Réserve Fauniques des Laurentides
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Réserve Fauniques des Laurentides clear sky chart from 2005-11-06 to 2024-04-10.

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 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% 13% 5% 9% 7% 4 5% 4 5% 6% 24%	82661
	Night	15% 14% 6% 10% 7% 4 5% 4 4 6% 24%	86126
Transparency	Day	57% 8% 10% 15% 8% 1	82365
	Night	57% 9% 10% 14% 8% 1	85957
Seeing	Day	26% 21% 30% 15% 6% 1	14470
	Night	23% 19% 30% 21% 6% 1	23093

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	9% 15% 8% 12% 12% 5% 6% 5% 4 7% 17%	2517
	11th to 20th	Day	8% 12% 7% 15% 13% 8% 5% 3 4 3 22%	2520
	21st to end	Day	7% 8% 7% 17% 7% 4 5% 6% 6% 6% 28%	2772
February	1st to 10th	Day	6% 12% 7% 15% 11% 5% 8% 5% 5% 6% 21%	1520
	11th to 20th	Day	8% 15% 7% 15% 10% 3 6% 4 3 7% 20%	1807
	21st to end	Day	9% 14% 7% 13% 10% 4 6% 5% 5% 5% 24%	1570
March	1st to 10th	Day	13% 18% 5% 11% 7% 3 4 3 4 5% 27%	3116
	11th to 20th	Day	11% 23% 7% 12% 8% 3 4 3 4 4 21%	3320
	21st to end	Day	10% 16% 6% 10% 7% 3 5% 3 4 5% 31%	4056
April	1st to 10th	Day	18% 18% 7% 9% 6% 3 4 3 4 5% 23%	2270
	11th to 20th	Day	18% 16% 5% 7% 4 2 5% 3 3 5% 32%	2230
	21st to end	Day	20% 15% 5% 8% 7% 3 4 4 4 4 26%	2340
May	1st to 10th	Day	21% 12% 4 6% 6% 3 4 4 4 6% 29%	2407
	11th to 20th	Day	19% 11% 4 8% 7% 4 4 5% 5% 6% 28%	2478
	21st to end	Day	24% 8% 3 7% 6% 3 5% 4 5% 6% 28%	2805
June	1st to 10th	Day	24% 10% 4 8% 6% 5% 5% 5% 6% 7% 22%	2700
	11th to 20th	Day	25% 9% 3 6% 6% 3 5% 4 4 7% 28%	2700
	21st to end	Day	27% 10% 4 8% 7% 3 4 4 5% 5% 23%	2700
July	1st to 10th	Day	20% 8% 4 7% 7% 4 6% 6% 6% 8% 23%	2619
	11th to 20th	Day	21% 9% 4 7% 6% 5% 6% 6% 6% 7% 22%	2520
	21st to end	Day	21% 9% 4 8% 7% 5% 7% 5% 6% 6% 23%	2744
August	1st to 10th	Day	23% 10% 4 8% 8% 5% 6% 6% 6% 6% 18%	2506
	11th to 20th	Day	20% 11% 4 8% 8% 3 5% 5% 6% 8% 22%	2304
	21st to end	Day	22% 9% 4 7% 7% 3 5% 6% 6% 7% 25%	2484
September	1st to 10th	Day	22% 10% 3 6% 4 3 4 5% 5% 5% 31%	2160
	11th to 20th	Day	20% 9% 3 5% 5% 2 5% 3 4 7% 36%	1999
	21st to end	Day	26% 11% 3 4 4 3 4 4 5% 6% 30%	1980
October	1st to 10th	Day	23% 14% 4 6% 5% 3 4 4 5% 6% 27%	1976
	11th to 20th	Day	24% 22% 5% 8% 5% 3 4 4 4 4 19%	1638
	21st to end	Day	24% 20% 5% 8% 5% 3 3 3 4 5% 19%	1782
November	1st to 10th	Day	17% 18% 8% 10% 6% 3 3 4 3 5% 22%	1671
	11th to 20th	Day	18% 18% 7% 13% 7% 3 3 3 4 5% 18%	1687
	21st to end	Day	14% 19% 9% 10% 9% 4 4 4 5% 5% 16%	1330
December	1st to 10th	Day	16% 18% 10% 12% 8% 3 5% 3 4 4 17%	1330
	11th to 20th	Day	14% 16% 9% 9% 10% 3 5% 4 4 5% 21%	1668
	21st to end	Day	17% 15% 6% 14% 5% 3 4 3 4 5% 24%	2435
January	1st to 10th	Night	8% 17% 9% 14% 10% 7% 4 5% 5% 5% 17%	4429
	11th to 20th	Night	8% 11% 7% 14% 12% 11% 6% 4 5% 5% 17%	4440
	21st to end	Night	6% 10% 6% 17% 9% 5% 6% 6% 6% 8% 22%	4884
February	1st to 10th	Night	8% 11% 7% 12% 10% 6% 7% 5% 6% 6% 23%	2660
	11th to 20th	Night	7% 16% 7% 16% 8% 4 7% 6% 5% 6% 19%	2257
	21st to end	Night	7% 16% 6% 12% 9% 4 7% 6% 5% 5% 23%	1884
March	1st to 10th	Night	13% 20% 6% 10% 6% 3 4 6% 4 5% 25%	3724
	11th to 20th	Night	12% 21% 8% 11% 9% 4 5% 5% 3 4 20%	3639
	21st to end	Night	12% 17% 5% 10% 6% 3 5% 4 4 6% 28%	3574
April	1st to 10th	Night	17% 17% 7% 10% 7% 3 4 4 3 4 24%	1900
	11th to 20th	Night	16% 14% 4 8% 5% 3 5% 5% 5% 6% 29%	1678
	21st to end	Night	18% 14% 5% 8% 6% 3 4 3 4 4 30%	1620
May	1st to 10th	Night	21% 11% 4 8% 6% 3 4 3 4 6% 30%	1568
	11th to 20th	Night	21% 9% 4 5% 6% 4 5% 5% 5% 6% 31%	1415
	21st to end	Night	23% 8% 3 5% 5% 3 4 4 4 7% 33%	1468
June	1st to 10th	Night	20% 11% 4 6% 5% 3 6% 6% 5% 7% 26%	1260
	11th to 20th	Night	21% 8% 3 6% 5% 2 4 4 4 8% 35%	1260
	21st to end	Night	21% 11% 5% 8% 6% 3 4 3 4 7% 28%	1260
July	1st to 10th	Night	18% 9% 4 6% 6% 3 5% 5% 4 9% 31%	1337
	11th to 20th	Night	19% 9% 3 6% 5% 4 4 6% 6% 8% 29%	1440
	21st to end	Night	18% 11% 3 6% 6% 3 5% 5% 5% 7% 32%	1574
August	1st to 10th	Night	16% 8% 3 5% 5% 3 4 6% 6% 9% 34%	1432
	11th to 20th	Night	20% 9% 3 7% 6% 3 5% 5% 5% 6% 30%	1579
	21st to end	Night	18% 9% 2 6% 6% 3 4 5% 5% 7% 34%	1871
September	1st to 10th	Night	20% 9% 2 6% 5% 3 4 3 4 7% 37%	1800
	11th to 20th	Night	21% 10% 3 5% 5% 4 5% 4 4 6% 33%	1960
	21st to end	Night	22% 10% 3 5% 5% 2 3 4 4 6% 36%	1980
October	1st to 10th	Night	17% 14% 5% 7% 6% 3 5% 4 4 5% 30%	1982
	11th to 20th	Night	26% 17% 4 7% 5% 3 4 3 4 5% 22%	2322
	21st to end	Night	23% 19% 5% 8% 6% 3 4 3 5% 4 20%	2574
November	1st to 10th	Night	17% 16% 8% 10% 6% 4 5% 4 5% 6% 20%	2407
	11th to 20th	Night	17% 15% 6% 12% 7% 4 5% 4 4 5% 20%	2489
	21st to end	Night	16% 17% 8% 13% 8% 4 5% 3 4 4 18%	2850
December	1st to 10th	Night	14% 18% 8% 14% 9% 5% 5% 3 4 5% 15%	2850
	11th to 20th	Night	17% 15% 6% 11% 12% 5% 5% 4 4 4 18%	3531
	21st to end	Night	16% 17% 8% 12% 7% 3 4 4 3 4 21%	5228

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	57% 15% 9% 14% 6%	2518
	11th to 20th	Day	63% 8% 6% 12% 10% 1	2520
	21st to end	Day	48% 12% 9% 15% 13% 3	2772
February	1st to 10th	Day	61% 6% 8% 13% 9% 3	1520
	11th to 20th	Day	63% 8% 8% 10% 10% 2	1816
	21st to end	Day	60% 6% 6% 15% 9% 3	1570
March	1st to 10th	Day	59% 7% 9% 12% 10% 4	3119
	11th to 20th	Day	61% 10% 10% 11% 8% 1	3320
	21st to end	Day	53% 8% 7% 16% 12% 5%	4056
April	1st to 10th	Day	62% 6% 10% 11% 8% 3	2270
	11th to 20th	Day	54% 6% 9% 18% 11% 3	2230
	21st to end	Day	60% 6% 8% 13% 11% 3	2340
May	1st to 10th	Day	55% 6% 11% 14% 12% 3	2407
	11th to 20th	Day	54% 9% 9% 19% 9% 1	2482
	21st to end	Day	54% 8% 9% 19% 10%	2805
June	1st to 10th	Day	58% 10% 9% 16% 5% 1	2700
	11th to 20th	Day	54% 8% 13% 15% 8% 1	2700
	21st to end	Day	62% 7% 10% 13% 8%	2700
July	1st to 10th	Day	54% 10% 14% 17% 5%	2548
	11th to 20th	Day	56% 10% 13% 15% 6%	2445
	21st to end	Day	56% 12% 12% 15% 5%	2591
August	1st to 10th	Day	61% 11% 13% 12% 3	2492
	11th to 20th	Day	55% 9% 16% 14% 5%	2304
	21st to end	Day	54% 9% 13% 17% 6%	2484
September	1st to 10th	Day	52% 7% 14% 18% 9%	2160
	11th to 20th	Day	45% 8% 16% 22% 8% 1	1999
	21st to end	Day	51% 9% 11% 18% 10%	1980
October	1st to 10th	Day	56% 7% 10% 18% 8% 1	1976
	11th to 20th	Day	67% 7% 11% 13% 3	1638
	21st to end	Day	66% 7% 9% 13% 5% 1	1782
November	1st to 10th	Day	62% 8% 9% 16% 6%	1671
	11th to 20th	Day	65% 7% 7% 14% 5% 1	1687
	21st to end	Day	65% 9% 9% 11% 5% 1	1330
December	1st to 10th	Day	69% 5% 9% 9% 7%	1330
	11th to 20th	Day	61% 7% 9% 11% 11% 1	1668
	21st to end	Day	57% 10% 8% 12% 9% 4	2435
January	1st to 10th	Night	65% 8% 7% 12% 7% 1	4429
	11th to 20th	Night	62% 12% 8% 11% 6% 2	4440
	21st to end	Night	53% 11% 8% 11% 12% 4	4884
February	1st to 10th	Night	56% 7% 7% 17% 12% 2	2660
	11th to 20th	Night	59% 9% 9% 10% 11% 1	2259
	21st to end	Night	57% 7% 9% 13% 12% 3	1884
March	1st to 10th	Night	57% 8% 9% 14% 9% 3	3734
	11th to 20th	Night	63% 10% 9% 11% 6% 1	3640
	21st to end	Night	54% 8% 9% 18% 9% 2	3574
April	1st to 10th	Night	61% 8% 6% 12% 10% 3	1900
	11th to 20th	Night	50% 9% 10% 18% 12% 2	1678
	21st to end	Night	55% 8% 8% 16% 11% 2	1620
May	1st to 10th	Night	55% 6% 10% 14% 12% 3	1568
	11th to 20th	Night	50% 9% 11% 18% 11% 1	1416
	21st to end	Night	49% 8% 13% 18% 11% 1	1469
June	1st to 10th	Night	52% 9% 13% 18% 7% 1	1260
	11th to 20th	Night	47% 9% 12% 20% 10% 3	1260
	21st to end	Night	56% 7% 12% 16% 9%	1260
July	1st to 10th	Night	46% 11% 19% 19% 6%	1298
	11th to 20th	Night	49% 11% 15% 17% 7%	1392
	21st to end	Night	47% 12% 15% 19% 6%	1486
August	1st to 10th	Night	43% 11% 20% 20% 5%	1422
	11th to 20th	Night	50% 12% 17% 17% 5%	1579
	21st to end	Night	45% 9% 15% 26% 4	1871
September	1st to 10th	Night	46% 9% 14% 21% 10% 1	1800
	11th to 20th	Night	48% 9% 15% 21% 6% 1	1960
	21st to end	Night	48% 7% 12% 23% 9% 1	1980
October	1st to 10th	Night	52% 7% 11% 19% 10% 1	1982
	11th to 20th	Night	60% 9% 12% 13% 6%	2322
	21st to end	Night	64% 7% 10% 12% 6% 1	2574
November	1st to 10th	Night	57% 11% 12% 15% 5%	2407
	11th to 20th	Night	59% 10% 10% 11% 9% 1	2489
	21st to end	Night	64% 9% 9% 12% 6% 1	2850
December	1st to 10th	Night	69% 7% 7% 10% 6% 1	2850
	11th to 20th	Night	63% 9% 6% 10% 11% 1	3532
	21st to end	Night	62% 9% 7% 10% 9% 2	5228

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	21% 25% 38% 13% 2	180
	11th to 20th	Day	26% 24% 34% 12% 3	180
	21st to end	Day	14% 26% 40% 13% 6% 2	198
February	1st to 10th	Day	26% 34% 32% 6% 2	180
	11th to 20th	Day	22% 31% 31% 12% 3	431
	21st to end	Day	26% 29% 29% 12% 3	382
March	1st to 10th	Day	23% 26% 36% 11% 4	460
	11th to 20th	Day	26% 27% 27% 15% 4	460
	21st to end	Day	26% 28% 26% 13% 6% 1	506
April	1st to 10th	Day	32% 24% 26% 14% 3	457
	11th to 20th	Day	30% 23% 29% 11% 5% 1	412
	21st to end	Day	28% 23% 36% 8% 4 1	420
May	1st to 10th	Day	28% 20% 33% 13% 5% 1	423
	11th to 20th	Day	23% 22% 34% 17% 3 1	447
	21st to end	Day	28% 22% 28% 15% 6% 1	565
June	1st to 10th	Day	27% 20% 31% 16% 6%	630
	11th to 20th	Day	27% 21% 26% 17% 8% 1	630
	21st to end	Day	27% 15% 30% 21% 6%	630
July	1st to 10th	Day	21% 15% 35% 21% 8%	543
	11th to 20th	Day	23% 17% 37% 16% 7% 1	444
	21st to end	Day	22% 16% 36% 20% 6% 1	488
August	1st to 10th	Day	22% 15% 33% 18% 10% 1	446
	11th to 20th	Day	20% 13% 33% 24% 8% 2	439
	21st to end	Day	25% 19% 27% 14% 12% 3	495
September	1st to 10th	Day	24% 20% 27% 18% 8% 3	450
	11th to 20th	Day	25% 15% 31% 18% 9% 3	450
	21st to end	Day	28% 19% 25% 17% 7% 5%	450
October	1st to 10th	Day	25% 22% 28% 17% 6% 2	450
	11th to 20th	Day	33% 21% 27% 11% 7% 1	369
	21st to end	Day	37% 23% 27% 10% 3	396
November	1st to 10th	Day	33% 24% 25% 14% 4	365
	11th to 20th	Day	29% 19% 29% 15% 7% 1	356
	21st to end	Day	26% 32% 32% 8% 2 1	180
December	1st to 10th	Day	27% 19% 31% 17% 5% 1	180
	11th to 20th	Day	31% 27% 29% 9% 3 1	180
	21st to end	Day	29% 29% 25% 11% 5% 1	198
January	1st to 10th	Night	18% 24% 37% 17% 4	760
	11th to 20th	Night	21% 27% 30% 18% 5%	760
	21st to end	Night	15% 18% 39% 22% 5% 1	836
February	1st to 10th	Night	14% 25% 38% 18% 4	760
	11th to 20th	Night	18% 26% 37% 14% 4 1	743
	21st to end	Night	19% 23% 39% 16% 4	628
March	1st to 10th	Night	18% 24% 37% 19% 3	760
	11th to 20th	Night	21% 27% 31% 15% 5% 1	760
	21st to end	Night	20% 25% 32% 17% 6%	836
April	1st to 10th	Night	28% 20% 31% 17% 4	760
	11th to 20th	Night	24% 20% 31% 20% 5%	614
	21st to end	Night	27% 20% 28% 21% 4 1	540
May	1st to 10th	Night	29% 14% 27% 23% 6%	488
	11th to 20th	Night	24% 12% 31% 25% 8%	354
	21st to end	Night	28% 13% 30% 23% 5% 1	389
June	1st to 10th	Night	24% 10% 28% 28% 9%	360
	11th to 20th	Night	22% 11% 24% 31% 11% 1	360
	21st to end	Night	25% 11% 27% 28% 9%	360
July	1st to 10th	Night	19% 11% 31% 29% 9% 1	350
	11th to 20th	Night	22% 8% 25% 33% 11% 1	348
	21st to end	Night	21% 9% 22% 35% 12% 1	394
August	1st to 10th	Night	19% 7% 22% 37% 15% 1	358
	11th to 20th	Night	23% 10% 25% 28% 14% 1	515
	21st to end	Night	22% 13% 24% 29% 11% 1	683
September	1st to 10th	Night	23% 11% 28% 26% 11% 1	720
	11th to 20th	Night	24% 14% 28% 22% 11% 2	720
	21st to end	Night	26% 17% 23% 23% 10% 1	720
October	1st to 10th	Night	26% 17% 25% 25% 6% 1	720
	11th to 20th	Night	33% 15% 26% 17% 8% 1	720
	21st to end	Night	33% 19% 28% 15% 5%	792
November	1st to 10th	Night	28% 21% 29% 18% 4 1	740
	11th to 20th	Night	26% 25% 24% 17% 7% 1	764
	21st to end	Night	25% 26% 29% 15% 4 1	850
December	1st to 10th	Night	24% 23% 28% 19% 6% 1	850
	11th to 20th	Night	24% 25% 28% 18% 5%	850
	21st to end	Night	25% 25% 28% 17% 4 1	931

Page generated at 2024-04-07 09:28:15. Version ac07

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