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 2024-01-16.

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	19% 10% 4 7% 6% 3 5% 5% 5% 6% 31%	74569
	Night	18% 10% 4 7% 6% 3 4 4 5% 6% 33%	75207
Transparency	Day	53% 7% 11% 18% 10% 1	74275
	Night	52% 7% 11% 19% 10% 1	75036
Seeing	Day	24% 16% 31% 20% 8% 2	13424
	Night	24% 11% 31% 26% 8% 1	22538

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	17% 14% 6% 11% 8% 4 4 4 4 4 23%	1517
	11th to 20th	Day	16% 15% 7% 8% 8% 3 4 4 4 5% 25%	1480
	21st to end	Day	11% 13% 6% 9% 8% 4 5% 4 5% 7% 29%	1584
February	1st to 10th	Day	13% 16% 6% 11% 9% 4 5% 4 3 5% 25%	1506
	11th to 20th	Day	13% 16% 6% 10% 6% 3 5% 4 4 6% 26%	1680
	21st to end	Day	16% 15% 6% 9% 8% 3 5% 3 3 5% 27%	1480
March	1st to 10th	Day	14% 12% 5% 9% 8% 3 5% 4 4 5% 30%	1797
	11th to 20th	Day	17% 13% 4 7% 6% 3 5% 5% 4 5% 31%	1847
	21st to end	Day	16% 12% 4 6% 7% 4 5% 5% 4 5% 32%	2376
April	1st to 10th	Day	23% 12% 4 6% 6% 3 4 4 4 5% 29%	2160
	11th to 20th	Day	21% 7% 3 5% 5% 3 4 4 5% 5% 37%	2156
	21st to end	Day	22% 11% 4 5% 6% 4 4 4 4 6% 30%	2340
May	1st to 10th	Day	23% 8% 3 6% 6% 3 4 4 5% 6% 35%	2474
	11th to 20th	Day	19% 7% 3 7% 6% 4 5% 5% 5% 6% 35%	2478
	21st to end	Day	20% 8% 3 6% 6% 3 5% 5% 5% 7% 31%	2725
June	1st to 10th	Day	22% 6% 4 5% 7% 4 6% 6% 6% 7% 27%	2520
	11th to 20th	Day	19% 7% 3 5% 6% 4 5% 5% 6% 7% 33%	2520
	21st to end	Day	23% 8% 4 7% 6% 4 5% 5% 6% 6% 26%	2520
July	1st to 10th	Day	15% 6% 3 6% 6% 4 6% 5% 7% 9% 33%	2520
	11th to 20th	Day	15% 6% 3 6% 7% 3 7% 6% 7% 9% 32%	2520
	21st to end	Day	14% 6% 3 7% 7% 4 6% 7% 7% 7% 32%	2744
August	1st to 10th	Day	17% 6% 3 7% 7% 4 6% 6% 8% 9% 27%	2506
	11th to 20th	Day	15% 6% 3 5% 6% 4 6% 6% 6% 8% 35%	2355
	21st to end	Day	14% 6% 3 6% 5% 3 6% 6% 6% 8% 37%	2376
September	1st to 10th	Day	16% 5% 2 5% 5% 3 5% 5% 6% 7% 41%	2160
	11th to 20th	Day	16% 6% 2 5% 4 4 4 4 5% 7% 43%	2057
	21st to end	Day	20% 8% 3 4 4 2 4 4 4 7% 40%	1980
October	1st to 10th	Day	23% 7% 3 5% 6% 3 4 4 5% 6% 34%	1896
	11th to 20th	Day	23% 9% 3 7% 7% 3 5% 5% 5% 7% 25%	1710
	21st to end	Day	28% 11% 3 6% 5% 3 4 4 5% 6% 26%	1782
November	1st to 10th	Day	17% 12% 4 7% 6% 3 4 4 5% 4 33%	1671
	11th to 20th	Day	22% 13% 5% 8% 5% 3 5% 4 4 5% 28%	1634
	21st to end	Day	21% 15% 5% 6% 6% 3 4 5% 4 5% 25%	1520
December	1st to 10th	Day	24% 14% 5% 8% 6% 3 4 4 3 5% 23%	1410
	11th to 20th	Day	23% 13% 5% 8% 5% 3 4 3 4 5% 25%	1796
	21st to end	Day	22% 17% 6% 8% 6% 3 4 3 4 5% 23%	2772
January	1st to 10th	Night	18% 17% 7% 9% 6% 4 4 4 5% 5% 21%	2649
	11th to 20th	Night	16% 18% 5% 9% 5% 3 4 4 4 5% 27%	2602
	21st to end	Night	11% 11% 5% 10% 8% 4 5% 5% 5% 5% 31%	2772
February	1st to 10th	Night	12% 13% 6% 9% 8% 4 5% 5% 4 6% 28%	2452
	11th to 20th	Night	12% 13% 5% 11% 7% 4 5% 4 4 6% 29%	2165
	21st to end	Night	15% 11% 5% 9% 7% 4 5% 4 5% 5% 31%	1776
March	1st to 10th	Night	15% 13% 4 10% 8% 3 5% 5% 4 6% 28%	2150
	11th to 20th	Night	17% 13% 4 7% 5% 3 5% 5% 3 5% 31%	2110
	21st to end	Night	15% 10% 3 8% 5% 3 5% 4 4 5% 36%	1980
April	1st to 10th	Night	23% 10% 5% 6% 4 3 4 4 4 5% 30%	1800
	11th to 20th	Night	19% 8% 4 6% 4 3 4 4 5% 6% 37%	1752
	21st to end	Night	22% 10% 3 7% 5% 2 4 4 4 5% 35%	1620
May	1st to 10th	Night	22% 8% 3 5% 5% 3 4 4 4 5% 36%	1502
	11th to 20th	Night	21% 5% 3 5% 4 3 4 4 5% 9% 37%	1415
	21st to end	Night	19% 6% 3 6% 5% 3 5% 4 4 8% 37%	1550
June	1st to 10th	Night	20% 7% 3 5% 5% 3 4 4 6% 8% 34%	1440
	11th to 20th	Night	20% 6% 3 5% 6% 3 4 5% 5% 8% 35%	1440
	21st to end	Night	20% 6% 3 7% 5% 4 4 5% 6% 7% 33%	1440
July	1st to 10th	Night	14% 6% 3 6% 5% 4 4 5% 6% 8% 39%	1440
	11th to 20th	Night	14% 5% 3 6% 6% 3 5% 5% 6% 8% 40%	1440
	21st to end	Night	14% 5% 3 5% 5% 3 6% 5% 6% 8% 40%	1574
August	1st to 10th	Night	12% 5% 2 4 6% 3 5% 5% 7% 9% 41%	1432
	11th to 20th	Night	15% 5% 2 5% 7% 4 5% 5% 5% 6% 40%	1525
	21st to end	Night	16% 5% 3 5% 4 3 4 4 5% 7% 45%	1979
September	1st to 10th	Night	13% 6% 2 5% 5% 4 4 5% 6% 6% 45%	1800
	11th to 20th	Night	17% 5% 2 4 3 3 3 4 5% 7% 48%	1903
	21st to end	Night	19% 6% 2 4 4 2 4 4 4 6% 46%	1980
October	1st to 10th	Night	19% 8% 3 5% 5% 2 3 5% 4 5% 41%	2060
	11th to 20th	Night	24% 8% 3 6% 5% 3 4 4 5% 6% 33%	2250
	21st to end	Night	26% 9% 3 6% 5% 3 4 4 4 7% 30%	2574
November	1st to 10th	Night	19% 9% 4 7% 6% 3 4 4 5% 6% 33%	2407
	11th to 20th	Night	20% 10% 4 7% 6% 3 5% 4 5% 6% 30%	2541
	21st to end	Night	22% 14% 5% 7% 5% 2 5% 4 4 5% 28%	2660
December	1st to 10th	Night	21% 14% 5% 8% 6% 3 4 4 5% 6% 22%	2759
	11th to 20th	Night	22% 13% 5% 8% 7% 3 5% 3 4 4 25%	3384
	21st to end	Night	23% 16% 7% 8% 5% 3 3 3 3 4 24%	4884

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	65% 6% 8% 14% 7%	1518
	11th to 20th	Day	62% 5% 9% 15% 8% 1	1480
	21st to end	Day	56% 5% 9% 17% 11% 2	1584
February	1st to 10th	Day	63% 4 8% 14% 8% 2	1506
	11th to 20th	Day	59% 5% 12% 12% 11% 1	1689
	21st to end	Day	61% 4 8% 15% 9% 3	1480
March	1st to 10th	Day	57% 5% 8% 16% 12% 2	1800
	11th to 20th	Day	55% 6% 11% 13% 13% 3	1847
	21st to end	Day	55% 5% 8% 16% 12% 3	2376
April	1st to 10th	Day	58% 5% 10% 13% 11% 3	2160
	11th to 20th	Day	49% 5% 10% 21% 12% 3	2156
	21st to end	Day	56% 5% 9% 15% 13% 3	2340
May	1st to 10th	Day	51% 5% 9% 18% 14% 3	2474
	11th to 20th	Day	49% 6% 10% 18% 15% 2	2482
	21st to end	Day	52% 7% 10% 17% 14% 2	2725
June	1st to 10th	Day	54% 9% 9% 17% 9% 2	2520
	11th to 20th	Day	48% 7% 12% 20% 11% 2	2520
	21st to end	Day	58% 8% 9% 15% 10% 1	2520
July	1st to 10th	Day	45% 9% 14% 22% 9%	2450
	11th to 20th	Day	45% 10% 13% 22% 9%	2445
	21st to end	Day	49% 11% 15% 19% 7%	2591
August	1st to 10th	Day	49% 12% 16% 18% 5%	2492
	11th to 20th	Day	44% 11% 15% 21% 9%	2355
	21st to end	Day	42% 9% 15% 23% 11% 1	2376
September	1st to 10th	Day	41% 7% 17% 23% 11% 1	2160
	11th to 20th	Day	40% 7% 15% 27% 10% 1	2057
	21st to end	Day	46% 6% 13% 25% 10%	1980
October	1st to 10th	Day	52% 5% 11% 22% 9% 1	1896
	11th to 20th	Day	58% 7% 13% 18% 3	1710
	21st to end	Day	59% 6% 11% 15% 8% 1	1782
November	1st to 10th	Day	54% 6% 12% 18% 9% 1	1671
	11th to 20th	Day	59% 5% 11% 16% 9%	1634
	21st to end	Day	61% 6% 11% 15% 6%	1520
December	1st to 10th	Day	64% 5% 10% 16% 5%	1410
	11th to 20th	Day	61% 4 9% 18% 8%	1797
	21st to end	Day	65% 5% 8% 13% 8% 1	2772
January	1st to 10th	Night	65% 6% 9% 14% 6%	2649
	11th to 20th	Night	62% 5% 9% 13% 9% 1	2602
	21st to end	Night	54% 5% 10% 17% 14% 1	2772
February	1st to 10th	Night	57% 6% 9% 17% 9% 1	2452
	11th to 20th	Night	58% 6% 9% 16% 10% 1	2167
	21st to end	Night	55% 6% 7% 17% 14% 2	1776
March	1st to 10th	Night	58% 5% 9% 16% 11% 2	2160
	11th to 20th	Night	55% 5% 9% 15% 12% 3	2111
	21st to end	Night	50% 5% 9% 20% 13% 3	1980
April	1st to 10th	Night	55% 6% 9% 14% 14% 2	1800
	11th to 20th	Night	46% 6% 10% 22% 14% 2	1752
	21st to end	Night	52% 5% 7% 19% 14% 3	1620
May	1st to 10th	Night	51% 5% 9% 16% 15% 4	1502
	11th to 20th	Night	46% 7% 11% 18% 15% 4	1416
	21st to end	Night	46% 7% 11% 19% 15% 2	1551
June	1st to 10th	Night	47% 8% 12% 20% 11% 1	1440
	11th to 20th	Night	46% 8% 11% 19% 12% 4	1440
	21st to end	Night	48% 10% 12% 17% 13%	1440
July	1st to 10th	Night	41% 10% 16% 21% 11% 1	1400
	11th to 20th	Night	41% 9% 14% 26% 9% 1	1392
	21st to end	Night	41% 9% 16% 24% 9%	1486
August	1st to 10th	Night	38% 10% 17% 28% 7%	1422
	11th to 20th	Night	42% 8% 16% 24% 9%	1525
	21st to end	Night	40% 8% 14% 28% 10%	1979
September	1st to 10th	Night	37% 8% 16% 25% 12% 1	1800
	11th to 20th	Night	36% 8% 16% 30% 9% 1	1903
	21st to end	Night	41% 7% 11% 30% 12%	1980
October	1st to 10th	Night	46% 6% 9% 25% 13%	2060
	11th to 20th	Night	52% 7% 13% 22% 6%	2250
	21st to end	Night	55% 7% 12% 18% 8%	2574
November	1st to 10th	Night	51% 7% 13% 20% 8% 1	2407
	11th to 20th	Night	55% 6% 12% 17% 9% 1	2541
	21st to end	Night	59% 6% 12% 16% 7%	2660
December	1st to 10th	Night	63% 6% 12% 14% 5%	2759
	11th to 20th	Night	62% 6% 8% 16% 8%	3384
	21st to end	Night	64% 5% 8% 16% 6% 1	4884

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	23% 21% 36% 16% 4 1	180
	11th to 20th	Day	26% 15% 39% 14% 6%	170
	21st to end	Day	19% 15% 38% 21% 7%	176
February	1st to 10th	Day	28% 28% 36% 6% 1 1	190
	11th to 20th	Day	25% 26% 35% 12% 1	348
	21st to end	Day	26% 19% 36% 15% 4	346
March	1st to 10th	Day	23% 18% 35% 19% 5%	420
	11th to 20th	Day	26% 20% 34% 15% 5% 1	420
	21st to end	Day	27% 22% 26% 18% 6% 2	462
April	1st to 10th	Day	32% 15% 29% 18% 6%	420
	11th to 20th	Day	26% 20% 27% 17% 6% 3	412
	21st to end	Day	31% 16% 35% 12% 4 2	420
May	1st to 10th	Day	29% 18% 30% 17% 5% 1	423
	11th to 20th	Day	21% 20% 30% 20% 7% 2	447
	21st to end	Day	24% 19% 34% 17% 6% 1	485
June	1st to 10th	Day	23% 15% 38% 18% 6% 1	450
	11th to 20th	Day	22% 16% 31% 20% 10% 1	450
	21st to end	Day	26% 13% 30% 22% 8% 1	450
July	1st to 10th	Day	17% 10% 35% 26% 10% 2	445
	11th to 20th	Day	16% 9% 34% 30% 8% 2	444
	21st to end	Day	15% 9% 30% 31% 13% 2	488
August	1st to 10th	Day	16% 10% 28% 30% 14% 2	446
	11th to 20th	Day	16% 6% 28% 31% 14% 5%	439
	21st to end	Day	17% 14% 29% 22% 13% 6%	495
September	1st to 10th	Day	19% 12% 31% 21% 12% 5%	450
	11th to 20th	Day	19% 11% 28% 24% 13% 6%	450
	21st to end	Day	24% 14% 28% 18% 11% 6%	450
October	1st to 10th	Day	25% 14% 30% 19% 10% 2	450
	11th to 20th	Day	27% 17% 29% 18% 8% 1	405
	21st to end	Day	35% 14% 28% 18% 5%	396
November	1st to 10th	Day	27% 15% 32% 19% 6% 1	365
	11th to 20th	Day	31% 16% 28% 18% 6%	294
	21st to end	Day	27% 22% 31% 17% 2 1	180
December	1st to 10th	Day	35% 12% 32% 14% 6% 1	180
	11th to 20th	Day	33% 21% 28% 16% 3	180
	21st to end	Day	32% 22% 28% 13% 4 1	198
January	1st to 10th	Night	27% 12% 36% 21% 4	760
	11th to 20th	Night	28% 14% 34% 19% 6%	744
	21st to end	Night	17% 11% 36% 31% 5% 1	792
February	1st to 10th	Night	20% 12% 37% 26% 5% 1	720
	11th to 20th	Night	21% 15% 38% 21% 5%	703
	21st to end	Night	23% 13% 34% 25% 5%	592
March	1st to 10th	Night	23% 13% 35% 26% 3	720
	11th to 20th	Night	25% 15% 34% 20% 5% 1	720
	21st to end	Night	22% 15% 33% 22% 7% 1	792
April	1st to 10th	Night	30% 12% 28% 23% 7%	720
	11th to 20th	Night	25% 13% 32% 24% 6%	688
	21st to end	Night	28% 14% 33% 20% 5%	540
May	1st to 10th	Night	28% 13% 28% 25% 5% 1	422
	11th to 20th	Night	23% 10% 31% 27% 8%	354
	21st to end	Night	22% 9% 36% 24% 9%	389
June	1st to 10th	Night	25% 6% 28% 35% 6%	360
	11th to 20th	Night	21% 7% 25% 37% 10% 1	360
	21st to end	Night	22% 5% 26% 34% 12%	360
July	1st to 10th	Night	14% 6% 31% 36% 13%	350
	11th to 20th	Night	15% 4 25% 41% 15% 1	348
	21st to end	Night	17% 4 26% 39% 14% 1	394
August	1st to 10th	Night	13% 3 20% 47% 16% 1	358
	11th to 20th	Night	17% 4 24% 36% 17% 1	461
	21st to end	Night	18% 6% 27% 31% 17% 1	791
September	1st to 10th	Night	16% 6% 31% 34% 13% 1	720
	11th to 20th	Night	18% 7% 28% 27% 18% 1	720
	21st to end	Night	22% 8% 29% 24% 15% 1	720
October	1st to 10th	Night	23% 11% 28% 28% 11%	720
	11th to 20th	Night	27% 10% 29% 24% 9% 1	720
	21st to end	Night	31% 10% 31% 23% 5%	792
November	1st to 10th	Night	25% 12% 31% 24% 7% 1	740
	11th to 20th	Night	25% 12% 32% 20% 9% 1	760
	21st to end	Night	30% 15% 26% 23% 5% 1	760
December	1st to 10th	Night	30% 10% 30% 23% 7%	807
	11th to 20th	Night	27% 14% 34% 19% 6% 1	805
	21st to end	Night	33% 12% 32% 18% 4	836

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