Colorado Springs
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Colorado Springs 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
56%
16594
28%
48903
19%
16553
65%
16553
43%
26122

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
52%
973
31%
2716
19%
970
63%
970
51%
1388
January16th to endNight
53%
861
35%
2733
25%
861
66%
861
49%
1305
February1st to 15thNight
41%
760
26%
2409
15%
759
55%
759
41%
1268
February16th to endNight
41%
660
35%
1978
15%
660
62%
660
46%
1020
March1st to 15thNight
48%
720
29%
2124
16%
720
58%
720
46%
1110
March16th to endNight
46%
672
28%
2016
16%
672
59%
672
41%
1085
April1st to 15thNight
42%
539
25%
1798
14%
539
59%
539
38%
932
April16th to endNight
44%
540
23%
1800
18%
540
56%
540
32%
1012
May1st to 15thNight
51%
539
20%
1656
17%
539
56%
539
31%
991
May16th to endNight
54%
562
18%
1498
12%
561
60%
561
37%
903
June1st to 15thNight
64%
540
22%
1440
16%
540
68%
540
48%
771
June16th to endNight
72%
540
23%
1440
18%
540
75%
540
45%
798
July1st to 15thNight
71%
510
17%
1360
15%
510
72%
510
32%
864
July16th to endNight
78%
564
20%
1458
19%
531
78%
531
35%
900
August1st to 15thNight
72%
539
15%
1698
16%
536
73%
536
29%
1030
August16th to endNight
79%
573
24%
1910
26%
573
81%
573
35%
1048
September1st to 15thNight
72%
540
26%
1800
27%
540
75%
540
36%
987
September16th to endNight
70%
537
34%
1941
35%
537
77%
537
43%
910
October1st to 15thNight
57%
690
30%
2130
20%
690
66%
690
44%
1102
October16th to endNight
63%
795
38%
2331
23%
795
71%
795
53%
1149
November1st to 15thNight
58%
950
35%
2470
19%
950
64%
950
59%
1271
November16th to endNight
57%
975
39%
2555
22%
975
67%
975
59%
1274
December1st to 15thNight
48%
975
27%
2730
13%
975
58%
975
48%
1439
December16th to endNight
44%
1040
31%
2912
16%
1040
57%
1040
45%
1565

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
44244245%6%8%53%
49362
Night
331332345%8%59%
49079
Cloud CoverDay
44134245%6%8%54%
49360
Night
331332345%7%60%
49079
TransparencyDay
25%6%12%24%21%8%
49040
Night
23%6%13%26%22%8%
48903
SeeingDay
7%9%31%28%16%5%
6290
Night
5%429%38%18%3
16602

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
121331235%9%63%
1552
16th to endDay
1323313337%65%
1856
February1st to 15thDay
142442335%8%58%
1783
16th to endDay
5%15%32345%7%59%
1642
March1st to 15thDay
242442336%8%56%
1833
16th to endDay
46%2422445%10%52%
2208
April1st to 15thDay
342333447%8%53%
2150
16th to endDay
7%6%35%435%45%7%46%
2160
May1st to 15thDay
9%6%35%435%6%6%8%39%
2292
16th to endDay
6%5%24435%5%8%10%44%
2616
June1st to 15thDay
4314325%5%8%9%51%
2520
16th to endDay
3213335%6%8%9%53%
2520
July1st to 15thDay
6%3245%36%6%7%10%42%
2520
16th to endDay
43235%36%8%8%11%40%
2609
August1st to 15thDay
5%3245%36%7%9%9%39%
2253
16th to endDay
4313435%6%9%9%47%
2292
September1st to 15thDay
5%3144246%7%10%49%
2160
16th to endDay
431231445%6%62%
2017
October1st to 15thDay
5%213313347%63%
1827
16th to endDay
4312113345%68%
1878
November1st to 15thDay
121331335%8%65%
1718
16th to endDay
212312347%69%
1732
December1st to 15thDay
1324414246%64%
1560
16th to endDay
342321345%9%59%
1664
January1st to 15thNight
224313346%66%
2716
16th to endNight
1313223336%68%
2733
February1st to 15thNight
142342445%7%58%
2399
16th to endNight
41442435%5%63%
1978
March1st to 15thNight
141232346%7%61%
2124
16th to endNight
3423323347%60%
2016
April1st to 15thNight
441232445%7%59%
1798
16th to endNight
8%6%24322347%54%
1800
May1st to 15thNight
9%5%233245%6%7%48%
1655
16th to endNight
7%423325%5%5%8%51%
1497
June1st to 15thNight
421222445%9%60%
1440
16th to endNight
2312225%5%7%8%58%
1440
July1st to 15thNight
5%3245%36%7%7%8%45%
1440
16th to endNight
43244345%8%12%46%
1557
August1st to 15thNight
5%315%5%45%6%6%9%47%
1707
16th to endNight
44133245%7%12%50%
1910
September1st to 15thNight
6%31443445%9%51%
1800
16th to endNight
4213313346%65%
1941
October1st to 15thNight
5%313213345%64%
2130
16th to endNight
3212212347%67%
2331
November1st to 15thNight
1213312348%66%
2470
16th to endNight
1222212346%70%
2555
December1st to 15thNight
122432235%9%62%
2730
16th to endNight
232342335%8%60%
2912

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
121321345%7%64%
1552
16th to endDay
1313323337%66%
1856
February1st to 15thDay
2334423348%58%
1783
16th to endDay
1425%32345%7%59%
1642
March1st to 15thDay
343442335%8%57%
1833
16th to endDay
46%2331445%9%53%
2206
April1st to 15thDay
34234245%6%8%54%
2150
16th to endDay
8%7%244245%47%47%
2160
May1st to 15thDay
9%6%35%435%5%6%7%41%
2292
16th to endDay
7%414425%6%7%9%45%
2616
June1st to 15thDay
43134345%7%9%52%
2520
16th to endDay
3212425%6%8%8%53%
2520
July1st to 15thDay
6%3145%35%6%8%9%44%
2520
16th to endDay
43245%37%7%8%11%41%
2609
August1st to 15thDay
5%3145%46%7%8%10%41%
2253
16th to endDay
5%313436%5%8%9%48%
2292
September1st to 15thDay
6%3133246%6%9%51%
2160
16th to endDay
4312323447%63%
2017
October1st to 15thDay
6%213222346%64%
1827
16th to endDay
4312212345%69%
1878
November1st to 15thDay
121331335%8%65%
1718
16th to endDay
213312346%70%
1732
December1st to 15thDay
1314423337%63%
1560
16th to endDay
242331345%8%58%
1664
January1st to 15thNight
1223313346%66%
2716
16th to endNight
1322323336%67%
2733
February1st to 15thNight
1424423447%58%
2399
16th to endNight
413424345%63%
1978
March1st to 15thNight
141332345%7%61%
2124
16th to endNight
3423323347%60%
2016
April1st to 15thNight
441232345%7%59%
1798
16th to endNight
9%7%13323348%53%
1800
May1st to 15thNight
9%5%1432446%7%49%
1655
16th to endNight
8%412325%5%5%9%51%
1497
June1st to 15thNight
42231435%9%61%
1440
16th to endNight
23123245%7%8%58%
1440
July1st to 15thNight
5%3235%37%6%7%8%46%
1440
16th to endNight
5%3144346%7%11%47%
1557
August1st to 15thNight
6%3145%45%6%6%9%47%
1707
16th to endNight
5%3123245%7%10%51%
1910
September1st to 15thNight
7%313335%46%9%51%
1800
16th to endNight
5%212312446%64%
1941
October1st to 15thNight
6%413213245%64%
2130
16th to endNight
3312212336%68%
2331
November1st to 15thNight
1212313248%66%
2470
16th to endNight
1222212345%70%
2555
December1st to 15thNight
122432335%8%62%
2730
16th to endNight
2424323347%60%
2912

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
17%5%12%31%26%6%
1553
16th to endDay
18%39%31%26%10%
1856
February1st to 15thDay
24%6%13%31%17%5%
1784
16th to endDay
24%48%27%26%8%
1642
March1st to 15thDay
24%5%11%25%25%8%
1833
16th to endDay
28%6%12%24%22%5%
2208
April1st to 15thDay
25%7%13%25%19%8%
2150
16th to endDay
35%6%12%23%16%5%
2160
May1st to 15thDay
39%7%12%21%16%2
2292
16th to endDay
31%9%15%22%13%6%
2620
June1st to 15thDay
25%7%15%20%19%12%
2520
16th to endDay
21%8%11%20%25%13%
2520
July1st to 15thDay
32%7%13%20%15%9%
2371
16th to endDay
30%11%16%23%14%3
2445
August1st to 15thDay
32%11%15%19%13%8%
2238
16th to endDay
26%9%13%22%22%5%
2292
September1st to 15thDay
25%8%13%22%18%10%
2160
16th to endDay
20%5%8%22%32%10%
2017
October1st to 15thDay
21%5%11%20%30%10%
1827
16th to endDay
19%39%25%29%13%
1878
November1st to 15thDay
17%411%26%27%13%
1718
16th to endDay
15%28%26%33%12%
1732
December1st to 15thDay
21%5%13%29%23%6%
1560
16th to endDay
24%415%27%20%6%
1664
January1st to 15thNight
19%311%31%25%7%
2716
16th to endNight
18%410%27%28%9%
2733
February1st to 15thNight
24%6%13%32%18%4
2409
16th to endNight
23%37%30%26%9%
1978
March1st to 15thNight
21%5%10%27%28%6%
2124
16th to endNight
22%7%12%23%28%6%
2016
April1st to 15thNight
23%7%13%25%21%9%
1798
16th to endNight
31%5%13%26%16%6%
1800
May1st to 15thNight
32%7%16%22%15%4
1656
16th to endNight
28%8%17%23%13%7%
1498
June1st to 15thNight
19%7%19%24%14%14%
1440
16th to endNight
20%9%13%21%20%14%
1440
July1st to 15thNight
32%10%15%20%13%7%
1360
16th to endNight
28%11%17%25%13%2
1458
August1st to 15thNight
32%10%16%21%11%7%
1698
16th to endNight
26%8%15%27%16%5%
1910
September1st to 15thNight
28%6%14%24%17%9%
1800
16th to endNight
20%5%10%24%29%8%
1941
October1st to 15thNight
21%6%11%20%28%10%
2130
16th to endNight
18%49%26%29%12%
2331
November1st to 15thNight
17%311%25%27%14%
2470
16th to endNight
16%210%28%31%11%
2555
December1st to 15thNight
19%6%14%29%22%7%
2730
16th to endNight
23%5%15%25%24%6%
2912

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
10%5%29%38%13%2
135
16th to endDay
46%29%40%16%2
144
February1st to 15thDay
5%12%49%23%8%
135
16th to endDay
15%52%25%6%2
100
March1st to 15thDay
112%48%29%7%
123
16th to endDay
11%24%44%15%31
288
April1st to 15thDay
8%22%43%18%5%2
269
16th to endDay
18%24%34%16%4
270
May1st to 15thDay
13%12%31%30%8%3
414
16th to endDay
11%10%30%26%16%5%
517
June1st to 15thDay
5%9%28%28%21%6%
495
16th to endDay
36%26%29%26%7%
495
July1st to 15thDay
9%122%25%30%10%
475
16th to endDay
6%114%30%32%14%
468
August1st to 15thDay
10%424%35%18%6%
315
16th to endDay
6%323%43%14%8%
332
September1st to 15thDay
6%5%38%28%12%7%
315
16th to endDay
11%7%31%22%19%7%
172
October1st to 15thDay
5%10%25%33%16%8%
135
16th to endDay
47%32%27%23%4
144
November1st to 15thDay
28%34%28%20%5%
135
16th to endDay
5%11%42%28%11%
135
December1st to 15thDay
29%48%28%8%1
135
16th to endDay
46%41%33%12%
144
January1st to 15thNight
25%35%38%14%3
975
16th to endNight
3336%42%12%2
861
February1st to 15thNight
3346%37%7%
764
16th to endNight
25%46%36%8%
660
March1st to 15thNight
3441%36%12%1
720
16th to endNight
5%6%38%38%9%1
672
April1st to 15thNight
8%8%38%34%8%
539
16th to endNight
13%8%30%37%8%1
540
May1st to 15thNight
11%6%26%39%15%1
540
16th to endNight
9%328%38%17%2
563
June1st to 15thNight
4324%43%21%2
540
16th to endNight
3117%46%28%2
540
July1st to 15thNight
6%110%37%38%4
510
16th to endNight
5%6%34%46%5%
564
August1st to 15thNight
7%18%35%41%5%
539
16th to endNight
7%6%39%39%6%
573
September1st to 15thNight
7%112%41%30%6%
540
16th to endNight
6%117%41%27%6%
537
October1st to 15thNight
8%327%35%18%5%
690
16th to endNight
4424%35%25%5%
795
November1st to 15thNight
2232%41%17%3
950
16th to endNight
25%31%43%14%3
975
December1st to 15thNight
2441%39%10%1
975
16th to endNight
36%39%36%10%2
1040
Page generated at 2018-02-23 09:21:31. Version ac04

Copyright 2018 A. Danko


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