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
40%
24266
17%
79821
12%
24167
47%
24167
20%
53289

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
17%
756
14%
4060
7%
737
27%
737
6%
2987
January11th to 20thNight
19%
758
21%
3985
8%
740
29%
740
7%
2617
January21st to endNight
17%
831
10%
4479
7%
814
30%
814
8%
3141
February1st to 10thNight
23%
760
16%
2470
9%
760
32%
760
17%
1675
February11th to 20thNight
13%
719
12%
2224
3%
719
22%
719
10%
1649
February21st to endNight
15%
592
18%
1768
6%
592
27%
592
13%
1292
March1st to 10thNight
22%
720
20%
1980
11%
720
31%
720
21%
1348
March11th to 20thNight
24%
720
14%
1980
6%
720
32%
720
17%
1446
March21st to endNight
28%
792
15%
2178
9%
792
34%
792
20%
1512
April1st to 10thNight
30%
720
16%
1967
7%
720
38%
720
22%
1332
April11th to 20thNight
36%
691
21%
1755
10%
691
43%
691
28%
1148
April21st to endNight
35%
540
20%
1620
10%
540
42%
540
22%
1075
May1st to 10thNight
39%
540
15%
1620
8%
540
44%
540
23%
1068
May11th to 20thNight
44%
531
13%
1592
8%
531
48%
531
21%
1096
May21st to endNight
59%
582
14%
1745
12%
582
61%
582
27%
1126
June1st to 10thNight
62%
540
15%
1620
14%
540
63%
540
29%
1026
June11th to 20thNight
59%
540
14%
1620
12%
540
62%
540
30%
1011
June21st to endNight
62%
540
18%
1620
15%
540
65%
540
30%
1009
July1st to 10thNight
65%
525
13%
1575
12%
525
66%
525
28%
1010
July11th to 20thNight
73%
522
14%
1566
13%
522
73%
522
34%
933
July21st to endNight
69%
591
17%
1672
13%
558
72%
558
29%
1041
August1st to 10thNight
64%
537
16%
1600
13%
534
65%
534
27%
1055
August11th to 20thNight
62%
534
19%
1598
16%
534
64%
534
28%
1035
August21st to endNight
69%
688
22%
1876
19%
688
69%
688
33%
1181
September1st to 10thNight
63%
720
22%
1921
17%
720
64%
720
31%
1249
September11th to 20thNight
61%
720
24%
1980
21%
720
62%
720
32%
1267
September21st to endNight
54%
720
21%
1980
17%
720
57%
720
27%
1307
October1st to 10thNight
51%
720
23%
2096
21%
720
56%
720
31%
1292
October11th to 20thNight
41%
720
22%
2160
17%
720
50%
720
26%
1362
October21st to endNight
40%
792
26%
2376
20%
792
49%
792
25%
1487
November1st to 10thNight
46%
740
26%
2264
20%
740
56%
740
30%
1363
November11th to 20thNight
37%
760
23%
2470
16%
760
47%
760
22%
1532
November21st to endNight
36%
760
23%
2470
17%
760
46%
760
22%
1540
December1st to 10thNight
22%
760
15%
2470
8%
760
31%
760
13%
1804
December11th to 20thNight
24%
759
18%
2984
10%
759
35%
759
12%
2084
December21st to endNight
24%
826
11%
4480
8%
817
34%
817
7%
3189

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
14%9%48%6%45%5%6%7%33%
78719
Night
12%9%47%6%45%5%5%7%36%
80374
TransparencyDay
48%5%11%21%12%2
78441
Night
46%5%12%22%13%2
80171
SeeingDay
22%13%23%22%14%7%
14111
Night
19%12%21%29%17%2
24293

By Month

Percentage Cloud Cover SE (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
15%12%6%15%6%33446%26%
2836
11th to 20thDay
14%12%8%15%8%6%443423%
2840
21st to endDay
15%17%8%8%5%24445%27%
3124
February1st to 10thDay
13%9%5%11%7%36%45%6%30%
1710
11th to 20thDay
16%10%5%10%7%45%46%6%27%
1715
21st to endDay
17%11%5%10%6%34446%30%
1488
March1st to 10thDay
14%10%47%5%3445%6%39%
1980
11th to 20thDay
19%10%5%7%6%345%5%6%30%
1980
21st to endDay
16%11%47%7%345%5%6%33%
2178
April1st to 10thDay
12%9%5%5%5%45%45%8%38%
1993
11th to 20thDay
13%9%36%6%4445%6%40%
2169
21st to endDay
18%7%35%6%35%5%5%6%36%
2340
May1st to 10thDay
16%7%37%6%46%7%8%7%30%
2340
11th to 20thDay
18%8%46%6%46%5%7%6%29%
2301
21st to endDay
13%7%36%6%5%7%7%6%10%31%
2531
June1st to 10thDay
12%436%7%46%6%6%9%35%
2340
11th to 20thDay
10%5%27%6%5%7%7%7%10%35%
2340
21st to endDay
10%6%36%6%46%7%7%8%37%
2340
July1st to 10thDay
11%6%37%7%47%6%7%9%33%
2340
11th to 20thDay
8%6%47%6%47%7%8%10%32%
2340
21st to endDay
11%6%47%7%5%7%7%7%9%30%
2547
August1st to 10thDay
10%7%37%8%5%7%6%8%10%28%
2327
11th to 20thDay
14%7%47%8%5%6%7%7%8%27%
2303
21st to endDay
9%5%37%6%47%7%7%9%34%
2462
September1st to 10thDay
11%6%36%6%46%5%5%7%41%
2034
11th to 20thDay
13%7%36%5%45%5%6%8%37%
1980
21st to endDay
19%8%36%5%35%45%7%34%
1980
October1st to 10thDay
15%7%26%6%2436%7%42%
1864
11th to 20thDay
16%8%35%5%345%46%42%
1800
21st to endDay
15%11%36%5%34436%41%
1980
November1st to 10thDay
10%7%35%43446%7%47%
1810
11th to 20thDay
12%9%47%5%35%448%39%
1710
21st to endDay
13%10%46%5%25%5%5%6%39%
1710
December1st to 10thDay
18%14%5%10%5%25%45%5%26%
1710
11th to 20thDay
15%12%5%9%5%25%45%7%31%
2153
21st to endDay
15%14%7%9%7%45%6%6%6%21%
3124
January1st to 10thNight
11%15%9%13%8%44445%23%
4109
11th to 20thNight
16%9%410%8%5%4445%29%
4120
21st to endNight
16%14%5%8%8%6%5%5%5%6%24%
4532
February1st to 10thNight
13%10%6%9%6%35%6%6%7%31%
2470
11th to 20thNight
18%10%5%10%8%45%5%45%27%
2222
21st to endNight
14%11%6%11%7%45%45%5%28%
1768
March1st to 10thNight
14%10%45%6%35%446%39%
1980
11th to 20thNight
17%10%46%6%46%5%5%6%31%
1980
21st to endNight
13%9%47%6%37%5%6%6%34%
2178
April1st to 10thNight
10%10%46%6%35%5%5%7%37%
1967
11th to 20thNight
11%8%35%5%35%47%7%42%
1755
21st to endNight
13%7%37%7%46%45%8%38%
1620
May1st to 10thNight
13%8%37%6%35%5%6%6%38%
1620
11th to 20thNight
13%9%48%7%35%46%8%33%
1592
21st to endNight
10%6%36%6%36%5%6%9%40%
1744
June1st to 10thNight
10%435%5%45%6%7%10%42%
1620
11th to 20thNight
8%5%26%6%35%5%6%10%43%
1620
21st to endNight
9%5%25%5%46%6%8%11%40%
1620
July1st to 10thNight
7%6%37%5%45%6%7%10%41%
1620
11th to 20thNight
8%425%6%35%6%7%10%44%
1620
21st to endNight
6%435%6%46%8%8%11%39%
1771
August1st to 10thNight
10%6%36%6%45%7%7%8%38%
1611
11th to 20thNight
11%7%36%6%45%6%6%7%40%
1598
21st to endNight
9%5%25%6%35%47%10%44%
1876
September1st to 10thNight
9%7%26%6%35%5%5%6%46%
1921
11th to 20thNight
12%6%35%434447%47%
1980
21st to endNight
12%9%36%42445%7%42%
1980
October1st to 10thNight
14%6%245%25%5%46%48%
2096
11th to 20thNight
12%9%45%5%35%446%44%
2160
21st to endNight
12%10%37%5%2445%5%43%
2376
November1st to 10thNight
10%8%35%5%34446%48%
2264
11th to 20thNight
11%9%46%5%35%5%5%6%41%
2470
21st to endNight
11%9%46%6%345%47%41%
2470
December1st to 10thNight
17%11%6%11%7%445%46%26%
2470
11th to 20thNight
13%9%6%12%7%45%45%6%29%
3042
21st to endNight
15%10%8%10%7%46%6%5%7%22%
4532

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
59%36%20%10%1
2837
11th to 20thDay
65%27%16%10%1
2840
21st to endDay
58%38%18%12%1
3124
February1st to 10thDay
52%5%8%21%13%1
1710
11th to 20thDay
56%48%19%10%2
1724
21st to endDay
55%48%16%13%4
1488
March1st to 10thDay
44%39%26%15%3
1980
11th to 20thDay
53%49%18%12%3
1980
21st to endDay
52%49%22%10%2
2178
April1st to 10thDay
43%411%24%14%4
1993
11th to 20thDay
44%410%23%16%4
2169
21st to endDay
48%5%12%22%11%2
2340
May1st to 10thDay
49%6%13%20%11%2
2340
11th to 20thDay
52%7%13%20%6%1
2305
21st to endDay
45%8%17%21%8%
2531
June1st to 10thDay
43%7%14%23%13%
2340
11th to 20thDay
41%10%15%19%14%1
2340
21st to endDay
40%8%15%21%13%2
2340
July1st to 10thDay
45%8%15%19%11%2
2275
11th to 20thDay
42%9%16%19%13%2
2271
21st to endDay
45%8%15%22%9%1
2405
August1st to 10thDay
46%8%18%20%7%
2314
11th to 20thDay
50%8%14%19%9%
2303
21st to endDay
42%8%17%19%12%2
2462
September1st to 10thDay
40%7%13%22%14%4
2034
11th to 20thDay
45%5%8%23%17%2
1980
21st to endDay
48%6%9%20%15%2
1980
October1st to 10thDay
41%411%24%16%4
1864
11th to 20thDay
43%310%23%19%2
1800
21st to endDay
45%38%25%15%4
1980
November1st to 10thDay
35%49%24%24%3
1810
11th to 20thDay
44%38%23%18%4
1710
21st to endDay
44%311%24%16%3
1710
December1st to 10thDay
59%39%17%10%1
1710
11th to 20thDay
50%310%18%18%1
2150
21st to endDay
60%49%21%6%1
3124
January1st to 10thNight
62%37%15%11%1
4109
11th to 20thNight
54%37%19%15%1
4120
21st to endNight
59%39%19%10%1
4532
February1st to 10thNight
50%314%19%13%1
2470
11th to 20thNight
59%38%17%11%3
2224
21st to endNight
56%410%17%9%4
1768
March1st to 10thNight
47%39%22%17%3
1980
11th to 20thNight
52%5%10%23%9%1
1980
21st to endNight
47%5%12%19%14%2
2178
April1st to 10thNight
44%5%12%23%14%3
1967
11th to 20thNight
39%412%22%18%5%
1755
21st to endNight
44%5%14%24%11%1
1620
May1st to 10thNight
44%5%16%21%12%1
1620
11th to 20thNight
47%7%16%23%7%1
1593
21st to endNight
38%8%20%26%7%1
1745
June1st to 10thNight
35%10%18%23%13%1
1620
11th to 20thNight
35%8%20%22%13%2
1620
21st to endNight
35%9%17%25%13%2
1620
July1st to 10thNight
35%11%18%19%14%3
1575
11th to 20thNight
30%9%22%22%14%3
1566
21st to endNight
32%11%17%28%11%
1672
August1st to 10thNight
40%8%19%23%10%
1600
11th to 20thNight
39%7%18%23%12%1
1598
21st to endNight
34%8%16%28%12%2
1876
September1st to 10thNight
37%8%15%22%15%4
1921
11th to 20thNight
37%6%10%26%20%1
1980
21st to endNight
42%5%11%26%15%1
1980
October1st to 10thNight
37%5%10%27%18%3
2096
11th to 20thNight
41%410%25%17%3
2160
21st to endNight
41%38%26%16%5%
2376
November1st to 10thNight
37%49%23%23%4
2264
11th to 20thNight
41%49%21%20%5%
2470
21st to endNight
43%310%24%17%4
2470
December1st to 10thNight
57%410%18%9%2
2470
11th to 20thNight
55%38%20%13%1
3044
21st to endNight
59%49%17%9%
4532

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
37%27%22%9%41
270
11th to 20thDay
39%21%30%9%1
270
21st to endDay
37%23%25%12%3
297
February1st to 10thDay
30%25%28%16%2
270
11th to 20thDay
47%23%22%8%
252
21st to endDay
41%22%29%7%1
206
March1st to 10thDay
29%22%25%18%6%
420
11th to 20thDay
32%23%22%18%41
420
21st to endDay
29%20%27%17%7%
462
April1st to 10thDay
27%20%25%17%10%1
420
11th to 20thDay
21%17%28%20%11%3
412
21st to endDay
29%14%27%16%11%2
420
May1st to 10thDay
26%15%28%16%9%5%
423
11th to 20thDay
21%9%30%20%14%6%
447
21st to endDay
16%7%21%26%18%13%
485
June1st to 10thDay
13%6%25%25%20%10%
450
11th to 20thDay
10%9%24%27%17%12%
450
21st to endDay
12%10%24%29%16%10%
450
July1st to 10thDay
13%419%25%22%17%
445
11th to 20thDay
7%318%33%24%15%
444
21st to endDay
12%5%19%25%26%14%
488
August1st to 10thDay
11%6%20%23%24%16%
446
11th to 20thDay
12%317%25%26%18%
439
21st to endDay
10%317%27%25%17%
495
September1st to 10thDay
11%416%27%27%14%
450
11th to 20thDay
14%412%28%30%12%
450
21st to endDay
24%8%17%29%17%5%
450
October1st to 10thDay
21%5%20%26%22%6%
450
11th to 20thDay
17%16%22%23%18%3
450
21st to endDay
24%13%26%20%14%3
495
November1st to 10thDay
19%12%27%25%13%4
408
11th to 20thDay
29%16%22%26%6%2
270
21st to endDay
25%19%30%21%41
270
December1st to 10thDay
37%19%25%14%4
270
11th to 20thDay
30%21%27%13%7%1
270
21st to endDay
28%21%27%16%6%2
297
January1st to 10thNight
26%24%26%20%3
760
11th to 20thNight
32%18%26%22%3
760
21st to endNight
26%23%29%20%2
836
February1st to 10thNight
27%18%28%25%2
760
11th to 20thNight
32%24%27%16%
722
21st to endNight
26%21%33%18%2
592
March1st to 10thNight
24%17%33%24%3
720
11th to 20thNight
27%18%27%22%7%
720
21st to endNight
21%15%31%25%7%
792
April1st to 10thNight
21%18%26%29%6%
720
11th to 20thNight
19%14%26%29%11%1
691
21st to endNight
17%14%24%35%9%1
540
May1st to 10thNight
17%10%25%33%14%1
540
11th to 20thNight
16%8%20%35%21%1
531
21st to endNight
13%313%34%32%5%
584
June1st to 10thNight
10%314%41%28%4
540
11th to 20thNight
10%316%34%34%5%
540
21st to endNight
8%315%41%30%3
540
July1st to 10thNight
9%211%35%39%4
525
11th to 20thNight
7%28%34%44%6%
522
21st to endNight
6%29%39%39%5%
591
August1st to 10thNight
11%18%36%39%5%
537
11th to 20thNight
13%29%33%40%4
534
21st to endNight
10%38%34%38%7%
688
September1st to 10thNight
12%49%31%39%6%
720
11th to 20thNight
14%310%33%35%4
720
21st to endNight
17%5%14%35%27%1
720
October1st to 10thNight
17%7%18%28%26%4
720
11th to 20thNight
17%12%23%31%16%2
720
21st to endNight
20%12%21%34%11%2
792
November1st to 10thNight
17%9%23%33%16%2
740
11th to 20thNight
20%14%23%30%12%1
760
21st to endNight
19%14%24%33%9%1
760
December1st to 10thNight
27%19%26%23%6%
760
11th to 20thNight
21%21%27%26%5%
760
21st to endNight
26%15%26%29%4
836
Page generated at 2024-02-12 06:35:33. Version ac07

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