Fort Stockton
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Fort Stockton clear sky chart from 2005-11-06 to 2024-01-14.

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
52%
23805
33%
74410
21%
23753
65%
23753
47%
36327

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
49%
842
38%
2353
19%
841
63%
841
50%
1204
January11th to 20thNight
48%
736
36%
2208
20%
736
62%
736
46%
1110
January21st to endNight
45%
792
40%
2376
20%
792
64%
792
46%
1189
February1st to 10thNight
49%
720
38%
2160
21%
720
64%
720
50%
1056
February11th to 20thNight
38%
701
27%
2098
12%
700
51%
700
40%
1121
February21st to endNight
30%
592
35%
1776
11%
592
52%
592
47%
883
March1st to 10thNight
36%
720
32%
2160
11%
720
55%
720
42%
1114
March11th to 20thNight
37%
680
30%
2119
14%
680
52%
680
41%
1085
March21st to endNight
28%
594
40%
1980
16%
594
55%
594
47%
892
April1st to 10thNight
30%
540
37%
1800
16%
540
55%
540
42%
877
April11th to 20thNight
26%
533
34%
1777
13%
533
52%
533
43%
829
April21st to endNight
31%
540
39%
1800
18%
540
61%
540
50%
782
May1st to 10thNight
35%
540
31%
1800
18%
540
57%
540
49%
822
May11th to 20thNight
43%
531
29%
1649
20%
531
58%
531
46%
826
May21st to endNight
37%
583
28%
1745
13%
582
58%
582
48%
875
June1st to 10thNight
51%
540
27%
1620
18%
540
64%
540
53%
778
June11th to 20thNight
50%
540
30%
1620
20%
540
63%
540
52%
785
June21st to endNight
61%
540
29%
1620
24%
540
68%
540
55%
766
July1st to 10thNight
76%
525
23%
1575
22%
525
80%
525
47%
804
July11th to 20thNight
78%
522
32%
1713
33%
522
83%
522
54%
770
July21st to endNight
82%
591
32%
1859
36%
558
86%
558
56%
797
August1st to 10thNight
83%
537
34%
1779
39%
534
87%
534
60%
741
August11th to 20thNight
77%
534
27%
1778
31%
534
80%
534
41%
923
August21st to endNight
79%
594
26%
1980
28%
594
82%
594
41%
1033
September1st to 10thNight
72%
540
27%
1800
27%
540
75%
540
41%
926
September11th to 20thNight
71%
540
28%
1962
29%
540
76%
540
35%
1032
September21st to endNight
65%
540
31%
1980
28%
540
71%
540
40%
974
October1st to 10thNight
63%
540
34%
1980
29%
540
72%
540
43%
912
October11th to 20thNight
56%
556
40%
1996
29%
556
69%
556
44%
919
October21st to endNight
60%
792
40%
2376
23%
792
70%
792
55%
1117
November1st to 10thNight
58%
893
37%
2373
17%
893
68%
893
56%
1205
November11th to 20thNight
59%
950
33%
2470
16%
950
67%
950
56%
1280
November21st to endNight
50%
950
37%
2470
18%
950
60%
950
48%
1358
December1st to 10thNight
57%
950
38%
2470
20%
950
67%
950
51%
1339
December11th to 20thNight
47%
949
37%
2893
16%
948
61%
948
44%
1512
December21st to endNight
49%
1038
26%
4295
18%
1026
61%
1026
44%
1691

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%31332445%7%62%
74770
Night
5%31332345%8%63%
75014
TransparencyDay
21%5%9%18%25%22%
74514
Night
20%5%9%19%25%23%
74793
SeeingDay
6%5%21%36%24%8%
13650
Night
6%5%33%44%12%1
23820

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
6%423323347%63%
1827
11th to 20thDay
8%413212346%66%
1830
21st to endDay
6%424324345%62%
1980
February1st to 10thDay
4413323447%65%
1800
11th to 20thDay
7%5%23413346%62%
1749
21st to endDay
5%31332335%6%65%
1480
March1st to 10thDay
6%4245%235%6%9%54%
1800
11th to 20thDay
8%42442345%5%58%
1840
21st to endDay
3312323347%68%
2372
April1st to 10thDay
3313333447%65%
2160
11th to 20thDay
5%31332335%6%68%
2131
21st to endDay
5%212322445%69%
2160
May1st to 10thDay
5%31332345%6%66%
2160
11th to 20thDay
5%31333445%7%61%
2243
21st to endDay
42123245%7%9%60%
2531
June1st to 10thDay
21122235%6%8%68%
2340
11th to 20thDay
32222446%8%66%
2340
21st to endDay
42133345%6%9%61%
2340
July1st to 10thDay
4313435%6%8%12%51%
2340
11th to 20thDay
3223334448%65%
2183
21st to endDay
22234346%6%10%59%
2349
August1st to 10thDay
32123345%5%10%64%
2149
11th to 20thDay
5%325%6%37%7%8%10%45%
2123
21st to endDay
5%325%5%46%6%7%10%48%
2376
September1st to 10thDay
10%4145%45%5%6%8%48%
2160
11th to 20thDay
9%5%25%4346%7%9%46%
1995
21st to endDay
8%314425%45%6%58%
1980
October1st to 10thDay
5%3133245%47%62%
1980
11th to 20thDay
7%413323335%66%
1960
21st to endDay
5%412222235%73%
1980
November1st to 10thDay
8%312212335%70%
1686
11th to 20thDay
5%5%2332334466%
1710
21st to endDay
7%423424346%62%
1710
December1st to 10thDay
8%6%2331335%5%60%
1710
11th to 20thDay
33244245%5%7%61%
2161
21st to endDay
5%313212245%71%
3135
January1st to 10thNight
5%323423335%67%
2353
11th to 20thNight
8%41232345%6%62%
2208
21st to endNight
6%413323447%63%
2376
February1st to 10thNight
5%424212448%65%
2160
11th to 20thNight
7%5%1443445%6%58%
2098
21st to endNight
6%413413347%65%
1776
March1st to 10thNight
5%41432446%8%58%
2160
11th to 20thNight
7%42332445%7%60%
2119
21st to endNight
421321345%6%68%
1980
April1st to 10thNight
5%32333445%7%61%
1800
11th to 20thNight
5%31232445%7%64%
1777
21st to endNight
3112223446%72%
1800
May1st to 10thNight
421332435%8%66%
1800
11th to 20thNight
6%31332345%6%64%
1649
21st to endNight
32123145%7%8%62%
1745
June1st to 10thNight
3123335%7%10%62%
1620
11th to 20thNight
21133246%8%9%61%
1620
21st to endNight
31122245%6%10%62%
1620
July1st to 10thNight
3112435%5%6%12%58%
1620
11th to 20thNight
221132345%10%67%
1771
21st to endNight
11123235%7%11%65%
1969
August1st to 10thNight
211232335%11%68%
1790
11th to 20thNight
43144246%7%14%51%
1778
21st to endNight
33235%345%7%10%55%
1980
September1st to 10thNight
7%42342345%10%56%
1800
11th to 20thNight
6%3244245%7%11%52%
1962
21st to endNight
8%3133235%6%10%55%
1980
October1st to 10thNight
431232345%7%64%
1980
11th to 20thNight
8%212223446%65%
1996
21st to endNight
6%31322223472%
2376
November1st to 10thNight
8%31321233472%
2373
11th to 20thNight
4313323446%67%
2470
21st to endNight
6%424423446%62%
2470
December1st to 10thNight
8%412323447%63%
2470
11th to 20thNight
442443345%6%62%
3036
21st to endNight
4312312336%70%
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
22%46%15%31%23%
1828
11th to 20thDay
21%3416%32%25%
1830
21st to endDay
25%35%13%30%24%
1980
February1st to 10thDay
20%47%13%24%33%
1800
11th to 20thDay
24%46%15%22%29%
1759
21st to endDay
20%3412%26%35%
1480
March1st to 10thDay
26%5%7%15%23%24%
1800
11th to 20thDay
26%5%6%13%21%30%
1840
21st to endDay
17%36%14%26%34%
2372
April1st to 10thDay
19%5%7%11%25%34%
2160
11th to 20thDay
17%5%6%11%26%34%
2134
21st to endDay
17%47%14%25%34%
2160
May1st to 10thDay
19%46%11%25%35%
2160
11th to 20thDay
22%6%8%17%26%21%
2247
21st to endDay
18%7%12%18%21%23%
2531
June1st to 10thDay
12%6%12%24%28%18%
2340
11th to 20thDay
15%5%10%19%27%24%
2340
21st to endDay
20%6%11%21%24%19%
2340
July1st to 10thDay
24%9%17%28%18%4
2276
11th to 20thDay
18%6%10%25%31%11%
2118
21st to endDay
18%8%13%34%22%4
2219
August1st to 10thDay
15%6%12%30%31%6%
2136
11th to 20thDay
30%10%14%22%19%5%
2123
21st to endDay
28%11%16%20%17%8%
2376
September1st to 10thDay
32%8%12%18%17%13%
2160
11th to 20thDay
32%9%12%17%21%8%
1995
21st to endDay
25%7%9%18%26%15%
1980
October1st to 10thDay
19%7%11%21%21%20%
1980
11th to 20thDay
22%46%15%26%26%
1960
21st to endDay
16%35%13%32%31%
1980
November1st to 10thDay
18%36%17%30%26%
1686
11th to 20thDay
21%5%8%16%25%25%
1710
21st to endDay
25%36%16%25%25%
1710
December1st to 10thDay
26%5%7%18%25%19%
1710
11th to 20thDay
21%5%7%20%24%23%
2159
21st to endDay
17%3415%33%29%
3135
January1st to 10thNight
21%3413%34%25%
2353
11th to 20thNight
22%35%16%28%25%
2208
21st to endNight
22%45%14%28%27%
2376
February1st to 10thNight
20%37%12%26%32%
2160
11th to 20thNight
27%47%12%20%30%
2098
21st to endNight
21%35%9%23%39%
1776
March1st to 10thNight
23%46%17%22%27%
2160
11th to 20thNight
23%5%7%16%20%29%
2119
21st to endNight
17%48%15%23%33%
1980
April1st to 10thNight
22%5%6%12%22%33%
1800
11th to 20thNight
19%5%8%14%22%31%
1777
21st to endNight
14%5%7%19%25%30%
1800
May1st to 10thNight
17%5%8%16%23%31%
1800
11th to 20thNight
19%7%12%19%23%20%
1650
21st to endNight
16%8%17%23%21%15%
1746
June1st to 10thNight
15%7%14%25%28%11%
1620
11th to 20thNight
16%7%11%20%29%17%
1620
21st to endNight
15%6%14%23%24%18%
1620
July1st to 10thNight
18%9%18%33%18%4
1575
11th to 20thNight
14%6%10%26%31%12%
1713
21st to endNight
12%7%15%37%27%3
1859
August1st to 10thNight
13%410%34%33%6%
1779
11th to 20thNight
22%8%18%29%17%5%
1778
21st to endNight
22%9%16%27%19%8%
1980
September1st to 10thNight
24%6%15%25%17%13%
1800
11th to 20thNight
26%8%17%20%20%9%
1962
21st to endNight
22%7%12%22%22%16%
1980
October1st to 10thNight
18%8%14%19%22%20%
1980
11th to 20thNight
21%5%7%17%24%27%
1996
21st to endNight
18%26%13%30%32%
2376
November1st to 10thNight
18%3416%31%27%
2373
11th to 20thNight
18%47%18%26%27%
2470
21st to endNight
23%46%14%26%27%
2470
December1st to 10thNight
22%47%19%25%23%
2470
11th to 20thNight
23%46%17%26%25%
3037
21st to endNight
17%3416%33%27%
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
8%8%33%33%18%
270
11th to 20thDay
10%9%29%34%16%2
249
21st to endDay
6%11%34%30%16%2
264
February1st to 10thDay
6%10%27%32%21%4
240
11th to 20thDay
13%10%33%29%13%2
240
21st to endDay
8%11%39%32%9%1
198
March1st to 10thDay
10%5%34%37%14%
240
11th to 20thDay
10%9%36%28%14%3
240
21st to endDay
414%44%28%9%1
458
April1st to 10thDay
412%41%34%9%1
420
11th to 20thDay
6%13%46%26%8%1
412
21st to endDay
5%11%37%35%12%
420
May1st to 10thDay
48%36%35%15%1
423
11th to 20thDay
7%330%40%15%5%
566
21st to endDay
5%431%47%13%1
679
June1st to 10thDay
2119%47%27%5%
630
11th to 20thDay
2118%53%23%4
630
21st to endDay
3111%45%31%8%
630
July1st to 10thDay
5%6%36%36%17%
621
11th to 20thDay
2438%39%17%
465
21st to endDay
11440%41%14%
487
August1st to 10thDay
2333%40%21%
447
11th to 20thDay
5%26%29%33%25%
437
21st to endDay
5%16%27%39%22%
495
September1st to 10thDay
8%18%32%37%14%
450
11th to 20thDay
7%15%21%45%21%
285
21st to endDay
10%17%23%37%22%
270
October1st to 10thDay
8%210%33%34%13%
270
11th to 20thDay
11%210%36%30%10%
270
21st to endDay
9%5%20%27%27%12%
297
November1st to 10thDay
14%318%33%25%7%
270
11th to 20thDay
10%9%16%30%26%8%
270
21st to endDay
10%8%29%30%18%5%
270
December1st to 10thDay
11%6%20%40%20%3
270
11th to 20thDay
311%30%39%16%1
270
21st to endDay
8%6%31%36%16%2
297
January1st to 10thNight
8%435%44%9%1
845
11th to 20thNight
10%6%32%40%11%1
736
21st to endNight
7%7%38%39%9%
792
February1st to 10thNight
6%8%35%40%11%
720
11th to 20thNight
10%8%42%34%6%
704
21st to endNight
8%9%50%31%2
592
March1st to 10thNight
8%10%43%34%5%
720
11th to 20thNight
8%8%44%35%4
680
21st to endNight
5%11%54%26%4
594
April1st to 10thNight
49%55%29%3
540
11th to 20thNight
6%12%55%24%3
533
21st to endNight
212%53%29%3
540
May1st to 10thNight
5%7%51%35%3
540
11th to 20thNight
7%5%43%38%7%
531
21st to endNight
37%51%35%4
584
June1st to 10thNight
3341%49%4
540
11th to 20thNight
2144%47%5%
540
21st to endNight
3133%53%11%
540
July1st to 10thNight
415%62%18%1
525
11th to 20thNight
214%70%13%1
522
21st to endNight
1113%67%18%1
591
August1st to 10thNight
219%67%21%1
537
11th to 20thNight
5%19%50%33%2
534
21st to endNight
418%58%28%1
594
September1st to 10thNight
8%212%52%24%1
540
11th to 20thNight
6%113%58%22%1
540
21st to endNight
10%120%48%21%1
540
October1st to 10thNight
5%226%53%13%
540
11th to 20thNight
9%329%47%11%
556
21st to endNight
8%426%45%17%2
792
November1st to 10thNight
9%326%47%15%1
893
11th to 20thNight
4429%45%16%1
950
21st to endNight
8%5%32%40%13%1
950
December1st to 10thNight
9%326%45%15%1
950
11th to 20thNight
7%5%37%41%9%
950
21st to endNight
8%6%34%42%10%1
1045
Page generated at 2024-01-11 12:32:02. Version ac07

Copyright 2024 Attilla Danko


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