Kiamichi Skies Observatory
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Kiamichi Skies Observatory clear sky chart from 2005-11-05 to 2019-06-02.

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%
17984
26%
53800
17%
17938
52%
17938
33%
31145

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
31%
1049
27%
2717
11%
1045
41%
1045
31%
1687
January16th to endNight
31%
1120
31%
2912
11%
1120
43%
1120
33%
1756
February1st to 15thNight
24%
1012
21%
2660
7%
1008
33%
1008
27%
1723
February16th to endNight
23%
667
26%
2137
9%
667
37%
667
22%
1283
March1st to 15thNight
28%
630
24%
2310
14%
630
41%
630
21%
1396
March16th to endNight
29%
672
20%
2464
12%
672
41%
672
22%
1454
April1st to 15thNight
28%
629
24%
2223
15%
629
42%
629
24%
1278
April16th to endNight
33%
624
23%
2036
13%
624
48%
624
29%
1176
May1st to 15thNight
36%
630
22%
1890
14%
630
49%
630
29%
1178
May16th to endNight
45%
659
25%
1973
18%
657
57%
657
36%
1131
June1st to 15thNight
62%
588
24%
1764
22%
588
68%
588
44%
938
June16th to endNight
64%
585
25%
1755
22%
585
71%
585
49%
901
July1st to 15thNight
71%
555
21%
1665
22%
555
75%
555
42%
902
July16th to endNight
83%
612
28%
1738
33%
579
84%
579
50%
870
August1st to 15thNight
82%
575
30%
1717
34%
572
83%
572
49%
869
August16th to endNight
71%
621
24%
1996
27%
621
73%
621
37%
1094
September1st to 15thNight
67%
585
26%
2093
28%
585
72%
585
33%
1124
September16th to endNight
65%
582
33%
2145
30%
582
74%
582
37%
1072
October1st to 15thNight
48%
734
30%
2294
21%
734
55%
734
36%
1278
October16th to endNight
43%
832
34%
2496
18%
832
56%
832
40%
1323
November1st to 15thNight
40%
820
29%
2460
15%
820
52%
820
35%
1380
November16th to endNight
33%
1033
30%
2713
13%
1033
44%
1033
33%
1647
December1st to 15thNight
30%
1050
27%
2730
11%
1050
40%
1050
30%
1751
December16th to endNight
29%
1120
24%
2912
9%
1120
38%
1120
26%
1934

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
12%6%25%42445%6%45%
54533
Night
10%5%24323347%52%
53995
TransparencyDay
38%5%10%22%18%4
54233
Night
32%410%24%21%6%
53800
SeeingDay
13%11%25%26%18%4
7882
Night
14%11%27%28%15%1
17985

By Month

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
13%8%25%312345%49%
1881
16th to endDay
12%7%3432334450%
2016
February1st to 15thDay
14%9%35%423335%42%
1874
16th to endDay
20%8%35%42323440%
1907
March1st to 15thDay
16%7%25%423335%44%
2310
16th to endDay
18%9%35%5%23335%38%
2462
April1st to 15thDay
15%5%35%5%23346%44%
2385
16th to endDay
17%6%35%5%33345%41%
2525
May1st to 15thDay
17%7%36%424445%40%
2721
16th to endDay
11%5%36%6%35%46%7%39%
2846
June1st to 15thDay
9%4245%25%46%9%45%
2549
16th to endDay
7%4244345%7%8%47%
2535
July1st to 15thDay
9%425%5%46%6%7%11%37%
2535
16th to endDay
5%2145%36%6%7%9%45%
2674
August1st to 15thDay
5%3145%346%7%8%48%
2486
16th to endDay
8%425%5%35%5%6%8%43%
2558
September1st to 15thDay
13%5%15%5%35%5%5%6%41%
2194
16th to endDay
10%3144245%5%6%52%
2145
October1st to 15thDay
13%6%25%33434447%
1982
16th to endDay
11%41432222458%
2080
November1st to 15thDay
11%6%25%423336%51%
2058
16th to endDay
13%6%1321333455%
1904
December1st to 15thDay
16%8%24212346%46%
1890
16th to endDay
16%9%35%413345%42%
2016
January1st to 15thNight
11%5%25%423445%51%
2717
16th to endNight
10%6%2431233455%
2912
February1st to 15thNight
12%7%25%423335%47%
2650
16th to endNight
13%7%35%313245%48%
2137
March1st to 15thNight
15%8%25%423335%45%
2310
16th to endNight
12%6%25%433346%47%
2464
April1st to 15thNight
11%5%24424347%49%
2223
16th to endNight
12%5%2442335%6%50%
2036
May1st to 15thNight
10%5%25%33345%7%47%
1889
16th to endNight
7%32442345%11%50%
1971
June1st to 15thNight
431342445%8%58%
1764
16th to endNight
5%21221335%10%60%
1755
July1st to 15thNight
5%2143245%7%10%51%
1755
16th to endNight
21122245%6%11%59%
1846
August1st to 15thNight
321232446%9%59%
1727
16th to endNight
44145%245%5%10%50%
1996
September1st to 15thNight
9%423324446%53%
2093
16th to endNight
7%31342345%8%56%
2145
October1st to 15thNight
10%424323246%55%
2294
16th to endNight
12%31321223461%
2496
November1st to 15thNight
8%424324347%55%
2460
16th to endNight
13%6%2321222455%
2713
December1st to 15thNight
15%6%34323345%49%
2730
16th to endNight
14%8%36%423335%44%
2912

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
37%38%23%21%4
1882
16th to endDay
38%26%24%22%5%
2016
February1st to 15thDay
44%48%19%19%3
1875
16th to endDay
48%26%18%17%6%
1907
March1st to 15thDay
43%38%18%17%7%
2310
16th to endDay
49%36%22%14%3
2464
April1st to 15thDay
41%410%21%17%5%
2385
16th to endDay
45%48%18%18%3
2525
May1st to 15thDay
45%6%11%16%17%3
2721
16th to endDay
42%6%12%22%15%
2850
June1st to 15thDay
34%6%14%27%15%1
2549
16th to endDay
31%7%13%24%20%2
2535
July1st to 15thDay
36%9%16%26%11%
2396
16th to endDay
29%8%16%28%15%1
2519
August1st to 15thDay
29%6%14%25%19%2
2472
16th to endDay
36%7%16%24%12%2
2558
September1st to 15thDay
41%6%9%19%14%8%
2194
16th to endDay
31%5%11%22%21%7%
2145
October1st to 15thDay
39%49%17%19%10%
1982
16th to endDay
31%27%19%28%10%
2080
November1st to 15thDay
35%39%25%20%6%
2058
16th to endDay
34%26%23%27%6%
1904
December1st to 15thDay
40%28%24%18%4
1890
16th to endDay
44%27%22%18%4
2016
January1st to 15thNight
34%39%19%28%4
2717
16th to endNight
32%26%22%26%8%
2912
February1st to 15thNight
39%38%23%18%5%
2660
16th to endNight
39%38%23%19%7%
2137
March1st to 15thNight
41%37%17%20%9%
2310
16th to endNight
39%410%22%18%4
2464
April1st to 15thNight
35%410%21%18%9%
2223
16th to endNight
34%49%23%21%5%
2036
May1st to 15thNight
36%6%12%21%16%7%
1890
16th to endNight
28%6%15%29%15%2
1973
June1st to 15thNight
23%5%12%32%23%3
1764
16th to endNight
19%6%13%28%26%4
1755
July1st to 15thNight
24%6%17%32%17%1
1665
16th to endNight
18%6%17%33%22%2
1738
August1st to 15thNight
19%6%16%28%24%4
1717
16th to endNight
28%6%14%28%19%3
1996
September1st to 15thNight
30%5%11%23%19%9%
2093
16th to endNight
25%5%8%25%25%8%
2145
October1st to 15thNight
30%410%22%19%12%
2294
16th to endNight
27%26%20%28%14%
2496
November1st to 15thNight
29%39%25%22%9%
2460
16th to endNight
34%26%21%27%7%
2713
December1st to 15thNight
38%29%20%21%6%
2730
16th to endNight
42%37%20%19%6%
2912

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
21%22%34%15%6%
180
16th to endDay
13%28%33%15%8%
192
February1st to 15thDay
22%24%36%13%2
180
16th to endDay
32%27%31%5%2
159
March1st to 15thDay
23%31%27%15%1
180
16th to endDay
18%25%36%13%5%
192
April1st to 15thDay
21%19%39%14%4
264
16th to endDay
24%17%29%18%8%1
417
May1st to 15thDay
18%14%37%19%8%1
618
16th to endDay
12%13%35%20%15%2
677
June1st to 15thDay
8%423%36%22%4
576
16th to endDay
7%5%22%38%20%5%
570
July1st to 15thDay
8%317%35%27%8%
550
16th to endDay
410%32%41%11%
595
August1st to 15thDay
9%11%38%35%5%
549
16th to endDay
7%214%38%31%6%
470
September1st to 15thDay
7%19%33%39%8%
229
16th to endDay
15%217%35%20%8%
180
October1st to 15thDay
13%9%31%30%12%2
180
16th to endDay
17%9%28%36%7%
192
November1st to 15thDay
17%15%35%22%7%2
180
16th to endDay
20%23%28%20%5%2
180
December1st to 15thDay
19%25%33%16%31
180
16th to endDay
20%29%31%15%3
192
January1st to 15thNight
18%16%31%27%6%
1050
16th to endNight
15%18%31%28%5%
1120
February1st to 15thNight
19%20%33%23%3
1012
16th to endNight
20%20%33%21%3
667
March1st to 15thNight
21%13%34%25%4
630
16th to endNight
14%17%36%23%8%
672
April1st to 15thNight
14%19%35%25%5%
629
16th to endNight
16%12%35%24%9%
624
May1st to 15thNight
12%12%35%28%10%
630
16th to endNight
8%6%35%28%18%2
659
June1st to 15thNight
5%223%39%26%2
588
16th to endNight
5%224%38%25%4
585
July1st to 15thNight
5%15%38%35%4
555
16th to endNight
37%35%44%8%
612
August1st to 15thNight
38%42%37%7%
575
16th to endNight
6%112%38%36%5%
621
September1st to 15thNight
11%211%34%36%4
585
16th to endNight
9%120%30%33%5%
582
October1st to 15thNight
12%5%28%27%23%2
734
16th to endNight
15%7%29%28%17%1
832
November1st to 15thNight
11%14%32%29%12%
820
16th to endNight
19%16%29%23%10%
1033
December1st to 15thNight
21%14%30%26%6%
1050
16th to endNight
20%17%29%25%6%
1120
Page generated at 2019-06-02 18:43:06. Version ac04

Copyright 2019 A. Danko


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