Papineau Regional County Municipality
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Papineau Regional County Municipality clear sky chart from 2005-11-06 to 2024-02-10.

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%
22614
13%
80545
8%
22528
36%
22528
14%
57931

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
14%
754
7%
4400
2%
737
22%
737
4%
3270
January11th to 20thNight
17%
754
8%
4407
4%
740
25%
740
5%
3295
January21st to endNight
20%
830
7%
4842
7%
814
29%
814
6%
3857
February1st to 10thNight
17%
759
11%
2464
4%
759
26%
759
11%
1874
February11th to 20thNight
17%
703
14%
2248
6%
700
29%
700
13%
1683
February21st to endNight
22%
592
15%
1776
6%
592
32%
592
14%
1312
March1st to 10thNight
20%
720
14%
2160
8%
720
29%
720
14%
1630
March11th to 20thNight
22%
720
15%
2017
6%
720
30%
720
16%
1476
March21st to endNight
25%
792
20%
2034
7%
792
34%
792
19%
1467
April1st to 10thNight
23%
720
15%
1800
5%
720
28%
720
19%
1341
April11th to 20thNight
26%
711
17%
1775
5%
711
32%
711
22%
1279
April21st to endNight
26%
595
16%
1675
7%
595
33%
595
18%
1202
May1st to 10thNight
31%
360
16%
1440
11%
360
42%
360
15%
942
May11th to 20thNight
34%
354
21%
1416
17%
354
49%
354
18%
885
May21st to endNight
34%
389
13%
1551
9%
388
47%
388
19%
968
June1st to 10thNight
37%
360
9%
1440
9%
360
46%
360
16%
948
June11th to 20thNight
41%
360
11%
1440
13%
360
48%
360
18%
893
June21st to endNight
42%
360
10%
1440
14%
360
47%
360
16%
945
July1st to 10thNight
49%
350
13%
1400
17%
350
57%
350
24%
806
July11th to 20thNight
53%
348
14%
1392
21%
348
57%
348
23%
824
July21st to endNight
51%
394
13%
1486
14%
372
55%
372
21%
889
August1st to 10thNight
58%
358
15%
1422
16%
356
62%
356
21%
851
August11th to 20thNight
57%
540
17%
1604
13%
540
60%
540
30%
1027
August21st to endNight
46%
792
17%
1980
7%
792
50%
792
30%
1327
September1st to 10thNight
47%
720
16%
1800
6%
720
50%
720
31%
1205
September11th to 20thNight
50%
720
20%
1822
11%
720
53%
720
33%
1172
September21st to endNight
41%
720
21%
2001
14%
720
47%
720
28%
1320
October1st to 10thNight
33%
720
18%
2160
11%
720
42%
720
19%
1502
October11th to 20thNight
28%
720
14%
2160
8%
720
36%
720
16%
1582
October21st to endNight
22%
792
11%
2556
6%
792
30%
792
13%
1913
November1st to 10thNight
29%
740
15%
2407
9%
740
38%
740
16%
1716
November11th to 20thNight
21%
760
14%
2630
9%
760
29%
760
12%
1933
November21st to endNight
18%
760
9%
2660
5%
760
24%
760
8%
2080
December1st to 10thNight
15%
760
8%
2660
3%
760
21%
760
7%
2167
December11th to 20thNight
16%
759
12%
3239
5%
759
25%
759
8%
2476
December21st to endNight
12%
828
7%
4841
2%
817
20%
817
4%
3874

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%10%47%6%35%45%6%31%
78095
Night
17%11%47%6%35%45%6%31%
80874
TransparencyDay
53%6%11%18%10%1
77800
Night
54%6%12%18%9%1
80703
SeeingDay
24%15%30%20%8%2
13431
Night
23%12%29%25%10%1
22641

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 10thDay
15%18%7%14%8%45%44419%
2517
11th to 20thDay
15%14%7%14%9%34446%21%
2520
21st to endDay
13%16%8%12%8%46%5%5%5%19%
2808
February1st to 10thDay
13%16%6%12%8%45%45%5%23%
1701
11th to 20thDay
13%16%6%11%7%34345%28%
1599
21st to endDay
18%15%6%8%7%4444425%
1480
March1st to 10thDay
16%12%410%8%4445%6%29%
1797
11th to 20thDay
16%13%47%8%445%36%29%
1939
21st to endDay
19%10%47%5%2435%5%36%
2321
April1st to 10thDay
22%12%47%5%33345%31%
2160
11th to 20thDay
22%8%46%6%3345%5%35%
2134
21st to endDay
22%10%47%5%44445%31%
2301
May1st to 10thDay
22%9%36%6%34446%33%
2520
11th to 20thDay
19%8%36%5%345%46%37%
2478
21st to endDay
19%6%35%6%35%5%5%7%35%
2725
June1st to 10thDay
23%7%36%6%35%45%7%28%
2520
11th to 20thDay
15%6%35%5%35%5%6%9%37%
2520
21st to endDay
20%6%36%6%46%5%7%8%29%
2520
July1st to 10thDay
12%6%36%7%45%6%6%9%38%
2520
11th to 20thDay
14%5%36%6%45%6%7%9%34%
2520
21st to endDay
13%5%36%6%46%5%6%9%36%
2744
August1st to 10thDay
13%7%27%7%45%5%7%8%35%
2506
11th to 20thDay
13%6%36%6%46%5%6%9%37%
2276
21st to endDay
14%6%26%5%45%46%7%40%
2376
September1st to 10thDay
15%6%35%5%35%5%5%6%42%
2160
11th to 20thDay
16%425%5%3445%8%44%
2138
21st to endDay
19%7%35%5%3335%7%40%
1957
October1st to 10thDay
23%7%35%6%3345%6%35%
1800
11th to 20thDay
26%9%37%6%345%47%25%
1800
21st to endDay
26%11%47%5%345%45%26%
1800
November1st to 10thDay
16%10%38%5%4446%7%34%
1671
11th to 20thDay
21%13%5%8%7%45%45%5%24%
1549
21st to endDay
22%14%5%8%7%346%45%22%
1520
December1st to 10thDay
23%17%6%11%5%34445%17%
1520
11th to 20thDay
19%15%6%10%7%34446%22%
1906
21st to endDay
26%20%6%8%6%3333419%
2772
January1st to 10thNight
17%17%7%9%7%3445%5%23%
4429
11th to 20thNight
12%15%6%12%9%45%45%6%23%
4440
21st to endNight
14%16%8%11%8%46%445%21%
4846
February1st to 10thNight
13%13%6%11%8%46%5%5%6%25%
2464
11th to 20thNight
13%13%6%10%8%45%445%29%
2246
21st to endNight
15%13%5%9%6%346%45%30%
1776
March1st to 10thNight
16%13%5%8%7%46%445%28%
2150
11th to 20thNight
16%13%5%7%6%35%445%33%
2016
21st to endNight
17%9%37%5%25%45%5%39%
2034
April1st to 10thNight
22%11%26%6%4445%6%32%
1800
11th to 20thNight
20%7%45%6%3445%7%36%
1775
21st to endNight
20%10%37%5%3445%6%34%
1675
May1st to 10thNight
21%7%36%5%35%447%35%
1440
11th to 20thNight
19%5%36%5%245%46%41%
1415
21st to endNight
15%5%36%5%35%46%7%41%
1550
June1st to 10thNight
16%7%35%5%26%7%7%9%33%
1440
11th to 20thNight
15%7%36%435%46%7%40%
1440
21st to endNight
18%8%25%435%5%6%7%38%
1440
July1st to 10thNight
11%5%25%5%35%6%5%8%46%
1440
11th to 20thNight
12%6%25%6%345%7%8%43%
1440
21st to endNight
10%5%36%5%45%6%6%9%43%
1574
August1st to 10thNight
10%6%36%5%35%6%7%10%41%
1432
11th to 20thNight
11%5%25%4345%6%7%46%
1604
21st to endNight
12%5%36%435%47%7%45%
1980
September1st to 10thNight
13%5%25%5%35%46%6%46%
1800
11th to 20thNight
16%43343346%6%48%
1822
21st to endNight
17%5%25%5%3345%7%44%
2001
October1st to 10thNight
19%8%36%43445%6%37%
2160
11th to 20thNight
22%8%36%6%4445%6%31%
2160
21st to endNight
24%10%47%6%34446%29%
2556
November1st to 10thNight
20%10%46%5%4445%6%32%
2407
11th to 20thNight
19%11%47%7%4445%6%29%
2630
21st to endNight
21%13%5%8%7%345%5%6%23%
2660
December1st to 10thNight
21%17%6%9%7%45%446%19%
2660
11th to 20thNight
22%14%5%8%6%24445%26%
3288
21st to endNight
26%22%48%5%3343420%
4884

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
69%6%9%11%5%1
2518
11th to 20thDay
65%6%9%13%6%1
2520
21st to endDay
67%7%10%10%6%
2808
February1st to 10thDay
63%49%16%7%2
1701
11th to 20thDay
60%411%14%9%1
1608
21st to endDay
63%49%14%9%1
1480
March1st to 10thDay
58%5%9%16%10%2
1800
11th to 20thDay
56%5%11%14%12%3
1939
21st to endDay
50%5%9%18%14%4
2321
April1st to 10thDay
56%39%18%11%3
2160
11th to 20thDay
51%5%8%19%14%2
2134
21st to endDay
55%5%8%14%13%4
2301
May1st to 10thDay
52%5%8%18%14%3
2520
11th to 20thDay
47%5%10%19%16%2
2482
21st to endDay
47%7%12%18%14%2
2725
June1st to 10thDay
53%7%11%17%11%1
2520
11th to 20thDay
44%7%12%22%12%3
2520
21st to endDay
51%8%13%17%9%1
2520
July1st to 10thDay
40%9%14%26%11%
2450
11th to 20thDay
43%9%14%23%10%
2445
21st to endDay
44%9%15%23%9%
2591
August1st to 10thDay
45%9%16%23%7%
2492
11th to 20thDay
42%9%16%24%9%1
2276
21st to endDay
41%6%15%25%11%1
2376
September1st to 10thDay
40%7%13%26%13%
2160
11th to 20thDay
38%7%14%29%11%1
2138
21st to endDay
44%6%15%27%8%
1957
October1st to 10thDay
51%5%12%21%11%1
1800
11th to 20thDay
59%7%14%15%5%1
1800
21st to endDay
60%7%11%15%6%1
1800
November1st to 10thDay
49%6%17%21%6%1
1671
11th to 20thDay
61%7%12%12%8%1
1549
21st to endDay
64%7%12%11%5%1
1520
December1st to 10thDay
70%6%10%11%3
1520
11th to 20thDay
64%7%12%13%5%
1906
21st to endDay
70%5%7%13%5%
2772
January1st to 10thNight
63%7%16%11%3
4429
11th to 20thNight
60%9%13%13%5%1
4440
21st to endNight
66%7%10%9%7%1
4846
February1st to 10thNight
60%5%10%17%7%1
2464
11th to 20thNight
59%410%18%8%1
2248
21st to endNight
56%5%9%18%11%1
1776
March1st to 10thNight
58%5%9%16%9%2
2160
11th to 20thNight
54%5%11%16%11%3
2017
21st to endNight
49%6%7%19%15%4
2034
April1st to 10thNight
53%410%17%13%2
1800
11th to 20thNight
48%6%8%22%16%1
1775
21st to endNight
51%5%10%17%14%3
1675
May1st to 10thNight
50%49%17%17%4
1440
11th to 20thNight
44%6%8%20%18%4
1416
21st to endNight
43%6%12%20%16%2
1551
June1st to 10thNight
46%8%13%23%10%
1440
11th to 20thNight
42%7%12%23%14%2
1440
21st to endNight
46%8%13%20%13%1
1440
July1st to 10thNight
35%8%15%26%15%1
1400
11th to 20thNight
37%8%13%30%11%1
1392
21st to endNight
37%9%17%23%13%
1486
August1st to 10thNight
37%10%18%26%9%
1422
11th to 20thNight
36%8%18%28%10%
1604
21st to endNight
38%8%16%27%11%
1980
September1st to 10thNight
38%7%14%27%13%1
1800
11th to 20thNight
36%6%15%33%10%1
1822
21st to endNight
40%6%13%31%10%
2001
October1st to 10thNight
48%6%9%24%12%1
2160
11th to 20thNight
54%6%12%20%8%
2160
21st to endNight
57%7%13%16%7%1
2556
November1st to 10thNight
52%6%14%19%8%
2407
11th to 20thNight
56%7%13%15%8%1
2630
21st to endNight
63%6%12%15%4
2660
December1st to 10thNight
68%6%10%12%4
2660
11th to 20thNight
63%5%9%15%7%1
3288
21st to endNight
70%5%7%14%5%
4884

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
26%17%32%22%4
180
11th to 20thDay
28%19%34%12%6%1
180
21st to endDay
22%16%36%20%5%
209
February1st to 10thDay
33%23%30%12%2
267
11th to 20thDay
30%26%33%11%
266
21st to endDay
29%19%34%16%2
346
March1st to 10thDay
25%21%31%17%5%
420
11th to 20thDay
28%21%32%15%41
420
21st to endDay
32%18%25%17%7%1
462
April1st to 10thDay
30%17%31%15%6%1
420
11th to 20thDay
31%20%23%16%8%1
412
21st to endDay
30%19%31%13%5%1
420
May1st to 10thDay
28%15%34%15%5%2
423
11th to 20thDay
23%17%31%18%8%2
447
21st to endDay
23%14%34%19%8%2
485
June1st to 10thDay
26%12%32%21%8%1
450
11th to 20thDay
20%16%30%22%11%2
450
21st to endDay
23%12%28%24%11%2
450
July1st to 10thDay
15%9%31%30%11%4
445
11th to 20thDay
13%10%35%26%13%3
444
21st to endDay
14%8%35%29%13%2
488
August1st to 10thDay
16%7%26%37%12%2
446
11th to 20thDay
14%8%23%32%15%8%
439
21st to endDay
18%10%28%23%13%7%
495
September1st to 10thDay
17%11%29%23%14%6%
450
11th to 20thDay
15%12%24%23%17%9%
450
21st to endDay
21%14%26%21%13%4
450
October1st to 10thDay
28%15%22%20%13%3
450
11th to 20thDay
30%20%27%15%7%1
450
21st to endDay
34%16%28%18%4
405
November1st to 10thDay
27%15%30%21%7%1
365
11th to 20thDay
31%17%36%11%41
209
21st to endDay
33%18%32%14%31
180
December1st to 10thDay
31%14%33%20%2
180
11th to 20thDay
27%19%39%11%3
180
21st to endDay
35%21%31%10%31
198
January1st to 10thNight
28%16%33%19%5%
760
11th to 20thNight
29%16%30%20%5%
760
21st to endNight
21%13%35%23%6%1
836
February1st to 10thNight
20%16%36%23%4
759
11th to 20thNight
21%18%36%20%41
703
21st to endNight
23%18%28%27%31
592
March1st to 10thNight
24%15%34%22%5%
720
11th to 20thNight
26%17%31%21%5%1
720
21st to endNight
24%14%32%22%8%
792
April1st to 10thNight
29%15%27%25%5%
720
11th to 20thNight
25%16%30%22%7%1
711
21st to endNight
26%14%30%22%7%1
595
May1st to 10thNight
24%12%27%26%9%2
360
11th to 20thNight
23%10%27%31%9%
354
21st to endNight
17%8%35%28%12%1
389
June1st to 10thNight
18%7%30%37%9%
360
11th to 20thNight
19%8%24%35%12%1
360
21st to endNight
19%5%25%34%15%1
360
July1st to 10thNight
9%6%30%39%17%
350
11th to 20thNight
14%419%43%19%1
348
21st to endNight
11%5%26%41%16%2
394
August1st to 10thNight
14%416%43%22%1
358
11th to 20thNight
14%419%35%26%3
540
21st to endNight
16%7%24%33%19%2
792
September1st to 10thNight
16%6%27%32%19%1
720
11th to 20thNight
18%8%20%31%20%3
720
21st to endNight
20%8%27%27%18%2
720
October1st to 10thNight
23%11%26%24%14%1
720
11th to 20thNight
26%12%27%25%9%1
720
21st to endNight
29%12%30%23%5%
792
November1st to 10thNight
27%12%25%25%8%1
740
11th to 20thNight
28%15%29%17%11%1
760
21st to endNight
29%17%27%21%6%
760
December1st to 10thNight
30%16%31%19%4
760
11th to 20thNight
30%16%31%18%5%1
760
21st to endNight
36%14%29%17%3
836
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