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 2005-11-06 to 2024-01-13.

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%
24137
26%
74282
17%
24076
52%
24076
32%
42994

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
29%
949
27%
2458
10%
946
40%
946
31%
1526
January11th to 20thNight
27%
915
26%
2379
9%
915
38%
915
29%
1510
January21st to endNight
30%
990
32%
2574
12%
990
42%
990
32%
1570
February1st to 10thNight
23%
900
20%
2340
6%
900
32%
900
25%
1568
February11th to 20thNight
23%
766
20%
2161
7%
762
32%
762
23%
1400
February21st to endNight
20%
503
27%
1687
9%
503
37%
503
20%
1022
March1st to 10thNight
30%
540
24%
1980
14%
540
42%
540
22%
1174
March11th to 20thNight
26%
540
21%
1980
13%
540
38%
540
20%
1207
March21st to endNight
25%
594
22%
2178
11%
594
40%
594
21%
1302
April1st to 10thNight
26%
540
23%
1962
14%
540
41%
540
22%
1133
April11th to 20thNight
32%
533
25%
1775
17%
533
45%
533
27%
1020
April21st to endNight
29%
540
23%
1746
12%
540
45%
540
27%
1044
May1st to 10thNight
36%
540
23%
1620
15%
540
48%
540
30%
993
May11th to 20thNight
41%
531
20%
1594
14%
531
51%
531
31%
974
May21st to endNight
45%
584
23%
1746
16%
582
57%
582
31%
1060
June1st to 10thNight
66%
540
23%
1620
21%
540
71%
540
41%
883
June11th to 20thNight
58%
540
25%
1620
22%
540
64%
540
45%
859
June21st to endNight
69%
540
28%
1620
27%
540
75%
540
53%
800
July1st to 10thNight
71%
525
22%
1575
22%
525
75%
525
39%
891
July11th to 20thNight
79%
522
29%
1566
32%
522
83%
522
58%
725
July21st to endNight
82%
591
29%
1673
34%
558
83%
558
50%
838
August1st to 10thNight
80%
537
27%
1601
30%
534
83%
534
49%
806
August11th to 20thNight
75%
534
32%
1600
35%
534
77%
534
42%
871
August21st to endNight
76%
594
25%
1966
29%
594
77%
594
41%
1008
September1st to 10thNight
74%
540
27%
1908
31%
540
77%
540
39%
953
September11th to 20thNight
65%
540
28%
1980
27%
540
71%
540
30%
1082
September21st to endNight
63%
540
35%
1980
32%
540
71%
540
41%
943
October1st to 10thNight
58%
656
34%
2096
26%
656
65%
656
42%
1073
October11th to 20thNight
41%
720
32%
2160
16%
720
53%
720
38%
1196
October21st to endNight
38%
792
31%
2376
17%
792
48%
792
32%
1394
November1st to 10thNight
39%
740
31%
2220
16%
740
53%
740
38%
1227
November11th to 20thNight
37%
831
30%
2351
15%
831
48%
831
35%
1351
November21st to endNight
31%
950
29%
2470
12%
950
43%
950
30%
1556
December1st to 10thNight
31%
950
28%
2470
11%
950
42%
950
31%
1551
December11th to 20thNight
28%
949
27%
2876
12%
948
37%
948
23%
1850
December21st to endNight
27%
1041
17%
4374
9%
1026
39%
1026
18%
2634

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
13%6%35%5%3445%7%46%
74964
Night
11%6%2442345%7%52%
74806
TransparencyDay
38%5%10%23%19%5%
74689
Night
33%410%23%22%7%
74601
SeeingDay
15%12%26%26%17%3
14173
Night
15%12%27%29%15%2
24143

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 10thDay
12%8%36%5%23346%49%
1707
11th to 20thDay
12%8%35%433445%49%
1638
21st to endDay
15%9%3432344449%
1782
February1st to 10thDay
19%10%46%5%3333440%
1620
11th to 20thDay
16%9%46%5%34346%40%
1702
21st to endDay
22%9%36%42334441%
1567
March1st to 10thDay
16%8%26%5%24335%45%
1980
11th to 20thDay
21%8%36%5%32345%40%
1980
21st to endDay
19%10%35%5%24346%39%
2178
April1st to 10thDay
14%7%36%5%34347%45%
1998
11th to 20thDay
17%5%35%5%34446%43%
2134
21st to endDay
19%7%36%5%33445%41%
2209
May1st to 10thDay
16%7%36%424446%43%
2340
11th to 20thDay
14%7%36%5%345%6%7%39%
2302
21st to endDay
13%7%47%7%46%46%7%36%
2531
June1st to 10thDay
9%5%35%5%35%5%6%9%46%
2340
11th to 20thDay
9%6%25%6%36%6%8%9%42%
2340
21st to endDay
6%3235%3446%9%55%
2340
July1st to 10thDay
9%5%25%5%47%6%9%12%37%
2340
11th to 20thDay
42245%36%5%6%10%52%
2340
21st to endDay
6%315%6%36%6%8%9%47%
2546
August1st to 10thDay
4325%7%5%5%6%7%8%49%
2328
11th to 20thDay
9%5%25%5%345%6%8%47%
2301
21st to endDay
7%425%5%36%5%7%9%47%
2390
September1st to 10thDay
11%5%245%35%45%7%50%
2048
11th to 20thDay
10%5%26%5%35%5%6%7%46%
1980
21st to endDay
9%3134345%46%57%
1980
October1st to 10thDay
8%426%4445%5%6%54%
1845
11th to 20thDay
14%6%2432333458%
1800
21st to endDay
18%6%24423235%51%
1980
November1st to 10thDay
11%7%35%423347%51%
1858
11th to 20thDay
11%6%2422334458%
1824
21st to endDay
17%6%24324325%51%
1710
December1st to 10thDay
16%6%2442335%6%48%
1710
11th to 20thDay
16%9%35%5%34346%43%
2161
21st to endDay
17%11%37%42445%6%37%
3135
January1st to 10thNight
11%6%35%423445%52%
2458
11th to 20thNight
12%7%35%423445%51%
2379
21st to endNight
13%7%35%323345%54%
2574
February1st to 10thNight
15%9%35%433345%46%
2340
11th to 20thNight
15%8%46%424246%45%
2161
21st to endNight
16%9%35%32234448%
1687
March1st to 10thNight
15%7%35%423446%46%
1980
11th to 20thNight
17%9%26%424445%46%
1980
21st to endNight
13%8%35%5%44336%47%
2178
April1st to 10thNight
12%7%24434347%49%
1962
11th to 20thNight
13%6%2432345%7%50%
1775
21st to endNight
14%6%25%42345%7%48%
1746
May1st to 10thNight
10%5%35%43445%8%47%
1620
11th to 20thNight
12%5%244335%5%10%47%
1593
21st to endNight
10%4345%345%6%11%46%
1745
June1st to 10thNight
5%324435%5%5%9%56%
1620
11th to 20thNight
5%32342446%9%59%
1620
21st to endNight
421232345%10%64%
1620
July1st to 10thNight
6%325%435%6%7%11%50%
1620
11th to 20thNight
221232346%10%66%
1620
21st to endNight
22233245%7%11%59%
1772
August1st to 10thNight
3212435%5%6%10%58%
1611
11th to 20thNight
6%4245%245%6%9%55%
1600
21st to endNight
44135%245%6%11%56%
1966
September1st to 10thNight
6%42432445%7%58%
1908
11th to 20thNight
10%4235%35%6%6%7%51%
1980
21st to endNight
7%313423347%62%
1980
October1st to 10thNight
7%424333348%60%
2096
11th to 20thNight
14%423313345%59%
2160
21st to endNight
18%5%2422223455%
2376
November1st to 10thNight
10%434323346%58%
2220
11th to 20thNight
8%6%25%423336%58%
2351
21st to endNight
16%7%24223345%51%
2470
December1st to 10thNight
14%7%25%32335%6%51%
2470
11th to 20thNight
13%7%47%6%2333448%
3036
21st to endNight
17%9%35%434345%44%
4532

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
38%38%24%22%5%
1708
11th to 20thDay
38%47%24%23%3
1638
21st to endDay
39%36%22%23%6%
1782
February1st to 10thDay
49%38%15%20%4
1620
11th to 20thDay
47%47%20%18%5%
1712
21st to endDay
49%25%15%21%8%
1567
March1st to 10thDay
43%38%17%18%11%
1980
11th to 20thDay
49%36%20%16%6%
1980
21st to endDay
48%48%22%15%3
2178
April1st to 10thDay
41%410%21%18%5%
1998
11th to 20thDay
43%5%8%22%17%5%
2134
21st to endDay
46%5%9%19%18%3
2209
May1st to 10thDay
43%5%11%21%17%3
2340
11th to 20thDay
43%6%13%23%14%1
2306
21st to endDay
47%7%12%21%13%1
2531
June1st to 10thDay
34%8%16%27%14%2
2340
11th to 20thDay
36%8%13%24%17%1
2340
21st to endDay
27%7%12%29%22%3
2340
July1st to 10thDay
35%11%18%23%12%1
2276
11th to 20thDay
25%8%13%32%20%3
2271
21st to endDay
29%9%17%31%14%
2405
August1st to 10thDay
30%7%16%28%18%1
2314
11th to 20thDay
34%7%14%25%17%3
2301
21st to endDay
31%7%16%28%15%3
2390
September1st to 10thDay
34%6%9%24%20%8%
2048
11th to 20thDay
35%7%11%21%19%7%
1980
21st to endDay
29%5%10%21%27%9%
1980
October1st to 10thDay
32%5%10%19%23%11%
1845
11th to 20thDay
33%35%15%31%13%
1800
21st to endDay
39%37%18%23%9%
1980
November1st to 10thDay
34%47%24%24%7%
1858
11th to 20thDay
30%38%24%26%8%
1824
21st to endDay
39%26%20%26%7%
1710
December1st to 10thDay
38%39%25%19%5%
1710
11th to 20thDay
44%35%20%22%6%
2159
21st to endDay
47%47%20%19%4
3135
January1st to 10thNight
35%38%20%28%6%
2458
11th to 20thNight
37%39%20%25%6%
2379
21st to endNight
34%35%22%27%10%
2574
February1st to 10thNight
43%49%20%18%6%
2340
11th to 20thNight
43%36%22%21%5%
2161
21st to endNight
41%37%17%21%10%
1687
March1st to 10thNight
40%47%17%20%12%
1980
11th to 20thNight
43%48%19%19%7%
1980
21st to endNight
41%49%22%20%4
2178
April1st to 10thNight
37%410%20%19%10%
1962
11th to 20thNight
35%5%9%24%18%10%
1775
21st to endNight
37%410%24%22%2
1746
May1st to 10thNight
36%5%11%22%17%7%
1620
11th to 20thNight
33%9%15%27%15%2
1594
21st to endNight
34%7%15%27%15%2
1746
June1st to 10thNight
24%7%16%30%19%4
1620
11th to 20thNight
23%6%13%32%23%3
1620
21st to endNight
17%6%12%30%29%5%
1620
July1st to 10thNight
26%8%16%29%18%2
1575
11th to 20thNight
14%5%16%36%25%4
1566
21st to endNight
18%7%19%34%21%1
1673
August1st to 10thNight
19%6%17%33%22%3
1601
11th to 20thNight
25%6%13%29%24%3
1600
21st to endNight
23%7%15%30%21%4
1966
September1st to 10thNight
24%6%12%26%23%9%
1908
11th to 20thNight
30%8%10%22%22%9%
1980
21st to endNight
24%47%24%30%11%
1980
October1st to 10thNight
25%411%24%22%14%
2096
11th to 20thNight
30%36%16%28%17%
2160
21st to endNight
36%25%20%25%12%
2376
November1st to 10thNight
29%48%24%25%11%
2220
11th to 20thNight
30%38%21%26%11%
2351
21st to endNight
37%36%20%27%7%
2470
December1st to 10thNight
36%410%21%22%8%
2470
11th to 20thNight
42%35%16%25%8%
3037
21st to endNight
42%38%21%20%6%
4532

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
23%22%35%16%4
270
11th to 20thDay
26%26%34%11%3
246
21st to endDay
20%29%30%15%6%
264
February1st to 10thDay
33%18%33%12%4
240
11th to 20thDay
31%26%33%8%1
240
21st to endDay
34%28%29%6%3
198
March1st to 10thDay
26%26%31%15%1
240
11th to 20thDay
34%26%27%10%3
240
21st to endDay
27%26%38%7%3
264
April1st to 10thDay
22%25%38%10%4
258
11th to 20thDay
27%19%32%16%6%
412
21st to endDay
24%22%32%16%6%1
469
May1st to 10thDay
17%18%41%18%5%
603
11th to 20thDay
18%12%35%22%12%1
625
21st to endDay
13%11%35%21%16%3
679
June1st to 10thDay
9%6%23%36%21%5%
630
11th to 20thDay
8%6%29%36%18%4
630
21st to endDay
5%5%24%38%23%5%
630
July1st to 10thDay
9%415%35%31%7%
621
11th to 20thDay
2215%38%35%7%
618
21st to endDay
4111%39%35%10%
684
August1st to 10thDay
7%113%43%33%4
626
11th to 20thDay
9%316%41%27%4
615
21st to endDay
6%110%35%38%11%
509
September1st to 10thDay
7%211%34%39%7%
338
11th to 20thDay
4318%41%26%8%
270
21st to endDay
14%5%21%35%21%4
270
October1st to 10thDay
49%39%30%15%3
270
11th to 20thDay
17%14%36%26%6%1
270
21st to endDay
30%15%25%24%6%
297
November1st to 10thDay
14%17%40%20%8%1
270
11th to 20thDay
18%22%31%23%6%1
270
21st to endDay
26%22%31%16%41
270
December1st to 10thDay
23%22%30%19%41
270
11th to 20thDay
26%23%34%12%4
270
21st to endDay
22%29%33%13%3
297
January1st to 10thNight
18%16%33%26%6%
950
11th to 20thNight
20%18%31%25%5%
915
21st to endNight
18%17%32%28%5%
990
February1st to 10thNight
23%20%31%22%4
900
11th to 20thNight
23%21%31%22%3
766
21st to endNight
24%21%33%19%3
503
March1st to 10thNight
22%15%31%27%5%
540
11th to 20thNight
22%16%33%24%5%
540
21st to endNight
19%19%36%20%6%
594
April1st to 10thNight
16%20%34%24%6%
540
11th to 20thNight
17%17%32%26%8%
533
21st to endNight
17%16%35%22%8%1
540
May1st to 10thNight
11%14%36%30%9%
540
11th to 20thNight
13%9%34%30%13%2
531
21st to endNight
10%7%32%29%20%2
584
June1st to 10thNight
5%319%40%30%3
540
11th to 20thNight
6%228%41%21%1
540
21st to endNight
3322%37%31%4
540
July1st to 10thNight
6%113%36%39%6%
525
11th to 20thNight
313%39%39%5%
522
21st to endNight
318%39%43%7%
591
August1st to 10thNight
2112%42%39%5%
537
11th to 20thNight
7%110%41%35%5%
534
21st to endNight
5%211%36%41%6%
594
September1st to 10thNight
8%111%40%37%4
540
11th to 20thNight
11%314%34%34%4
540
21st to endNight
8%321%33%32%4
540
October1st to 10thNight
8%425%33%26%3
656
11th to 20thNight
15%8%31%30%15%1
720
21st to endNight
23%9%27%26%14%1
792
November1st to 10thNight
12%10%37%31%10%1
740
11th to 20thNight
14%16%30%30%10%
831
21st to endNight
22%17%29%24%9%
950
December1st to 10thNight
20%15%31%28%6%
950
11th to 20thNight
22%15%32%27%4
950
21st to endNight
21%19%30%24%6%
1045
Page generated at 2024-01-10 09:16:12. Version ac07

Copyright 2024 Attilla Danko


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