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Cincinnati
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Cincinnati clear sky chart from 2005-11-05 to 2018-02-22.

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
37%
16235
19%
48705
12%
16191
44%
16191
21%
32292

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
19%
946
13%
2687
6%
941
26%
941
13%
2087
January16th to endNight
19%
832
15%
2704
7%
832
29%
832
13%
1985
February1st to 15thNight
19%
763
12%
2344
5%
761
26%
761
13%
1693
February16th to endNight
19%
659
14%
1977
7%
659
26%
659
13%
1445
March1st to 15thNight
23%
720
15%
2097
8%
720
30%
720
16%
1487
March16th to endNight
27%
768
16%
2112
8%
768
35%
768
19%
1490
April1st to 15thNight
28%
566
18%
1824
11%
566
39%
566
20%
1193
April16th to endNight
34%
540
21%
1651
8%
540
45%
540
22%
1048
May1st to 15thNight
30%
540
16%
1620
7%
540
38%
540
18%
1123
May16th to endNight
45%
562
18%
1684
10%
561
51%
561
24%
1048
June1st to 15thNight
54%
540
19%
1551
14%
540
60%
540
32%
893
June16th to endNight
52%
540
18%
1440
10%
540
59%
540
33%
878
July1st to 15thNight
54%
510
17%
1360
12%
510
58%
510
31%
865
July16th to endNight
62%
564
21%
1584
15%
531
71%
531
35%
892
August1st to 15thNight
63%
539
24%
1609
19%
536
67%
536
35%
926
August16th to endNight
71%
573
25%
1845
23%
573
76%
573
37%
980
September1st to 15thNight
60%
657
28%
1917
24%
657
64%
657
35%
1098
September16th to endNight
55%
717
30%
1980
21%
717
60%
717
33%
1210
October1st to 15thNight
51%
720
28%
2016
22%
720
57%
720
32%
1206
October16th to endNight
37%
768
24%
2399
19%
768
46%
768
24%
1531
November1st to 15thNight
37%
760
24%
2471
17%
760
48%
760
25%
1481
November16th to endNight
28%
780
20%
2535
12%
780
38%
780
17%
1706
December1st to 15thNight
23%
780
12%
2535
7%
780
30%
780
13%
1877
December16th to endNight
16%
891
12%
2763
5%
891
24%
891
10%
2150

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%35%45%7%36%
49528
Night
14%7%36%424447%39%
48886
Cloud CoverDay
14%7%36%5%3445%7%36%
49537
Night
14%7%36%5%2445%7%39%
48891
TransparencyDay
46%5%11%21%13%2
49227
Night
44%410%22%14%2
48705
SeeingDay
15%14%23%21%16%8%
6176
Night
15%19%22%25%14%1
16237

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
19%11%6%9%5%24445%26%
1575
16th to endDay
14%14%5%9%5%34346%28%
1872
February1st to 15thDay
17%13%48%5%24346%29%
1846
16th to endDay
18%12%5%8%6%2444429%
1643
March1st to 15thDay
22%10%25%5%24446%31%
1853
16th to endDay
19%9%45%5%25%45%5%31%
2112
April1st to 15thDay
18%7%35%424446%38%
2133
16th to endDay
17%6%36%5%25%347%38%
2307
May1st to 15thDay
22%6%35%6%35%45%6%31%
2331
16th to endDay
12%6%25%5%37%5%6%8%35%
2431
June1st to 15thDay
11%326%5%346%6%8%41%
2405
16th to endDay
9%425%5%46%6%5%8%41%
2520
July1st to 15thDay
11%5%36%6%35%5%6%8%35%
2520
16th to endDay
7%425%5%47%7%7%11%37%
2474
August1st to 15thDay
7%425%6%45%6%6%10%41%
2340
16th to endDay
7%4245%35%6%7%10%42%
2354
September1st to 15thDay
12%5%345%3445%6%44%
2030
16th to endDay
13%424424446%48%
1980
October1st to 15thDay
11%5%15%5%3445%7%44%
1944
16th to endDay
17%7%34423346%41%
1824
November1st to 15thDay
9%7%36%424445%46%
1717
16th to endDay
16%10%36%5%23346%36%
1755
December1st to 15thDay
23%10%5%8%5%33445%25%
1755
16th to endDay
20%14%5%7%6%33345%24%
1807
January1st to 15thNight
19%10%5%9%6%4443426%
2687
16th to endNight
16%13%5%7%5%25%335%30%
2704
February1st to 15thNight
20%10%48%424445%30%
2342
16th to endNight
18%12%46%5%2446%6%27%
1977
March1st to 15thNight
17%9%35%6%34446%33%
2084
16th to endNight
17%8%35%5%245%47%35%
2112
April1st to 15thNight
15%6%45%5%2345%6%39%
1824
16th to endNight
13%5%36%42445%8%40%
1651
May1st to 15thNight
18%6%35%425%45%6%35%
1620
16th to endNight
10%5%24425%6%6%10%42%
1682
June1st to 15thNight
6%4144244410%51%
1551
16th to endNight
6%224335%6%6%10%47%
1440
July1st to 15thNight
9%5%245%2435%9%46%
1440
16th to endNight
6%32443436%11%49%
1691
August1st to 15thNight
5%3244335%6%11%48%
1620
16th to endNight
43144145%5%10%53%
1845
September1st to 15thNight
11%41332435%7%52%
1917
16th to endNight
12%425%424335%51%
1980
October1st to 15thNight
10%31442435%8%49%
2016
16th to endNight
17%6%35%324345%43%
2399
November1st to 15thNight
14%5%25%42345%6%46%
2471
16th to endNight
18%8%36%434446%35%
2535
December1st to 15thNight
20%11%5%8%42434429%
2535
16th to endNight
22%12%5%8%6%23345%23%
2763

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
19%11%5%9%5%34435%25%
1575
16th to endDay
14%13%6%8%6%26%246%27%
1872
February1st to 15thDay
17%12%47%5%24446%29%
1846
16th to endDay
17%11%49%5%25%345%28%
1643
March1st to 15thDay
23%9%25%5%33346%31%
1863
16th to endDay
19%9%46%6%3445%6%31%
2111
April1st to 15thDay
18%6%35%434446%37%
2133
16th to endDay
17%6%25%5%34447%38%
2307
May1st to 15thDay
22%6%26%5%345%5%6%30%
2331
16th to endDay
11%5%26%6%36%5%6%9%35%
2431
June1st to 15thDay
11%325%5%25%6%6%9%41%
2405
16th to endDay
9%425%6%46%5%5%8%40%
2520
July1st to 15thDay
11%5%36%6%45%5%5%9%35%
2520
16th to endDay
8%424447%7%7%10%36%
2474
August1st to 15thDay
7%425%6%35%5%7%9%41%
2340
16th to endDay
7%415%5%345%8%10%42%
2354
September1st to 15thDay
11%5%25%5%435%5%6%44%
2030
16th to endDay
13%5%245%23446%47%
1980
October1st to 15thDay
11%5%25%5%3345%7%44%
1944
16th to endDay
17%7%25%5%23346%41%
1824
November1st to 15thDay
10%7%45%424336%46%
1717
16th to endDay
16%10%37%433346%37%
1755
December1st to 15thDay
23%10%5%7%6%23345%25%
1755
16th to endDay
21%13%6%6%6%33435%24%
1807
January1st to 15thNight
19%11%49%7%3443426%
2687
16th to endNight
16%13%5%8%5%3443430%
2704
February1st to 15thNight
19%10%48%433435%30%
2335
16th to endNight
18%12%47%5%145%5%6%27%
1977
March1st to 15thNight
17%9%35%6%3445%5%33%
2097
16th to endNight
16%8%35%5%245%46%35%
2112
April1st to 15thNight
14%7%35%42445%7%39%
1824
16th to endNight
14%5%26%5%25%35%8%40%
1651
May1st to 15thNight
18%6%35%5%3436%7%34%
1619
16th to endNight
9%4235%246%6%10%42%
1682
June1st to 15thNight
5%4245%234411%50%
1551
16th to endNight
5%315%435%5%7%10%47%
1440
July1st to 15thNight
9%5%3443435%8%46%
1440
16th to endNight
6%32443446%10%49%
1691
August1st to 15thNight
5%3244245%6%11%48%
1620
16th to endNight
5%22442446%9%54%
1845
September1st to 15thNight
10%41232345%6%53%
1917
16th to endNight
12%424423335%52%
1980
October1st to 15thNight
10%315%43445%7%49%
2016
16th to endNight
17%6%35%324345%43%
2399
November1st to 15thNight
14%5%2442445%6%46%
2471
16th to endNight
18%8%26%5%24446%36%
2535
December1st to 15thNight
20%11%5%8%424345%29%
2535
16th to endNight
22%12%5%8%6%33445%23%
2763

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
59%410%14%10%
1576
16th to endDay
57%313%19%5%
1872
February1st to 15thDay
55%411%18%8%
1848
16th to endDay
57%310%20%7%
1643
March1st to 15thDay
54%412%20%7%
1863
16th to endDay
54%411%20%8%
2112
April1st to 15thDay
46%410%23%13%1
2133
16th to endDay
45%39%22%14%4
2307
May1st to 15thDay
51%6%11%17%10%1
2331
16th to endDay
44%7%12%21%12%1
2435
June1st to 15thDay
37%6%13%23%17%1
2405
16th to endDay
38%7%12%21%17%3
2520
July1st to 15thDay
44%5%11%18%17%2
2371
16th to endDay
36%9%13%23%13%2
2318
August1st to 15thDay
36%5%14%23%17%2
2327
16th to endDay
33%7%12%24%16%4
2354
September1st to 15thDay
38%411%20%20%5%
2030
16th to endDay
37%48%23%24%1
1980
October1st to 15thDay
38%5%8%24%18%3
1944
16th to endDay
44%310%25%15%1
1824
November1st to 15thDay
39%47%25%18%4
1717
16th to endDay
49%38%23%14%
1755
December1st to 15thDay
61%310%15%8%
1755
16th to endDay
62%49%16%6%
1807
January1st to 15thNight
61%36%16%10%
2687
16th to endNight
57%39%20%6%
2704
February1st to 15thNight
55%312%19%7%
2344
16th to endNight
55%412%19%8%
1977
March1st to 15thNight
51%49%21%11%1
2097
16th to endNight
48%5%13%22%8%1
2112
April1st to 15thNight
44%49%22%16%2
1824
16th to endNight
41%410%20%15%7%
1651
May1st to 15thNight
48%5%11%22%9%1
1620
16th to endNight
35%7%14%21%16%4
1684
June1st to 15thNight
29%5%13%29%19%2
1551
16th to endNight
29%8%17%20%20%4
1440
July1st to 15thNight
36%5%11%23%18%5%
1360
16th to endNight
28%5%14%31%17%2
1584
August1st to 15thNight
29%6%14%28%19%2
1609
16th to endNight
25%6%13%28%21%4
1845
September1st to 15thNight
30%5%10%24%23%5%
1917
16th to endNight
35%36%24%27%2
1980
October1st to 15thNight
33%48%27%21%4
2016
16th to endNight
43%37%26%17%2
2399
November1st to 15thNight
38%310%20%21%4
2471
16th to endNight
49%39%22%13%1
2535
December1st to 15thNight
58%39%17%9%
2535
16th to endNight
63%49%15%6%
2763

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
29%14%34%11%7%1
135
16th to endDay
25%22%36%14%1
144
February1st to 15thDay
28%26%29%13%1
135
16th to endDay
25%19%42%13%1
100
March1st to 15thDay
25%20%32%18%1
153
16th to endDay
19%23%31%15%8%1
288
April1st to 15thDay
18%23%23%20%11%2
270
16th to endDay
17%19%25%17%12%8%
270
May1st to 15thDay
22%19%25%18%9%5%
288
16th to endDay
19%15%22%20%12%9%
331
June1st to 15thDay
9%12%17%30%22%7%
380
16th to endDay
12%16%24%26%14%5%
495
July1st to 15thDay
13%11%20%26%17%10%
475
16th to endDay
9%9%9%25%23%22%
334
August1st to 15thDay
9%7%11%24%23%23%
313
16th to endDay
6%7%10%25%30%19%
332
September1st to 15thDay
10%6%16%19%30%15%
315
16th to endDay
15%7%14%14%29%17%
314
October1st to 15thDay
13%9%22%24%21%8%
315
16th to endDay
14%8%36%25%13%1
240
November1st to 15thDay
17%11%28%22%13%6%
135
16th to endDay
18%17%40%19%4
135
December1st to 15thDay
15%24%37%11%9%
135
16th to endDay
31%20%39%9%
144
January1st to 15thNight
18%25%29%20%5%
946
16th to endNight
21%24%28%22%2
832
February1st to 15thNight
23%25%26%23%1
764
16th to endNight
22%25%27%23%1
659
March1st to 15thNight
19%23%29%21%5%
720
16th to endNight
17%23%27%23%7%
768
April1st to 15thNight
15%23%29%22%9%
566
16th to endNight
15%21%26%26%10%1
540
May1st to 15thNight
18%21%24%23%11%
540
16th to endNight
11%19%18%28%18%3
563
June1st to 15thNight
7%17%14%37%20%2
540
16th to endNight
5%16%18%33%23%1
540
July1st to 15thNight
11%12%13%31%27%3
510
16th to endNight
7%17%6%29%32%5%
564
August1st to 15thNight
7%9%11%32%33%4
539
16th to endNight
48%9%31%38%7%
573
September1st to 15thNight
11%10%12%27%32%5%
657
16th to endNight
11%11%13%25%32%5%
717
October1st to 15thNight
10%12%20%28%23%4
720
16th to endNight
16%15%27%25%13%1
768
November1st to 15thNight
15%20%23%22%16%1
760
16th to endNight
21%21%25%21%9%
780
December1st to 15thNight
22%22%25%21%7%
780
16th to endNight
24%26%27%18%3
891
Page generated at 2018-02-23 11:21:29. Version ac04

Copyright 2018 A. Danko


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