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 2017-03-24.

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
51%
15134
32%
45280
20%
15089
62%
15089
44%
23411

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
59%
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%
555
27%
2035
17%
555
50%
555
35%
999
April1st to 15thNight
28%
494
30%
1695
14%
494
50%
494
35%
864
April16th to endNight
33%
495
31%
1587
15%
495
56%
495
42%
781
May1st to 15thNight
36%
494
29%
1485
17%
494
55%
494
39%
805
May16th to endNight
49%
514
26%
1540
19%
513
62%
513
43%
830
June1st to 15thNight
53%
495
25%
1485
18%
495
65%
495
48%
744
June16th to endNight
62%
495
26%
1485
24%
495
68%
495
50%
739
July1st to 15thNight
74%
465
23%
1395
25%
465
77%
465
44%
743
July16th to endNight
87%
522
34%
1468
38%
489
88%
489
57%
687
August1st to 15thNight
88%
494
36%
1546
43%
491
89%
491
56%
707
August16th to endNight
80%
525
28%
1750
32%
525
82%
525
44%
875
September1st to 15thNight
66%
495
25%
1777
28%
495
70%
495
29%
1018
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
34%
2275
14%
875
63%
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
58%
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%
45646
Night
6%313323347%60%
45476
Cloud CoverDay
7%313323346%58%
45644
Night
6%313323346%61%
45476
TransparencyDay
26%38%23%26%11%
45344
Night
23%38%21%27%15%
45281
SeeingDay
7%421%34%25%5%
4848
Night
7%6%29%38%16%1
15137

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%59%
2033
April1st to 15thDay
8%312323436%60%
1920
16th to endDay
9%31332334460%
2041
May1st to 15thDay
12%423423345%54%
2136
16th to endDay
7%4233245%5%7%51%
2222
June1st to 15thDay
6%32332446%7%57%
2145
16th to endDay
5%21332445%8%56%
2145
July1st to 15thDay
7%313436%46%9%49%
2145
16th to endDay
221232346%9%60%
2284
August1st to 15thDay
22232436%8%63%
2071
16th to endDay
4314425%5%5%8%54%
2100
September1st to 15thDay
11%3145%2445%7%48%
1851
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%
2035
April1st to 15thNight
7%412314445%60%
1695
16th to endNight
8%213213446%63%
1587
May1st to 15thNight
10%21232344459%
1484
16th to endNight
5%2224235%5%10%56%
1539
June1st to 15thNight
331222347%11%56%
1485
16th to endNight
321322346%9%60%
1485
July1st to 15thNight
4224325%6%6%10%53%
1485
16th to endNight
211231345%11%62%
1576
August1st to 15thNight
2123245%6%10%60%
1556
16th to endNight
22133145%6%10%56%
1750
September1st to 15thNight
11%3243335%47%48%
1777
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%
2031
April1st to 15thDay
8%312313336%60%
1920
16th to endDay
9%31332334460%
2041
May1st to 15thDay
12%323413345%54%
2136
16th to endDay
8%413325%5%5%7%51%
2222
June1st to 15thDay
6%22332445%7%57%
2145
16th to endDay
5%31332446%8%57%
2145
July1st to 15thDay
7%313435%46%9%49%
2145
16th to endDay
321242345%9%60%
2284
August1st to 15thDay
311241435%8%63%
2071
16th to endDay
5%31443445%8%54%
2100
September1st to 15thDay
12%315%6%2345%7%48%
1851
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%59%
2035
April1st to 15thNight
7%322313435%60%
1695
16th to endNight
8%212213347%63%
1587
May1st to 15thNight
10%21232344459%
1484
16th to endNight
5%3124235%5%9%56%
1539
June1st to 15thNight
431232347%10%57%
1485
16th to endNight
321332436%9%60%
1485
July1st to 15thNight
4223325%6%6%10%53%
1485
16th to endNight
211121345%11%62%
1576
August1st to 15thNight
211232446%10%61%
1556
16th to endNight
22133235%6%10%56%
1750
September1st to 15thNight
11%424424447%48%
1777
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%13%
2033
April1st to 15thDay
25%39%18%25%17%
1920
16th to endDay
27%27%19%29%13%
2041
May1st to 15thDay
33%38%19%21%12%
2136
16th to endDay
30%5%11%21%22%8%
2226
June1st to 15thDay
24%5%10%24%24%10%
2145
16th to endDay
24%411%23%25%10%
2145
July1st to 15thDay
29%6%12%26%20%4
2006
16th to endDay
17%412%31%27%5%
2129
August1st to 15thDay
17%5%12%25%26%11%
2057
16th to endDay
25%6%12%26%22%6%
2100
September1st to 15thDay
34%410%21%20%7%
1851
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
26%39%25%23%12%
2035
April1st to 15thNight
26%48%17%23%20%
1695
16th to endNight
21%38%21%26%17%
1587
May1st to 15thNight
26%410%18%21%18%
1485
16th to endNight
23%6%13%24%22%10%
1541
June1st to 15thNight
21%413%27%24%9%
1485
16th to endNight
19%412%24%26%12%
1485
July1st to 15thNight
24%5%11%29%20%9%
1395
16th to endNight
15%410%30%31%8%
1468
August1st to 15thNight
15%411%23%31%13%
1546
16th to endNight
22%5%11%26%23%10%
1750
September1st to 15thNight
33%6%10%18%19%11%
1777
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
29%32%37%14%4
75
April1st to 15thDay
10%15%45%23%4
159
16th to endDay
11%12%42%23%8%1
271
May1st to 15thDay
13%7%36%33%8%
393
16th to endDay
12%6%26%34%16%4
437
June1st to 15thDay
5%222%44%22%3
420
16th to endDay
5%214%39%30%7%
420
July1st to 15thDay
7%9%43%36%3
400
16th to endDay
2332%46%14%
445
August1st to 15thDay
2231%51%11%
345
16th to endDay
2310%35%36%10%
268
September1st to 15thDay
37%39%38%10%
126
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%40%32%5%
555
April1st to 15thNight
7%12%48%27%3
494
16th to endNight
7%10%46%30%5%
495
May1st to 15thNight
9%7%43%30%7%1
495
16th to endNight
5%335%37%16%
515
June1st to 15thNight
5%334%45%11%
495
16th to endNight
3224%45%22%1
495
July1st to 15thNight
410%50%30%3
465
16th to endNight
31345%43%2
522
August1st to 15thNight
21244%46%2
494
16th to endNight
48%42%41%3
525
September1st to 15thNight
11%212%38%32%2
495
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 2017-03-25 11:39:46. Version ac04

Copyright 2017 A. Danko


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