23%24%12%41
462
April1st to 10thDay
31%24%28%13%42
420
11th to 20thDay
30%23%26%13%6%3
412
21st to endDay
32%19%32%11%5%1
420
May1st to 10thDay
32%19%27%12%7%3
423
11th to 20thDay
28%17%31%14%6%2
447
21st to endDay
21%14%27%21%12%6%
485
June1st to 10thDay
18%16%32%24%8%1
450
11th to 20thDay
21%16%26%23%13%2
450
21st to endDay
19%12%35%24%8%2
450
July1st to 10thDay
14%9%27%27%15%7%
445
11th to 20thDay
12%8%32%29%14%5%
444
21st to endDay
15%11%33%24%12%5%
488
August1st to 10thDay
13%9%26%29%16%7%
446
11th to 20thDay
16%8%28%26%14%8%
439
21st to endDay
15%12%28%24%12%8%
495
September1st to 10thDay
22%11%20%25%14%8%
450
11th to 20thDay
16%10%26%20%20%8%
450
21st to endDay
23%14%24%21%14%4
450
October1st to 10thDay
26%12%25%20%13%4
450
11th to 20thDay
26%21%31%16%6%1
450
21st to endDay
34%21%27%14%4
495
November1st to 10thDay
26%19%27%16%10%1
388
11th to 20thDay
35%24%26%12%2
204
21st to endDay
33%27%31%8%11
180
December1st to 10thDay
40%26%25%5%31
180
11th to 20thDay
38%26%26%9%1
180
21st to endDay
40%26%29%41
198
January1st to 10thNight
28%27%31%11%3
760
11th to 20thNight
29%25%29%15%2
741
21st to endNight
26%28%31%15%1
792
February1st to 10thNight
28%25%34%12%2
720
11th to 20thNight
30%28%32%10%1
703
21st to endNight
33%26%28%12%2
592
March1st to 10thNight
24%27%32%15%2
720
11th to 20thNight
30%23%25%17%3
720
21st to endNight
23%24%32%16%41
792
April1st to 10thNight
28%21%30%19%3
720
11th to 20thNight
26%17%30%19%6%1
711
21st to endNight
25%14%31%25%5%
644
May1st to 10thNight
26%12%24%27%11%
536
11th to 20thNight
19%12%29%31%9%
354
21st to endNight
16%9%25%32%18%1
389
June1st to 10thNight
17%6%29%34%13%1
360
11th to 20thNight
16%10%23%41%10%
360
21st to endNight
12%6%32%37%12%1
360
July1st to 10thNight
12%5%23%37%21%2
350
11th to 20thNight
10%322%41%23%1
348
21st to endNight
13%420%42%18%2
555
August1st to 10thNight
12%420%39%24%1
537
11th to 20thNight
16%5%17%33%25%4
534
21st to endNight
14%6%20%35%22%3
779
September1st to 10thNight
19%7%22%31%18%3
720
11th to 20thNight
16%8%21%28%24%4
720
21st to endNight
21%12%22%25%17%4
720
October1st to 10thNight
23%12%25%22%17%2
720
11th to 20thNight
26%17%27%23%7%1
720
21st to endNight
32%17%27%20%4
792
November1st to 10thNight
18%18%32%24%8%
740
11th to 20thNight
28%20%28%18%5%1
760
21st to endNight
26%20%33%17%31
760
December1st to 10thNight
32%24%28%12%4
760
11th to 20thNight
29%24%29%15%3
760
21st to endNight
31%24%30%14%1
836
Page generated at 2024-01-13 01:38:10. Version ac07

Copyright 2024 Attilla Danko


Cherry Springs State Park Clear Sky Chart |Charts Home