This page made possible by the sponsorship of: Mary Uetrecht.

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 2020-06-03.

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%
19206
19%
57616
12%
19162
44%
19162
21%
38489

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%
1092
13%
3103
6%
1087
26%
1087
12%
2419
January16th to endNight
19%
960
14%
3120
7%
960
27%
960
12%
2333
February1st to 15thNight
19%
883
13%
2712
6%
881
25%
881
12%
1993
February16th to endNight
19%
791
14%
2373
7%
791
26%
791
13%
1743
March1st to 15thNight
23%
900
16%
2621
8%
900
30%
900
17%
1847
March16th to endNight
26%
960
17%
2640
8%
960
34%
960
19%
1873
April1st to 15thNight
28%
708
18%
2281
11%
708
38%
708
19%
1529
April16th to endNight
31%
669
20%
2043
7%
669
43%
669
21%
1333
May1st to 15thNight
32%
675
15%
2025
7%
675
39%
675
19%
1401
May16th to endNight
45%
706
16%
2116
9%
705
51%
705
24%
1346
June1st to 15thNight
55%
637
19%
1833
14%
637
60%
637
32%
1077
June16th to endNight
54%
630
18%
1680
10%
630
59%
630
32%
1040
July1st to 15thNight
58%
600
19%
1600
14%
600
62%
600
33%
1001
July16th to endNight
61%
660
20%
1870
15%
627
70%
627
34%
1081
August1st to 15thNight
64%
620
25%
1850
20%
617
67%
617
34%
1066
August16th to endNight
68%
669
24%
2154
21%
669
73%
669
37%
1156
September1st to 15thNight
60%
766
27%
2236
22%
766
65%
766
35%
1296
September16th to endNight
55%
837
29%
2310
21%
837
60%
837
34%
1402
October1st to 15thNight
52%
840
29%
2352
22%
840
58%
840
33%
1402
October16th to endNight
36%
896
23%
2799
18%
896
46%
896
24%
1778
November1st to 15thNight
34%
880
23%
2861
16%
880
46%
880
24%
1760
November16th to endNight
28%
900
18%
2925
10%
900
38%
900
16%
2013
December1st to 15thNight
22%
900
12%
2925
7%
900
29%
900
13%
2155
December16th to endNight
18%
1027
14%
3187
7%
1027
26%
1027
11%
2445

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%7%36%5%3445%7%36%
58775
Night
15%7%36%5%24447%38%
57797
Cloud CoverDay
14%7%36%5%3445%7%36%
58784
Night
14%7%36%5%24447%38%
57802
TransparencyDay
46%5%11%21%13%2
58474
Night
45%410%22%14%2
57616
SeeingDay
18%14%24%21%14%7%
9256
Night
17%17%22%25%14%1
19208

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%25%
1819
16th to endDay
14%14%5%8%6%35%345%26%
2160
February1st to 15thDay
19%13%47%5%35%345%27%
2138
16th to endDay
19%11%49%5%24335%29%
1980
March1st to 15thDay
20%10%26%6%24447%29%
2319
16th to endDay
21%9%45%5%24445%30%
2640
April1st to 15thDay
17%8%35%5%3445%6%36%
2668
16th to endDay
19%6%36%5%25%346%36%
2850
May1st to 15thDay
21%6%25%6%35%45%6%32%
2916
16th to endDay
12%6%26%5%37%5%7%8%33%
3055
June1st to 15thDay
11%326%5%35%6%6%8%40%
2831
16th to endDay
10%5%25%5%46%6%5%8%40%
2940
July1st to 15thDay
10%5%26%6%35%5%6%8%38%
2940
16th to endDay
8%425%437%7%6%10%38%
2892
August1st to 15thDay
7%425%6%45%5%6%10%42%
2682
16th to endDay
8%4245%345%7%10%42%
2749
September1st to 15thDay
12%4345%3445%7%44%
2368
16th to endDay
14%424423446%48%
2310
October1st to 15thDay
11%5%15%5%3445%6%44%
2268
16th to endDay
17%7%24423346%42%
2128
November1st to 15thDay
11%8%36%424445%45%
1987
16th to endDay
16%11%37%5%23446%34%
2025
December1st to 15thDay
22%11%5%8%5%34345%25%
2025
16th to endDay
20%14%5%7%5%23446%24%
2085
January1st to 15thNight
19%11%5%9%6%4443425%
3103
16th to endNight
16%15%5%8%6%2433428%
3120
February1st to 15thNight
22%10%47%5%23335%29%
2710
16th to endNight
18%12%47%5%2445%6%27%
2373
March1st to 15thNight
17%9%35%6%34446%34%
2608
16th to endNight
19%8%36%424446%34%
2640
April1st to 15thNight
16%7%45%5%3445%6%37%
2281
16th to endNight
15%6%36%42445%8%38%
2043
May1st to 15thNight
17%6%35%5%35%447%35%
2025
16th to endNight
10%5%24435%6%5%10%40%
2114
June1st to 15thNight
6%41443445%10%49%
1833
16th to endNight
6%225%435%6%6%10%46%
1680
July1st to 15thNight
8%4245%3435%9%48%
1680
16th to endNight
7%325%43436%10%48%
1977
August1st to 15thNight
5%4244335%6%10%48%
1861
16th to endNight
6%31441345%10%53%
2154
September1st to 15thNight
11%41332435%7%51%
2236
16th to endNight
12%424424345%51%
2310
October1st to 15thNight
10%31442435%7%50%
2352
16th to endNight
17%6%35%423445%43%
2799
November1st to 15thNight
15%6%25%42345%6%44%
2861
16th to endNight
19%9%36%434445%34%
2925
December1st to 15thNight
20%11%5%8%42434429%
2925
16th to endNight
22%12%5%8%5%23445%25%
3187

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%34445%25%
1819
16th to endDay
14%12%6%8%7%36%346%26%
2160
February1st to 15thDay
19%12%47%5%34436%27%
2138
16th to endDay
18%11%49%5%24335%28%
1980
March1st to 15thDay
20%9%36%6%34447%29%
2329
16th to endDay
21%9%45%5%34445%30%
2639
April1st to 15thDay
17%7%35%5%3445%6%35%
2668
16th to endDay
18%6%25%5%34446%36%
2850
May1st to 15thDay
21%6%26%6%345%5%6%32%
2916
16th to endDay
12%6%26%6%36%6%6%9%32%
3055
June1st to 15thDay
11%426%5%25%6%6%9%40%
2831
16th to endDay
9%5%25%6%46%5%5%8%39%
2940
July1st to 15thDay
10%5%36%6%35%5%6%9%37%
2940
16th to endDay
8%425%447%6%7%10%38%
2892
August1st to 15thDay
7%425%6%36%5%7%9%42%
2682
16th to endDay
8%415%5%345%7%9%42%
2749
September1st to 15thDay
12%425%5%335%5%7%44%
2368
16th to endDay
14%5%24423446%47%
2310
October1st to 15thDay
11%5%25%5%3445%6%44%
2268
16th to endDay
17%7%25%5%23246%42%
2128
November1st to 15thDay
11%7%36%424336%45%
1987
16th to endDay
16%11%37%5%24346%34%
2025
December1st to 15thDay
22%10%5%8%6%24345%25%
2025
16th to endDay
20%13%5%7%5%34446%24%
2085
January1st to 15thNight
19%12%49%7%3443425%
3103
16th to endNight
16%14%5%9%5%2443428%
3120
February1st to 15thNight
21%10%48%5%33335%29%
2703
16th to endNight
18%12%47%5%245%5%6%27%
2373
March1st to 15thNight
16%9%35%6%34445%34%
2621
16th to endNight
19%8%35%5%24446%34%
2640
April1st to 15thNight
15%7%35%5%2445%6%37%
2281
16th to endNight
15%6%26%5%25%35%7%38%
2043
May1st to 15thNight
17%6%35%5%3445%8%35%
2024
16th to endNight
10%5%245%35%5%6%10%40%
2114
June1st to 15thNight
6%4244244411%49%
1833
16th to endNight
6%315%435%5%7%11%45%
1680
July1st to 15thNight
8%42443435%8%48%
1680
16th to endNight
7%42443446%9%48%
1977
August1st to 15thNight
5%325%4245%6%10%47%
1861
16th to endNight
5%32432436%9%54%
2154
September1st to 15thNight
11%41332445%6%51%
2236
16th to endNight
12%424423345%51%
2310
October1st to 15thNight
10%314434447%50%
2352
16th to endNight
16%6%34324345%43%
2799
November1st to 15thNight
15%5%25%42345%6%44%
2861
16th to endNight
18%9%36%5%24445%34%
2925
December1st to 15thNight
20%11%5%8%424345%29%
2925
16th to endNight
22%11%5%7%5%24445%25%
3187

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%49%15%10%
1820
16th to endDay
59%312%18%5%
2160
February1st to 15thDay
58%410%17%8%
2140
16th to endDay
58%39%19%8%1
1980
March1st to 15thDay
55%411%19%8%
2329
16th to endDay
55%410%19%9%
2640
April1st to 15thDay
48%410%22%12%1
2668
16th to endDay
48%39%21%13%4
2850
May1st to 15thDay
50%6%12%18%10%1
2916
16th to endDay
46%7%13%19%11%1
3059
June1st to 15thDay
38%6%12%23%16%1
2831
16th to endDay
40%7%12%22%15%3
2940
July1st to 15thDay
41%6%12%19%18%2
2791
16th to endDay
37%8%13%24%14%2
2736
August1st to 15thDay
35%5%14%25%16%2
2669
16th to endDay
34%7%12%24%15%4
2749
September1st to 15thDay
37%412%21%19%4
2368
16th to endDay
37%49%25%22%1
2310
October1st to 15thDay
38%5%8%25%19%3
2268
16th to endDay
44%29%24%17%1
2128
November1st to 15thDay
41%37%25%17%3
1987
16th to endDay
51%39%21%13%
2025
December1st to 15thDay
61%39%16%7%
2025
16th to endDay
60%49%16%6%
2085
January1st to 15thNight
62%36%16%9%
3103
16th to endNight
59%39%19%6%
3120
February1st to 15thNight
58%311%19%6%
2712
16th to endNight
55%411%18%7%1
2373
March1st to 15thNight
51%49%20%12%1
2621
16th to endNight
49%412%22%9%1
2640
April1st to 15thNight
46%49%22%14%2
2281
16th to endNight
43%411%19%14%6%
2043
May1st to 15thNight
47%5%12%21%10%2
2025
16th to endNight
37%8%16%21%13%3
2116
June1st to 15thNight
30%5%12%28%20%2
1833
16th to endNight
30%8%16%21%18%3
1680
July1st to 15thNight
33%6%12%23%19%5%
1600
16th to endNight
30%5%13%30%17%2
1870
August1st to 15thNight
29%6%14%29%18%2
1850
16th to endNight
26%5%13%28%20%4
2154
September1st to 15thNight
30%5%12%24%21%5%
2236
16th to endNight
34%38%24%26%2
2310
October1st to 15thNight
33%48%28%21%3
2352
16th to endNight
42%37%25%17%2
2799
November1st to 15thNight
40%311%20%19%3
2861
16th to endNight
51%39%21%12%1
2925
December1st to 15thNight
58%39%17%9%
2925
16th to endNight
61%49%16%7%
3187

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
31%15%34%12%5%
225
16th to endDay
25%20%33%16%4
240
February1st to 15thDay
35%25%24%11%2
225
16th to endDay
27%20%37%12%1
201
March1st to 15thDay
23%27%32%14%1
304
16th to endDay
25%21%29%15%6%
480
April1st to 15thDay
20%21%26%20%9%1
450
16th to endDay
22%19%24%17%10%5%
439
May1st to 15thDay
22%16%28%19%9%4
468
16th to endDay
19%12%25%22%12%7%
523
June1st to 15thDay
12%11%19%29%20%6%
518
16th to endDay
12%13%24%27%14%7%
645
July1st to 15thDay
11%8%17%25%21%15%
625
16th to endDay
10%7%12%26%25%17%
464
August1st to 15thDay
9%5%12%26%25%20%
418
16th to endDay
9%7%14%26%26%14%
460
September1st to 15thDay
12%5%14%23%31%13%
435
16th to endDay
17%7%16%17%27%14%
434
October1st to 15thDay
12%9%25%27%18%6%
435
16th to endDay
18%11%32%26%9%1
352
November1st to 15thDay
19%16%31%19%9%4
225
16th to endDay
23%14%38%20%4
225
December1st to 15thDay
20%25%35%12%7%
225
16th to endDay
28%17%35%12%5%
240
January1st to 15thNight
19%25%28%20%5%
1092
16th to endNight
23%23%27%21%3
960
February1st to 15thNight
25%23%26%21%2
884
16th to endNight
23%24%27%22%2
791
March1st to 15thNight
20%22%31%21%4
900
16th to endNight
21%21%26%22%7%
960
April1st to 15thNight
18%20%29%23%8%
708
16th to endNight
17%18%28%24%9%1
669
May1st to 15thNight
18%18%25%24%12%
675
16th to endNight
12%15%20%28%19%3
707
June1st to 15thNight
8%15%14%38%19%2
637
16th to endNight
6%14%17%33%24%2
630
July1st to 15thNight
10%11%12%29%31%5%
600
16th to endNight
8%14%8%29%33%5%
660
August1st to 15thNight
7%8%11%33%34%4
620
16th to endNight
5%7%12%32%35%6%
669
September1st to 15thNight
12%9%12%28%33%4
766
16th to endNight
12%9%14%28%30%4
837
October1st to 15thNight
11%10%20%31%22%3
840
16th to endNight
17%14%28%26%11%1
896
November1st to 15thNight
17%18%25%22%14%1
880
16th to endNight
22%20%25%23%9%
900
December1st to 15thNight
23%21%27%20%6%
900
16th to endNight
24%23%27%20%3
1027
Page generated at 2020-06-04 03:18:52. Version ac04

Copyright 2020 A. Danko


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