Parc Canadian de la Mauricie
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Parc Canadian de la Mauricie clear sky chart from 2005-11-05 to 2017-08-12.

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
26%
14430
13%
46576
7%
14398
34%
14398
16%
33038

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
14%
720
11%
2506
3%
716
23%
716
10%
1913
January16th to endNight
18%
768
12%
2688
4%
768
28%
768
12%
1991
February1st to 15thNight
20%
704
11%
2352
3%
701
30%
701
13%
1733
February16th to endNight
20%
631
13%
1893
5%
631
31%
631
13%
1403
March1st to 15thNight
19%
720
14%
2160
7%
720
27%
720
13%
1619
March16th to endNight
26%
768
20%
2004
7%
768
35%
768
20%
1396
April1st to 15thNight
21%
718
17%
1796
4%
718
28%
718
18%
1358
April16th to endNight
22%
586
16%
1666
5%
586
31%
586
19%
1143
May1st to 15thNight
30%
393
15%
1473
11%
393
40%
393
16%
1005
May16th to endNight
27%
375
12%
1497
9%
374
39%
374
16%
1006
June1st to 15thNight
31%
360
7%
1440
6%
360
37%
360
13%
984
June16th to endNight
36%
360
6%
1440
6%
360
39%
360
15%
996
July1st to 15thNight
43%
340
8%
1360
11%
340
48%
340
21%
825
July16th to endNight
45%
376
11%
1418
12%
354
49%
354
21%
872
August1st to 15thNight
51%
356
13%
1405
13%
354
56%
354
21%
862
August16th to endNight
45%
649
16%
1699
9%
649
48%
649
30%
1102
September1st to 15thNight
38%
660
13%
1655
6%
660
41%
660
29%
1132
September16th to endNight
38%
657
19%
1815
11%
657
44%
657
30%
1166
October1st to 15thNight
27%
660
19%
1925
8%
660
38%
660
19%
1332
October16th to endNight
20%
704
11%
2285
5%
704
29%
704
16%
1653
November1st to 15thNight
27%
700
16%
2277
9%
700
36%
700
15%
1615
November16th to endNight
21%
720
13%
2514
8%
720
30%
720
11%
1852
December1st to 15thNight
18%
737
8%
2620
3%
737
25%
737
10%
1989
December16th to endNight
12%
768
12%
2688
3%
768
22%
768
8%
2091

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
19%9%37%6%35%446%28%
47386
Night
18%10%46%5%34446%31%
46745
TransparencyDay
55%5%10%18%9%1
47073
Night
53%411%20%9%
46576
SeeingDay
25%13%29%20%8%2
5419
Night
24%11%30%24%8%
14430

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
16%14%6%9%7%4443422%
1432
16th to endDay
11%13%6%9%7%35%5%35%26%
1536
February1st to 15thDay
10%16%410%9%46%445%23%
1505
16th to endDay
14%17%6%9%7%3433425%
1580
March1st to 15thDay
16%13%49%5%45%346%28%
1790
16th to endDay
14%10%47%6%34435%34%
2217
April1st to 15thDay
23%10%36%5%3333431%
2152
16th to endDay
21%8%35%5%33445%35%
2292
May1st to 15thDay
23%7%46%5%34345%30%
2488
16th to endDay
23%8%36%5%35%437%27%
2618
June1st to 15thDay
24%6%36%6%35%45%7%27%
2520
16th to endDay
21%7%37%7%36%5%5%6%25%
2520
July1st to 15thDay
17%6%36%7%36%5%6%7%28%
2520
16th to endDay
15%6%26%7%46%5%7%7%28%
2654
August1st to 15thDay
18%7%36%7%46%5%7%8%25%
2448
16th to endDay
13%6%35%6%35%6%7%8%33%
2149
September1st to 15thDay
18%6%25%6%34447%35%
1975
16th to endDay
19%5%25%424346%41%
1815
October1st to 15thDay
26%8%25%5%24446%28%
1702
16th to endDay
25%13%37%5%34446%21%
1587
November1st to 15thDay
19%12%47%6%34436%28%
1581
16th to endDay
21%14%47%42343429%
1446
December1st to 15thDay
24%16%5%6%434335%23%
1323
16th to endDay
23%14%48%6%4334422%
1536
January1st to 15thNight
17%16%7%8%5%24447%21%
2506
16th to endNight
12%13%6%9%7%35%445%25%
2688
February1st to 15thNight
9%12%6%9%8%46%446%27%
2350
16th to endNight
15%12%48%6%35%446%27%
1893
March1st to 15thNight
17%12%48%7%34346%26%
2147
16th to endNight
13%10%45%43444438%
2004
April1st to 15thNight
23%9%45%5%34345%31%
1796
16th to endNight
20%9%25%313346%37%
1666
May1st to 15thNight
22%7%35%435%436%34%
1473
16th to endNight
22%7%3442445%7%33%
1495
June1st to 15thNight
22%6%36%5%245%47%31%
1440
16th to endNight
18%7%35%6%45%5%6%6%31%
1440
July1st to 15thNight
13%5%25%435%5%6%8%38%
1440
16th to endNight
14%5%25%5%35%45%5%42%
1514
August1st to 15thNight
14%425%5%345%6%9%38%
1415
16th to endNight
14%5%245%25%35%8%43%
1699
September1st to 15thNight
15%6%25%42436%6%40%
1655
16th to endNight
19%5%23413445%47%
1815
October1st to 15thNight
21%7%25%424346%37%
1925
16th to endNight
25%8%35%5%24347%28%
2285
November1st to 15thNight
21%7%36%5%3445%5%32%
2277
16th to endNight
22%12%5%7%5%24335%26%
2514
December1st to 15thNight
22%15%47%6%34445%23%
2620
16th to endNight
21%15%5%9%6%24345%21%
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
64%5%7%16%6%
1433
16th to endDay
60%38%18%7%1
1536
February1st to 15thDay
63%310%15%6%
1507
16th to endDay
62%27%16%9%1
1580
March1st to 15thDay
58%39%14%12%1
1800
16th to endDay
52%47%18%14%3
2217
April1st to 15thDay
56%37%17%11%3
2152
16th to endDay
51%38%18%14%3
2292
May1st to 15thDay
56%47%17%12%1
2488
16th to endDay
57%5%8%16%10%1
2622
June1st to 15thDay
55%6%11%16%8%1
2520
16th to endDay
57%6%9%16%8%
2520
July1st to 15thDay
50%7%13%20%8%
2371
16th to endDay
51%7%14%18%7%
2487
August1st to 15thDay
53%8%15%17%4
2434
16th to endDay
43%7%16%22%8%
2149
September1st to 15thDay
46%6%14%23%9%
1975
16th to endDay
45%413%28%8%
1815
October1st to 15thDay
56%410%19%7%
1702
16th to endDay
62%5%11%16%4
1587
November1st to 15thDay
57%410%17%8%1
1581
16th to endDay
58%49%20%7%
1446
December1st to 15thDay
64%312%16%3
1323
16th to endDay
64%48%13%9%
1536
January1st to 15thNight
62%39%16%6%
2506
16th to endNight
59%39%17%8%
2688
February1st to 15thNight
57%311%18%7%1
2352
16th to endNight
57%39%15%11%1
1893
March1st to 15thNight
57%48%17%10%1
2160
16th to endNight
47%49%20%15%3
2004
April1st to 15thNight
55%35%19%13%2
1796
16th to endNight
48%39%21%14%3
1666
May1st to 15thNight
51%410%16%13%2
1473
16th to endNight
49%5%12%18%11%1
1497
June1st to 15thNight
51%6%13%18%8%1
1440
16th to endNight
50%8%10%18%11%1
1440
July1st to 15thNight
40%6%19%20%11%
1360
16th to endNight
42%5%17%24%9%
1418
August1st to 15thNight
41%6%18%27%5%
1405
16th to endNight
39%5%18%28%8%
1699
September1st to 15thNight
42%5%17%25%9%
1655
16th to endNight
40%314%32%9%
1815
October1st to 15thNight
48%411%23%11%
1925
16th to endNight
54%412%21%6%
2285
November1st to 15thNight
52%5%12%19%8%1
2277
16th to endNight
59%310%19%5%
2514
December1st to 15thNight
61%412%16%3
2620
16th to endNight
65%39%13%7%
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
30%16%31%15%6%
60
16th to endDay
26%14%34%17%7%
64
February1st to 15thDay
28%27%32%9%1
83
16th to endDay
27%19%31%16%4
239
March1st to 15thDay
26%17%33%17%4
270
16th to endDay
21%19%27%18%9%3
288
April1st to 15thDay
30%16%26%19%5%1
270
16th to endDay
24%19%30%14%7%2
270
May1st to 15thDay
32%13%31%14%5%2
288
16th to endDay
24%16%34%15%8%
331
June1st to 15thDay
29%13%29%18%8%
315
16th to endDay
26%10%34%22%6%
315
July1st to 15thDay
18%9%35%23%9%3
305
16th to endDay
15%7%29%35%11%1
326
August1st to 15thDay
20%6%25%27%17%2
297
16th to endDay
15%7%29%26%14%6%
268
September1st to 15thDay
24%7%27%20%12%7%
255
16th to endDay
18%14%28%17%12%8%
254
October1st to 15thDay
28%12%26%19%10%3
255
16th to endDay
33%14%21%21%8%
241
November1st to 15thDay
24%14%28%20%10%1
235
16th to endDay
33%16%30%15%4
66
December1st to 15thDay
41%8%31%13%13
60
16th to endDay
37%31%23%7%
64
January1st to 15thNight
27%12%36%19%4
720
16th to endNight
20%11%38%21%7%
768
February1st to 15thNight
16%13%39%25%5%
704
16th to endNight
22%14%33%22%6%
631
March1st to 15thNight
26%14%34%20%4
720
16th to endNight
19%17%30%23%8%1
768
April1st to 15thNight
30%12%28%21%6%
718
16th to endNight
26%14%32%19%6%
586
May1st to 15thNight
27%7%30%25%8%
393
16th to endNight
26%9%31%23%8%
375
June1st to 15thNight
27%8%25%31%7%
360
16th to endNight
23%5%25%35%10%
360
July1st to 15thNight
13%5%30%36%14%
340
16th to endNight
18%325%36%15%
376
August1st to 15thNight
14%220%41%19%1
356
16th to endNight
17%5%25%33%16%1
649
September1st to 15thNight
18%5%30%29%13%1
660
16th to endNight
22%7%28%26%13%1
657
October1st to 15thNight
24%11%30%23%9%1
660
16th to endNight
32%10%31%17%6%
704
November1st to 15thNight
25%12%27%24%9%1
700
16th to endNight
30%15%25%19%7%1
720
December1st to 15thNight
31%12%31%19%5%
737
16th to endNight
32%14%30%16%41
768
Page generated at 2017-08-13 14:16:18. Version ac04

Copyright 2017 A. Danko


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