Desert Hot Springs
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Desert Hot Springs clear sky chart from 2005-11-06 to 2024-01-13.

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
69%
24806
41%
74385
31%
24760
79%
24760
68%
30859

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
63%
757
36%
2457
30%
756
74%
756
55%
1073
January11th to 20thNight
67%
732
41%
2357
34%
732
79%
732
57%
1012
January21st to endNight
57%
792
43%
2376
29%
792
75%
792
55%
1096
February1st to 10thNight
62%
720
41%
2160
31%
720
76%
720
58%
974
February11th to 20thNight
58%
700
41%
2098
30%
700
75%
700
61%
925
February21st to endNight
56%
592
42%
1776
34%
592
72%
592
64%
753
March1st to 10thNight
54%
720
35%
2160
25%
720
71%
720
58%
954
March11th to 20thNight
60%
720
40%
2048
29%
720
74%
720
68%
877
March21st to endNight
55%
792
41%
2109
21%
792
71%
792
67%
959
April1st to 10thNight
53%
720
40%
1800
18%
720
67%
720
67%
866
April11th to 20thNight
53%
711
44%
1779
18%
711
68%
711
74%
811
April21st to endNight
58%
720
44%
1800
18%
720
70%
720
80%
788
May1st to 10thNight
59%
541
46%
1621
26%
541
71%
541
81%
590
May11th to 20thNight
63%
531
44%
1595
28%
531
72%
531
80%
588
May21st to endNight
55%
583
42%
1746
26%
582
66%
582
81%
631
June1st to 10thNight
67%
540
39%
1620
30%
540
71%
540
78%
609
June11th to 20thNight
68%
540
41%
1620
30%
540
74%
540
86%
581
June21st to endNight
75%
540
39%
1620
30%
540
80%
540
81%
605
July1st to 10thNight
86%
525
38%
1575
32%
525
87%
525
82%
589
July11th to 20thNight
86%
522
38%
1566
32%
522
87%
522
73%
622
July21st to endNight
87%
594
39%
1677
32%
561
87%
561
65%
725
August1st to 10thNight
86%
716
39%
1780
24%
712
88%
712
82%
793
August11th to 20thNight
92%
712
43%
1780
28%
712
93%
712
83%
787
August21st to endNight
90%
792
46%
1980
32%
792
91%
792
80%
893
September1st to 10thNight
87%
720
43%
1839
32%
720
90%
720
76%
833
September11th to 20thNight
86%
720
49%
1980
40%
720
93%
720
88%
772
September21st to endNight
82%
720
49%
1980
40%
720
90%
720
86%
782
October1st to 10thNight
73%
720
46%
1980
33%
720
85%
720
79%
821
October11th to 20thNight
78%
720
52%
1980
41%
720
88%
720
83%
793
October21st to endNight
76%
792
45%
2484
41%
792
86%
792
79%
905
November1st to 10thNight
76%
740
42%
2405
39%
740
87%
740
75%
883
November11th to 20thNight
77%
760
43%
2470
40%
760
88%
760
71%
941
November21st to endNight
68%
760
41%
2470
38%
760
78%
760
60%
1045
December1st to 10thNight
65%
760
39%
2470
33%
760
76%
760
57%
1059
December11th to 20thNight
63%
759
38%
2887
32%
758
74%
758
47%
1247
December21st to endNight
57%
823
25%
4340
30%
817
70%
817
37%
1677

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
2112212345%77%
74857
Night
2112212345%78%
74927
TransparencyDay
11%1413%25%45%
74585
Night
11%15%16%28%40%
74721
SeeingDay
210%25%34%22%7%
14442
Night
2323%38%29%6%
24828

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
31232445%7%69%
1708
11th to 20thDay
5%21222235%7%70%
1660
21st to endDay
3212323346%70%
1980
February1st to 10thDay
3212213346%72%
1800
11th to 20thDay
211222325%8%72%
1750
21st to endDay
121232345%6%71%
1480
March1st to 10thDay
221221245%8%71%
1800
11th to 20thDay
211223335%7%71%
1912
21st to endDay
111123347%77%
2242
April1st to 10thDay
2212212337%74%
2160
11th to 20thDay
111111223483%
2129
21st to endDay
11111336%83%
2160
May1st to 10thDay
11112235%83%
2335
11th to 20thDay
1111113387%
2301
21st to endDay
111122487%
2530
June1st to 10thDay
11111122486%
2340
11th to 20thDay
112392%
2340
21st to endDay
111121222385%
2340
July1st to 10thDay
21222233480%
2340
11th to 20thDay
2112222446%73%
2340
21st to endDay
22133245%6%7%64%
2537
August1st to 10thDay
1111213445%79%
2149
11th to 20thDay
111113346%78%
2122
21st to endDay
211211223480%
2376
September1st to 10thDay
3212223335%76%
2120
11th to 20thDay
1111112390%
1980
21st to endDay
11121222385%
1980
October1st to 10thDay
111212335%82%
1980
11th to 20thDay
111223486%
1980
21st to endDay
11111233485%
1867
November1st to 10thDay
111212345%81%
1674
11th to 20thDay
11112335%5%77%
1710
21st to endDay
1212223447%73%
1710
December1st to 10thDay
231332445%8%66%
1710
11th to 20thDay
431333446%9%59%
2169
21st to endDay
6%31443346%7%60%
3146
January1st to 10thNight
221232345%7%69%
2457
11th to 20thNight
321222335%7%71%
2357
21st to endNight
4212324346%70%
2376
February1st to 10thNight
1213323346%72%
2160
11th to 20thNight
221222335%5%73%
2098
21st to endNight
2122135%5%7%72%
1776
March1st to 10thNight
311222346%9%68%
2160
11th to 20thNight
21121245%8%73%
2048
21st to endNight
2111113347%75%
2109
April1st to 10thNight
1212212347%75%
1800
11th to 20thNight
12211122484%
1779
21st to endNight
11112135%84%
1800
May1st to 10thNight
1223487%
1621
11th to 20thNight
1112225%87%
1594
21st to endNight
111111490%
1746
June1st to 10thNight
111212488%
1620
11th to 20thNight
11112391%
1620
21st to endNight
11111222289%
1620
July1st to 10thNight
111222486%
1620
11th to 20thNight
1111212235%80%
1620
21st to endNight
1113223348%72%
1776
August1st to 10thNight
111111123483%
1790
11th to 20thNight
11111133485%
1780
21st to endNight
211111122484%
1980
September1st to 10thNight
211211223482%
1839
11th to 20thNight
11111292%
1980
21st to endNight
1111122290%
1980
October1st to 10thNight
11121223483%
1980
11th to 20thNight
11111112388%
1980
21st to endNight
111232486%
2484
November1st to 10thNight
11111224483%
2405
11th to 20thNight
111221133481%
2470
21st to endNight
211332335%6%71%
2470
December1st to 10thNight
321222335%8%68%
2470
11th to 20thNight
33124245%6%10%61%
3041
21st to endNight
5%31332345%7%64%
4521

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
17%26%20%31%25%
1709
11th to 20thDay
16%26%15%33%28%
1660
21st to endDay
17%26%17%28%30%
1980
February1st to 10thDay
16%16%13%28%36%
1800
11th to 20thDay
12%1416%30%36%
1760
21st to endDay
15%26%18%28%31%
1480
March1st to 10thDay
14%2419%31%31%
1800
11th to 20thDay
14%1418%30%33%
1912
21st to endDay
10%1322%34%30%
2242
April1st to 10thDay
13%1417%33%32%
2160
11th to 20thDay
8%213%33%44%
2132
21st to endDay
6%1316%30%45%
2160
May1st to 10thDay
7%1315%30%45%
2335
11th to 20thDay
5%128%31%52%
2304
21st to endDay
5%1212%33%46%
2530
June1st to 10thDay
6%19%26%57%
2340
11th to 20thDay
3115%17%73%
2340
21st to endDay
9%1149%77%
2340
July1st to 10thDay
10%217%14%66%
2276
11th to 20thDay
12%3412%23%47%
2271
21st to endDay
18%26%16%23%35%
2396
August1st to 10thDay
10%1110%20%57%
2135
11th to 20thDay
9%2211%23%53%
2122
21st to endDay
10%238%22%55%
2376
September1st to 10thDay
13%239%16%57%
2120
11th to 20thDay
411421%69%
1980
21st to endDay
7%117%24%59%
1980
October1st to 10thDay
8%1211%25%52%
1980
11th to 20thDay
4149%24%59%
1980
21st to endDay
7%139%22%60%
1867
November1st to 10thDay
9%1311%28%49%
1674
11th to 20thDay
11%1412%26%46%
1710
21st to endDay
13%1415%28%39%
1710
December1st to 10thDay
19%16%19%22%33%
1710
11th to 20thDay
22%29%24%22%22%
2168
21st to endDay
24%17%28%25%14%
3146
January1st to 10thNight
16%26%21%29%25%
2457
11th to 20thNight
15%25%18%31%29%
2357
21st to endNight
18%27%18%23%33%
2376
February1st to 10thNight
16%1416%25%37%
2160
11th to 20thNight
14%26%16%26%35%
2099
21st to endNight
12%26%22%29%30%
1776
March1st to 10thNight
14%36%22%30%25%
2160
11th to 20thNight
11%17%21%31%29%
2048
21st to endNight
11%17%20%34%26%
2109
April1st to 10thNight
13%17%24%32%24%
1800
11th to 20thNight
9%1418%32%37%
1779
21st to endNight
5%1416%40%34%
1800
May1st to 10thNight
41321%34%37%
1621
11th to 20thNight
5%15%12%39%38%
1595
21st to endNight
4218%45%30%
1746
June1st to 10thNight
6%212%29%50%
1620
11th to 20thNight
429%19%67%
1620
21st to endNight
6%15%14%75%
1620
July1st to 10thNight
6%115%18%69%
1575
11th to 20thNight
9%1314%26%47%
1566
21st to endNight
13%16%18%27%34%
1677
August1st to 10thNight
7%1211%23%56%
1780
11th to 20thNight
6%1210%27%54%
1780
21st to endNight
7%119%24%57%
1980
September1st to 10thNight
9%139%20%59%
1839
11th to 20thNight
415%23%66%
1980
21st to endNight
4118%26%60%
1980
October1st to 10thNight
7%1311%33%45%
1980
11th to 20thNight
6%28%28%56%
1980
21st to endNight
6%149%21%59%
2484
November1st to 10thNight
8%1311%33%44%
2405
11th to 20thNight
10%1314%28%45%
2470
21st to endNight
15%2415%29%35%
2470
December1st to 10thNight
16%17%19%23%34%
2470
11th to 20thNight
19%29%19%28%22%
3041
21st to endNight
21%19%30%24%15%
4521

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
5%8%29%39%18%2
270
11th to 20thDay
10%10%18%39%21%2
266
21st to endDay
414%31%33%16%2
462
February1st to 10thDay
414%27%34%17%5%
420
11th to 20thDay
420%31%33%11%1
415
21st to endDay
323%35%26%12%1
346
March1st to 10thDay
5%23%30%31%10%1
420
11th to 20thDay
5%14%33%32%13%4
420
21st to endDay
224%36%27%10%2
462
April1st to 10thDay
5%17%27%29%18%3
420
11th to 20thDay
222%36%24%14%3
412
21st to endDay
220%28%28%16%6%
420
May1st to 10thDay
315%34%30%12%6%
423
11th to 20thDay
14%32%33%16%5%
448
21st to endDay
115%29%31%18%5%
485
June1st to 10thDay
210%25%32%25%6%
450
11th to 20thDay
7%27%35%21%10%
450
21st to endDay
2428%33%23%10%
450
July1st to 10thDay
1117%39%30%12%
446
11th to 20thDay
211%39%33%15%
444
21st to endDay
210%41%31%16%
487
August1st to 10thDay
2115%39%29%14%
447
11th to 20thDay
1113%36%35%14%
437
21st to endDay
2111%38%34%15%
495
September1st to 10thDay
3218%42%27%8%
450
11th to 20thDay
15%22%38%28%6%
450
21st to endDay
8%22%33%28%8%
450
October1st to 10thDay
19%27%35%23%4
450
11th to 20thDay
18%22%37%27%4
450
21st to endDay
26%21%35%29%7%
350
November1st to 10thDay
9%19%36%29%7%
270
11th to 20thDay
15%19%41%27%6%
270
21st to endDay
18%28%31%25%7%
270
December1st to 10thDay
6%428%38%21%4
270
11th to 20thDay
36%25%35%28%4
270
21st to endDay
6%11%30%32%20%2
297
January1st to 10thNight
3426%39%22%7%
760
11th to 20thNight
3323%41%24%5%
732
21st to endNight
4431%37%21%3
792
February1st to 10thNight
2427%39%23%5%
720
11th to 20thNight
3432%37%19%4
704
21st to endNight
27%33%38%16%3
592
March1st to 10thNight
37%33%39%16%2
720
11th to 20thNight
26%30%34%22%6%
720
21st to endNight
28%33%36%19%3
792
April1st to 10thNight
26%35%35%18%4
720
11th to 20thNight
17%36%32%21%3
711
21st to endNight
17%33%31%22%6%
720
May1st to 10thNight
8%32%41%18%2
541
11th to 20thNight
5%31%37%24%3
531
21st to endNight
8%36%33%21%2
584
June1st to 10thNight
5%26%43%22%3
540
11th to 20thNight
229%44%24%1
540
21st to endNight
1221%45%29%2
540
July1st to 10thNight
1111%44%40%4
525
11th to 20thNight
28%46%40%3
522
21st to endNight
16%43%47%3
594
August1st to 10thNight
19%41%40%8%
716
11th to 20thNight
1435%49%11%
712
21st to endNight
21429%50%13%
792
September1st to 10thNight
27%31%50%10%
720
11th to 20thNight
111%40%39%9%
720
21st to endNight
1114%37%39%8%
720
October1st to 10thNight
1221%40%33%4
720
11th to 20thNight
1217%37%36%7%
720
21st to endNight
319%35%31%11%
792
November1st to 10thNight
1219%39%31%8%
740
11th to 20thNight
2116%43%30%8%
760
21st to endNight
2223%41%26%6%
760
December1st to 10thNight
3226%40%24%5%
760
11th to 20thNight
3326%40%24%4
760
21st to endNight
45%30%37%19%5%
836
Page generated at 2024-01-10 16:35:22. Version ac07

Copyright 2024 Attilla Danko


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