Pinnacles Campground
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pinnacles Campground clear sky chart from 2005-11-05 to 2017-10-16.

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
73%
15626
30%
47244
28%
15589
76%
15589
46%
24073

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
66%
716
22%
2392
23%
716
69%
716
33%
1337
January16th to endNight
64%
768
25%
2496
27%
768
66%
768
30%
1482
February1st to 15thNight
63%
700
25%
2235
25%
700
67%
700
31%
1316
February16th to endNight
59%
632
24%
1895
23%
632
64%
632
32%
1154
March1st to 15thNight
62%
720
20%
2043
18%
720
65%
720
31%
1277
March16th to endNight
59%
768
22%
2061
18%
768
63%
768
38%
1231
April1st to 15thNight
56%
719
24%
1799
14%
719
59%
719
37%
1129
April16th to endNight
63%
720
27%
1800
13%
720
67%
720
53%
981
May1st to 15thNight
72%
701
28%
1781
18%
701
74%
701
59%
916
May16th to endNight
75%
377
31%
1498
32%
376
82%
376
49%
600
June1st to 15thNight
78%
360
31%
1440
34%
360
84%
360
52%
554
June16th to endNight
91%
360
41%
1440
50%
360
94%
360
83%
410
July1st to 15thNight
95%
369
35%
1389
42%
369
95%
369
78%
434
July16th to endNight
92%
564
40%
1593
35%
531
93%
531
75%
629
August1st to 15thNight
93%
616
39%
1689
29%
613
93%
613
80%
698
August16th to endNight
93%
764
46%
1910
30%
764
94%
764
85%
831
September1st to 15thNight
92%
720
43%
1800
33%
720
93%
720
76%
839
September16th to endNight
85%
716
47%
1938
42%
716
88%
716
74%
847
October1st to 15thNight
75%
720
32%
2160
34%
720
79%
720
52%
1036
October16th to endNight
77%
708
38%
2124
41%
708
81%
708
55%
1001
November1st to 15thNight
76%
700
32%
2204
34%
700
79%
700
46%
1111
November16th to endNight
69%
720
28%
2349
28%
720
72%
720
41%
1202
December1st to 15thNight
63%
720
25%
2520
26%
720
67%
720
28%
1477
December16th to endNight
56%
768
23%
2688
22%
768
62%
768
26%
1581

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
5%312213346%64%
48170
Night
6%313313347%61%
47432
TransparencyDay
20%47%17%26%23%
47856
Night
21%49%18%25%20%
47245
SeeingDay
8%8%22%30%21%8%
6128
Night
6%311%32%34%11%
15635

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
10%5%25%42345%6%48%
1544
16th to endDay
13%5%345%245%45%45%
1728
February1st to 15thDay
13%6%24313446%48%
1625
16th to endDay
15%7%35%42445%6%40%
1579
March1st to 15thDay
9%6%35%5%245%6%10%41%
1914
16th to endDay
9%5%345%245%6%8%45%
2162
April1st to 15thDay
11%6%24313448%48%
2149
16th to endDay
6%313323346%60%
2160
May1st to 15thDay
221321235%7%67%
2166
16th to endDay
3213213348%65%
2610
June1st to 15thDay
2212212248%69%
2520
16th to endDay
111387%
2520
July1st to 15thDay
11112485%
2486
16th to endDay
111122483%
2468
August1st to 15thDay
11112385%
2262
16th to endDay
112388%
2292
September1st to 15thDay
1111112385%
2160
16th to endDay
11111223478%
2019
October1st to 15thDay
3212312345%68%
1800
16th to endDay
4212324345%65%
1768
November1st to 15thDay
7%324424346%57%
1654
16th to endDay
7%424423348%54%
1608
December1st to 15thDay
12%7%34425%35%7%43%
1440
16th to endDay
15%5%244245%5%7%42%
1536
January1st to 15thNight
10%425%42445%7%50%
2392
16th to endNight
12%5%24424446%47%
2496
February1st to 15thNight
11%5%244245%5%7%46%
2224
16th to endNight
12%6%2432445%8%45%
1895
March1st to 15thNight
8%5%25%5%35%45%8%45%
2043
16th to endNight
7%5%23425%35%10%49%
2061
April1st to 15thNight
9%424425%5%6%7%48%
1799
16th to endNight
321332336%8%62%
1800
May1st to 15thNight
1112323348%66%
1781
16th to endNight
211221335%8%66%
1498
June1st to 15thNight
121221435%7%68%
1440
16th to endNight
22486%
1440
July1st to 15thNight
111135%82%
1471
16th to endNight
1111235%80%
1701
August1st to 15thNight
112125%83%
1698
16th to endNight
112386%
1910
September1st to 15thNight
211221383%
1800
16th to endNight
11122235%78%
1938
October1st to 15thNight
4312213336%67%
2160
16th to endNight
4312222447%66%
2124
November1st to 15thNight
4223413346%61%
2204
16th to endNight
5%32422345%9%55%
2349
December1st to 15thNight
9%6%35%434347%46%
2520
16th to endNight
15%5%2332445%6%46%
2688

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
33%6%8%19%21%10%
1544
16th to endDay
37%6%8%12%20%13%
1728
February1st to 15thDay
35%6%8%18%22%9%
1625
16th to endDay
42%7%8%21%16%4
1579
March1st to 15thDay
34%7%13%19%17%7%
1914
16th to endDay
34%6%13%21%18%5%
2162
April1st to 15thDay
34%5%10%23%21%5%
2149
16th to endDay
22%5%10%27%24%9%
2160
May1st to 15thDay
15%48%25%35%11%
2166
16th to endDay
16%5%11%26%31%9%
2614
June1st to 15thDay
13%311%20%26%24%
2520
16th to endDay
5%1211%31%46%
2520
July1st to 15thDay
5%126%22%61%
2339
16th to endDay
7%139%22%55%
2313
August1st to 15thDay
6%39%26%52%
2246
16th to endDay
429%36%46%
2292
September1st to 15thDay
6%1412%31%43%
2160
16th to endDay
8%2419%41%23%
2019
October1st to 15thDay
16%36%21%25%26%
1800
16th to endDay
18%36%22%28%20%
1768
November1st to 15thDay
26%312%16%27%12%
1654
16th to endDay
26%7%9%19%27%10%
1608
December1st to 15thDay
37%7%9%15%19%9%
1440
16th to endDay
37%7%12%16%18%7%
1536
January1st to 15thNight
31%5%10%21%21%8%
2392
16th to endNight
35%5%11%12%20%15%
2496
February1st to 15thNight
33%5%9%20%22%8%
2235
16th to endNight
34%6%12%25%16%4
1895
March1st to 15thNight
33%8%12%18%17%9%
2043
16th to endNight
29%6%15%23%18%6%
2061
April1st to 15thNight
28%8%13%25%18%4
1799
16th to endNight
17%6%15%26%25%8%
1800
May1st to 15thNight
15%49%23%34%13%
1782
16th to endNight
13%6%11%26%34%7%
1498
June1st to 15thNight
13%410%17%27%25%
1440
16th to endNight
31312%33%46%
1440
July1st to 15thNight
5%127%21%61%
1389
16th to endNight
7%247%23%54%
1593
August1st to 15thNight
7%128%29%50%
1689
16th to endNight
5%38%34%47%
1910
September1st to 15thNight
8%1211%25%49%
1800
16th to endNight
9%15%18%38%26%
1938
October1st to 15thNight
18%36%20%25%24%
2160
16th to endNight
16%47%20%29%20%
2124
November1st to 15thNight
21%5%10%19%31%11%
2204
16th to endNight
24%5%11%18%27%12%
2349
December1st to 15thNight
36%5%8%18%22%9%
2520
16th to endNight
35%6%13%18%15%9%
2688

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
21%6%30%22%15%4
172
16th to endDay
16%10%23%23%19%6%
256
February1st to 15thDay
16%11%22%19%22%7%
245
16th to endDay
18%14%26%26%11%2
238
March1st to 15thDay
15%14%25%25%14%4
270
16th to endDay
13%13%33%27%9%2
288
April1st to 15thDay
17%19%28%22%10%1
269
16th to endDay
9%20%34%20%12%2
270
May1st to 15thDay
9%11%35%29%10%3
288
16th to endDay
6%12%24%34%16%6%
330
June1st to 15thDay
39%33%32%14%6%
315
16th to endDay
422%37%24%10%
315
July1st to 15thDay
114%36%34%13%
305
16th to endDay
112%39%30%14%
327
August1st to 15thDay
213%38%32%12%
315
16th to endDay
8%34%35%21%
332
September1st to 15thDay
2112%36%32%14%
315
16th to endDay
3414%37%30%10%
315
October1st to 15thDay
38%24%36%18%8%
315
16th to endDay
8%7%25%30%22%5%
276
November1st to 15thDay
6%6%16%20%35%15%
160
16th to endDay
10%12%19%36%19%2
88
December1st to 15thDay
26%11%23%23%13%1
60
16th to endDay
15%10%9%28%29%6%
64
January1st to 15thNight
12%210%34%29%11%
720
16th to endNight
14%112%33%26%11%
768
February1st to 15thNight
12%314%33%26%9%
704
16th to endNight
14%415%36%24%5%
632
March1st to 15thNight
8%5%15%36%26%7%
720
16th to endNight
9%418%34%27%5%
768
April1st to 15thNight
10%9%18%37%21%4
719
16th to endNight
36%21%31%27%8%
720
May1st to 15thNight
1317%40%27%9%
702
16th to endNight
2313%34%37%6%
377
June1st to 15thNight
2113%43%32%6%
360
16th to endNight
6%40%43%8%
360
July1st to 15thNight
124%57%15%
369
16th to endNight
115%58%23%
564
August1st to 15thNight
225%53%17%
616
16th to endNight
1323%56%15%
764
September1st to 15thNight
328%49%17%
720
16th to endNight
18%29%42%16%
716
October1st to 15thNight
6%39%35%31%13%
720
16th to endNight
6%29%29%31%20%
708
November1st to 15thNight
5%29%37%32%12%
700
16th to endNight
6%313%31%32%11%
720
December1st to 15thNight
11%213%39%24%7%
720
16th to endNight
15%6%15%33%23%4
768
Page generated at 2017-10-17 13:35:26. Version ac04

Copyright 2017 A. Danko


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