Carleton-sur-mer
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Carleton-sur-mer clear sky chart from 2005-11-06 to 2026-03-18.

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	17% 10% 4 8% 5% 5% 5% 4 6% 7% 30%	131070
	Night	16% 11% 4 9% 5% 5% 5% 4 5% 6% 31%	130585
Transparency	Day	32% 40% 10% 12% 6%	134509
	Night	34% 39% 9% 12% 6%	135234
Seeing	Day	23% 16% 29% 22% 9% 2	18053
	Night	22% 13% 27% 28% 9% 1	25914

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	12% 17% 5% 10% 5% 5% 4 4 6% 7% 25%	4093
	11th to 20th	Day	11% 15% 6% 14% 9% 7% 6% 4 5% 6% 17%	4158
	21st to end	Day	4 5% 4 11% 6% 6% 6% 5% 9% 9% 36%	5243
February	1st to 10th	Day	8% 12% 4 10% 8% 6% 6% 5% 6% 6% 29%	1890
	11th to 20th	Day	10% 15% 6% 11% 5% 6% 6% 3 6% 6% 26%	1843
	21st to end	Day	9% 12% 4 9% 6% 7% 5% 5% 6% 7% 30%	1618
March	1st to 10th	Day	18% 12% 5% 9% 5% 5% 5% 3 5% 6% 27%	4806
	11th to 20th	Day	15% 17% 6% 10% 5% 5% 4 3 5% 6% 23%	5057
	21st to end	Day	20% 16% 5% 9% 4 4 4 4 5% 5% 25%	5466
April	1st to 10th	Day	21% 12% 3 9% 7% 5% 4 3 5% 6% 27%	2399
	11th to 20th	Day	18% 11% 4 8% 5% 5% 5% 4 5% 5% 31%	2572
	21st to end	Day	22% 11% 3 9% 5% 4 4 3 5% 5% 29%	2600
May	1st to 10th	Day	22% 13% 4 9% 6% 5% 5% 3 4 5% 25%	6042
	11th to 20th	Day	23% 9% 3 7% 5% 4 4 3 5% 6% 30%	6335
	21st to end	Day	24% 9% 2 6% 4 4 4 4 5% 6% 32%	7451
June	1st to 10th	Day	25% 9% 3 7% 4 4 4 3 5% 6% 31%	3000
	11th to 20th	Day	19% 8% 2 6% 4 5% 5% 4 7% 7% 32%	3000
	21st to end	Day	24% 9% 2 8% 6% 5% 4 4 6% 6% 26%	3000
July	1st to 10th	Day	14% 6% 3 7% 5% 5% 6% 5% 8% 9% 31%	6820
	11th to 20th	Day	14% 6% 2 7% 5% 5% 6% 5% 8% 9% 33%	6820
	21st to end	Day	13% 5% 2 6% 4 4 4 4 6% 8% 43%	7208
August	1st to 10th	Day	17% 5% 3 6% 4 5% 6% 5% 7% 7% 34%	4235
	11th to 20th	Day	17% 7% 3 7% 5% 5% 7% 4 7% 9% 30%	4175
	21st to end	Day	14% 5% 2 6% 4 5% 5% 4 7% 8% 40%	4675
September	1st to 10th	Day	18% 7% 3 7% 4 4 4 3 4 6% 40%	2430
	11th to 20th	Day	20% 6% 2 5% 4 4 4 3 3 5% 45%	2214
	21st to end	Day	19% 7% 3 7% 5% 5% 4 4 5% 6% 37%	2200
October	1st to 10th	Day	16% 8% 4 7% 5% 4 4 4 5% 6% 38%	2010
	11th to 20th	Day	21% 9% 4 9% 5% 5% 5% 3 6% 7% 28%	2000
	21st to end	Day	26% 10% 3 8% 5% 5% 4 3 5% 6% 26%	2030
November	1st to 10th	Day	19% 11% 4 7% 7% 5% 5% 4 6% 6% 26%	1679
	11th to 20th	Day	21% 11% 3 8% 6% 6% 5% 4 6% 6% 24%	1680
	21st to end	Day	20% 14% 4 11% 5% 5% 5% 4 5% 6% 21%	1680
December	1st to 10th	Day	13% 14% 4 10% 6% 6% 6% 5% 6% 6% 26%	2400
	11th to 20th	Day	19% 11% 5% 11% 6% 5% 5% 3 5% 6% 25%	2688
	21st to end	Day	12% 15% 6% 10% 5% 4 4 3 4 5% 32%	3553
January	1st to 10th	Night	11% 15% 5% 12% 6% 6% 6% 5% 6% 7% 20%	8831
	11th to 20th	Night	12% 14% 5% 12% 8% 5% 5% 4 5% 7% 23%	8735
	21st to end	Night	4 8% 4 11% 6% 5% 6% 7% 7% 9% 34%	8937
February	1st to 10th	Night	8% 13% 4 9% 6% 6% 5% 5% 5% 7% 31%	2730
	11th to 20th	Night	12% 15% 5% 10% 6% 5% 5% 5% 6% 7% 25%	2663
	21st to end	Night	11% 13% 5% 7% 5% 5% 4 4 6% 6% 33%	2186
March	1st to 10th	Night	18% 13% 5% 9% 6% 4 5% 3 3 5% 29%	5253
	11th to 20th	Night	19% 15% 5% 11% 7% 5% 5% 4 5% 4 21%	5057
	21st to end	Night	25% 15% 4 8% 5% 5% 3 2 4 5% 25%	5466
April	1st to 10th	Night	23% 14% 3 7% 4 4 5% 3 4 4 29%	1996
	11th to 20th	Night	21% 9% 4 7% 5% 4 3 3 5% 7% 33%	1778
	21st to end	Night	25% 10% 3 8% 5% 3 4 3 4 4 33%	1800
May	1st to 10th	Night	19% 11% 3 9% 5% 4 4 3 4 5% 32%	3892
	11th to 20th	Night	24% 9% 3 6% 4 4 4 3 4 6% 33%	3596
	21st to end	Night	18% 11% 3 7% 5% 4 4 2 6% 7% 34%	3459
June	1st to 10th	Night	26% 8% 2 7% 3 4 4 2 5% 6% 33%	1400
	11th to 20th	Night	21% 6% 2 6% 5% 4 4 3 5% 7% 38%	1400
	21st to end	Night	28% 7% 2 5% 4 5% 5% 3 5% 5% 31%	1400
July	1st to 10th	Night	15% 8% 2 8% 6% 5% 5% 4 7% 8% 31%	3160
	11th to 20th	Night	16% 6% 2 6% 5% 5% 6% 5% 7% 9% 33%	3160
	21st to end	Night	11% 6% 3 7% 5% 4 4 4 5% 7% 44%	3610
August	1st to 10th	Night	16% 8% 3 8% 5% 4 5% 4 5% 7% 35%	2915
	11th to 20th	Night	18% 7% 3 6% 5% 5% 5% 4 6% 8% 34%	2872
	21st to end	Night	15% 5% 2 5% 3 4 4 3 5% 6% 48%	3223
September	1st to 10th	Night	19% 5% 1 4 3 3 4 4 6% 7% 44%	1969
	11th to 20th	Night	19% 5% 1 5% 3 3 4 3 4 6% 46%	2183
	21st to end	Night	18% 6% 2 5% 3 3 3 2 4 6% 48%	2200
October	1st to 10th	Night	20% 7% 2 6% 3 3 4 3 4 6% 41%	2389
	11th to 20th	Night	21% 8% 3 5% 5% 5% 4 3 4 7% 35%	2400
	21st to end	Night	23% 9% 2 6% 4 4 6% 4 6% 7% 30%	2806
November	1st to 10th	Night	21% 9% 3 6% 5% 5% 5% 4 6% 6% 31%	2839
	11th to 20th	Night	21% 11% 3 8% 5% 5% 5% 5% 6% 6% 26%	2940
	21st to end	Night	20% 13% 3 8% 5% 6% 5% 4 6% 6% 23%	2940
December	1st to 10th	Night	13% 12% 5% 10% 6% 5% 4 4 6% 7% 29%	4992
	11th to 20th	Night	21% 12% 4 10% 6% 4 5% 4 5% 6% 24%	5741
	21st to end	Night	15% 14% 4 10% 5% 5% 4 3 4 6% 29%	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	45% 25% 12% 13% 5%	4094
	11th to 20th	Day	50% 29% 11% 8% 2	4184
	21st to end	Day	29% 28% 11% 16% 15%	5243
February	1st to 10th	Day	20% 59% 5% 10% 3 2	1890
	11th to 20th	Day	21% 59% 5% 9% 5%	1851
	21st to end	Day	20% 59% 4 10% 5% 1	1618
March	1st to 10th	Day	39% 32% 8% 9% 10% 1	4810
	11th to 20th	Day	46% 31% 8% 9% 5% 2	5057
	21st to end	Day	43% 32% 5% 11% 8% 1	5466
April	1st to 10th	Day	21% 62% 4 7% 6% 1	2399
	11th to 20th	Day	21% 63% 4 8% 3 1	2572
	21st to end	Day	24% 62% 4 6% 4 1	2600
May	1st to 10th	Day	42% 36% 7% 10% 6%	6053
	11th to 20th	Day	39% 33% 13% 11% 4	6339
	21st to end	Day	36% 34% 9% 15% 6%	7451
June	1st to 10th	Day	20% 62% 6% 8% 4	3000
	11th to 20th	Day	21% 63% 6% 7% 4 1	3000
	21st to end	Day	22% 62% 5% 7% 4	3000
July	1st to 10th	Day	34% 29% 12% 17% 9%	6745
	11th to 20th	Day	33% 29% 19% 16% 3	6739
	21st to end	Day	26% 28% 17% 23% 7%	6999
August	1st to 10th	Day	28% 38% 15% 13% 6%	4222
	11th to 20th	Day	33% 40% 14% 10% 3	4214
	21st to end	Day	23% 39% 14% 14% 10%	4675
September	1st to 10th	Day	18% 58% 9% 11% 4	2430
	11th to 20th	Day	21% 57% 8% 10% 3	2214
	21st to end	Day	18% 58% 6% 13% 5%	2200
October	1st to 10th	Day	32% 38% 9% 17% 4	3270
	11th to 20th	Day	34% 39% 9% 13% 5%	3240
	21st to end	Day	30% 39% 12% 12% 7%	3254
November	1st to 10th	Day	29% 55% 8% 6% 2	1679
	11th to 20th	Day	27% 58% 5% 7% 2	1680
	21st to end	Day	29% 57% 7% 5% 1	1680
December	1st to 10th	Day	34% 38% 10% 15% 2	2400
	11th to 20th	Day	43% 33% 7% 11% 6%	2688
	21st to end	Day	37% 30% 10% 12% 10% 1	3553
January	1st to 10th	Night	47% 28% 12% 11% 2	8831
	11th to 20th	Night	47% 27% 11% 10% 4	8784
	21st to end	Night	31% 27% 13% 15% 13% 1	8937
February	1st to 10th	Night	19% 60% 5% 10% 5% 1	2730
	11th to 20th	Night	22% 59% 4 10% 4 1	2666
	21st to end	Night	18% 60% 4 10% 7% 1	2186
March	1st to 10th	Night	41% 31% 8% 9% 11%	5262
	11th to 20th	Night	50% 31% 7% 6% 6% 1	5058
	21st to end	Night	46% 31% 6% 8% 9% 1	5466
April	1st to 10th	Night	22% 61% 3 5% 7% 2	1996
	11th to 20th	Night	22% 62% 2 7% 7%	1778
	21st to end	Night	25% 62% 2 6% 4 1	1800
May	1st to 10th	Night	39% 33% 7% 11% 9% 2	3898
	11th to 20th	Night	38% 32% 9% 13% 7% 1	3597
	21st to end	Night	34% 35% 9% 15% 7%	3460
June	1st to 10th	Night	20% 61% 5% 10% 4	1400
	11th to 20th	Night	17% 62% 5% 9% 6% 1	1400
	21st to end	Night	19% 61% 5% 9% 5% 1	1400
July	1st to 10th	Night	36% 30% 12% 15% 7%	3125
	11th to 20th	Night	33% 29% 15% 20% 2	3118
	21st to end	Night	27% 29% 15% 18% 10%	3505
August	1st to 10th	Night	33% 38% 10% 15% 4	2903
	11th to 20th	Night	32% 40% 13% 11% 4	2899
	21st to end	Night	23% 39% 12% 14% 12%	3223
September	1st to 10th	Night	16% 59% 8% 12% 5%	1969
	11th to 20th	Night	20% 58% 8% 10% 4	2183
	21st to end	Night	15% 57% 5% 15% 8% 1	2200
October	1st to 10th	Night	34% 37% 7% 18% 4	3909
	11th to 20th	Night	27% 39% 8% 20% 6%	3899
	21st to end	Night	28% 40% 11% 14% 7%	4532
November	1st to 10th	Night	27% 55% 7% 8% 3	2839
	11th to 20th	Night	27% 57% 7% 6% 2	2940
	21st to end	Night	29% 57% 6% 6% 2	2940
December	1st to 10th	Night	31% 38% 11% 18% 3	4992
	11th to 20th	Night	40% 35% 8% 13% 4	5742
	21st to end	Night	40% 29% 10% 14% 6% 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	25% 24% 28% 16% 6%	220
	11th to 20th	Day	29% 20% 26% 15% 10% 1	220
	21st to end	Day	14% 19% 36% 21% 9% 1	283
February	1st to 10th	Day	17% 18% 33% 21% 9% 2	430
	11th to 20th	Day	18% 26% 31% 18% 6% 1	426
	21st to end	Day	17% 20% 34% 22% 6% 1	388
March	1st to 10th	Day	24% 19% 34% 18% 5% 1	540
	11th to 20th	Day	25% 17% 29% 20% 8% 1	528
	21st to end	Day	23% 19% 32% 17% 6% 2	550
April	1st to 10th	Day	29% 24% 28% 15% 3 1	500
	11th to 20th	Day	23% 20% 31% 20% 6% 1	492
	21st to end	Day	29% 20% 25% 19% 5% 2	500
May	1st to 10th	Day	27% 14% 31% 18% 8% 1	568
	11th to 20th	Day	24% 15% 27% 21% 11% 2	724
	21st to end	Day	24% 16% 31% 21% 7% 1	790
June	1st to 10th	Day	26% 13% 30% 22% 8% 1	730
	11th to 20th	Day	22% 16% 26% 23% 11% 2	730
	21st to end	Day	27% 11% 30% 23% 8% 2	730
July	1st to 10th	Day	20% 11% 32% 26% 10% 1	720
	11th to 20th	Day	15% 11% 30% 32% 12% 1	718
	21st to end	Day	20% 8% 27% 31% 12% 2	737
August	1st to 10th	Day	17% 9% 31% 28% 13% 2	526
	11th to 20th	Day	17% 10% 30% 29% 13% 2	519
	21st to end	Day	16% 12% 28% 28% 12% 4	583
September	1st to 10th	Day	20% 11% 31% 25% 11% 2	530
	11th to 20th	Day	21% 14% 28% 24% 10% 3	530
	21st to end	Day	22% 17% 27% 21% 11% 3	530
October	1st to 10th	Day	18% 14% 31% 24% 11% 2	425
	11th to 20th	Day	23% 18% 24% 21% 12% 2	420
	21st to end	Day	32% 21% 22% 16% 8% 1	462
November	1st to 10th	Day	27% 19% 28% 19% 6% 1	425
	11th to 20th	Day	28% 20% 25% 19% 7% 1	430
	21st to end	Day	28% 22% 26% 19% 4 1	430
December	1st to 10th	Day	27% 15% 32% 18% 7% 1	257
	11th to 20th	Day	29% 22% 32% 13% 3 1	220
	21st to end	Day	20% 25% 31% 19% 5%	242
January	1st to 10th	Night	19% 17% 34% 24% 6% 1	950
	11th to 20th	Night	23% 16% 29% 26% 5%	933
	21st to end	Night	15% 20% 32% 27% 6%	924
February	1st to 10th	Night	13% 19% 34% 26% 8% 1	840
	11th to 20th	Night	22% 16% 33% 24% 5%	823
	21st to end	Night	17% 14% 35% 26% 7%	692
March	1st to 10th	Night	21% 16% 31% 27% 5%	840
	11th to 20th	Night	22% 16% 29% 24% 8% 1	829
	21st to end	Night	21% 15% 29% 27% 8% 1	880
April	1st to 10th	Night	30% 13% 29% 23% 5%	670
	11th to 20th	Night	22% 13% 30% 26% 8% 1	594
	21st to end	Night	31% 9% 24% 27% 8% 1	600
May	1st to 10th	Night	27% 10% 24% 29% 10%	600
	11th to 20th	Night	23% 9% 26% 29% 11% 1	592
	21st to end	Night	22% 8% 30% 32% 8%	446
June	1st to 10th	Night	27% 5% 22% 37% 10%	400
	11th to 20th	Night	22% 6% 20% 35% 17%	400
	21st to end	Night	30% 5% 20% 34% 11% 1	400
July	1st to 10th	Night	19% 4 23% 40% 13% 1	390
	11th to 20th	Night	17% 5% 20% 42% 16% 1	388
	21st to end	Night	21% 4 17% 40% 17% 1	453
August	1st to 10th	Night	15% 3 20% 42% 19% 1	598
	11th to 20th	Night	21% 4 17% 39% 19% 1	592
	21st to end	Night	16% 5% 21% 35% 20% 2	660
September	1st to 10th	Night	20% 7% 26% 34% 13% 1	600
	11th to 20th	Night	21% 9% 19% 35% 15% 1	783
	21st to end	Night	20% 10% 24% 33% 13%	800
October	1st to 10th	Night	23% 10% 28% 28% 10% 1	800
	11th to 20th	Night	23% 11% 29% 25% 12% 1	800
	21st to end	Night	28% 14% 25% 25% 8%	880
November	1st to 10th	Night	27% 17% 26% 24% 5% 1	912
	11th to 20th	Night	25% 19% 29% 20% 6% 1	950
	21st to end	Night	27% 18% 28% 20% 7%	950
December	1st to 10th	Night	24% 16% 29% 23% 7%	950
	11th to 20th	Night	27% 21% 30% 17% 5%	950
	21st to end	Night	24% 18% 28% 24% 4 2	1045

Page generated at 2026-03-15 02:23:54. Version ac07

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