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 2025-02-25.

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%	108300
	Night	15% 11% 4 9% 5% 4 4 3 5% 6% 33%	110466
Transparency	Day	50% 7% 13% 20% 9% 1	111778
	Night	52% 6% 12% 20% 10% 1	115153
Seeing	Day	21% 11% 31% 25% 10% 2	16002
	Night	22% 9% 30% 28% 10% 1	24268

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	18% 20% 5% 10% 6% 4 3 3 4 5% 22%	3157
	11th to 20th	Day	8% 13% 5% 15% 8% 6% 5% 3 5% 5% 26%	3570
	21st to end	Day	4 7% 4 12% 8% 7% 6% 4 5% 7% 35%	3960
February	1st to 10th	Day	7% 12% 5% 11% 7% 5% 6% 5% 6% 7% 28%	1641
	11th to 20th	Day	11% 16% 5% 12% 8% 4 4 3 4 5% 27%	1808
	21st to end	Day	11% 11% 3 11% 5% 5% 5% 4 6% 7% 31%	1610
March	1st to 10th	Day	13% 12% 3 9% 5% 5% 6% 4 5% 7% 30%	3116
	11th to 20th	Day	17% 20% 4 9% 5% 5% 4 3 4 6% 21%	3432
	21st to end	Day	15% 18% 5% 8% 4 4 3 2 4 5% 31%	3907
April	1st to 10th	Day	19% 13% 3 10% 5% 4 5% 4 4 6% 27%	2280
	11th to 20th	Day	17% 9% 3 7% 5% 4 4 4 6% 7% 35%	2441
	21st to end	Day	21% 11% 2 6% 4 4 5% 4 4 6% 33%	2470
May	1st to 10th	Day	15% 10% 4 8% 5% 4 4 3 4 6% 35%	4156
	11th to 20th	Day	18% 8% 3 6% 4 4 4 3 6% 7% 37%	4542
	21st to end	Day	17% 9% 4 8% 5% 5% 5% 4 6% 7% 30%	5185
June	1st to 10th	Day	20% 8% 3 7% 6% 5% 5% 3 5% 7% 31%	2850
	11th to 20th	Day	18% 7% 3 6% 5% 4 4 5% 7% 8% 34%	2850
	21st to end	Day	22% 8% 3 8% 5% 5% 4 4 6% 7% 28%	2850
July	1st to 10th	Day	15% 7% 3 6% 5% 5% 6% 4 8% 8% 33%	4760
	11th to 20th	Day	12% 6% 3 7% 6% 6% 6% 5% 7% 8% 34%	4677
	21st to end	Day	10% 5% 2 6% 6% 6% 6% 5% 7% 8% 38%	4814
August	1st to 10th	Day	12% 6% 2 8% 6% 6% 7% 5% 8% 9% 33%	4341
	11th to 20th	Day	17% 7% 3 8% 6% 5% 5% 5% 6% 8% 30%	4045
	21st to end	Day	14% 6% 3 7% 5% 5% 5% 4 6% 7% 39%	4532
September	1st to 10th	Day	15% 6% 2 7% 5% 5% 4 4 6% 7% 39%	2271
	11th to 20th	Day	17% 5% 2 6% 3 4 5% 3 6% 6% 43%	2090
	21st to end	Day	20% 7% 2 6% 4 4 3 3 5% 7% 39%	2090
October	1st to 10th	Day	18% 8% 3 7% 5% 5% 5% 4 5% 6% 36%	2033
	11th to 20th	Day	23% 8% 3 7% 5% 4 4 4 5% 6% 30%	1777
	21st to end	Day	24% 11% 3 8% 5% 4 4 3 4 5% 30%	1881
November	1st to 10th	Day	16% 12% 4 9% 6% 5% 6% 4 5% 6% 29%	1761
	11th to 20th	Day	20% 11% 3 9% 4 4 5% 4 5% 4 30%	1605
	21st to end	Day	22% 15% 5% 7% 4 4 5% 3 4 4 27%	1424
December	1st to 10th	Day	16% 15% 6% 9% 5% 3 4 3 4 4 33%	2280
	11th to 20th	Day	17% 11% 4 9% 6% 5% 5% 3 4 5% 32%	2618
	21st to end	Day	17% 12% 4 9% 4 3 3 2 3 5% 38%	3476
January	1st to 10th	Night	16% 21% 5% 11% 5% 4 4 3 4 4 23%	6790
	11th to 20th	Night	9% 16% 6% 16% 6% 5% 4 3 4 6% 26%	6315
	21st to end	Night	4 8% 3 9% 6% 6% 5% 5% 6% 8% 39%	6996
February	1st to 10th	Night	9% 13% 4 10% 7% 5% 4 4 5% 7% 33%	2758
	11th to 20th	Night	10% 16% 6% 11% 6% 4 5% 3 5% 5% 29%	2476
	21st to end	Night	11% 15% 4 8% 5% 5% 5% 4 4 5% 34%	1939
March	1st to 10th	Night	13% 13% 4 9% 6% 5% 6% 5% 5% 5% 28%	3724
	11th to 20th	Night	17% 20% 5% 10% 5% 4 4 3 4 5% 24%	3527
	21st to end	Night	17% 16% 4 9% 4 4 3 2 5% 5% 30%	3722
April	1st to 10th	Night	22% 14% 4 10% 5% 3 4 2 3 4 30%	1900
	11th to 20th	Night	20% 10% 2 5% 5% 3 5% 4 5% 6% 35%	1688
	21st to end	Night	23% 9% 4 7% 4 3 3 2 4 6% 35%	1710
May	1st to 10th	Night	19% 8% 2 7% 4 4 4 3 5% 6% 37%	2814
	11th to 20th	Night	19% 9% 2 7% 4 3 3 3 5% 7% 37%	2356
	21st to end	Night	17% 7% 3 8% 6% 5% 5% 4 7% 7% 30%	2401
June	1st to 10th	Night	19% 7% 3 8% 6% 5% 4 5% 6% 7% 30%	1330
	11th to 20th	Night	17% 7% 2 6% 4 4 4 4 7% 6% 39%	1330
	21st to end	Night	27% 7% 3 5% 4 5% 4 3 5% 5% 31%	1330
July	1st to 10th	Night	15% 5% 2 6% 5% 5% 4 5% 8% 9% 35%	2210
	11th to 20th	Night	11% 5% 3 7% 5% 5% 6% 4 8% 8% 38%	2287
	21st to end	Night	11% 5% 2 6% 3 4 5% 5% 6% 8% 45%	2739
August	1st to 10th	Night	17% 6% 2 7% 6% 5% 5% 4 6% 7% 36%	2557
	11th to 20th	Night	14% 7% 3 9% 6% 6% 6% 5% 6% 7% 31%	2782
	21st to end	Night	16% 6% 2 6% 4 4 4 3 5% 6% 45%	3124
September	1st to 10th	Night	15% 6% 3 6% 5% 5% 4 4 5% 7% 41%	1907
	11th to 20th	Night	19% 6% 2 6% 4 4 4 3 4 6% 42%	2090
	21st to end	Night	18% 6% 2 6% 4 4 3 3 4 5% 45%	2090
October	1st to 10th	Night	17% 7% 2 6% 4 4 4 3 5% 7% 41%	2147
	11th to 20th	Night	23% 8% 2 7% 4 4 5% 3 4 6% 33%	2402
	21st to end	Night	22% 8% 2 7% 4 5% 4 3 5% 7% 32%	2717
November	1st to 10th	Night	18% 11% 3 7% 5% 5% 5% 3 5% 5% 33%	2537
	11th to 20th	Night	20% 11% 3 8% 5% 4 5% 4 4 5% 31%	2793
	21st to end	Night	20% 14% 4 9% 4 4 4 3 5% 6% 27%	2975
December	1st to 10th	Night	13% 14% 6% 10% 5% 4 4 3 4 4 33%	4910
	11th to 20th	Night	19% 12% 3 7% 5% 4 4 3 5% 6% 33%	5591
	21st to end	Night	14% 13% 5% 10% 5% 4 3 3 4 5% 35%	7502

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	66% 6% 9% 15% 4	3158
	11th to 20th	Day	60% 4 10% 18% 7% 1	3600
	21st to end	Day	47% 6% 10% 18% 18%	3960
February	1st to 10th	Day	53% 8% 10% 16% 10% 3	1641
	11th to 20th	Day	60% 5% 9% 13% 12% 1	1816
	21st to end	Day	50% 7% 9% 20% 12% 2	1610
March	1st to 10th	Day	49% 11% 15% 13% 9% 2	3119
	11th to 20th	Day	62% 8% 9% 13% 7% 1	3432
	21st to end	Day	56% 5% 9% 18% 10% 3	3907
April	1st to 10th	Day	57% 6% 10% 14% 11% 2	2280
	11th to 20th	Day	47% 6% 12% 22% 10% 2	2441
	21st to end	Day	52% 6% 9% 18% 13% 2	2470
May	1st to 10th	Day	48% 9% 15% 17% 11% 1	4170
	11th to 20th	Day	45% 9% 14% 22% 8% 1	4546
	21st to end	Day	50% 7% 12% 22% 9% 1	5185
June	1st to 10th	Day	52% 8% 11% 17% 11% 1	2850
	11th to 20th	Day	46% 8% 14% 19% 11% 2	2850
	21st to end	Day	55% 8% 12% 16% 9% 1	2850
July	1st to 10th	Day	46% 7% 14% 25% 8%	4685
	11th to 20th	Day	45% 6% 19% 24% 6%	4596
	21st to end	Day	43% 8% 16% 25% 8%	4661
August	1st to 10th	Day	45% 8% 17% 21% 9%	4327
	11th to 20th	Day	51% 8% 17% 19% 4	4084
	21st to end	Day	44% 6% 18% 20% 11% 1	4532
September	1st to 10th	Day	42% 8% 16% 22% 10%	2271
	11th to 20th	Day	40% 8% 15% 27% 10%	2090
	21st to end	Day	45% 7% 16% 22% 10%	2090
October	1st to 10th	Day	54% 5% 13% 20% 7% 1	3384
	11th to 20th	Day	48% 6% 14% 28% 4	2928
	21st to end	Day	49% 5% 16% 18% 12%	3081
November	1st to 10th	Day	56% 7% 14% 16% 7% 1	1761
	11th to 20th	Day	54% 7% 14% 18% 7%	1605
	21st to end	Day	62% 6% 12% 14% 7%	1424
December	1st to 10th	Day	56% 6% 10% 17% 11%	2280
	11th to 20th	Day	56% 4 9% 20% 10%	2618
	21st to end	Day	52% 4 13% 20% 9% 3	3476
January	1st to 10th	Night	66% 4 10% 12% 7%	6790
	11th to 20th	Night	61% 5% 10% 19% 6%	6360
	21st to end	Night	41% 8% 11% 22% 17%	6996
February	1st to 10th	Night	52% 6% 9% 17% 13% 2	2758
	11th to 20th	Night	57% 7% 8% 17% 10% 1	2479
	21st to end	Night	52% 6% 10% 21% 10% 1	1939
March	1st to 10th	Night	55% 10% 12% 14% 8% 1	3734
	11th to 20th	Night	64% 5% 10% 13% 8% 1	3528
	21st to end	Night	56% 5% 10% 16% 12% 1	3722
April	1st to 10th	Night	60% 3 8% 13% 13% 3	1900
	11th to 20th	Night	50% 6% 9% 18% 16% 1	1688
	21st to end	Night	52% 5% 8% 20% 13% 2	1710
May	1st to 10th	Night	46% 8% 14% 16% 15% 1	2820
	11th to 20th	Night	45% 8% 14% 21% 11% 1	2357
	21st to end	Night	48% 9% 11% 22% 10% 1	2402
June	1st to 10th	Night	50% 9% 10% 19% 10% 2	1330
	11th to 20th	Night	44% 8% 12% 19% 14% 3	1330
	21st to end	Night	54% 8% 10% 16% 11% 1	1330
July	1st to 10th	Night	44% 6% 18% 25% 7%	2175
	11th to 20th	Night	42% 7% 19% 27% 5%	2245
	21st to end	Night	37% 7% 24% 18% 13%	2651
August	1st to 10th	Night	47% 7% 14% 24% 8%	2547
	11th to 20th	Night	51% 9% 20% 14% 7%	2809
	21st to end	Night	41% 7% 12% 29% 11%	3124
September	1st to 10th	Night	41% 9% 15% 24% 10% 1	1907
	11th to 20th	Night	44% 7% 16% 23% 10% 1	2090
	21st to end	Night	43% 7% 12% 26% 12%	2090
October	1st to 10th	Night	48% 4 11% 27% 9% 1	3576
	11th to 20th	Night	49% 4 12% 31% 4	3990
	21st to end	Night	47% 7% 16% 20% 10%	4467
November	1st to 10th	Night	53% 6% 13% 18% 10% 1	2537
	11th to 20th	Night	54% 7% 12% 18% 8% 1	2793
	21st to end	Night	60% 6% 11% 14% 9%	2975
December	1st to 10th	Night	56% 4 13% 20% 7%	4910
	11th to 20th	Night	54% 5% 9% 23% 9%	5592
	21st to end	Night	54% 5% 10% 20% 9% 1	7502

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	31% 14% 30% 18% 8% 1	200
	11th to 20th	Day	19% 19% 30% 21% 10% 2	200
	21st to end	Day	13% 17% 31% 25% 12% 2	220
February	1st to 10th	Day	12% 19% 34% 28% 5% 2	241
	11th to 20th	Day	18% 14% 36% 25% 6%	423
	21st to end	Day	17% 14% 38% 24% 6% 1	398
March	1st to 10th	Day	24% 15% 32% 21% 8%	460
	11th to 20th	Day	21% 17% 27% 22% 12% 1	460
	21st to end	Day	25% 13% 36% 18% 7% 1	506
April	1st to 10th	Day	24% 16% 32% 21% 5% 2	460
	11th to 20th	Day	21% 11% 35% 24% 7% 2	452
	21st to end	Day	23% 14% 31% 24% 6% 2	460
May	1st to 10th	Day	26% 12% 31% 18% 12% 1	463
	11th to 20th	Day	22% 8% 32% 25% 10% 3	566
	21st to end	Day	22% 13% 33% 23% 9% 1	735
June	1st to 10th	Day	25% 9% 33% 24% 8% 2	680
	11th to 20th	Day	20% 10% 30% 23% 14% 3	680
	21st to end	Day	22% 8% 29% 29% 11% 1	680
July	1st to 10th	Day	20% 6% 30% 30% 12% 2	670
	11th to 20th	Day	15% 8% 28% 34% 14% 1	624
	21st to end	Day	15% 7% 28% 34% 14% 3	532
August	1st to 10th	Day	18% 7% 27% 34% 12% 2	486
	11th to 20th	Day	18% 5% 27% 32% 15% 3	479
	21st to end	Day	16% 10% 27% 27% 16% 4	539
September	1st to 10th	Day	17% 10% 33% 26% 13% 2	490
	11th to 20th	Day	21% 7% 33% 29% 7% 3	490
	21st to end	Day	22% 8% 30% 26% 9% 4	490
October	1st to 10th	Day	20% 9% 34% 24% 9% 4	460
	11th to 20th	Day	27% 14% 27% 20% 11% 2	390
	21st to end	Day	31% 14% 29% 19% 7% 1	429
November	1st to 10th	Day	24% 15% 36% 20% 4 1	395
	11th to 20th	Day	26% 14% 30% 21% 9% 1	400
	21st to end	Day	32% 16% 29% 17% 5%	224
December	1st to 10th	Day	26% 11% 30% 20% 11% 3	200
	11th to 20th	Day	25% 22% 30% 17% 6% 1	200
	21st to end	Day	24% 20% 24% 22% 9% 1	220
January	1st to 10th	Night	24% 11% 34% 25% 5%	897
	11th to 20th	Night	19% 14% 34% 25% 8%	800
	21st to end	Night	14% 9% 38% 32% 7% 1	880
February	1st to 10th	Night	14% 11% 41% 26% 7% 1	800
	11th to 20th	Night	19% 14% 33% 27% 6%	783
	21st to end	Night	20% 9% 32% 30% 9% 1	647
March	1st to 10th	Night	20% 10% 35% 28% 7% 1	760
	11th to 20th	Night	20% 15% 33% 23% 9% 1	760
	21st to end	Night	21% 12% 33% 27% 6% 1	836
April	1st to 10th	Night	28% 11% 27% 26% 8% 1	760
	11th to 20th	Night	24% 9% 29% 29% 8% 1	564
	21st to end	Night	28% 7% 25% 28% 10% 1	570
May	1st to 10th	Night	26% 6% 25% 33% 10%	563
	11th to 20th	Night	24% 4 26% 31% 14% 1	374
	21st to end	Night	21% 7% 31% 30% 10% 1	411
June	1st to 10th	Night	22% 4 24% 37% 12% 1	380
	11th to 20th	Night	18% 3 22% 34% 20% 2	380
	21st to end	Night	29% 5% 19% 34% 11% 2	380
July	1st to 10th	Night	20% 4 26% 34% 15% 2	370
	11th to 20th	Night	13% 4 21% 44% 17% 1	368
	21st to end	Night	18% 2 20% 42% 17% 2	416
August	1st to 10th	Night	17% 3 20% 35% 23% 1	403
	11th to 20th	Night	19% 4 20% 35% 20% 2	562
	21st to end	Night	15% 3 22% 38% 19% 2	627
September	1st to 10th	Night	17% 5% 28% 34% 14% 2	734
	11th to 20th	Night	22% 4 28% 29% 14% 3	760
	21st to end	Night	21% 4 28% 31% 14% 2	760
October	1st to 10th	Night	20% 8% 28% 31% 12% 2	760
	11th to 20th	Night	27% 8% 27% 24% 13% 1	760
	21st to end	Night	26% 10% 30% 26% 8%	836
November	1st to 10th	Night	24% 13% 32% 23% 7%	780
	11th to 20th	Night	25% 13% 32% 21% 7% 1	897
	21st to end	Night	26% 10% 33% 25% 5% 1	900
December	1st to 10th	Night	23% 11% 34% 24% 8% 1	900
	11th to 20th	Night	23% 14% 34% 22% 6% 1	900
	21st to end	Night	24% 12% 33% 22% 8% 1	990

Page generated at 2025-02-22 06:51:34. Version ac07

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