Oklahoma City
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Oklahoma City 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
38%
16436
29%
48890
15%
16390
52%
16390
37%
26562

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
30%
974
32%
2522
11%
970
44%
970
40%
1410
January16th to endNight
30%
1040
36%
2704
12%
1040
47%
1040
41%
1490
February1st to 15thNight
27%
848
25%
2376
8%
844
38%
844
32%
1384
February16th to endNight
24%
660
30%
1978
9%
660
40%
660
28%
1130
March1st to 15thNight
26%
568
27%
2008
11%
568
45%
568
26%
1119
March16th to endNight
21%
576
21%
2112
9%
576
37%
576
24%
1197
April1st to 15thNight
19%
539
24%
1974
9%
539
41%
539
27%
1015
April16th to endNight
27%
540
27%
1622
13%
540
45%
540
32%
936
May1st to 15thNight
27%
540
26%
1620
12%
540
46%
540
31%
950
May16th to endNight
41%
563
28%
1684
20%
561
55%
561
39%
914
June1st to 15thNight
44%
540
22%
1620
13%
540
56%
540
44%
838
June16th to endNight
50%
540
27%
1620
17%
540
61%
540
50%
813
July1st to 15thNight
57%
510
21%
1530
17%
510
64%
510
43%
821
July16th to endNight
77%
564
32%
1594
32%
531
83%
531
56%
756
August1st to 15thNight
71%
539
29%
1610
31%
536
76%
536
48%
818
August16th to endNight
67%
573
30%
1831
30%
573
74%
573
45%
911
September1st to 15thNight
53%
540
25%
1980
23%
540
62%
540
33%
1029
September16th to endNight
50%
537
34%
1980
23%
537
67%
537
37%
981
October1st to 15thNight
40%
609
32%
2049
20%
609
53%
609
36%
1061
October16th to endNight
39%
768
38%
2304
16%
768
55%
768
46%
1118
November1st to 15thNight
36%
878
29%
2398
11%
878
49%
878
42%
1301
November16th to endNight
32%
975
35%
2535
14%
975
45%
975
38%
1447
December1st to 15thNight
32%
975
31%
2535
10%
975
46%
975
37%
1474
December16th to endNight
30%
1040
31%
2704
12%
1040
44%
1040
32%
1649

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
8%424424447%52%
49362
Night
8%413323346%57%
49086
Cloud CoverDay
8%5%24323447%52%
49360
Night
8%413323346%57%
49086
TransparencyDay
31%410%25%22%5%
49060
Night
27%39%25%25%8%
48891
SeeingDay
10%11%31%29%14%2
6203
Night
10%12%34%29%11%1
16437

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 15thDay
8%6%22323336%55%
1746
16th to endDay
8%5%24312335%59%
1872
February1st to 15thDay
8%7%35%32333453%
1827
16th to endDay
11%5%44322345%51%
1642
March1st to 15thDay
11%6%34423346%47%
1950
16th to endDay
12%8%35%323335%47%
2112
April1st to 15thDay
9%425%423346%52%
1974
16th to endDay
13%424424447%45%
2336
May1st to 15thDay
14%6%24323336%46%
2331
16th to endDay
8%6%35%5%3445%8%44%
2430
June1st to 15thDay
6%42442446%8%52%
2340
16th to endDay
6%213435%5%49%55%
2340
July1st to 15thDay
7%423436%5%7%9%45%
2340
16th to endDay
4212325%5%6%10%53%
2466
August1st to 15thDay
43135%246%7%9%50%
2340
16th to endDay
6%214335%6%6%9%50%
2368
September1st to 15thDay
12%315%42445%6%48%
1980
16th to endDay
7%314324447%55%
1980
October1st to 15thDay
11%41222223460%
1898
16th to endDay
6%31332333465%
1920
November1st to 15thDay
6%41222235%6%60%
1788
16th to endDay
8%42321223462%
1755
December1st to 15thDay
8%6%34322346%53%
1755
16th to endDay
11%8%3433324449%
1872
January1st to 15thNight
7%414313345%61%
2522
16th to endNight
7%32321334463%
2704
February1st to 15thNight
10%6%3431233455%
2366
16th to endNight
11%42332335%6%53%
1978
March1st to 15thNight
9%6%15%424435%52%
2008
16th to endNight
12%5%25%323446%50%
2112
April1st to 15thNight
11%41332335%7%54%
1974
16th to endNight
12%41431335%6%53%
1622
May1st to 15thNight
9%4245%2335%6%53%
1619
16th to endNight
7%31332336%9%54%
1683
June1st to 15thNight
5%212224449%60%
1620
16th to endNight
42222345%10%61%
1620
July1st to 15thNight
4213436%5%6%10%51%
1620
16th to endNight
21112135%5%11%62%
1702
August1st to 15thNight
22133246%7%10%54%
1620
16th to endNight
32133245%6%10%56%
1831
September1st to 15thNight
9%5%33313337%55%
1980
16th to endNight
7%41431335%6%57%
1980
October1st to 15thNight
9%413323345%58%
2049
16th to endNight
5%312222345%67%
2304
November1st to 15thNight
5%314322445%62%
2398
16th to endNight
8%5%2332223460%
2535
December1st to 15thNight
9%413323347%56%
2535
16th to endNight
12%7%23312336%53%
2704

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
8%6%13324335%56%
1746
16th to endDay
8%5%24312335%59%
1872
February1st to 15thDay
8%7%45%32333453%
1827
16th to endDay
11%5%35%322345%51%
1642
March1st to 15thDay
12%6%34423346%47%
1950
16th to endDay
12%9%34323335%47%
2110
April1st to 15thDay
9%425%433346%52%
1974
16th to endDay
13%5%25%4245%5%6%45%
2336
May1st to 15thDay
14%6%25%323346%46%
2331
16th to endDay
8%6%25%5%3445%8%44%
2430
June1st to 15thDay
6%42442446%8%52%
2340
16th to endDay
6%213435%5%49%54%
2340
July1st to 15thDay
7%413436%5%6%10%45%
2340
16th to endDay
4212325%6%6%10%53%
2466
August1st to 15thDay
43135%246%8%9%50%
2340
16th to endDay
6%214335%6%6%9%50%
2368
September1st to 15thDay
12%315%43435%6%48%
1980
16th to endDay
7%314424446%55%
1980
October1st to 15thDay
11%41321233460%
1898
16th to endDay
6%31332233465%
1920
November1st to 15thDay
7%31222335%6%60%
1788
16th to endDay
8%5%1321223462%
1755
December1st to 15thDay
9%6%25%422346%53%
1755
16th to endDay
11%9%24333245%49%
1872
January1st to 15thNight
7%413313345%61%
2522
16th to endNight
7%32331234463%
2704
February1st to 15thNight
10%6%3432233455%
2366
16th to endNight
11%42432335%6%53%
1978
March1st to 15thNight
9%6%24324435%52%
2008
16th to endNight
12%5%25%323346%50%
2112
April1st to 15thNight
11%313323348%54%
1974
16th to endNight
12%414313346%53%
1622
May1st to 15thNight
9%424423346%52%
1619
16th to endNight
7%31332337%8%54%
1683
June1st to 15thNight
5%212224449%60%
1620
16th to endNight
421222345%10%61%
1620
July1st to 15thNight
4213435%6%6%10%51%
1620
16th to endNight
31131346%10%62%
1702
August1st to 15thNight
22133246%7%10%55%
1620
16th to endNight
321332447%10%56%
1831
September1st to 15thNight
9%5%23413246%55%
1980
16th to endNight
7%41432335%6%57%
1980
October1st to 15thNight
10%41342334458%
2049
16th to endNight
5%312212335%67%
2304
November1st to 15thNight
5%314322345%62%
2398
16th to endNight
8%42432223460%
2535
December1st to 15thNight
10%413222346%56%
2535
16th to endNight
12%7%23322336%53%
2704

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
31%28%27%25%4
1747
16th to endDay
28%26%27%28%7%
1872
February1st to 15thDay
34%28%26%22%4
1828
16th to endDay
35%26%25%23%6%
1642
March1st to 15thDay
37%37%23%20%7%
1950
16th to endDay
39%311%23%18%4
2112
April1st to 15thDay
33%411%25%19%6%
1974
16th to endDay
37%48%22%21%4
2336
May1st to 15thDay
39%39%20%22%3
2331
16th to endDay
38%5%13%25%16%1
2434
June1st to 15thDay
28%5%16%27%19%3
2340
16th to endDay
26%414%24%24%5%
2340
July1st to 15thDay
31%6%15%27%17%1
2201
16th to endDay
23%5%13%30%23%2
2311
August1st to 15thDay
26%5%15%25%18%8%
2326
16th to endDay
29%412%29%18%5%
2368
September1st to 15thDay
34%5%8%24%19%8%
1980
16th to endDay
29%37%26%27%6%
1980
October1st to 15thDay
27%210%24%25%9%
1898
16th to endDay
24%37%22%31%11%
1920
November1st to 15thDay
23%39%27%26%9%
1788
16th to endDay
25%26%26%29%10%
1755
December1st to 15thDay
32%210%27%22%3
1755
16th to endDay
38%29%19%24%5%
1872
January1st to 15thNight
25%27%26%30%6%
2522
16th to endNight
24%26%24%31%9%
2704
February1st to 15thNight
32%28%25%23%6%
2376
16th to endNight
32%36%25%23%8%
1978
March1st to 15thNight
34%37%22%21%11%
2008
16th to endNight
35%410%24%19%5%
2112
April1st to 15thNight
29%411%23%21%10%
1974
16th to endNight
31%410%24%20%9%
1622
May1st to 15thNight
34%310%21%22%8%
1620
16th to endNight
26%415%30%18%4
1685
June1st to 15thNight
22%5%16%30%20%4
1620
16th to endNight
20%412%29%25%8%
1620
July1st to 15thNight
25%5%14%29%22%3
1530
16th to endNight
16%412%32%29%5%
1594
August1st to 15thNight
20%415%26%24%8%
1610
16th to endNight
22%412%29%23%7%
1831
September1st to 15thNight
31%29%23%21%12%
1980
16th to endNight
27%37%25%27%9%
1980
October1st to 15thNight
28%311%21%23%12%
2049
16th to endNight
20%26%22%35%13%
2304
November1st to 15thNight
24%39%22%29%11%
2398
16th to endNight
27%25%23%30%10%
2535
December1st to 15thNight
28%39%25%25%7%
2535
16th to endNight
34%28%21%25%7%
2704

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
14%23%43%14%3
135
16th to endDay
7%32%42%11%42
144
February1st to 15thDay
10%29%48%7%3
135
16th to endDay
18%38%39%5%
100
March1st to 15thDay
16%28%50%31
90
16th to endDay
11%27%40%13%7%
96
April1st to 15thDay
11%21%41%23%1
93
16th to endDay
19%22%36%16%6%
446
May1st to 15thDay
14%18%41%16%6%1
468
16th to endDay
15%11%32%25%11%1
517
June1st to 15thDay
8%5%35%34%13%2
495
16th to endDay
7%330%39%16%3
495
July1st to 15thDay
9%123%44%18%3
475
16th to endDay
4111%47%29%4
515
August1st to 15thDay
6%117%41%28%4
493
16th to endDay
8%121%40%23%4
408
September1st to 15thDay
2220%40%26%6%
135
16th to endDay
10%233%30%17%5%
135
October1st to 15thDay
10%11%40%22%11%3
135
16th to endDay
415%43%28%8%
144
November1st to 15thDay
19%10%41%17%8%3
135
16th to endDay
18%31%29%17%2
135
December1st to 15thDay
6%25%46%15%4
135
16th to endDay
18%30%34%15%1
144
January1st to 15thNight
9%18%39%27%5%
975
16th to endNight
9%17%40%26%5%
1040
February1st to 15thNight
14%17%38%25%3
848
16th to endNight
15%21%37%21%3
660
March1st to 15thNight
13%17%40%25%3
568
16th to endNight
16%18%41%18%4
576
April1st to 15thNight
14%19%44%17%3
539
16th to endNight
14%16%40%22%5%
540
May1st to 15thNight
12%14%42%19%10%
540
16th to endNight
9%8%37%29%14%1
563
June1st to 15thNight
7%5%38%33%12%2
540
16th to endNight
4239%36%15%1
540
July1st to 15thNight
5%30%42%19%1
510
16th to endNight
215%56%21%3
564
August1st to 15thNight
3117%48%25%3
539
16th to endNight
321%41%29%2
573
September1st to 15thNight
11%225%36%22%2
540
16th to endNight
10%431%30%19%3
537
October1st to 15thNight
14%8%32%26%16%2
609
16th to endNight
8%12%38%28%11%1
768
November1st to 15thNight
9%13%37%25%12%1
878
16th to endNight
12%18%33%26%8%
975
December1st to 15thNight
12%16%35%27%6%
975
16th to endNight
18%16%33%26%6%
1040
Page generated at 2018-02-23 10:21:33. Version ac04

Copyright 2018 A. Danko


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