Baie-Saint-Paul
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Baie-Saint-Paul clear sky chart from 2005-11-06 to 2025-09-19.

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	14% 9% 3 8% 5% 5% 5% 4 6% 7% 34%	126292
	Night	13% 10% 4 8% 5% 5% 5% 4 5% 6% 35%	122832
Transparency	Day	47% 9% 14% 19% 10% 1	129728
	Night	47% 8% 13% 20% 10% 1	127484
Seeing	Day	20% 17% 32% 22% 8% 2	16628
	Night	19% 11% 30% 29% 9% 1	24832

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	12% 21% 5% 8% 4 4 4 3 5% 5% 28%	3465
	11th to 20th	Day	6% 12% 5% 12% 6% 6% 7% 4 5% 8% 28%	3570
	21st to end	Day	4 5% 3 10% 6% 6% 6% 4 6% 6% 41%	3960
February	1st to 10th	Day	6% 10% 4 9% 9% 6% 7% 4 7% 6% 32%	1620
	11th to 20th	Day	8% 12% 4 13% 8% 5% 5% 3 5% 6% 31%	1880
	21st to end	Day	10% 11% 3 8% 6% 5% 6% 5% 6% 6% 35%	1650
March	1st to 10th	Day	16% 14% 4 10% 6% 4 5% 3 5% 5% 29%	4476
	11th to 20th	Day	9% 13% 4 8% 5% 5% 5% 4 7% 7% 32%	4829
	21st to end	Day	12% 15% 4 9% 5% 5% 5% 3 4 5% 33%	5726
April	1st to 10th	Day	18% 14% 3 8% 5% 4 4 4 5% 5% 30%	2400
	11th to 20th	Day	15% 9% 2 8% 5% 4 5% 3 5% 5% 38%	2514
	21st to end	Day	20% 11% 2 6% 5% 4 5% 3 5% 5% 34%	2600
May	1st to 10th	Day	20% 10% 3 7% 4 5% 4 4 4 6% 33%	5977
	11th to 20th	Day	22% 8% 2 7% 5% 5% 5% 4 5% 6% 31%	6318
	21st to end	Day	17% 8% 3 8% 5% 5% 5% 5% 5% 8% 31%	7333
June	1st to 10th	Day	20% 7% 3 6% 6% 5% 6% 5% 6% 7% 30%	3000
	11th to 20th	Day	17% 6% 2 6% 5% 6% 5% 5% 6% 7% 35%	3000
	21st to end	Day	22% 8% 3 6% 5% 5% 5% 4 5% 8% 29%	3000
July	1st to 10th	Day	15% 6% 2 7% 6% 6% 6% 5% 8% 9% 30%	6784
	11th to 20th	Day	11% 6% 2 7% 6% 5% 7% 6% 8% 9% 32%	6360
	21st to end	Day	10% 5% 2 6% 4 5% 6% 5% 7% 10% 42%	6926
August	1st to 10th	Day	11% 5% 2 7% 5% 6% 7% 5% 8% 10% 32%	4509
	11th to 20th	Day	13% 6% 3 7% 6% 6% 7% 5% 7% 8% 31%	4175
	21st to end	Day	16% 5% 2 6% 4 5% 5% 4 6% 7% 41%	4580
September	1st to 10th	Day	12% 5% 2 6% 5% 5% 5% 4 5% 8% 43%	2395
	11th to 20th	Day	13% 5% 2 5% 4 4 4 3 5% 6% 48%	2178
	21st to end	Day	19% 4 2 6% 4 4 4 4 5% 8% 41%	2090
October	1st to 10th	Day	17% 7% 2 7% 5% 5% 5% 3 5% 6% 39%	2081
	11th to 20th	Day	20% 8% 2 7% 5% 5% 6% 4 7% 6% 31%	1739
	21st to end	Day	20% 10% 3 7% 4 4 4 3 5% 7% 32%	1881
November	1st to 10th	Day	12% 10% 4 9% 5% 5% 4 3 6% 5% 36%	1761
	11th to 20th	Day	15% 11% 4 8% 5% 5% 4 4 5% 7% 32%	1725
	21st to end	Day	16% 15% 4 9% 5% 5% 4 4 5% 6% 28%	1416
December	1st to 10th	Day	11% 14% 5% 9% 4 5% 4 3 4 6% 34%	2280
	11th to 20th	Day	15% 9% 4 9% 6% 5% 5% 4 4 5% 33%	2618
	21st to end	Day	14% 11% 3 9% 5% 5% 5% 4 6% 6% 31%	3476
January	1st to 10th	Night	11% 18% 6% 10% 6% 5% 5% 3 4 5% 28%	6471
	11th to 20th	Night	6% 13% 7% 15% 8% 6% 5% 4 5% 6% 26%	6315
	21st to end	Night	4 8% 4 13% 6% 6% 5% 4 6% 8% 38%	6996
February	1st to 10th	Night	6% 10% 3 10% 6% 5% 5% 4 5% 7% 38%	2779
	11th to 20th	Night	7% 13% 5% 11% 7% 5% 5% 3 6% 5% 33%	2403
	21st to end	Night	10% 12% 4 8% 5% 5% 4 4 6% 7% 36%	1980
March	1st to 10th	Night	16% 14% 4 10% 5% 4 5% 4 5% 5% 27%	5364
	11th to 20th	Night	10% 12% 4 10% 6% 6% 6% 4 6% 8% 28%	5129
	21st to end	Night	14% 16% 4 9% 4 3 4 3 4 4 34%	5202
April	1st to 10th	Night	17% 15% 4 7% 4 4 4 2 5% 4 34%	2000
	11th to 20th	Night	17% 8% 3 8% 5% 4 6% 3 5% 8% 35%	1834
	21st to end	Night	21% 11% 3 6% 4 3 4 4 4 5% 36%	1800
May	1st to 10th	Night	18% 9% 3 7% 6% 4 4 3 5% 6% 35%	3993
	11th to 20th	Night	23% 8% 2 7% 4 4 4 3 5% 7% 32%	3575
	21st to end	Night	17% 8% 3 6% 3 3 4 4 5% 8% 37%	3559
June	1st to 10th	Night	18% 8% 3 7% 5% 4 4 4 5% 7% 34%	1400
	11th to 20th	Night	15% 5% 2 6% 5% 5% 4 4 6% 8% 42%	1400
	21st to end	Night	19% 8% 3 7% 4 5% 5% 4 6% 6% 33%	1400
July	1st to 10th	Night	12% 6% 2 6% 4 5% 6% 4 7% 9% 40%	3190
	11th to 20th	Night	15% 6% 2 6% 4 4 4 4 6% 8% 41%	3600
	21st to end	Night	10% 4 2 4 4 4 4 4 6% 8% 50%	3926
August	1st to 10th	Night	14% 5% 2 6% 4 4 5% 4 6% 7% 41%	2609
	11th to 20th	Night	12% 5% 2 8% 6% 7% 6% 5% 7% 7% 35%	2872
	21st to end	Night	15% 6% 3 7% 3 5% 4 3 4 7% 43%	3316
September	1st to 10th	Night	13% 5% 1 5% 5% 4 4 3 5% 6% 49%	2005
	11th to 20th	Night	15% 6% 2 6% 3 5% 3 4 5% 6% 46%	2179
	21st to end	Night	16% 6% 2 7% 4 4 4 3 4 6% 44%	2090
October	1st to 10th	Night	15% 7% 3 6% 4 4 4 3 5% 6% 44%	2099
	11th to 20th	Night	21% 9% 2 6% 3 4 5% 3 4 6% 36%	2437
	21st to end	Night	19% 9% 3 6% 4 4 4 3 5% 7% 37%	2717
November	1st to 10th	Night	13% 9% 2 7% 5% 4 4 5% 5% 7% 39%	2537
	11th to 20th	Night	16% 9% 3 7% 4 4 4 4 5% 6% 36%	2672
	21st to end	Night	15% 13% 4 7% 6% 4 4 3 5% 6% 32%	2980
December	1st to 10th	Night	10% 12% 5% 12% 6% 5% 4 4 4 6% 33%	4910
	11th to 20th	Night	17% 10% 3 7% 5% 5% 5% 4 6% 7% 32%	5591
	21st to end	Night	14% 14% 5% 9% 5% 5% 5% 4 5% 6% 30%	7502

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% 6% 11% 19% 7%	3466
	11th to 20th	Day	53% 7% 12% 20% 7% 1	3600
	21st to end	Day	39% 9% 10% 19% 23% 1	3960
February	1st to 10th	Day	49% 8% 11% 16% 12% 3	1620
	11th to 20th	Day	54% 7% 12% 15% 11% 2	1888
	21st to end	Day	47% 9% 9% 19% 13% 3	1650
March	1st to 10th	Day	56% 8% 9% 10% 11% 5%	4479
	11th to 20th	Day	47% 10% 18% 15% 8% 1	4829
	21st to end	Day	53% 5% 8% 17% 13% 5%	5726
April	1st to 10th	Day	54% 7% 10% 14% 11% 3	2400
	11th to 20th	Day	46% 6% 12% 21% 12% 3	2514
	21st to end	Day	52% 7% 10% 16% 12% 2	2600
May	1st to 10th	Day	51% 8% 13% 15% 13% 1	5988
	11th to 20th	Day	52% 8% 13% 18% 6% 3	6322
	21st to end	Day	48% 9% 14% 16% 11%	7333
June	1st to 10th	Day	49% 11% 12% 20% 7% 1	3000
	11th to 20th	Day	45% 10% 14% 20% 10% 1	3000
	21st to end	Day	50% 11% 13% 16% 8% 1	3000
July	1st to 10th	Day	46% 9% 16% 21% 8%	6709
	11th to 20th	Day	40% 11% 19% 24% 5%	6285
	21st to end	Day	34% 11% 17% 29% 9%	6728
August	1st to 10th	Day	41% 13% 19% 18% 9%	4495
	11th to 20th	Day	44% 13% 20% 18% 5%	4214
	21st to end	Day	40% 9% 19% 19% 12% 1	4580
September	1st to 10th	Day	38% 10% 17% 23% 12%	2395
	11th to 20th	Day	35% 8% 18% 28% 10%	2178
	21st to end	Day	41% 10% 14% 23% 11%	2090
October	1st to 10th	Day	50% 9% 13% 22% 6%	3458
	11th to 20th	Day	43% 8% 18% 26% 6%	2864
	21st to end	Day	42% 7% 22% 17% 12% 1	3081
November	1st to 10th	Day	48% 9% 12% 20% 9% 1	1761
	11th to 20th	Day	52% 8% 10% 21% 8% 1	1725
	21st to end	Day	57% 7% 14% 15% 6% 1	1416
December	1st to 10th	Day	52% 6% 12% 18% 13%	2280
	11th to 20th	Day	49% 8% 13% 16% 13% 1	2618
	21st to end	Day	50% 10% 13% 17% 9% 2	3476
January	1st to 10th	Night	59% 6% 12% 15% 7% 1	6471
	11th to 20th	Night	57% 8% 12% 15% 6% 1	6360
	21st to end	Night	42% 7% 11% 21% 18% 1	6996
February	1st to 10th	Night	45% 8% 11% 20% 14% 2	2779
	11th to 20th	Night	53% 6% 11% 15% 14% 1	2406
	21st to end	Night	47% 7% 10% 20% 13% 2	1980
March	1st to 10th	Night	56% 7% 10% 12% 13% 2	5374
	11th to 20th	Night	52% 9% 16% 14% 7% 3	5130
	21st to end	Night	53% 5% 8% 20% 13% 2	5202
April	1st to 10th	Night	54% 5% 8% 17% 14% 3	2000
	11th to 20th	Night	47% 8% 10% 21% 13% 1	1834
	21st to end	Night	52% 5% 9% 19% 12% 2	1800
May	1st to 10th	Night	48% 8% 12% 18% 14% 1	3999
	11th to 20th	Night	49% 9% 12% 21% 9% 1	3576
	21st to end	Night	43% 8% 15% 19% 12% 2	3560
June	1st to 10th	Night	48% 8% 14% 22% 8% 1	1400
	11th to 20th	Night	39% 8% 14% 23% 13% 3	1400
	21st to end	Night	51% 10% 12% 17% 10%	1400
July	1st to 10th	Night	38% 8% 24% 26% 5%	3155
	11th to 20th	Night	39% 8% 21% 26% 5%	3552
	21st to end	Night	30% 9% 23% 28% 10%	3809
August	1st to 10th	Night	41% 9% 18% 24% 8%	2599
	11th to 20th	Night	44% 13% 20% 14% 9%	2899
	21st to end	Night	41% 8% 13% 27% 11%	3316
September	1st to 10th	Night	35% 9% 16% 27% 13% 1	2005
	11th to 20th	Night	38% 8% 16% 28% 9% 1	2179
	21st to end	Night	41% 8% 13% 25% 12% 1	2090
October	1st to 10th	Night	44% 7% 13% 28% 8% 1	3502
	11th to 20th	Night	43% 6% 13% 31% 6%	4051
	21st to end	Night	40% 8% 20% 19% 13% 1	4467
November	1st to 10th	Night	44% 9% 14% 23% 9% 1	2537
	11th to 20th	Night	48% 8% 12% 20% 10% 1	2672
	21st to end	Night	53% 9% 11% 18% 8% 1	2980
December	1st to 10th	Night	53% 6% 11% 22% 7%	4910
	11th to 20th	Night	49% 7% 11% 22% 11% 1	5592
	21st to end	Night	53% 8% 13% 16% 9% 1	7502

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% 15% 35% 24% 5% 1	200
	11th to 20th	Day	21% 19% 37% 15% 8% 1	200
	21st to end	Day	13% 20% 38% 21% 7% 1	220
February	1st to 10th	Day	15% 24% 42% 14% 5%	220
	11th to 20th	Day	16% 22% 38% 19% 5%	461
	21st to end	Day	16% 21% 37% 20% 5% 1	414
March	1st to 10th	Day	22% 21% 32% 20% 5%	500
	11th to 20th	Day	18% 21% 34% 19% 8%	500
	21st to end	Day	22% 24% 29% 17% 7% 1	550
April	1st to 10th	Day	26% 23% 28% 17% 5% 1	500
	11th to 20th	Day	21% 20% 33% 19% 6% 2	492
	21st to end	Day	26% 19% 36% 14% 3 2	500
May	1st to 10th	Day	27% 14% 32% 19% 7% 1	503
	11th to 20th	Day	20% 22% 28% 21% 8% 1	527
	21st to end	Day	21% 17% 32% 22% 7% 1	736
June	1st to 10th	Day	24% 14% 30% 24% 8% 1	730
	11th to 20th	Day	19% 17% 28% 22% 12% 1	730
	21st to end	Day	24% 11% 31% 24% 9% 1	730
July	1st to 10th	Day	16% 12% 33% 28% 10% 1	710
	11th to 20th	Day	12% 14% 38% 26% 9% 2	524
	21st to end	Day	12% 12% 36% 30% 8% 1	576
August	1st to 10th	Day	13% 13% 33% 25% 13% 3	526
	11th to 20th	Day	13% 9% 32% 30% 13% 3	519
	21st to end	Day	15% 17% 31% 19% 16% 3	583
September	1st to 10th	Day	15% 15% 31% 25% 9% 4	530
	11th to 20th	Day	16% 12% 30% 25% 11% 6%	522
	21st to end	Day	21% 14% 27% 23% 12% 5%	490
October	1st to 10th	Day	18% 19% 29% 23% 10% 2	485
	11th to 20th	Day	25% 16% 30% 18% 10% 2	390
	21st to end	Day	28% 14% 30% 21% 6% 1	429
November	1st to 10th	Day	25% 18% 31% 21% 5% 1	395
	11th to 20th	Day	22% 18% 27% 25% 9% 1	400
	21st to end	Day	27% 23% 30% 18% 2	216
December	1st to 10th	Day	23% 17% 30% 19% 11% 2	200
	11th to 20th	Day	26% 20% 33% 15% 6% 2	200
	21st to end	Day	22% 21% 27% 24% 5% 1	220
January	1st to 10th	Night	20% 11% 36% 27% 5% 1	828
	11th to 20th	Night	16% 12% 38% 26% 7%	800
	21st to end	Night	11% 10% 33% 37% 8%	880
February	1st to 10th	Night	12% 11% 41% 28% 8% 1	800
	11th to 20th	Night	16% 14% 40% 23% 7% 1	783
	21st to end	Night	18% 12% 34% 30% 6%	660
March	1st to 10th	Night	19% 16% 33% 27% 5% 1	800
	11th to 20th	Night	16% 16% 36% 24% 7% 1	800
	21st to end	Night	20% 16% 31% 25% 7% 1	880
April	1st to 10th	Night	26% 14% 31% 23% 6% 1	800
	11th to 20th	Night	22% 13% 31% 26% 8%	650
	21st to end	Night	28% 11% 29% 24% 7% 1	600
May	1st to 10th	Night	25% 10% 30% 29% 6% 1	578
	11th to 20th	Night	23% 10% 24% 30% 12%	394
	21st to end	Night	24% 11% 29% 29% 7% 1	433
June	1st to 10th	Night	20% 7% 26% 37% 10% 1	400
	11th to 20th	Night	17% 6% 25% 36% 15% 2	400
	21st to end	Night	21% 5% 29% 33% 12%	400
July	1st to 10th	Night	18% 7% 27% 38% 10% 1	390
	11th to 20th	Night	14% 5% 24% 42% 15% 1	388
	21st to end	Night	14% 3 24% 45% 13% 1	438
August	1st to 10th	Night	13% 5% 18% 45% 18% 1	408
	11th to 20th	Night	14% 6% 21% 40% 19% 1	592
	21st to end	Night	16% 6% 26% 35% 15% 1	714
September	1st to 10th	Night	14% 7% 28% 36% 13% 1	800
	11th to 20th	Night	19% 6% 24% 33% 16% 2	793
	21st to end	Night	18% 8% 26% 34% 13% 1	760
October	1st to 10th	Night	18% 12% 27% 30% 11% 2	760
	11th to 20th	Night	25% 10% 27% 26% 12%	760
	21st to end	Night	24% 11% 29% 27% 8%	836
November	1st to 10th	Night	22% 15% 29% 26% 7% 1	780
	11th to 20th	Night	21% 17% 29% 24% 9% 1	837
	21st to end	Night	24% 16% 29% 24% 7% 1	900
December	1st to 10th	Night	21% 13% 31% 26% 8% 1	900
	11th to 20th	Night	20% 17% 30% 26% 7%	900
	21st to end	Night	23% 14% 31% 22% 9% 1	990

Page generated at 2025-09-16 01:49:10. Version ac07

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