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 2024-12-06.

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% 4 11% 6% 6% 5% 4 5% 6% 23%	102116
	Night	15% 14% 5% 12% 7% 6% 5% 4 5% 5% 21%	97606
Transparency	Day	60% 6% 10% 16% 7% 1	105514
	Night	63% 6% 10% 15% 6%	102298
Seeing	Day	22% 12% 30% 23% 10% 3	15268
	Night	23% 11% 30% 26% 9% 1	23572

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% 17% 8% 17% 9% 9% 7% 4 4 4 9%	2517
	11th to 20th	Day	10% 14% 5% 17% 13% 12% 10% 4 5% 4 7%	2520
	21st to end	Day	6% 14% 5% 22% 9% 6% 6% 4 6% 5% 15%	2772
February	1st to 10th	Day	6% 15% 5% 13% 11% 8% 7% 6% 6% 6% 17%	1553
	11th to 20th	Day	10% 16% 5% 15% 9% 9% 8% 7% 6% 4 11%	1680
	21st to end	Day	8% 16% 6% 14% 9% 7% 7% 5% 6% 5% 18%	1570
March	1st to 10th	Day	16% 16% 5% 10% 6% 4 4 3 5% 5% 27%	3116
	11th to 20th	Day	10% 19% 7% 16% 9% 6% 5% 4 5% 5% 15%	3276
	21st to end	Day	10% 14% 6% 14% 7% 5% 5% 4 5% 6% 25%	4163
April	1st to 10th	Day	17% 17% 7% 10% 6% 5% 5% 4 4 5% 22%	2280
	11th to 20th	Day	16% 12% 4 9% 6% 5% 5% 4 6% 7% 26%	2291
	21st to end	Day	18% 15% 4 8% 6% 5% 4 3 5% 4 28%	2567
May	1st to 10th	Day	16% 12% 4 10% 7% 6% 5% 4 6% 6% 24%	4426
	11th to 20th	Day	16% 9% 3 8% 6% 5% 6% 5% 8% 8% 27%	4398
	21st to end	Day	16% 9% 3 8% 5% 5% 5% 4 6% 7% 32%	4919
June	1st to 10th	Day	20% 9% 4 10% 5% 5% 4 4 5% 6% 27%	2850
	11th to 20th	Day	16% 8% 3 8% 5% 5% 6% 5% 7% 7% 29%	2871
	21st to end	Day	21% 9% 3 8% 5% 5% 6% 5% 6% 6% 26%	3040
July	1st to 10th	Day	18% 8% 3 7% 5% 6% 5% 4 6% 8% 29%	4638
	11th to 20th	Day	14% 8% 2 8% 6% 6% 6% 5% 6% 9% 31%	4440
	21st to end	Day	14% 8% 3 8% 6% 6% 6% 5% 7% 9% 29%	4814
August	1st to 10th	Day	16% 9% 3 8% 6% 6% 6% 5% 7% 8% 24%	4423
	11th to 20th	Day	17% 9% 3 9% 5% 5% 5% 4 6% 7% 30%	4309
	21st to end	Day	14% 8% 3 8% 5% 5% 4 4 5% 7% 37%	4217
September	1st to 10th	Day	21% 10% 3 8% 5% 4 5% 4 5% 6% 28%	2280
	11th to 20th	Day	19% 10% 4 10% 5% 5% 5% 4 5% 6% 28%	2214
	21st to end	Day	25% 12% 3 8% 4 4 4 3 3 4 28%	2090
October	1st to 10th	Day	23% 14% 3 8% 5% 4 5% 3 4 6% 26%	1927
	11th to 20th	Day	30% 20% 5% 9% 5% 4 4 2 3 4 14%	1803
	21st to end	Day	25% 20% 5% 12% 5% 5% 4 3 4 4 13%	1881
November	1st to 10th	Day	20% 23% 6% 14% 6% 5% 3 3 3 3 14%	1721
	11th to 20th	Day	19% 20% 9% 15% 7% 5% 5% 3 3 4 10%	1600
	21st to end	Day	20% 25% 8% 16% 8% 5% 4 2 3 3 6%	1447
December	1st to 10th	Day	15% 22% 7% 16% 9% 7% 6% 3 4 3 9%	1365
	11th to 20th	Day	18% 17% 5% 13% 9% 6% 7% 4 4 4 13%	1668
	21st to end	Day	12% 17% 9% 19% 9% 8% 6% 4 5% 3 8%	2470
January	1st to 10th	Night	12% 19% 8% 16% 8% 9% 7% 4 4 4 8%	4429
	11th to 20th	Night	10% 16% 6% 18% 11% 9% 8% 5% 6% 4 9%	4440
	21st to end	Night	6% 12% 9% 19% 8% 9% 6% 5% 6% 5% 14%	4884
February	1st to 10th	Night	8% 13% 5% 13% 8% 8% 8% 6% 7% 6% 17%	2625
	11th to 20th	Night	9% 18% 5% 14% 9% 9% 6% 6% 6% 5% 14%	2385
	21st to end	Night	8% 13% 6% 12% 8% 6% 7% 6% 7% 5% 20%	1884
March	1st to 10th	Night	14% 15% 4 9% 6% 5% 6% 5% 5% 5% 24%	3724
	11th to 20th	Night	13% 17% 6% 16% 9% 6% 6% 4 4 4 14%	3681
	21st to end	Night	12% 15% 5% 14% 6% 6% 5% 4 5% 6% 23%	3469
April	1st to 10th	Night	16% 16% 5% 10% 6% 5% 6% 3 4 5% 23%	1900
	11th to 20th	Night	15% 11% 4 10% 6% 4 5% 4 5% 6% 29%	1837
	21st to end	Night	17% 13% 4 9% 6% 5% 3 3 4 5% 32%	1629
May	1st to 10th	Night	18% 11% 4 9% 5% 5% 4 3 6% 5% 30%	2514
	11th to 20th	Night	16% 10% 3 7% 5% 5% 5% 4 6% 7% 33%	2495
	21st to end	Night	20% 10% 3 8% 5% 5% 5% 4 5% 8% 27%	2655
June	1st to 10th	Night	20% 9% 4 7% 5% 4 5% 4 7% 7% 29%	1330
	11th to 20th	Night	16% 8% 3 7% 6% 5% 5% 5% 6% 7% 33%	1301
	21st to end	Night	16% 8% 3 8% 6% 5% 4 5% 5% 8% 33%	1140
July	1st to 10th	Night	16% 9% 4 9% 6% 6% 5% 4 5% 7% 30%	2316
	11th to 20th	Night	15% 8% 3 8% 5% 5% 4 5% 6% 8% 32%	2520
	21st to end	Night	13% 7% 2 7% 5% 5% 5% 5% 5% 8% 37%	2739
August	1st to 10th	Night	15% 6% 3 8% 5% 6% 5% 5% 7% 8% 32%	2506
	11th to 20th	Night	15% 7% 3 7% 5% 4 6% 3 6% 8% 36%	2488
	21st to end	Night	14% 6% 3 7% 5% 5% 5% 4 6% 8% 37%	3437
September	1st to 10th	Night	19% 9% 3 8% 4 4 4 3 5% 6% 36%	1900
	11th to 20th	Night	20% 10% 3 7% 5% 5% 5% 3 5% 6% 32%	1965
	21st to end	Night	21% 9% 2 7% 5% 4 4 3 5% 6% 32%	2090
October	1st to 10th	Night	19% 12% 5% 8% 5% 5% 4 2 5% 6% 29%	2251
	11th to 20th	Night	27% 18% 5% 10% 5% 5% 4 2 4 4 16%	2376
	21st to end	Night	27% 16% 5% 11% 5% 5% 4 3 4 5% 15%	2717
November	1st to 10th	Night	22% 21% 7% 12% 7% 4 4 3 4 3 13%	2573
	11th to 20th	Night	16% 19% 7% 15% 7% 6% 6% 3 5% 5% 11%	2800
	21st to end	Night	19% 23% 7% 17% 8% 6% 5% 3 4 3 7%	2950
December	1st to 10th	Night	15% 21% 7% 17% 9% 7% 4 3 4 4 10%	2932
	11th to 20th	Night	18% 17% 7% 11% 9% 7% 5% 4 5% 5% 12%	3531
	21st to end	Night	13% 17% 8% 18% 10% 7% 5% 4 4 3 10%	5193

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	79% 4 7% 9% 1	2518
	11th to 20th	Day	78% 6% 5% 7% 4	2520
	21st to end	Day	67% 5% 7% 11% 9%	2772
February	1st to 10th	Day	65% 5% 5% 15% 8% 1	1553
	11th to 20th	Day	70% 5% 8% 9% 7%	1689
	21st to end	Day	66% 6% 6% 12% 9% 1	1570
March	1st to 10th	Day	60% 3 7% 16% 13% 1	3119
	11th to 20th	Day	69% 5% 6% 14% 5% 1	3276
	21st to end	Day	59% 4 9% 12% 13% 3	4163
April	1st to 10th	Day	64% 5% 10% 11% 9% 1	2280
	11th to 20th	Day	56% 6% 9% 16% 11% 1	2291
	21st to end	Day	59% 4 6% 17% 13% 1	2567
May	1st to 10th	Day	57% 7% 10% 16% 10% 1	4440
	11th to 20th	Day	50% 10% 9% 22% 8% 1	4402
	21st to end	Day	49% 6% 11% 21% 13% 1	4919
June	1st to 10th	Day	57% 6% 7% 19% 10% 1	2850
	11th to 20th	Day	50% 7% 11% 18% 12% 2	2871
	21st to end	Day	56% 7% 8% 19% 9%	3040
July	1st to 10th	Day	52% 7% 12% 24% 5%	4568
	11th to 20th	Day	46% 8% 15% 23% 8% 1	4365
	21st to end	Day	49% 8% 14% 22% 7%	4661
August	1st to 10th	Day	54% 8% 14% 21% 3	4409
	11th to 20th	Day	53% 7% 14% 21% 5%	4351
	21st to end	Day	46% 6% 10% 27% 11%	4217
September	1st to 10th	Day	56% 6% 13% 17% 8%	2280
	11th to 20th	Day	56% 7% 14% 19% 4	2214
	21st to end	Day	61% 5% 12% 17% 5%	2090
October	1st to 10th	Day	62% 6% 11% 17% 4 1	3200
	11th to 20th	Day	71% 4 10% 13% 1	2967
	21st to end	Day	76% 7% 9% 5% 2 1	3081
November	1st to 10th	Day	76% 5% 9% 7% 2 1	1721
	11th to 20th	Day	79% 5% 7% 7% 2	1600
	21st to end	Day	86% 3 6% 5% 1	1447
December	1st to 10th	Day	81% 4 5% 8% 2	1365
	11th to 20th	Day	75% 3 6% 10% 5% 1	1668
	21st to end	Day	77% 4 7% 5% 6% 1	2470
January	1st to 10th	Night	77% 5% 7% 8% 2	4429
	11th to 20th	Night	76% 5% 5% 9% 4	4440
	21st to end	Night	69% 5% 6% 14% 6%	4884
February	1st to 10th	Night	64% 5% 8% 13% 9% 1	2625
	11th to 20th	Night	68% 6% 9% 11% 6%	2387
	21st to end	Night	61% 6% 9% 15% 8%	1884
March	1st to 10th	Night	60% 6% 7% 19% 8% 1	3734
	11th to 20th	Night	70% 5% 6% 11% 6%	3682
	21st to end	Night	61% 5% 7% 17% 8% 1	3469
April	1st to 10th	Night	62% 5% 9% 13% 9% 2	1900
	11th to 20th	Night	54% 6% 7% 22% 10% 1	1837
	21st to end	Night	56% 4 8% 18% 13% 1	1629
May	1st to 10th	Night	53% 8% 10% 17% 11% 1	2520
	11th to 20th	Night	47% 9% 9% 25% 9% 1	2496
	21st to end	Night	53% 7% 10% 18% 13%	2656
June	1st to 10th	Night	53% 7% 9% 20% 10% 1	1330
	11th to 20th	Night	49% 7% 10% 20% 12% 2	1301
	21st to end	Night	48% 8% 12% 22% 9%	1140
July	1st to 10th	Night	52% 8% 8% 25% 8%	2276
	11th to 20th	Night	48% 7% 15% 21% 8%	2472
	21st to end	Night	44% 8% 13% 30% 5%	2651
August	1st to 10th	Night	46% 10% 17% 23% 4	2496
	11th to 20th	Night	44% 8% 18% 25% 5%	2512
	21st to end	Night	43% 6% 14% 28% 8%	3437
September	1st to 10th	Night	51% 6% 13% 21% 9%	1900
	11th to 20th	Night	53% 8% 16% 19% 4	1965
	21st to end	Night	53% 7% 13% 22% 5%	2090
October	1st to 10th	Night	59% 5% 12% 19% 4 1	3758
	11th to 20th	Night	68% 5% 11% 12% 3	3951
	21st to end	Night	72% 6% 11% 8% 3	4467
November	1st to 10th	Night	76% 5% 8% 7% 3	2573
	11th to 20th	Night	74% 6% 8% 9% 2	2800
	21st to end	Night	83% 5% 7% 5% 1	2950
December	1st to 10th	Night	79% 4 8% 8% 2	2932
	11th to 20th	Night	71% 5% 8% 12% 4	3532
	21st to end	Night	75% 5% 10% 6% 3 1	5193

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	11% 15% 41% 26% 8%	180
	11th to 20th	Day	14% 13% 36% 19% 12% 6%	180
	21st to end	Day	12% 9% 28% 32% 16% 3	198
February	1st to 10th	Day	11% 10% 43% 27% 7% 1	195
	11th to 20th	Day	16% 16% 35% 25% 8%	287
	21st to end	Day	17% 16% 38% 20% 8% 1	382
March	1st to 10th	Day	20% 14% 31% 24% 10% 1	460
	11th to 20th	Day	21% 13% 34% 21% 9% 2	460
	21st to end	Day	21% 16% 29% 26% 6% 2	506
April	1st to 10th	Day	22% 14% 32% 21% 11% 1	460
	11th to 20th	Day	21% 16% 28% 25% 7% 3	452
	21st to end	Day	24% 15% 35% 18% 7% 1	460
May	1st to 10th	Day	23% 13% 28% 24% 9% 3	463
	11th to 20th	Day	21% 12% 29% 22% 14% 3	487
	21st to end	Day	23% 15% 31% 25% 6% 1	572
June	1st to 10th	Day	24% 9% 30% 26% 11% 1	680
	11th to 20th	Day	19% 12% 29% 24% 14% 2	701
	21st to end	Day	22% 8% 28% 27% 12% 2	870
July	1st to 10th	Day	22% 9% 27% 29% 10% 3	605
	11th to 20th	Day	20% 9% 29% 26% 11% 5%	484
	21st to end	Day	19% 8% 27% 26% 15% 5%	532
August	1st to 10th	Day	18% 9% 27% 24% 16% 5%	486
	11th to 20th	Day	20% 6% 26% 23% 16% 9%	479
	21st to end	Day	22% 9% 27% 23% 12% 8%	539
September	1st to 10th	Day	23% 11% 32% 19% 10% 5%	490
	11th to 20th	Day	19% 9% 32% 25% 12% 4	490
	21st to end	Day	27% 14% 20% 22% 11% 5%	490
October	1st to 10th	Day	27% 13% 28% 18% 11% 3	490
	11th to 20th	Day	34% 15% 26% 17% 5% 2	438
	21st to end	Day	33% 13% 27% 20% 6% 1	429
November	1st to 10th	Day	32% 16% 32% 16% 3 1	355
	11th to 20th	Day	28% 16% 29% 18% 9% 1	200
	21st to end	Day	35% 15% 29% 15% 5% 2	200
December	1st to 10th	Day	21% 11% 25% 26% 14% 4	190
	11th to 20th	Day	25% 15% 31% 20% 5% 4	180
	21st to end	Day	22% 12% 32% 21% 11% 2	198
January	1st to 10th	Night	21% 12% 35% 24% 8%	760
	11th to 20th	Night	22% 12% 31% 26% 8% 1	760
	21st to end	Night	13% 8% 33% 33% 12% 1	836
February	1st to 10th	Night	13% 10% 35% 30% 10% 2	760
	11th to 20th	Night	17% 13% 34% 28% 7% 1	743
	21st to end	Night	18% 14% 33% 26% 8% 2	628
March	1st to 10th	Night	17% 12% 35% 27% 9%	760
	11th to 20th	Night	20% 15% 28% 28% 7% 2	760
	21st to end	Night	21% 13% 34% 26% 5% 1	836
April	1st to 10th	Night	26% 10% 31% 27% 6%	760
	11th to 20th	Night	21% 13% 29% 29% 8%	713
	21st to end	Night	24% 13% 33% 24% 6%	489
May	1st to 10th	Night	25% 10% 28% 26% 11% 1	380
	11th to 20th	Night	21% 10% 28% 29% 11% 1	374
	21st to end	Night	27% 9% 30% 25% 8% 1	411
June	1st to 10th	Night	23% 7% 32% 30% 8% 1	380
	11th to 20th	Night	19% 8% 32% 30% 11%	380
	21st to end	Night	20% 6% 25% 36% 13% 1	380
July	1st to 10th	Night	24% 5% 29% 33% 9% 1	370
	11th to 20th	Night	17% 7% 28% 34% 14% 1	368
	21st to end	Night	18% 7% 22% 34% 17% 1	416
August	1st to 10th	Night	19% 4 25% 29% 22% 1	378
	11th to 20th	Night	20% 4 25% 31% 19% 2	381
	21st to end	Night	21% 8% 25% 27% 15% 3	810
September	1st to 10th	Night	24% 7% 28% 27% 13% 2	760
	11th to 20th	Night	24% 10% 27% 27% 11% 3	760
	21st to end	Night	27% 6% 29% 27% 10% 1	760
October	1st to 10th	Night	25% 10% 32% 23% 8% 1	760
	11th to 20th	Night	36% 12% 24% 20% 7% 1	760
	21st to end	Night	35% 10% 29% 20% 6% 1	836
November	1st to 10th	Night	33% 14% 26% 20% 6% 1	780
	11th to 20th	Night	26% 17% 29% 21% 7% 1	800
	21st to end	Night	30% 14% 30% 19% 6% 1	875
December	1st to 10th	Night	25% 12% 29% 22% 11% 2	878
	11th to 20th	Night	22% 13% 33% 21% 9% 2	850
	21st to end	Night	24% 14% 29% 26% 6% 1	920

Page generated at 2024-12-03 06:45:13. Version ac07

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