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Hole-in-the-Wall Campground
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Hole-in-the-Wall Campground clear sky chart from 2005-11-06 to 2024-01-16.

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
65%
24558
39%
74416
28%
24513
76%
24513
55%
33434

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
53%
758
34%
2457
24%
756
68%
756
43%
1177
January11th to 20thNight
53%
740
39%
2405
28%
740
70%
740
47%
1095
January21st to endNight
48%
792
40%
2475
25%
792
67%
792
41%
1204
February1st to 10thNight
52%
720
39%
2160
26%
720
68%
720
50%
1010
February11th to 20thNight
53%
700
39%
2099
27%
700
70%
700
50%
983
February21st to endNight
47%
592
38%
1776
28%
592
64%
592
49%
837
March1st to 10thNight
51%
720
32%
2160
22%
720
67%
720
44%
1062
March11th to 20thNight
54%
720
36%
1993
25%
720
66%
720
49%
988
March21st to endNight
48%
792
38%
2178
20%
792
65%
792
51%
1047
April1st to 10thNight
48%
720
37%
1823
16%
720
62%
720
53%
921
April11th to 20thNight
46%
711
40%
1779
16%
711
60%
711
56%
863
April21st to endNight
56%
622
43%
1702
20%
622
70%
622
64%
743
May1st to 10thNight
57%
540
41%
1620
22%
540
69%
540
59%
676
May11th to 20thNight
62%
531
43%
1595
25%
531
73%
531
67%
635
May21st to endNight
63%
582
39%
1746
24%
582
73%
582
69%
675
June1st to 10thNight
76%
540
36%
1620
28%
540
81%
540
72%
634
June11th to 20thNight
73%
540
38%
1620
30%
540
79%
540
72%
637
June21st to endNight
79%
540
37%
1620
30%
540
84%
540
73%
638
July1st to 10thNight
90%
525
36%
1575
30%
525
92%
525
73%
639
July11th to 20thNight
87%
522
32%
1566
28%
522
87%
522
57%
730
July21st to endNight
83%
591
34%
1674
28%
558
84%
558
48%
847
August1st to 10thNight
85%
562
38%
1627
28%
559
87%
559
63%
726
August11th to 20thNight
91%
712
40%
1780
26%
712
92%
712
73%
853
August21st to endNight
88%
792
43%
1980
31%
792
88%
792
72%
950
September1st to 10thNight
83%
720
40%
1885
31%
720
85%
720
66%
893
September11th to 20thNight
85%
720
47%
1980
39%
720
90%
720
79%
820
September21st to endNight
78%
720
46%
1980
35%
720
87%
720
75%
839
October1st to 10thNight
71%
720
44%
1980
32%
720
81%
720
65%
902
October11th to 20thNight
74%
720
50%
2011
38%
720
85%
720
73%
835
October21st to endNight
69%
792
44%
2474
35%
792
83%
792
65%
978
November1st to 10thNight
69%
740
41%
2405
35%
740
82%
740
62%
960
November11th to 20thNight
67%
760
42%
2470
37%
760
80%
760
60%
1007
November21st to endNight
58%
760
40%
2470
31%
760
73%
760
51%
1083
December1st to 10thNight
56%
760
38%
2470
29%
760
70%
760
46%
1157
December11th to 20thNight
55%
758
36%
2897
28%
758
67%
758
35%
1421
December21st to endNight
48%
824
23%
4364
24%
817
64%
817
25%
1969

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
3213323346%70%
74913
Night
2313323346%70%
74922
TransparencyDay
14%3314%27%39%
74640
Night
15%3314%28%38%
74717
SeeingDay
5%11%25%35%20%5%
14244
Night
47%19%34%30%7%
24580

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
4423223349%63%
1708
11th to 20thDay
5%323323346%67%
1665
21st to endDay
4423435%44463%
1878
February1st to 10thDay
5%313313345%68%
1800
11th to 20thDay
4413423446%65%
1750
21st to endDay
5%6%13323436%64%
1480
March1st to 10thDay
332432345%8%63%
1800
11th to 20thDay
4424323447%62%
1966
21st to endDay
221232435%8%67%
2178
April1st to 10thDay
3324323446%66%
2132
11th to 20thDay
1312223235%76%
2129
21st to endDay
2212322446%74%
2257
May1st to 10thDay
111221235%6%75%
2340
11th to 20thDay
1112212335%78%
2301
21st to endDay
2212323335%76%
2530
June1st to 10thDay
1112212225%81%
2340
11th to 20thDay
11121233483%
2340
21st to endDay
111221313382%
2340
July1st to 10thDay
2213223345%72%
2340
11th to 20thDay
331322345%7%68%
2340
21st to endDay
4424435%5%5%9%54%
2545
August1st to 10thDay
2312323336%72%
2299
11th to 20thDay
221232345%6%70%
2122
21st to endDay
3212223446%71%
2376
September1st to 10thDay
2211223446%72%
2073
11th to 20thDay
111121223483%
1980
21st to endDay
111221223482%
1980
October1st to 10thDay
2213322235%75%
1980
11th to 20thDay
211121233481%
1948
21st to endDay
1111212235%82%
1877
November1st to 10thDay
2212323345%74%
1674
11th to 20thDay
1313323335%72%
1710
21st to endDay
321222445%8%68%
1710
December1st to 10thDay
4425%4235%6%7%58%
1710
11th to 20thDay
5%425%43346%11%53%
2169
21st to endDay
6%5%24435%5%6%6%54%
3146
January1st to 10thNight
4324434447%61%
2457
11th to 20thNight
341332445%6%65%
2405
21st to endNight
5%413424346%63%
2475
February1st to 10thNight
3324322446%67%
2160
11th to 20thNight
332331345%6%66%
2098
21st to endNight
4413323446%66%
1776
March1st to 10thNight
23144246%6%7%60%
2160
11th to 20thNight
331333446%8%61%
1993
21st to endNight
221332435%6%68%
2178
April1st to 10thNight
2223413446%68%
1823
11th to 20thNight
1312322245%74%
1779
21st to endNight
111221225%7%76%
1702
May1st to 10thNight
1212212347%75%
1620
11th to 20thNight
1111113335%80%
1594
21st to endNight
1111212236%81%
1746
June1st to 10thNight
112212225%81%
1620
11th to 20thNight
111111222484%
1620
21st to endNight
11121223284%
1620
July1st to 10thNight
112213335%80%
1620
11th to 20thNight
3212325%45%7%66%
1620
21st to endNight
5%3243345%6%9%57%
1773
August1st to 10thNight
2212213346%73%
1636
11th to 20thNight
1111222347%76%
1780
21st to endNight
22221235%5%75%
1980
September1st to 10thNight
2212222335%75%
1885
11th to 20thNight
111121123385%
1980
21st to endNight
111121122484%
1980
October1st to 10thNight
321221233476%
1980
11th to 20thNight
11111222484%
2011
21st to endNight
1112213235%79%
2474
November1st to 10thNight
121221223478%
2405
11th to 20thNight
221222343475%
2470
21st to endNight
4312224446%68%
2470
December1st to 10thNight
432342345%7%62%
2470
11th to 20thNight
5%4245%3446%9%54%
3041
21st to endNight
45%25%5%25%5%6%7%52%
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
20%25%21%31%21%
1709
11th to 20thDay
19%3319%34%23%
1665
21st to endDay
21%35%17%33%20%
1878
February1st to 10thDay
19%2415%28%33%
1800
11th to 20thDay
19%3415%29%31%
1760
21st to endDay
21%2416%33%25%
1480
March1st to 10thDay
17%3318%30%29%
1800
11th to 20thDay
19%4316%33%25%
1966
21st to endDay
13%3422%37%21%
2178
April1st to 10thDay
18%3317%30%30%
2132
11th to 20thDay
12%2212%32%40%
2132
21st to endDay
11%2214%35%36%
2257
May1st to 10thDay
9%3215%32%39%
2340
11th to 20thDay
9%2210%32%45%
2304
21st to endDay
11%2110%32%43%
2530
June1st to 10thDay
8%218%23%58%
2340
11th to 20thDay
5%315%15%70%
2340
21st to endDay
9%21412%72%
2340
July1st to 10thDay
13%318%16%59%
2276
11th to 20thDay
15%3413%24%41%
2271
21st to endDay
22%5%6%18%19%29%
2404
August1st to 10thDay
14%439%24%48%
2284
11th to 20thDay
13%5%211%27%42%
2122
21st to endDay
14%3212%26%44%
2376
September1st to 10thDay
13%4310%21%49%
2073
11th to 20thDay
7%217%26%58%
1980
21st to endDay
9%219%26%54%
1980
October1st to 10thDay
14%2212%25%46%
1980
11th to 20thDay
9%228%26%52%
1948
21st to endDay
7%2211%29%49%
1877
November1st to 10thDay
12%3113%34%37%
1674
11th to 20thDay
14%2313%29%39%
1710
21st to endDay
14%3417%29%33%
1710
December1st to 10thDay
22%35%18%24%28%
1710
11th to 20thDay
25%48%22%25%16%
2168
21st to endDay
27%36%23%25%14%
3146
January1st to 10thNight
21%3419%31%22%
2457
11th to 20thNight
18%3417%31%26%
2405
21st to endNight
22%35%18%27%25%
2475
February1st to 10thNight
18%25%15%27%32%
2160
11th to 20thNight
17%3316%29%31%
2099
21st to endNight
18%2416%32%27%
1776
March1st to 10thNight
20%3418%31%24%
2160
11th to 20thNight
18%3417%32%26%
1993
21st to endNight
15%3420%35%23%
2178
April1st to 10thNight
17%2418%32%28%
1823
11th to 20thNight
13%2313%33%37%
1779
21st to endNight
9%2214%34%39%
1702
May1st to 10thNight
10%3314%34%37%
1620
11th to 20thNight
8%2213%31%44%
1595
21st to endNight
7%1213%37%40%
1746
June1st to 10thNight
7%219%24%57%
1620
11th to 20thNight
7%26%18%67%
1620
21st to endNight
8%1412%74%
1620
July1st to 10thNight
8%328%15%64%
1575
11th to 20thNight
15%4313%24%40%
1566
21st to endNight
21%5%6%18%21%29%
1674
August1st to 10thNight
13%3311%20%49%
1627
11th to 20thNight
9%4412%27%45%
1780
21st to endNight
10%3112%24%49%
1980
September1st to 10thNight
13%239%25%47%
1885
11th to 20thNight
6%218%24%58%
1980
21st to endNight
7%219%23%58%
1980
October1st to 10thNight
12%2212%27%46%
1980
11th to 20thNight
7%228%26%55%
2011
21st to endNight
9%2210%24%53%
2474
November1st to 10thNight
11%2212%36%38%
2405
11th to 20thNight
12%2213%29%42%
2470
21st to endNight
16%3214%28%37%
2470
December1st to 10thNight
20%3416%26%31%
2470
11th to 20thNight
25%35%18%27%22%
3041
21st to endNight
27%36%22%28%13%
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%16%26%31%14%1
270
11th to 20thDay
11%14%27%28%17%3
255
21st to endDay
9%14%32%28%14%3
360
February1st to 10thDay
8%14%34%30%13%3
420
11th to 20thDay
9%19%36%27%9%1
415
21st to endDay
11%21%33%26%9%1
346
March1st to 10thDay
10%19%33%28%9%
420
11th to 20thDay
9%19%31%27%13%1
420
21st to endDay
6%24%37%24%8%1
462
April1st to 10thDay
7%16%36%24%15%2
420
11th to 20thDay
6%22%36%24%10%2
412
21st to endDay
322%28%27%15%5%
420
May1st to 10thDay
416%31%30%15%4
423
11th to 20thDay
215%29%33%16%5%
448
21st to endDay
48%31%36%16%5%
485
June1st to 10thDay
37%24%38%23%5%
450
11th to 20thDay
16%24%38%24%7%
450
21st to endDay
26%22%43%22%6%
450
July1st to 10thDay
2112%45%30%10%
446
11th to 20thDay
3110%39%35%12%
444
21st to endDay
418%45%30%11%
487
August1st to 10thDay
2213%44%27%12%
447
11th to 20thDay
2110%48%27%12%
437
21st to endDay
313%41%32%11%
495
September1st to 10thDay
4317%39%31%6%
450
11th to 20thDay
1322%46%24%3
450
21st to endDay
28%19%40%26%5%
450
October1st to 10thDay
29%29%37%21%2
450
11th to 20thDay
39%21%40%22%5%
418
21st to endDay
310%24%30%28%5%
297
November1st to 10thDay
314%23%34%23%3
270
11th to 20thDay
411%26%33%20%6%
270
21st to endDay
6%11%24%34%20%4
270
December1st to 10thDay
6%8%31%36%16%3
270
11th to 20thDay
414%25%33%21%3
270
21st to endDay
11%19%27%27%13%2
297
January1st to 10thNight
7%9%23%34%21%7%
760
11th to 20thNight
6%10%26%34%20%5%
740
21st to endNight
9%10%26%32%18%4
792
February1st to 10thNight
6%8%27%33%22%4
720
11th to 20thNight
6%10%26%36%19%4
704
21st to endNight
7%12%30%32%15%5%
592
March1st to 10thNight
414%25%38%18%2
720
11th to 20thNight
6%13%21%30%23%8%
720
21st to endNight
413%29%32%19%3
792
April1st to 10thNight
413%28%31%20%3
720
11th to 20thNight
416%28%29%19%4
711
21st to endNight
214%26%31%22%6%
622
May1st to 10thNight
212%24%39%20%4
540
11th to 20thNight
111%24%29%31%4
531
21st to endNight
210%22%36%26%4
584
June1st to 10thNight
25%14%44%33%2
540
11th to 20thNight
1418%38%36%2
540
21st to endNight
2314%37%40%4
540
July1st to 10thNight
16%32%54%6%
525
11th to 20thNight
4433%52%7%
522
21st to endNight
415%26%59%5%
591
August1st to 10thNight
316%30%55%6%
562
11th to 20thNight
11425%58%12%
712
21st to endNight
3426%51%16%
792
September1st to 10thNight
325%27%50%13%
720
11th to 20thNight
119%39%38%12%
720
21st to endNight
2314%31%36%14%
720
October1st to 10thNight
35%17%42%29%5%
720
11th to 20thNight
26%14%39%31%8%
720
21st to endNight
37%17%33%28%12%
792
November1st to 10thNight
27%17%38%29%7%
740
11th to 20thNight
45%18%39%26%8%
760
21st to endNight
6%8%23%33%24%6%
760
December1st to 10thNight
6%8%23%38%21%5%
760
11th to 20thNight
9%7%21%36%23%4
760
21st to endNight
8%13%24%33%16%6%
836
Page generated at 2024-01-12 22:38:11. Version ac07

Copyright 2024 Attilla Danko


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