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 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	16% 10% 3 8% 5% 5% 5% 4 5% 7% 33%	101391
	Night	16% 11% 4 8% 5% 4 4 3 5% 6% 33%	96914
Transparency	Day	50% 7% 13% 19% 9% 1	101137
	Night	51% 7% 13% 19% 10% 1	96789
Seeing	Day	21% 11% 31% 25% 10% 2	15618
	Night	21% 9% 30% 28% 10% 1	23613

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% 16% 5% 9% 6% 4 4 4 4 6% 28%	2207
	11th to 20th	Day	11% 14% 4 12% 6% 6% 5% 4 5% 5% 28%	2520
	21st to end	Day	6% 10% 5% 13% 9% 7% 6% 4 5% 6% 31%	2772
February	1st to 10th	Day	7% 13% 5% 11% 7% 5% 6% 4 6% 7% 29%	1558
	11th to 20th	Day	11% 15% 5% 12% 8% 4 4 3 5% 5% 27%	1715
	21st to end	Day	12% 11% 3 11% 5% 5% 5% 4 6% 7% 30%	1570
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% 38%	2070
October	1st to 10th	Day	17% 8% 2 6% 5% 5% 5% 4 5% 6% 37%	1926
	11th to 20th	Day	23% 7% 3 7% 5% 5% 4 5% 5% 6% 29%	1684
	21st to end	Day	25% 12% 3 8% 5% 4 4 3 4 5% 28%	1782
November	1st to 10th	Day	17% 12% 3 9% 6% 5% 5% 4 5% 5% 29%	1671
	11th to 20th	Day	19% 11% 3 9% 5% 5% 5% 4 6% 4 30%	1525
	21st to end	Day	20% 15% 5% 7% 5% 4 5% 3 4 4 28%	1353
December	1st to 10th	Day	18% 13% 5% 8% 6% 4 5% 4 5% 5% 26%	1330
	11th to 20th	Day	19% 14% 5% 8% 5% 4 3 2 3 4 33%	1668
	21st to end	Day	19% 13% 4 9% 4 3 2 2 3 4 38%	2431
January	1st to 10th	Night	11% 17% 6% 12% 5% 4 5% 3 4 5% 29%	4744
	11th to 20th	Night	11% 15% 6% 11% 5% 4 4 3 4 6% 30%	4440
	21st to end	Night	6% 12% 4 11% 6% 6% 5% 4 5% 7% 36%	4884
February	1st to 10th	Night	9% 13% 5% 10% 7% 5% 4 3 5% 7% 32%	2621
	11th to 20th	Night	10% 15% 6% 11% 7% 5% 5% 3 5% 4 29%	2349
	21st to end	Night	11% 15% 4 8% 5% 5% 5% 4 4 5% 33%	1884
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% 7% 2 5% 4 4 3 3 4 5% 44%	2078
October	1st to 10th	Night	16% 7% 2 6% 4 4 4 4 5% 6% 41%	2034
	11th to 20th	Night	24% 8% 2 7% 4 3 5% 3 4 6% 33%	2275
	21st to end	Night	23% 9% 2 7% 4 5% 4 3 4 7% 32%	2574
November	1st to 10th	Night	17% 12% 3 7% 5% 5% 5% 3 5% 5% 33%	2407
	11th to 20th	Night	19% 11% 3 8% 5% 4 4 4 4 6% 31%	2653
	21st to end	Night	18% 13% 4 10% 5% 4 4 3 5% 6% 28%	2826
December	1st to 10th	Night	17% 14% 5% 8% 5% 4 4 3 4 5% 30%	2850
	11th to 20th	Night	18% 13% 4 8% 5% 5% 4 3 5% 5% 30%	3531
	21st to end	Night	15% 14% 5% 10% 5% 4 4 3 4 5% 32%	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	56% 8% 12% 18% 5%	2208
	11th to 20th	Day	58% 6% 10% 19% 6% 1	2520
	21st to end	Day	51% 8% 10% 19% 11%	2772
February	1st to 10th	Day	53% 8% 10% 16% 11% 3	1558
	11th to 20th	Day	60% 5% 9% 14% 12% 1	1723
	21st to end	Day	51% 7% 9% 19% 12% 2	1570
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	46% 7% 16% 21% 10%	2070
October	1st to 10th	Day	46% 8% 15% 18% 12% 1	1926
	11th to 20th	Day	53% 9% 15% 17% 5%	1684
	21st to end	Day	59% 7% 11% 14% 9%	1782
November	1st to 10th	Day	55% 8% 14% 15% 7% 1	1671
	11th to 20th	Day	54% 8% 14% 17% 7%	1525
	21st to end	Day	60% 6% 12% 14% 7%	1353
December	1st to 10th	Day	58% 9% 12% 13% 7% 1	1330
	11th to 20th	Day	57% 6% 8% 18% 11%	1668
	21st to end	Day	52% 5% 14% 18% 6% 4	2431
January	1st to 10th	Night	59% 6% 11% 14% 10% 1	4744
	11th to 20th	Night	55% 6% 11% 20% 7%	4440
	21st to end	Night	45% 11% 13% 20% 10% 1	4884
February	1st to 10th	Night	53% 6% 10% 17% 13% 2	2621
	11th to 20th	Night	57% 7% 8% 17% 10% 1	2352
	21st to end	Night	53% 6% 10% 20% 10% 1	1884
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%	2078
October	1st to 10th	Night	43% 7% 14% 21% 13% 2	2034
	11th to 20th	Night	53% 7% 13% 21% 5%	2275
	21st to end	Night	52% 8% 14% 18% 8%	2574
November	1st to 10th	Night	52% 7% 13% 17% 10% 1	2407
	11th to 20th	Night	53% 7% 13% 18% 8% 1	2653
	21st to end	Night	58% 7% 12% 14% 9%	2826
December	1st to 10th	Night	57% 6% 12% 17% 7%	2850
	11th to 20th	Night	56% 6% 11% 17% 10%	3532
	21st to end	Night	55% 7% 12% 15% 10% 2	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	27% 13% 32% 19% 9% 1	180
	11th to 20th	Day	20% 18% 32% 22% 7% 1	180
	21st to end	Day	13% 15% 30% 26% 13% 3	198
February	1st to 10th	Day	12% 17% 34% 29% 6% 2	218
	11th to 20th	Day	17% 14% 37% 25% 7% 1	390
	21st to end	Day	18% 14% 38% 23% 5% 1	382
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	23% 8% 30% 27% 9% 4	483
October	1st to 10th	Day	18% 9% 35% 26% 9% 4	423
	11th to 20th	Day	27% 13% 26% 20% 11% 2	360
	21st to end	Day	31% 13% 29% 19% 7% 1	396
November	1st to 10th	Day	23% 16% 36% 20% 5% 1	365
	11th to 20th	Day	23% 14% 31% 21% 9% 1	370
	21st to end	Day	29% 17% 30% 18% 6%	203
December	1st to 10th	Day	24% 11% 30% 21% 12% 3	180
	11th to 20th	Day	24% 22% 31% 16% 6% 1	180
	21st to end	Day	24% 23% 23% 22% 7% 1	198
January	1st to 10th	Night	22% 11% 36% 26% 5%	848
	11th to 20th	Night	20% 14% 35% 25% 7%	760
	21st to end	Night	14% 9% 37% 32% 7% 1	836
February	1st to 10th	Night	14% 10% 40% 26% 7% 1	760
	11th to 20th	Night	19% 14% 33% 27% 6%	743
	21st to end	Night	20% 10% 32% 28% 9% 1	628
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	756
October	1st to 10th	Night	19% 8% 28% 31% 12% 2	720
	11th to 20th	Night	27% 8% 27% 24% 14% 1	720
	21st to end	Night	26% 9% 30% 26% 9%	792
November	1st to 10th	Night	23% 14% 31% 24% 8%	740
	11th to 20th	Night	24% 13% 32% 21% 8% 2	847
	21st to end	Night	24% 11% 35% 25% 5% 1	850
December	1st to 10th	Night	23% 11% 33% 24% 8% 1	850
	11th to 20th	Night	22% 14% 34% 23% 6% 1	850
	21st to end	Night	24% 13% 33% 22% 7% 1	935

Page generated at 2024-09-26 09:52:22. Version ac07

Copyright © 2024 Attilla Danko.