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 2018-02-22.

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%
15207
13%
49026
7%
15175
34%
15175
16%
34742

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%
780
11%
2716
3%
776
24%
776
11%
2062
January16th to endNight
18%
832
12%
2912
4%
832
28%
832
12%
2145
February1st to 15thNight
20%
764
11%
2552
3%
761
30%
761
13%
1883
February16th to endNight
20%
659
14%
1976
5%
659
31%
659
13%
1466
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%
365
13%
1436
13%
363
56%
363
20%
887
August16th to endNight
45%
708
18%
1854
9%
708
48%
708
30%
1197
September1st to 15thNight
40%
720
13%
1806
6%
720
42%
720
30%
1220
September16th to endNight
40%
717
20%
1980
12%
717
46%
717
30%
1261
October1st to 15thNight
29%
720
18%
2100
8%
720
40%
720
21%
1432
October16th to endNight
20%
768
12%
2493
6%
768
30%
768
16%
1807
November1st to 15thNight
27%
760
16%
2472
8%
760
36%
760
14%
1761
November16th to endNight
21%
780
14%
2724
8%
780
30%
780
11%
2003
December1st to 15thNight
17%
806
9%
2839
3%
806
25%
806
9%
2160
December16th to endNight
12%
832
12%
2912
3%
832
24%
832
8%
2254

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%29%
49214
Night
18%10%46%5%34446%31%
49195
TransparencyDay
55%5%10%18%9%1
48901
Night
52%411%20%9%
49026
SeeingDay
24%14%29%19%8%2
5992
Night
24%11%30%24%8%
15207

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%15%6%9%7%45%43422%
1552
16th to endDay
11%13%6%9%7%35%5%35%26%
1664
February1st to 15thDay
10%17%410%8%46%445%23%
1635
16th to endDay
14%17%6%9%7%3433425%
1644
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%6%8%25%
2502
16th to endDay
13%6%35%6%35%6%6%8%34%
2345
September1st to 15thDay
18%6%25%6%34447%37%
2154
16th to endDay
18%5%25%424346%42%
1980
October1st to 15thDay
26%8%25%5%24446%29%
1857
16th to endDay
25%12%36%5%34446%22%
1731
November1st to 15thDay
19%12%47%5%34436%27%
1716
16th to endDay
21%14%46%42443428%
1566
December1st to 15thDay
23%16%5%6%434336%22%
1433
16th to endDay
21%15%48%6%4344423%
1664
January1st to 15thNight
18%15%6%8%5%2445%6%22%
2716
16th to endNight
12%13%6%9%7%35%5%45%25%
2912
February1st to 15thNight
9%12%6%9%8%45%446%27%
2550
16th to endNight
15%12%48%6%35%446%27%
1976
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%
1446
16th to endNight
14%5%24425%35%8%43%
1854
September1st to 15thNight
14%6%25%42436%7%41%
1806
16th to endNight
17%423423445%47%
1980
October1st to 15thNight
19%7%25%424346%39%
2100
16th to endNight
25%8%35%5%24347%28%
2493
November1st to 15thNight
21%8%36%5%3445%5%31%
2472
16th to endNight
22%12%47%5%24345%26%
2724
December1st to 15thNight
21%15%47%6%34345%23%
2839
16th to endNight
20%15%6%9%6%24345%21%
2912

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%15%6%
1553
16th to endDay
59%49%18%7%1
1664
February1st to 15thDay
63%39%15%6%
1637
16th to endDay
62%37%16%8%1
1644
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
2488
16th to endDay
43%7%16%23%9%
2345
September1st to 15thDay
45%5%14%23%10%
2154
16th to endDay
43%413%29%9%
1980
October1st to 15thDay
55%410%21%7%
1857
16th to endDay
60%5%12%16%4
1731
November1st to 15thDay
57%5%10%17%8%
1716
16th to endDay
59%49%19%7%
1566
December1st to 15thDay
64%311%16%3
1433
16th to endDay
63%47%14%10%
1664
January1st to 15thNight
62%310%16%6%
2716
16th to endNight
59%39%17%9%
2912
February1st to 15thNight
58%311%18%6%
2552
16th to endNight
57%39%15%11%1
1976
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%26%5%
1436
16th to endNight
38%5%18%29%8%
1854
September1st to 15thNight
41%417%26%10%
1806
16th to endNight
38%415%31%9%
1980
October1st to 15thNight
47%411%24%11%
2100
16th to endNight
54%412%21%6%
2493
November1st to 15thNight
53%5%12%19%8%1
2472
16th to endNight
59%310%19%6%
2724
December1st to 15thNight
62%412%16%4
2839
16th to endNight
65%38%13%8%
2912

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
33%11%34%14%6%
90
16th to endDay
22%16%37%17%5%
96
February1st to 15thDay
29%25%35%8%
123
16th to endDay
27%21%30%15%4
265
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%26%27%16%2
313
16th to endDay
15%9%28%25%14%7%
332
September1st to 15thDay
23%8%25%22%13%6%
315
16th to endDay
15%13%28%21%13%7%
314
October1st to 15thDay
27%13%26%19%10%3
315
16th to endDay
32%15%23%19%7%
289
November1st to 15thDay
25%16%27%18%10%1
280
16th to endDay
33%23%27%12%3
96
December1st to 15thDay
37%11%32%14%22
90
16th to endDay
31%25%30%11%2
96
January1st to 15thNight
27%12%36%19%4
780
16th to endNight
20%12%38%21%6%
832
February1st to 15thNight
16%13%39%25%5%
764
16th to endNight
23%14%33%22%5%
659
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
365
16th to endNight
17%5%26%32%16%1
708
September1st to 15thNight
18%5%30%30%13%1
720
16th to endNight
21%7%26%26%16%1
717
October1st to 15thNight
23%11%30%24%10%1
720
16th to endNight
32%10%31%18%6%
768
November1st to 15thNight
26%12%26%24%9%1
760
16th to endNight
30%15%26%19%7%1
780
December1st to 15thNight
31%13%30%19%5%
806
16th to endNight
31%13%32%17%41
832
Page generated at 2018-02-23 11:21:37. Version ac04

Copyright 2018 A. Danko


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