Kamouraska
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Kamouraska clear sky chart from 2005-11-06 to 2024-09-29.

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	15% 10% 3 8% 5% 5% 5% 4 6% 7% 33%	101265
	Night	17% 12% 4 9% 6% 5% 5% 4 5% 6% 29%	97007
Transparency	Day	51% 3 14% 22% 9% 1	101014
	Night	57% 3 12% 19% 9% 1	96880
Seeing	Day	24% 8% 29% 25% 11% 3	15513
	Night	25% 7% 27% 30% 10% 1	23641

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	13% 17% 5% 11% 5% 5% 6% 4 6% 7% 21%	2334
	11th to 20th	Day	12% 12% 6% 10% 7% 5% 6% 4 5% 6% 27%	2520
	21st to end	Day	8% 9% 5% 11% 7% 6% 6% 4 6% 7% 32%	2772
February	1st to 10th	Day	8% 14% 4 10% 9% 7% 5% 5% 6% 6% 26%	1567
	11th to 20th	Day	11% 15% 6% 13% 7% 5% 4 3 6% 5% 25%	1752
	21st to end	Day	11% 11% 4 8% 6% 6% 6% 5% 6% 7% 30%	1570
March	1st to 10th	Day	15% 13% 4 9% 6% 5% 5% 4 5% 6% 29%	3116
	11th to 20th	Day	16% 19% 5% 9% 6% 5% 4 4 4 6% 23%	3407
	21st to end	Day	14% 17% 4 8% 4 4 3 3 4 5% 35%	3932
April	1st to 10th	Day	20% 12% 3 8% 5% 4 4 4 4 6% 29%	2280
	11th to 20th	Day	18% 9% 3 7% 4 4 5% 3 5% 6% 38%	2413
	21st to end	Day	23% 9% 3 5% 4 4 4 3 5% 7% 34%	2470
May	1st to 10th	Day	15% 9% 3 8% 5% 5% 5% 4 6% 7% 34%	4124
	11th to 20th	Day	17% 8% 2 7% 5% 4 4 4 6% 8% 35%	4416
	21st to end	Day	16% 7% 3 7% 5% 5% 5% 5% 7% 8% 32%	5185
June	1st to 10th	Day	19% 8% 3 6% 6% 5% 5% 4 6% 7% 32%	2850
	11th to 20th	Day	17% 6% 2 6% 5% 4 5% 4 7% 8% 37%	2850
	21st to end	Day	19% 8% 3 7% 6% 4 5% 5% 5% 8% 30%	2850
July	1st to 10th	Day	13% 6% 3 7% 5% 5% 5% 5% 7% 9% 35%	4760
	11th to 20th	Day	11% 6% 2 7% 5% 6% 5% 5% 6% 8% 37%	4519
	21st to end	Day	10% 7% 3 6% 5% 4 5% 4 6% 8% 43%	4814
August	1st to 10th	Day	13% 6% 2 6% 5% 5% 5% 6% 8% 10% 33%	4329
	11th to 20th	Day	15% 7% 2 7% 6% 5% 5% 4 6% 8% 35%	4045
	21st to end	Day	17% 6% 2 6% 3 4 4 3 6% 7% 42%	4505
September	1st to 10th	Day	14% 5% 3 6% 4 4 4 4 6% 9% 43%	2252
	11th to 20th	Day	15% 6% 2 5% 3 3 3 3 4 6% 50%	2090
	21st to end	Day	17% 6% 2 6% 4 4 4 4 5% 8% 41%	2070
October	1st to 10th	Day	15% 6% 3 7% 5% 4 5% 3 6% 8% 37%	1947
	11th to 20th	Day	21% 9% 3 8% 5% 4 5% 3 6% 7% 30%	1679
	21st to end	Day	25% 13% 4 7% 5% 3 4 4 5% 6% 25%	1782
November	1st to 10th	Day	17% 10% 4 8% 5% 5% 5% 4 5% 6% 32%	1671
	11th to 20th	Day	17% 12% 5% 10% 6% 4 5% 4 7% 7% 24%	1590
	21st to end	Day	18% 17% 3 9% 6% 5% 6% 3 5% 4 25%	1375
December	1st to 10th	Day	18% 16% 5% 12% 9% 5% 4 3 4 5% 20%	1330
	11th to 20th	Day	19% 15% 4 10% 6% 5% 4 4 5% 3 26%	1668
	21st to end	Day	22% 13% 4 10% 4 4 4 3 3 4 30%	2431
January	1st to 10th	Night	13% 17% 5% 11% 8% 6% 6% 4 5% 5% 20%	4616
	11th to 20th	Night	11% 15% 5% 11% 8% 6% 5% 4 6% 6% 23%	4440
	21st to end	Night	8% 12% 5% 12% 6% 6% 5% 4 7% 7% 27%	4884
February	1st to 10th	Night	10% 14% 5% 9% 8% 6% 5% 4 5% 6% 29%	2613
	11th to 20th	Night	12% 17% 6% 11% 8% 5% 5% 3 5% 5% 24%	2312
	21st to end	Night	14% 13% 5% 10% 5% 4 4 3 5% 6% 30%	1884
March	1st to 10th	Night	18% 13% 4 10% 5% 5% 7% 3 5% 5% 26%	3724
	11th to 20th	Night	15% 23% 5% 11% 6% 5% 4 3 4 4 20%	3551
	21st to end	Night	19% 17% 4 7% 4 4 4 3 4 5% 29%	3696
April	1st to 10th	Night	22% 15% 3 8% 4 4 4 3 5% 4 28%	1900
	11th to 20th	Night	20% 10% 2 7% 6% 4 5% 3 5% 6% 32%	1716
	21st to end	Night	27% 8% 3 6% 4 4 5% 3 3 5% 33%	1710
May	1st to 10th	Night	19% 9% 3 6% 5% 5% 4 4 5% 7% 31%	2834
	11th to 20th	Night	19% 10% 4 8% 5% 5% 5% 4 6% 7% 29%	2489
	21st to end	Night	18% 7% 2 7% 5% 5% 5% 6% 6% 8% 32%	2401
June	1st to 10th	Night	20% 9% 3 8% 5% 5% 4 5% 5% 8% 28%	1330
	11th to 20th	Night	16% 7% 2 6% 4 4 5% 3 7% 8% 38%	1330
	21st to end	Night	22% 8% 3 9% 5% 4 5% 4 5% 7% 29%	1330
July	1st to 10th	Night	14% 8% 2 7% 6% 4 5% 4 6% 9% 34%	2210
	11th to 20th	Night	14% 7% 2 6% 6% 6% 5% 5% 6% 8% 36%	2426
	21st to end	Night	11% 6% 2 6% 5% 5% 5% 4 6% 9% 40%	2739
August	1st to 10th	Night	18% 6% 4 6% 5% 5% 5% 4 6% 7% 34%	2569
	11th to 20th	Night	15% 7% 3 10% 6% 6% 6% 5% 7% 9% 26%	2782
	21st to end	Night	16% 9% 3 7% 4 4 4 3 4 6% 40%	3148
September	1st to 10th	Night	15% 6% 2 6% 5% 5% 4 4 5% 8% 39%	1927
	11th to 20th	Night	18% 7% 3 5% 4 4 4 4 5% 5% 40%	2090
	21st to end	Night	17% 8% 3 6% 4 4 4 2 5% 5% 43%	2078
October	1st to 10th	Night	18% 10% 2 7% 4 3 3 3 4 5% 41%	2012
	11th to 20th	Night	24% 10% 3 6% 4 4 5% 3 5% 6% 29%	2278
	21st to end	Night	23% 11% 3 7% 4 4 4 3 5% 6% 29%	2574
November	1st to 10th	Night	19% 12% 3 7% 5% 4 4 4 4 6% 30%	2407
	11th to 20th	Night	19% 12% 4 8% 6% 5% 4 3 5% 7% 27%	2588
	21st to end	Night	18% 14% 6% 10% 5% 5% 4 3 5% 5% 24%	2802
December	1st to 10th	Night	19% 19% 5% 10% 6% 5% 4 3 4 5% 20%	2850
	11th to 20th	Night	19% 14% 4 10% 7% 6% 5% 3 5% 6% 21%	3531
	21st to end	Night	20% 16% 4 10% 5% 4 5% 3 5% 5% 24%	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	63% 2 14% 17% 4	2335
	11th to 20th	Day	60% 2 8% 23% 7% 1	2520
	21st to end	Day	52% 2 14% 20% 12%	2772
February	1st to 10th	Day	58% 2 11% 16% 10% 2	1567
	11th to 20th	Day	61% 2 10% 17% 9% 1	1760
	21st to end	Day	54% 3 7% 22% 12% 2	1570
March	1st to 10th	Day	58% 2 13% 15% 9% 3	3119
	11th to 20th	Day	65% 1 10% 15% 7% 1	3407
	21st to end	Day	55% 1 7% 20% 13% 4	3932
April	1st to 10th	Day	58% 2 9% 17% 11% 3	2280
	11th to 20th	Day	49% 2 10% 24% 13% 2	2413
	21st to end	Day	52% 2 9% 20% 15% 2	2470
May	1st to 10th	Day	51% 1 12% 21% 13% 1	4138
	11th to 20th	Day	50% 1 15% 25% 9%	4420
	21st to end	Day	51% 3 10% 24% 12% 1	5185
June	1st to 10th	Day	51% 3 11% 22% 12% 1	2850
	11th to 20th	Day	45% 3 15% 24% 11% 1	2850
	21st to end	Day	53% 4 14% 20% 9% 1	2850
July	1st to 10th	Day	45% 5% 17% 26% 7%	4685
	11th to 20th	Day	44% 5% 23% 23% 5% 1	4441
	21st to end	Day	39% 5% 21% 25% 9%	4661
August	1st to 10th	Day	43% 6% 22% 23% 7%	4315
	11th to 20th	Day	47% 5% 21% 23% 5%	4084
	21st to end	Day	42% 4 19% 22% 13%	4505
September	1st to 10th	Day	40% 3 17% 28% 12% 1	2252
	11th to 20th	Day	38% 3 17% 29% 13% 1	2090
	21st to end	Day	44% 3 15% 28% 11%	2070
October	1st to 10th	Day	46% 3 13% 26% 11%	1947
	11th to 20th	Day	55% 3 16% 21% 5%	1679
	21st to end	Day	62% 3 11% 18% 6%	1782
November	1st to 10th	Day	55% 2 13% 22% 7% 1	1671
	11th to 20th	Day	60% 4 8% 21% 7%	1590
	21st to end	Day	63% 3 13% 16% 5%	1375
December	1st to 10th	Day	69% 2 10% 14% 6%	1330
	11th to 20th	Day	63% 3 7% 19% 8%	1668
	21st to end	Day	61% 2 12% 16% 6% 3	2431
January	1st to 10th	Night	68% 2 12% 12% 6%	4616
	11th to 20th	Night	63% 2 9% 16% 9%	4440
	21st to end	Night	56% 2 11% 19% 11%	4884
February	1st to 10th	Night	56% 4 10% 19% 10% 1	2613
	11th to 20th	Night	63% 3 9% 16% 9% 1	2315
	21st to end	Night	57% 2 8% 22% 11% 1	1884
March	1st to 10th	Night	62% 2 11% 17% 8% 1	3734
	11th to 20th	Night	70% 1 9% 14% 6% 1	3552
	21st to end	Night	60% 1 6% 22% 10% 1	3696
April	1st to 10th	Night	61% 1 5% 16% 13% 3	1900
	11th to 20th	Night	55% 2 8% 20% 14% 1	1716
	21st to end	Night	57% 2 6% 21% 13% 2	1710
May	1st to 10th	Night	54% 2 11% 18% 13% 2	2840
	11th to 20th	Night	56% 1 12% 21% 10% 1	2490
	21st to end	Night	51% 2 12% 22% 11% 1	2402
June	1st to 10th	Night	55% 3 12% 21% 9% 1	1330
	11th to 20th	Night	45% 3 14% 21% 15% 2	1330
	21st to end	Night	55% 3 14% 18% 9%	1330
July	1st to 10th	Night	46% 5% 19% 25% 4	2175
	11th to 20th	Night	47% 5% 21% 22% 4	2382
	21st to end	Night	38% 6% 26% 21% 8%	2651
August	1st to 10th	Night	50% 5% 18% 23% 5%	2559
	11th to 20th	Night	53% 7% 20% 14% 6%	2809
	21st to end	Night	46% 3 15% 24% 11%	3148
September	1st to 10th	Night	45% 4 14% 26% 11% 1	1927
	11th to 20th	Night	46% 2 17% 24% 10% 1	2090
	21st to end	Night	45% 4 12% 28% 12%	2078
October	1st to 10th	Night	49% 2 10% 28% 11% 1	2012
	11th to 20th	Night	58% 3 13% 21% 5%	2278
	21st to end	Night	57% 3 12% 19% 8%	2574
November	1st to 10th	Night	58% 2 13% 20% 6% 1	2407
	11th to 20th	Night	59% 4 12% 18% 8%	2588
	21st to end	Night	64% 4 12% 14% 6%	2802
December	1st to 10th	Night	69% 2 9% 14% 5%	2850
	11th to 20th	Night	66% 3 8% 16% 6% 1	3532
	21st to end	Night	65% 2 11% 14% 7%	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	24% 14% 38% 18% 4 2	180
	11th to 20th	Day	24% 12% 37% 19% 7% 1	180
	21st to end	Day	16% 15% 34% 20% 12% 3	198
February	1st to 10th	Day	20% 15% 35% 21% 6% 3	227
	11th to 20th	Day	20% 13% 36% 25% 5%	408
	21st to end	Day	21% 12% 37% 22% 7% 1	382
March	1st to 10th	Day	28% 10% 29% 23% 9% 2	460
	11th to 20th	Day	27% 9% 28% 22% 12% 3	460
	21st to end	Day	28% 9% 30% 20% 9% 3	506
April	1st to 10th	Day	29% 11% 29% 23% 6% 2	460
	11th to 20th	Day	31% 10% 28% 21% 9% 2	452
	21st to end	Day	28% 10% 33% 19% 8% 2	460
May	1st to 10th	Day	27% 9% 29% 22% 10% 3	463
	11th to 20th	Day	22% 7% 29% 26% 14% 2	492
	21st to end	Day	23% 8% 36% 23% 10% 1	735
June	1st to 10th	Day	27% 5% 28% 27% 10% 3	680
	11th to 20th	Day	22% 6% 28% 27% 14% 3	680
	21st to end	Day	25% 4 25% 30% 14% 1	680
July	1st to 10th	Day	19% 6% 28% 31% 14% 2	670
	11th to 20th	Day	17% 5% 26% 32% 15% 4	534
	21st to end	Day	17% 4 26% 31% 19% 3	532
August	1st to 10th	Day	18% 4 29% 29% 15% 5%	486
	11th to 20th	Day	19% 3 23% 29% 22% 4	479
	21st to end	Day	17% 9% 25% 27% 15% 8%	539
September	1st to 10th	Day	18% 7% 27% 28% 16% 5%	490
	11th to 20th	Day	20% 9% 25% 28% 12% 5%	490
	21st to end	Day	20% 7% 25% 30% 13% 5%	483
October	1st to 10th	Day	20% 8% 29% 27% 12% 4	433
	11th to 20th	Day	33% 9% 23% 22% 12% 1	360
	21st to end	Day	35% 8% 28% 22% 6% 1	396
November	1st to 10th	Day	27% 12% 31% 24% 5% 1	365
	11th to 20th	Day	26% 12% 25% 26% 9% 2	370
	21st to end	Day	32% 12% 30% 22% 4	225
December	1st to 10th	Day	24% 14% 31% 19% 11% 1	180
	11th to 20th	Day	29% 13% 35% 18% 4 1	180
	21st to end	Day	29% 13% 34% 17% 6% 1	198
January	1st to 10th	Night	26% 10% 31% 25% 7% 1	812
	11th to 20th	Night	24% 9% 32% 28% 7% 1	760
	21st to end	Night	15% 7% 32% 34% 11% 1	836
February	1st to 10th	Night	19% 9% 37% 27% 8% 1	760
	11th to 20th	Night	23% 9% 31% 28% 8% 1	743
	21st to end	Night	23% 10% 29% 30% 8%	628
March	1st to 10th	Night	21% 7% 32% 32% 8% 1	760
	11th to 20th	Night	26% 8% 28% 27% 9% 1	760
	21st to end	Night	26% 6% 30% 27% 10% 2	836
April	1st to 10th	Night	33% 5% 27% 29% 6% 1	760
	11th to 20th	Night	27% 6% 28% 29% 9%	592
	21st to end	Night	32% 6% 26% 25% 9% 1	570
May	1st to 10th	Night	31% 3 26% 31% 8%	570
	11th to 20th	Night	26% 5% 22% 34% 12% 1	385
	21st to end	Night	27% 6% 29% 28% 9%	411
June	1st to 10th	Night	26% 3 22% 39% 9% 1	380
	11th to 20th	Night	21% 2 23% 36% 17% 1	380
	21st to end	Night	27% 3 26% 32% 12%	380
July	1st to 10th	Night	19% 4 28% 36% 11% 1	370
	11th to 20th	Night	15% 4 23% 41% 16% 2	368
	21st to end	Night	17% 2 17% 45% 18% 1	416
August	1st to 10th	Night	17% 1 17% 45% 18% 2	415
	11th to 20th	Night	19% 2 20% 39% 19% 1	562
	21st to end	Night	19% 3 21% 38% 17% 2	638
September	1st to 10th	Night	19% 4 27% 34% 14% 2	760
	11th to 20th	Night	23% 3 24% 32% 15% 2	760
	21st to end	Night	23% 4 23% 35% 14% 1	756
October	1st to 10th	Night	25% 7% 25% 32% 10% 2	720
	11th to 20th	Night	32% 5% 25% 26% 12% 1	720
	21st to end	Night	31% 7% 27% 26% 9% 1	792
November	1st to 10th	Night	29% 11% 29% 24% 7% 1	740
	11th to 20th	Night	29% 10% 29% 23% 9% 1	816
	21st to end	Night	27% 9% 31% 25% 7% 1	850
December	1st to 10th	Night	31% 9% 28% 24% 7% 1	850
	11th to 20th	Night	28% 9% 32% 25% 6% 1	850
	21st to end	Night	30% 10% 28% 22% 9% 1	935

Page generated at 2024-09-26 09:52:18. Version ac07

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