Camp Creek
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Camp Creek clear sky chart from 2005-11-05 to 2017-12-04.

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
41%
16009
18%
47847
12%
15970
47%
15970
22%
31789

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
18%
719
16%
2327
8%
716
28%
716
10%
1717
January16th to endNight
17%
768
16%
2496
6%
768
30%
768
13%
1738
February1st to 15thNight
18%
701
14%
2273
5%
701
29%
701
14%
1559
February16th to endNight
15%
631
15%
1887
6%
631
24%
631
12%
1393
March1st to 15thNight
24%
720
17%
1980
11%
720
30%
720
18%
1411
March16th to endNight
29%
768
14%
2112
9%
768
34%
768
20%
1501
April1st to 15thNight
31%
718
17%
1907
7%
718
39%
718
23%
1290
April16th to endNight
38%
585
19%
1665
10%
585
44%
585
24%
1103
May1st to 15thNight
40%
540
14%
1620
8%
540
45%
540
21%
1108
May16th to endNight
55%
561
15%
1684
10%
561
58%
561
26%
1091
June1st to 15thNight
65%
540
14%
1620
12%
540
67%
540
30%
1012
June16th to endNight
64%
540
16%
1620
14%
540
67%
540
31%
998
July1st to 15thNight
61%
510
11%
1530
10%
510
62%
510
27%
1013
July16th to endNight
73%
564
15%
1595
12%
531
76%
531
34%
945
August1st to 15thNight
66%
539
19%
1609
16%
536
66%
536
29%
1033
August16th to endNight
70%
636
21%
1782
19%
636
70%
636
33%
1107
September1st to 15thNight
62%
720
23%
1941
18%
720
64%
720
31%
1254
September16th to endNight
59%
717
23%
1980
20%
717
61%
717
31%
1264
October1st to 15thNight
51%
720
26%
2118
23%
720
57%
720
30%
1294
October16th to endNight
39%
768
26%
2304
19%
768
49%
768
26%
1427
November1st to 15thNight
47%
760
24%
2375
19%
760
56%
760
27%
1446
November16th to endNight
36%
780
24%
2535
18%
780
46%
780
23%
1551
December1st to 15thNight
25%
736
15%
2391
9%
736
33%
736
13%
1719
December16th to endNight
22%
768
17%
2496
7%
768
33%
768
12%
1815

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
13%7%37%6%35%5%5%7%32%
48633
Night
11%7%36%6%35%5%5%7%37%
48040
Cloud CoverDay
13%8%47%6%35%5%5%7%32%
48643
Night
11%7%37%6%35%5%5%7%37%
48044
TransparencyDay
48%5%11%20%12%1
48344
Night
44%5%12%21%13%2
47847
SeeingDay
18%10%20%22%18%9%
5824
Night
17%12%20%28%18%2
16015

By Month

Percentage Cloud Cover NE (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
14%9%412%9%44446%26%
1611
16th to endDay
13%12%6%8%5%33445%31%
1728
February1st to 15thDay
11%8%412%7%35%45%6%30%
1586
16th to endDay
13%10%6%11%6%35%346%27%
1586
March1st to 15thDay
15%8%5%6%5%24445%35%
1969
16th to endDay
17%10%37%6%33445%33%
2112
April1st to 15thDay
12%8%45%43435%6%40%
2041
16th to endDay
16%6%35%7%345%47%35%
2304
May1st to 15thDay
18%7%37%6%35%7%6%6%27%
2331
16th to endDay
13%5%36%6%5%6%6%6%7%31%
2431
June1st to 15thDay
10%425%7%48%7%6%9%32%
2340
16th to endDay
8%5%36%6%5%6%7%5%8%35%
2340
July1st to 15thDay
13%6%37%6%46%7%6%10%27%
2340
16th to endDay
9%5%37%7%5%8%7%7%9%27%
2465
August1st to 15thDay
13%6%47%9%47%6%7%8%24%
2340
16th to endDay
10%5%38%7%48%7%6%8%29%
2408
September1st to 15thDay
13%6%36%6%46%5%46%36%
2016
16th to endDay
17%7%36%5%45%45%7%33%
1980
October1st to 15thDay
16%6%26%42335%7%40%
1842
16th to endDay
15%10%36%423235%43%
1920
November1st to 15thDay
11%7%25%5%2445%7%43%
1809
16th to endDay
12%9%35%5%25%445%40%
1755
December1st to 15thDay
16%10%48%5%25%45%6%30%
1651
16th to endDay
16%13%5%7%6%35%45%5%27%
1728
January1st to 15thNight
13%7%413%10%45%345%26%
2327
16th to endNight
13%10%5%8%7%445%5%6%29%
2496
February1st to 15thNight
12%8%5%8%7%35%5%47%30%
2271
16th to endNight
10%9%6%11%8%36%5%5%5%27%
1887
March1st to 15thNight
15%9%45%6%45%445%35%
1968
16th to endNight
14%9%35%6%36%5%6%6%33%
2112
April1st to 15thNight
9%10%45%5%35%46%7%37%
1907
16th to endNight
10%7%26%6%36%45%8%38%
1665
May1st to 15thNight
14%7%37%6%2445%7%35%
1620
16th to endNight
8%5%36%7%35%5%5%8%39%
1682
June1st to 15thNight
8%3245%35%6%7%11%42%
1620
16th to endNight
6%425%5%35%5%7%11%41%
1620
July1st to 15thNight
8%5%35%6%35%6%6%10%37%
1620
16th to endNight
43246%46%6%7%11%41%
1703
August1st to 15thNight
8%6%26%5%347%6%7%41%
1620
16th to endNight
8%5%25%4245%8%9%42%
1782
September1st to 15thNight
8%5%25%6%35%446%47%
1941
16th to endNight
11%6%25%43445%7%44%
1980
October1st to 15thNight
12%6%245%33436%47%
2118
16th to endNight
11%7%35%5%25%345%44%
2304
November1st to 15thNight
11%7%25%434346%45%
2375
16th to endNight
10%9%35%5%24446%42%
2535
December1st to 15thNight
14%9%5%10%7%445%5%6%26%
2391
16th to endNight
13%10%5%8%7%45%45%5%27%
2496

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 15thDay
15%9%5%12%8%44446%26%
1611
16th to endDay
13%12%7%8%5%3344431%
1728
February1st to 15thDay
12%8%412%7%35%45%6%29%
1586
16th to endDay
13%11%6%11%6%35%346%27%
1586
March1st to 15thDay
15%9%47%6%24445%35%
1980
16th to endDay
17%10%46%5%24445%33%
2111
April1st to 15thDay
12%9%45%433446%40%
2041
16th to endDay
16%6%35%7%34446%35%
2304
May1st to 15thDay
18%7%36%5%46%6%7%6%26%
2331
16th to endDay
12%7%36%6%46%6%5%8%31%
2431
June1st to 15thDay
10%426%7%47%7%6%10%31%
2340
16th to endDay
9%5%37%6%46%7%6%8%34%
2340
July1st to 15thDay
13%6%37%6%47%6%7%9%27%
2340
16th to endDay
9%5%47%7%5%8%7%7%9%26%
2465
August1st to 15thDay
12%7%47%8%5%6%6%7%8%24%
2340
16th to endDay
9%6%38%6%47%7%6%9%29%
2408
September1st to 15thDay
13%7%36%6%46%5%46%36%
2016
16th to endDay
16%8%36%5%4445%7%32%
1980
October1st to 15thDay
15%7%25%5%2345%6%40%
1842
16th to endDay
15%10%26%423235%42%
1920
November1st to 15thDay
11%7%35%42345%7%42%
1809
16th to endDay
12%9%36%5%25%345%39%
1755
December1st to 15thDay
16%10%48%5%25%45%6%29%
1651
16th to endDay
16%13%5%9%6%24446%26%
1728
January1st to 15thNight
13%7%5%13%10%35%345%26%
2327
16th to endNight
14%10%5%8%7%45%5%46%28%
2496
February1st to 15thNight
11%9%6%9%8%345%46%30%
2264
16th to endNight
10%10%6%11%8%45%5%5%5%26%
1887
March1st to 15thNight
15%10%35%7%35%335%34%
1980
16th to endNight
14%8%45%6%47%5%5%5%32%
2112
April1st to 15thNight
10%10%45%5%35%46%8%36%
1907
16th to endNight
11%6%26%6%26%46%8%37%
1665
May1st to 15thNight
14%7%37%6%3445%7%35%
1619
16th to endNight
8%6%36%7%36%5%5%8%39%
1682
June1st to 15thNight
8%325%5%346%6%11%42%
1620
16th to endNight
6%5%25%5%35%5%7%10%41%
1620
July1st to 15thNight
8%5%26%5%347%6%9%37%
1620
16th to endNight
43246%46%7%7%11%41%
1703
August1st to 15thNight
8%6%26%5%35%6%6%8%40%
1620
16th to endNight
8%425%5%3448%9%42%
1782
September1st to 15thNight
7%6%35%6%35%446%46%
1941
16th to endNight
11%6%35%42445%7%44%
1980
October1st to 15thNight
12%5%245%24436%47%
2118
16th to endNight
11%8%36%42434445%
2304
November1st to 15thNight
11%7%24434446%45%
2375
16th to endNight
11%8%35%5%24446%42%
2535
December1st to 15thNight
14%9%5%10%7%45%5%46%26%
2391
16th to endNight
14%10%6%9%7%45%45%5%26%
2496

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
57%310%17%9%1
1612
16th to endDay
53%29%23%9%1
1728
February1st to 15thDay
53%48%21%11%
1588
16th to endDay
56%410%18%9%1
1586
March1st to 15thDay
47%410%22%12%2
1980
16th to endDay
51%410%22%10%1
2112
April1st to 15thDay
42%311%25%12%3
2041
16th to endDay
47%410%20%13%3
2304
May1st to 15thDay
52%6%13%16%9%1
2331
16th to endDay
48%6%15%20%8%1
2435
June1st to 15thDay
43%9%14%20%11%
2340
16th to endDay
43%8%15%16%14%2
2340
July1st to 15thDay
49%7%14%13%12%2
2201
16th to endDay
46%8%15%17%10%1
2310
August1st to 15thDay
51%7%14%17%8%
2327
16th to endDay
47%7%14%17%11%1
2408
September1st to 15thDay
47%6%9%19%15%2
2016
16th to endDay
49%5%8%21%15%
1980
October1st to 15thDay
43%310%23%16%3
1842
16th to endDay
44%18%24%16%2
1920
November1st to 15thDay
39%39%20%22%4
1809
16th to endDay
43%38%25%16%1
1755
December1st to 15thDay
52%310%18%13%2
1651
16th to endDay
56%311%18%9%1
1728
January1st to 15thNight
57%47%14%12%2
2327
16th to endNight
53%210%21%10%1
2496
February1st to 15thNight
50%212%20%11%1
2273
16th to endNight
56%410%19%7%1
1887
March1st to 15thNight
50%410%23%10%1
1980
16th to endNight
48%5%13%20%11%
2112
April1st to 15thNight
43%411%23%13%3
1907
16th to endNight
42%5%13%19%14%4
1665
May1st to 15thNight
47%5%14%21%11%
1620
16th to endNight
38%8%19%25%7%1
1684
June1st to 15thNight
33%9%21%20%14%
1620
16th to endNight
33%8%18%23%13%1
1620
July1st to 15thNight
37%10%16%17%13%3
1530
16th to endNight
29%9%21%23%13%1
1595
August1st to 15thNight
37%7%17%23%14%
1609
16th to endNight
33%7%17%26%13%1
1782
September1st to 15thNight
36%7%13%22%17%3
1941
16th to endNight
38%5%12%24%18%
1980
October1st to 15thNight
37%411%27%16%3
2118
16th to endNight
40%28%27%16%3
2304
November1st to 15thNight
38%39%20%22%5%
2375
16th to endNight
40%39%24%19%2
2535
December1st to 15thNight
55%410%17%10%2
2391
16th to endNight
56%410%17%9%1
2496

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
36%27%17%10%5%2
90
16th to endDay
41%20%21%13%2
96
February1st to 15thDay
30%31%32%6%
90
16th to endDay
32%21%33%10%2
87
March1st to 15thDay
25%17%23%24%9%
270
16th to endDay
21%20%27%18%9%1
288
April1st to 15thDay
20%17%23%22%13%2
270
16th to endDay
21%8%24%21%19%5%
270
May1st to 15thDay
28%13%25%15%11%6%
288
16th to endDay
15%6%21%20%19%16%
331
June1st to 15thDay
11%320%26%24%14%
315
16th to endDay
9%11%23%28%15%12%
315
July1st to 15thDay
16%224%25%16%14%
305
16th to endDay
8%310%26%29%21%
326
August1st to 15thDay
11%215%23%26%19%
313
16th to endDay
9%213%21%28%24%
332
September1st to 15thDay
13%6%10%24%29%15%
315
16th to endDay
18%5%12%25%26%11%
314
October1st to 15thDay
19%6%16%24%25%7%
315
16th to endDay
20%14%19%20%20%3
336
November1st to 15thDay
21%9%19%28%17%4
227
16th to endDay
20%20%22%28%7%1
135
December1st to 15thDay
32%16%25%17%9%1
100
16th to endDay
32%21%25%17%3
96
January1st to 15thNight
27%22%24%20%4
720
16th to endNight
26%23%28%19%1
768
February1st to 15thNight
27%20%28%22%
704
16th to endNight
23%23%33%18%1
631
March1st to 15thNight
24%15%30%25%4
720
16th to endNight
21%15%29%24%9%
768
April1st to 15thNight
19%18%26%28%7%
718
16th to endNight
15%12%23%32%14%1
585
May1st to 15thNight
17%10%22%32%15%1
540
16th to endNight
11%416%31%30%5%
563
June1st to 15thNight
9%212%37%33%5%
540
16th to endNight
7%214%39%31%4
540
July1st to 15thNight
8%214%36%34%3
510
16th to endNight
5%17%31%45%8%
564
August1st to 15thNight
10%18%36%38%3
539
16th to endNight
8%27%33%43%5%
636
September1st to 15thNight
10%310%30%39%5%
720
16th to endNight
15%311%34%31%3
717
October1st to 15thNight
15%8%17%30%24%4
720
16th to endNight
16%14%22%29%14%2
768
November1st to 15thNight
16%10%21%33%16%1
760
16th to endNight
19%16%22%28%12%
780
December1st to 15thNight
23%18%23%26%7%
736
16th to endNight
24%19%26%26%3
768
Page generated at 2017-12-05 10:18:59. Version ac04

Copyright 2017 A. Danko


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