Mauricie
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Mauricie 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	17% 10% 4 8% 5% 5% 5% 4 5% 6% 31%	130871
	Night	16% 11% 4 9% 5% 5% 5% 3 5% 6% 31%	130598
Transparency	Day	52% 6% 12% 19% 10% 1	134317
	Night	53% 6% 12% 19% 10% 1	135240
Seeing	Day	24% 16% 31% 19% 7% 2	16132
	Night	23% 11% 31% 26% 8% 1	25270

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% 16% 6% 12% 5% 5% 5% 4 4 5% 25%	4661
	11th to 20th	Day	11% 16% 8% 16% 7% 5% 4 3 4 5% 22%	4650
	21st to end	Day	7% 10% 6% 13% 6% 6% 5% 4 6% 7% 30%	5124
February	1st to 10th	Day	12% 16% 5% 13% 7% 6% 4 3 4 5% 27%	1757
	11th to 20th	Day	12% 17% 5% 11% 6% 4 4 3 5% 6% 27%	1969
	21st to end	Day	14% 16% 5% 10% 7% 4 5% 3 4 5% 28%	1730
March	1st to 10th	Day	21% 16% 4 11% 6% 4 4 2 4 3 24%	4576
	11th to 20th	Day	13% 14% 4 9% 5% 5% 4 3 5% 6% 32%	4721
	21st to end	Day	17% 15% 3 8% 5% 5% 4 3 3 4 33%	5970
April	1st to 10th	Day	22% 14% 3 7% 5% 4 4 3 4 5% 30%	2400
	11th to 20th	Day	21% 9% 3 6% 5% 4 4 4 5% 5% 35%	2399
	21st to end	Day	21% 11% 3 7% 5% 5% 4 4 5% 6% 30%	2600
May	1st to 10th	Day	28% 8% 2 6% 5% 4 4 3 4 6% 28%	6244
	11th to 20th	Day	22% 7% 3 7% 4 4 4 3 5% 7% 34%	6318
	21st to end	Day	22% 9% 3 8% 5% 5% 5% 4 5% 6% 28%	6949
June	1st to 10th	Day	21% 7% 3 7% 7% 6% 6% 4 5% 7% 27%	2800
	11th to 20th	Day	18% 7% 3 6% 6% 5% 5% 4 7% 8% 33%	2800
	21st to end	Day	23% 9% 3 8% 5% 5% 5% 4 6% 6% 26%	2800
July	1st to 10th	Day	16% 7% 3 8% 6% 6% 6% 4 7% 8% 29%	6360
	11th to 20th	Day	14% 6% 2 7% 6% 5% 6% 5% 7% 9% 32%	6360
	21st to end	Day	10% 5% 2 6% 4 5% 5% 5% 7% 9% 41%	6926
August	1st to 10th	Day	14% 5% 3 7% 5% 6% 6% 5% 9% 9% 30%	4563
	11th to 20th	Day	19% 7% 3 6% 5% 4 6% 4 6% 8% 32%	4254
	21st to end	Day	18% 6% 3 7% 4 4 5% 3 6% 8% 36%	4312
September	1st to 10th	Day	15% 5% 2 6% 4 4 4 4 6% 7% 42%	2400
	11th to 20th	Day	15% 6% 2 5% 4 4 4 3 5% 7% 45%	2285
	21st to end	Day	20% 8% 3 5% 4 4 4 3 4 7% 40%	2200
October	1st to 10th	Day	21% 7% 3 6% 5% 4 4 3 5% 6% 36%	2106
	11th to 20th	Day	21% 9% 3 8% 6% 5% 5% 4 5% 6% 27%	1900
	21st to end	Day	27% 11% 2 7% 4 4 4 3 5% 6% 27%	1980
November	1st to 10th	Day	17% 13% 4 8% 5% 5% 5% 3 5% 4 31%	1851
	11th to 20th	Day	20% 14% 4 8% 5% 4 4 4 5% 5% 28%	1806
	21st to end	Day	21% 17% 5% 7% 6% 4 4 4 4 5% 23%	1680
December	1st to 10th	Day	19% 17% 6% 11% 6% 5% 4 2 4 4 22%	2486
	11th to 20th	Day	19% 13% 5% 10% 5% 4 4 3 5% 5% 27%	2886
	21st to end	Day	19% 15% 5% 10% 6% 4 4 3 4 4 26%	4048
January	1st to 10th	Night	12% 17% 7% 14% 6% 5% 4 4 5% 5% 21%	8234
	11th to 20th	Night	10% 19% 7% 16% 7% 5% 5% 3 4 5% 20%	8235
	21st to end	Night	7% 11% 5% 13% 8% 7% 6% 4 6% 6% 27%	9057
February	1st to 10th	Night	11% 14% 5% 10% 6% 5% 5% 4 5% 6% 30%	2861
	11th to 20th	Night	11% 14% 5% 12% 6% 6% 4 3 4 6% 28%	2536
	21st to end	Night	14% 12% 5% 9% 6% 5% 4 4 5% 5% 31%	2076
March	1st to 10th	Night	22% 14% 3 12% 6% 4 5% 3 4 4 24%	5484
	11th to 20th	Night	15% 14% 4 9% 5% 4 5% 4 5% 7% 28%	5377
	21st to end	Night	16% 11% 4 9% 6% 5% 5% 4 5% 6% 31%	4962
April	1st to 10th	Night	22% 12% 4 6% 4 4 4 3 5% 5% 32%	2000
	11th to 20th	Night	19% 9% 3 7% 4 4 4 4 5% 6% 35%	1948
	21st to end	Night	23% 10% 2 7% 4 3 4 3 4 6% 35%	1800
May	1st to 10th	Night	25% 9% 3 7% 5% 5% 4 4 5% 6% 29%	3740
	11th to 20th	Night	25% 6% 3 6% 4 4 4 3 5% 7% 34%	3575
	21st to end	Night	20% 8% 3 8% 5% 5% 5% 3 5% 7% 30%	3926
June	1st to 10th	Night	20% 7% 2 6% 4 4 5% 3 6% 8% 35%	1600
	11th to 20th	Night	19% 6% 2 6% 5% 4 4 5% 6% 7% 35%	1600
	21st to end	Night	20% 7% 3 7% 5% 5% 4 4 6% 7% 33%	1600
July	1st to 10th	Night	12% 6% 2 7% 5% 6% 6% 5% 8% 9% 34%	3600
	11th to 20th	Night	15% 6% 2 6% 4 4 5% 4 6% 7% 40%	3600
	21st to end	Night	11% 4 2 5% 4 4 6% 4 6% 8% 47%	3926
August	1st to 10th	Night	13% 6% 2 7% 5% 5% 5% 4 6% 8% 38%	2586
	11th to 20th	Night	17% 7% 3 7% 5% 4 4 4 5% 6% 39%	2745
	21st to end	Night	17% 6% 3 8% 5% 4 4 3 5% 6% 39%	3585
September	1st to 10th	Night	13% 6% 2 6% 4 4 4 4 5% 6% 47%	2000
	11th to 20th	Night	15% 5% 2 4 3 3 3 4 5% 6% 50%	2115
	21st to end	Night	18% 6% 1 5% 4 4 4 3 5% 7% 45%	2200
October	1st to 10th	Night	18% 9% 2 6% 4 3 4 3 4 5% 42%	2290
	11th to 20th	Night	21% 8% 2 7% 4 3 4 3 5% 6% 35%	2500
	21st to end	Night	24% 9% 3 7% 5% 4 4 3 4 7% 30%	2860
November	1st to 10th	Night	19% 10% 3 8% 5% 4 4 3 5% 6% 32%	2667
	11th to 20th	Night	19% 10% 3 8% 5% 4 5% 4 6% 6% 30%	2809
	21st to end	Night	22% 15% 4 8% 4 4 4 3 4 5% 26%	2940
December	1st to 10th	Night	15% 14% 6% 10% 6% 5% 5% 4 6% 7% 23%	4909
	11th to 20th	Night	23% 12% 4 9% 6% 5% 5% 3 4 4 26%	5505
	21st to end	Night	21% 16% 6% 10% 4 3 3 2 3 4 28%	7150

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	60% 6% 10% 16% 7%	4662
	11th to 20th	Day	64% 4 9% 14% 8% 1	4680
	21st to end	Day	54% 5% 8% 18% 15% 1	5124
February	1st to 10th	Day	61% 4 8% 16% 9% 2	1757
	11th to 20th	Day	57% 5% 12% 14% 11% 1	1978
	21st to end	Day	60% 4 8% 15% 10% 3	1730
March	1st to 10th	Day	64% 6% 7% 11% 10% 3	4579
	11th to 20th	Day	53% 6% 16% 12% 11% 2	4721
	21st to end	Day	55% 4 7% 15% 16% 3	5970
April	1st to 10th	Day	57% 5% 9% 14% 12% 3	2400
	11th to 20th	Day	50% 5% 9% 20% 12% 3	2399
	21st to end	Day	55% 5% 9% 16% 13% 3	2600
May	1st to 10th	Day	56% 5% 10% 16% 12% 1	6255
	11th to 20th	Day	49% 8% 16% 18% 8% 2	6322
	21st to end	Day	55% 6% 10% 13% 13% 3	6949
June	1st to 10th	Day	54% 8% 9% 17% 10% 2	2800
	11th to 20th	Day	47% 7% 13% 20% 11% 2	2800
	21st to end	Day	57% 7% 10% 15% 10% 1	2800
July	1st to 10th	Day	50% 6% 14% 23% 7%	6290
	11th to 20th	Day	44% 8% 17% 25% 6%	6285
	21st to end	Day	38% 7% 18% 30% 8%	6728
August	1st to 10th	Day	45% 9% 18% 20% 7%	4549
	11th to 20th	Day	47% 8% 18% 21% 6%	4296
	21st to end	Day	45% 6% 15% 19% 13% 1	4312
September	1st to 10th	Day	40% 7% 18% 24% 11% 1	2400
	11th to 20th	Day	38% 7% 15% 29% 10% 1	2285
	21st to end	Day	46% 6% 13% 25% 10%	2200
October	1st to 10th	Day	47% 6% 13% 27% 7%	3431
	11th to 20th	Day	50% 6% 17% 23% 4	3077
	21st to end	Day	48% 6% 20% 19% 7% 1	3180
November	1st to 10th	Day	55% 6% 12% 18% 8% 1	1851
	11th to 20th	Day	58% 5% 11% 17% 9%	1806
	21st to end	Day	63% 6% 10% 15% 5%	1680
December	1st to 10th	Day	67% 3 10% 15% 5%	2486
	11th to 20th	Day	58% 4 9% 18% 12%	2887
	21st to end	Day	62% 5% 8% 15% 11%	4048
January	1st to 10th	Night	64% 6% 10% 14% 5%	8234
	11th to 20th	Night	68% 5% 8% 13% 5%	8280
	21st to end	Night	56% 5% 10% 16% 14%	9057
February	1st to 10th	Night	55% 6% 10% 18% 10% 1	2861
	11th to 20th	Night	58% 5% 9% 16% 10% 1	2538
	21st to end	Night	54% 6% 7% 18% 13% 2	2076
March	1st to 10th	Night	64% 5% 8% 11% 11% 2	5494
	11th to 20th	Night	55% 5% 14% 15% 10% 1	5378
	21st to end	Night	53% 5% 7% 22% 11% 2	4962
April	1st to 10th	Night	53% 5% 9% 15% 15% 2	2000
	11th to 20th	Night	47% 6% 9% 21% 14% 2	1948
	21st to end	Night	51% 5% 8% 20% 15% 2	1800
May	1st to 10th	Night	57% 5% 10% 17% 10% 1	3746
	11th to 20th	Night	49% 8% 12% 19% 10% 2	3576
	21st to end	Night	52% 5% 13% 14% 14% 2	3927
June	1st to 10th	Night	47% 8% 12% 20% 12% 1	1600
	11th to 20th	Night	45% 8% 13% 19% 12% 4	1600
	21st to end	Night	49% 9% 12% 17% 13% 1	1600
July	1st to 10th	Night	44% 7% 23% 21% 6%	3560
	11th to 20th	Night	41% 7% 20% 27% 6%	3552
	21st to end	Night	35% 6% 19% 30% 10%	3809
August	1st to 10th	Night	43% 7% 17% 24% 9%	2576
	11th to 20th	Night	44% 6% 20% 22% 7%	2769
	21st to end	Night	46% 6% 13% 23% 11%	3585
September	1st to 10th	Night	36% 8% 17% 26% 12% 1	2000
	11th to 20th	Night	35% 7% 16% 32% 9% 1	2115
	21st to end	Night	41% 6% 11% 29% 13%	2200
October	1st to 10th	Night	48% 5% 13% 25% 9%	3745
	11th to 20th	Night	43% 6% 15% 29% 7%	4062
	21st to end	Night	46% 5% 18% 19% 11% 1	4610
November	1st to 10th	Night	51% 7% 14% 20% 7% 1	2667
	11th to 20th	Night	54% 6% 12% 19% 9% 1	2809
	21st to end	Night	60% 5% 12% 15% 7%	2940
December	1st to 10th	Night	60% 5% 15% 15% 5%	4909
	11th to 20th	Night	61% 5% 7% 18% 8%	5505
	21st to end	Night	62% 4 7% 15% 11% 1	7150

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	25% 20% 36% 15% 4	220
	11th to 20th	Day	26% 18% 37% 14% 5%	220
	21st to end	Day	18% 17% 38% 20% 7%	242
February	1st to 10th	Day	23% 27% 37% 10% 2	261
	11th to 20th	Day	24% 27% 35% 13% 2	457
	21st to end	Day	25% 21% 36% 15% 4	446
March	1st to 10th	Day	26% 19% 33% 18% 4	540
	11th to 20th	Day	27% 20% 34% 14% 4 1	528
	21st to end	Day	27% 25% 25% 16% 5% 2	550
April	1st to 10th	Day	33% 15% 29% 17% 6%	500
	11th to 20th	Day	29% 20% 27% 16% 5% 2	492
	21st to end	Day	32% 17% 35% 11% 4 1	500
May	1st to 10th	Day	30% 17% 31% 16% 5% 1	503
	11th to 20th	Day	21% 19% 30% 22% 6% 1	527
	21st to end	Day	25% 18% 32% 17% 6% 1	573
June	1st to 10th	Day	22% 15% 37% 19% 6% 1	530
	11th to 20th	Day	22% 16% 32% 19% 10% 1	530
	21st to end	Day	27% 15% 30% 20% 7% 1	530
July	1st to 10th	Day	19% 11% 37% 23% 10% 2	525
	11th to 20th	Day	17% 10% 36% 28% 7% 2	524
	21st to end	Day	16% 11% 32% 28% 11% 2	576
August	1st to 10th	Day	14% 10% 31% 29% 14% 2	526
	11th to 20th	Day	17% 6% 29% 30% 14% 4	519
	21st to end	Day	18% 14% 27% 22% 14% 5%	583
September	1st to 10th	Day	18% 14% 32% 21% 11% 5%	530
	11th to 20th	Day	16% 11% 27% 26% 14% 6%	530
	21st to end	Day	24% 13% 27% 20% 11% 5%	530
October	1st to 10th	Day	24% 15% 29% 20% 10% 2	530
	11th to 20th	Day	26% 17% 29% 18% 8% 1	475
	21st to end	Day	34% 13% 30% 18% 5%	462
November	1st to 10th	Day	29% 16% 30% 18% 5% 1	425
	11th to 20th	Day	31% 15% 30% 18% 6% 1	346
	21st to end	Day	29% 21% 31% 15% 2 1	220
December	1st to 10th	Day	32% 13% 33% 15% 5% 1	220
	11th to 20th	Day	32% 21% 30% 14% 3	220
	21st to end	Day	29% 20% 33% 12% 4 2	242
January	1st to 10th	Night	26% 12% 36% 22% 4	840
	11th to 20th	Night	28% 15% 33% 19% 6%	840
	21st to end	Night	16% 11% 36% 31% 5%	924
February	1st to 10th	Night	19% 12% 37% 26% 5% 1	840
	11th to 20th	Night	20% 17% 39% 20% 4	823
	21st to end	Night	22% 13% 34% 26% 5%	692
March	1st to 10th	Night	25% 14% 33% 24% 3	840
	11th to 20th	Night	25% 15% 33% 20% 5% 1	829
	21st to end	Night	23% 15% 34% 21% 7% 1	880
April	1st to 10th	Night	30% 13% 29% 22% 6%	800
	11th to 20th	Night	25% 14% 32% 23% 6%	764
	21st to end	Night	29% 14% 33% 19% 5%	600
May	1st to 10th	Night	29% 13% 29% 24% 5% 1	468
	11th to 20th	Night	23% 10% 31% 27% 9%	394
	21st to end	Night	21% 9% 36% 25% 9%	433
June	1st to 10th	Night	25% 6% 28% 35% 6%	400
	11th to 20th	Night	21% 7% 25% 37% 10% 1	400
	21st to end	Night	23% 6% 27% 33% 11%	400
July	1st to 10th	Night	14% 6% 31% 37% 12%	390
	11th to 20th	Night	15% 4 25% 40% 14% 1	388
	21st to end	Night	16% 4 26% 39% 13% 1	438
August	1st to 10th	Night	12% 4 20% 46% 17% 1	398
	11th to 20th	Night	17% 4 24% 36% 18% 1	513
	21st to end	Night	19% 6% 25% 32% 16% 1	879
September	1st to 10th	Night	16% 6% 30% 35% 13% 1	800
	11th to 20th	Night	17% 7% 27% 29% 19% 1	800
	21st to end	Night	21% 8% 28% 26% 16% 1	800
October	1st to 10th	Night	22% 11% 29% 28% 11%	800
	11th to 20th	Night	26% 11% 29% 26% 9% 1	800
	21st to end	Night	30% 11% 31% 23% 5%	880
November	1st to 10th	Night	26% 12% 31% 24% 6% 1	820
	11th to 20th	Night	26% 13% 31% 20% 9% 1	840
	21st to end	Night	31% 15% 26% 23% 4 1	840
December	1st to 10th	Night	29% 11% 30% 23% 6%	899
	11th to 20th	Night	27% 14% 34% 18% 5% 1	894
	21st to end	Night	33% 11% 32% 18% 5%	924

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

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