Cottonwood Pit Campground
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Cottonwood Pit Campground clear sky chart from 2005-11-06 to 2024-02-25.

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
49%
22827
17%
80605
16%
22741
53%
22741
22%
51328

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
30%
752
8%
4375
7%
736
34%
736
7%
3200
January11th to 20thNight
39%
756
10%
4412
13%
740
44%
740
9%
3221
January21st to endNight
42%
831
10%
4779
15%
814
47%
814
10%
3358
February1st to 10thNight
33%
760
12%
2470
8%
760
38%
760
15%
1792
February11th to 20thNight
38%
742
14%
2333
12%
740
42%
740
17%
1647
February21st to endNight
34%
610
15%
1829
12%
610
38%
610
15%
1352
March1st to 10thNight
37%
720
13%
2160
10%
720
42%
720
17%
1581
March11th to 20thNight
43%
720
13%
2044
11%
720
45%
720
19%
1476
March21st to endNight
35%
792
13%
2026
6%
792
39%
792
17%
1527
April1st to 10thNight
41%
720
14%
1800
6%
720
43%
720
22%
1306
April11th to 20thNight
39%
711
17%
1779
7%
711
43%
711
24%
1266
April21st to endNight
45%
648
15%
1728
8%
648
48%
648
26%
1177
May1st to 10thNight
49%
383
21%
1463
21%
383
54%
383
27%
800
May11th to 20thNight
54%
354
18%
1416
19%
354
61%
354
25%
787
May21st to endNight
52%
388
13%
1552
15%
388
57%
388
22%
915
June1st to 10thNight
54%
360
14%
1440
18%
360
60%
360
25%
817
June11th to 20thNight
51%
360
18%
1440
20%
360
63%
360
30%
732
June21st to endNight
65%
360
22%
1440
33%
360
71%
360
42%
621
July1st to 10thNight
69%
350
23%
1400
31%
350
79%
350
51%
546
July11th to 20thNight
68%
348
31%
1392
35%
348
82%
348
62%
471
July21st to endNight
71%
394
37%
1488
42%
372
82%
372
58%
536
August1st to 10thNight
70%
371
33%
1437
32%
369
80%
369
49%
577
August11th to 20thNight
79%
606
35%
1674
25%
606
82%
606
65%
772
August21st to endNight
69%
792
37%
1980
22%
792
73%
792
64%
990
September1st to 10thNight
74%
720
38%
1800
21%
720
77%
720
67%
878
September11th to 20thNight
69%
720
36%
1819
23%
720
73%
720
52%
1002
September21st to endNight
65%
720
30%
1980
25%
720
68%
720
43%
1100
October1st to 10thNight
59%
720
22%
2160
20%
720
64%
720
37%
1228
October11th to 20thNight
55%
720
25%
2160
24%
720
61%
720
34%
1254
October21st to endNight
50%
792
20%
2528
19%
792
54%
792
24%
1625
November1st to 10thNight
45%
740
18%
2405
18%
740
48%
740
19%
1672
November11th to 20thNight
40%
760
13%
2564
12%
760
43%
760
17%
1794
November21st to endNight
45%
760
14%
2660
13%
760
50%
760
19%
1757
December1st to 10thNight
41%
760
12%
2660
11%
760
45%
760
16%
1874
December11th to 20thNight
37%
760
11%
3204
10%
759
40%
759
11%
2354
December21st to endNight
28%
827
7%
4808
9%
817
31%
817
6%
3323

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
8%10%47%6%35%45%6%42%
78357
Night
7%10%47%6%45%5%5%7%40%
80968
TransparencyDay
43%49%20%16%7%
78060
Night
43%5%12%20%15%5%
80786
SeeingDay
14%15%27%25%14%4
13573
Night
12%11%20%33%21%3
22856

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
8%18%7%11%10%46%6%5%5%19%
2539
11th to 20thDay
9%20%8%10%7%44445%25%
2540
21st to endDay
12%18%6%10%9%5%5%45%6%22%
2862
February1st to 10thDay
8%14%8%10%7%35%5%5%8%27%
1710
11th to 20thDay
8%15%6%9%6%5%5%46%7%29%
1736
21st to endDay
6%15%7%11%8%5%7%6%6%6%24%
1521
March1st to 10thDay
8%17%9%12%8%45%5%5%5%24%
1800
11th to 20thDay
7%15%6%10%8%35%5%5%6%29%
1915
21st to endDay
10%18%7%12%8%46%5%45%21%
2330
April1st to 10thDay
11%16%6%8%8%45%5%5%5%27%
2160
11th to 20thDay
11%14%6%9%5%35%5%5%6%33%
2129
21st to endDay
9%14%47%6%35%347%37%
2230
May1st to 10thDay
8%10%36%5%45%5%5%6%43%
2494
11th to 20thDay
11%10%47%7%45%5%5%6%36%
2477
21st to endDay
14%12%47%7%35%5%5%6%33%
2723
June1st to 10thDay
15%10%36%5%25%5%5%7%37%
2520
11th to 20thDay
9%8%26%42446%8%47%
2520
21st to endDay
5%423324446%63%
2520
July1st to 10thDay
2213323445%70%
2520
11th to 20thDay
2222323345%74%
2520
21st to endDay
121231333478%
2741
August1st to 10thDay
231343445%7%65%
2490
11th to 20thDay
332312345%73%
2227
21st to endDay
3313223345%72%
2376
September1st to 10thDay
2213223335%73%
2160
11th to 20thDay
6%425%5%2435%5%59%
2140
21st to endDay
7%8%2442445%5%54%
1978
October1st to 10thDay
11%10%35%5%23436%48%
1800
11th to 20thDay
8%7%36%5%35%5%5%8%46%
1800
21st to endDay
10%10%5%8%5%45%446%41%
1828
November1st to 10thDay
11%14%48%6%45%45%7%32%
1674
11th to 20thDay
9%14%48%9%5%6%5%6%7%28%
1615
21st to endDay
6%14%6%8%7%46%5%5%6%33%
1520
December1st to 10thDay
6%14%7%10%7%35%5%5%7%30%
1520
11th to 20thDay
9%16%7%9%7%45%5%7%8%24%
1928
21st to endDay
9%14%6%10%9%5%7%6%6%6%21%
2794
January1st to 10thNight
7%15%7%11%9%5%7%6%5%6%21%
4406
11th to 20thNight
11%18%7%9%8%45%5%5%6%22%
4420
21st to endNight
10%16%5%9%7%46%6%6%8%24%
4795
February1st to 10thNight
8%13%5%10%7%46%5%6%6%29%
2470
11th to 20thNight
8%11%6%10%7%45%5%5%7%32%
2331
21st to endNight
7%13%8%9%7%46%6%6%7%26%
1829
March1st to 10thNight
7%12%5%10%7%5%6%6%6%7%28%
2160
11th to 20thNight
7%10%48%9%5%5%8%6%8%29%
2044
21st to endNight
7%12%5%10%7%36%6%8%8%27%
2026
April1st to 10thNight
10%13%48%7%35%45%6%34%
1800
11th to 20thNight
8%12%5%8%6%36%5%45%38%
1779
21st to endNight
7%10%46%5%35%5%6%8%40%
1728
May1st to 10thNight
5%9%36%5%35%46%8%48%
1463
11th to 20thNight
8%7%36%5%345%5%8%45%
1416
21st to endNight
9%10%445%45%45%8%43%
1552
June1st to 10thNight
11%7%245%335%5%7%47%
1440
11th to 20thNight
7%5%25%5%23446%55%
1440
21st to endNight
4313424345%66%
1440
July1st to 10thNight
121332445%6%71%
1440
11th to 20thNight
211212245%80%
1440
21st to endNight
221221233379%
1576
August1st to 10thNight
3312224447%67%
1445
11th to 20thNight
2212223335%76%
1674
21st to endNight
221322333475%
1980
September1st to 10thNight
2212222445%75%
1800
11th to 20thNight
3423424445%64%
1819
21st to endNight
5%5%25%42345%6%59%
1980
October1st to 10thNight
8%7%25%42445%6%53%
2160
11th to 20thNight
8%7%35%43435%6%52%
2160
21st to endNight
7%9%38%7%45%5%46%42%
2528
November1st to 10thNight
12%11%47%6%35%6%5%6%34%
2405
11th to 20thNight
10%10%47%8%46%5%6%6%31%
2564
21st to endNight
6%12%48%7%46%45%7%36%
2660
December1st to 10thNight
7%13%6%9%8%5%5%5%5%8%31%
2660
11th to 20thNight
7%13%6%11%9%5%6%5%6%8%24%
3276
21st to endNight
7%12%5%8%9%5%7%7%6%7%26%
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
65%6%12%14%3
2539
11th to 20thDay
64%311%15%5%2
2540
21st to endDay
64%5%11%15%42
2862
February1st to 10thDay
55%5%15%18%6%1
1710
11th to 20thDay
54%5%12%17%9%3
1745
21st to endDay
59%7%12%15%6%2
1521
March1st to 10thDay
62%412%15%6%1
1800
11th to 20thDay
55%411%21%9%
1915
21st to endDay
65%5%11%14%5%
2330
April1st to 10thDay
59%411%15%9%2
2160
11th to 20thDay
52%411%19%11%3
2132
21st to endDay
48%5%9%24%13%2
2230
May1st to 10thDay
40%5%10%28%15%1
2494
11th to 20thDay
48%5%9%23%13%2
2480
21st to endDay
51%5%11%21%11%1
2724
June1st to 10thDay
45%5%9%30%10%
2520
11th to 20thDay
35%410%29%18%4
2520
21st to endDay
22%310%26%29%10%
2520
July1st to 10thDay
16%46%20%28%26%
2451
11th to 20thDay
14%45%12%32%33%
2445
21st to endDay
12%3211%41%31%
2589
August1st to 10thDay
18%4422%33%18%
2473
11th to 20thDay
14%2424%34%21%
2227
21st to endDay
15%3423%37%17%
2376
September1st to 10thDay
15%2425%31%22%
2160
11th to 20thDay
27%5%6%22%26%14%
2140
21st to endDay
32%49%23%23%9%
1978
October1st to 10thDay
39%5%9%20%20%8%
1800
11th to 20thDay
38%5%9%25%19%4
1800
21st to endDay
45%411%21%18%2
1828
November1st to 10thDay
52%412%20%11%1
1674
11th to 20thDay
56%6%11%18%8%
1615
21st to endDay
52%5%11%14%15%3
1520
December1st to 10thDay
52%9%12%16%9%2
1520
11th to 20thDay
59%415%15%7%1
1928
21st to endDay
63%6%12%14%5%
2794
January1st to 10thNight
61%5%15%14%4
4406
11th to 20thNight
63%313%13%6%3
4420
21st to endNight
59%417%13%6%1
4795
February1st to 10thNight
55%6%15%16%8%1
2470
11th to 20thNight
51%6%13%18%9%3
2333
21st to endNight
54%7%11%18%9%2
1829
March1st to 10thNight
53%7%12%19%7%2
2160
11th to 20thNight
49%7%15%21%6%1
2044
21st to endNight
51%9%14%20%6%
2026
April1st to 10thNight
50%5%13%22%8%2
1800
11th to 20thNight
46%6%12%24%10%2
1779
21st to endNight
41%8%15%22%12%2
1728
May1st to 10thNight
34%413%33%16%
1463
11th to 20thNight
36%5%17%29%11%2
1416
21st to endNight
40%5%18%26%10%1
1552
June1st to 10thNight
36%6%13%32%12%1
1440
11th to 20thNight
31%413%34%16%3
1440
21st to endNight
21%311%30%26%9%
1440
July1st to 10thNight
14%410%25%26%21%
1400
11th to 20thNight
9%39%18%32%28%
1392
21st to endNight
12%3116%43%25%
1488
August1st to 10thNight
17%37%27%33%14%
1437
11th to 20thNight
13%36%26%33%20%
1674
21st to endNight
14%35%26%36%17%
1980
September1st to 10thNight
12%35%27%34%19%
1800
11th to 20thNight
21%5%7%24%29%14%
1819
21st to endNight
27%49%25%23%13%
1980
October1st to 10thNight
31%411%23%24%7%
2160
11th to 20thNight
34%313%23%22%6%
2160
21st to endNight
43%5%11%17%19%4
2528
November1st to 10thNight
50%6%10%17%15%2
2405
11th to 20thNight
51%6%13%19%10%1
2564
21st to endNight
47%5%12%16%17%3
2660
December1st to 10thNight
52%6%13%17%10%2
2660
11th to 20thNight
59%413%16%8%
3276
21st to endNight
57%6%12%15%9%1
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
27%20%26%14%11%2
180
11th to 20thDay
21%23%24%18%10%4
180
21st to endDay
16%18%32%22%10%2
240
February1st to 10thDay
19%24%32%19%6%1
370
11th to 20thDay
22%24%29%17%7%1
398
21st to endDay
19%22%30%21%7%
363
March1st to 10thDay
22%22%31%19%5%
420
11th to 20thDay
21%20%30%20%8%1
420
21st to endDay
23%21%29%21%6%1
462
April1st to 10thDay
25%21%25%20%7%3
420
11th to 20thDay
21%26%26%16%7%4
412
21st to endDay
16%20%30%21%10%2
420
May1st to 10thDay
15%20%29%21%12%4
423
11th to 20thDay
24%15%22%24%12%4
448
21st to endDay
18%13%23%26%16%5%
485
June1st to 10thDay
17%15%22%23%17%6%
450
11th to 20thDay
14%20%28%23%12%2
450
21st to endDay
49%32%32%18%6%
450
July1st to 10thDay
47%31%36%19%4
446
11th to 20thDay
39%30%32%20%5%
444
21st to endDay
27%28%35%21%7%
487
August1st to 10thDay
36%27%35%20%9%
447
11th to 20thDay
45%19%34%25%12%
437
21st to endDay
6%9%23%35%19%8%
495
September1st to 10thDay
5%6%28%31%22%8%
450
11th to 20thDay
9%10%21%32%22%6%
450
21st to endDay
13%12%24%26%20%4
450
October1st to 10thDay
16%14%20%27%16%6%
450
11th to 20thDay
15%15%20%28%15%8%
450
21st to endDay
17%15%29%20%14%5%
343
November1st to 10thDay
19%16%26%24%15%
270
11th to 20thDay
20%15%25%24%14%3
225
21st to endDay
17%18%26%25%12%2
180
December1st to 10thDay
16%19%28%19%11%7%
180
11th to 20thDay
25%16%33%18%7%1
180
21st to endDay
18%21%29%23%7%2
198
January1st to 10thNight
16%18%24%24%17%2
760
11th to 20thNight
19%16%18%24%19%4
760
21st to endNight
17%11%19%33%19%2
836
February1st to 10thNight
16%16%23%30%14%2
760
11th to 20thNight
16%14%22%30%17%2
744
21st to endNight
14%17%24%32%11%1
610
March1st to 10thNight
14%17%23%30%15%2
720
11th to 20thNight
13%15%21%32%18%2
720
21st to endNight
15%17%22%30%15%1
792
April1st to 10thNight
18%15%18%29%17%3
720
11th to 20thNight
13%14%26%27%17%3
711
21st to endNight
13%12%24%34%16%2
648
May1st to 10thNight
8%10%26%36%17%2
383
11th to 20thNight
12%8%18%30%28%4
354
21st to endNight
13%7%21%33%23%3
389
June1st to 10thNight
14%7%18%37%22%1
360
11th to 20thNight
10%8%25%38%18%1
360
21st to endNight
6%5%19%44%24%2
360
July1st to 10thNight
1422%45%26%2
350
11th to 20thNight
2325%46%22%1
348
21st to endNight
2320%43%30%2
394
August1st to 10thNight
4119%42%32%2
371
11th to 20thNight
3212%36%39%8%
606
21st to endNight
3419%39%32%2
792
September1st to 10thNight
3317%39%34%4
720
11th to 20thNight
5%417%35%29%9%
720
21st to endNight
8%7%14%34%32%6%
720
October1st to 10thNight
11%5%18%35%25%5%
720
11th to 20thNight
12%8%17%33%23%7%
720
21st to endNight
13%12%17%33%19%6%
792
November1st to 10thNight
18%12%18%34%17%1
740
11th to 20thNight
17%16%20%29%17%2
760
21st to endNight
14%14%19%29%18%5%
760
December1st to 10thNight
18%11%20%31%18%3
760
11th to 20thNight
16%14%20%31%17%1
760
21st to endNight
22%18%22%25%11%1
836
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