Camp Cedarwin Scout Camp
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Camp Cedarwin Scout Camp clear sky chart from 2005-11-05 to 2017-09-18.

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%
15550
15%
46863
11%
15512
45%
15512
20%
32725

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
19%
896
9%
2506
4%
895
24%
895
13%
1993
January16th to endNight
19%
774
9%
2502
4%
774
26%
774
10%
1974
February1st to 15thNight
23%
701
9%
2276
4%
701
29%
701
13%
1745
February16th to endNight
28%
631
14%
1893
6%
631
35%
631
15%
1403
March1st to 15thNight
32%
720
14%
2055
10%
720
36%
720
18%
1501
March16th to endNight
40%
768
17%
2112
11%
768
45%
768
24%
1475
April1st to 15thNight
36%
623
14%
1830
8%
623
42%
623
21%
1291
April16th to endNight
43%
540
20%
1620
9%
540
51%
540
26%
1051
May1st to 15thNight
44%
540
13%
1620
9%
540
48%
540
20%
1145
May16th to endNight
57%
562
16%
1684
13%
561
60%
561
28%
1064
June1st to 15thNight
60%
417
15%
1386
17%
417
63%
417
27%
850
June16th to endNight
62%
444
18%
1344
17%
444
66%
444
31%
819
July1st to 15thNight
66%
510
16%
1360
15%
510
68%
510
37%
842
July16th to endNight
72%
564
18%
1563
16%
531
74%
531
39%
877
August1st to 15thNight
72%
539
20%
1609
17%
536
73%
536
35%
942
August16th to endNight
68%
573
24%
1719
18%
573
72%
573
34%
1012
September1st to 15thNight
61%
690
22%
1944
17%
690
64%
690
32%
1210
September16th to endNight
59%
669
23%
1848
17%
669
63%
669
32%
1167
October1st to 15thNight
49%
660
18%
1912
17%
660
52%
660
26%
1258
October16th to endNight
29%
704
15%
2172
9%
704
38%
704
17%
1536
November1st to 15thNight
38%
700
19%
2276
17%
700
44%
700
23%
1489
November16th to endNight
26%
720
13%
2415
9%
720
31%
720
13%
1790
December1st to 15thNight
19%
720
7%
2520
3%
720
24%
720
8%
2034
December16th to endNight
17%
885
7%
2697
2%
885
21%
885
9%
2257

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%8%36%5%35%5%5%8%34%
47902
Night
15%8%36%5%3445%6%35%
47045
Cloud CoverDay
13%8%36%5%35%5%5%7%34%
47912
Night
15%8%36%5%3445%6%35%
47049
TransparencyDay
46%7%13%20%11%1
47602
Night
48%5%12%20%11%1
46863
SeeingDay
16%420%30%21%7%
5745
Night
19%6%25%30%15%2
15558

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
18%15%5%9%7%35%5%47%18%
1432
16th to endDay
17%15%7%10%7%35%45%6%16%
1719
February1st to 15thDay
16%12%7%8%7%45%445%22%
1586
16th to endDay
14%11%5%9%8%45%45%6%23%
1580
March1st to 15thDay
18%11%5%7%6%4435%6%26%
1894
16th to endDay
18%10%5%7%6%34446%29%
2112
April1st to 15thDay
17%9%46%5%25%5%5%7%30%
2127
16th to endDay
17%6%36%434447%38%
2340
May1st to 15thDay
16%8%26%6%45%46%6%32%
2331
16th to endDay
10%6%25%5%345%5%8%41%
2431
June1st to 15thDay
10%5%25%5%35%46%9%41%
2564
16th to endDay
9%5%25%5%36%6%7%11%36%
2610
July1st to 15thDay
8%424435%5%6%7%46%
2520
16th to endDay
8%424435%6%6%10%42%
2498
August1st to 15thDay
7%425%445%5%7%9%42%
2340
16th to endDay
9%424435%46%9%45%
2483
September1st to 15thDay
10%5%35%5%245%5%9%42%
2001
16th to endDay
13%5%2442445%8%42%
1837
October1st to 15thDay
13%6%26%5%35%45%7%40%
1716
16th to endDay
20%9%245%3446%6%32%
1699
November1st to 15thDay
13%7%36%325%447%40%
1582
16th to endDay
17%11%47%5%25%6%5%7%26%
1542
December1st to 15thDay
18%11%6%10%7%346%5%6%19%
1440
16th to endDay
20%14%6%10%6%44347%15%
1518
January1st to 15thNight
22%13%47%5%34445%24%
2506
16th to endNight
14%15%7%9%7%35%445%22%
2502
February1st to 15thNight
15%13%5%8%6%34445%26%
2274
16th to endNight
16%11%5%8%5%34445%28%
1893
March1st to 15thNight
18%9%45%6%3445%5%31%
2043
16th to endNight
14%7%36%5%35%46%6%36%
2112
April1st to 15thNight
17%8%45%43445%6%34%
1830
16th to endNight
14%6%25%5%345%6%7%39%
1620
May1st to 15thNight
18%6%26%6%35%46%7%33%
1620
16th to endNight
11%5%245%34448%43%
1682
June1st to 15thNight
10%424435%47%7%44%
1386
16th to endNight
8%424435%5%7%9%43%
1344
July1st to 15thNight
6%4245%235%47%52%
1440
16th to endNight
5%31342446%9%52%
1670
August1st to 15thNight
5%324435%6%6%9%48%
1620
16th to endNight
9%32432435%8%52%
1719
September1st to 15thNight
10%42442435%5%50%
1944
16th to endNight
12%42442445%6%48%
1848
October1st to 15thNight
15%5%245%335%46%42%
1912
16th to endNight
19%7%36%5%34445%35%
2172
November1st to 15thNight
13%6%25%4245%5%6%41%
2276
16th to endNight
23%9%35%5%2445%7%27%
2415
December1st to 15thNight
21%12%5%7%6%25%5%46%22%
2520
16th to endNight
22%14%6%8%7%35%445%17%
2697

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
18%14%49%7%45%45%6%18%
1432
16th to endDay
17%15%7%9%8%35%45%6%16%
1719
February1st to 15thDay
16%12%6%9%8%46%445%22%
1586
16th to endDay
14%11%410%8%45%45%6%23%
1580
March1st to 15thDay
18%11%5%7%6%34346%26%
1905
16th to endDay
17%10%5%7%6%34346%29%
2111
April1st to 15thDay
16%8%47%6%25%5%5%7%30%
2127
16th to endDay
16%6%36%43445%6%38%
2340
May1st to 15thDay
16%8%26%6%45%5%6%6%33%
2331
16th to endDay
10%6%245%445%5%8%41%
2431
June1st to 15thDay
9%6%25%6%35%5%5%9%41%
2564
16th to endDay
9%435%5%35%6%8%11%35%
2610
July1st to 15thDay
7%414436%5%6%7%46%
2520
16th to endDay
7%433435%6%6%10%43%
2498
August1st to 15thDay
6%426%5%45%6%7%9%42%
2340
16th to endDay
8%424435%46%9%44%
2483
September1st to 15thDay
10%5%35%5%2446%8%42%
2001
16th to endDay
13%5%25%43446%9%41%
1837
October1st to 15thDay
13%5%26%6%34447%40%
1716
16th to endDay
19%9%25%5%35%35%6%32%
1699
November1st to 15thDay
13%7%36%425%448%39%
1582
16th to endDay
17%11%47%5%25%5%5%7%26%
1542
December1st to 15thDay
18%11%7%10%7%25%6%46%18%
1440
16th to endDay
20%14%6%10%7%35%347%15%
1518
January1st to 15thNight
21%13%5%7%5%34445%24%
2506
16th to endNight
15%16%6%9%6%35%445%21%
2502
February1st to 15thNight
15%13%5%8%6%35%445%26%
2267
16th to endNight
16%11%6%7%6%34445%28%
1893
March1st to 15thNight
19%8%46%6%345%45%31%
2055
16th to endNight
14%7%36%5%35%46%6%36%
2112
April1st to 15thNight
17%8%45%43445%7%33%
1830
16th to endNight
14%5%35%4345%6%6%39%
1620
May1st to 15thNight
17%6%26%6%3446%7%33%
1619
16th to endNight
11%4345%345%48%43%
1682
June1st to 15thNight
10%425%435%5%6%8%43%
1386
16th to endNight
8%424435%5%7%9%43%
1344
July1st to 15thNight
7%4145%2346%7%51%
1440
16th to endNight
5%31342446%9%52%
1670
August1st to 15thNight
5%324436%5%6%9%48%
1620
16th to endNight
9%42432445%8%51%
1719
September1st to 15thNight
9%4245%2345%5%50%
1944
16th to endNight
12%5%2442445%6%47%
1848
October1st to 15thNight
15%5%245%335%5%6%42%
1912
16th to endNight
19%7%36%6%25%445%35%
2172
November1st to 15thNight
13%6%25%43445%6%41%
2276
16th to endNight
23%10%45%5%24447%27%
2415
December1st to 15thNight
20%12%5%7%6%35%446%21%
2520
16th to endNight
22%13%6%8%7%35%445%17%
2697

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
66%6%11%12%3
1433
16th to endDay
67%6%12%8%4
1719
February1st to 15thDay
62%6%9%15%6%
1588
16th to endDay
59%6%12%15%4
1580
March1st to 15thDay
57%7%11%16%5%1
1905
16th to endDay
53%6%10%20%7%
2112
April1st to 15thDay
50%6%12%17%12%
2127
16th to endDay
43%5%14%19%14%3
2340
May1st to 15thDay
47%6%11%20%11%2
2331
16th to endDay
37%8%13%26%12%1
2435
June1st to 15thDay
36%7%15%26%13%1
2564
16th to endDay
36%9%16%19%15%1
2610
July1st to 15thDay
32%7%12%25%19%2
2371
16th to endDay
32%8%15%24%15%2
2342
August1st to 15thDay
33%7%16%27%13%
2327
16th to endDay
31%8%16%26%15%2
2483
September1st to 15thDay
36%6%16%25%13%1
2001
16th to endDay
38%6%12%27%14%
1837
October1st to 15thDay
43%6%13%21%12%1
1716
16th to endDay
50%6%16%18%7%
1699
November1st to 15thDay
42%7%13%21%13%1
1582
16th to endDay
57%5%14%16%5%
1542
December1st to 15thDay
67%6%10%11%3
1440
16th to endDay
67%7%12%9%2
1518
January1st to 15thNight
62%5%10%14%6%
2506
16th to endNight
65%412%13%4
2502
February1st to 15thNight
60%6%10%16%5%
2276
16th to endNight
56%5%11%19%6%
1893
March1st to 15thNight
53%5%12%18%9%1
2055
16th to endNight
47%412%22%10%1
2112
April1st to 15thNight
50%411%18%13%
1830
16th to endNight
42%5%12%18%16%5%
1620
May1st to 15thNight
49%6%11%18%11%2
1620
16th to endNight
39%5%11%26%15%2
1684
June1st to 15thNight
37%7%12%26%15%
1386
16th to endNight
34%6%13%23%19%1
1344
July1st to 15thNight
31%7%10%26%21%2
1360
16th to endNight
26%6%17%26%19%3
1563
August1st to 15thNight
29%8%14%29%15%2
1609
16th to endNight
30%7%11%28%19%2
1719
September1st to 15thNight
34%6%12%25%18%2
1944
16th to endNight
36%5%12%26%17%1
1848
October1st to 15thNight
41%6%14%18%18%1
1912
16th to endNight
51%5%12%22%7%1
2172
November1st to 15thNight
43%5%13%20%14%1
2276
16th to endNight
58%412%18%5%
2415
December1st to 15thNight
66%5%10%11%5%
2520
16th to endNight
69%6%11%10%3
2697

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
22%8%40%17%10%1
90
16th to endDay
33%5%30%28%3
96
February1st to 15thDay
21%7%37%30%3
90
16th to endDay
18%12%27%33%8%
81
March1st to 15thDay
28%8%23%31%8%
195
16th to endDay
20%428%31%11%3
288
April1st to 15thDay
19%7%27%32%11%1
270
16th to endDay
20%228%25%15%6%
270
May1st to 15thDay
23%424%25%18%3
288
16th to endDay
13%322%27%25%7%
331
June1st to 15thDay
11%217%41%23%3
422
16th to endDay
13%320%34%22%5%
495
July1st to 15thDay
12%113%34%29%8%
475
16th to endDay
8%110%31%34%12%
358
August1st to 15thDay
8%18%35%30%15%
313
16th to endDay
10%212%25%33%15%
332
September1st to 15thDay
12%311%23%32%16%
315
16th to endDay
20%210%19%33%13%
262
October1st to 15thDay
13%321%28%22%9%
255
16th to endDay
22%8%33%26%9%
211
November1st to 15thDay
11%7%15%35%25%4
90
16th to endDay
18%22%20%32%6%
77
December1st to 15thDay
23%20%26%25%5%
60
16th to endDay
25%14%39%19%
81
January1st to 15thNight
27%10%34%21%6%
900
16th to endNight
20%10%35%26%6%
774
February1st to 15thNight
22%437%29%4
704
16th to endNight
21%7%31%32%6%
631
March1st to 15thNight
24%7%28%30%9%
720
16th to endNight
17%431%32%12%2
768
April1st to 15thNight
19%6%31%34%7%
623
16th to endNight
16%327%37%13%2
540
May1st to 15thNight
21%420%35%15%2
540
16th to endNight
14%217%36%25%4
563
June1st to 15thNight
11%117%43%24%
417
16th to endNight
11%217%38%27%3
444
July1st to 15thNight
10%112%40%29%5%
510
16th to endNight
6%112%42%30%6%
564
August1st to 15thNight
6%210%42%29%7%
539
16th to endNight
11%111%31%35%7%
573
September1st to 15thNight
12%414%29%30%8%
690
16th to endNight
16%314%28%30%7%
669
October1st to 15thNight
18%5%20%28%21%5%
660
16th to endNight
22%10%31%28%6%
704
November1st to 15thNight
16%9%30%27%14%1
700
16th to endNight
28%13%26%20%10%
720
December1st to 15thNight
27%13%33%18%6%
720
16th to endNight
28%8%35%23%4
885
Page generated at 2017-09-19 07:32:20. Version ac04

Copyright 2017 A. Danko


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