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 2024-11-04.

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	17% 11% 4 9% 6% 5% 5% 4 5% 7% 30%	101404
	Night	16% 11% 4 9% 5% 5% 5% 4 5% 6% 31%	97603
Transparency	Day	52% 5% 12% 20% 9% 1	104855
	Night	52% 5% 13% 20% 9% 1	102229
Seeing	Day	24% 17% 31% 19% 7% 2	14511
	Night	24% 12% 31% 25% 8% 1	23454

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% 17% 6% 13% 7% 5% 4 3 5% 5% 23%	2517
	11th to 20th	Day	9% 16% 7% 16% 9% 5% 3 3 3 3 26%	2520
	21st to end	Day	11% 12% 7% 14% 7% 5% 5% 4 5% 7% 23%	2772
February	1st to 10th	Day	10% 19% 5% 11% 9% 6% 4 2 4 6% 23%	1593
	11th to 20th	Day	11% 18% 4 11% 7% 5% 5% 3 5% 5% 26%	1767
	21st to end	Day	14% 18% 5% 11% 6% 4 5% 3 3 5% 26%	1570
March	1st to 10th	Day	17% 17% 4 11% 5% 5% 4 3 4 5% 26%	3116
	11th to 20th	Day	11% 17% 5% 12% 6% 5% 5% 3 4 6% 26%	3263
	21st to end	Day	12% 13% 4 9% 6% 5% 4 4 4 5% 35%	4166
April	1st to 10th	Day	21% 14% 4 8% 5% 4 4 3 4 4 28%	2280
	11th to 20th	Day	21% 9% 2 7% 5% 4 4 3 4 5% 35%	2274
	21st to end	Day	21% 11% 3 7% 5% 5% 4 4 5% 6% 29%	2470
May	1st to 10th	Day	21% 9% 3 8% 4 5% 4 3 5% 7% 31%	4377
	11th to 20th	Day	17% 6% 3 7% 5% 5% 5% 4 6% 10% 32%	4398
	21st to end	Day	17% 8% 3 8% 6% 6% 6% 4 6% 7% 30%	4837
June	1st to 10th	Day	21% 9% 3 8% 6% 5% 6% 4 6% 6% 27%	2660
	11th to 20th	Day	17% 8% 3 7% 6% 5% 5% 4 6% 7% 33%	2660
	21st to end	Day	22% 8% 3 9% 6% 5% 5% 5% 5% 7% 25%	2660
July	1st to 10th	Day	15% 7% 3 8% 6% 6% 5% 5% 7% 8% 30%	4440
	11th to 20th	Day	15% 6% 3 7% 6% 5% 6% 5% 8% 9% 31%	4440
	21st to end	Day	12% 6% 2 7% 5% 5% 5% 4 8% 8% 38%	4814
August	1st to 10th	Day	14% 7% 3 9% 6% 6% 6% 5% 8% 9% 29%	4423
	11th to 20th	Day	19% 7% 3 6% 5% 5% 5% 4 7% 8% 30%	4125
	21st to end	Day	17% 7% 3 7% 5% 5% 4 4 6% 7% 34%	4180
September	1st to 10th	Day	15% 6% 2 6% 5% 5% 5% 3 6% 8% 39%	2280
	11th to 20th	Day	15% 6% 2 6% 4 4 4 3 5% 7% 42%	2176
	21st to end	Day	21% 8% 3 7% 4 3 4 3 4 7% 38%	2090
October	1st to 10th	Day	23% 8% 3 7% 4 4 3 4 5% 6% 33%	1991
	11th to 20th	Day	22% 11% 4 8% 6% 5% 5% 4 4 7% 23%	1810
	21st to end	Day	26% 12% 2 8% 4 3 5% 3 4 6% 26%	1881
November	1st to 10th	Day	17% 14% 3 8% 5% 5% 4 3 4 5% 31%	1698
	11th to 20th	Day	19% 15% 4 9% 5% 4 4 4 4 6% 25%	1625
	21st to end	Day	20% 17% 4 9% 5% 4 5% 3 4 6% 23%	1520
December	1st to 10th	Day	23% 17% 4 9% 6% 4 4 3 4 6% 20%	1425
	11th to 20th	Day	21% 14% 5% 10% 4 5% 3 3 5% 4 24%	1814
	21st to end	Day	20% 18% 5% 12% 6% 4 4 3 4 4 22%	2772
January	1st to 10th	Night	14% 18% 6% 11% 6% 5% 5% 3 5% 6% 22%	4429
	11th to 20th	Night	10% 15% 6% 12% 7% 6% 5% 4 5% 6% 25%	4440
	21st to end	Night	10% 13% 6% 14% 9% 7% 5% 4 5% 5% 22%	4884
February	1st to 10th	Night	11% 14% 6% 9% 7% 6% 5% 3 5% 6% 28%	2584
	11th to 20th	Night	10% 15% 5% 12% 6% 6% 5% 4 5% 6% 27%	2297
	21st to end	Night	14% 13% 4 9% 7% 4 5% 4 4 7% 30%	1884
March	1st to 10th	Night	20% 14% 4 10% 6% 4 5% 3 5% 5% 25%	3724
	11th to 20th	Night	15% 19% 5% 11% 6% 5% 4 3 4 5% 25%	3692
	21st to end	Night	13% 10% 4 10% 6% 5% 5% 4 5% 5% 33%	3466
April	1st to 10th	Night	21% 13% 4 7% 5% 4 5% 3 4 5% 30%	1900
	11th to 20th	Night	19% 9% 3 6% 4 5% 4 3 6% 6% 35%	1854
	21st to end	Night	21% 12% 2 7% 4 3 3 2 5% 5% 35%	1710
May	1st to 10th	Night	20% 9% 3 6% 5% 5% 5% 3 5% 6% 31%	2592
	11th to 20th	Night	21% 7% 2 6% 3 4 4 4 5% 8% 37%	2495
	21st to end	Night	17% 7% 3 8% 6% 5% 5% 4 7% 7% 32%	2738
June	1st to 10th	Night	20% 7% 3 7% 3 4 4 4 5% 8% 35%	1520
	11th to 20th	Night	17% 7% 3 6% 5% 5% 4 5% 5% 7% 36%	1520
	21st to end	Night	19% 8% 3 6% 5% 5% 4 5% 6% 7% 32%	1520
July	1st to 10th	Night	13% 7% 2 7% 6% 5% 5% 5% 7% 8% 33%	2520
	11th to 20th	Night	15% 5% 2 6% 4 5% 5% 3 6% 8% 40%	2520
	21st to end	Night	11% 5% 2 5% 4 4 4 4 6% 7% 48%	2739
August	1st to 10th	Night	13% 6% 3 8% 4 5% 4 4 6% 9% 37%	2506
	11th to 20th	Night	16% 7% 2 7% 4 4 5% 4 5% 7% 37%	2668
	21st to end	Night	16% 7% 2 8% 5% 4 4 3 5% 8% 39%	3476
September	1st to 10th	Night	12% 7% 2 7% 4 4 4 4 5% 7% 44%	1900
	11th to 20th	Night	15% 6% 2 4 3 4 4 4 5% 6% 48%	2004
	21st to end	Night	17% 6% 2 6% 4 3 3 3 4 6% 44%	2090
October	1st to 10th	Night	19% 8% 3 7% 4 3 4 3 4 6% 40%	2185
	11th to 20th	Night	21% 10% 3 7% 5% 4 5% 3 4 7% 32%	2370
	21st to end	Night	23% 10% 3 8% 5% 4 5% 3 5% 7% 28%	2717
November	1st to 10th	Night	17% 11% 4 8% 5% 4 4 4 6% 6% 32%	2453
	11th to 20th	Night	19% 11% 4 8% 6% 5% 5% 4 6% 6% 27%	2555
	21st to end	Night	20% 17% 4 9% 4 5% 4 3 5% 6% 25%	2660
December	1st to 10th	Night	19% 15% 5% 11% 7% 4 4 4 5% 6% 20%	2743
	11th to 20th	Night	20% 16% 5% 10% 6% 5% 4 3 4 4 24%	3364
	21st to end	Night	21% 17% 5% 11% 5% 4 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	60% 5% 8% 14% 11% 2	3119
	11th to 20th	Day	58% 7% 8% 14% 11% 2	3263
	21st to end	Day	50% 4 8% 19% 15% 4	4166
April	1st to 10th	Day	58% 5% 9% 14% 12% 3	2280
	11th to 20th	Day	51% 4 8% 22% 12% 3	2274
	21st to end	Day	55% 5% 9% 16% 13% 3	2470
May	1st to 10th	Day	51% 6% 10% 18% 14% 2	4391
	11th to 20th	Day	45% 8% 17% 20% 9% 1	4402
	21st to end	Day	49% 8% 9% 17% 15% 2	4837
June	1st to 10th	Day	55% 7% 9% 18% 9% 2	2660
	11th to 20th	Day	47% 7% 13% 21% 10% 2	2660
	21st to end	Day	58% 6% 10% 15% 10% 1	2660
July	1st to 10th	Day	49% 5% 14% 24% 7%	4370
	11th to 20th	Day	47% 5% 19% 22% 6%	4365
	21st to end	Day	42% 6% 17% 27% 8%	4661
August	1st to 10th	Day	49% 6% 17% 21% 6%	4409
	11th to 20th	Day	50% 5% 19% 21% 5%	4167
	21st to end	Day	47% 5% 13% 20% 14%	4180
September	1st to 10th	Day	41% 7% 16% 25% 11% 1	2280
	11th to 20th	Day	40% 6% 14% 29% 10% 1	2176
	21st to end	Day	47% 5% 13% 26% 9%	2090
October	1st to 10th	Day	51% 4 11% 27% 6%	3303
	11th to 20th	Day	54% 4 14% 24% 4	2987
	21st to end	Day	50% 4 20% 19% 6% 1	3081
November	1st to 10th	Day	54% 6% 11% 19% 9% 1	1698
	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	61% 4 10% 13% 9% 3	3734
	11th to 20th	Night	61% 5% 7% 15% 10% 2	3693
	21st to end	Night	51% 5% 9% 21% 12% 3	3466
April	1st to 10th	Night	55% 4 8% 16% 15% 2	1900
	11th to 20th	Night	48% 4 9% 24% 13% 2	1854
	21st to end	Night	51% 4 8% 20% 15% 2	1710
May	1st to 10th	Night	52% 5% 13% 19% 8% 2	2598
	11th to 20th	Night	44% 7% 15% 20% 11% 2	2496
	21st to end	Night	47% 8% 11% 18% 14% 1	2739
June	1st to 10th	Night	47% 7% 12% 23% 10% 1	1520
	11th to 20th	Night	46% 8% 12% 19% 12% 3	1520
	21st to end	Night	49% 8% 12% 18% 13%	1520
July	1st to 10th	Night	46% 5% 21% 20% 8%	2480
	11th to 20th	Night	43% 4 21% 26% 5%	2472
	21st to end	Night	35% 5% 21% 28% 11%	2651
August	1st to 10th	Night	45% 5% 18% 23% 8%	2496
	11th to 20th	Night	46% 4 21% 22% 6%	2692
	21st to end	Night	46% 4 14% 25% 11%	3476
September	1st to 10th	Night	38% 6% 17% 26% 12% 1	1900
	11th to 20th	Night	35% 6% 18% 31% 10% 1	2004
	21st to end	Night	41% 5% 12% 30% 12%	2090
October	1st to 10th	Night	50% 3 12% 26% 9%	3640
	11th to 20th	Night	46% 4 15% 29% 7%	3932
	21st to end	Night	49% 3 17% 18% 11% 1	4467
November	1st to 10th	Night	52% 5% 13% 21% 7% 1	2453
	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	27% 24% 28% 14% 5% 2	506
April	1st to 10th	Day	31% 17% 30% 16% 6%	460
	11th to 20th	Day	29% 22% 26% 13% 7% 2	452
	21st to end	Day	30% 21% 33% 11% 4 1	460
May	1st to 10th	Day	29% 18% 33% 13% 6% 1	463
	11th to 20th	Day	20% 19% 34% 20% 6% 2	487
	21st to end	Day	24% 21% 34% 16% 5%	529
June	1st to 10th	Day	24% 14% 36% 20% 6%	490
	11th to 20th	Day	21% 18% 31% 21% 8% 1	490
	21st to end	Day	29% 12% 32% 20% 7%	490
July	1st to 10th	Day	15% 13% 38% 22% 10% 1	485
	11th to 20th	Day	14% 11% 39% 26% 8% 1	484
	21st to end	Day	14% 11% 32% 32% 9% 2	532
August	1st to 10th	Day	16% 11% 30% 28% 13% 1	486
	11th to 20th	Day	18% 7% 28% 29% 13% 4	479
	21st to end	Day	17% 14% 29% 23% 12% 5%	539
September	1st to 10th	Day	20% 15% 31% 20% 9% 5%	490
	11th to 20th	Day	17% 11% 28% 24% 14% 5%	490
	21st to end	Day	22% 15% 28% 18% 12% 4	490
October	1st to 10th	Day	25% 16% 28% 18% 10% 3	490
	11th to 20th	Day	28% 18% 28% 16% 8% 2	443
	21st to end	Day	34% 17% 27% 17% 5%	429
November	1st to 10th	Day	29% 18% 29% 18% 6% 1	374
	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% 33% 21% 7%	836
April	1st to 10th	Night	30% 14% 29% 20% 7%	760
	11th to 20th	Night	25% 15% 32% 21% 7%	730
	21st to end	Night	29% 16% 31% 19% 6%	570
May	1st to 10th	Night	28% 12% 31% 22% 7% 1	432
	11th to 20th	Night	23% 11% 30% 26% 9%	374
	21st to end	Night	22% 11% 36% 23% 8%	411
June	1st to 10th	Night	24% 9% 26% 34% 7%	380
	11th to 20th	Night	21% 8% 26% 34% 10% 1	380
	21st to end	Night	25% 4 26% 35% 10% 1	380
July	1st to 10th	Night	14% 6% 33% 37% 9%	370
	11th to 20th	Night	15% 4 26% 39% 15%	368
	21st to end	Night	16% 6% 25% 40% 14% 1	416
August	1st to 10th	Night	12% 3 25% 44% 16% 1	378
	11th to 20th	Night	17% 5% 23% 36% 17% 2	483
	21st to end	Night	20% 7% 26% 29% 16% 2	836
September	1st to 10th	Night	15% 8% 31% 34% 12% 1	760
	11th to 20th	Night	19% 8% 27% 27% 19% 2	760
	21st to end	Night	22% 8% 27% 27% 14% 1	760
October	1st to 10th	Night	23% 13% 27% 26% 11%	760
	11th to 20th	Night	28% 11% 30% 21% 8% 1	760
	21st to end	Night	31% 12% 31% 21% 5%	836
November	1st to 10th	Night	25% 14% 28% 26% 6% 1	755
	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 2024-11-01 22:47:48. Version ac07

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