Camp Creek
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Camp Creek clear sky chart from 2005-11-06 to 2024-02-15.

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
72%
24164
36%
79309
30%
24069
78%
24069
50%
37034

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
59%
751
36%
4002
27%
736
71%
736
31%
1684
January11th to 20thNight
60%
756
46%
3891
31%
740
72%
740
40%
1347
January21st to endNight
56%
828
23%
4297
29%
814
68%
814
24%
2301
February1st to 10thNight
61%
760
36%
2406
30%
760
73%
760
48%
1161
February11th to 20thNight
60%
718
34%
2152
28%
718
71%
718
45%
1133
February21st to endNight
58%
592
34%
1762
30%
592
66%
592
45%
923
March1st to 10thNight
61%
720
36%
1980
28%
720
69%
720
53%
1007
March11th to 20thNight
66%
720
38%
1980
30%
720
73%
720
56%
992
March21st to endNight
66%
792
37%
2178
27%
792
74%
792
56%
1061
April1st to 10thNight
72%
720
35%
1980
25%
720
78%
720
61%
938
April11th to 20thNight
65%
601
39%
1845
29%
601
76%
601
62%
787
April21st to endNight
72%
540
46%
1638
36%
540
81%
540
69%
671
May1st to 10thNight
76%
540
41%
1620
33%
540
82%
540
65%
692
May11th to 20thNight
79%
531
41%
1594
34%
531
83%
531
69%
657
May21st to endNight
80%
582
40%
1746
32%
582
84%
582
76%
687
June1st to 10thNight
84%
540
36%
1620
31%
540
86%
540
69%
669
June11th to 20thNight
88%
540
39%
1620
34%
540
90%
540
82%
612
June21st to endNight
85%
540
32%
1620
29%
540
87%
540
68%
680
July1st to 10thNight
87%
525
28%
1575
25%
525
87%
525
51%
771
July11th to 20thNight
86%
522
26%
1566
22%
522
86%
522
50%
783
July21st to endNight
79%
591
25%
1674
21%
558
79%
558
36%
975
August1st to 10thNight
87%
537
28%
1602
24%
534
88%
534
50%
808
August11th to 20thNight
85%
534
33%
1602
30%
534
85%
534
45%
854
August21st to endNight
85%
683
33%
1985
32%
683
85%
683
48%
1052
September1st to 10thNight
81%
720
33%
1980
31%
720
83%
720
51%
1056
September11th to 20thNight
86%
720
42%
1980
37%
720
88%
720
67%
916
September21st to endNight
80%
720
38%
1980
29%
720
85%
720
62%
939
October1st to 10thNight
74%
720
39%
2019
30%
720
80%
720
60%
963
October11th to 20thNight
75%
720
44%
2160
36%
720
82%
720
70%
889
October21st to endNight
74%
792
45%
2376
35%
792
83%
792
70%
975
November1st to 10thNight
74%
740
42%
2220
36%
740
81%
740
63%
981
November11th to 20thNight
72%
760
41%
2436
36%
760
81%
760
62%
1017
November21st to endNight
65%
760
39%
2470
34%
760
75%
760
48%
1160
December1st to 10thNight
64%
760
37%
2470
33%
760
73%
760
47%
1181
December11th to 20thNight
58%
759
33%
2938
31%
758
67%
758
32%
1592
December21st to endNight
56%
830
22%
4345
29%
817
65%
817
25%
2120

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
4313323446%66%
78818
Night
5%313323446%66%
80332
TransparencyDay
19%35%12%25%36%
78545
Night
20%25%12%25%36%
80127
SeeingDay
6%6%22%35%24%7%
13936
Night
5%215%41%32%4
24198

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
6%435%423335%61%
2858
11th to 20thDay
43135%34445%63%
2860
21st to endDay
12%6%2442445%6%51%
3146
February1st to 10thDay
5%5%13323437%64%
1771
11th to 20thDay
9%324324347%59%
1791
21st to endDay
7%425%323446%60%
1493
March1st to 10thDay
6%324324448%60%
1980
11th to 20thDay
5%42332345%7%63%
1980
21st to endDay
431333333468%
2178
April1st to 10thDay
322221336%7%69%
1980
11th to 20thDay
2212313245%74%
2063
21st to endDay
2112213245%76%
2317
May1st to 10thDay
1112212237%77%
2340
11th to 20thDay
1212213236%76%
2301
21st to endDay
211111122484%
2530
June1st to 10thDay
1111212235%81%
2340
11th to 20thDay
11111212387%
2340
21st to endDay
1112223245%77%
2340
July1st to 10thDay
22133245%6%7%65%
2340
11th to 20thDay
33145%36%6%8%11%50%
2340
21st to endDay
5%3246%37%7%8%11%44%
2545
August1st to 10thDay
4424325%5%6%8%58%
2328
11th to 20thDay
2314435%6%7%9%55%
2299
21st to endDay
32134345%6%8%61%
2365
September1st to 10thDay
431442445%6%63%
1980
11th to 20thDay
2212212235%78%
1980
21st to endDay
221222243475%
1980
October1st to 10thDay
3212323435%72%
1940
11th to 20thDay
21121123483%
1800
21st to endDay
1112313235%78%
1980
November1st to 10thDay
2212222346%74%
1859
11th to 20thDay
121332234474%
1739
21st to endDay
6%423313336%66%
1710
December1st to 10thDay
7%4235%33445%60%
1710
11th to 20thDay
7%5%36%5%335%7%6%50%
2169
21st to endDay
11%5%25%5%23445%53%
3146
January1st to 10thNight
5%5%24424446%60%
4097
11th to 20thNight
4313322335%71%
4110
21st to endNight
14%6%24423447%50%
4521
February1st to 10thNight
6%41332235%6%64%
2406
11th to 20thNight
8%424323436%61%
2151
21st to endNight
9%424323446%60%
1762
March1st to 10thNight
6%3133235%5%6%63%
1980
11th to 20thNight
7%312322336%68%
1980
21st to endNight
5%21322435%7%66%
2178
April1st to 10thNight
321332345%6%68%
1980
11th to 20thNight
2312213245%75%
1845
21st to endNight
211121233480%
1638
May1st to 10thNight
1112323347%73%
1620
11th to 20thNight
221221223480%
1594
21st to endNight
21111212485%
1746
June1st to 10thNight
1212213345%77%
1620
11th to 20thNight
111111212486%
1620
21st to endNight
1213223235%77%
1620
July1st to 10thNight
1213435%6%6%8%60%
1620
11th to 20thNight
22145%35%5%8%12%55%
1620
21st to endNight
4435%5%47%7%8%12%42%
1773
August1st to 10thNight
22134347%8%10%55%
1611
11th to 20thNight
23235%36%6%6%10%54%
1602
21st to endNight
23235%35%6%6%7%58%
1985
September1st to 10thNight
4314325%46%9%57%
1980
11th to 20thNight
2212223345%75%
1980
21st to endNight
2213323245%73%
1980
October1st to 10thNight
3213413335%72%
2019
11th to 20thNight
22211123382%
2160
21st to endNight
1111222335%79%
2376
November1st to 10thNight
4112222446%72%
2220
11th to 20thNight
2212222245%75%
2436
21st to endNight
6%323314345%66%
2470
December1st to 10thNight
7%313224347%63%
2470
11th to 20thNight
7%5%26%5%3445%7%52%
3041
21st to endNight
10%5%2443444454%
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
27%25%15%34%18%
2859
11th to 20thDay
24%2421%29%20%
2860
21st to endDay
33%4413%31%15%
3146
February1st to 10thDay
22%25%13%26%32%
1771
11th to 20thDay
26%3414%25%28%
1801
21st to endDay
24%3414%28%27%
1493
March1st to 10thDay
24%2311%27%32%
1980
11th to 20thDay
21%2412%29%32%
1980
21st to endDay
21%2410%35%28%
2178
April1st to 10thDay
15%1410%36%34%
1980
11th to 20thDay
13%139%27%47%
2066
21st to endDay
12%238%27%48%
2317
May1st to 10thDay
11%148%28%49%
2340
11th to 20thDay
12%139%24%51%
2304
21st to endDay
8%126%24%59%
2530
June1st to 10thDay
9%12424%59%
2340
11th to 20thDay
6%2212%78%
2340
21st to endDay
11%245%15%64%
2340
July1st to 10thDay
16%48%10%17%44%
2276
11th to 20thDay
23%8%14%21%21%14%
2271
21st to endDay
29%8%13%21%17%11%
2404
August1st to 10thDay
21%7%10%15%17%30%
2313
11th to 20thDay
21%7%10%19%22%20%
2299
21st to endDay
19%5%9%16%30%22%
2365
September1st to 10thDay
21%36%13%24%32%
1980
11th to 20thDay
12%248%29%46%
1980
21st to endDay
13%247%26%48%
1980
October1st to 10thDay
16%35%13%24%40%
1940
11th to 20thDay
8%236%25%56%
1800
21st to endDay
12%1410%26%47%
1980
November1st to 10thDay
13%1413%31%38%
1859
11th to 20thDay
14%1212%28%42%
1739
21st to endDay
23%1410%27%35%
1710
December1st to 10thDay
27%3414%21%31%
1710
11th to 20thDay
32%37%17%21%20%
2168
21st to endDay
33%25%19%25%16%
3146
January1st to 10thNight
26%25%15%33%19%
4097
11th to 20thNight
18%2421%37%19%
4110
21st to endNight
35%45%12%27%18%
4521
February1st to 10thNight
22%25%11%26%34%
2406
11th to 20thNight
25%35%14%24%29%
2152
21st to endNight
26%2410%27%31%
1762
March1st to 10thNight
21%25%12%25%36%
1980
11th to 20thNight
21%1311%26%38%
1980
21st to endNight
19%26%11%34%29%
2178
April1st to 10thNight
16%1410%29%39%
1980
11th to 20thNight
14%136%28%48%
1845
21st to endNight
11%138%24%53%
1638
May1st to 10thNight
13%15%8%25%48%
1620
11th to 20thNight
11%137%23%54%
1595
21st to endNight
8%125%22%62%
1746
June1st to 10thNight
11%13318%64%
1620
11th to 20thNight
6%12311%77%
1620
21st to endNight
12%14412%67%
1620
July1st to 10thNight
18%5%7%11%15%44%
1575
11th to 20thNight
19%6%14%18%25%18%
1566
21st to endNight
29%8%13%20%16%14%
1674
August1st to 10thNight
19%6%10%17%16%31%
1602
11th to 20thNight
23%6%12%18%17%24%
1602
21st to endNight
22%5%8%17%23%25%
1985
September1st to 10thNight
22%49%18%17%30%
1980
11th to 20thNight
13%249%25%47%
1980
21st to endNight
15%245%21%52%
1980
October1st to 10thNight
17%2411%22%44%
2019
11th to 20thNight
10%137%21%57%
2160
21st to endNight
10%149%23%53%
2376
November1st to 10thNight
15%1311%31%39%
2220
11th to 20thNight
14%1412%25%44%
2436
21st to endNight
22%249%28%36%
2470
December1st to 10thNight
22%2416%22%33%
2470
11th to 20thNight
33%25%13%25%22%
3041
21st to endNight
32%36%17%24%18%
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
16%329%37%13%2
270
11th to 20thDay
13%5%24%36%20%2
270
21st to endDay
11%7%26%35%17%5%
297
February1st to 10thDay
9%8%28%32%20%4
331
11th to 20thDay
13%11%32%29%15%
432
21st to endDay
13%12%36%27%10%1
346
March1st to 10thDay
7%14%35%31%11%2
420
11th to 20thDay
9%12%29%31%15%4
420
21st to endDay
7%16%37%28%11%2
462
April1st to 10thDay
6%10%33%32%15%4
420
11th to 20thDay
5%15%33%32%13%2
412
21st to endDay
415%34%26%17%4
420
May1st to 10thDay
311%29%36%19%3
423
11th to 20thDay
27%29%37%19%5%
448
21st to endDay
49%28%39%17%3
485
June1st to 10thDay
2421%41%25%6%
450
11th to 20thDay
3327%36%26%6%
450
21st to endDay
1118%44%28%7%
450
July1st to 10thDay
211%40%36%11%
446
11th to 20thDay
37%34%39%17%
444
21st to endDay
45%29%41%20%
487
August1st to 10thDay
46%35%37%18%
447
11th to 20thDay
37%35%41%14%
437
21st to endDay
15%34%42%17%
495
September1st to 10thDay
5%110%39%37%8%
450
11th to 20thDay
4213%44%30%7%
450
21st to endDay
45%18%37%30%7%
450
October1st to 10thDay
45%23%40%24%4
410
11th to 20thDay
35%20%38%28%7%
270
21st to endDay
26%20%38%26%8%
297
November1st to 10thDay
4321%43%24%4
270
11th to 20thDay
6%423%36%26%5%
270
21st to endDay
7%6%31%32%19%6%
270
December1st to 10thDay
7%6%23%40%21%3
270
11th to 20thDay
7%6%27%38%21%2
270
21st to endDay
19%6%28%31%14%2
297
January1st to 10thNight
9%224%43%19%3
760
11th to 20thNight
8%323%43%22%2
760
21st to endNight
12%322%43%17%2
836
February1st to 10thNight
9%422%41%21%3
760
11th to 20thNight
9%322%48%17%1
722
21st to endNight
11%422%43%18%2
592
March1st to 10thNight
7%423%47%18%1
720
11th to 20thNight
9%318%37%28%5%
720
21st to endNight
6%5%19%43%24%3
792
April1st to 10thNight
4316%53%21%2
720
11th to 20thNight
35%22%44%23%2
601
21st to endNight
2221%46%25%3
540
May1st to 10thNight
2414%50%28%2
540
11th to 20thNight
3213%49%30%3
531
21st to endNight
3113%46%32%4
584
June1st to 10thNight
219%46%40%2
540
11th to 20thNight
118%48%39%3
540
21st to endNight
37%38%49%4
540
July1st to 10thNight
2434%57%3
525
11th to 20thNight
31218%68%9%
522
21st to endNight
41419%60%11%
591
August1st to 10thNight
21221%63%11%
537
11th to 20thNight
21424%63%7%
534
21st to endNight
31325%60%9%
683
September1st to 10thNight
5%25%31%50%8%
720
11th to 20thNight
315%43%44%5%
720
21st to endNight
3210%43%35%7%
720
October1st to 10thNight
5%214%47%30%2
720
11th to 20thNight
3116%43%33%3
720
21st to endNight
2317%41%30%7%
792
November1st to 10thNight
4116%46%28%4
740
11th to 20thNight
3218%46%26%4
760
21st to endNight
8%319%43%25%2
760
December1st to 10thNight
9%319%43%24%1
760
11th to 20thNight
11%320%43%21%2
760
21st to endNight
12%222%43%19%2
836
Page generated at 2024-02-12 04:35:34. Version ac07

Copyright 2024 Attilla Danko


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