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 2024-11-04.

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	18% 13% 4 10% 6% 5% 5% 4 5% 6% 25%	101467
	Night	15% 14% 5% 11% 6% 5% 4 4 5% 6% 25%	97562
Transparency	Day	56% 9% 11% 15% 8% 1	104926
	Night	56% 9% 11% 15% 8% 1	102193
Seeing	Day	26% 21% 30% 15% 6% 1	15318
	Night	23% 19% 29% 21% 7% 1	23694

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% 16% 7% 14% 11% 6% 5% 4 5% 6% 17%	2517
	11th to 20th	Day	8% 12% 7% 18% 10% 11% 3 2 4 3 22%	2520
	21st to end	Day	7% 9% 6% 18% 5% 6% 5% 5% 6% 6% 28%	2772
February	1st to 10th	Day	6% 14% 5% 16% 10% 7% 7% 4 5% 6% 21%	1520
	11th to 20th	Day	8% 16% 6% 17% 9% 5% 6% 4 4 7% 19%	1807
	21st to end	Day	9% 14% 7% 15% 8% 5% 6% 3 5% 4 24%	1570
March	1st to 10th	Day	13% 19% 5% 12% 5% 4 4 2 4 5% 27%	3116
	11th to 20th	Day	11% 24% 7% 14% 6% 4 3 3 4 4 21%	3320
	21st to end	Day	10% 17% 6% 11% 6% 5% 4 3 4 5% 31%	4056
April	1st to 10th	Day	18% 20% 5% 10% 5% 4 3 3 4 5% 23%	2280
	11th to 20th	Day	17% 17% 5% 8% 4 4 4 3 3 5% 31%	2356
	21st to end	Day	19% 16% 5% 9% 5% 4 4 3 4 4 26%	2470
May	1st to 10th	Day	20% 13% 4 8% 6% 5% 5% 4 4 6% 26%	4229
	11th to 20th	Day	18% 12% 3 8% 6% 5% 5% 5% 6% 8% 25%	4398
	21st to end	Day	21% 10% 3 8% 6% 5% 5% 4 6% 7% 26%	4987
June	1st to 10th	Day	23% 11% 3 8% 6% 6% 5% 4 6% 7% 22%	2850
	11th to 20th	Day	23% 10% 3 7% 5% 5% 5% 4 5% 7% 28%	2850
	21st to end	Day	27% 10% 4 9% 6% 4 4 3 5% 5% 22%	2850
July	1st to 10th	Day	20% 10% 4 9% 6% 6% 5% 5% 6% 6% 23%	4609
	11th to 20th	Day	21% 9% 3 8% 6% 6% 6% 5% 6% 7% 22%	4440
	21st to end	Day	18% 7% 3 7% 5% 6% 6% 4 7% 6% 31%	4814
August	1st to 10th	Day	19% 8% 3 9% 6% 6% 6% 5% 7% 7% 23%	4410
	11th to 20th	Day	23% 11% 3 9% 7% 6% 6% 4 6% 6% 19%	4045
	21st to end	Day	21% 9% 3 8% 5% 4 4 4 6% 7% 28%	4358
September	1st to 10th	Day	21% 11% 3 7% 3 5% 4 4 5% 5% 31%	2280
	11th to 20th	Day	19% 9% 2 6% 5% 3 5% 2 4 7% 37%	2110
	21st to end	Day	25% 11% 3 6% 3 4 4 3 5% 5% 30%	2090
October	1st to 10th	Day	22% 15% 4 7% 4 4 4 3 5% 5% 26%	2085
	11th to 20th	Day	23% 23% 4 8% 4 4 4 3 4 4 19%	1729
	21st to end	Day	23% 21% 5% 9% 3 4 2 2 4 6% 20%	1881
November	1st to 10th	Day	17% 20% 7% 11% 5% 3 4 3 3 5% 23%	1698
	11th to 20th	Day	17% 20% 6% 15% 6% 4 4 2 4 5% 18%	1687
	21st to end	Day	14% 21% 8% 11% 8% 5% 3 4 5% 5% 16%	1330
December	1st to 10th	Day	16% 20% 8% 13% 8% 4 4 2 4 4 17%	1330
	11th to 20th	Day	13% 18% 8% 10% 9% 4 4 4 4 4 21%	1668
	21st to end	Day	17% 16% 6% 15% 4 4 3 3 4 5% 23%	2435
January	1st to 10th	Night	8% 18% 8% 16% 8% 8% 4 4 5% 5% 17%	4429
	11th to 20th	Night	8% 12% 7% 17% 10% 13% 5% 3 5% 5% 16%	4440
	21st to end	Night	6% 11% 5% 19% 7% 6% 6% 5% 6% 8% 22%	4884
February	1st to 10th	Night	7% 12% 6% 14% 8% 8% 6% 4 6% 6% 22%	2660
	11th to 20th	Night	7% 17% 7% 17% 6% 6% 6% 5% 5% 6% 19%	2257
	21st to end	Night	7% 16% 6% 13% 8% 5% 7% 4 6% 5% 22%	1884
March	1st to 10th	Night	12% 20% 5% 11% 5% 4 3 6% 4 5% 24%	3724
	11th to 20th	Night	11% 22% 7% 13% 7% 5% 5% 3 4 4 19%	3639
	21st to end	Night	12% 18% 5% 11% 5% 5% 4 3 4 5% 28%	3574
April	1st to 10th	Night	16% 19% 6% 11% 7% 4 4 3 3 4 23%	1900
	11th to 20th	Night	16% 16% 3 9% 4 4 4 4 5% 6% 27%	1772
	21st to end	Night	17% 15% 5% 9% 5% 4 4 3 4 5% 30%	1710
May	1st to 10th	Night	19% 10% 3 8% 4 4 4 3 5% 7% 33%	2740
	11th to 20th	Night	19% 11% 3 7% 4 4 5% 3 5% 6% 34%	2495
	21st to end	Night	21% 8% 2 6% 4 4 5% 4 5% 9% 31%	2591
June	1st to 10th	Night	19% 12% 3 7% 5% 5% 5% 5% 5% 7% 27%	1330
	11th to 20th	Night	21% 9% 2 7% 5% 3 4 3 4 8% 34%	1330
	21st to end	Night	22% 12% 5% 8% 5% 4 4 3 4 6% 27%	1330
July	1st to 10th	Night	16% 11% 4 8% 6% 5% 5% 4 5% 8% 27%	2352
	11th to 20th	Night	22% 12% 3 9% 5% 5% 4 4 5% 7% 25%	2520
	21st to end	Night	15% 7% 2 5% 4 3 4 4 5% 7% 43%	2739
August	1st to 10th	Night	17% 8% 3 8% 5% 4 4 4 6% 8% 33%	2506
	11th to 20th	Night	23% 10% 3 8% 6% 6% 5% 3 4 6% 25%	2752
	21st to end	Night	18% 9% 3 8% 5% 5% 5% 4 5% 7% 31%	3283
September	1st to 10th	Night	20% 10% 2 7% 4 4 3 2 4 6% 36%	1900
	11th to 20th	Night	20% 10% 3 6% 4 5% 4 3 4 6% 35%	2069
	21st to end	Night	22% 10% 2 6% 5% 3 3 3 4 6% 35%	2090
October	1st to 10th	Night	17% 14% 5% 7% 5% 5% 4 3 4 5% 30%	2093
	11th to 20th	Night	25% 18% 4 7% 4 4 4 3 4 5% 23%	2451
	21st to end	Night	23% 19% 5% 9% 5% 4 4 3 4 5% 20%	2717
November	1st to 10th	Night	17% 17% 7% 11% 5% 5% 4 3 5% 6% 21%	2453
	11th to 20th	Night	17% 16% 5% 14% 6% 5% 4 3 4 5% 20%	2489
	21st to end	Night	16% 19% 7% 14% 6% 6% 4 3 4 4 18%	2850
December	1st to 10th	Night	14% 19% 7% 15% 8% 6% 4 3 4 5% 15%	2850
	11th to 20th	Night	16% 16% 5% 14% 10% 6% 4 3 4 4 18%	3531
	21st to end	Night	15% 18% 8% 14% 6% 5% 4 3 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% 9% 11% 8% 3	2280
	11th to 20th	Day	54% 6% 9% 18% 10% 3	2356
	21st to end	Day	59% 6% 8% 13% 11% 3	2470
May	1st to 10th	Day	50% 13% 13% 12% 10% 2	4243
	11th to 20th	Day	49% 14% 15% 17% 5%	4402
	21st to end	Day	50% 12% 10% 16% 11%	4987
June	1st to 10th	Day	57% 11% 9% 17% 5% 1	2850
	11th to 20th	Day	53% 8% 14% 15% 8% 1	2850
	21st to end	Day	62% 7% 10% 13% 8%	2850
July	1st to 10th	Day	58% 8% 13% 16% 6%	4538
	11th to 20th	Day	55% 10% 16% 16% 3	4365
	21st to end	Day	48% 10% 14% 20% 7%	4661
August	1st to 10th	Day	55% 10% 15% 16% 4	4396
	11th to 20th	Day	60% 9% 15% 13% 3	4084
	21st to end	Day	51% 7% 15% 14% 11% 1	4358
September	1st to 10th	Day	52% 7% 14% 19% 9%	2280
	11th to 20th	Day	44% 8% 15% 23% 8% 1	2110
	21st to end	Day	52% 8% 11% 18% 10%	2090
October	1st to 10th	Day	58% 8% 9% 19% 5%	3462
	11th to 20th	Day	60% 6% 11% 17% 6%	2854
	21st to end	Day	57% 7% 16% 15% 6% 1	3081
November	1st to 10th	Day	61% 8% 9% 16% 6%	1698
	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	51% 9% 10% 17% 11% 2	1772
	21st to end	Night	54% 9% 8% 16% 11% 2	1710
May	1st to 10th	Night	49% 7% 15% 18% 10% 2	2746
	11th to 20th	Night	46% 11% 17% 17% 8% 1	2496
	21st to end	Night	43% 11% 15% 18% 12% 1	2592
June	1st to 10th	Night	51% 10% 13% 19% 6% 1	1330
	11th to 20th	Night	46% 9% 12% 19% 11% 3	1330
	21st to end	Night	58% 6% 12% 16% 9%	1330
July	1st to 10th	Night	52% 10% 16% 19% 4	2313
	11th to 20th	Night	55% 9% 17% 14% 4	2472
	21st to end	Night	38% 9% 24% 20% 10%	2651
August	1st to 10th	Night	48% 8% 19% 19% 6%	2496
	11th to 20th	Night	54% 11% 16% 14% 4	2779
	21st to end	Night	48% 8% 15% 22% 7% 1	3283
September	1st to 10th	Night	46% 8% 14% 22% 9% 1	1900
	11th to 20th	Night	46% 9% 15% 23% 6% 1	2069
	21st to end	Night	48% 7% 12% 23% 9% 1	2090
October	1st to 10th	Night	54% 7% 9% 22% 7%	3496
	11th to 20th	Night	59% 6% 10% 18% 8%	4065
	21st to end	Night	59% 8% 13% 12% 7% 1	4467
November	1st to 10th	Night	57% 11% 12% 15% 5%	2453
	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% 13% 3	460
	11th to 20th	Day	31% 24% 29% 10% 5% 1	452
	21st to end	Day	28% 25% 35% 7% 3 1	460
May	1st to 10th	Day	28% 20% 33% 13% 6% 1	463
	11th to 20th	Day	24% 21% 33% 18% 3 1	487
	21st to end	Day	28% 22% 29% 14% 5% 1	614
June	1st to 10th	Day	26% 19% 30% 18% 6%	680
	11th to 20th	Day	26% 22% 26% 17% 8% 1	680
	21st to end	Day	29% 16% 29% 20% 6%	680
July	1st to 10th	Day	21% 15% 35% 21% 8%	588
	11th to 20th	Day	24% 17% 37% 15% 6% 1	484
	21st to end	Day	21% 17% 36% 20% 5% 1	532
August	1st to 10th	Day	24% 16% 32% 17% 10% 1	486
	11th to 20th	Day	21% 12% 33% 24% 9% 2	479
	21st to end	Day	24% 19% 27% 15% 12% 3	539
September	1st to 10th	Day	24% 20% 27% 18% 8% 3	490
	11th to 20th	Day	23% 13% 31% 20% 9% 3	490
	21st to end	Day	27% 19% 24% 18% 7% 5%	490
October	1st to 10th	Day	26% 21% 27% 17% 6% 2	490
	11th to 20th	Day	34% 23% 26% 11% 6% 1	400
	21st to end	Day	37% 23% 27% 10% 3	429
November	1st to 10th	Day	33% 24% 26% 14% 4	374
	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	25% 19% 30% 20% 5%	648
	21st to end	Night	28% 19% 29% 20% 4 1	570
May	1st to 10th	Night	29% 14% 28% 23% 5%	515
	11th to 20th	Night	23% 12% 30% 26% 8%	374
	21st to end	Night	27% 13% 31% 23% 5%	411
June	1st to 10th	Night	23% 11% 28% 28% 9%	380
	11th to 20th	Night	23% 12% 24% 31% 10% 1	380
	21st to end	Night	26% 12% 26% 28% 8%	380
July	1st to 10th	Night	19% 11% 30% 30% 9% 1	370
	11th to 20th	Night	23% 9% 24% 32% 11% 1	368
	21st to end	Night	21% 9% 22% 36% 12%	416
August	1st to 10th	Night	19% 7% 22% 36% 15% 1	378
	11th to 20th	Night	24% 9% 25% 27% 14% 1	544
	21st to end	Night	22% 12% 24% 28% 12% 1	721
September	1st to 10th	Night	24% 11% 28% 25% 10% 1	760
	11th to 20th	Night	22% 13% 27% 23% 12% 2	760
	21st to end	Night	26% 16% 23% 23% 11% 1	760
October	1st to 10th	Night	27% 16% 25% 24% 7% 1	760
	11th to 20th	Night	33% 15% 26% 18% 8% 1	760
	21st to end	Night	33% 20% 27% 16% 5%	836
November	1st to 10th	Night	28% 21% 29% 17% 4 1	755
	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

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