Black Bear Adventures Quebec
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Black Bear Adventures Quebec clear sky chart from 2005-11-06 to 2026-03-18.

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	16% 13% 5% 11% 7% 6% 5% 4 5% 6% 23%	131298
	Night	15% 14% 5% 13% 7% 6% 6% 4 5% 5% 20%	130219
Transparency	Day	61% 6% 9% 16% 7% 1	134679
	Night	64% 5% 9% 15% 6%	134927
Seeing	Day	22% 12% 30% 23% 10% 3	16825
	Night	23% 11% 30% 26% 9% 1	25258

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	11% 23% 8% 16% 10% 7% 6% 4 3 3 8%	4661
	11th to 20th	Day	7% 16% 8% 18% 13% 10% 8% 6% 5% 3 7%	4650
	21st to end	Day	3 8% 4 20% 11% 7% 8% 8% 9% 6% 15%	5124
February	1st to 10th	Day	6% 14% 5% 13% 11% 9% 8% 6% 6% 6% 17%	1717
	11th to 20th	Day	9% 17% 5% 15% 8% 8% 8% 6% 6% 4 13%	1862
	21st to end	Day	7% 16% 5% 14% 9% 7% 7% 5% 6% 5% 19%	1730
March	1st to 10th	Day	15% 18% 7% 12% 7% 4 3 3 5% 4 22%	4576
	11th to 20th	Day	16% 18% 6% 15% 8% 5% 5% 4 5% 5% 14%	4762
	21st to end	Day	10% 15% 6% 12% 7% 7% 6% 4 5% 5% 23%	5967
April	1st to 10th	Day	16% 16% 7% 11% 6% 5% 5% 3 4 5% 22%	2400
	11th to 20th	Day	16% 12% 4 9% 6% 5% 5% 4 6% 7% 26%	2413
	21st to end	Day	19% 15% 4 8% 6% 5% 4 3 5% 4 27%	2702
May	1st to 10th	Day	16% 12% 4 9% 6% 5% 5% 4 5% 5% 30%	6346
	11th to 20th	Day	25% 9% 3 7% 5% 5% 5% 4 6% 7% 25%	6318
	21st to end	Day	16% 10% 3 8% 5% 5% 5% 3 5% 6% 33%	7059
June	1st to 10th	Day	20% 9% 4 9% 5% 5% 4 5% 5% 7% 27%	3000
	11th to 20th	Day	16% 8% 3 8% 5% 5% 6% 5% 7% 7% 29%	3022
	21st to end	Day	21% 9% 3 8% 5% 5% 6% 5% 6% 6% 26%	3200
July	1st to 10th	Day	18% 9% 3 8% 6% 6% 5% 4 6% 8% 27%	6641
	11th to 20th	Day	17% 7% 2 7% 5% 5% 6% 5% 7% 10% 29%	6360
	21st to end	Day	15% 7% 3 7% 5% 6% 6% 5% 7% 10% 29%	6926
August	1st to 10th	Day	16% 9% 3 8% 6% 6% 6% 5% 7% 9% 24%	4563
	11th to 20th	Day	16% 9% 3 9% 5% 5% 5% 4 6% 7% 30%	4447
	21st to end	Day	15% 8% 3 8% 5% 5% 5% 4 5% 7% 36%	4350
September	1st to 10th	Day	21% 10% 3 8% 5% 4 5% 4 5% 7% 28%	2400
	11th to 20th	Day	18% 10% 4 10% 5% 5% 5% 4 5% 6% 28%	2330
	21st to end	Day	24% 12% 3 8% 4 4 4 3 4 5% 29%	2200
October	1st to 10th	Day	22% 13% 3 8% 4 4 5% 4 4 6% 27%	2028
	11th to 20th	Day	29% 20% 5% 8% 5% 4 4 2 4 4 15%	1898
	21st to end	Day	26% 20% 6% 12% 5% 5% 4 3 4 4 13%	1980
November	1st to 10th	Day	19% 24% 6% 14% 6% 5% 4 3 3 3 13%	1809
	11th to 20th	Day	19% 21% 9% 15% 7% 5% 4 3 3 4 10%	1680
	21st to end	Day	20% 25% 9% 17% 8% 5% 4 2 3 3 5%	1519
December	1st to 10th	Day	10% 21% 9% 20% 7% 9% 4 3 4 4 9%	2350
	11th to 20th	Day	14% 17% 7% 15% 10% 9% 8% 4 4 3 9%	2688
	21st to end	Day	13% 18% 8% 16% 9% 8% 6% 4 5% 3 10%	3620
January	1st to 10th	Night	12% 22% 9% 17% 7% 8% 7% 5% 4 4 7%	8234
	11th to 20th	Night	7% 19% 9% 21% 10% 7% 7% 4 5% 3 8%	8235
	21st to end	Night	3 7% 6% 17% 10% 11% 10% 7% 9% 6% 14%	9057
February	1st to 10th	Night	7% 12% 5% 14% 9% 8% 9% 7% 7% 6% 16%	2901
	11th to 20th	Night	8% 18% 6% 14% 8% 8% 6% 6% 6% 5% 15%	2643
	21st to end	Night	8% 14% 6% 13% 9% 7% 7% 6% 6% 5% 21%	2076
March	1st to 10th	Night	14% 15% 5% 11% 6% 5% 7% 5% 6% 5% 19%	5484
	11th to 20th	Night	15% 16% 6% 14% 8% 6% 7% 4 5% 5% 14%	5350
	21st to end	Night	13% 15% 4 11% 5% 6% 6% 4 5% 5% 25%	4965
April	1st to 10th	Night	16% 15% 5% 11% 7% 6% 6% 3 4 5% 23%	2000
	11th to 20th	Night	15% 11% 4 10% 6% 4 5% 4 5% 6% 30%	1935
	21st to end	Night	17% 13% 4 9% 5% 5% 3 3 4 5% 32%	1715
May	1st to 10th	Night	17% 11% 5% 8% 4 5% 4 3 5% 5% 33%	3594
	11th to 20th	Night	26% 10% 3 8% 4 4 4 3 5% 5% 29%	3575
	21st to end	Night	20% 11% 3 8% 5% 5% 4 3 5% 6% 30%	3804
June	1st to 10th	Night	21% 9% 4 7% 5% 4 5% 4 7% 6% 29%	1400
	11th to 20th	Night	16% 8% 3 7% 6% 5% 5% 5% 7% 7% 32%	1369
	21st to end	Night	17% 8% 3 7% 5% 5% 4 5% 5% 8% 33%	1200
July	1st to 10th	Night	15% 9% 4 10% 7% 6% 5% 4 6% 6% 28%	3318
	11th to 20th	Night	18% 9% 4 8% 5% 5% 5% 5% 6% 7% 29%	3600
	21st to end	Night	14% 6% 2 6% 5% 4 5% 4 5% 9% 40%	3926
August	1st to 10th	Night	15% 6% 3 7% 5% 6% 5% 5% 7% 8% 33%	2586
	11th to 20th	Night	15% 6% 2 7% 5% 5% 6% 3 7% 8% 36%	2568
	21st to end	Night	15% 6% 3 7% 5% 5% 5% 4 6% 8% 36%	3546
September	1st to 10th	Night	19% 9% 3 8% 4 4 4 3 4 6% 36%	2000
	11th to 20th	Night	19% 9% 3 7% 4 5% 5% 3 5% 6% 33%	2069
	21st to end	Night	20% 9% 3 7% 5% 4 5% 3 5% 6% 33%	2200
October	1st to 10th	Night	19% 12% 4 8% 5% 5% 4 2 4 6% 31%	2370
	11th to 20th	Night	26% 18% 5% 10% 5% 4 4 2 4 4 17%	2501
	21st to end	Night	27% 16% 5% 11% 5% 5% 4 3 4 4 15%	2860
November	1st to 10th	Night	22% 21% 7% 13% 7% 5% 4 3 4 3 12%	2705
	11th to 20th	Night	16% 20% 7% 15% 7% 6% 6% 3 4 5% 11%	2940
	21st to end	Night	18% 23% 7% 17% 8% 6% 4 3 3 3 6%	3098
December	1st to 10th	Night	11% 17% 7% 22% 10% 9% 5% 3 4 4 8%	5060
	11th to 20th	Night	18% 15% 7% 13% 9% 8% 6% 4 4 4 12%	5741
	21st to end	Night	14% 17% 7% 15% 9% 8% 6% 4 4 5% 11%	7594

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	81% 4 5% 9% 1	4662
	11th to 20th	Day	79% 4 3 6% 7%	4680
	21st to end	Day	63% 4 7% 17% 9%	5124
February	1st to 10th	Day	66% 5% 6% 15% 8% 1	1717
	11th to 20th	Day	70% 5% 8% 10% 7%	1871
	21st to end	Day	65% 5% 5% 14% 9% 1	1730
March	1st to 10th	Day	65% 2 5% 12% 14% 1	4579
	11th to 20th	Day	72% 4 6% 11% 6% 1	4762
	21st to end	Day	60% 4 7% 13% 13% 3	5967
April	1st to 10th	Day	65% 5% 9% 11% 9% 1	2400
	11th to 20th	Day	56% 6% 9% 16% 12% 1	2413
	21st to end	Day	59% 4 6% 17% 13% 1	2702
May	1st to 10th	Day	54% 6% 8% 16% 14% 3	6357
	11th to 20th	Day	56% 8% 7% 20% 8% 1	6322
	21st to end	Day	51% 5% 9% 19% 15% 1	7059
June	1st to 10th	Day	56% 6% 8% 19% 10% 1	3000
	11th to 20th	Day	51% 7% 11% 18% 12% 2	3022
	21st to end	Day	56% 7% 8% 19% 10% 1	3200
July	1st to 10th	Day	53% 7% 12% 24% 4	6572
	11th to 20th	Day	47% 8% 15% 24% 5%	6285
	21st to end	Day	48% 8% 14% 25% 5%	6728
August	1st to 10th	Day	53% 8% 14% 21% 3	4549
	11th to 20th	Day	52% 7% 15% 21% 5%	4489
	21st to end	Day	46% 6% 10% 27% 11%	4350
September	1st to 10th	Day	56% 6% 13% 17% 7%	2400
	11th to 20th	Day	55% 7% 14% 19% 4	2330
	21st to end	Day	59% 5% 12% 18% 5%	2200
October	1st to 10th	Day	61% 6% 11% 17% 4 1	3301
	11th to 20th	Day	70% 4 10% 14% 2	3062
	21st to end	Day	76% 7% 9% 6% 2 1	3180
November	1st to 10th	Day	77% 5% 9% 7% 2 1	1809
	11th to 20th	Day	79% 5% 7% 7% 2	1680
	21st to end	Day	86% 3 5% 5% 1	1519
December	1st to 10th	Day	80% 4 5% 10% 1	2350
	11th to 20th	Day	79% 3 4 8% 6%	2688
	21st to end	Day	77% 4 6% 9% 4	3620
January	1st to 10th	Night	80% 5% 5% 9% 1	8234
	11th to 20th	Night	79% 4 4 8% 5%	8280
	21st to end	Night	65% 4 7% 18% 5%	9057
February	1st to 10th	Night	64% 5% 9% 12% 9%	2901
	11th to 20th	Night	67% 6% 9% 11% 7%	2645
	21st to end	Night	61% 6% 9% 16% 8%	2076
March	1st to 10th	Night	64% 5% 6% 15% 10% 1	5494
	11th to 20th	Night	70% 5% 6% 11% 7% 1	5351
	21st to end	Night	59% 5% 7% 19% 10% 1	4965
April	1st to 10th	Night	63% 5% 9% 13% 9% 2	2000
	11th to 20th	Night	53% 6% 7% 22% 11% 1	1935
	21st to end	Night	56% 4 8% 19% 12% 1	1715
May	1st to 10th	Night	50% 7% 8% 19% 14% 2	3600
	11th to 20th	Night	56% 7% 7% 21% 9% 1	3576
	21st to end	Night	53% 5% 8% 18% 14% 1	3805
June	1st to 10th	Night	53% 7% 9% 20% 10% 1	1400
	11th to 20th	Night	50% 7% 10% 19% 12% 2	1369
	21st to end	Night	49% 8% 13% 22% 9% 1	1200
July	1st to 10th	Night	55% 7% 8% 21% 9%	3278
	11th to 20th	Night	52% 7% 15% 19% 6%	3552
	21st to end	Night	42% 7% 13% 33% 5%	3809
August	1st to 10th	Night	46% 10% 17% 24% 4	2576
	11th to 20th	Night	43% 8% 18% 25% 5%	2592
	21st to end	Night	44% 6% 14% 27% 8%	3546
September	1st to 10th	Night	50% 6% 14% 20% 9%	2000
	11th to 20th	Night	51% 8% 16% 20% 4	2069
	21st to end	Night	52% 7% 13% 23% 6%	2200
October	1st to 10th	Night	58% 5% 12% 19% 4 1	3877
	11th to 20th	Night	67% 5% 11% 12% 4	4076
	21st to end	Night	72% 5% 11% 8% 3	4610
November	1st to 10th	Night	77% 5% 7% 7% 3	2705
	11th to 20th	Night	75% 6% 8% 9% 2	2940
	21st to end	Night	84% 4 7% 5% 1	3098
December	1st to 10th	Night	79% 5% 7% 8% 1	5060
	11th to 20th	Night	74% 4 7% 12% 3	5742
	21st to end	Night	74% 4 8% 10% 3 1	7594

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	15% 14% 36% 28% 7%	220
	11th to 20th	Day	13% 13% 36% 20% 12% 6%	220
	21st to end	Day	11% 8% 33% 31% 14% 3	242
February	1st to 10th	Day	9% 9% 42% 28% 9% 3	239
	11th to 20th	Day	16% 16% 36% 26% 7%	349
	21st to end	Day	17% 15% 38% 21% 8% 1	446
March	1st to 10th	Day	21% 14% 32% 24% 9% 1	540
	11th to 20th	Day	23% 13% 33% 20% 9% 2	528
	21st to end	Day	21% 16% 28% 27% 7% 2	550
April	1st to 10th	Day	23% 15% 31% 20% 10% 1	500
	11th to 20th	Day	22% 16% 27% 23% 7% 5%	492
	21st to end	Day	25% 15% 34% 17% 7% 1	500
May	1st to 10th	Day	22% 14% 27% 25% 9% 3	503
	11th to 20th	Day	23% 13% 27% 21% 13% 3	527
	21st to end	Day	23% 15% 29% 25% 7% 1	618
June	1st to 10th	Day	24% 9% 30% 25% 10% 1	730
	11th to 20th	Day	19% 13% 29% 24% 13% 2	752
	21st to end	Day	23% 9% 28% 27% 11% 2	930
July	1st to 10th	Day	22% 9% 28% 28% 10% 3	651
	11th to 20th	Day	21% 9% 31% 25% 11% 4	524
	21st to end	Day	19% 9% 28% 25% 14% 5%	576
August	1st to 10th	Day	18% 9% 27% 24% 17% 6%	526
	11th to 20th	Day	19% 7% 27% 22% 16% 8%	519
	21st to end	Day	22% 9% 27% 23% 12% 7%	583
September	1st to 10th	Day	23% 12% 32% 18% 11% 5%	530
	11th to 20th	Day	18% 10% 31% 25% 12% 5%	530
	21st to end	Day	27% 15% 19% 23% 11% 5%	530
October	1st to 10th	Day	26% 13% 30% 18% 10% 3	530
	11th to 20th	Day	33% 15% 26% 18% 6% 2	473
	21st to end	Day	33% 13% 26% 21% 6% 1	462
November	1st to 10th	Day	32% 16% 33% 16% 3 1	383
	11th to 20th	Day	27% 15% 28% 20% 9% 1	220
	21st to end	Day	34% 15% 30% 14% 6% 2	220
December	1st to 10th	Day	18% 11% 32% 22% 14% 3	220
	11th to 20th	Day	25% 16% 30% 20% 6% 4	220
	21st to end	Day	21% 12% 31% 23% 10% 1	242
January	1st to 10th	Night	21% 12% 34% 25% 8%	840
	11th to 20th	Night	21% 13% 31% 26% 8% 1	840
	21st to end	Night	12% 9% 33% 33% 12% 1	924
February	1st to 10th	Night	12% 10% 35% 30% 11% 2	840
	11th to 20th	Night	17% 13% 34% 28% 7% 1	823
	21st to end	Night	17% 14% 32% 28% 9% 1	692
March	1st to 10th	Night	17% 12% 35% 27% 8%	840
	11th to 20th	Night	21% 16% 28% 27% 7% 1	829
	21st to end	Night	21% 13% 33% 26% 6% 1	880
April	1st to 10th	Night	25% 11% 31% 27% 6%	800
	11th to 20th	Night	21% 13% 28% 29% 9%	751
	21st to end	Night	24% 13% 32% 24% 6%	515
May	1st to 10th	Night	24% 10% 30% 26% 10% 1	400
	11th to 20th	Night	22% 9% 27% 29% 11% 1	394
	21st to end	Night	27% 9% 29% 25% 8% 1	433
June	1st to 10th	Night	23% 7% 31% 31% 8% 1	400
	11th to 20th	Night	19% 8% 32% 30% 10%	400
	21st to end	Night	21% 6% 25% 36% 12% 1	400
July	1st to 10th	Night	23% 5% 29% 33% 9% 1	390
	11th to 20th	Night	18% 6% 28% 33% 14% 1	388
	21st to end	Night	18% 7% 24% 34% 16% 1	438
August	1st to 10th	Night	18% 4 25% 29% 22% 2	398
	11th to 20th	Night	19% 4 25% 31% 18% 2	401
	21st to end	Night	21% 9% 25% 27% 15% 3	853
September	1st to 10th	Night	24% 7% 27% 27% 13% 2	800
	11th to 20th	Night	23% 10% 27% 27% 12% 3	800
	21st to end	Night	26% 7% 29% 27% 10% 1	800
October	1st to 10th	Night	25% 11% 33% 23% 8% 1	800
	11th to 20th	Night	35% 12% 24% 21% 7% 1	800
	21st to end	Night	35% 9% 27% 21% 7% 1	880
November	1st to 10th	Night	32% 15% 27% 20% 5% 1	820
	11th to 20th	Night	25% 17% 29% 22% 7% 1	840
	21st to end	Night	30% 14% 30% 19% 6% 1	923
December	1st to 10th	Night	23% 13% 31% 22% 10% 1	950
	11th to 20th	Night	22% 13% 33% 21% 9% 2	950
	21st to end	Night	24% 14% 28% 27% 7% 1	1026

Page generated at 2026-03-15 02:23:50. Version ac07

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