Campement Péribonka
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Campement Péribonka 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
25%
14555
8%
47017
5%
14524
29%
14524
11%
37042

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%
736
8%
2601
5%
732
23%
732
7%
2172
January16th to endNight
26%
768
9%
2688
6%
768
30%
768
9%
2159
February1st to 15thNight
29%
703
9%
2441
6%
701
35%
701
11%
1880
February16th to endNight
24%
631
9%
1893
6%
631
28%
631
10%
1554
March1st to 15thNight
27%
720
11%
2160
9%
720
31%
720
14%
1641
March16th to endNight
27%
768
16%
2022
7%
768
33%
768
18%
1527
April1st to 15thNight
25%
688
12%
1766
5%
688
28%
688
15%
1416
April16th to endNight
26%
540
14%
1620
8%
540
33%
540
17%
1177
May1st to 15thNight
28%
392
9%
1472
9%
392
34%
392
12%
1066
May16th to endNight
26%
375
9%
1343
5%
374
34%
374
13%
978
June1st to 15thNight
31%
360
3%
1260
1%
360
32%
360
14%
907
June16th to endNight
36%
360
3%
1260
1%
360
36%
360
14%
925
July1st to 15thNight
37%
340
3%
1190
2%
340
38%
340
15%
866
July16th to endNight
40%
376
7%
1410
10%
354
43%
354
13%
1001
August1st to 15thNight
41%
368
8%
1439
8%
366
44%
366
12%
1056
August16th to endNight
34%
600
9%
1746
6%
600
37%
600
16%
1303
September1st to 15thNight
33%
720
7%
1839
4%
720
35%
720
19%
1388
September16th to endNight
28%
717
12%
1980
7%
717
32%
717
18%
1471
October1st to 15thNight
21%
684
11%
2010
5%
684
28%
684
14%
1528
October16th to endNight
17%
704
5%
2288
4%
704
19%
704
6%
1968
November1st to 15thNight
17%
705
9%
2309
6%
705
21%
705
8%
1922
November16th to endNight
18%
750
5%
2700
4%
750
20%
750
5%
2333
December1st to 15thNight
15%
750
3%
2700
1%
750
17%
750
5%
2355
December16th to endNight
19%
800
7%
2880
4%
800
23%
800
6%
2449

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
21%12%5%8%6%34445%22%
48197
Night
18%12%5%8%6%35%445%22%
47176
TransparencyDay
63%5%10%13%6%
47873
Night
63%5%10%14%5%
47018
SeeingDay
29%10%27%19%9%2
6301
Night
25%11%28%23%9%1
14556

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
13%18%7%12%9%46%5%5%312%
1334
16th to endDay
10%15%6%11%9%38%6%6%5%17%
1536
February1st to 15thDay
7%12%7%10%10%7%8%7%5%5%18%
1421
16th to endDay
11%17%6%11%9%35%6%4417%
1580
March1st to 15thDay
15%12%7%8%6%46%5%5%423%
1790
16th to endDay
12%16%7%9%6%3444427%
2200
April1st to 15thDay
18%17%5%7%6%23345%24%
2181
16th to endDay
19%12%47%5%2443428%
2340
May1st to 15thDay
23%9%36%6%34445%27%
2490
16th to endDay
22%8%36%5%345%46%28%
2771
June1st to 15thDay
21%8%37%5%345%46%27%
2700
16th to endDay
25%8%36%7%3445%7%22%
2700
July1st to 15thDay
27%9%36%5%45%5%46%21%
2700
16th to endDay
19%9%36%6%45%45%7%25%
2660
August1st to 15thDay
26%10%47%7%45%45%5%19%
2498
16th to endDay
24%11%36%7%34446%22%
2453
September1st to 15thDay
27%10%26%423335%28%
2121
16th to endDay
29%10%36%5%2323426%
1980
October1st to 15thDay
27%13%46%5%24345%23%
1746
16th to endDay
32%22%6%7%42222414%
1584
November1st to 15thDay
25%16%7%8%7%3432416%
1548
16th to endDay
24%20%9%8%6%23335%12%
1260
December1st to 15thDay
20%17%8%12%7%5%6%32311%
1260
16th to endDay
15%20%7%12%8%5%6%33313%
1344
January1st to 15thNight
16%15%6%12%8%46%445%14%
2601
16th to endNight
10%14%6%10%8%7%7%8%5%5%14%
2688
February1st to 15thNight
8%9%6%10%10%48%7%6%5%20%
2439
16th to endNight
10%15%7%12%9%46%5%3419%
1893
March1st to 15thNight
14%12%6%9%6%46%5%5%425%
2147
16th to endNight
10%16%5%9%425%345%30%
2022
April1st to 15thNight
20%13%5%8%6%3433425%
1766
16th to endNight
20%9%36%5%34346%31%
1620
May1st to 15thNight
19%11%46%5%35%335%28%
1472
16th to endNight
21%9%45%6%34336%31%
1342
June1st to 15thNight
19%9%36%6%346%5%6%28%
1260
16th to endNight
18%10%36%6%345%5%6%28%
1260
July1st to 15thNight
19%6%37%6%345%6%7%28%
1260
16th to endNight
18%7%26%5%36%5%5%7%30%
1505
August1st to 15thNight
20%9%36%6%4445%7%27%
1449
16th to endNight
18%7%36%6%35%5%6%7%28%
1746
September1st to 15thNight
24%6%25%5%34446%32%
1839
16th to endNight
23%7%25%5%24445%34%
1980
October1st to 15thNight
22%10%35%6%25%445%28%
2010
16th to endNight
31%17%48%6%2324415%
2288
November1st to 15thNight
24%17%7%8%5%2323418%
2309
16th to endNight
21%18%7%12%6%35%33414%
2700
December1st to 15thNight
18%17%8%11%8%5%5%435%12%
2700
16th to endNight
16%17%6%12%8%36%5%45%12%
2880

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
74%47%10%3
1335
16th to endDay
65%48%12%7%1
1536
February1st to 15thDay
65%5%8%12%7%1
1423
16th to endDay
66%5%8%12%6%
1580
March1st to 15thDay
63%47%13%10%
1800
16th to endDay
61%39%15%10%
2200
April1st to 15thDay
63%38%14%8%1
2181
16th to endDay
58%47%17%10%1
2340
May1st to 15thDay
58%5%9%14%10%1
2490
16th to endDay
55%6%10%16%10%
2775
June1st to 15thDay
56%5%9%16%11%1
2700
16th to endDay
61%5%11%13%7%
2700
July1st to 15thDay
60%6%12%16%3
2541
16th to endDay
58%7%13%16%4
2492
August1st to 15thDay
66%7%12%10%2
2484
16th to endDay
62%8%13%13%2
2453
September1st to 15thDay
58%5%13%17%5%
2121
16th to endDay
62%6%12%15%3
1980
October1st to 15thDay
64%411%12%6%1
1746
16th to endDay
77%37%8%3
1584
November1st to 15thDay
73%410%8%2
1548
16th to endDay
75%5%8%9%
1260
December1st to 15thDay
78%48%7%1
1260
16th to endDay
76%36%8%4
1344
January1st to 15thNight
72%48%10%3
2601
16th to endNight
67%5%9%14%3
2688
February1st to 15thNight
62%410%13%7%
2441
16th to endNight
66%6%7%15%4
1893
March1st to 15thNight
60%310%15%8%
2160
16th to endNight
56%38%19%10%1
2022
April1st to 15thNight
63%36%14%10%1
1766
16th to endNight
53%5%9%18%11%1
1620
May1st to 15thNight
57%5%11%15%10%
1472
16th to endNight
55%6%7%16%13%
1344
June1st to 15thNight
55%5%10%16%10%
1260
16th to endNight
53%8%11%15%9%
1260
July1st to 15thNight
52%9%15%17%5%
1190
16th to endNight
52%8%12%22%4
1410
August1st to 15thNight
55%8%17%14%2
1439
16th to endNight
52%10%17%17%2
1746
September1st to 15thNight
52%7%16%16%6%
1839
16th to endNight
53%6%14%20%4
1980
October1st to 15thNight
57%6%14%15%5%
2010
16th to endNight
74%5%8%9%2
2288
November1st to 15thNight
71%310%10%3
2309
16th to endNight
75%5%9%7%2
2700
December1st to 15thNight
76%5%9%7%1
2700
16th to endNight
73%5%8%9%2
2880

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
20%16%40%20%11
60
16th to endDay
28%7%26%20%15%1
64
February1st to 15thDay
11%11%28%32%14%1
77
16th to endDay
25%12%28%20%11%1
239
March1st to 15thDay
24%14%25%23%9%1
270
16th to endDay
19%14%32%19%11%3
288
April1st to 15thDay
27%12%29%21%6%2
270
16th to endDay
24%12%35%17%6%3
270
May1st to 15thDay
26%9%28%23%10%1
288
16th to endDay
27%14%32%16%8%1
485
June1st to 15thDay
27%11%24%23%10%2
495
16th to endDay
30%10%25%19%11%2
495
July1st to 15thDay
29%6%27%23%10%2
475
16th to endDay
29%6%20%26%13%1
331
August1st to 15thDay
32%5%24%22%11%3
313
16th to endDay
31%8%26%16%12%4
332
September1st to 15thDay
31%9%27%17%9%4
315
16th to endDay
34%12%24%17%7%3
314
October1st to 15thDay
32%10%30%14%8%2
267
16th to endDay
46%10%22%12%6%1
240
November1st to 15thDay
40%12%27%11%6%1
229
16th to endDay
45%16%23%11%3
60
December1st to 15thDay
31%6%33%18%5%5%
60
16th to endDay
29%23%26%15%4
64
January1st to 15thNight
23%12%34%22%7%
736
16th to endNight
18%11%30%26%10%1
768
February1st to 15thNight
12%11%33%29%12%1
704
16th to endNight
17%14%31%25%9%1
631
March1st to 15thNight
19%15%31%23%8%
720
16th to endNight
19%14%31%25%8%
768
April1st to 15thNight
28%10%27%24%7%
688
16th to endNight
24%11%32%22%7%1
540
May1st to 15thNight
26%9%30%22%11%
392
16th to endNight
25%11%28%29%4
375
June1st to 15thNight
25%5%28%27%12%
360
16th to endNight
22%6%27%31%10%1
360
July1st to 15thNight
20%6%29%27%15%
340
16th to endNight
22%5%24%32%14%1
376
August1st to 15thNight
26%321%29%17%1
368
16th to endNight
26%426%27%12%1
600
September1st to 15thNight
30%8%23%25%9%2
720
16th to endNight
29%9%28%20%10%
717
October1st to 15thNight
31%11%30%17%6%
684
16th to endNight
41%11%21%16%8%
704
November1st to 15thNight
36%15%23%16%6%1
705
16th to endNight
31%16%26%19%6%
750
December1st to 15thNight
27%17%30%17%6%1
750
16th to endNight
27%16%24%20%8%2
800
Page generated at 2017-10-07 14:07:48. Version ac04

Copyright 2017 A. Danko


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