Ridgecrest
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Ridgecrest 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
69%
24045
40%
74376
31%
24005
78%
24005
62%
31527

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
66%
756
31%
2646
30%
756
74%
756
49%
1162
January11th to 20thNight
69%
734
37%
2528
34%
734
80%
734
55%
1051
January21st to endNight
62%
792
42%
2402
34%
792
73%
792
50%
1149
February1st to 10thNight
63%
720
39%
2160
33%
720
73%
720
54%
1004
February11th to 20thNight
62%
700
40%
2098
33%
700
76%
700
57%
938
February21st to endNight
59%
592
40%
1776
32%
592
74%
592
54%
809
March1st to 10thNight
55%
720
35%
2160
26%
720
72%
720
51%
969
March11th to 20thNight
56%
720
33%
2111
24%
720
69%
720
56%
962
March21st to endNight
54%
792
41%
1994
20%
792
69%
792
61%
976
April1st to 10thNight
53%
720
39%
1800
17%
720
66%
720
59%
882
April11th to 20thNight
55%
711
41%
1779
17%
711
66%
711
63%
842
April21st to endNight
59%
720
42%
1800
17%
720
69%
720
68%
831
May1st to 10thNight
51%
576
42%
1656
22%
576
61%
576
69%
650
May11th to 20thNight
61%
531
44%
1595
28%
531
70%
531
72%
609
May21st to endNight
59%
582
39%
1746
24%
582
69%
582
71%
663
June1st to 10thNight
64%
450
40%
1530
30%
450
76%
450
75%
524
June11th to 20thNight
68%
360
43%
1440
41%
360
83%
360
76%
426
June21st to endNight
75%
360
43%
1440
43%
360
87%
360
77%
426
July1st to 10thNight
83%
350
42%
1400
43%
350
92%
350
76%
423
July11th to 20thNight
86%
348
41%
1392
45%
348
90%
348
64%
475
July21st to endNight
85%
601
40%
1684
32%
568
86%
568
65%
733
August1st to 10thNight
79%
716
38%
1780
23%
712
82%
712
77%
820
August11th to 20thNight
85%
712
42%
1780
25%
712
87%
712
83%
783
August21st to endNight
83%
792
46%
1980
29%
792
86%
792
82%
885
September1st to 10thNight
83%
720
45%
1800
31%
720
88%
720
78%
823
September11th to 20thNight
79%
720
49%
1948
36%
720
89%
720
84%
784
September21st to endNight
80%
720
49%
1980
38%
720
90%
720
84%
779
October1st to 10thNight
75%
720
44%
1980
34%
720
87%
720
77%
827
October11th to 20thNight
78%
720
48%
2078
41%
720
88%
720
73%
839
October21st to endNight
76%
792
47%
2479
43%
792
87%
792
73%
940
November1st to 10thNight
74%
740
42%
2405
40%
740
84%
740
67%
921
November11th to 20thNight
80%
760
42%
2470
42%
760
87%
760
66%
979
November21st to endNight
72%
760
42%
2470
40%
760
80%
760
62%
1000
December1st to 10thNight
70%
760
36%
2470
32%
760
78%
760
51%
1100
December11th to 20thNight
64%
759
34%
2926
33%
758
73%
758
40%
1383
December21st to endNight
62%
819
21%
4693
30%
817
72%
817
26%
2160

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
2212212346%77%
74945
Night
2112212346%76%
74808
TransparencyDay
11%2415%27%40%
74661
Night
12%25%17%29%35%
74613
SeeingDay
5%8%18%29%26%14%
14224
Night
36%19%40%29%3
24073

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
322332336%9%65%
1519
11th to 20thDay
5%312213449%65%
1500
21st to endDay
432432435%7%64%
1948
February1st to 10thDay
3213223436%72%
1800
11th to 20thDay
311221335%10%70%
1750
21st to endDay
4212323446%70%
1480
March1st to 10thDay
23132235%6%9%66%
1800
11th to 20thDay
221321345%10%67%
1847
21st to endDay
11111345%8%74%
2358
April1st to 10thDay
2112213348%73%
2160
11th to 20thDay
111221324480%
2129
21st to endDay
1111112347%79%
2160
May1st to 10thDay
111112235%83%
2304
11th to 20thDay
111112235%83%
2301
21st to endDay
2111222235%80%
2530
June1st to 10thDay
111112236%81%
2423
11th to 20thDay
111123487%
2520
21st to endDay
111111121387%
2520
July1st to 10thDay
111111223483%
2520
11th to 20thDay
2112312335%78%
2520
21st to endDay
3212223337%73%
2528
August1st to 10thDay
211121222383%
2149
11th to 20thDay
11121122485%
2122
21st to endDay
11111223485%
2376
September1st to 10thDay
111121223482%
2160
11th to 20thDay
11112390%
2012
21st to endDay
1111212388%
1980
October1st to 10thDay
111211122483%
1980
11th to 20thDay
111111222485%
1877
21st to endDay
211112235%83%
1877
November1st to 10thDay
111112335%81%
1674
11th to 20thDay
121221235%7%75%
1710
21st to endDay
3211213349%73%
1710
December1st to 10thDay
221332345%9%66%
1710
11th to 20thDay
34244445%6%9%54%
2169
21st to endDay
6%6%25%4345%6%8%51%
2822
January1st to 10thNight
331341335%9%65%
2646
11th to 20thNight
321232335%9%68%
2528
21st to endNight
4323313336%68%
2402
February1st to 10thNight
2314323446%70%
2160
11th to 20thNight
2213223336%73%
2098
21st to endNight
4112223446%71%
1776
March1st to 10thNight
211232345%10%67%
2160
11th to 20thNight
321122346%8%68%
2111
21st to endNight
2211212347%73%
1994
April1st to 10thNight
2112213346%75%
1800
11th to 20thNight
111221233479%
1779
21st to endNight
1111212336%81%
1800
May1st to 10thNight
11112246%83%
1656
11th to 20thNight
111211226%84%
1594
21st to endNight
111111225%85%
1746
June1st to 10thNight
11112225%85%
1530
11th to 20thNight
1122488%
1440
21st to endNight
1111112389%
1440
July1st to 10thNight
111122486%
1440
11th to 20thNight
112222345%78%
1440
21st to endNight
2112223335%76%
1783
August1st to 10thNight
2111211335%81%
1790
11th to 20thNight
1111122486%
1780
21st to endNight
11111112388%
1980
September1st to 10thNight
11121222484%
1800
11th to 20thNight
111222389%
1948
21st to endNight
11112390%
1980
October1st to 10thNight
1111234483%
1980
11th to 20thNight
11111222484%
2078
21st to endNight
111111123484%
2479
November1st to 10thNight
1112212246%80%
2405
11th to 20thNight
1112212346%78%
2470
21st to endNight
2112212348%73%
2470
December1st to 10thNight
331322335%7%68%
2470
11th to 20thNight
431342347%9%59%
3041
21st to endNight
5%4244346%6%8%55%
4814

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
18%210%32%32%7%
1519
11th to 20thDay
18%38%27%30%14%
1500
21st to endDay
21%36%25%30%15%
1948
February1st to 10thDay
16%27%22%31%22%
1800
11th to 20thDay
13%36%20%34%25%
1760
21st to endDay
16%38%22%32%18%
1480
March1st to 10thDay
16%37%22%32%20%
1800
11th to 20thDay
14%29%23%29%23%
1847
21st to endDay
10%38%23%35%20%
2358
April1st to 10thDay
13%27%22%31%25%
2160
11th to 20thDay
10%25%18%37%29%
2132
21st to endDay
7%25%19%36%31%
2160
May1st to 10thDay
7%1317%32%39%
2304
11th to 20thDay
7%1116%36%39%
2304
21st to endDay
10%2315%37%34%
2530
June1st to 10thDay
8%2312%24%51%
2423
11th to 20thDay
4117%21%65%
2520
21st to endDay
7%11413%75%
2520
July1st to 10thDay
7%115%14%71%
2451
11th to 20thDay
11%228%17%60%
2445
21st to endDay
14%2311%23%47%
2387
August1st to 10thDay
9%116%16%67%
2135
11th to 20thDay
7%115%21%65%
2122
21st to endDay
6%11421%66%
2376
September1st to 10thDay
9%215%15%68%
2160
11th to 20thDay
4116%27%61%
2012
21st to endDay
5%117%30%57%
1980
October1st to 10thDay
9%1311%29%46%
1980
11th to 20thDay
8%139%31%49%
1877
21st to endDay
8%1212%32%46%
1877
November1st to 10thDay
8%2415%42%29%
1674
11th to 20thDay
11%25%22%33%27%
1710
21st to endDay
12%27%21%33%26%
1710
December1st to 10thDay
17%49%25%27%18%
1710
11th to 20thDay
27%6%10%22%25%10%
2168
21st to endDay
30%5%12%27%18%8%
2822
January1st to 10thNight
19%39%28%32%9%
2646
11th to 20thNight
16%28%29%29%17%
2528
21st to endNight
19%36%22%32%18%
2402
February1st to 10thNight
17%28%19%28%25%
2160
11th to 20thNight
15%25%19%32%27%
2099
21st to endNight
15%36%24%33%19%
1776
March1st to 10thNight
15%37%24%31%20%
2160
11th to 20thNight
14%39%19%32%22%
2111
21st to endNight
12%37%28%33%16%
1994
April1st to 10thNight
13%26%26%31%22%
1800
11th to 20thNight
10%3423%34%26%
1779
21st to endNight
9%2422%42%22%
1800
May1st to 10thNight
6%2320%37%31%
1656
11th to 20thNight
6%1317%39%34%
1595
21st to endNight
5%2419%40%29%
1746
June1st to 10thNight
6%1314%29%47%
1530
11th to 20thNight
42210%21%61%
1440
21st to endNight
5%11415%74%
1440
July1st to 10thNight
6%11414%75%
1400
11th to 20thNight
10%228%18%60%
1392
21st to endNight
13%2210%26%48%
1684
August1st to 10thNight
8%227%19%62%
1780
11th to 20thNight
5%216%20%65%
1780
21st to endNight
7%1423%65%
1980
September1st to 10thNight
8%115%19%65%
1800
11th to 20thNight
4117%30%57%
1948
21st to endNight
4116%30%59%
1980
October1st to 10thNight
7%1410%28%49%
1980
11th to 20thNight
8%1310%30%48%
2078
21st to endNight
7%2310%28%50%
2479
November1st to 10thNight
9%2316%39%32%
2405
11th to 20thNight
10%25%17%31%35%
2470
21st to endNight
13%15%22%30%30%
2470
December1st to 10thNight
17%39%20%29%22%
2470
11th to 20thNight
21%5%12%24%26%11%
3041
21st to endNight
26%6%12%28%20%8%
4814

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
9%417%36%26%8%
180
11th to 20thDay
13%7%14%25%25%15%
202
21st to endDay
9%8%18%28%24%13%
448
February1st to 10thDay
7%11%16%30%24%12%
420
11th to 20thDay
8%13%21%31%18%9%
415
21st to endDay
11%12%21%32%19%4
346
March1st to 10thDay
14%17%15%28%19%6%
420
11th to 20thDay
9%14%25%26%18%8%
420
21st to endDay
8%17%25%33%14%3
462
April1st to 10thDay
10%11%24%25%22%8%
420
11th to 20thDay
6%18%26%26%19%5%
412
21st to endDay
6%13%24%25%19%13%
420
May1st to 10thDay
6%15%27%23%20%8%
423
11th to 20thDay
5%12%23%28%21%12%
448
21st to endDay
5%13%17%24%28%13%
485
June1st to 10thDay
47%22%25%24%19%
450
11th to 20thDay
37%23%23%29%16%
450
21st to endDay
26%21%26%26%19%
450
July1st to 10thDay
2316%29%29%22%
446
11th to 20thDay
2112%30%26%29%
444
21st to endDay
319%34%30%24%
487
August1st to 10thDay
2216%33%24%22%
447
11th to 20thDay
2210%30%31%25%
437
21st to endDay
1112%30%37%19%
495
September1st to 10thDay
2315%26%33%22%
450
11th to 20thDay
17%16%27%35%13%
450
21st to endDay
36%15%26%33%17%
450
October1st to 10thDay
46%18%27%30%15%
450
11th to 20thDay
35%16%28%33%15%
450
21st to endDay
37%10%30%29%21%
392
November1st to 10thDay
410%9%31%33%13%
270
11th to 20thDay
249%37%33%16%
270
21st to endDay
46%14%30%30%15%
270
December1st to 10thDay
4414%40%29%9%
270
11th to 20thDay
3413%41%26%12%
270
21st to endDay
12%5%17%38%20%8%
205
January1st to 10thNight
6%5%16%43%27%4
760
11th to 20thNight
3418%48%26%1
734
21st to endNight
6%5%20%43%22%3
792
February1st to 10thNight
36%21%42%25%3
720
11th to 20thNight
38%21%40%24%3
704
21st to endNight
6%10%22%43%18%1
592
March1st to 10thNight
414%23%40%18%1
720
11th to 20thNight
5%10%25%33%24%3
720
21st to endNight
313%28%39%17%1
792
April1st to 10thNight
312%27%34%21%2
720
11th to 20thNight
314%27%36%20%1
711
21st to endNight
311%25%35%22%4
720
May1st to 10thNight
213%31%34%18%2
576
11th to 20thNight
210%25%36%26%1
531
21st to endNight
211%26%40%20%1
584
June1st to 10thNight
16%26%41%24%2
450
11th to 20thNight
1425%44%24%2
360
21st to endNight
1319%49%26%2
360
July1st to 10thNight
1112%41%40%4
350
11th to 20thNight
39%47%38%3
348
21st to endNight
18%47%40%3
601
August1st to 10thNight
3114%41%38%4
716
11th to 20thNight
1111%37%44%6%
712
21st to endNight
2111%36%42%8%
792
September1st to 10thNight
1211%33%47%7%
720
11th to 20thNight
217%36%40%5%
720
21st to endNight
1414%34%41%7%
720
October1st to 10thNight
1418%41%33%3
720
11th to 20thNight
15%12%37%39%5%
720
21st to endNight
2415%35%38%6%
792
November1st to 10thNight
17%14%38%36%4
740
11th to 20thNight
1410%46%34%4
760
21st to endNight
3317%42%32%3
760
December1st to 10thNight
6%6%13%46%27%3
760
11th to 20thNight
5%5%18%45%25%2
760
21st to endNight
6%420%44%22%3
836
Page generated at 2024-01-11 01:22:40. Version ac07

Copyright 2024 Attilla Danko


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