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 2024-02-10.

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	16% 9% 4 7% 6% 3 5% 5% 5% 7% 33%	77823
	Night	17% 11% 4 7% 6% 4 5% 5% 5% 6% 29%	81155
Transparency	Day	52% 3 13% 22% 10% 1	77519
	Night	57% 3 11% 19% 9% 1	80995
Seeing	Day	24% 8% 29% 25% 12% 3	14537
	Night	25% 6% 27% 30% 10% 1	22943

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% 9% 7% 4 6% 5% 5% 7% 21%	2334
	11th to 20th	Day	12% 12% 6% 9% 8% 4 5% 6% 5% 6% 27%	2520
	21st to end	Day	8% 8% 5% 9% 8% 4 6% 6% 6% 7% 32%	2772
February	1st to 10th	Day	8% 13% 5% 9% 9% 6% 6% 5% 6% 6% 26%	1558
	11th to 20th	Day	12% 15% 7% 11% 7% 3 5% 4 5% 6% 25%	1658
	21st to end	Day	12% 10% 3 8% 7% 4 6% 7% 6% 6% 30%	1480
March	1st to 10th	Day	13% 12% 5% 6% 7% 4 5% 5% 4 6% 31%	1797
	11th to 20th	Day	15% 12% 5% 8% 8% 4 5% 4 4 7% 29%	1935
	21st to end	Day	15% 12% 4 7% 5% 3 4 4 5% 6% 34%	2240
April	1st to 10th	Day	21% 11% 4 7% 6% 3 5% 4 4 7% 28%	2160
	11th to 20th	Day	18% 8% 3 6% 4 3 4 4 5% 6% 39%	2284
	21st to end	Day	24% 9% 3 4 5% 3 4 4 5% 6% 34%	2340
May	1st to 10th	Day	19% 8% 3 6% 5% 3 4 5% 5% 7% 35%	2344
	11th to 20th	Day	18% 7% 2 6% 6% 3 4 4 5% 7% 38%	2482
	21st to end	Day	19% 6% 3 5% 5% 4 5% 5% 6% 7% 36%	2919
June	1st to 10th	Day	19% 7% 3 5% 7% 4 5% 5% 6% 7% 33%	2700
	11th to 20th	Day	18% 6% 2 5% 5% 3 5% 5% 6% 8% 37%	2700
	21st to end	Day	19% 7% 3 6% 6% 3 5% 6% 5% 8% 31%	2700
July	1st to 10th	Day	14% 6% 3 6% 5% 3 5% 7% 7% 11% 35%	2700
	11th to 20th	Day	12% 6% 3 6% 6% 4 6% 6% 6% 8% 37%	2571
	21st to end	Day	11% 8% 3 5% 6% 3 4 5% 6% 9% 39%	2744
August	1st to 10th	Day	13% 6% 2 6% 6% 4 6% 7% 8% 10% 34%	2453
	11th to 20th	Day	12% 7% 3 5% 5% 3 4 4 6% 9% 42%	2304
	21st to end	Day	13% 5% 2 5% 5% 3 4 5% 6% 9% 42%	2561
September	1st to 10th	Day	14% 5% 3 5% 4 3 3 5% 5% 9% 43%	2134
	11th to 20th	Day	16% 5% 2 4 4 3 3 4 3 6% 49%	1980
	21st to end	Day	17% 6% 2 5% 4 3 3 5% 5% 8% 42%	1980
October	1st to 10th	Day	15% 6% 3 6% 6% 3 5% 4 6% 8% 37%	1947
	11th to 20th	Day	21% 9% 3 7% 6% 3 5% 4 6% 7% 30%	1679
	21st to end	Day	25% 12% 4 5% 6% 2 4 5% 5% 6% 26%	1782
November	1st to 10th	Day	17% 9% 4 7% 6% 3 6% 5% 5% 6% 32%	1671
	11th to 20th	Day	17% 11% 6% 8% 7% 4 4 5% 6% 7% 24%	1590
	21st to end	Day	19% 15% 3 8% 6% 4 6% 4 5% 4 25%	1375
December	1st to 10th	Day	18% 15% 5% 11% 10% 4 4 4 4 5% 20%	1330
	11th to 20th	Day	19% 14% 5% 9% 7% 4 4 5% 5% 3 26%	1668
	21st to end	Day	22% 13% 4 8% 5% 3 4 3 3 4 30%	2431
January	1st to 10th	Night	13% 16% 6% 9% 10% 5% 6% 6% 5% 5% 20%	4616
	11th to 20th	Night	11% 14% 5% 10% 9% 4 6% 5% 6% 6% 23%	4440
	21st to end	Night	8% 12% 6% 11% 7% 5% 5% 5% 6% 7% 27%	4884
February	1st to 10th	Night	10% 12% 6% 9% 8% 4 6% 5% 5% 6% 29%	2607
	11th to 20th	Night	12% 17% 5% 10% 8% 4 5% 4 4 5% 25%	2187
	21st to end	Night	14% 12% 5% 10% 6% 3 5% 4 5% 6% 29%	1776
March	1st to 10th	Night	15% 13% 5% 8% 6% 4 5% 5% 5% 6% 29%	2150
	11th to 20th	Night	17% 13% 6% 8% 6% 4 5% 4 4 5% 30%	2023
	21st to end	Night	16% 15% 4 6% 5% 3 5% 4 5% 5% 32%	2112
April	1st to 10th	Night	23% 14% 5% 8% 5% 3 4 4 5% 4 26%	1800
	11th to 20th	Night	20% 9% 2 6% 6% 3 5% 4 5% 6% 33%	1625
	21st to end	Night	28% 8% 3 5% 4 3 5% 4 3 5% 33%	1620
May	1st to 10th	Night	24% 10% 3 6% 5% 3 5% 4 4 6% 30%	1620
	11th to 20th	Night	22% 7% 3 4 5% 3 4 3 5% 6% 37%	1422
	21st to end	Night	22% 8% 3 6% 5% 3 4 5% 4 6% 35%	1356
June	1st to 10th	Night	20% 8% 4 8% 5% 3 5% 5% 5% 8% 29%	1260
	11th to 20th	Night	17% 7% 3 5% 4 3 5% 4 6% 8% 38%	1260
	21st to end	Night	21% 7% 3 7% 6% 3 5% 6% 5% 8% 30%	1260
July	1st to 10th	Night	16% 8% 2 6% 6% 4 5% 4 5% 8% 35%	1260
	11th to 20th	Night	13% 6% 3 5% 7% 5% 6% 6% 6% 8% 35%	1385
	21st to end	Night	13% 7% 3 6% 6% 4 6% 7% 6% 9% 33%	1574
August	1st to 10th	Night	13% 5% 4 6% 6% 4 6% 4 6% 8% 39%	1467
	11th to 20th	Night	15% 6% 3 6% 6% 5% 5% 5% 7% 10% 32%	1596
	21st to end	Night	14% 7% 3 5% 5% 3 5% 5% 5% 7% 41%	1792
September	1st to 10th	Night	16% 6% 2 5% 5% 4 5% 5% 5% 8% 39%	1825
	11th to 20th	Night	19% 7% 3 5% 5% 3 4 5% 5% 5% 40%	1980
	21st to end	Night	17% 8% 3 4 4 3 4 3 4 5% 44%	1980
October	1st to 10th	Night	18% 10% 2 6% 5% 3 4 4 4 5% 41%	2012
	11th to 20th	Night	24% 9% 4 6% 5% 3 5% 4 5% 6% 29%	2278
	21st to end	Night	24% 10% 3 6% 5% 3 4 4 5% 6% 29%	2574
November	1st to 10th	Night	19% 12% 4 6% 6% 3 4 5% 4 6% 30%	2407
	11th to 20th	Night	20% 11% 4 7% 6% 4 4 4 5% 7% 27%	2588
	21st to end	Night	18% 13% 6% 9% 6% 4 5% 4 5% 5% 24%	2802
December	1st to 10th	Night	19% 17% 6% 9% 7% 3 4 4 3 6% 20%	2850
	11th to 20th	Night	20% 14% 4 8% 8% 4 5% 5% 5% 6% 22%	3531
	21st to end	Night	20% 15% 5% 9% 6% 3 5% 4 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	1558
	11th to 20th	Day	61% 2 10% 16% 9% 1	1666
	21st to end	Day	54% 4 6% 22% 13% 2	1480
March	1st to 10th	Day	55% 3 9% 18% 12% 3	1800
	11th to 20th	Day	58% 2 9% 18% 12% 1	1935
	21st to end	Day	53% 2 10% 21% 11% 3	2240
April	1st to 10th	Day	59% 2 10% 16% 11% 3	2160
	11th to 20th	Day	49% 2 10% 25% 12% 2	2284
	21st to end	Day	53% 2 9% 20% 14% 2	2340
May	1st to 10th	Day	51% 2 11% 20% 14% 2	2344
	11th to 20th	Day	48% 2 11% 24% 14% 1	2486
	21st to end	Day	48% 4 12% 23% 12% 1	2919
June	1st to 10th	Day	51% 3 12% 21% 12% 1	2700
	11th to 20th	Day	46% 3 14% 25% 12% 1	2700
	21st to end	Day	52% 4 14% 20% 10% 1	2700
July	1st to 10th	Day	44% 4 19% 25% 8%	2625
	11th to 20th	Day	45% 3 16% 27% 8% 1	2493
	21st to end	Day	44% 4 19% 25% 8% 1	2591
August	1st to 10th	Day	45% 5% 21% 24% 5%	2439
	11th to 20th	Day	40% 3 20% 28% 9%	2304
	21st to end	Day	40% 4 17% 29% 11%	2561
September	1st to 10th	Day	41% 2 16% 28% 12% 1	2134
	11th to 20th	Day	39% 3 16% 28% 13% 1	1980
	21st to end	Day	43% 3 14% 29% 11%	1980
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	2607
	11th to 20th	Night	63% 3 9% 15% 9% 1	2190
	21st to end	Night	58% 2 7% 21% 11% 1	1776
March	1st to 10th	Night	58% 2 8% 21% 10% 1	2160
	11th to 20th	Night	59% 2 9% 18% 11% 1	2024
	21st to end	Night	57% 2 8% 21% 11% 2	2112
April	1st to 10th	Night	63% 2 5% 14% 13% 3	1800
	11th to 20th	Night	53% 2 8% 21% 14% 1	1625
	21st to end	Night	57% 2 6% 21% 13% 2	1620
May	1st to 10th	Night	57% 2 8% 17% 14% 2	1620
	11th to 20th	Night	50% 2 10% 24% 14% 2	1423
	21st to end	Night	52% 3 9% 21% 14% 2	1357
June	1st to 10th	Night	55% 3 12% 20% 9% 1	1260
	11th to 20th	Night	45% 3 12% 22% 15% 3	1260
	21st to end	Night	54% 3 14% 18% 9%	1260
July	1st to 10th	Night	47% 4 19% 24% 6%	1225
	11th to 20th	Night	46% 6% 15% 25% 7% 1	1341
	21st to end	Night	46% 5% 19% 21% 9%	1486
August	1st to 10th	Night	44% 4 20% 28% 4	1457
	11th to 20th	Night	47% 5% 19% 21% 8%	1596
	21st to end	Night	44% 2 17% 28% 9%	1792
September	1st to 10th	Night	45% 4 14% 25% 11% 1	1825
	11th to 20th	Night	47% 2 17% 23% 10% 1	1980
	21st to end	Night	44% 4 12% 28% 13%	1980
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% 34% 22% 6% 3	224
	11th to 20th	Day	21% 14% 35% 25% 5%	374
	21st to end	Day	23% 12% 35% 22% 8% 1	346
March	1st to 10th	Day	27% 10% 28% 24% 9% 2	420
	11th to 20th	Day	25% 9% 28% 22% 12% 4	420
	21st to end	Day	27% 9% 29% 21% 10% 4	462
April	1st to 10th	Day	29% 12% 28% 24% 6% 2	420
	11th to 20th	Day	31% 10% 27% 21% 9% 2	412
	21st to end	Day	28% 8% 33% 20% 9% 3	420
May	1st to 10th	Day	27% 8% 29% 23% 9% 4	423
	11th to 20th	Day	21% 7% 30% 26% 14% 2	451
	21st to end	Day	23% 8% 36% 22% 10% 1	680
June	1st to 10th	Day	27% 6% 28% 27% 10% 2	630
	11th to 20th	Day	23% 5% 27% 27% 15% 3	630
	21st to end	Day	24% 3 25% 32% 15% 2	630
July	1st to 10th	Day	18% 6% 28% 31% 15% 2	620
	11th to 20th	Day	17% 5% 25% 34% 16% 4	492
	21st to end	Day	18% 3 24% 31% 20% 3	488
August	1st to 10th	Day	18% 4 27% 30% 16% 5%	446
	11th to 20th	Day	19% 2 23% 29% 22% 5%	439
	21st to end	Day	18% 7% 26% 26% 15% 9%	495
September	1st to 10th	Day	18% 7% 26% 27% 18% 5%	450
	11th to 20th	Day	22% 10% 25% 26% 12% 5%	450
	21st to end	Day	21% 7% 24% 30% 12% 5%	450
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	18% 9% 36% 27% 8% 1	759
	11th to 20th	Night	24% 9% 30% 27% 8% 1	703
	21st to end	Night	23% 10% 27% 31% 8% 1	592
March	1st to 10th	Night	21% 6% 32% 31% 9% 1	720
	11th to 20th	Night	25% 8% 29% 27% 9% 1	720
	21st to end	Night	26% 6% 29% 27% 10% 2	792
April	1st to 10th	Night	33% 5% 27% 28% 7% 1	720
	11th to 20th	Night	27% 6% 28% 29% 10%	561
	21st to end	Night	34% 5% 25% 26% 10% 1	540
May	1st to 10th	Night	32% 3 25% 31% 9%	540
	11th to 20th	Night	27% 5% 23% 34% 10% 1	365
	21st to end	Night	28% 6% 30% 26% 10% 1	389
June	1st to 10th	Night	25% 3 22% 41% 8% 1	360
	11th to 20th	Night	22% 1 22% 36% 18% 1	360
	21st to end	Night	26% 3 25% 33% 13%	360
July	1st to 10th	Night	19% 3 28% 36% 12% 1	350
	11th to 20th	Night	16% 3 22% 42% 16% 2	348
	21st to end	Night	17% 2 16% 46% 18% 1	394
August	1st to 10th	Night	16% 2 16% 46% 19% 2	393
	11th to 20th	Night	19% 2 20% 39% 19% 2	532
	21st to end	Night	19% 2 21% 39% 17% 2	604
September	1st to 10th	Night	19% 3 26% 35% 14% 2	720
	11th to 20th	Night	25% 3 25% 31% 14% 2	720
	21st to end	Night	23% 4 24% 36% 12% 1	720
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 2024-02-07 06:11:57. Version ac07

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