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 2024-05-13.

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 7% 5% 5% 5% 4 6% 7% 34%	83079
	Night	14% 11% 4 8% 5% 5% 5% 4 5% 6% 35%	86433
Transparency	Day	48% 9% 13% 19% 9% 1	82778
	Night	49% 8% 13% 19% 10% 1	86269
Seeing	Day	20% 17% 32% 21% 8% 2	14766
	Night	19% 12% 30% 29% 9% 1	23236

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% 14% 5% 8% 5% 4 4 4 5% 7% 32%	2424
	11th to 20th	Day	8% 11% 4 10% 6% 6% 6% 4 5% 6% 33%	2520
	21st to end	Day	6% 7% 4 11% 6% 5% 6% 4 6% 7% 38%	2772
February	1st to 10th	Day	6% 11% 4 9% 9% 6% 7% 4 7% 6% 31%	1539
	11th to 20th	Day	8% 12% 4 13% 8% 5% 5% 3 5% 6% 31%	1783
	21st to end	Day	10% 11% 3 8% 6% 5% 6% 5% 6% 6% 34%	1570
March	1st to 10th	Day	14% 11% 4 9% 6% 4 5% 4 5% 6% 32%	3116
	11th to 20th	Day	11% 17% 5% 9% 6% 5% 4 4 6% 6% 29%	3371
	21st to end	Day	11% 15% 4 9% 5% 4 4 3 4 5% 36%	3992
April	1st to 10th	Day	18% 14% 3 8% 5% 4 4 4 5% 5% 29%	2280
	11th to 20th	Day	15% 9% 2 7% 5% 4 5% 3 5% 5% 39%	2387
	21st to end	Day	20% 11% 2 6% 5% 4 4 4 5% 5% 34%	2470
May	1st to 10th	Day	20% 8% 3 6% 5% 5% 4 4 5% 7% 34%	2507
	11th to 20th	Day	17% 7% 3 6% 5% 5% 6% 4 5% 5% 36%	2509
	21st to end	Day	16% 7% 2 6% 5% 4 5% 6% 5% 8% 36%	2871
June	1st to 10th	Day	19% 7% 3 6% 6% 6% 6% 5% 7% 7% 30%	2700
	11th to 20th	Day	18% 6% 2 6% 5% 6% 5% 5% 6% 6% 35%	2700
	21st to end	Day	22% 8% 3 6% 5% 5% 5% 5% 6% 8% 29%	2700
July	1st to 10th	Day	14% 6% 2 7% 6% 5% 6% 4 8% 9% 33%	2692
	11th to 20th	Day	11% 6% 3 7% 7% 6% 6% 6% 7% 8% 33%	2520
	21st to end	Day	12% 6% 2 6% 5% 6% 6% 5% 7% 10% 33%	2744
August	1st to 10th	Day	13% 6% 2 7% 6% 7% 7% 5% 8% 9% 29%	2481
	11th to 20th	Day	11% 6% 3 6% 6% 6% 6% 5% 6% 9% 37%	2304
	21st to end	Day	11% 5% 2 6% 5% 5% 5% 4 8% 8% 40%	2524
September	1st to 10th	Day	13% 5% 2 6% 5% 5% 5% 4 5% 8% 42%	2156
	11th to 20th	Day	14% 5% 2 6% 4 4 4 3 6% 6% 46%	1980
	21st to end	Day	18% 4 2 5% 4 4 4 4 5% 7% 41%	1980
October	1st to 10th	Day	17% 7% 2 7% 5% 5% 5% 3 5% 6% 40%	1972
	11th to 20th	Day	20% 8% 2 7% 6% 5% 6% 4 6% 5% 30%	1648
	21st to end	Day	21% 11% 3 8% 4 4 4 3 5% 7% 31%	1782
November	1st to 10th	Day	13% 10% 3 9% 5% 5% 4 3 6% 5% 36%	1671
	11th to 20th	Day	15% 11% 4 8% 5% 6% 4 5% 5% 7% 31%	1639
	21st to end	Day	15% 14% 4 9% 6% 5% 4 4 5% 6% 29%	1346
December	1st to 10th	Day	15% 14% 5% 9% 6% 6% 4 4 4 4 28%	1330
	11th to 20th	Day	17% 12% 4 9% 5% 5% 5% 3 3 4 33%	1668
	21st to end	Day	16% 14% 3 8% 4 4 3 3 3 4 36%	2431
January	1st to 10th	Night	9% 14% 6% 10% 6% 6% 5% 4 5% 5% 29%	4523
	11th to 20th	Night	8% 12% 5% 10% 7% 6% 5% 4 5% 6% 32%	4440
	21st to end	Night	6% 11% 6% 13% 6% 6% 5% 4 5% 7% 31%	4884
February	1st to 10th	Night	6% 10% 3 9% 7% 5% 5% 4 5% 7% 38%	2641
	11th to 20th	Night	7% 12% 5% 11% 7% 5% 5% 3 6% 5% 33%	2280
	21st to end	Night	11% 12% 4 7% 5% 5% 4 4 6% 7% 35%	1884
March	1st to 10th	Night	15% 15% 4 9% 5% 4 5% 4 4 5% 30%	3724
	11th to 20th	Night	10% 15% 4 12% 7% 6% 6% 4 5% 6% 26%	3587
	21st to end	Night	13% 15% 4 8% 5% 4 4 3 4 5% 35%	3636
April	1st to 10th	Night	17% 15% 4 7% 4 4 4 2 5% 5% 33%	1900
	11th to 20th	Night	17% 8% 3 7% 5% 4 6% 3 4 8% 35%	1741
	21st to end	Night	21% 11% 3 6% 4 3 4 4 5% 5% 36%	1710
May	1st to 10th	Night	21% 9% 3 6% 5% 4 4 3 4 5% 36%	1689
	11th to 20th	Night	21% 7% 2 6% 4 4 4 5% 5% 6% 37%	1439
	21st to end	Night	20% 8% 3 5% 4 3 4 4 5% 5% 39%	1404
June	1st to 10th	Night	18% 9% 3 7% 5% 4 4 4 5% 7% 33%	1260
	11th to 20th	Night	15% 6% 2 5% 5% 5% 4 4 6% 7% 41%	1260
	21st to end	Night	19% 8% 3 8% 5% 5% 5% 4 6% 5% 33%	1260
July	1st to 10th	Night	17% 6% 2 5% 4 4 4 4 7% 5% 41%	1264
	11th to 20th	Night	11% 6% 3 6% 5% 5% 6% 4 7% 8% 39%	1440
	21st to end	Night	13% 5% 2 4 5% 5% 5% 5% 7% 9% 40%	1574
August	1st to 10th	Night	12% 4 2 6% 4 4 5% 4 7% 9% 43%	1440
	11th to 20th	Night	15% 5% 2 6% 5% 6% 5% 5% 7% 7% 38%	1596
	21st to end	Night	13% 6% 2 6% 3 5% 4 2 5% 9% 46%	1830
September	1st to 10th	Night	14% 5% 1 5% 5% 4 4 3 5% 7% 47%	1804
	11th to 20th	Night	16% 6% 2 6% 3 5% 3 4 5% 6% 44%	1980
	21st to end	Night	16% 7% 2 6% 3 4 4 3 4 6% 45%	1980
October	1st to 10th	Night	14% 7% 3 5% 4 4 4 3 5% 6% 45%	1988
	11th to 20th	Night	21% 9% 2 6% 3 4 5% 3 4 6% 36%	2308
	21st to end	Night	20% 9% 3 6% 4 4 4 3 5% 7% 36%	2574
November	1st to 10th	Night	14% 9% 2 7% 5% 4 4 5% 5% 7% 39%	2407
	11th to 20th	Night	16% 9% 3 7% 4 4 4 4 5% 6% 36%	2538
	21st to end	Night	14% 12% 4 7% 6% 4 4 3 5% 6% 33%	2831
December	1st to 10th	Night	14% 15% 4 10% 6% 5% 5% 3 4 4 31%	2850
	11th to 20th	Night	16% 11% 3 8% 6% 4 4 4 6% 5% 32%	3531
	21st to end	Night	16% 16% 4 8% 5% 4 3 2 4 4 34%	5236

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	50% 8% 15% 21% 6%	2425
	11th to 20th	Day	50% 7% 10% 23% 9% 1	2520
	21st to end	Day	43% 10% 12% 19% 15% 1	2772
February	1st to 10th	Day	50% 8% 11% 16% 12% 2	1539
	11th to 20th	Day	54% 7% 11% 15% 11% 2	1791
	21st to end	Day	48% 9% 9% 18% 13% 3	1570
March	1st to 10th	Day	52% 10% 12% 13% 10% 3	3119
	11th to 20th	Day	54% 9% 14% 13% 8% 1	3371
	21st to end	Day	51% 6% 9% 17% 13% 5%	3992
April	1st to 10th	Day	55% 8% 10% 13% 11% 3	2280
	11th to 20th	Day	46% 6% 12% 21% 11% 3	2387
	21st to end	Day	52% 7% 10% 16% 12% 2	2470
May	1st to 10th	Day	48% 8% 13% 16% 13% 2	2507
	11th to 20th	Day	48% 8% 12% 21% 10% 1	2513
	21st to end	Day	45% 11% 12% 21% 10% 1	2871
June	1st to 10th	Day	49% 12% 13% 18% 8% 1	2700
	11th to 20th	Day	46% 10% 13% 20% 10% 1	2700
	21st to end	Day	51% 12% 13% 16% 8%	2700
July	1st to 10th	Day	42% 12% 18% 21% 7%	2617
	11th to 20th	Day	44% 12% 15% 21% 7%	2445
	21st to end	Day	43% 14% 15% 19% 7%	2591
August	1st to 10th	Day	46% 16% 17% 18% 4	2467
	11th to 20th	Day	39% 14% 20% 20% 7%	2304
	21st to end	Day	38% 12% 18% 24% 9%	2524
September	1st to 10th	Day	39% 10% 17% 22% 12%	2156
	11th to 20th	Day	37% 8% 18% 26% 10% 1	1980
	21st to end	Day	41% 10% 14% 23% 11%	1980
October	1st to 10th	Day	44% 8% 13% 24% 11%	1972
	11th to 20th	Day	52% 11% 15% 17% 4	1648
	21st to end	Day	54% 8% 13% 16% 7% 1	1782
November	1st to 10th	Day	49% 9% 12% 19% 10% 1	1671
	11th to 20th	Day	52% 8% 10% 21% 8% 1	1639
	21st to end	Day	55% 7% 15% 15% 7% 1	1346
December	1st to 10th	Day	59% 7% 9% 17% 8%	1330
	11th to 20th	Day	56% 6% 9% 19% 10% 1	1668
	21st to end	Day	52% 5% 12% 19% 8% 3	2431
January	1st to 10th	Night	55% 8% 12% 14% 9% 1	4523
	11th to 20th	Night	50% 9% 12% 20% 8% 1	4440
	21st to end	Night	49% 8% 12% 18% 12% 1	4884
February	1st to 10th	Night	46% 8% 11% 20% 13% 1	2641
	11th to 20th	Night	53% 6% 11% 16% 14% 1	2283
	21st to end	Night	47% 7% 10% 19% 14% 2	1884
March	1st to 10th	Night	54% 8% 12% 16% 8% 2	3734
	11th to 20th	Night	57% 9% 11% 14% 7% 1	3588
	21st to end	Night	52% 6% 10% 20% 10% 2	3636
April	1st to 10th	Night	54% 4 8% 17% 13% 3	1900
	11th to 20th	Night	47% 8% 9% 22% 13% 1	1741
	21st to end	Night	52% 5% 9% 19% 12% 2	1710
May	1st to 10th	Night	50% 6% 11% 17% 13% 2	1689
	11th to 20th	Night	46% 7% 12% 21% 13% 1	1440
	21st to end	Night	46% 8% 13% 19% 14% 1	1405
June	1st to 10th	Night	49% 8% 15% 20% 8% 1	1260
	11th to 20th	Night	41% 8% 12% 24% 12% 3	1260
	21st to end	Night	51% 10% 12% 17% 10%	1260
July	1st to 10th	Night	42% 9% 18% 24% 7%	1229
	11th to 20th	Night	40% 11% 16% 24% 8%	1392
	21st to end	Night	40% 11% 18% 23% 7%	1486
August	1st to 10th	Night	37% 12% 20% 27% 4	1430
	11th to 20th	Night	41% 13% 19% 18% 9%	1596
	21st to end	Night	37% 10% 15% 31% 8%	1830
September	1st to 10th	Night	37% 9% 16% 25% 12% 1	1804
	11th to 20th	Night	40% 9% 16% 26% 9% 1	1980
	21st to end	Night	40% 8% 13% 26% 12% 1	1980
October	1st to 10th	Night	41% 6% 13% 26% 13% 1	1988
	11th to 20th	Night	49% 8% 14% 23% 6%	2308
	21st to end	Night	49% 9% 14% 19% 9% 1	2574
November	1st to 10th	Night	45% 9% 14% 22% 9% 1	2407
	11th to 20th	Night	48% 8% 13% 20% 10% 1	2538
	21st to end	Night	52% 9% 11% 18% 9% 1	2831
December	1st to 10th	Night	58% 6% 10% 18% 7% 1	2850
	11th to 20th	Night	51% 8% 12% 18% 10% 1	3532
	21st to end	Night	55% 7% 12% 15% 9% 2	5236

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	17% 16% 38% 24% 4 1	180
	11th to 20th	Day	22% 19% 38% 14% 7%	180
	21st to end	Day	14% 21% 37% 20% 7% 1	198
February	1st to 10th	Day	16% 26% 38% 15% 5% 1	199
	11th to 20th	Day	16% 21% 39% 19% 5%	424
	21st to end	Day	17% 22% 36% 19% 4 1	382
March	1st to 10th	Day	22% 21% 32% 19% 5%	460
	11th to 20th	Day	18% 23% 31% 19% 8%	460
	21st to end	Day	22% 25% 28% 17% 7% 1	506
April	1st to 10th	Day	27% 22% 28% 17% 5% 1	460
	11th to 20th	Day	23% 20% 33% 18% 5% 2	452
	21st to end	Day	26% 18% 37% 13% 3 2	460
May	1st to 10th	Day	26% 14% 32% 19% 8% 1	463
	11th to 20th	Day	19% 21% 30% 20% 7% 2	456
	21st to end	Day	21% 17% 33% 21% 7% 1	631
June	1st to 10th	Day	24% 14% 30% 23% 8% 1	630
	11th to 20th	Day	21% 17% 27% 22% 12% 1	630
	21st to end	Day	23% 11% 30% 24% 10% 1	630
July	1st to 10th	Day	16% 11% 34% 27% 11% 1	612
	11th to 20th	Day	12% 13% 38% 26% 9% 2	444
	21st to end	Day	13% 12% 36% 29% 9% 1	488
August	1st to 10th	Day	13% 14% 34% 24% 12% 2	446
	11th to 20th	Day	13% 9% 33% 30% 12% 3	439
	21st to end	Day	15% 17% 32% 18% 16% 3	495
September	1st to 10th	Day	16% 16% 32% 24% 9% 4	450
	11th to 20th	Day	18% 13% 32% 23% 8% 5%	450
	21st to end	Day	21% 14% 28% 23% 10% 4	450
October	1st to 10th	Day	17% 19% 29% 23% 9% 2	446
	11th to 20th	Day	26% 16% 29% 18% 10% 2	360
	21st to end	Day	30% 14% 28% 21% 6% 1	396
November	1st to 10th	Day	25% 17% 31% 21% 5% 1	365
	11th to 20th	Day	21% 18% 28% 24% 9% 1	370
	21st to end	Day	23% 24% 32% 19% 2	196
December	1st to 10th	Day	23% 17% 30% 19% 10% 2	180
	11th to 20th	Day	26% 20% 32% 16% 4 2	180
	21st to end	Day	23% 22% 27% 23% 4 1	198
January	1st to 10th	Night	19% 11% 37% 27% 5% 1	786
	11th to 20th	Night	17% 12% 39% 27% 6%	760
	21st to end	Night	11% 11% 33% 36% 8%	836
February	1st to 10th	Night	12% 12% 40% 28% 8% 1	760
	11th to 20th	Night	15% 15% 40% 23% 7% 1	743
	21st to end	Night	18% 12% 35% 30% 5%	628
March	1st to 10th	Night	19% 16% 33% 26% 6% 1	760
	11th to 20th	Night	17% 16% 36% 23% 7% 1	760
	21st to end	Night	20% 16% 31% 25% 7% 1	836
April	1st to 10th	Night	26% 13% 30% 23% 7% 1	760
	11th to 20th	Night	23% 14% 29% 26% 8%	617
	21st to end	Night	28% 11% 28% 25% 7% 1	570
May	1st to 10th	Night	25% 10% 29% 29% 6% 1	549
	11th to 20th	Night	23% 10% 25% 30% 12%	360
	21st to end	Night	25% 11% 29% 27% 7% 1	389
June	1st to 10th	Night	21% 6% 26% 37% 9% 1	360
	11th to 20th	Night	17% 6% 24% 37% 14% 2	360
	21st to end	Night	21% 5% 27% 34% 13%	360
July	1st to 10th	Night	19% 6% 28% 35% 11% 1	350
	11th to 20th	Night	14% 5% 25% 41% 16% 1	348
	21st to end	Night	15% 3 24% 43% 13% 2	394
August	1st to 10th	Night	14% 5% 19% 43% 19% 1	366
	11th to 20th	Night	15% 6% 21% 38% 18% 1	532
	21st to end	Night	15% 7% 27% 36% 14% 1	642
September	1st to 10th	Night	15% 7% 28% 36% 13% 1	720
	11th to 20th	Night	20% 7% 26% 32% 13% 2	720
	21st to end	Night	18% 8% 26% 33% 13% 1	720
October	1st to 10th	Night	17% 12% 28% 31% 10% 2	720
	11th to 20th	Night	25% 10% 27% 26% 12%	720
	21st to end	Night	25% 10% 29% 27% 8% 1	792
November	1st to 10th	Night	21% 16% 29% 26% 7% 1	740
	11th to 20th	Night	21% 16% 29% 23% 9% 1	793
	21st to end	Night	22% 17% 29% 25% 7% 1	850
December	1st to 10th	Night	22% 14% 31% 25% 8% 1	850
	11th to 20th	Night	20% 17% 30% 26% 7%	850
	21st to end	Night	23% 14% 31% 22% 9% 1	935

Page generated at 2024-05-10 12:39:04. Version ac07

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