Pinnacles Campground
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pinnacles Campground clear sky chart from 2005-11-06 to 2024-03-18.

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%
24100
29%
80530
27%
24013
74%
24013
40%
42443

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
55%
750
22%
4214
21%
736
60%
736
17%
2389
January11th to 20thNight
62%
750
17%
4068
23%
740
68%
740
16%
2638
January21st to endNight
59%
829
16%
4432
25%
814
64%
814
15%
2939
February1st to 10thNight
58%
760
26%
2470
24%
760
65%
760
31%
1431
February11th to 20thNight
59%
740
28%
2224
27%
740
65%
740
37%
1254
February21st to endNight
56%
628
24%
1884
22%
628
61%
628
34%
1112
March1st to 10thNight
50%
760
18%
2190
15%
760
55%
760
24%
1454
March11th to 20thNight
56%
752
22%
2067
19%
752
60%
752
32%
1302
March21st to endNight
54%
792
22%
2103
15%
792
60%
792
37%
1273
April1st to 10thNight
55%
720
25%
1800
14%
720
60%
720
39%
1114
April11th to 20thNight
55%
711
30%
1779
14%
711
61%
711
45%
1007
April21st to endNight
60%
720
29%
1800
13%
720
66%
720
55%
968
May1st to 10thNight
64%
720
29%
1800
17%
720
67%
720
56%
951
May11th to 20thNight
73%
512
34%
1574
26%
512
76%
512
54%
727
May21st to endNight
71%
389
32%
1552
31%
388
80%
388
50%
616
June1st to 10thNight
78%
360
32%
1440
35%
360
84%
360
52%
545
June11th to 20thNight
79%
360
40%
1440
42%
360
88%
360
67%
470
June21st to endNight
89%
360
42%
1440
50%
360
92%
360
84%
409
July1st to 10thNight
91%
350
40%
1400
47%
350
94%
350
86%
390
July11th to 20thNight
92%
481
38%
1525
36%
481
93%
481
77%
561
July21st to endNight
92%
591
43%
1674
37%
558
94%
558
78%
648
August1st to 10thNight
89%
562
40%
1627
31%
559
90%
559
75%
657
August11th to 20thNight
90%
712
42%
1780
26%
712
91%
712
85%
779
August21st to endNight
92%
792
45%
1980
30%
792
93%
792
85%
863
September1st to 10thNight
89%
720
46%
1800
33%
720
90%
720
79%
820
September11th to 20thNight
85%
720
46%
1800
36%
720
89%
720
75%
841
September21st to endNight
82%
720
44%
2004
41%
720
87%
720
75%
849
October1st to 10thNight
76%
720
34%
2160
34%
720
82%
720
57%
987
October11th to 20thNight
77%
720
39%
2160
41%
720
82%
720
56%
997
October21st to endNight
78%
792
42%
2376
44%
792
82%
792
59%
1080
November1st to 10thNight
72%
740
33%
2290
34%
740
76%
740
46%
1151
November11th to 20thNight
70%
760
30%
2470
29%
760
75%
760
42%
1237
November21st to endNight
66%
760
31%
2484
30%
760
72%
760
41%
1256
December1st to 10thNight
62%
760
26%
2660
26%
760
67%
760
31%
1484
December11th to 20thNight
56%
760
20%
3233
23%
759
61%
759
18%
2190
December21st to endNight
50%
827
13%
4830
20%
817
58%
817
14%
3054

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
6%423323346%64%
78826
Night
8%5%24323447%59%
80992
TransparencyDay
22%5%8%17%25%23%
78545
Night
25%6%10%18%23%19%
80794
SeeingDay
8%9%22%30%23%9%
14547
Night
7%414%34%32%9%
24140

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
11%9%36%43445%7%45%
2674
11th to 20thDay
13%8%36%6%35%6%6%6%38%
2860
21st to endDay
16%10%46%6%35%5%5%7%34%
3146
February1st to 10thDay
14%7%243245%46%49%
1710
11th to 20thDay
11%6%35%4245%5%7%48%
1842
21st to endDay
12%8%36%434446%47%
1570
March1st to 10thDay
13%8%46%5%346%7%8%37%
1986
11th to 20thDay
12%7%35%5%345%6%9%42%
2059
21st to endDay
9%5%35%5%245%5%8%49%
2251
April1st to 10thDay
9%5%244245%5%9%50%
2160
11th to 20thDay
7%42432345%6%59%
2129
21st to endDay
5%32432335%7%63%
2160
May1st to 10thDay
3423313447%66%
2160
11th to 20thDay
321321335%8%70%
2310
21st to endDay
3314223447%67%
2723
June1st to 10thDay
2212323348%71%
2520
11th to 20thDay
1111111226%84%
2520
21st to endDay
11111222387%
2520
July1st to 10thDay
1111123487%
2520
11th to 20thDay
111111112485%
2379
21st to endDay
1111211235%83%
2546
August1st to 10thDay
111211223384%
2303
11th to 20thDay
111112489%
2122
21st to endDay
1111122388%
2376
September1st to 10thDay
11111121289%
2160
11th to 20thDay
211112226%81%
2160
21st to endDay
211111223481%
1949
October1st to 10thDay
2312322445%72%
1800
11th to 20thDay
3213322247%71%
1800
21st to endDay
431232335%5%70%
1980
November1st to 10thDay
6%32442445%7%59%
1788
11th to 20thDay
5%42432445%8%60%
1710
21st to endDay
8%423423448%57%
1691
December1st to 10thDay
10%6%24435%46%8%47%
1520
11th to 20thDay
25%8%3442446%7%32%
1928
21st to endDay
15%9%35%5%35%45%7%38%
2794
January1st to 10thNight
11%6%36%5%2445%6%47%
4272
11th to 20thNight
15%9%35%435%5%6%8%38%
4110
21st to endNight
17%11%35%5%345%47%36%
4521
February1st to 10thNight
14%6%24323445%51%
2470
11th to 20thNight
9%6%2442445%9%51%
2223
21st to endNight
9%8%35%42445%7%50%
1884
March1st to 10thNight
12%8%36%5%45%5%5%7%41%
2190
11th to 20thNight
9%7%35%435%45%10%45%
2067
21st to endNight
10%6%34424348%52%
2103
April1st to 10thNight
8%5%244345%5%8%53%
1800
11th to 20thNight
5%42342445%6%61%
1779
21st to endNight
332332346%9%63%
1800
May1st to 10thNight
232332335%8%66%
1800
11th to 20thNight
221332335%10%66%
1574
21st to endNight
2222213447%71%
1552
June1st to 10thNight
221221335%7%70%
1440
11th to 20thNight
121111323482%
1440
21st to endNight
111123488%
1440
July1st to 10thNight
1111135%87%
1440
11th to 20thNight
11111222484%
1576
21st to endNight
11211336%82%
1773
August1st to 10thNight
111221223482%
1636
11th to 20thNight
111222487%
1780
21st to endNight
11111222387%
1980
September1st to 10thNight
221222386%
1800
11th to 20thNight
1112212236%80%
1800
21st to endNight
12212225%82%
2004
October1st to 10thNight
4312213235%73%
2160
11th to 20thNight
3312323448%69%
2160
21st to endNight
4312122336%73%
2376
November1st to 10thNight
4423423347%63%
2290
11th to 20thNight
6%324433449%59%
2470
21st to endNight
6%42432445%7%58%
2484
December1st to 10thNight
11%5%2432445%7%52%
2660
11th to 20thNight
21%9%35%5%3446%6%35%
3276
21st to endNight
15%9%36%5%35%5%5%7%36%
4862

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
37%9%12%26%13%3
2674
11th to 20thDay
42%9%11%17%12%9%
2860
21st to endDay
47%6%10%17%14%6%
3146
February1st to 10thDay
35%5%8%18%20%14%
1710
11th to 20thDay
33%7%10%19%22%10%
1852
21st to endDay
37%6%8%20%21%7%
1570
March1st to 10thDay
41%7%11%18%17%6%
1986
11th to 20thDay
36%6%12%19%19%7%
2059
21st to endDay
32%7%13%23%18%6%
2251
April1st to 10thDay
30%6%12%22%21%9%
2160
11th to 20thDay
24%6%10%27%24%9%
2132
21st to endDay
20%5%10%31%28%7%
2160
May1st to 10thDay
17%410%23%35%11%
2160
11th to 20thDay
14%49%25%36%13%
2313
21st to endDay
17%6%11%28%31%8%
2724
June1st to 10thDay
13%411%23%30%19%
2520
11th to 20thDay
6%26%17%37%32%
2520
21st to endDay
7%238%29%51%
2520
July1st to 10thDay
4136%22%63%
2451
11th to 20thDay
7%15%8%25%54%
2307
21st to endDay
7%149%25%55%
2405
August1st to 10thDay
8%139%25%55%
2287
11th to 20thDay
3138%31%53%
2122
21st to endDay
5%148%33%49%
2376
September1st to 10thDay
5%137%27%56%
2160
11th to 20thDay
8%26%16%39%29%
2160
21st to endDay
8%2416%42%27%
1949
October1st to 10thDay
14%47%18%25%33%
1800
11th to 20thDay
15%36%22%25%29%
1800
21st to endDay
17%36%18%30%26%
1980
November1st to 10thDay
23%412%16%25%20%
1788
11th to 20thDay
22%7%10%19%27%14%
1710
21st to endDay
24%6%9%17%28%15%
1691
December1st to 10thDay
31%8%10%17%20%15%
1520
11th to 20thDay
50%6%9%14%15%7%
1928
21st to endDay
43%9%12%19%12%5%
2794
January1st to 10thNight
36%10%13%23%14%3
4272
11th to 20thNight
42%11%13%16%11%8%
4110
21st to endNight
46%8%11%15%13%6%
4521
February1st to 10thNight
34%5%9%18%21%13%
2470
11th to 20thNight
28%6%12%21%25%8%
2224
21st to endNight
32%6%11%26%18%7%
1884
March1st to 10thNight
41%8%11%19%15%6%
2190
11th to 20thNight
34%7%12%19%19%9%
2067
21st to endNight
30%7%13%26%18%6%
2103
April1st to 10thNight
28%8%15%23%19%7%
1800
11th to 20thNight
21%7%14%27%24%7%
1779
21st to endNight
16%6%13%30%27%7%
1800
May1st to 10thNight
16%5%11%24%31%13%
1800
11th to 20thNight
15%6%8%23%40%9%
1574
21st to endNight
13%6%11%32%31%7%
1552
June1st to 10thNight
12%5%11%21%33%17%
1440
11th to 20thNight
8%36%19%35%30%
1440
21st to endNight
31411%33%48%
1440
July1st to 10thNight
338%23%63%
1400
11th to 20thNight
6%25%8%24%55%
1525
21st to endNight
7%25%9%27%51%
1674
August1st to 10thNight
9%149%26%52%
1627
11th to 20thNight
5%138%30%52%
1780
21st to endNight
5%148%34%48%
1980
September1st to 10thNight
7%237%24%57%
1800
11th to 20thNight
9%36%17%32%34%
1800
21st to endNight
9%15%17%41%27%
2004
October1st to 10thNight
15%46%18%26%30%
2160
11th to 20thNight
15%48%16%29%27%
2160
21st to endNight
14%45%20%30%27%
2376
November1st to 10thNight
21%6%9%18%26%20%
2290
11th to 20thNight
22%6%12%18%28%14%
2470
21st to endNight
24%5%10%16%28%16%
2484
December1st to 10thNight
32%6%9%17%22%14%
2660
11th to 20thNight
48%6%10%15%14%6%
3276
21st to endNight
44%9%16%16%10%5%
4862

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
26%12%28%18%13%3
263
11th to 20thDay
13%9%24%27%20%7%
370
21st to endDay
13%11%22%27%21%5%
407
February1st to 10thDay
17%16%21%21%16%8%
370
11th to 20thDay
17%13%24%26%17%3
452
21st to endDay
12%15%28%30%13%2
382
March1st to 10thDay
20%13%25%28%12%2
460
11th to 20thDay
18%14%26%25%14%4
449
21st to endDay
15%15%32%26%10%2
462
April1st to 10thDay
13%16%27%26%15%3
420
11th to 20thDay
11%17%30%25%13%4
412
21st to endDay
5%18%30%26%13%7%
420
May1st to 10thDay
9%12%32%26%15%5%
423
11th to 20thDay
6%11%33%29%14%6%
448
21st to endDay
6%11%25%31%19%8%
485
June1st to 10thDay
38%29%30%21%10%
450
11th to 20thDay
38%23%37%20%9%
450
21st to endDay
15%22%33%27%12%
450
July1st to 10thDay
1117%37%31%13%
446
11th to 20thDay
110%36%34%18%
444
21st to endDay
1111%37%33%18%
487
August1st to 10thDay
2217%38%28%13%
447
11th to 20thDay
1115%33%33%18%
437
21st to endDay
110%34%36%19%
495
September1st to 10thDay
1413%33%31%18%
450
11th to 20thDay
35%20%34%28%10%
450
21st to endDay
35%14%31%36%11%
450
October1st to 10thDay
37%22%33%26%8%
450
11th to 20thDay
48%18%30%27%12%
450
21st to endDay
6%8%21%26%27%11%
495
November1st to 10thDay
6%9%20%25%31%9%
384
11th to 20thDay
39%19%28%31%10%
270
21st to endDay
10%421%34%26%5%
261
December1st to 10thDay
14%8%22%26%23%7%
180
11th to 20thDay
13%12%21%25%21%8%
180
21st to endDay
18%15%19%23%19%6%
198
January1st to 10thNight
16%5%15%34%22%8%
760
11th to 20thNight
11%415%38%26%7%
760
21st to endNight
14%416%36%24%6%
836
February1st to 10thNight
16%5%15%34%23%7%
760
11th to 20thNight
10%8%18%33%24%6%
744
21st to endNight
12%6%19%41%19%3
628
March1st to 10thNight
13%8%19%36%20%4
760
11th to 20thNight
11%7%19%35%23%6%
752
21st to endNight
11%7%20%36%22%4
792
April1st to 10thNight
10%6%21%38%21%3
720
11th to 20thNight
6%11%21%34%21%6%
711
21st to endNight
38%26%30%27%7%
720
May1st to 10thNight
37%22%36%25%8%
720
11th to 20thNight
3318%38%32%6%
512
21st to endNight
3417%35%35%6%
389
June1st to 10thNight
2315%42%33%5%
360
11th to 20thNight
1114%42%35%6%
360
21st to endNight
19%40%41%9%
360
July1st to 10thNight
17%32%51%9%
350
11th to 20thNight
1322%56%17%
481
21st to endNight
319%59%18%
591
August1st to 10thNight
15%29%50%14%
562
11th to 20thNight
16%33%47%13%
712
21st to endNight
1426%56%13%
792
September1st to 10thNight
117%31%47%14%
720
11th to 20thNight
1110%36%40%12%
720
21st to endNight
2111%32%42%13%
720
October1st to 10thNight
5%312%36%34%10%
720
11th to 20thNight
5%39%36%34%12%
720
21st to endNight
5%212%32%32%18%
792
November1st to 10thNight
5%5%11%37%31%11%
740
11th to 20thNight
7%313%37%32%8%
760
21st to endNight
7%317%37%28%8%
760
December1st to 10thNight
12%415%40%23%7%
760
11th to 20thNight
15%5%16%39%23%3
760
21st to endNight
15%8%20%33%20%4
836
Page generated at 2024-03-15 11:01:38. Version ac07

Copyright © 2024 Attilla Danko.


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