Pioneertown Mountains Preserve
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pioneertown Mountains Preserve 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%
24801
40%
74416
30%
24755
79%
24755
62%
32085

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
56%
757
34%
2457
25%
756
69%
756
46%
1129
January11th to 20thNight
58%
732
40%
2361
30%
732
73%
732
49%
1047
January21st to endNight
50%
792
42%
2376
25%
792
70%
792
46%
1138
February1st to 10thNight
55%
720
40%
2160
27%
720
73%
720
50%
1001
February11th to 20thNight
54%
700
40%
2098
27%
700
72%
700
53%
956
February21st to endNight
50%
592
40%
1776
29%
592
68%
592
54%
791
March1st to 10thNight
52%
720
34%
2160
24%
720
69%
720
47%
1026
March11th to 20thNight
61%
720
38%
2051
27%
720
75%
720
61%
908
March21st to endNight
56%
792
39%
2102
22%
792
71%
792
56%
1015
April1st to 10thNight
57%
720
40%
1800
19%
720
68%
720
58%
914
April11th to 20thNight
56%
711
42%
1779
18%
711
69%
711
68%
831
April21st to endNight
65%
720
44%
1800
21%
720
75%
720
75%
804
May1st to 10thNight
67%
540
44%
1620
28%
540
75%
540
74%
616
May11th to 20thNight
73%
531
43%
1595
30%
531
79%
531
77%
606
May21st to endNight
72%
582
41%
1746
30%
582
78%
582
81%
644
June1st to 10thNight
77%
540
38%
1620
30%
540
81%
540
77%
629
June11th to 20thNight
77%
540
40%
1620
33%
540
80%
540
82%
604
June21st to endNight
82%
540
38%
1620
32%
540
85%
540
78%
635
July1st to 10thNight
89%
525
37%
1575
33%
525
90%
525
79%
601
July11th to 20thNight
85%
522
36%
1566
31%
522
85%
522
66%
672
July21st to endNight
86%
591
37%
1674
32%
558
86%
558
60%
752
August1st to 10thNight
90%
714
38%
1779
25%
711
91%
711
78%
819
August11th to 20thNight
93%
712
42%
1780
27%
712
94%
712
80%
809
August21st to endNight
90%
792
45%
1980
32%
792
90%
792
77%
908
September1st to 10thNight
88%
720
43%
1834
32%
720
90%
720
74%
851
September11th to 20thNight
88%
720
49%
1980
41%
720
94%
720
88%
776
September21st to endNight
84%
720
48%
1980
39%
720
91%
720
83%
798
October1st to 10thNight
75%
720
44%
1980
34%
720
84%
720
72%
856
October11th to 20thNight
79%
720
51%
1980
42%
720
87%
720
78%
818
October21st to endNight
72%
792
45%
2492
40%
792
84%
792
70%
943
November1st to 10thNight
72%
740
42%
2405
37%
740
84%
740
67%
922
November11th to 20thNight
72%
760
43%
2470
37%
760
85%
760
66%
960
November21st to endNight
62%
760
41%
2470
34%
760
76%
760
53%
1076
December1st to 10thNight
61%
760
38%
2470
29%
760
74%
760
50%
1103
December11th to 20thNight
55%
759
36%
2899
27%
758
69%
758
40%
1334
December21st to endNight
49%
825
24%
4361
25%
817
66%
817
30%
1793

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
2212213346%75%
74862
Night
1112212346%76%
74924
TransparencyDay
12%35%15%28%38%
74590
Night
12%35%16%29%37%
74719
SeeingDay
5%14%28%32%16%5%
14437
Night
36%19%34%30%8%
24822

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
2313324347%67%
1708
11th to 20thDay
431222345%7%68%
1656
21st to endDay
3312324346%68%
1980
February1st to 10thDay
2313323335%71%
1800
11th to 20thDay
1112323347%72%
1750
21st to endDay
1212323348%70%
1480
March1st to 10thDay
221231336%8%69%
1800
11th to 20thDay
211332335%7%71%
1908
21st to endDay
11211245%7%75%
2250
April1st to 10thDay
2222223246%73%
2160
11th to 20thDay
122212235%81%
2129
21st to endDay
1111211236%80%
2160
May1st to 10thDay
1111212236%80%
2340
11th to 20thDay
1111211235%83%
2301
21st to endDay
11111133483%
2530
June1st to 10thDay
121111225%82%
2340
11th to 20thDay
11112389%
2340
21st to endDay
211111222284%
2340
July1st to 10thDay
2212212335%77%
2340
11th to 20thDay
3212223447%71%
2340
21st to endDay
32233345%6%8%62%
2543
August1st to 10thDay
2212223335%76%
2149
11th to 20thDay
11121345%7%75%
2122
21st to endDay
2111213236%78%
2376
September1st to 10thDay
3112323335%74%
2124
11th to 20thDay
1111112389%
1980
21st to endDay
11221222384%
1980
October1st to 10thDay
1211212335%80%
1980
11th to 20thDay
111111122486%
1980
21st to endDay
1111111135%84%
1857
November1st to 10thDay
11213336%80%
1674
11th to 20thDay
111121235%7%75%
1710
21st to endDay
3212323346%72%
1710
December1st to 10thDay
231342345%8%65%
1710
11th to 20thDay
241442445%11%59%
2169
21st to endDay
43143345%6%10%56%
3146
January1st to 10thNight
131333445%8%66%
2457
11th to 20thNight
221232345%7%68%
2361
21st to endNight
3224323346%68%
2376
February1st to 10thNight
2212423345%72%
2160
11th to 20thNight
2212323446%72%
2098
21st to endNight
121122336%10%70%
1776
March1st to 10thNight
331221345%8%67%
2160
11th to 20thNight
11122145%5%8%71%
2051
21st to endNight
1213213347%74%
2102
April1st to 10thNight
1222323335%74%
1800
11th to 20thNight
111121222482%
1779
21st to endNight
111111226%84%
1800
May1st to 10thNight
11111236%84%
1620
11th to 20thNight
11112235%85%
1594
21st to endNight
1111112488%
1746
June1st to 10thNight
11121122486%
1620
11th to 20thNight
111211389%
1620
21st to endNight
11111122387%
1620
July1st to 10thNight
111111223384%
1620
11th to 20thNight
2113223346%75%
1620
21st to endNight
2212212447%72%
1773
August1st to 10thNight
211211233482%
1788
11th to 20thNight
111111335%82%
1780
21st to endNight
21121123483%
1980
September1st to 10thNight
11221224481%
1834
11th to 20thNight
11111292%
1980
21st to endNight
1111112390%
1980
October1st to 10thNight
111121223482%
1980
11th to 20thNight
211111112388%
1980
21st to endNight
1112235%83%
2492
November1st to 10thNight
1111212235%82%
2405
11th to 20thNight
111121335%5%79%
2470
21st to endNight
2113323446%73%
2470
December1st to 10thNight
321232335%8%68%
2470
11th to 20thNight
231342346%10%61%
3041
21st to endNight
32134346%6%8%60%
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
18%46%22%30%20%
1709
11th to 20thDay
17%48%17%33%23%
1656
21st to endDay
19%36%22%29%21%
1980
February1st to 10thDay
17%35%16%29%30%
1800
11th to 20thDay
13%36%18%31%28%
1760
21st to endDay
15%37%20%32%24%
1480
March1st to 10thDay
15%36%22%32%22%
1800
11th to 20thDay
15%36%21%31%23%
1908
21st to endDay
10%38%26%31%22%
2250
April1st to 10thDay
15%36%21%33%23%
2160
11th to 20thDay
9%2315%36%35%
2132
21st to endDay
8%2418%36%32%
2160
May1st to 10thDay
9%2318%35%34%
2340
11th to 20thDay
7%2312%37%40%
2304
21st to endDay
8%2416%35%36%
2530
June1st to 10thDay
8%1211%29%49%
2340
11th to 20thDay
3228%19%67%
2340
21st to endDay
9%215%12%71%
2340
July1st to 10thDay
12%226%16%62%
2276
11th to 20thDay
14%35%15%25%38%
2271
21st to endDay
19%5%8%17%23%29%
2402
August1st to 10thDay
12%2410%20%52%
2135
11th to 20thDay
9%4414%21%48%
2122
21st to endDay
11%2310%26%48%
2376
September1st to 10thDay
13%448%18%52%
2124
11th to 20thDay
4116%27%60%
1980
21st to endDay
9%1111%26%52%
1980
October1st to 10thDay
10%2312%28%44%
1980
11th to 20thDay
7%2210%31%49%
1980
21st to endDay
7%2310%27%51%
1857
November1st to 10thDay
9%2316%34%36%
1674
11th to 20thDay
11%35%16%27%38%
1710
21st to endDay
14%25%16%32%30%
1710
December1st to 10thDay
19%48%19%25%25%
1710
11th to 20thDay
23%411%22%24%16%
2168
21st to endDay
25%312%22%25%13%
3146
January1st to 10thNight
18%48%21%30%20%
2457
11th to 20thNight
17%35%20%30%24%
2361
21st to endNight
19%37%19%28%24%
2376
February1st to 10thNight
17%35%18%25%33%
2160
11th to 20thNight
15%35%18%29%29%
2099
21st to endNight
12%5%7%20%29%27%
1776
March1st to 10thNight
16%5%6%21%30%22%
2160
11th to 20thNight
11%37%22%30%26%
2051
21st to endNight
12%46%21%37%20%
2102
April1st to 10thNight
14%4423%31%23%
1800
11th to 20thNight
9%2416%33%36%
1779
21st to endNight
6%2316%42%31%
1800
May1st to 10thNight
5%2419%33%37%
1620
11th to 20thNight
6%2413%37%38%
1595
21st to endNight
41318%39%35%
1746
June1st to 10thNight
7%1211%27%52%
1620
11th to 20thNight
4218%20%65%
1620
21st to endNight
7%115%15%71%
1620
July1st to 10thNight
7%116%19%66%
1575
11th to 20thNight
12%25%16%22%42%
1566
21st to endNight
14%47%20%24%31%
1674
August1st to 10thNight
8%2410%23%53%
1779
11th to 20thNight
6%3313%28%48%
1780
21st to endNight
9%218%28%52%
1980
September1st to 10thNight
9%348%22%55%
1834
11th to 20thNight
3127%26%62%
1980
21st to endNight
5%128%29%56%
1980
October1st to 10thNight
9%2312%31%43%
1980
11th to 20thNight
7%128%32%50%
1980
21st to endNight
7%238%27%52%
2492
November1st to 10thNight
9%2413%36%37%
2405
11th to 20thNight
9%3416%30%38%
2470
21st to endNight
15%35%18%30%30%
2470
December1st to 10thNight
17%46%20%25%28%
2470
11th to 20thNight
21%410%21%26%18%
3041
21st to endNight
21%5%10%23%27%14%
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
11%17%27%32%11%2
270
11th to 20thDay
14%15%25%31%13%2
262
21st to endDay
10%22%31%26%9%2
462
February1st to 10thDay
6%23%30%27%10%4
420
11th to 20thDay
9%26%33%22%9%1
415
21st to endDay
9%30%30%24%7%
346
March1st to 10thDay
11%27%32%20%10%
420
11th to 20thDay
9%20%34%24%11%1
420
21st to endDay
11%23%37%23%5%2
462
April1st to 10thDay
8%18%31%26%14%3
420
11th to 20thDay
6%27%33%21%10%2
412
21st to endDay
6%22%30%26%11%5%
420
May1st to 10thDay
5%17%36%28%11%4
423
11th to 20thDay
217%31%34%11%5%
448
21st to endDay
317%31%31%13%5%
485
June1st to 10thDay
411%30%33%17%6%
450
11th to 20thDay
19%30%34%16%9%
450
21st to endDay
38%29%36%16%8%
450
July1st to 10thDay
1323%44%20%9%
446
11th to 20thDay
317%47%20%12%
444
21st to endDay
4216%43%22%12%
487
August1st to 10thDay
3324%39%22%9%
447
11th to 20thDay
2218%42%26%11%
437
21st to endDay
1222%40%24%11%
495
September1st to 10thDay
4422%44%22%5%
450
11th to 20thDay
28%29%36%22%3
450
21st to endDay
310%26%33%22%7%
450
October1st to 10thDay
310%34%32%17%3
450
11th to 20thDay
28%31%38%20%2
450
21st to endDay
213%29%31%21%4
349
November1st to 10thDay
415%23%34%22%3
270
11th to 20thDay
311%27%34%21%3
270
21st to endDay
7%14%28%31%17%3
270
December1st to 10thDay
5%16%29%33%15%2
270
11th to 20thDay
6%17%22%35%18%2
270
21st to endDay
6%23%31%24%14%2
297
January1st to 10thNight
6%10%24%31%20%9%
760
11th to 20thNight
49%25%35%21%7%
732
21st to endNight
6%11%26%33%19%4
792
February1st to 10thNight
411%24%33%22%6%
720
11th to 20thNight
5%10%28%33%19%5%
704
21st to endNight
5%9%34%32%15%4
592
March1st to 10thNight
412%28%35%18%3
720
11th to 20thNight
210%24%31%24%9%
720
21st to endNight
412%24%37%19%4
792
April1st to 10thNight
210%26%35%22%5%
720
11th to 20thNight
210%29%32%21%6%
711
21st to endNight
28%23%35%24%8%
720
May1st to 10thNight
19%22%41%24%4
540
11th to 20thNight
5%19%38%31%6%
531
21st to endNight
15%21%40%26%6%
584
June1st to 10thNight
317%44%31%5%
540
11th to 20thNight
219%41%35%4
540
21st to endNight
1213%41%38%5%
540
July1st to 10thNight
25%34%48%10%
525
11th to 20thNight
36%35%47%9%
522
21st to endNight
32333%51%8%
591
August1st to 10thNight
115%32%46%15%
714
11th to 20thNight
11326%53%16%
712
21st to endNight
31325%48%20%
792
September1st to 10thNight
215%28%49%14%
720
11th to 20thNight
9%34%44%13%
720
21st to endNight
1212%34%41%11%
720
October1st to 10thNight
2218%40%34%5%
720
11th to 20thNight
2312%39%34%9%
720
21st to endNight
17%16%33%30%13%
792
November1st to 10thNight
18%17%36%29%9%
740
11th to 20thNight
25%18%37%29%9%
760
21st to endNight
48%22%34%24%8%
760
December1st to 10thNight
37%24%37%22%6%
760
11th to 20thNight
5%8%26%34%22%5%
760
21st to endNight
5%14%28%31%17%5%
836
Page generated at 2024-01-10 16:35:25. Version ac07

Copyright 2024 Attilla Danko


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