Les Escoumins
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Les Escoumins clear sky chart from 2005-11-06 to 2026-07-01.

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% 10% 3 8% 5% 5% 5% 4 5% 7% 32%	138013
	Night	15% 11% 4 9% 5% 4 4 3 5% 6% 33%	134491
Transparency	Day	52% 6% 13% 20% 10% 1	141445
	Night	52% 5% 12% 20% 10% 1	139149
Seeing	Day	22% 12% 31% 24% 9% 2	17861
	Night	22% 9% 30% 28% 10% 1	25923

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% 18% 5% 10% 6% 4 3 3 4 5% 25%	4093
	11th to 20th	Day	8% 14% 5% 14% 7% 6% 5% 4 5% 6% 25%	4650
	21st to end	Day	3 8% 5% 14% 8% 6% 5% 4 6% 7% 32%	5124
February	1st to 10th	Day	7% 12% 5% 11% 7% 6% 6% 4 6% 7% 29%	1723
	11th to 20th	Day	11% 16% 6% 12% 8% 4 4 3 4 5% 28%	1901
	21st to end	Day	11% 11% 3 11% 6% 5% 5% 4 6% 7% 31%	1730
March	1st to 10th	Day	16% 15% 4 10% 5% 4 5% 4 5% 6% 27%	4576
	11th to 20th	Day	15% 17% 4 10% 6% 5% 5% 4 5% 7% 21%	5012
	21st to end	Day	16% 18% 5% 9% 5% 4 3 2 4 5% 30%	5723
April	1st to 10th	Day	19% 13% 3 10% 5% 4 5% 3 4 6% 27%	2520
	11th to 20th	Day	18% 9% 3 7% 5% 4 4 3 5% 7% 35%	2701
	21st to end	Day	21% 11% 2 6% 4 4 5% 4 4 6% 33%	2730
May	1st to 10th	Day	21% 11% 4 7% 5% 5% 4 3 4 6% 32%	7716
	11th to 20th	Day	23% 8% 3 6% 4 4 4 3 5% 6% 35%	8477
	21st to end	Day	20% 9% 3 7% 5% 5% 5% 3 5% 7% 31%	9716
June	1st to 10th	Day	20% 8% 3 7% 6% 5% 5% 3 5% 7% 31%	3150
	11th to 20th	Day	18% 7% 3 6% 5% 4 5% 5% 7% 8% 33%	3150
	21st to end	Day	22% 8% 3 7% 5% 5% 5% 4 6% 7% 28%	3150
July	1st to 10th	Day	15% 7% 3 6% 5% 6% 6% 4 8% 9% 31%	6820
	11th to 20th	Day	15% 6% 2 7% 5% 5% 6% 5% 7% 8% 33%	6695
	21st to end	Day	9% 5% 2 6% 5% 6% 6% 5% 6% 8% 42%	6926
August	1st to 10th	Day	12% 5% 2 8% 5% 5% 7% 5% 8% 9% 34%	4478
	11th to 20th	Day	17% 7% 3 7% 6% 5% 5% 5% 6% 8% 31%	4175
	21st to end	Day	14% 6% 3 7% 5% 5% 5% 4 6% 7% 38%	4675
September	1st to 10th	Day	15% 6% 2 7% 4 5% 4 4 6% 8% 40%	2390
	11th to 20th	Day	17% 5% 2 6% 3 4 5% 3 6% 6% 44%	2200
	21st to end	Day	19% 7% 2 6% 4 4 3 3 5% 7% 39%	2200
October	1st to 10th	Day	17% 8% 2 7% 5% 5% 4 4 5% 6% 37%	2140
	11th to 20th	Day	22% 8% 3 7% 5% 4 4 4 5% 6% 31%	1870
	21st to end	Day	25% 12% 3 8% 5% 4 4 3 4 5% 29%	1980
November	1st to 10th	Day	16% 12% 4 9% 6% 5% 6% 4 5% 6% 28%	1851
	11th to 20th	Day	19% 12% 4 9% 4 5% 5% 4 5% 4 30%	1685
	21st to end	Day	22% 15% 5% 7% 4 4 5% 3 4 4 27%	1495
December	1st to 10th	Day	15% 15% 5% 9% 5% 3 3 3 4 4 33%	2350
	11th to 20th	Day	17% 11% 4 9% 6% 5% 5% 3 4 5% 32%	2688
	21st to end	Day	17% 12% 4 9% 5% 3 3 2 3 5% 38%	3553
January	1st to 10th	Night	14% 18% 5% 11% 6% 4 4 3 4 5% 26%	8813
	11th to 20th	Night	8% 17% 6% 15% 6% 5% 5% 4 5% 6% 24%	8235
	21st to end	Night	3 8% 3 11% 6% 6% 6% 5% 7% 8% 37%	9057
February	1st to 10th	Night	8% 13% 5% 10% 7% 5% 4 3 5% 7% 34%	2896
	11th to 20th	Night	10% 16% 6% 11% 6% 4 4 3 5% 4 30%	2603
	21st to end	Night	11% 15% 4 8% 5% 5% 5% 4 4 5% 35%	2076
March	1st to 10th	Night	16% 14% 4 8% 5% 4 5% 4 4 5% 30%	5484
	11th to 20th	Night	15% 17% 5% 11% 5% 4 4 4 5% 6% 24%	5167
	21st to end	Night	17% 17% 4 9% 5% 4 3 2 4 5% 32%	5448
April	1st to 10th	Night	22% 14% 4 10% 5% 4 4 2 3 4 30%	2100
	11th to 20th	Night	19% 10% 2 5% 5% 3 5% 4 5% 6% 35%	1868
	21st to end	Night	23% 9% 4 7% 4 3 3 3 5% 5% 34%	1890
May	1st to 10th	Night	21% 10% 3 7% 4 4 4 3 5% 6% 34%	5225
	11th to 20th	Night	24% 9% 3 7% 4 3 3 3 5% 6% 33%	4396
	21st to end	Night	18% 8% 2 7% 5% 5% 6% 4 5% 6% 33%	4491
June	1st to 10th	Night	19% 6% 3 7% 6% 5% 4 5% 6% 7% 31%	1470
	11th to 20th	Night	19% 7% 2 6% 4 4 5% 3 6% 6% 38%	1470
	21st to end	Night	26% 7% 3 6% 5% 5% 4 3 5% 6% 30%	1470
July	1st to 10th	Night	12% 5% 2 7% 5% 6% 5% 5% 8% 10% 35%	3160
	11th to 20th	Night	13% 6% 3 6% 5% 5% 5% 4 7% 8% 36%	3263
	21st to end	Night	11% 5% 2 6% 4 4 4 4 6% 8% 46%	3926
August	1st to 10th	Night	16% 5% 2 7% 6% 5% 5% 4 6% 7% 37%	2639
	11th to 20th	Night	14% 7% 3 9% 6% 6% 5% 5% 6% 8% 32%	2872
	21st to end	Night	16% 6% 2 6% 4 4 4 3 5% 6% 44%	3223
September	1st to 10th	Night	14% 6% 3 6% 5% 4 4 4 5% 8% 42%	2008
	11th to 20th	Night	18% 5% 2 6% 4 4 4 3 4 6% 43%	2200
	21st to end	Night	18% 6% 2 5% 4 4 3 3 4 5% 45%	2200
October	1st to 10th	Night	17% 7% 2 6% 4 4 4 3 4 6% 42%	2260
	11th to 20th	Night	22% 8% 2 7% 5% 4 5% 3 4 6% 34%	2529
	21st to end	Night	22% 9% 3 7% 4 5% 4 3 5% 7% 32%	2860
November	1st to 10th	Night	18% 11% 3 7% 5% 5% 5% 3 5% 5% 33%	2667
	11th to 20th	Night	20% 11% 3 8% 5% 4 4 4 4 5% 32%	2933
	21st to end	Night	20% 14% 5% 10% 5% 4 4 3 5% 6% 26%	3124
December	1st to 10th	Night	13% 13% 6% 10% 5% 4 4 3 4 4 33%	5060
	11th to 20th	Night	18% 12% 4 8% 5% 4 4 3 5% 6% 32%	5741
	21st to end	Night	14% 13% 5% 10% 5% 4 3 3 3 5% 35%	7667

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	62% 4 9% 19% 6%	4094
	11th to 20th	Day	61% 3 10% 18% 8% 1	4680
	21st to end	Day	50% 5% 10% 19% 16%	5124
February	1st to 10th	Day	52% 7% 11% 17% 11% 3	1723
	11th to 20th	Day	60% 4 9% 14% 12% 1	1909
	21st to end	Day	50% 7% 8% 21% 12% 2	1730
March	1st to 10th	Day	56% 7% 11% 10% 12% 3	4579
	11th to 20th	Day	61% 7% 10% 13% 8% 1	5012
	21st to end	Day	58% 3 7% 17% 11% 3	5723
April	1st to 10th	Day	57% 5% 9% 15% 11% 2	2520
	11th to 20th	Day	48% 6% 12% 22% 10% 2	2701
	21st to end	Day	52% 6% 10% 18% 13% 2	2730
May	1st to 10th	Day	54% 5% 12% 17% 10% 1	7728
	11th to 20th	Day	51% 5% 12% 22% 8% 2	8481
	21st to end	Day	53% 4 11% 19% 12% 2	9717
June	1st to 10th	Day	51% 7% 11% 18% 11% 1	3150
	11th to 20th	Day	48% 7% 13% 19% 11% 2	3150
	21st to end	Day	55% 8% 12% 15% 9% 1	3150
July	1st to 10th	Day	48% 5% 12% 26% 9%	6745
	11th to 20th	Day	47% 5% 19% 23% 6%	6614
	21st to end	Day	40% 5% 14% 29% 11%	6728
August	1st to 10th	Day	44% 8% 17% 21% 9%	4464
	11th to 20th	Day	50% 8% 17% 20% 4	4214
	21st to end	Day	44% 6% 18% 20% 11% 1	4675
September	1st to 10th	Day	41% 8% 17% 23% 10%	2390
	11th to 20th	Day	39% 8% 15% 27% 10% 1	2200
	21st to end	Day	45% 6% 15% 23% 10%	2200
October	1st to 10th	Day	53% 4 14% 21% 7% 1	3491
	11th to 20th	Day	48% 6% 14% 28% 4	3021
	21st to end	Day	49% 5% 16% 18% 12%	3180
November	1st to 10th	Day	56% 7% 14% 16% 7% 1	1851
	11th to 20th	Day	54% 7% 14% 18% 7%	1685
	21st to end	Day	62% 5% 12% 14% 7%	1495
December	1st to 10th	Day	56% 5% 10% 17% 12%	2350
	11th to 20th	Day	56% 4 10% 20% 10%	2688
	21st to end	Day	52% 3 13% 20% 9% 3	3553
January	1st to 10th	Night	63% 3 11% 17% 6%	8813
	11th to 20th	Night	63% 4 9% 18% 6%	8280
	21st to end	Night	44% 6% 11% 22% 17%	9057
February	1st to 10th	Night	51% 6% 10% 19% 13% 2	2896
	11th to 20th	Night	57% 7% 8% 18% 10% 1	2606
	21st to end	Night	52% 5% 9% 22% 10% 1	2076
March	1st to 10th	Night	56% 7% 10% 13% 13% 1	5494
	11th to 20th	Night	62% 4 11% 13% 9% 2	5168
	21st to end	Night	56% 4 7% 15% 17% 1	5448
April	1st to 10th	Night	60% 3 8% 14% 13% 3	2100
	11th to 20th	Night	50% 5% 9% 18% 16% 1	1868
	21st to end	Night	53% 4 8% 20% 13% 2	1890
May	1st to 10th	Night	52% 5% 10% 19% 13% 1	5231
	11th to 20th	Night	52% 4 10% 22% 10% 1	4397
	21st to end	Night	50% 5% 10% 19% 15% 1	4492
June	1st to 10th	Night	49% 8% 10% 20% 10% 2	1470
	11th to 20th	Night	46% 7% 12% 18% 13% 3	1470
	21st to end	Night	54% 8% 10% 16% 11% 1	1470
July	1st to 10th	Night	44% 5% 17% 24% 9%	3125
	11th to 20th	Night	45% 5% 19% 26% 4	3221
	21st to end	Night	38% 5% 21% 24% 11%	3809
August	1st to 10th	Night	46% 7% 14% 24% 8%	2629
	11th to 20th	Night	50% 9% 19% 14% 7%	2899
	21st to end	Night	41% 6% 13% 29% 11%	3223
September	1st to 10th	Night	40% 8% 16% 25% 10% 1	2008
	11th to 20th	Night	43% 7% 16% 23% 10% 1	2200
	21st to end	Night	42% 7% 12% 27% 12%	2200
October	1st to 10th	Night	47% 4 11% 28% 9% 1	3689
	11th to 20th	Night	49% 4 12% 31% 5%	4117
	21st to end	Night	47% 7% 15% 20% 10%	4610
November	1st to 10th	Night	53% 6% 12% 19% 9% 1	2667
	11th to 20th	Night	54% 7% 13% 19% 8% 1	2933
	21st to end	Night	60% 6% 11% 14% 9%	3124
December	1st to 10th	Night	56% 4 12% 21% 8%	5060
	11th to 20th	Night	54% 5% 10% 22% 9%	5742
	21st to end	Night	54% 5% 10% 20% 9% 1	7667

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	30% 13% 30% 18% 8% 1	220
	11th to 20th	Day	20% 20% 30% 20% 9% 2	220
	21st to end	Day	12% 17% 31% 26% 12% 2	242
February	1st to 10th	Day	11% 18% 34% 27% 6% 3	263
	11th to 20th	Day	18% 14% 37% 25% 6%	456
	21st to end	Day	17% 15% 38% 23% 5% 1	446
March	1st to 10th	Day	26% 15% 31% 20% 7%	540
	11th to 20th	Day	22% 20% 28% 19% 10% 1	540
	21st to end	Day	25% 15% 36% 17% 6% 1	594
April	1st to 10th	Day	26% 18% 32% 18% 4 1	540
	11th to 20th	Day	24% 12% 34% 22% 6% 2	532
	21st to end	Day	26% 13% 31% 24% 6% 2	540
May	1st to 10th	Day	27% 13% 32% 17% 10% 1	543
	11th to 20th	Day	24% 10% 33% 22% 9% 2	654
	21st to end	Day	24% 13% 32% 22% 9% 1	845
June	1st to 10th	Day	24% 9% 33% 24% 8% 2	780
	11th to 20th	Day	22% 11% 29% 22% 14% 3	780
	21st to end	Day	24% 9% 28% 27% 11% 1	780
July	1st to 10th	Day	20% 6% 31% 29% 11% 2	720
	11th to 20th	Day	15% 9% 29% 33% 13% 1	671
	21st to end	Day	15% 8% 29% 32% 13% 2	576
August	1st to 10th	Day	17% 7% 28% 33% 12% 2	526
	11th to 20th	Day	18% 5% 28% 31% 15% 3	519
	21st to end	Day	16% 11% 28% 27% 15% 4	583
September	1st to 10th	Day	17% 10% 33% 25% 13% 3	530
	11th to 20th	Day	20% 8% 33% 28% 8% 4	530
	21st to end	Day	22% 8% 30% 26% 8% 4	530
October	1st to 10th	Day	19% 10% 35% 24% 8% 4	497
	11th to 20th	Day	27% 13% 26% 20% 11% 2	420
	21st to end	Day	32% 13% 28% 20% 7% 1	462
November	1st to 10th	Day	25% 16% 35% 19% 4	425
	11th to 20th	Day	25% 13% 31% 21% 8% 1	430
	21st to end	Day	33% 16% 29% 16% 5%	245
December	1st to 10th	Day	25% 12% 31% 20% 10% 2	220
	11th to 20th	Day	25% 22% 30% 15% 6% 1	220
	21st to end	Day	23% 19% 26% 22% 8% 1	242
January	1st to 10th	Night	24% 11% 34% 26% 5%	947
	11th to 20th	Night	20% 14% 34% 25% 8%	840
	21st to end	Night	14% 9% 39% 31% 7% 1	924
February	1st to 10th	Night	14% 10% 40% 27% 8% 1	840
	11th to 20th	Night	19% 14% 33% 28% 6%	823
	21st to end	Night	19% 10% 31% 30% 9% 1	692
March	1st to 10th	Night	21% 10% 35% 27% 6% 1	840
	11th to 20th	Night	20% 15% 34% 22% 8% 1	840
	21st to end	Night	21% 12% 33% 27% 6% 1	924
April	1st to 10th	Night	28% 11% 28% 24% 7% 1	840
	11th to 20th	Night	24% 8% 31% 28% 7% 1	624
	21st to end	Night	28% 7% 26% 29% 10% 1	630
May	1st to 10th	Night	26% 7% 25% 32% 9%	622
	11th to 20th	Night	25% 4 27% 30% 13% 1	414
	21st to end	Night	22% 6% 30% 30% 11% 1	455
June	1st to 10th	Night	22% 4 25% 37% 11%	420
	11th to 20th	Night	21% 4 21% 34% 19% 2	420
	21st to end	Night	27% 5% 20% 33% 12% 2	420
July	1st to 10th	Night	20% 3 26% 35% 14% 2	390
	11th to 20th	Night	13% 5% 22% 43% 16% 1	388
	21st to end	Night	17% 2 23% 40% 16% 2	438
August	1st to 10th	Night	16% 3 20% 36% 23% 1	425
	11th to 20th	Night	18% 4 21% 36% 20% 2	592
	21st to end	Night	16% 4 22% 38% 18% 2	660
September	1st to 10th	Night	17% 5% 28% 34% 14% 2	773
	11th to 20th	Night	21% 4 27% 30% 15% 3	800
	21st to end	Night	21% 4 28% 31% 14% 2	800
October	1st to 10th	Night	20% 8% 28% 31% 12% 2	800
	11th to 20th	Night	26% 8% 28% 25% 13% 1	800
	21st to end	Night	26% 10% 30% 26% 8%	880
November	1st to 10th	Night	24% 13% 32% 23% 7%	820
	11th to 20th	Night	26% 12% 32% 22% 7% 1	947
	21st to end	Night	26% 11% 34% 24% 6% 1	950
December	1st to 10th	Night	23% 11% 34% 24% 8% 1	950
	11th to 20th	Night	23% 13% 34% 22% 6% 1	950
	21st to end	Night	24% 12% 34% 22% 7% 1	1045

Page generated at 2026-06-28 02:10:47. Version ac07

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