Cleburne State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Cleburne State Park clear sky chart from 2005-11-05 to 2017-09-22.

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
50%
15567
30%
46982
20%
15520
60%
15520
40%
25260

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
39%
898
30%
2327
14%
895
48%
895
39%
1363
January16th to endNight
37%
960
33%
2496
13%
960
49%
960
39%
1454
February1st to 15thNight
33%
713
29%
2114
12%
706
47%
706
34%
1194
February16th to endNight
26%
632
32%
1894
10%
632
44%
632
36%
1035
March1st to 15thNight
32%
548
28%
1988
15%
548
48%
548
28%
1104
March16th to endNight
34%
576
26%
2112
15%
576
50%
576
32%
1092
April1st to 15thNight
31%
539
27%
1977
13%
539
51%
539
33%
993
April16th to endNight
33%
540
29%
1709
15%
540
52%
540
36%
948
May1st to 15thNight
35%
539
24%
1620
15%
539
48%
539
34%
941
May16th to endNight
49%
562
25%
1684
20%
561
60%
561
40%
919
June1st to 15thNight
66%
540
24%
1620
24%
540
72%
540
55%
773
June16th to endNight
71%
540
26%
1620
29%
540
75%
540
45%
846
July1st to 15thNight
79%
510
26%
1530
28%
510
81%
510
49%
779
July16th to endNight
86%
564
31%
1594
37%
531
88%
531
55%
760
August1st to 15thNight
88%
539
37%
1610
42%
536
89%
536
60%
729
August16th to endNight
77%
573
28%
1931
33%
573
79%
573
39%
1004
September1st to 15thNight
70%
540
23%
1980
26%
540
72%
540
35%
1039
September16th to endNight
71%
513
33%
1891
32%
513
77%
513
39%
918
October1st to 15thNight
61%
539
36%
1859
30%
539
69%
539
45%
879
October16th to endNight
54%
704
37%
2112
22%
704
64%
704
47%
1052
November1st to 15thNight
52%
738
32%
2138
18%
738
61%
738
45%
1134
November16th to endNight
42%
900
33%
2340
16%
900
52%
900
41%
1367
December1st to 15thNight
39%
900
32%
2340
14%
900
49%
900
38%
1403
December16th to endNight
39%
960
28%
2496
12%
960
48%
960
35%
1534

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
7%313323345%60%
47894
Night
7%312212336%64%
47185
Cloud CoverDay
9%42442445%6%52%
47892
Night
8%313323347%57%
47185
TransparencyDay
31%39%23%22%9%
47592
Night
27%39%23%23%12%
46990
SeeingDay
9%5%19%30%27%8%
5550
Night
11%6%27%35%17%1
15571

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
10%5%2321222263%
1611
16th to endDay
7%41231233466%
1730
February1st to 15thDay
9%32431222463%
1750
16th to endDay
11%313111235%64%
1580
March1st to 15thDay
15%41321333455%
1971
16th to endDay
7%314312235%64%
2112
April1st to 15thDay
7%313322345%61%
1971
16th to endDay
9%31332333461%
2247
May1st to 15thDay
11%413423345%55%
2331
16th to endDay
7%42442345%7%52%
2430
June1st to 15thDay
3213424447%63%
2340
16th to endDay
3213423348%63%
2340
July1st to 15thDay
421332445%7%60%
2340
16th to endDay
32332346%7%61%
2466
August1st to 15thDay
2123245%6%7%64%
2340
16th to endDay
6%4145%45%5%6%8%47%
2267
September1st to 15thDay
9%2145%245%5%6%52%
1980
16th to endDay
6%31431345%6%58%
1881
October1st to 15thDay
9%313213336%62%
1760
16th to endDay
6%31321112470%
1760
November1st to 15thDay
8%31321233463%
1719
16th to endDay
10%3231222366%
1620
December1st to 15thDay
15%6%1321223357%
1620
16th to endDay
10%5%2431233458%
1728
January1st to 15thNight
10%41221123463%
2327
16th to endNight
8%21221123368%
2496
February1st to 15thNight
11%41331122364%
2111
16th to endNight
9%32311235%66%
1894
March1st to 15thNight
12%42331223459%
1988
16th to endNight
5%312222235%67%
2112
April1st to 15thNight
5%313212236%65%
1977
16th to endNight
9%22321235%64%
1709
May1st to 15thNight
6%31331225%6%61%
1619
16th to endNight
5%21221336%8%62%
1683
June1st to 15thNight
212211349%70%
1620
16th to endNight
112212348%69%
1620
July1st to 15thNight
3112213249%67%
1620
16th to endNight
11121235%9%69%
1702
August1st to 15thNight
111212348%72%
1620
16th to endNight
431343445%9%55%
1931
September1st to 15thNight
8%312423447%57%
1980
16th to endNight
5%313423348%60%
1891
October1st to 15thNight
7%22212336%66%
1859
16th to endNight
7%2211133470%
2112
November1st to 15thNight
6%31321223368%
2138
16th to endNight
11%31221233464%
2340
December1st to 15thNight
12%5%13312235%59%
2340
16th to endNight
9%5%23213335%59%
2496

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%5%2431323356%
1611
16th to endDay
12%5%13313345%57%
1730
February1st to 15thDay
12%42432233456%
1750
16th to endDay
15%423211236%55%
1580
March1st to 15thDay
16%423424346%47%
1971
16th to endDay
12%5%24322246%52%
2110
April1st to 15thDay
9%424424437%52%
1971
16th to endDay
11%324324445%50%
2247
May1st to 15thDay
13%4245%2445%7%44%
2331
16th to endDay
10%5%25%4345%7%8%41%
2430
June1st to 15thDay
42144345%5%8%55%
2340
16th to endDay
6%3245%245%5%8%51%
2340
July1st to 15thDay
6%423435%5%7%8%49%
2340
16th to endDay
42135%35%6%6%10%50%
2466
August1st to 15thDay
212335%5%7%8%59%
2340
16th to endDay
7%3145%46%6%6%8%44%
2267
September1st to 15thDay
9%315%5%25%5%5%7%47%
1980
16th to endDay
7%31442445%7%55%
1881
October1st to 15thDay
9%31322345%6%57%
1760
16th to endDay
7%313211135%68%
1760
November1st to 15thDay
9%323322445%57%
1719
16th to endDay
12%32331222361%
1620
December1st to 15thDay
15%6%24213235%51%
1620
16th to endDay
14%6%2341233450%
1728
January1st to 15thNight
12%5%13312245%57%
2327
16th to endNight
12%413222335%58%
2496
February1st to 15thNight
12%5%2341223457%
2111
16th to endNight
12%422322246%57%
1894
March1st to 15thNight
14%423423346%50%
1988
16th to endNight
8%423323346%56%
2112
April1st to 15thNight
7%423323347%56%
1977
16th to endNight
10%313422347%55%
1709
May1st to 15thNight
9%32432345%8%50%
1619
16th to endNight
7%22231446%10%53%
1683
June1st to 15thNight
221221235%10%65%
1620
16th to endNight
222332445%10%58%
1620
July1st to 15thNight
422332345%11%57%
1620
16th to endNight
21131345%11%62%
1702
August1st to 15thNight
11221235%10%67%
1620
16th to endNight
431443446%10%51%
1931
September1st to 15thNight
9%31342345%8%52%
1980
16th to endNight
5%313423349%57%
1891
October1st to 15thNight
7%313213347%62%
1859
16th to endNight
9%2211234467%
2112
November1st to 15thNight
7%31332334462%
2138
16th to endNight
11%41331333459%
2340
December1st to 15thNight
13%5%23313236%54%
2340
16th to endNight
12%5%24313346%52%
2496

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
33%25%19%27%11%
1612
16th to endDay
30%26%18%28%13%
1730
February1st to 15thDay
33%25%19%25%13%
1751
16th to endDay
33%2421%24%14%
1580
March1st to 15thDay
39%37%16%23%10%
1971
16th to endDay
34%39%21%22%9%
2112
April1st to 15thDay
32%39%22%18%13%
1971
16th to endDay
34%37%21%23%9%
2247
May1st to 15thDay
39%49%18%18%9%
2331
16th to endDay
38%414%21%18%2
2434
June1st to 15thDay
25%5%11%28%23%5%
2340
16th to endDay
30%411%26%21%5%
2340
July1st to 15thDay
29%5%16%30%16%2
2201
16th to endDay
23%6%18%30%18%2
2311
August1st to 15thDay
19%5%14%32%23%4
2326
16th to endDay
33%6%14%26%16%2
2267
September1st to 15thDay
34%5%10%22%19%7%
1980
16th to endDay
27%39%23%25%10%
1881
October1st to 15thDay
27%29%23%19%16%
1760
16th to endDay
22%25%18%31%19%
1760
November1st to 15thDay
29%28%25%22%12%
1719
16th to endDay
30%2317%27%18%
1620
December1st to 15thDay
36%17%22%23%7%
1620
16th to endDay
37%25%21%24%8%
1728
January1st to 15thNight
30%26%17%27%16%
2327
16th to endNight
29%2417%26%18%
2496
February1st to 15thNight
32%26%14%26%18%
2121
16th to endNight
29%27%19%24%17%
1894
March1st to 15thNight
35%28%17%22%13%
1988
16th to endNight
29%411%21%26%7%
2112
April1st to 15thNight
27%39%22%20%15%
1977
16th to endNight
30%311%18%25%11%
1709
May1st to 15thNight
31%411%21%19%10%
1620
16th to endNight
27%418%24%20%4
1685
June1st to 15thNight
17%413%34%22%7%
1620
16th to endNight
22%6%12%28%24%6%
1620
July1st to 15thNight
21%414%37%18%3
1530
16th to endNight
14%6%18%35%21%2
1594
August1st to 15thNight
14%313%36%26%5%
1610
16th to endNight
26%415%31%17%4
1931
September1st to 15thNight
30%311%24%19%9%
1980
16th to endNight
25%38%24%24%13%
1891
October1st to 15thNight
22%310%25%20%17%
1859
16th to endNight
22%2418%28%24%
2112
November1st to 15thNight
25%26%24%25%15%
2138
16th to endNight
29%26%14%28%18%
2340
December1st to 15thNight
33%27%23%22%11%
2340
16th to endNight
34%27%19%22%12%
2496

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
18%6%35%28%7%2
90
16th to endDay
13%7%45%21%9%2
96
February1st to 15thDay
6%12%41%37%2
90
16th to endDay
14%8%45%20%8%1
81
March1st to 15thDay
24%20%24%21%7%2
90
16th to endDay
6%11%40%25%14%2
96
April1st to 15thDay
12%12%30%30%15%
90
16th to endDay
14%12%38%21%12%
357
May1st to 15thDay
15%10%37%25%8%1
468
16th to endDay
13%6%33%27%15%3
517
June1st to 15thDay
4215%41%29%5%
495
16th to endDay
6%210%39%31%9%
495
July1st to 15thDay
5%7%41%35%10%
475
16th to endDay
22325%48%17%
515
August1st to 15thDay
21429%47%15%
493
16th to endDay
14%27%29%34%12%
307
September1st to 15thDay
1120%48%26%
135
16th to endDay
5%120%45%25%
108
October1st to 15thDay
315%37%43%8%
90
16th to endDay
17%316%29%28%5%
96
November1st to 15thDay
18%6%22%34%14%3
90
16th to endDay
25%15%28%18%8%2
90
December1st to 15thDay
26%426%23%13%5%
90
16th to endDay
11%16%35%29%7%
96
January1st to 15thNight
15%10%30%35%8%
900
16th to endNight
15%9%34%33%7%
960
February1st to 15thNight
16%11%34%31%4
713
16th to endNight
15%11%44%25%2
632
March1st to 15thNight
16%10%36%29%6%
548
16th to endNight
9%11%42%31%5%
576
April1st to 15thNight
9%11%46%27%5%
539
16th to endNight
10%10%45%25%8%
540
May1st to 15thNight
10%9%41%30%7%
540
16th to endNight
8%334%35%15%2
563
June1st to 15thNight
422%48%21%2
540
16th to endNight
416%47%28%2
540
July1st to 15thNight
5%8%47%35%2
510
16th to endNight
3444%42%4
564
August1st to 15thNight
1341%47%5%
539
16th to endNight
6%1440%40%6%
573
September1st to 15thNight
10%17%39%38%2
540
16th to endNight
7%11%37%39%2
513
October1st to 15thNight
8%221%39%23%3
539
16th to endNight
9%427%36%19%1
704
November1st to 15thNight
8%5%30%36%18%1
738
16th to endNight
14%8%32%32%11%1
900
December1st to 15thNight
17%6%32%33%9%
900
16th to endNight
17%8%31%34%8%
960
Page generated at 2017-09-23 05:43:47. Version ac04

Copyright 2017 A. Danko


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