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 2024-12-06.

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	18% 10% 3 8% 5% 5% 5% 4 5% 6% 31%	101614
	Night	18% 11% 4 8% 5% 4 4 3 5% 6% 32%	98072
Transparency	Day	51% 7% 13% 19% 9% 1	105078
	Night	52% 6% 13% 19% 9% 1	102698
Seeing	Day	24% 16% 31% 20% 8% 2	14601
	Night	24% 11% 31% 26% 8% 1	23611

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	15% 15% 5% 11% 6% 5% 4 3 5% 6% 25%	2517
	11th to 20th	Day	12% 14% 8% 15% 7% 4 3 3 4 4 27%	2520
	21st to end	Day	12% 12% 6% 13% 6% 6% 4 4 6% 8% 25%	2772
February	1st to 10th	Day	13% 17% 5% 12% 7% 5% 4 3 4 5% 25%	1589
	11th to 20th	Day	12% 17% 5% 11% 6% 4 5% 3 4 6% 26%	1776
	21st to end	Day	16% 16% 5% 10% 7% 4 5% 2 4 5% 27%	1570
March	1st to 10th	Day	20% 14% 4 10% 6% 4 4 3 4 4 27%	3116
	11th to 20th	Day	13% 18% 5% 9% 6% 5% 4 3 5% 5% 28%	3249
	21st to end	Day	13% 13% 3 8% 6% 5% 4 3 4 5% 36%	4166
April	1st to 10th	Day	22% 14% 3 7% 5% 4 4 3 4 5% 29%	2280
	11th to 20th	Day	21% 8% 3 6% 5% 4 4 4 5% 5% 36%	2278
	21st to end	Day	21% 12% 3 7% 5% 5% 4 3 5% 6% 29%	2470
May	1st to 10th	Day	23% 8% 2 6% 5% 4 4 3 5% 6% 34%	4352
	11th to 20th	Day	17% 6% 3 7% 5% 5% 5% 4 6% 8% 35%	4398
	21st to end	Day	17% 7% 3 7% 5% 6% 6% 4 6% 7% 31%	4837
June	1st to 10th	Day	21% 7% 3 7% 7% 5% 6% 4 5% 7% 27%	2660
	11th to 20th	Day	18% 7% 3 6% 6% 5% 4 4 7% 7% 33%	2660
	21st to end	Day	23% 10% 3 8% 5% 5% 5% 4 5% 6% 26%	2660
July	1st to 10th	Day	14% 7% 3 9% 5% 6% 6% 4 7% 8% 31%	4440
	11th to 20th	Day	15% 6% 2 7% 6% 5% 7% 5% 8% 9% 31%	4440
	21st to end	Day	13% 6% 2 6% 5% 5% 5% 4 6% 7% 40%	4814
August	1st to 10th	Day	15% 5% 3 7% 6% 6% 6% 5% 9% 9% 29%	4423
	11th to 20th	Day	19% 7% 3 6% 5% 5% 6% 4 6% 8% 31%	4121
	21st to end	Day	18% 6% 3 7% 4 4 5% 4 6% 8% 36%	4180
September	1st to 10th	Day	16% 5% 2 6% 4 4 4 4 6% 7% 41%	2280
	11th to 20th	Day	16% 6% 2 5% 4 4 4 3 5% 7% 44%	2171
	21st to end	Day	20% 9% 3 5% 4 3 4 3 4 6% 39%	2090
October	1st to 10th	Day	22% 8% 3 6% 5% 4 4 3 5% 6% 34%	2001
	11th to 20th	Day	22% 9% 3 8% 6% 5% 5% 4 5% 6% 26%	1805
	21st to end	Day	26% 11% 2 7% 4 4 4 3 5% 6% 27%	1881
November	1st to 10th	Day	17% 13% 3 8% 5% 4 4 3 4 4 33%	1761
	11th to 20th	Day	20% 14% 4 8% 5% 4 4 3 5% 5% 28%	1720
	21st to end	Day	21% 17% 5% 7% 6% 4 4 4 4 5% 24%	1600
December	1st to 10th	Day	23% 16% 5% 9% 6% 4 4 3 3 5% 22%	1449
	11th to 20th	Day	23% 15% 5% 9% 5% 4 4 3 4 5% 25%	1796
	21st to end	Day	22% 17% 6% 10% 4 3 4 3 4 5% 23%	2772
January	1st to 10th	Night	15% 17% 6% 11% 5% 5% 4 3 5% 5% 25%	4429
	11th to 20th	Night	11% 16% 5% 11% 6% 5% 5% 3 4 6% 28%	4440
	21st to end	Night	11% 13% 5% 13% 7% 6% 6% 4 5% 5% 25%	4884
February	1st to 10th	Night	12% 14% 5% 10% 7% 6% 5% 4 5% 5% 28%	2589
	11th to 20th	Night	12% 14% 5% 12% 5% 6% 4 3 4 6% 29%	2289
	21st to end	Night	15% 12% 5% 9% 6% 5% 4 3 5% 5% 31%	1884
March	1st to 10th	Night	22% 13% 3 9% 5% 3 5% 3 4 5% 27%	3724
	11th to 20th	Night	16% 18% 5% 10% 5% 4 4 4 3 5% 27%	3694
	21st to end	Night	14% 9% 4 9% 6% 6% 5% 4 5% 5% 34%	3466
April	1st to 10th	Night	22% 11% 4 6% 4 4 4 3 4 5% 32%	1900
	11th to 20th	Night	20% 9% 3 6% 4 4 4 4 5% 6% 36%	1850
	21st to end	Night	22% 10% 3 7% 4 3 4 3 4 5% 35%	1710
May	1st to 10th	Night	22% 8% 3 6% 5% 5% 4 4 5% 6% 33%	2618
	11th to 20th	Night	22% 5% 2 5% 3 4 5% 3 6% 8% 37%	2495
	21st to end	Night	19% 5% 2 7% 6% 5% 6% 4 6% 9% 31%	2738
June	1st to 10th	Night	20% 7% 2 6% 4 4 5% 3 6% 8% 34%	1520
	11th to 20th	Night	19% 6% 3 6% 5% 4 4 5% 6% 7% 35%	1520
	21st to end	Night	20% 7% 3 7% 5% 5% 4 4 6% 7% 32%	1520
July	1st to 10th	Night	13% 6% 3 7% 6% 6% 6% 5% 7% 8% 34%	2520
	11th to 20th	Night	16% 5% 2 6% 5% 4 5% 4 6% 7% 40%	2520
	21st to end	Night	12% 4 1 5% 4 5% 5% 4 5% 7% 48%	2739
August	1st to 10th	Night	14% 6% 2 8% 5% 5% 5% 4 6% 8% 37%	2506
	11th to 20th	Night	17% 7% 3 7% 5% 4 4 4 5% 6% 38%	2659
	21st to end	Night	17% 6% 3 8% 5% 4 4 3 5% 6% 39%	3475
September	1st to 10th	Night	13% 6% 2 6% 3 4 4 4 6% 6% 46%	1900
	11th to 20th	Night	16% 5% 2 4 3 3 3 4 5% 7% 49%	2009
	21st to end	Night	18% 6% 1 5% 4 4 4 3 4 6% 45%	2090
October	1st to 10th	Night	18% 9% 2 6% 5% 3 4 3 4 5% 40%	2175
	11th to 20th	Night	22% 9% 2 7% 4 3 4 3 5% 6% 34%	2375
	21st to end	Night	25% 9% 3 7% 4 4 4 3 4 7% 31%	2717
November	1st to 10th	Night	19% 10% 3 8% 5% 4 4 3 5% 6% 32%	2537
	11th to 20th	Night	19% 10% 3 8% 6% 4 5% 4 5% 6% 31%	2675
	21st to end	Night	22% 15% 4 8% 4 3 4 3 4 5% 27%	2800
December	1st to 10th	Night	20% 15% 5% 10% 5% 5% 4 3 5% 6% 22%	2837
	11th to 20th	Night	22% 14% 5% 9% 6% 4 4 2 4 4 25%	3384
	21st to end	Night	23% 17% 6% 10% 4 3 3 2 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	59% 9% 10% 17% 5%	2518
	11th to 20th	Day	60% 5% 11% 18% 6%	2520
	21st to end	Day	58% 6% 10% 18% 6% 1	2772
February	1st to 10th	Day	63% 4 8% 15% 8% 2	1589
	11th to 20th	Day	58% 5% 12% 13% 11% 1	1785
	21st to end	Day	61% 4 9% 14% 9% 3	1570
March	1st to 10th	Day	59% 7% 8% 14% 10% 2	3119
	11th to 20th	Day	57% 7% 11% 13% 10% 2	3249
	21st to end	Day	50% 5% 8% 19% 15% 4	4166
April	1st to 10th	Day	57% 5% 10% 13% 12% 3	2280
	11th to 20th	Day	50% 5% 9% 21% 12% 3	2278
	21st to end	Day	55% 5% 9% 16% 13% 3	2470
May	1st to 10th	Day	50% 6% 12% 18% 14% 2	4366
	11th to 20th	Day	44% 10% 17% 19% 9% 1	4402
	21st to end	Day	48% 8% 11% 16% 16% 2	4837
June	1st to 10th	Day	54% 9% 10% 17% 9% 2	2660
	11th to 20th	Day	47% 7% 13% 20% 11% 2	2660
	21st to end	Day	58% 7% 9% 15% 10% 1	2660
July	1st to 10th	Day	48% 7% 14% 22% 8%	4370
	11th to 20th	Day	46% 8% 18% 22% 6%	4365
	21st to end	Day	41% 8% 16% 26% 8%	4661
August	1st to 10th	Day	46% 10% 17% 20% 6%	4409
	11th to 20th	Day	48% 8% 18% 20% 5%	4163
	21st to end	Day	45% 7% 15% 19% 14% 1	4180
September	1st to 10th	Day	40% 7% 18% 24% 11% 1	2280
	11th to 20th	Day	39% 7% 15% 28% 10% 1	2171
	21st to end	Day	47% 6% 13% 25% 10%	2090
October	1st to 10th	Day	49% 6% 13% 26% 7%	3326
	11th to 20th	Day	51% 6% 17% 23% 4	2982
	21st to end	Day	48% 6% 20% 18% 7% 1	3081
November	1st to 10th	Day	54% 6% 12% 19% 8% 1	1761
	11th to 20th	Day	58% 5% 11% 17% 9%	1720
	21st to end	Day	63% 6% 11% 15% 5%	1600
December	1st to 10th	Day	65% 5% 10% 15% 4	1449
	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	60% 8% 12% 13% 6%	4429
	11th to 20th	Night	58% 6% 11% 18% 5% 1	4440
	21st to end	Night	60% 7% 11% 13% 8% 1	4884
February	1st to 10th	Night	57% 6% 10% 17% 9% 1	2589
	11th to 20th	Night	58% 6% 10% 16% 10% 1	2291
	21st to end	Night	54% 6% 7% 17% 13% 2	1884
March	1st to 10th	Night	60% 6% 10% 13% 8% 3	3734
	11th to 20th	Night	60% 5% 9% 15% 10% 2	3695
	21st to end	Night	50% 5% 9% 20% 11% 3	3466
April	1st to 10th	Night	54% 6% 9% 15% 15% 2	1900
	11th to 20th	Night	47% 6% 9% 22% 14% 2	1850
	21st to end	Night	51% 5% 8% 19% 15% 3	1710
May	1st to 10th	Night	52% 7% 12% 18% 9% 2	2624
	11th to 20th	Night	43% 10% 14% 19% 12% 2	2496
	21st to end	Night	48% 6% 14% 16% 15% 1	2739
June	1st to 10th	Night	47% 8% 13% 20% 11% 1	1520
	11th to 20th	Night	45% 8% 12% 19% 12% 4	1520
	21st to end	Night	49% 9% 12% 16% 13%	1520
July	1st to 10th	Night	45% 7% 20% 19% 8%	2480
	11th to 20th	Night	42% 7% 20% 25% 6%	2472
	21st to end	Night	35% 6% 21% 27% 11%	2651
August	1st to 10th	Night	44% 7% 17% 23% 8%	2496
	11th to 20th	Night	45% 6% 20% 22% 7%	2683
	21st to end	Night	45% 6% 13% 23% 12%	3475
September	1st to 10th	Night	37% 8% 16% 25% 12% 1	1900
	11th to 20th	Night	35% 8% 16% 31% 9% 1	2009
	21st to end	Night	41% 7% 10% 30% 12%	2090
October	1st to 10th	Night	49% 5% 13% 25% 8%	3630
	11th to 20th	Night	44% 6% 15% 28% 6%	3937
	21st to end	Night	46% 5% 18% 18% 11% 1	4467
November	1st to 10th	Night	51% 7% 14% 20% 7% 1	2537
	11th to 20th	Night	54% 6% 12% 18% 9% 1	2675
	21st to end	Night	60% 6% 12% 15% 7%	2800
December	1st to 10th	Night	63% 6% 12% 14% 5%	2837
	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	27% 16% 38% 13% 6%	180
	21st to end	Day	19% 15% 38% 21% 7%	198
February	1st to 10th	Day	26% 28% 36% 8% 1	213
	11th to 20th	Day	24% 26% 36% 13% 1	384
	21st to end	Day	26% 21% 35% 15% 3	382
March	1st to 10th	Day	24% 18% 34% 19% 5%	460
	11th to 20th	Day	25% 21% 35% 14% 5% 1	460
	21st to end	Day	26% 24% 26% 17% 6% 2	506
April	1st to 10th	Day	32% 15% 29% 18% 6%	460
	11th to 20th	Day	27% 21% 27% 17% 6% 3	452
	21st to end	Day	31% 17% 36% 12% 4 2	460
May	1st to 10th	Day	29% 17% 31% 17% 5% 1	463
	11th to 20th	Day	20% 19% 30% 23% 7% 1	487
	21st to end	Day	24% 19% 33% 17% 6% 1	529
June	1st to 10th	Day	22% 15% 37% 19% 6% 1	490
	11th to 20th	Day	21% 16% 32% 20% 10% 1	490
	21st to end	Day	27% 14% 29% 21% 8% 1	490
July	1st to 10th	Day	18% 9% 37% 24% 10% 2	485
	11th to 20th	Day	17% 10% 35% 29% 7% 1	484
	21st to end	Day	15% 9% 32% 30% 12% 2	532
August	1st to 10th	Day	15% 11% 29% 28% 14% 2	486
	11th to 20th	Day	17% 6% 28% 30% 14% 5%	479
	21st to end	Day	17% 13% 28% 22% 13% 6%	539
September	1st to 10th	Day	19% 13% 31% 21% 11% 5%	490
	11th to 20th	Day	18% 10% 27% 26% 14% 6%	490
	21st to end	Day	24% 13% 28% 19% 11% 5%	490
October	1st to 10th	Day	24% 15% 29% 19% 11% 2	490
	11th to 20th	Day	27% 18% 29% 17% 8% 1	440
	21st to end	Day	34% 14% 29% 18% 5%	429
November	1st to 10th	Day	29% 15% 31% 19% 6% 1	395
	11th to 20th	Day	31% 15% 30% 18% 6%	320
	21st to end	Day	29% 21% 31% 17% 2 1	200
December	1st to 10th	Day	34% 12% 32% 15% 6% 1	190
	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	27% 14% 34% 19% 6%	760
	21st to end	Night	16% 11% 36% 31% 5%	836
February	1st to 10th	Night	20% 12% 37% 26% 5% 1	760
	11th to 20th	Night	20% 16% 39% 21% 4	743
	21st to end	Night	23% 14% 34% 25% 5%	628
March	1st to 10th	Night	23% 13% 34% 26% 3	760
	11th to 20th	Night	24% 16% 33% 20% 5% 1	760
	21st to end	Night	22% 15% 34% 22% 7% 1	836
April	1st to 10th	Night	30% 13% 28% 23% 6%	760
	11th to 20th	Night	26% 14% 31% 23% 6%	726
	21st to end	Night	29% 14% 33% 19% 5%	570
May	1st to 10th	Night	28% 13% 29% 24% 5% 1	445
	11th to 20th	Night	23% 10% 31% 28% 9%	374
	21st to end	Night	22% 9% 37% 24% 9%	411
June	1st to 10th	Night	24% 6% 28% 35% 6%	380
	11th to 20th	Night	21% 7% 26% 36% 10% 1	380
	21st to end	Night	23% 6% 26% 33% 11%	380
July	1st to 10th	Night	14% 6% 31% 37% 12%	370
	11th to 20th	Night	15% 4 25% 40% 15% 1	368
	21st to end	Night	17% 4 26% 39% 14% 1	416
August	1st to 10th	Night	12% 4 21% 46% 16% 1	378
	11th to 20th	Night	18% 4 24% 36% 18% 1	487
	21st to end	Night	18% 6% 26% 31% 16% 1	835
September	1st to 10th	Night	17% 6% 31% 34% 12% 1	760
	11th to 20th	Night	18% 7% 27% 28% 19% 1	760
	21st to end	Night	22% 8% 29% 24% 16% 1	760
October	1st to 10th	Night	23% 11% 29% 27% 11%	760
	11th to 20th	Night	27% 10% 29% 25% 9% 1	760
	21st to end	Night	30% 11% 31% 23% 5%	836
November	1st to 10th	Night	25% 12% 31% 24% 7% 1	780
	11th to 20th	Night	25% 13% 31% 20% 9% 1	800
	21st to end	Night	31% 15% 26% 23% 5% 1	800
December	1st to 10th	Night	30% 10% 29% 24% 7%	831
	11th to 20th	Night	27% 14% 34% 19% 6% 1	805
	21st to end	Night	33% 12% 32% 18% 4	836

Page generated at 2024-12-03 06:45:11. Version ac07

Copyright © 2024 Attilla Danko.