Camp No'Chimik
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Camp No'Chimik clear sky chart from 2005-11-05 to 2017-10-06.

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
29%
14742
14%
47066
8%
14712
36%
14712
17%
33205

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
15%
720
7%
2506
3%
716
21%
716
7%
2009
January16th to endNight
21%
768
11%
2640
6%
768
27%
768
11%
1960
February1st to 15thNight
16%
702
10%
2287
4%
701
24%
701
10%
1750
February16th to endNight
22%
631
13%
1943
7%
631
31%
631
14%
1444
March1st to 15thNight
20%
720
14%
2103
7%
720
28%
720
15%
1556
March16th to endNight
32%
768
20%
2031
9%
768
39%
768
22%
1405
April1st to 15thNight
25%
718
16%
1796
5%
718
30%
718
20%
1309
April16th to endNight
30%
654
18%
1734
8%
654
36%
654
22%
1206
May1st to 15thNight
32%
360
17%
1440
14%
360
42%
360
16%
937
May16th to endNight
35%
375
13%
1497
10%
374
46%
374
19%
930
June1st to 15thNight
33%
360
9%
1440
8%
360
42%
360
15%
965
June16th to endNight
39%
360
9%
1440
12%
360
44%
360
18%
918
July1st to 15thNight
52%
340
15%
1360
22%
340
58%
340
28%
735
July16th to endNight
53%
376
14%
1418
17%
354
57%
354
26%
802
August1st to 15thNight
49%
442
15%
1513
12%
440
54%
440
25%
929
August16th to endNight
50%
715
21%
1861
9%
715
56%
715
38%
1139
September1st to 15thNight
45%
720
16%
1800
7%
720
49%
720
31%
1223
September16th to endNight
49%
717
24%
1955
16%
717
53%
717
33%
1231
October1st to 15thNight
35%
684
18%
2051
12%
684
44%
684
22%
1397
October16th to endNight
23%
704
11%
2201
5%
704
30%
704
13%
1663
November1st to 15thNight
26%
700
17%
2322
12%
700
34%
700
17%
1611
November16th to endNight
18%
720
11%
2520
6%
720
25%
720
10%
1915
December1st to 15thNight
18%
720
7%
2520
3%
720
23%
720
8%
2011
December16th to endNight
13%
768
9%
2688
4%
768
20%
768
7%
2160

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
18%8%36%5%34446%32%
48138
Night
18%10%36%5%34446%33%
47235
Cloud CoverDay
18%8%36%5%34446%33%
48147
Night
18%9%36%5%34446%33%
47241
TransparencyDay
51%411%20%10%1
47825
Night
52%411%20%10%1
47066
SeeingDay
21%12%29%21%11%4
5566
Night
23%11%28%25%10%
14744

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
21%15%5%9%6%2434420%
1432
16th to endDay
14%14%5%8%7%35%5%5%5%23%
1582
February1st to 15thDay
14%13%5%10%8%45%446%22%
1575
16th to endDay
18%13%47%7%34445%26%
1529
March1st to 15thDay
18%11%48%7%35%435%27%
1845
16th to endDay
17%8%45%323445%40%
2193
April1st to 15thDay
24%9%35%5%23245%33%
2152
16th to endDay
20%8%25%423346%37%
2238
May1st to 15thDay
20%8%25%5%34446%33%
2511
16th to endDay
17%6%35%6%245%5%6%35%
2618
June1st to 15thDay
22%6%35%435%5%5%7%30%
2520
16th to endDay
17%6%36%5%35%5%5%7%32%
2520
July1st to 15thDay
13%425%5%25%5%6%8%39%
2520
16th to endDay
11%5%35%6%35%6%6%9%36%
2654
August1st to 15thDay
12%7%26%5%46%5%6%7%36%
2436
16th to endDay
11%425%435%46%8%42%
2327
September1st to 15thDay
17%5%15%423348%41%
2160
16th to endDay
14%425%323446%46%
2001
October1st to 15thDay
19%8%35%5%345%45%34%
1707
16th to endDay
26%11%37%6%35%33424%
1669
November1st to 15thDay
16%9%35%6%46%447%32%
1533
16th to endDay
22%14%47%5%34445%24%
1440
December1st to 15thDay
23%14%49%6%45%44417%
1440
16th to endDay
24%15%5%7%6%3442321%
1536
January1st to 15thNight
18%16%6%10%7%4444419%
2506
16th to endNight
14%16%5%8%6%44345%26%
2640
February1st to 15thNight
14%14%5%11%7%44445%22%
2285
16th to endNight
17%13%47%6%34445%28%
1943
March1st to 15thNight
20%12%46%5%23345%30%
2090
16th to endNight
17%7%45%5%3324342%
2031
April1st to 15thNight
23%9%34433245%35%
1796
16th to endNight
19%7%25%424346%37%
1734
May1st to 15thNight
22%7%244245%35%36%
1440
16th to endNight
17%7%2442445%7%38%
1495
June1st to 15thNight
19%7%35%5%345%48%31%
1440
16th to endNight
16%6%25%5%345%5%7%36%
1440
July1st to 15thNight
10%3235%25%45%9%46%
1440
16th to endNight
9%4344246%5%8%46%
1514
August1st to 15thNight
10%5%36%5%2446%9%41%
1523
16th to endNight
9%42432445%7%49%
1861
September1st to 15thNight
16%5%26%434346%43%
1800
16th to endNight
15%424323335%50%
1955
October1st to 15thNight
18%8%35%5%2245%6%37%
2051
16th to endNight
26%9%37%5%33436%26%
2201
November1st to 15thNight
21%8%45%5%25%335%33%
2322
16th to endNight
22%12%48%6%34335%25%
2520
December1st to 15thNight
22%15%46%6%35%44420%
2520
16th to endNight
24%15%5%8%7%2333419%
2688

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
22%16%6%8%6%3433420%
1432
16th to endDay
14%14%5%8%8%35%45%5%23%
1582
February1st to 15thDay
15%13%5%10%8%45%446%22%
1575
16th to endDay
18%13%5%7%7%25%435%25%
1529
March1st to 15thDay
18%10%38%6%35%43430%
1855
16th to endDay
16%7%35%323335%42%
2192
April1st to 15thDay
24%9%35%5%23345%33%
2152
16th to endDay
20%8%26%423346%37%
2238
May1st to 15thDay
20%8%35%5%25%446%33%
2511
16th to endDay
17%6%36%5%345%5%7%35%
2618
June1st to 15thDay
21%7%35%5%35%45%7%30%
2520
16th to endDay
18%6%35%5%35%5%5%8%32%
2520
July1st to 15thDay
13%5%25%435%5%6%8%39%
2520
16th to endDay
11%5%25%5%35%6%7%9%35%
2654
August1st to 15thDay
11%6%26%6%45%5%5%6%39%
2436
16th to endDay
10%425%435%45%8%45%
2327
September1st to 15thDay
17%5%25%42345%6%41%
2160
16th to endDay
15%425%32435%6%46%
2001
October1st to 15thDay
20%7%25%5%35%445%34%
1707
16th to endDay
26%10%37%6%3443424%
1669
November1st to 15thDay
16%9%36%6%36%447%32%
1533
16th to endDay
22%13%47%5%34346%24%
1440
December1st to 15thDay
23%14%5%8%7%45%34417%
1440
16th to endDay
24%15%5%8%5%3443320%
1536
January1st to 15thNight
19%15%6%10%7%35%44418%
2506
16th to endNight
13%17%5%8%6%44445%26%
2640
February1st to 15thNight
14%13%6%11%8%34445%22%
2278
16th to endNight
17%13%47%6%3445%428%
1943
March1st to 15thNight
20%11%46%5%2334433%
2103
16th to endNight
17%6%45%43324344%
2031
April1st to 15thNight
23%8%345%33335%35%
1796
16th to endNight
19%8%25%424347%37%
1734
May1st to 15thNight
22%6%25%5%245%35%36%
1440
16th to endNight
17%6%35%3335%5%7%38%
1495
June1st to 15thNight
20%6%35%6%345%47%32%
1440
16th to endNight
16%5%35%5%25%5%6%8%36%
1440
July1st to 15thNight
10%414435%45%9%46%
1440
16th to endNight
9%334435%5%5%8%45%
1514
August1st to 15thNight
10%6%26%5%2446%8%43%
1523
16th to endNight
9%42442345%8%50%
1861
September1st to 15thNight
15%5%25%43435%6%43%
1800
16th to endNight
15%434322345%49%
1955
October1st to 15thNight
18%8%35%5%2335%7%36%
2051
16th to endNight
26%9%36%5%33446%25%
2201
November1st to 15thNight
20%8%36%5%35%335%33%
2322
16th to endNight
22%12%48%6%34345%25%
2520
December1st to 15thNight
22%15%5%7%6%34445%20%
2520
16th to endNight
24%16%48%7%2433419%
2688

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
68%39%12%6%1
1433
16th to endDay
61%413%12%7%
1582
February1st to 15thDay
63%311%18%3
1577
16th to endDay
60%211%14%9%1
1529
March1st to 15thDay
60%212%15%7%
1855
16th to endDay
45%310%20%15%5%
2193
April1st to 15thDay
53%37%19%13%2
2152
16th to endDay
48%38%20%15%3
2238
May1st to 15thDay
50%48%20%13%2
2511
16th to endDay
47%5%12%20%12%1
2622
June1st to 15thDay
52%5%10%20%9%
2520
16th to endDay
48%6%12%20%10%
2520
July1st to 15thDay
38%5%13%28%12%
2371
16th to endDay
42%7%16%23%9%
2487
August1st to 15thDay
45%5%14%22%10%
2422
16th to endDay
37%5%15%29%11%
2327
September1st to 15thDay
41%412%27%12%
2160
16th to endDay
37%5%12%33%10%
2001
October1st to 15thDay
50%412%22%9%
1707
16th to endDay
63%311%13%6%
1669
November1st to 15thDay
51%5%13%20%8%
1533
16th to endDay
60%412%14%6%
1440
December1st to 15thDay
70%411%12%1
1440
16th to endDay
68%410%11%5%
1536
January1st to 15thNight
68%49%11%5%
2506
16th to endNight
60%310%16%8%
2640
February1st to 15thNight
63%311%16%5%
2287
16th to endNight
58%310%18%9%
1943
March1st to 15thNight
57%210%19%8%1
2103
16th to endNight
47%39%19%16%4
2031
April1st to 15thNight
52%28%20%14%1
1796
16th to endNight
47%47%19%17%3
1734
May1st to 15thNight
49%47%19%14%4
1440
16th to endNight
43%5%13%21%13%2
1497
June1st to 15thNight
50%5%13%19%10%1
1440
16th to endNight
45%6%12%20%14%
1440
July1st to 15thNight
32%5%13%32%14%
1360
16th to endNight
35%5%15%27%15%
1418
August1st to 15thNight
38%6%17%23%12%
1513
16th to endNight
32%417%32%12%
1861
September1st to 15thNight
41%412%29%11%
1800
16th to endNight
36%410%35%11%
1955
October1st to 15thNight
47%410%25%11%
2051
16th to endNight
59%313%16%6%
2201
November1st to 15thNight
53%313%18%9%1
2322
16th to endNight
62%411%16%4
2520
December1st to 15thNight
66%5%11%13%3
2520
16th to endNight
68%49%11%5%
2688

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
31%20%26%15%5%1
60
16th to endDay
33%16%31%11%5%1
72
February1st to 15thDay
32%22%34%11%
90
16th to endDay
31%18%28%17%4
188
March1st to 15thDay
26%13%31%21%6%
270
16th to endDay
21%17%29%18%7%4
288
April1st to 15thDay
28%17%28%17%7%1
270
16th to endDay
25%17%25%17%8%5%
270
May1st to 15thDay
27%12%28%19%8%4
288
16th to endDay
18%13%38%16%11%1
331
June1st to 15thDay
25%10%30%22%8%2
315
16th to endDay
19%8%34%22%12%1
315
July1st to 15thDay
14%6%32%27%13%5%
305
16th to endDay
11%7%30%26%19%5%
326
August1st to 15thDay
12%10%26%28%15%6%
313
16th to endDay
10%5%27%28%15%12%
332
September1st to 15thDay
20%6%22%20%17%12%
315
16th to endDay
14%5%29%18%21%10%
314
October1st to 15thDay
20%11%25%24%12%5%
278
16th to endDay
32%16%21%21%5%
255
November1st to 15thDay
19%13%32%21%11%2
187
16th to endDay
31%16%28%23%
60
December1st to 15thDay
23%18%45%6%5%1
60
16th to endDay
39%26%28%6%
64
January1st to 15thNight
26%16%32%19%5%
720
16th to endNight
22%14%32%24%5%
768
February1st to 15thNight
21%16%36%19%4
704
16th to endNight
24%15%33%21%5%
631
March1st to 15thNight
27%13%33%22%3
720
16th to endNight
20%16%26%27%8%
768
April1st to 15thNight
26%14%29%24%5%
718
16th to endNight
23%14%27%25%8%
654
May1st to 15thNight
25%7%27%27%10%1
360
16th to endNight
18%8%32%26%13%
375
June1st to 15thNight
23%7%26%33%9%
360
16th to endNight
16%7%29%32%13%
360
July1st to 15thNight
10%5%25%44%13%1
340
16th to endNight
9%227%43%15%1
376
August1st to 15thNight
15%222%36%21%1
442
16th to endNight
12%326%32%22%2
715
September1st to 15thNight
19%424%31%17%2
720
16th to endNight
17%7%23%25%24%2
717
October1st to 15thNight
21%11%25%26%14%1
684
16th to endNight
31%13%23%23%7%
704
November1st to 15thNight
26%11%30%19%11%
700
16th to endNight
28%18%24%19%8%
720
December1st to 15thNight
31%14%29%20%4
720
16th to endNight
33%13%29%17%41
768
Page generated at 2017-10-07 14:07:48. Version ac04

Copyright 2017 A. Danko


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