Comanche Springs
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Comanche Springs clear sky chart from 2005-11-05 to 2017-09-14.

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%
15650
32%
46918
20%
15605
63%
15605
44%
24173

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
46%
899
33%
2327
15%
895
58%
895
47%
1285
January16th to endNight
45%
889
38%
2425
18%
889
58%
889
50%
1272
February1st to 15thNight
41%
704
30%
2112
15%
700
54%
700
40%
1116
February16th to endNight
34%
632
34%
1894
12%
632
52%
632
41%
975
March1st to 15thNight
33%
649
30%
2089
14%
649
48%
649
35%
1122
March16th to endNight
36%
576
28%
2112
18%
576
51%
576
35%
1034
April1st to 15thNight
29%
539
29%
1849
14%
539
50%
539
35%
943
April16th to endNight
33%
540
33%
1731
16%
540
57%
540
42%
856
May1st to 15thNight
37%
539
28%
1620
17%
539
55%
539
41%
863
May16th to endNight
49%
562
29%
1684
21%
561
64%
561
45%
887
June1st to 15thNight
53%
540
23%
1620
16%
540
64%
540
48%
812
June16th to endNight
62%
540
27%
1620
26%
540
68%
540
50%
807
July1st to 15thNight
76%
510
22%
1530
24%
510
78%
510
45%
801
July16th to endNight
87%
564
34%
1594
39%
531
88%
531
56%
751
August1st to 15thNight
86%
539
33%
1688
40%
536
87%
536
54%
786
August16th to endNight
80%
573
29%
1910
34%
573
82%
573
45%
945
September1st to 15thNight
68%
537
24%
1928
27%
537
72%
537
31%
1069
September16th to endNight
69%
492
33%
1815
33%
492
74%
492
38%
895
October1st to 15thNight
55%
495
36%
1815
31%
495
65%
495
41%
857
October16th to endNight
56%
696
40%
2104
22%
696
68%
696
56%
974
November1st to 15thNight
53%
875
35%
2275
14%
875
64%
875
55%
1160
November16th to endNight
49%
900
37%
2340
16%
900
60%
900
50%
1245
December1st to 15thNight
48%
900
36%
2340
18%
900
59%
900
47%
1269
December16th to endNight
42%
960
34%
2496
15%
960
54%
960
40%
1449

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%313323346%58%
47791
Night
6%313323347%61%
47114
Cloud CoverDay
7%313323346%59%
47789
Night
6%313323347%61%
47114
TransparencyDay
25%38%23%26%11%
47489
Night
23%38%21%27%15%
46919
SeeingDay
7%421%34%25%7%
5617
Night
7%5%29%38%16%1
15653

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
7%423213236%62%
1611
16th to endDay
6%313323345%61%
1809
February1st to 15thDay
8%413322235%62%
1750
16th to endDay
8%5%3233336%59%
1580
March1st to 15thDay
10%42331345%6%54%
1869
16th to endDay
7%423323335%60%
2112
April1st to 15thDay
9%312323336%60%
2096
16th to endDay
9%31332334460%
2227
May1st to 15thDay
11%323423345%56%
2331
16th to endDay
7%4233245%5%7%53%
2430
June1st to 15thDay
5%31342446%7%57%
2340
16th to endDay
5%21232445%8%57%
2340
July1st to 15thDay
6%213335%45%9%51%
2340
16th to endDay
221232346%10%60%
2466
August1st to 15thDay
32232436%8%60%
2259
16th to endDay
4314425%5%5%8%54%
2292
September1st to 15thDay
10%3145%2345%6%51%
2005
16th to endDay
7%214334346%58%
1815
October1st to 15thDay
9%31232333461%
1815
16th to endDay
4312212235%70%
1753
November1st to 15thDay
4212222336%67%
1583
16th to endDay
7%31211223467%
1620
December1st to 15thDay
9%5%14323246%57%
1620
16th to endDay
11%323322346%55%
1728
January1st to 15thNight
7%313313345%63%
2327
16th to endNight
5%322213335%65%
2425
February1st to 15thNight
7%423222245%61%
2102
16th to endNight
9%312322346%62%
1894
March1st to 15thNight
9%41442325%5%56%
2089
16th to endNight
7%323313346%60%
2112
April1st to 15thNight
7%422314435%59%
1849
16th to endNight
7%313213347%62%
1731
May1st to 15thNight
9%21232344461%
1619
16th to endNight
42223235%5%9%58%
1683
June1st to 15thNight
331232347%10%57%
1620
16th to endNight
321332336%9%59%
1620
July1st to 15thNight
4114325%5%6%10%54%
1620
16th to endNight
21231346%11%61%
1702
August1st to 15thNight
21123245%6%10%59%
1698
16th to endNight
32133145%6%10%56%
1910
September1st to 15thNight
10%324323447%50%
1928
16th to endNight
5%31443335%7%57%
1815
October1st to 15thNight
8%412212235%63%
1815
16th to endNight
3212322235%72%
2104
November1st to 15thNight
3212212347%67%
2275
16th to endNight
6%213213335%65%
2340
December1st to 15thNight
9%312222345%63%
2340
16th to endNight
10%423223345%57%
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
7%324223226%62%
1611
16th to endDay
6%31332335%5%61%
1809
February1st to 15thDay
8%413312235%62%
1750
16th to endDay
8%433313336%59%
1580
March1st to 15thDay
11%41331345%6%54%
1869
16th to endDay
7%42331433460%
2110
April1st to 15thDay
9%312313336%60%
2096
16th to endDay
9%31322334460%
2227
May1st to 15thDay
11%323413335%56%
2331
16th to endDay
7%41332445%7%53%
2430
June1st to 15thDay
6%22332445%7%57%
2340
16th to endDay
5%31332446%8%57%
2340
July1st to 15thDay
7%313335%45%9%51%
2340
16th to endDay
221232346%9%60%
2466
August1st to 15thDay
321241445%8%60%
2259
16th to endDay
431443445%8%55%
2292
September1st to 15thDay
11%2145%23447%51%
2005
16th to endDay
8%214334346%58%
1815
October1st to 15thDay
9%31232333461%
1815
16th to endDay
4212212235%70%
1753
November1st to 15thDay
5%212222336%67%
1583
16th to endDay
7%312212235%67%
1620
December1st to 15thDay
9%5%14323246%57%
1620
16th to endDay
11%314322347%55%
1728
January1st to 15thNight
7%313313345%63%
2327
16th to endNight
5%312213335%65%
2425
February1st to 15thNight
7%423212245%61%
2102
16th to endNight
9%312312336%62%
1894
March1st to 15thNight
9%5%1342325%5%56%
2089
16th to endNight
8%322313346%60%
2112
April1st to 15thNight
7%322323435%60%
1849
16th to endNight
8%312213347%62%
1731
May1st to 15thNight
9%21232344461%
1619
16th to endNight
5%2123225%5%9%58%
1683
June1st to 15thNight
431232337%10%57%
1620
16th to endNight
321332436%9%60%
1620
July1st to 15thNight
4223325%6%6%9%55%
1620
16th to endNight
311121345%11%61%
1702
August1st to 15thNight
311232446%10%60%
1698
16th to endNight
32133235%6%10%56%
1910
September1st to 15thNight
10%324324447%50%
1928
16th to endNight
5%21443335%7%57%
1815
October1st to 15thNight
9%312212236%63%
1815
16th to endNight
321222223472%
2104
November1st to 15thNight
4212312346%68%
2275
16th to endNight
6%213213335%65%
2340
December1st to 15thNight
9%312222245%64%
2340
16th to endNight
10%423323345%57%
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
25%26%26%27%12%
1612
16th to endDay
25%25%20%33%11%
1809
February1st to 15thDay
25%35%21%31%13%
1751
16th to endDay
27%3323%27%15%
1580
March1st to 15thDay
30%36%20%27%12%
1869
16th to endDay
27%38%24%22%12%
2112
April1st to 15thDay
26%38%18%26%17%
2096
16th to endDay
26%37%20%29%12%
2227
May1st to 15thDay
31%38%20%23%12%
2331
16th to endDay
29%5%11%21%23%9%
2434
June1st to 15thDay
24%5%11%25%24%9%
2340
16th to endDay
24%411%23%26%10%
2340
July1st to 15thDay
28%5%11%26%22%4
2201
16th to endDay
17%413%32%27%5%
2311
August1st to 15thDay
20%5%13%25%24%10%
2245
16th to endDay
25%5%12%26%22%7%
2292
September1st to 15thDay
32%49%23%22%7%
2005
16th to endDay
26%46%22%27%12%
1815
October1st to 15thDay
27%28%23%25%11%
1815
16th to endDay
17%25%20%33%19%
1753
November1st to 15thDay
19%26%22%31%16%
1583
16th to endDay
22%1418%33%20%
1620
December1st to 15thDay
29%27%24%27%8%
1620
16th to endDay
30%26%24%27%9%
1728
January1st to 15thNight
24%25%20%30%15%
2327
16th to endNight
22%25%17%34%17%
2425
February1st to 15thNight
26%26%19%27%17%
2112
16th to endNight
24%25%20%27%19%
1894
March1st to 15thNight
29%37%17%25%17%
2089
16th to endNight
25%39%25%23%11%
2112
April1st to 15thNight
26%48%18%23%18%
1849
16th to endNight
22%48%22%25%16%
1731
May1st to 15thNight
25%49%19%21%19%
1620
16th to endNight
22%5%12%24%22%12%
1685
June1st to 15thNight
20%414%27%24%8%
1620
16th to endNight
20%411%24%26%12%
1620
July1st to 15thNight
23%411%30%21%8%
1530
16th to endNight
15%410%30%31%7%
1594
August1st to 15thNight
16%412%24%29%12%
1688
16th to endNight
21%5%12%27%22%10%
1910
September1st to 15thNight
31%5%9%20%21%10%
1928
16th to endNight
26%39%19%26%14%
1815
October1st to 15thNight
24%29%21%26%15%
1815
16th to endNight
17%2419%34%22%
2104
November1st to 15thNight
17%26%22%29%20%
2275
16th to endNight
22%2417%32%21%
2340
December1st to 15thNight
23%26%24%29%13%
2340
16th to endNight
29%35%20%28%13%
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
21%231%30%13%2
90
16th to endDay
28%47%30%9%2
96
February1st to 15thDay
6%10%40%30%12%1
90
16th to endDay
8%6%38%35%9%1
81
March1st to 15thDay
12%6%42%34%4
90
16th to endDay
7%8%32%34%14%3
96
April1st to 15thDay
13%13%41%26%5%
215
16th to endDay
10%13%40%24%8%2
337
May1st to 15thDay
11%7%35%33%9%2
468
16th to endDay
11%6%28%33%16%4
517
June1st to 15thDay
5%121%43%22%5%
495
16th to endDay
5%113%40%30%7%
495
July1st to 15thDay
5%8%42%34%8%
475
16th to endDay
2330%47%16%
515
August1st to 15thDay
4229%50%12%
413
16th to endDay
339%32%40%11%
332
September1st to 15thDay
25%34%37%19%
170
16th to endDay
6%331%35%23%
90
October1st to 15thDay
6%217%37%32%3
90
16th to endDay
9%120%43%22%2
96
November1st to 15thDay
16%418%31%21%7%
90
16th to endDay
18%11%33%25%7%3
90
December1st to 15thDay
11%242%27%15%1
90
16th to endDay
14%10%40%27%7%
96
January1st to 15thNight
9%7%32%39%11%
900
16th to endNight
7%6%36%39%10%
889
February1st to 15thNight
9%9%33%36%10%
704
16th to endNight
10%10%42%31%5%
632
March1st to 15thNight
12%10%39%30%7%
649
16th to endNight
8%11%41%32%5%
576
April1st to 15thNight
7%11%47%28%3
539
16th to endNight
7%9%46%30%5%
540
May1st to 15thNight
9%7%43%30%8%1
540
16th to endNight
4435%38%15%
563
June1st to 15thNight
5%233%44%13%
540
16th to endNight
3124%46%21%1
540
July1st to 15thNight
49%50%32%3
510
16th to endNight
31345%43%3
564
August1st to 15thNight
21344%44%2
539
16th to endNight
37%41%42%4
573
September1st to 15thNight
10%211%39%33%2
537
16th to endNight
6%114%46%28%2
492
October1st to 15thNight
10%227%39%18%1
495
16th to endNight
4432%39%17%1
696
November1st to 15thNight
5%6%32%38%16%1
875
16th to endNight
8%6%31%40%12%
900
December1st to 15thNight
11%6%30%40%11%
900
16th to endNight
12%8%32%37%9%
960
Page generated at 2017-09-15 09:29:58. Version ac04

Copyright 2017 A. Danko


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