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 2005-11-06 to 2024-03-28.

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 Type	Minimum conditions for hour to be usable				Out of hours
	Clear of Clouds	Transparency	Seeing	Sky Brightness
Planetary:	50%	(no limit)	Average	(no limit)	Nighttime Hours
Deep Sky:	70%	Average	(no limit)	5.9	Nighttime Hours
CCD Imaging:	70%	Below Average	Poor	(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

By Month

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 Forecast	Data Points
Cloud Cover	Day	18% 10% 4 8% 7% 4 5% 5% 5% 6% 29%	78385
	Night	16% 11% 4 8% 6% 3 5% 4 5% 6% 31%	81580
Transparency	Day	54% 6% 11% 19% 10% 1	78091
	Night	53% 5% 11% 20% 9% 1	81409
Seeing	Day	24% 17% 31% 18% 7% 2	13646
	Night	24% 12% 31% 25% 8% 1	22795

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
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	13% 16% 6% 12% 8% 4 4 4 5% 5% 23%	2517
	11th to 20th	Day	9% 16% 7% 13% 11% 4 4 3 3 3 26%	2520
	21st to end	Day	11% 12% 7% 12% 8% 4 6% 5% 5% 7% 24%	2772
February	1st to 10th	Day	10% 18% 5% 10% 10% 5% 5% 3 4 5% 23%	1593
	11th to 20th	Day	11% 17% 5% 10% 7% 4 5% 4 4 5% 26%	1767
	21st to end	Day	14% 16% 6% 10% 8% 3 5% 4 3 5% 26%	1570
March	1st to 10th	Day	13% 13% 4 10% 7% 4 5% 4 4 6% 29%	1897
	11th to 20th	Day	15% 14% 5% 8% 6% 4 5% 4 5% 6% 29%	1951
	21st to end	Day	16% 12% 4 8% 7% 4 5% 5% 3 5% 31%	2460
April	1st to 10th	Day	22% 12% 4 8% 6% 3 4 4 4 5% 27%	2160
	11th to 20th	Day	21% 8% 3 6% 6% 3 4 4 4 5% 36%	2152
	21st to end	Day	21% 10% 4 7% 5% 4 4 5% 4 5% 30%	2340
May	1st to 10th	Day	22% 8% 4 7% 5% 3 5% 3 4 6% 33%	2485
	11th to 20th	Day	19% 7% 3 7% 6% 4 5% 4 5% 7% 33%	2478
	21st to end	Day	20% 8% 3 6% 6% 4 6% 5% 5% 8% 31%	2725
June	1st to 10th	Day	22% 7% 4 6% 7% 4 6% 5% 6% 6% 27%	2520
	11th to 20th	Day	18% 7% 3 6% 7% 3 5% 5% 5% 7% 33%	2520
	21st to end	Day	22% 8% 3 8% 7% 3 6% 6% 5% 7% 25%	2520
July	1st to 10th	Day	16% 5% 3 6% 7% 4 6% 5% 7% 8% 32%	2520
	11th to 20th	Day	15% 6% 3 6% 7% 4 6% 6% 8% 9% 30%	2520
	21st to end	Day	13% 7% 3 7% 7% 5% 6% 6% 8% 9% 30%	2744
August	1st to 10th	Day	15% 8% 3 7% 7% 5% 7% 6% 7% 9% 26%	2506
	11th to 20th	Day	16% 6% 3 5% 6% 4 6% 6% 7% 8% 32%	2359
	21st to end	Day	14% 7% 3 6% 6% 4 5% 6% 7% 8% 34%	2376
September	1st to 10th	Day	15% 6% 2 5% 6% 4 5% 5% 6% 8% 39%	2160
	11th to 20th	Day	16% 6% 3 5% 5% 3 5% 5% 5% 7% 41%	2062
	21st to end	Day	21% 7% 3 6% 4 2 4 4 4 7% 39%	1980
October	1st to 10th	Day	24% 8% 3 6% 5% 3 3 4 5% 6% 33%	1887
	11th to 20th	Day	23% 10% 4 8% 7% 4 6% 5% 4 7% 23%	1715
	21st to end	Day	27% 12% 2 6% 6% 2 5% 4 4 6% 25%	1782
November	1st to 10th	Day	18% 13% 4 7% 7% 4 5% 4 4 5% 30%	1671
	11th to 20th	Day	20% 14% 5% 8% 6% 3 4 5% 4 6% 25%	1625
	21st to end	Day	20% 16% 5% 8% 6% 3 5% 4 4 6% 23%	1520
December	1st to 10th	Day	23% 16% 5% 9% 6% 3 4 4 4 6% 21%	1425
	11th to 20th	Day	22% 13% 5% 9% 5% 4 4 4 5% 4 24%	1814
	21st to end	Day	20% 18% 5% 10% 7% 3 4 4 4 4 22%	2772
January	1st to 10th	Night	14% 16% 6% 10% 7% 4 5% 4 5% 6% 22%	4429
	11th to 20th	Night	10% 14% 6% 11% 8% 4 6% 5% 5% 6% 25%	4440
	21st to end	Night	10% 12% 6% 12% 11% 6% 6% 5% 5% 5% 23%	4884
February	1st to 10th	Night	11% 13% 6% 8% 7% 4 6% 4 5% 6% 28%	2584
	11th to 20th	Night	10% 14% 5% 11% 7% 4 6% 5% 4 6% 27%	2297
	21st to end	Night	14% 13% 4 8% 8% 3 6% 4 4 6% 30%	1884
March	1st to 10th	Night	14% 13% 5% 10% 8% 3 5% 4 5% 7% 27%	2270
	11th to 20th	Night	16% 14% 5% 8% 6% 3 6% 4 4 5% 29%	2224
	21st to end	Night	15% 11% 4 7% 6% 4 5% 5% 5% 5% 35%	2051
April	1st to 10th	Night	22% 11% 5% 7% 6% 3 5% 4 4 5% 29%	1800
	11th to 20th	Night	17% 8% 3 5% 5% 3 5% 4 6% 7% 37%	1756
	21st to end	Night	22% 11% 3 6% 5% 2 3 3 5% 6% 34%	1620
May	1st to 10th	Night	22% 8% 4 5% 4 3 5% 4 3 6% 36%	1490
	11th to 20th	Night	20% 7% 2 6% 4 3 4 5% 4 8% 38%	1415
	21st to end	Night	18% 7% 3 5% 5% 3 5% 4 5% 6% 39%	1550
June	1st to 10th	Night	21% 6% 3 6% 4 3 4 5% 5% 8% 35%	1440
	11th to 20th	Night	18% 6% 4 6% 6% 3 4 6% 5% 7% 35%	1440
	21st to end	Night	18% 7% 3 5% 6% 4 5% 6% 6% 7% 32%	1440
July	1st to 10th	Night	13% 6% 3 5% 5% 3 5% 5% 7% 9% 38%	1440
	11th to 20th	Night	12% 6% 3 6% 5% 4 6% 4 6% 8% 40%	1440
	21st to end	Night	13% 6% 3 4 6% 3 6% 5% 7% 7% 40%	1574
August	1st to 10th	Night	12% 5% 2 5% 5% 3 5% 5% 7% 11% 41%	1432
	11th to 20th	Night	15% 5% 2 6% 6% 4 5% 6% 6% 8% 39%	1520
	21st to end	Night	16% 6% 2 5% 4 2 5% 4 5% 9% 43%	1980
September	1st to 10th	Night	12% 7% 2 6% 5% 3 5% 4 6% 7% 44%	1800
	11th to 20th	Night	16% 6% 2 4 4 3 3 4 5% 6% 47%	1898
	21st to end	Night	18% 6% 2 5% 5% 2 3 4 4 6% 45%	1980
October	1st to 10th	Night	19% 7% 3 6% 5% 2 3 4 4 6% 41%	2070
	11th to 20th	Night	22% 9% 3 6% 5% 3 4 4 4 7% 31%	2245
	21st to end	Night	24% 9% 3 7% 6% 3 5% 4 5% 7% 27%	2574
November	1st to 10th	Night	18% 10% 4 8% 6% 3 4 5% 5% 6% 31%	2407
	11th to 20th	Night	19% 10% 4 7% 6% 3 6% 5% 6% 6% 27%	2555
	21st to end	Night	20% 15% 5% 8% 5% 4 4 4 5% 6% 25%	2660
December	1st to 10th	Night	20% 14% 5% 10% 8% 3 5% 4 4 6% 21%	2743
	11th to 20th	Night	20% 15% 5% 9% 7% 4 4 4 4 5% 24%	3364
	21st to end	Night	21% 17% 5% 9% 7% 3 4 3 4 5% 21%	4884

Transparency (when cloud cover <= 30%)
Color Meanings: Too cloudy to forecast Poor Below Average Average Above average Transparent
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	60% 7% 11% 17% 5%	2518
	11th to 20th	Day	61% 6% 7% 18% 7% 1	2520
	21st to end	Day	59% 6% 9% 19% 7% 1	2772
February	1st to 10th	Day	63% 3 7% 16% 9% 2	1593
	11th to 20th	Day	60% 4 10% 15% 11% 1	1776
	21st to end	Day	61% 4 8% 15% 8% 4	1570
March	1st to 10th	Day	56% 5% 8% 17% 12% 2	1900
	11th to 20th	Day	56% 5% 9% 15% 12% 3	1951
	21st to end	Day	55% 4 7% 17% 13% 3	2460
April	1st to 10th	Day	59% 4 9% 13% 11% 3	2160
	11th to 20th	Day	50% 4 9% 22% 12% 3	2152
	21st to end	Day	56% 4 9% 16% 13% 3	2340
May	1st to 10th	Day	52% 4 8% 19% 14% 2	2485
	11th to 20th	Day	50% 6% 9% 19% 15% 2	2482
	21st to end	Day	52% 6% 9% 17% 14% 2	2725
June	1st to 10th	Day	55% 7% 9% 18% 9% 2	2520
	11th to 20th	Day	48% 7% 11% 21% 10% 2	2520
	21st to end	Day	58% 6% 10% 15% 10% 1	2520
July	1st to 10th	Day	46% 7% 15% 23% 9%	2450
	11th to 20th	Day	46% 8% 14% 22% 9%	2445
	21st to end	Day	49% 9% 15% 20% 7%	2591
August	1st to 10th	Day	51% 9% 16% 19% 5%	2492
	11th to 20th	Day	46% 8% 15% 21% 9%	2359
	21st to end	Day	43% 8% 13% 23% 11%	2376
September	1st to 10th	Day	41% 7% 16% 24% 12% 1	2160
	11th to 20th	Day	42% 6% 14% 28% 10% 1	2062
	21st to end	Day	46% 5% 13% 27% 9%	1980
October	1st to 10th	Day	52% 5% 11% 22% 9% 1	1887
	11th to 20th	Day	60% 7% 12% 19% 3	1715
	21st to end	Day	60% 5% 11% 16% 7% 1	1782
November	1st to 10th	Day	55% 6% 11% 19% 9% 1	1671
	11th to 20th	Day	59% 5% 10% 16% 9%	1625
	21st to end	Day	62% 5% 10% 16% 6%	1520
December	1st to 10th	Day	66% 4 10% 16% 5%	1425
	11th to 20th	Day	60% 5% 7% 19% 8%	1815
	21st to end	Day	66% 4 8% 14% 8%	2772
January	1st to 10th	Night	62% 5% 12% 15% 5%	4429
	11th to 20th	Night	58% 5% 11% 19% 5% 1	4440
	21st to end	Night	61% 7% 9% 14% 9% 1	4884
February	1st to 10th	Night	56% 5% 10% 18% 9% 1	2584
	11th to 20th	Night	58% 4 10% 17% 10% 1	2299
	21st to end	Night	55% 4 9% 17% 14% 2	1884
March	1st to 10th	Night	58% 4 8% 16% 11% 2	2280
	11th to 20th	Night	57% 4 8% 15% 12% 3	2225
	21st to end	Night	50% 4 8% 21% 13% 3	2051
April	1st to 10th	Night	56% 5% 9% 15% 14% 2	1800
	11th to 20th	Night	46% 4 10% 24% 14% 2	1756
	21st to end	Night	52% 3 8% 20% 14% 2	1620
May	1st to 10th	Night	51% 4 9% 17% 15% 3	1490
	11th to 20th	Night	46% 5% 13% 19% 14% 3	1416
	21st to end	Night	45% 7% 12% 19% 15% 2	1551
June	1st to 10th	Night	47% 7% 12% 22% 10% 1	1440
	11th to 20th	Night	47% 8% 11% 19% 12% 4	1440
	21st to end	Night	48% 8% 13% 18% 12%	1440
July	1st to 10th	Night	40% 7% 20% 22% 11% 1	1400
	11th to 20th	Night	42% 6% 17% 26% 9% 1	1392
	21st to end	Night	41% 8% 17% 25% 9%	1486
August	1st to 10th	Night	38% 8% 20% 28% 7%	1422
	11th to 20th	Night	42% 6% 18% 25% 9%	1520
	21st to end	Night	39% 5% 17% 29% 10%	1980
September	1st to 10th	Night	39% 6% 18% 25% 12% 1	1800
	11th to 20th	Night	37% 6% 17% 30% 9% 1	1898
	21st to end	Night	41% 5% 12% 30% 12%	1980
October	1st to 10th	Night	47% 4 10% 26% 13%	2070
	11th to 20th	Night	52% 6% 13% 22% 7%	2245
	21st to end	Night	56% 5% 12% 18% 8% 1	2574
November	1st to 10th	Night	53% 5% 13% 21% 8% 1	2407
	11th to 20th	Night	55% 6% 11% 18% 8% 1	2555
	21st to end	Night	59% 5% 11% 17% 7%	2660
December	1st to 10th	Night	64% 5% 11% 15% 5%	2743
	11th to 20th	Night	62% 6% 7% 16% 8% 1	3364
	21st to end	Night	65% 4 8% 16% 6% 1	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
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	24% 17% 39% 16% 3 1	180
	11th to 20th	Day	27% 16% 38% 13% 7%	180
	21st to end	Day	19% 19% 38% 18% 6%	198
February	1st to 10th	Day	27% 30% 36% 6% 1	215
	11th to 20th	Day	23% 29% 35% 11% 1	375
	21st to end	Day	28% 25% 31% 12% 4	382
March	1st to 10th	Day	25% 20% 35% 17% 4	460
	11th to 20th	Day	26% 23% 32% 14% 4 1	460
	21st to end	Day	28% 23% 27% 15% 5% 2	490
April	1st to 10th	Day	30% 17% 29% 16% 6%	420
	11th to 20th	Day	28% 22% 26% 14% 7% 2	412
	21st to end	Day	30% 20% 33% 11% 4 1	420
May	1st to 10th	Day	28% 18% 34% 13% 6% 1	423
	11th to 20th	Day	21% 20% 34% 18% 6% 2	447
	21st to end	Day	24% 21% 34% 16% 5%	485
June	1st to 10th	Day	25% 15% 36% 18% 6%	450
	11th to 20th	Day	22% 18% 30% 21% 9% 1	450
	21st to end	Day	27% 12% 32% 21% 8%	450
July	1st to 10th	Day	16% 13% 38% 23% 10% 2	445
	11th to 20th	Day	14% 11% 39% 26% 8% 1	444
	21st to end	Day	15% 11% 30% 33% 9% 2	488
August	1st to 10th	Day	17% 11% 28% 29% 13% 2	446
	11th to 20th	Day	17% 7% 29% 29% 13% 5%	439
	21st to end	Day	17% 15% 29% 22% 11% 6%	495
September	1st to 10th	Day	19% 15% 31% 20% 10% 5%	450
	11th to 20th	Day	19% 12% 30% 21% 12% 5%	450
	21st to end	Day	22% 16% 29% 17% 12% 4	450
October	1st to 10th	Day	25% 16% 29% 18% 10% 2	450
	11th to 20th	Day	27% 19% 27% 17% 8% 2	408
	21st to end	Day	35% 17% 26% 17% 5%	396
November	1st to 10th	Day	29% 18% 28% 18% 6% 1	365
	11th to 20th	Day	32% 18% 29% 15% 5%	285
	21st to end	Day	26% 24% 31% 17% 2	180
December	1st to 10th	Day	33% 15% 28% 17% 6% 1	180
	11th to 20th	Day	33% 22% 29% 13% 2	180
	21st to end	Day	33% 23% 27% 14% 2 2	198
January	1st to 10th	Night	26% 14% 36% 19% 4	760
	11th to 20th	Night	27% 16% 34% 17% 6%	760
	21st to end	Night	15% 12% 42% 26% 5%	836
February	1st to 10th	Night	19% 15% 36% 25% 4	760
	11th to 20th	Night	20% 18% 38% 20% 4	743
	21st to end	Night	21% 17% 34% 24% 4	628
March	1st to 10th	Night	23% 16% 35% 22% 4	760
	11th to 20th	Night	25% 18% 31% 19% 6% 1	760
	21st to end	Night	23% 16% 32% 22% 7%	821
April	1st to 10th	Night	30% 14% 28% 20% 7%	720
	11th to 20th	Night	24% 14% 32% 22% 7%	692
	21st to end	Night	29% 15% 31% 19% 6%	540
May	1st to 10th	Night	27% 13% 30% 23% 7% 1	410
	11th to 20th	Night	24% 12% 29% 27% 9%	354
	21st to end	Night	22% 10% 36% 23% 8%	389
June	1st to 10th	Night	25% 8% 27% 33% 7%	360
	11th to 20th	Night	21% 9% 24% 34% 10% 1	360
	21st to end	Night	23% 4 25% 36% 11% 1	360
July	1st to 10th	Night	14% 6% 33% 36% 10%	350
	11th to 20th	Night	15% 4 26% 38% 16%	348
	21st to end	Night	16% 6% 25% 39% 13% 1	394
August	1st to 10th	Night	13% 3 24% 44% 16% 1	358
	11th to 20th	Night	16% 5% 24% 38% 16% 1	456
	21st to end	Night	19% 7% 26% 29% 16% 2	792
September	1st to 10th	Night	15% 8% 31% 34% 12% 1	720
	11th to 20th	Night	19% 8% 28% 26% 17% 2	720
	21st to end	Night	22% 9% 28% 27% 13% 1	720
October	1st to 10th	Night	23% 13% 27% 27% 11%	720
	11th to 20th	Night	28% 11% 31% 21% 8% 1	720
	21st to end	Night	31% 11% 31% 21% 6%	792
November	1st to 10th	Night	25% 14% 27% 26% 7% 1	740
	11th to 20th	Night	25% 15% 31% 20% 8% 1	760
	21st to end	Night	30% 18% 25% 21% 5% 1	760
December	1st to 10th	Night	29% 13% 31% 21% 7%	800
	11th to 20th	Night	29% 16% 32% 18% 5% 1	796
	21st to end	Night	32% 15% 30% 18% 4 1	836

Page generated at 2024-03-24 23:37:02. Version ac07

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