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 2025-08-05.

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% 24%	125603
	Night	15% 14% 5% 12% 6% 5% 5% 4 5% 6% 24%	122501
Transparency	Day	57% 8% 11% 15% 9% 2	129044
	Night	57% 8% 10% 14% 9% 1	127148
Seeing	Day	27% 22% 30% 15% 6% 1	16271
	Night	24% 19% 29% 21% 6% 1	24627

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% 17% 7% 14% 10% 7% 6% 4 5% 5% 17%	3597
	11th to 20th	Day	6% 13% 7% 18% 12% 11% 4 3 4 3 20%	3570
	21st to end	Day	5% 7% 5% 19% 7% 6% 5% 5% 7% 8% 27%	3960
February	1st to 10th	Day	6% 14% 5% 17% 10% 7% 7% 4 5% 6% 20%	1600
	11th to 20th	Day	8% 17% 6% 16% 8% 5% 6% 4 4 6% 20%	1906
	21st to end	Day	9% 14% 7% 15% 8% 5% 6% 3 4 4 25%	1650
March	1st to 10th	Day	14% 20% 6% 15% 6% 4 3 2 3 4 24%	4476
	11th to 20th	Day	13% 20% 5% 11% 6% 4 4 3 5% 5% 24%	4750
	21st to end	Day	13% 18% 6% 10% 5% 4 4 3 4 5% 29%	5804
April	1st to 10th	Day	17% 20% 5% 10% 5% 4 3 3 4 5% 23%	2400
	11th to 20th	Day	17% 18% 5% 8% 4 4 4 3 4 5% 30%	2482
	21st to end	Day	20% 16% 5% 9% 5% 4 4 3 4 4 26%	2600
May	1st to 10th	Day	26% 13% 4 8% 5% 4 4 3 4 6% 24%	6065
	11th to 20th	Day	21% 12% 3 9% 6% 5% 5% 4 5% 6% 24%	6318
	21st to end	Day	20% 12% 3 8% 6% 5% 5% 4 5% 6% 25%	7169
June	1st to 10th	Day	23% 10% 3 8% 6% 6% 5% 4 6% 7% 22%	3000
	11th to 20th	Day	23% 10% 3 7% 5% 5% 5% 4 5% 7% 27%	3000
	21st to end	Day	27% 10% 4 9% 6% 4 4 4 5% 5% 23%	3000
July	1st to 10th	Day	21% 9% 4 10% 6% 6% 6% 5% 6% 6% 20%	6599
	11th to 20th	Day	20% 8% 3 8% 6% 6% 6% 5% 6% 7% 23%	6360
	21st to end	Day	15% 7% 2 7% 5% 6% 6% 4 7% 7% 33%	6926
August	1st to 10th	Day	19% 8% 3 9% 6% 6% 6% 5% 7% 7% 23%	4466
	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	18% 20% 7% 11% 5% 3 3 3 3 5% 22%	1761
	11th to 20th	Day	17% 19% 6% 14% 6% 4 4 2 4 5% 20%	1775
	21st to end	Day	14% 21% 8% 12% 8% 5% 3 4 5% 5% 15%	1400
December	1st to 10th	Day	13% 16% 8% 17% 7% 7% 4 3 4 5% 16%	2280
	11th to 20th	Day	13% 16% 7% 13% 7% 6% 4 3 4 4 21%	2618
	21st to end	Day	15% 15% 6% 13% 5% 4 3 3 4 5% 27%	3493
January	1st to 10th	Night	7% 19% 8% 16% 8% 8% 5% 4 5% 6% 14%	6349
	11th to 20th	Night	6% 13% 8% 20% 12% 11% 5% 3 4 4 13%	6315
	21st to end	Night	4 8% 4 17% 10% 7% 7% 6% 7% 8% 22%	6996
February	1st to 10th	Night	7% 12% 6% 14% 9% 8% 6% 4 6% 6% 22%	2800
	11th to 20th	Night	7% 17% 7% 16% 6% 6% 7% 4 5% 6% 19%	2378
	21st to end	Night	7% 17% 6% 13% 8% 6% 7% 4 6% 5% 22%	1980
March	1st to 10th	Night	13% 18% 6% 14% 7% 5% 3 6% 4 4 19%	5364
	11th to 20th	Night	11% 17% 7% 13% 7% 6% 6% 4 5% 5% 20%	5209
	21st to end	Night	13% 18% 6% 11% 4 4 4 3 4 5% 27%	5112
April	1st to 10th	Night	16% 19% 6% 11% 7% 4 4 3 3 4 24%	2000
	11th to 20th	Night	16% 16% 3 10% 4 4 4 4 5% 6% 27%	1866
	21st to end	Night	18% 15% 5% 9% 5% 4 4 2 4 5% 29%	1800
May	1st to 10th	Night	25% 10% 3 7% 4 4 4 3 5% 6% 31%	3918
	11th to 20th	Night	22% 12% 3 7% 5% 4 4 3 4 6% 31%	3575
	21st to end	Night	18% 11% 3 7% 4 4 4 4 5% 8% 32%	3714
June	1st to 10th	Night	20% 12% 3 7% 5% 5% 5% 5% 5% 7% 27%	1400
	11th to 20th	Night	21% 10% 3 7% 5% 3 4 3 4 8% 33%	1400
	21st to end	Night	22% 12% 5% 8% 5% 4 3 3 4 7% 28%	1400
July	1st to 10th	Night	17% 12% 4 8% 6% 5% 6% 5% 5% 8% 25%	3367
	11th to 20th	Night	23% 12% 3 7% 4 4 4 4 5% 7% 27%	3600
	21st to end	Night	14% 6% 3 7% 4 4 5% 4 5% 7% 41%	3926
August	1st to 10th	Night	17% 8% 3 8% 5% 4 4 4 6% 8% 33%	2538
	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	18% 17% 7% 11% 5% 5% 4 3 5% 6% 20%	2537
	11th to 20th	Night	16% 16% 6% 14% 6% 5% 4 3 4 5% 21%	2621
	21st to end	Night	15% 19% 8% 15% 6% 6% 5% 3 4 4 17%	3000
December	1st to 10th	Night	10% 15% 7% 21% 10% 9% 5% 3 4 4 13%	4910
	11th to 20th	Night	17% 16% 7% 13% 9% 6% 4 3 3 4 19%	5591
	21st to end	Night	15% 16% 7% 13% 6% 4 3 3 3 4 26%	7480

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	59% 12% 8% 12% 9%	3598
	11th to 20th	Day	65% 7% 6% 11% 9% 3	3600
	21st to end	Day	47% 10% 6% 13% 21% 2	3960
February	1st to 10th	Day	61% 6% 7% 13% 10% 3	1600
	11th to 20th	Day	63% 7% 8% 10% 9% 2	1915
	21st to end	Day	59% 5% 6% 16% 10% 4	1650
March	1st to 10th	Day	64% 5% 6% 9% 9% 6%	4479
	11th to 20th	Day	57% 8% 13% 11% 9% 2	4750
	21st to end	Day	56% 6% 5% 13% 14% 5%	5804
April	1st to 10th	Day	62% 6% 9% 11% 9% 3	2400
	11th to 20th	Day	55% 6% 9% 17% 10% 2	2482
	21st to end	Day	59% 6% 9% 13% 11% 2	2600
May	1st to 10th	Day	55% 10% 10% 12% 11% 2	6076
	11th to 20th	Day	54% 11% 12% 15% 5% 2	6322
	21st to end	Day	54% 10% 10% 14% 11% 1	7169
June	1st to 10th	Day	57% 10% 9% 17% 5% 1	3000
	11th to 20th	Day	54% 8% 14% 15% 8% 1	3000
	21st to end	Day	61% 7% 10% 13% 8%	3000
July	1st to 10th	Day	59% 8% 12% 16% 5%	6528
	11th to 20th	Day	53% 9% 18% 17% 3	6285
	21st to end	Day	45% 9% 14% 24% 8%	6728
August	1st to 10th	Day	55% 9% 15% 16% 5%	4452
	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	62% 8% 9% 16% 6%	1761
	11th to 20th	Day	64% 7% 7% 14% 6% 1	1775
	21st to end	Day	67% 9% 9% 11% 4 1	1400
December	1st to 10th	Day	69% 4 8% 10% 8%	2280
	11th to 20th	Day	62% 5% 7% 12% 13% 1	2618
	21st to end	Day	56% 8% 6% 10% 15% 5%	3493
January	1st to 10th	Night	65% 8% 7% 12% 8% 1	6349
	11th to 20th	Night	68% 9% 6% 10% 5% 1	6360
	21st to end	Night	52% 10% 8% 12% 16% 2	6996
February	1st to 10th	Night	57% 7% 7% 16% 11% 2	2800
	11th to 20th	Night	60% 9% 9% 10% 11% 1	2380
	21st to end	Night	58% 7% 8% 13% 12% 3	1980
March	1st to 10th	Night	63% 7% 7% 10% 10% 2	5374
	11th to 20th	Night	61% 9% 11% 10% 7% 2	5210
	21st to end	Night	56% 6% 7% 16% 12% 2	5112
April	1st to 10th	Night	61% 7% 6% 12% 11% 3	2000
	11th to 20th	Night	52% 9% 9% 17% 11% 2	1866
	21st to end	Night	55% 9% 8% 16% 11% 2	1800
May	1st to 10th	Night	54% 6% 11% 15% 12% 3	3924
	11th to 20th	Night	52% 9% 15% 17% 7% 1	3576
	21st to end	Night	46% 9% 14% 18% 12% 1	3715
June	1st to 10th	Night	51% 9% 13% 19% 7% 1	1400
	11th to 20th	Night	47% 9% 12% 19% 11% 3	1400
	21st to end	Night	57% 6% 11% 16% 9%	1400
July	1st to 10th	Night	53% 9% 17% 17% 4	3328
	11th to 20th	Night	54% 8% 21% 15% 3	3552
	21st to end	Night	38% 9% 22% 22% 9%	3809
August	1st to 10th	Night	48% 8% 19% 19% 7%	2528
	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% 11% 15% 5%	2537
	11th to 20th	Night	58% 10% 10% 11% 9% 1	2621
	21st to end	Night	66% 9% 8% 11% 6% 1	3000
December	1st to 10th	Night	70% 7% 7% 11% 4	4910
	11th to 20th	Night	66% 6% 5% 10% 12% 1	5592
	21st to end	Night	60% 7% 6% 9% 13% 5%	7480

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	22% 24% 40% 13% 2	200
	11th to 20th	Day	25% 24% 34% 13% 5% 1	200
	21st to end	Day	15% 27% 38% 12% 5% 2	220
February	1st to 10th	Day	26% 34% 33% 5% 3	200
	11th to 20th	Day	24% 30% 31% 12% 3	470
	21st to end	Day	25% 29% 30% 12% 3	414
March	1st to 10th	Day	24% 27% 35% 10% 4	500
	11th to 20th	Day	27% 27% 26% 14% 4	500
	21st to end	Day	28% 27% 26% 13% 5% 1	550
April	1st to 10th	Day	34% 24% 26% 13% 3	500
	11th to 20th	Day	32% 23% 29% 11% 4 1	492
	21st to end	Day	29% 25% 35% 7% 3 1	500
May	1st to 10th	Day	30% 19% 32% 12% 6% 1	503
	11th to 20th	Day	25% 20% 32% 18% 3 1	527
	21st to end	Day	28% 22% 29% 15% 6% 1	663
June	1st to 10th	Day	27% 19% 30% 18% 6%	730
	11th to 20th	Day	27% 22% 26% 17% 7% 1	730
	21st to end	Day	30% 16% 28% 19% 5%	730
July	1st to 10th	Day	23% 16% 34% 20% 7%	633
	11th to 20th	Day	24% 18% 37% 14% 6% 1	524
	21st to end	Day	21% 19% 35% 19% 5% 1	576
August	1st to 10th	Day	23% 16% 33% 18% 9% 1	502
	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	35% 23% 25% 13% 4	395
	11th to 20th	Day	29% 20% 29% 15% 6% 1	385
	21st to end	Day	26% 34% 31% 8% 2 1	200
December	1st to 10th	Day	27% 20% 32% 17% 5% 1	200
	11th to 20th	Day	32% 26% 29% 9% 3 1	200
	21st to end	Day	28% 29% 26% 11% 5% 2	220
January	1st to 10th	Night	19% 25% 37% 16% 3	800
	11th to 20th	Night	20% 26% 30% 18% 5% 1	800
	21st to end	Night	14% 20% 39% 21% 5% 1	880
February	1st to 10th	Night	15% 26% 38% 18% 4	800
	11th to 20th	Night	19% 26% 37% 14% 4 1	783
	21st to end	Night	19% 23% 39% 16% 3	660
March	1st to 10th	Night	18% 24% 37% 19% 3	800
	11th to 20th	Night	21% 28% 32% 15% 5% 1	800
	21st to end	Night	21% 25% 31% 17% 6%	880
April	1st to 10th	Night	29% 20% 30% 16% 4	800
	11th to 20th	Night	26% 19% 30% 20% 5%	682
	21st to end	Night	29% 19% 29% 19% 4 1	600
May	1st to 10th	Night	30% 14% 27% 23% 5%	542
	11th to 20th	Night	24% 12% 30% 26% 8%	394
	21st to end	Night	27% 13% 31% 23% 5%	433
June	1st to 10th	Night	24% 11% 29% 28% 9%	400
	11th to 20th	Night	24% 12% 24% 31% 10% 1	400
	21st to end	Night	27% 13% 26% 27% 8%	400
July	1st to 10th	Night	20% 12% 30% 29% 9% 1	390
	11th to 20th	Night	23% 9% 25% 31% 11% 1	388
	21st to end	Night	20% 10% 24% 34% 11%	438
August	1st to 10th	Night	19% 7% 23% 37% 15% 1	386
	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% 28% 17% 4 1	780
	11th to 20th	Night	25% 25% 24% 17% 6% 1	805
	21st to end	Night	25% 27% 29% 15% 4 1	900
December	1st to 10th	Night	23% 23% 28% 20% 5% 1	900
	11th to 20th	Night	25% 24% 27% 18% 5%	900
	21st to end	Night	26% 24% 28% 17% 5% 1	985

Page generated at 2025-08-02 01:32:22. Version ac07

Copyright © 2025 Attilla Danko.