Okie-Tex Star Party
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Okie-Tex Star Party clear sky chart from 2005-11-06 to 2024-03-28.

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
48%
24640
30%
80025
17%
24540
60%
24540
41%
40371

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
46%
944
33%
4311
17%
926
59%
926
31%
2103
January11th to 20thNight
47%
942
34%
4284
19%
924
59%
924
35%
1833
January21st to endNight
48%
828
25%
4144
22%
814
63%
814
32%
1761
February1st to 10thNight
40%
760
33%
2280
15%
760
56%
760
41%
1207
February11th to 20thNight
31%
744
30%
2218
12%
740
48%
740
37%
1228
February21st to endNight
33%
628
38%
1884
13%
628
56%
628
47%
927
March1st to 10thNight
37%
760
34%
2280
12%
760
55%
760
44%
1145
March11th to 20thNight
40%
725
27%
2236
14%
725
52%
725
39%
1173
March21st to endNight
26%
615
34%
2050
11%
615
52%
615
37%
1030
April1st to 10thNight
28%
540
33%
1800
14%
540
53%
540
43%
846
April11th to 20thNight
28%
533
27%
1777
11%
533
50%
533
35%
926
April21st to endNight
36%
540
25%
1800
16%
540
53%
540
35%
934
May1st to 10thNight
40%
540
29%
1638
17%
540
59%
540
40%
870
May11th to 20thNight
40%
531
21%
1593
13%
531
51%
531
36%
900
May21st to endNight
35%
582
22%
1708
9%
582
49%
582
39%
943
June1st to 10thNight
49%
540
22%
1440
13%
540
57%
540
43%
814
June11th to 20thNight
44%
540
29%
1440
14%
540
56%
540
55%
731
June21st to endNight
52%
540
24%
1440
15%
540
60%
540
42%
842
July1st to 10thNight
65%
525
23%
1400
16%
525
70%
525
44%
802
July11th to 20thNight
72%
522
26%
1392
20%
522
75%
522
51%
754
July21st to endNight
62%
591
18%
1556
16%
558
63%
558
33%
962
August1st to 10thNight
68%
537
17%
1779
16%
534
72%
534
34%
1000
August11th to 20thNight
68%
534
22%
1778
25%
534
72%
534
35%
970
August21st to endNight
67%
594
26%
1980
28%
594
71%
594
41%
1014
September1st to 10thNight
67%
540
30%
1800
27%
540
75%
540
43%
896
September11th to 20thNight
54%
540
33%
1926
26%
540
67%
540
41%
941
September21st to endNight
55%
540
37%
1980
28%
540
70%
540
45%
889
October1st to 10thNight
48%
540
34%
1980
24%
540
62%
540
38%
974
October11th to 20thNight
54%
684
40%
2124
21%
684
69%
684
59%
928
October21st to endNight
53%
902
37%
2486
18%
902
63%
902
53%
1262
November1st to 10thNight
58%
925
37%
2405
17%
925
68%
925
61%
1188
November11th to 20thNight
52%
950
42%
2470
19%
950
64%
950
60%
1222
November21st to endNight
51%
950
36%
2470
18%
950
61%
950
49%
1332
December1st to 10thNight
50%
950
35%
2470
17%
950
61%
950
49%
1333
December11th to 20thNight
47%
948
35%
3022
18%
948
58%
948
44%
1523
December21st to endNight
39%
1036
23%
4684
16%
1026
53%
1026
29%
2168

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
5%42332445%8%60%
78942
Night
5%42342445%7%59%
81117
TransparencyDay
24%39%24%27%14%
78653
Night
25%39%24%26%13%
80930
SeeingDay
8%8%27%33%20%6%
14497
Night
7%7%34%39%13%1
24669

By Month

Percentage Cloud Cover SW (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
48%25%423336%60%
2538
11th to 20thDay
241443446%6%61%
2576
21st to endDay
5%5%234235%6%7%60%
3239
February1st to 10thDay
37%34434447%58%
1900
11th to 20thDay
35%26%5%33446%58%
1849
21st to endDay
3423323346%66%
1570
March1st to 10thDay
35%25%32435%7%60%
1900
11th to 20thDay
8%41332345%6%61%
1938
21st to endDay
6%5%2432345%6%59%
2461
April1st to 10thDay
5%31332345%7%65%
2160
11th to 20thDay
7%42442445%6%57%
2131
21st to endDay
7%5%234235%5%9%56%
2160
May1st to 10thDay
7%4233245%47%58%
2322
11th to 20thDay
8%4245%2445%9%55%
2302
21st to endDay
5%423425%5%6%10%56%
2564
June1st to 10thDay
4213325%5%8%10%57%
2520
11th to 20thDay
321222446%8%64%
2520
21st to endDay
44244345%6%9%55%
2520
July1st to 10thDay
5%323435%6%6%9%54%
2520
11th to 20thDay
23133346%7%10%59%
2520
21st to endDay
5%323426%7%8%11%48%
2668
August1st to 10thDay
4223436%6%7%12%52%
2149
11th to 20thDay
6%324435%6%8%9%49%
2123
21st to endDay
43134245%7%10%58%
2376
September1st to 10thDay
8%21342445%7%59%
2160
11th to 20thDay
7%31432345%6%62%
2034
21st to endDay
5%312324436%68%
1980
October1st to 10thDay
8%314323347%62%
1980
11th to 20thDay
5%32221123476%
1832
21st to endDay
7%41222233470%
1850
November1st to 10thDay
3213212335%75%
1673
11th to 20thDay
3322312336%71%
1710
21st to endDay
5%6%23312345%65%
1710
December1st to 10thDay
25%3432345%7%63%
1710
11th to 20thDay
442332336%6%64%
1983
21st to endDay
46%2432345%7%61%
2794
January1st to 10thNight
35%246%45%45%6%56%
4417
11th to 20thNight
35%234245%5%7%61%
4424
21st to endNight
45%2432345%7%61%
4425
February1st to 10thNight
45%45%424347%59%
2280
11th to 20thNight
46%25%5%35%5%5%7%53%
2218
21st to endNight
5%422323447%65%
1884
March1st to 10thNight
45%23323449%61%
2280
11th to 20thNight
7%42442435%6%59%
2236
21st to endNight
5%5%2342445%7%59%
2050
April1st to 10thNight
5%41232435%8%62%
1800
11th to 20thNight
7%42442446%7%55%
1777
21st to endNight
10%423324447%56%
1800
May1st to 10thNight
7%423324448%59%
1638
11th to 20thNight
9%5%234335%6%8%51%
1593
21st to endNight
8%323335%5%6%8%54%
1707
June1st to 10thNight
4324435%5%6%11%54%
1440
11th to 20thNight
22122245%7%10%63%
1440
21st to endNight
5%4345%35%5%7%11%50%
1440
July1st to 10thNight
4314336%6%8%11%51%
1440
11th to 20thNight
3313435%5%9%11%53%
1440
21st to endNight
8%5%26%6%45%6%8%12%41%
1648
August1st to 10thNight
5%325%5%46%7%8%12%43%
1789
11th to 20thNight
8%413435%5%8%10%49%
1778
21st to endNight
4313435%6%7%10%55%
1980
September1st to 10thNight
6%41333346%8%59%
1800
11th to 20thNight
7%42232445%7%61%
1926
21st to endNight
5%31332345%5%66%
1980
October1st to 10thNight
10%41232345%6%60%
1980
11th to 20thNight
431221223477%
2124
21st to endNight
6%413212345%68%
2486
November1st to 10thNight
3312213346%72%
2405
11th to 20thNight
241321334474%
2470
21st to endNight
45%13323346%64%
2470
December1st to 10thNight
35%24423347%63%
2470
11th to 20thNight
442342335%7%63%
3209
21st to endNight
3425%5%345%5%6%58%
4873

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
29%1427%32%7%
2539
11th to 20thDay
25%111%26%28%11%
2576
21st to endDay
26%18%29%29%7%
3239
February1st to 10thDay
28%28%22%25%14%
1900
11th to 20thDay
28%36%23%26%14%
1859
21st to endDay
20%2321%31%22%
1570
March1st to 10thDay
25%26%19%27%20%
1900
11th to 20thDay
25%25%24%31%13%
1938
21st to endDay
27%36%25%27%12%
2461
April1st to 10thDay
20%37%22%30%18%
2160
11th to 20thDay
28%26%24%24%16%
2134
21st to endDay
27%28%26%27%9%
2160
May1st to 10thDay
26%39%24%24%13%
2322
11th to 20thDay
28%412%28%21%7%
2306
21st to endDay
23%414%23%22%14%
2564
June1st to 10thDay
22%416%26%21%11%
2520
11th to 20thDay
18%38%22%26%23%
2520
21st to endDay
25%39%25%22%16%
2520
July1st to 10thDay
28%5%10%21%24%11%
2451
11th to 20thDay
20%5%11%26%27%10%
2445
21st to endDay
28%6%18%29%17%2
2520
August1st to 10thDay
24%6%18%29%15%8%
2136
11th to 20thDay
29%6%11%24%21%10%
2123
21st to endDay
21%5%12%25%26%11%
2376
September1st to 10thDay
25%310%23%22%17%
2160
11th to 20thDay
23%27%22%26%19%
2034
21st to endDay
20%26%20%36%17%
1980
October1st to 10thDay
24%38%21%29%15%
1980
11th to 20thDay
16%15%15%37%26%
1832
21st to endDay
20%25%20%32%21%
1850
November1st to 10thDay
14%25%22%33%24%
1673
11th to 20thDay
17%2326%36%16%
1710
21st to endDay
24%15%16%29%24%
1710
December1st to 10thDay
22%310%28%26%13%
1710
11th to 20thDay
23%2422%35%14%
1981
21st to endDay
25%17%25%26%16%
2794
January1st to 10thNight
30%1430%27%7%
4417
11th to 20thNight
25%111%27%26%10%
4424
21st to endNight
25%111%25%30%6%
4425
February1st to 10thNight
27%28%21%30%11%
2280
11th to 20thNight
30%36%23%25%12%
2218
21st to endNight
22%2222%33%19%
1884
March1st to 10thNight
23%25%22%30%18%
2280
11th to 20thNight
27%27%24%26%13%
2236
21st to endNight
27%29%24%25%13%
2050
April1st to 10thNight
21%37%24%28%18%
1800
11th to 20thNight
28%49%23%22%14%
1777
21st to endNight
29%312%25%20%11%
1800
May1st to 10thNight
26%49%26%22%13%
1638
11th to 20thNight
30%5%17%22%17%9%
1594
21st to endNight
27%5%17%17%17%17%
1708
June1st to 10thNight
25%5%19%26%13%11%
1440
11th to 20thNight
17%5%14%23%20%22%
1440
21st to endNight
29%411%25%19%13%
1440
July1st to 10thNight
26%6%16%23%21%8%
1400
11th to 20thNight
23%416%26%23%8%
1392
21st to endNight
36%5%20%24%13%2
1556
August1st to 10thNight
30%7%21%24%12%6%
1779
11th to 20thNight
30%5%17%26%16%6%
1778
21st to endNight
25%6%13%25%24%8%
1980
September1st to 10thNight
24%5%14%23%21%13%
1800
11th to 20thNight
24%410%21%24%17%
1926
21st to endNight
21%36%22%33%15%
1980
October1st to 10thNight
26%39%21%25%16%
1980
11th to 20thNight
15%26%17%35%26%
2124
21st to endNight
21%2422%31%19%
2486
November1st to 10thNight
16%26%21%32%24%
2405
11th to 20thNight
16%1325%37%17%
2470
21st to endNight
23%25%18%29%23%
2470
December1st to 10thNight
23%28%29%27%11%
2470
11th to 20thNight
23%25%20%38%12%
3210
21st to endNight
29%16%23%29%11%
4873

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
7%6%28%40%16%3
270
11th to 20thDay
9%9%34%30%13%5%
270
21st to endDay
411%28%35%19%3
297
February1st to 10thDay
7%11%41%25%11%3
270
11th to 20thDay
5%10%43%30%10%3
270
21st to endDay
7%14%44%27%7%1
225
March1st to 10thDay
6%10%37%34%11%2
270
11th to 20thDay
14%9%31%29%14%3
275
21st to endDay
14%19%36%21%8%1
491
April1st to 10thDay
7%19%39%25%9%2
420
11th to 20thDay
10%21%38%22%7%1
412
21st to endDay
15%18%36%23%6%2
420
May1st to 10thDay
9%12%31%32%15%2
585
11th to 20thDay
11%9%29%31%17%4
625
21st to endDay
7%8%38%33%11%2
679
June1st to 10thDay
6%7%23%33%23%7%
630
11th to 20thDay
5%5%30%37%19%4
630
21st to endDay
7%425%37%23%5%
630
July1st to 10thDay
5%116%38%31%10%
621
11th to 20thDay
3210%38%37%10%
618
21st to endDay
6%17%33%41%11%
682
August1st to 10thDay
4214%33%32%14%
447
11th to 20thDay
4220%38%30%7%
437
21st to endDay
5%213%42%27%11%
495
September1st to 10thDay
7%119%36%26%10%
450
11th to 20thDay
6%19%38%25%11%
324
21st to endDay
9%418%31%28%9%
270
October1st to 10thDay
13%7%24%29%20%8%
270
11th to 20thDay
4429%35%17%10%
270
21st to endDay
12%6%28%27%20%6%
297
November1st to 10thDay
6%9%29%31%21%3
270
11th to 20thDay
7%10%21%35%20%7%
270
21st to endDay
12%12%28%25%16%7%
270
December1st to 10thDay
38%31%39%15%4
270
11th to 20thDay
10%7%33%33%15%2
270
21st to endDay
10%10%38%31%10%
297
January1st to 10thNight
5%7%37%39%11%1
950
11th to 20thNight
6%9%35%37%11%2
944
21st to endNight
6%5%36%40%13%1
836
February1st to 10thNight
7%8%41%34%10%
760
11th to 20thNight
7%8%50%28%6%1
744
21st to endNight
9%8%49%30%4
628
March1st to 10thNight
6%11%42%34%6%1
760
11th to 20thNight
10%11%35%34%9%
725
21st to endNight
7%14%50%25%4
615
April1st to 10thNight
8%11%49%28%4
540
11th to 20thNight
10%12%47%27%4
533
21st to endNight
12%10%40%32%7%
540
May1st to 10thNight
8%10%39%37%6%
540
11th to 20thNight
12%6%38%31%12%1
531
21st to endNight
8%8%45%30%8%1
584
June1st to 10thNight
46%34%43%12%1
540
11th to 20thNight
2446%38%9%
540
21st to endNight
5%431%45%14%
540
July1st to 10thNight
4220%51%22%1
525
11th to 20thNight
4214%55%24%1
522
21st to endNight
9%214%45%28%2
591
August1st to 10thNight
6%114%45%32%2
537
11th to 20thNight
10%213%51%23%1
534
21st to endNight
5%219%48%24%2
594
September1st to 10thNight
8%119%53%19%1
540
11th to 20thNight
10%130%42%15%2
540
21st to endNight
6%431%43%15%1
540
October1st to 10thNight
12%432%40%12%1
540
11th to 20thNight
5%5%32%43%13%2
684
21st to endNight
9%5%31%37%16%3
902
November1st to 10thNight
4430%46%14%2
925
11th to 20thNight
47%34%41%13%1
950
21st to endNight
7%7%31%39%14%2
950
December1st to 10thNight
5%7%34%41%11%1
950
11th to 20thNight
6%7%36%40%10%1
950
21st to endNight
8%10%38%35%8%1
1045
Page generated at 2024-03-24 22:37:00. Version ac07

Copyright © 2024 Attilla Danko.


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