Caesar Creek State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Caesar Creek State Park clear sky chart from 2005-11-05 to 2017-08-12.

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
43%
15350
18%
46247
13%
15308
48%
15308
23%
31157

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 15thNight
18%
777
12%
2383
6%
772
25%
772
12%
1870
January16th to endNight
21%
768
13%
2496
8%
768
28%
768
13%
1880
February1st to 15thNight
23%
701
12%
2190
7%
701
29%
701
15%
1608
February16th to endNight
23%
631
13%
1893
6%
631
30%
631
16%
1404
March1st to 15thNight
29%
720
14%
2079
9%
720
33%
720
18%
1500
March16th to endNight
33%
768
15%
2112
9%
768
39%
768
22%
1503
April1st to 15thNight
33%
592
16%
1850
10%
592
40%
592
23%
1232
April16th to endNight
41%
540
21%
1629
11%
540
51%
540
27%
1050
May1st to 15thNight
39%
540
16%
1620
10%
540
45%
540
21%
1142
May16th to endNight
59%
562
17%
1684
14%
561
62%
561
29%
1057
June1st to 15thNight
68%
540
18%
1581
15%
540
71%
540
37%
930
June16th to endNight
66%
540
17%
1440
13%
540
69%
540
36%
893
July1st to 15thNight
64%
510
17%
1377
15%
510
65%
510
34%
876
July16th to endNight
74%
564
21%
1595
19%
531
75%
531
39%
911
August1st to 15thNight
72%
527
23%
1575
20%
524
74%
524
36%
932
August16th to endNight
76%
525
22%
1657
22%
525
78%
525
39%
900
September1st to 15thNight
69%
616
29%
1771
24%
616
72%
616
39%
1005
September16th to endNight
60%
657
27%
1815
21%
657
63%
657
34%
1112
October1st to 15thNight
53%
660
27%
1867
23%
660
58%
660
34%
1141
October16th to endNight
39%
704
21%
2181
17%
704
46%
704
23%
1455
November1st to 15thNight
44%
700
25%
2276
20%
700
53%
700
29%
1358
November16th to endNight
31%
720
17%
2340
13%
720
38%
720
17%
1641
December1st to 15thNight
25%
720
11%
2340
7%
720
29%
720
13%
1789
December16th to endNight
21%
768
12%
2496
5%
768
28%
768
10%
1968

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
14%7%36%5%3445%7%35%
47684
Night
14%7%36%5%3445%6%38%
46431
Cloud CoverDay
15%7%36%5%3445%7%35%
47694
Night
14%7%36%5%2445%7%38%
46435
TransparencyDay
47%6%11%20%12%1
47386
Night
45%5%11%21%13%2
46247
SeeingDay
17%6%22%24%18%10%
5497
Night
17%6%25%30%16%2
15354

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 15thDay
21%12%5%10%5%3335%5%21%
1523
16th to endDay
15%15%6%10%5%35%35%5%23%
1728
February1st to 15thDay
16%13%5%9%5%34335%27%
1669
16th to endDay
15%14%49%6%35%445%26%
1580
March1st to 15thDay
21%9%5%6%6%34345%28%
1869
16th to endDay
19%9%46%6%33448%29%
2112
April1st to 15thDay
16%8%46%5%24346%36%
2109
16th to endDay
17%6%36%43435%6%37%
2331
May1st to 15thDay
21%8%36%5%4445%7%29%
2331
16th to endDay
11%6%26%5%36%5%6%7%37%
2431
June1st to 15thDay
10%5%36%6%35%6%6%8%39%
2376
16th to endDay
9%425%5%36%6%6%9%38%
2520
July1st to 15thDay
11%6%35%6%36%6%6%9%34%
2499
16th to endDay
8%4245%46%7%7%9%38%
2465
August1st to 15thDay
7%325%5%46%6%7%9%41%
2288
16th to endDay
7%3246%35%5%7%9%43%
2190
September1st to 15thDay
11%5%145%3435%7%45%
1846
16th to endDay
14%5%25%5%2335%6%44%
1815
October1st to 15thDay
12%415%5%4445%7%43%
1763
16th to endDay
20%7%34313347%39%
1689
November1st to 15thDay
10%6%36%424347%47%
1582
16th to endDay
18%9%47%5%34346%32%
1620
December1st to 15thDay
24%12%6%9%5%34345%21%
1620
16th to endDay
22%15%6%8%433446%22%
1728
January1st to 15thNight
19%12%5%10%6%3444423%
2383
16th to endNight
16%14%6%9%6%3444427%
2496
February1st to 15thNight
19%11%46%5%34335%30%
2188
16th to endNight
17%13%6%7%5%34435%29%
1893
March1st to 15thNight
17%7%37%6%35%46%5%33%
2067
16th to endNight
17%7%45%5%345%47%34%
2112
April1st to 15thNight
15%7%46%5%2445%7%38%
1850
16th to endNight
14%5%25%5%2345%7%41%
1629
May1st to 15thNight
19%6%36%6%2445%8%33%
1620
16th to endNight
10%4245%25%5%7%9%41%
1682
June1st to 15thNight
6%32442445%10%50%
1581
16th to endNight
5%2235%36%6%7%11%45%
1440
July1st to 15thNight
9%4244335%6%7%47%
1458
16th to endNight
5%3245%2447%7%50%
1703
August1st to 15thNight
5%4244346%6%8%49%
1586
16th to endNight
6%22342336%10%53%
1657
September1st to 15thNight
10%41231345%7%54%
1771
16th to endNight
12%5%24424346%50%
1815
October1st to 15thNight
10%5%25%422447%48%
1867
16th to endNight
17%7%35%424346%39%
2181
November1st to 15thNight
13%5%34434347%46%
2276
16th to endNight
19%9%46%5%24446%32%
2340
December1st to 15thNight
23%11%5%8%5%24335%26%
2340
16th to endNight
22%14%6%7%5%34345%22%
2496

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 15thDay
21%11%5%10%7%2435%422%
1523
16th to endDay
16%14%7%10%5%34346%22%
1728
February1st to 15thDay
17%13%5%9%6%24435%27%
1669
16th to endDay
15%14%5%8%6%34445%26%
1580
March1st to 15thDay
22%10%5%6%5%24345%28%
1880
16th to endDay
19%10%46%5%34348%28%
2111
April1st to 15thDay
17%9%35%5%24347%36%
2109
16th to endDay
17%6%25%435%45%6%38%
2331
May1st to 15thDay
21%8%36%5%35%446%31%
2331
16th to endDay
11%6%35%5%26%6%5%8%38%
2431
June1st to 15thDay
10%435%6%35%5%6%9%40%
2376
16th to endDay
10%425%5%36%5%6%10%39%
2520
July1st to 15thDay
12%5%26%5%35%5%6%10%35%
2499
16th to endDay
8%4245%46%6%7%9%39%
2465
August1st to 15thDay
7%425%5%35%6%7%9%41%
2288
16th to endDay
7%425%6%35%5%6%10%43%
2190
September1st to 15thDay
12%5%135%35%45%6%46%
1846
16th to endDay
14%5%35%423347%44%
1815
October1st to 15thDay
12%5%15%5%3445%6%44%
1763
16th to endDay
21%6%25%322346%40%
1689
November1st to 15thDay
10%6%35%5%24346%47%
1582
16th to endDay
18%9%47%5%34336%33%
1620
December1st to 15thDay
24%12%6%8%5%34335%21%
1620
16th to endDay
21%15%5%8%433346%22%
1728
January1st to 15thNight
20%12%6%9%6%3434423%
2383
16th to endNight
16%14%6%8%5%3433427%
2496
February1st to 15thNight
19%10%5%6%5%35%335%31%
2181
16th to endNight
17%12%6%8%5%33445%29%
1893
March1st to 15thNight
17%8%37%6%35%35%6%32%
2079
16th to endNight
17%7%35%5%25%447%34%
2112
April1st to 15thNight
16%7%36%4245%5%6%38%
1850
16th to endNight
14%5%35%5%1445%7%41%
1629
May1st to 15thNight
19%7%26%5%3445%8%33%
1619
16th to endNight
9%5%244346%6%10%41%
1682
June1st to 15thNight
6%42342445%9%51%
1581
16th to endNight
5%223435%6%8%11%45%
1440
July1st to 15thNight
9%425%42446%7%47%
1458
16th to endNight
6%324425%36%8%51%
1703
August1st to 15thNight
5%4244246%6%8%50%
1586
16th to endNight
6%31433335%10%53%
1657
September1st to 15thNight
10%31232345%7%54%
1771
16th to endNight
12%5%24424345%50%
1815
October1st to 15thNight
10%425%43345%7%49%
1867
16th to endNight
18%6%35%423346%39%
2181
November1st to 15thNight
13%5%34324346%46%
2276
16th to endNight
19%10%36%5%24346%32%
2340
December1st to 15thNight
23%11%5%9%424345%26%
2340
16th to endNight
22%15%5%7%5%33445%22%
2496

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 15thDay
63%49%14%7%
1524
16th to endDay
62%6%12%13%4
1728
February1st to 15thDay
60%5%10%14%8%
1671
16th to endDay
59%5%11%18%5%
1580
March1st to 15thDay
57%5%12%18%6%
1880
16th to endDay
54%5%12%20%6%
2112
April1st to 15thDay
49%410%23%10%1
2109
16th to endDay
46%5%10%19%13%4
2331
May1st to 15thDay
53%6%11%18%8%
2331
16th to endDay
42%8%13%22%12%1
2435
June1st to 15thDay
39%7%12%22%16%
2376
16th to endDay
39%7%15%19%15%2
2520
July1st to 15thDay
43%8%10%20%15%1
2351
16th to endDay
36%10%14%24%11%2
2310
August1st to 15thDay
35%7%14%24%15%2
2275
16th to endDay
35%7%12%24%15%4
2190
September1st to 15thDay
37%6%9%21%21%4
1846
16th to endDay
40%49%18%25%1
1815
October1st to 15thDay
39%5%10%22%19%2
1763
16th to endDay
44%312%23%13%1
1689
November1st to 15thDay
38%49%23%20%4
1582
16th to endDay
53%310%20%11%
1620
December1st to 15thDay
65%410%13%5%
1620
16th to endDay
63%5%11%14%4
1728
January1st to 15thNight
63%47%15%8%
2383
16th to endNight
60%310%18%5%
2496
February1st to 15thNight
56%411%18%7%
2190
16th to endNight
57%411%18%8%
1893
March1st to 15thNight
51%6%10%20%9%1
2079
16th to endNight
49%5%13%22%8%1
2112
April1st to 15thNight
44%411%22%14%1
1850
16th to endNight
41%411%21%15%6%
1629
May1st to 15thNight
49%5%10%23%9%1
1620
16th to endNight
35%8%14%23%14%4
1684
June1st to 15thNight
29%7%13%27%20%2
1581
16th to endNight
29%9%18%19%19%3
1440
July1st to 15thNight
34%6%12%22%18%4
1377
16th to endNight
28%6%14%31%16%2
1595
August1st to 15thNight
28%9%15%24%19%2
1575
16th to endNight
25%7%14%26%21%4
1657
September1st to 15thNight
27%6%11%24%24%5%
1771
16th to endNight
35%47%22%27%2
1815
October1st to 15thNight
34%5%9%25%20%3
1867
16th to endNight
45%48%25%12%2
2181
November1st to 15thNight
38%310%21%21%4
2276
16th to endNight
53%310%20%10%
2340
December1st to 15thNight
61%49%15%7%
2340
16th to endNight
64%49%15%5%
2496

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 15thDay
30%15%40%7%5%1
90
16th to endDay
30%17%36%14%1
96
February1st to 15thDay
21%24%37%13%3
90
16th to endDay
20%11%49%12%6%
81
March1st to 15thDay
28%10%31%25%4
170
16th to endDay
23%11%32%21%10%1
288
April1st to 15thDay
21%12%27%25%11%1
270
16th to endDay
21%6%26%23%15%7%
270
May1st to 15thDay
26%8%25%23%11%5%
288
16th to endDay
16%325%23%16%14%
331
June1st to 15thDay
9%315%35%25%10%
351
16th to endDay
10%325%32%20%7%
495
July1st to 15thDay
16%219%28%20%12%
455
16th to endDay
9%9%23%30%26%
326
August1st to 15thDay
10%110%22%28%26%
297
16th to endDay
9%110%21%33%24%
268
September1st to 15thDay
12%28%18%34%21%
255
16th to endDay
18%215%18%27%17%
254
October1st to 15thDay
10%5%22%32%20%9%
255
16th to endDay
21%5%31%28%10%
201
November1st to 15thDay
13%8%18%23%25%10%
90
16th to endDay
26%10%42%15%5%
90
December1st to 15thDay
27%11%33%17%7%2
90
16th to endDay
28%25%37%8%1
96
January1st to 15thNight
25%12%36%20%5%
777
16th to endNight
22%12%37%25%2
768
February1st to 15thNight
25%10%33%28%2
704
16th to endNight
25%9%35%26%2
631
March1st to 15thNight
20%10%33%29%5%
720
16th to endNight
20%8%32%26%11%
768
April1st to 15thNight
19%10%33%28%7%
592
16th to endNight
15%6%31%32%12%2
540
May1st to 15thNight
21%427%30%14%1
540
16th to endNight
11%218%36%25%5%
563
June1st to 15thNight
6%117%47%25%1
540
16th to endNight
5%117%42%29%2
540
July1st to 15thNight
11%111%40%29%4
510
16th to endNight
6%8%37%39%6%
564
August1st to 15thNight
6%110%37%37%6%
527
16th to endNight
6%19%32%42%7%
525
September1st to 15thNight
11%211%32%35%6%
616
16th to endNight
15%314%31%32%3
657
October1st to 15thNight
13%423%33%20%4
660
16th to endNight
20%6%28%30%12%
704
November1st to 15thNight
15%6%29%28%18%1
700
16th to endNight
24%10%27%27%9%
720
December1st to 15thNight
28%9%28%25%6%1
720
16th to endNight
29%10%31%23%4
768
Page generated at 2017-08-13 14:16:45. Version ac04

Copyright 2017 A. Danko


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