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 2024-12-06.

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	18% 10% 3 8% 5% 5% 5% 4 6% 7% 30%	102008
	Night	17% 10% 3 8% 5% 5% 5% 4 5% 6% 31%	97808
Transparency	Day	27% 49% 9% 10% 5%	105472
	Night	27% 49% 8% 10% 5%	102434
Seeing	Day	22% 16% 29% 23% 9% 2	16446
	Night	22% 13% 27% 28% 9% 1	24158

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% 12% 4 9% 6% 6% 5% 4 5% 7% 31%	2207
	11th to 20th	Day	12% 13% 4 9% 9% 10% 8% 5% 6% 6% 19%	2245
	21st to end	Day	7% 7% 4 9% 6% 6% 5% 4 7% 8% 39%	2835
February	1st to 10th	Day	9% 13% 4 10% 7% 6% 5% 5% 6% 6% 29%	1710
	11th to 20th	Day	11% 15% 5% 11% 6% 6% 6% 3 6% 6% 25%	1663
	21st to end	Day	9% 13% 4 8% 5% 7% 5% 5% 7% 7% 30%	1468
March	1st to 10th	Day	14% 12% 5% 9% 6% 6% 6% 4 5% 6% 27%	3271
	11th to 20th	Day	17% 18% 6% 10% 5% 4 5% 3 5% 5% 23%	3480
	21st to end	Day	21% 14% 4 8% 5% 4 4 4 5% 5% 27%	3816
April	1st to 10th	Day	21% 12% 3 8% 7% 5% 4 3 5% 6% 27%	2278
	11th to 20th	Day	18% 11% 4 8% 5% 5% 5% 4 5% 5% 32%	2442
	21st to end	Day	21% 11% 3 9% 5% 4 4 3 4 5% 30%	2470
May	1st to 10th	Day	18% 14% 4 11% 6% 5% 5% 3 4 6% 23%	4220
	11th to 20th	Day	20% 9% 3 7% 4 4 4 4 5% 6% 32%	4415
	21st to end	Day	24% 8% 2 7% 5% 5% 5% 4 6% 6% 28%	5185
June	1st to 10th	Day	25% 9% 3 7% 4 4 4 3 5% 6% 30%	2850
	11th to 20th	Day	19% 8% 2 6% 4 5% 5% 4 7% 7% 33%	2850
	21st to end	Day	24% 9% 2 8% 6% 5% 4 4 6% 6% 26%	2850
July	1st to 10th	Day	16% 7% 3 8% 6% 5% 6% 5% 7% 8% 30%	4760
	11th to 20th	Day	14% 6% 3 7% 5% 6% 6% 5% 8% 9% 33%	4760
	21st to end	Day	15% 5% 2 5% 4 4 4 4 7% 9% 40%	5012
August	1st to 10th	Day	17% 6% 3 6% 5% 5% 6% 5% 7% 7% 33%	4105
	11th to 20th	Day	17% 7% 3 7% 5% 6% 7% 4 7% 9% 29%	4045
	21st to end	Day	14% 5% 2 6% 4 5% 5% 4 7% 8% 40%	4532
September	1st to 10th	Day	19% 7% 3 7% 4 4 4 3 4 6% 39%	2309
	11th to 20th	Day	21% 6% 2 5% 4 3 3 3 3 5% 44%	2104
	21st to end	Day	20% 7% 3 7% 5% 5% 3 3 5% 6% 36%	2090
October	1st to 10th	Day	16% 8% 3 7% 5% 4 4 4 5% 6% 38%	1910
	11th to 20th	Day	21% 9% 3 9% 5% 5% 4 3 6% 7% 28%	1900
	21st to end	Day	26% 10% 3 8% 5% 5% 4 3 5% 6% 26%	1929
November	1st to 10th	Day	19% 11% 4 7% 7% 5% 5% 4 6% 6% 27%	1598
	11th to 20th	Day	21% 11% 3 8% 6% 6% 6% 4 6% 6% 24%	1600
	21st to end	Day	21% 14% 5% 10% 5% 4 5% 4 5% 6% 22%	1600
December	1st to 10th	Day	19% 13% 4 9% 5% 5% 6% 4 6% 6% 23%	1400
	11th to 20th	Day	18% 12% 4 10% 7% 6% 5% 4 5% 6% 22%	1668
	21st to end	Day	14% 16% 4 9% 5% 5% 4 3 4 5% 31%	2431
January	1st to 10th	Night	9% 10% 4 11% 7% 7% 8% 6% 8% 8% 21%	4748
	11th to 20th	Night	15% 12% 4 10% 8% 6% 6% 4 5% 7% 23%	4720
	21st to end	Night	6% 9% 4 10% 6% 4 4 4 5% 7% 38%	4820
February	1st to 10th	Night	8% 14% 5% 9% 6% 6% 5% 5% 5% 7% 31%	2470
	11th to 20th	Night	12% 15% 5% 10% 6% 5% 5% 5% 6% 6% 24%	2403
	21st to end	Night	12% 14% 5% 7% 5% 6% 4 5% 6% 7% 31%	1984
March	1st to 10th	Night	12% 13% 5% 9% 6% 4 7% 4 4 6% 30%	3568
	11th to 20th	Night	20% 18% 5% 10% 6% 5% 4 3 5% 3 20%	3479
	21st to end	Night	26% 13% 3 8% 5% 5% 4 2 4 5% 24%	3816
April	1st to 10th	Night	23% 14% 3 7% 4 4 5% 3 4 4 29%	1897
	11th to 20th	Night	20% 9% 4 7% 5% 4 3 3 5% 7% 34%	1688
	21st to end	Night	25% 9% 3 7% 4 3 3 3 4 4 34%	1710
May	1st to 10th	Night	17% 12% 3 9% 5% 5% 4 4 5% 6% 31%	2724
	11th to 20th	Night	18% 8% 2 6% 4 5% 5% 4 5% 8% 34%	2506
	21st to end	Night	19% 11% 3 7% 5% 5% 5% 3 6% 7% 30%	2414
June	1st to 10th	Night	26% 8% 2 7% 3 4 4 2 6% 6% 33%	1330
	11th to 20th	Night	21% 6% 2 6% 4 4 4 3 5% 7% 38%	1330
	21st to end	Night	29% 7% 1 5% 4 5% 5% 3 5% 5% 31%	1330
July	1st to 10th	Night	15% 7% 2 7% 5% 5% 4 4 6% 8% 38%	2210
	11th to 20th	Night	17% 7% 3 6% 4 5% 6% 4 6% 8% 34%	2210
	21st to end	Night	13% 6% 2 7% 4 3 4 4 5% 7% 44%	2513
August	1st to 10th	Night	17% 8% 3 8% 5% 4 5% 4 5% 7% 34%	2825
	11th to 20th	Night	19% 8% 3 6% 5% 5% 5% 4 6% 8% 33%	2782
	21st to end	Night	15% 5% 2 5% 3 4 4 3 5% 6% 49%	3124
September	1st to 10th	Night	20% 5% 1 4 3 3 4 4 6% 7% 43%	1870
	11th to 20th	Night	20% 5% 1 5% 3 3 4 3 4 6% 46%	2074
	21st to end	Night	19% 6% 2 5% 3 3 3 3 4 6% 47%	2090
October	1st to 10th	Night	20% 7% 2 6% 3 3 4 3 4 5% 40%	2269
	11th to 20th	Night	22% 8% 2 5% 5% 5% 5% 3 4 7% 35%	2280
	21st to end	Night	23% 9% 2 6% 4 4 6% 4 6% 8% 30%	2665
November	1st to 10th	Night	21% 9% 3 6% 4 5% 5% 4 6% 6% 32%	2700
	11th to 20th	Night	21% 11% 3 7% 5% 5% 5% 5% 6% 6% 27%	2800
	21st to end	Night	20% 13% 3 8% 5% 5% 5% 4 6% 6% 23%	2800
December	1st to 10th	Night	21% 13% 4 9% 5% 4 3 4 5% 5% 26%	2892
	11th to 20th	Night	23% 11% 4 8% 6% 5% 5% 4 6% 6% 23%	3531
	21st to end	Night	15% 15% 4 9% 5% 5% 5% 4 5% 6% 28%	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	29% 41% 10% 13% 6%	2208
	11th to 20th	Day	33% 48% 8% 8% 2	2245
	21st to end	Day	21% 47% 9% 13% 10%	2835
February	1st to 10th	Day	17% 65% 4 9% 3 1	1710
	11th to 20th	Day	18% 65% 4 8% 4	1671
	21st to end	Day	17% 65% 4 9% 4 1	1468
March	1st to 10th	Day	29% 47% 9% 9% 6% 1	3275
	11th to 20th	Day	40% 43% 6% 8% 2 1	3480
	21st to end	Day	35% 44% 5% 10% 5% 1	3816
April	1st to 10th	Day	19% 65% 4 7% 5% 1	2278
	11th to 20th	Day	18% 66% 4 7% 3 1	2442
	21st to end	Day	22% 65% 3 5% 4 1	2470
May	1st to 10th	Day	32% 50% 7% 8% 3	4234
	11th to 20th	Day	29% 45% 12% 10% 4	4419
	21st to end	Day	31% 46% 8% 9% 5%	5185
June	1st to 10th	Day	19% 66% 5% 7% 4	2850
	11th to 20th	Day	19% 66% 5% 6% 3 1	2850
	21st to end	Day	20% 65% 5% 7% 3	2850
July	1st to 10th	Day	30% 39% 9% 14% 8%	4685
	11th to 20th	Day	28% 39% 15% 15% 3	4679
	21st to end	Day	21% 38% 17% 17% 7%	4851
August	1st to 10th	Day	29% 39% 15% 12% 5%	4092
	11th to 20th	Day	33% 41% 14% 9% 3	4084
	21st to end	Day	22% 40% 14% 14% 10%	4532
September	1st to 10th	Day	18% 61% 7% 10% 4	2309
	11th to 20th	Day	20% 60% 8% 9% 3	2104
	21st to end	Day	18% 60% 5% 11% 5%	2090
October	1st to 10th	Day	32% 39% 8% 17% 4	3170
	11th to 20th	Day	33% 40% 9% 13% 4	3140
	21st to end	Day	29% 40% 12% 12% 7%	3153
November	1st to 10th	Day	27% 58% 7% 6% 2	1598
	11th to 20th	Day	26% 60% 5% 7% 2	1600
	21st to end	Day	27% 60% 7% 5% 1	1600
December	1st to 10th	Day	23% 60% 7% 8% 2	1400
	11th to 20th	Day	34% 52% 6% 6% 3	1668
	21st to end	Day	30% 42% 11% 8% 8% 2	2431
January	1st to 10th	Night	31% 46% 12% 9% 2	4748
	11th to 20th	Night	36% 45% 9% 8% 2	4720
	21st to end	Night	25% 44% 8% 12% 10% 1	4820
February	1st to 10th	Night	17% 65% 3 9% 5% 1	2470
	11th to 20th	Night	19% 65% 4 8% 4 1	2406
	21st to end	Night	16% 65% 4 8% 5% 1	1984
March	1st to 10th	Night	30% 44% 9% 12% 6%	3577
	11th to 20th	Night	45% 42% 4 5% 3 1	3480
	21st to end	Night	38% 43% 6% 6% 6% 1	3816
April	1st to 10th	Night	20% 65% 3 5% 6% 2	1897
	11th to 20th	Night	19% 65% 2 7% 6%	1688
	21st to end	Night	23% 65% 2 6% 4 1	1710
May	1st to 10th	Night	32% 45% 8% 8% 6%	2730
	11th to 20th	Night	26% 45% 12% 13% 3	2507
	21st to end	Night	31% 47% 8% 10% 4	2415
June	1st to 10th	Night	19% 64% 4 9% 3	1330
	11th to 20th	Night	16% 65% 5% 8% 5% 1	1330
	21st to end	Night	17% 64% 5% 9% 4	1330
July	1st to 10th	Night	27% 39% 12% 12% 10%	2175
	11th to 20th	Night	30% 38% 12% 18% 2	2168
	21st to end	Night	23% 41% 15% 14% 8%	2434
August	1st to 10th	Night	33% 39% 10% 14% 3	2813
	11th to 20th	Night	32% 41% 13% 10% 3	2809
	21st to end	Night	22% 40% 12% 14% 13%	3124
September	1st to 10th	Night	16% 62% 7% 11% 5%	1870
	11th to 20th	Night	19% 61% 7% 9% 4	2074
	21st to end	Night	15% 60% 4 14% 6% 1	2090
October	1st to 10th	Night	34% 38% 7% 17% 4	3789
	11th to 20th	Night	27% 40% 8% 20% 6%	3779
	21st to end	Night	27% 41% 11% 14% 7%	4391
November	1st to 10th	Night	25% 58% 6% 8% 3	2700
	11th to 20th	Night	25% 59% 7% 6% 3	2800
	21st to end	Night	27% 60% 6% 6% 2	2800
December	1st to 10th	Night	23% 60% 6% 8% 3	2892
	11th to 20th	Night	31% 52% 6% 8% 3	3532
	21st to end	Night	32% 41% 11% 10% 4 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	23% 24% 27% 19% 6% 1	180
	11th to 20th	Day	28% 22% 26% 17% 6% 1	180
	21st to end	Day	12% 18% 36% 23% 11% 1	235
February	1st to 10th	Day	17% 18% 32% 23% 8% 2	370
	11th to 20th	Day	17% 26% 32% 19% 6% 1	366
	21st to end	Day	17% 19% 34% 22% 7% 1	334
March	1st to 10th	Day	21% 18% 35% 20% 5% 1	460
	11th to 20th	Day	22% 17% 29% 22% 9% 1	460
	21st to end	Day	22% 20% 32% 18% 6% 2	506
April	1st to 10th	Day	27% 23% 30% 16% 3 1	460
	11th to 20th	Day	21% 20% 31% 20% 6% 1	452
	21st to end	Day	25% 20% 27% 20% 5% 2	460
May	1st to 10th	Day	25% 14% 32% 19% 8% 1	525
	11th to 20th	Day	23% 14% 27% 22% 12% 3	674
	21st to end	Day	23% 17% 31% 21% 7% 1	735
June	1st to 10th	Day	27% 13% 29% 21% 8% 1	680
	11th to 20th	Day	22% 15% 26% 24% 12% 2	680
	21st to end	Day	26% 10% 30% 24% 9% 2	680
July	1st to 10th	Day	20% 10% 32% 26% 10% 1	670
	11th to 20th	Day	15% 10% 29% 32% 12% 1	668
	21st to end	Day	20% 6% 26% 32% 13% 2	685
August	1st to 10th	Day	19% 9% 30% 27% 13% 2	486
	11th to 20th	Day	17% 10% 30% 28% 13% 2	479
	21st to end	Day	16% 10% 28% 28% 12% 4	539
September	1st to 10th	Day	20% 11% 32% 25% 10% 2	490
	11th to 20th	Day	22% 13% 29% 24% 10% 3	490
	21st to end	Day	22% 17% 26% 22% 11% 3	490
October	1st to 10th	Day	19% 14% 30% 24% 12% 2	395
	11th to 20th	Day	24% 18% 24% 21% 12% 1	390
	21st to end	Day	32% 21% 21% 17% 8% 1	429
November	1st to 10th	Day	25% 19% 28% 20% 6% 1	395
	11th to 20th	Day	29% 20% 25% 19% 6% 1	400
	21st to end	Day	29% 21% 27% 19% 4 1	400
December	1st to 10th	Day	27% 13% 32% 19% 8% 1	225
	11th to 20th	Day	25% 24% 32% 15% 3 1	180
	21st to end	Day	20% 28% 30% 20% 3	198
January	1st to 10th	Night	18% 17% 34% 25% 6% 1	850
	11th to 20th	Night	23% 16% 30% 27% 5%	837
	21st to end	Night	14% 19% 32% 28% 7%	836
February	1st to 10th	Night	14% 19% 32% 27% 7% 1	760
	11th to 20th	Night	21% 17% 33% 24% 5%	743
	21st to end	Night	17% 15% 35% 26% 7%	628
March	1st to 10th	Night	18% 16% 31% 29% 6%	760
	11th to 20th	Night	22% 16% 28% 24% 9% 1	760
	21st to end	Night	20% 14% 29% 27% 8% 1	836
April	1st to 10th	Night	29% 13% 29% 24% 5%	637
	11th to 20th	Night	22% 13% 29% 27% 8% 1	564
	21st to end	Night	31% 9% 24% 28% 8% 1	570
May	1st to 10th	Night	26% 10% 24% 30% 10%	570
	11th to 20th	Night	22% 9% 26% 30% 12% 1	562
	21st to end	Night	22% 8% 30% 31% 8%	424
June	1st to 10th	Night	27% 4 22% 36% 11%	380
	11th to 20th	Night	21% 5% 20% 36% 18%	380
	21st to end	Night	30% 4 19% 34% 12% 1	380
July	1st to 10th	Night	19% 4 23% 40% 14% 1	370
	11th to 20th	Night	17% 5% 20% 42% 16% 1	368
	21st to end	Night	22% 3 15% 40% 18% 1	430
August	1st to 10th	Night	16% 3 20% 41% 19% 1	568
	11th to 20th	Night	22% 4 16% 39% 19% 1	562
	21st to end	Night	17% 5% 21% 35% 21% 2	627
September	1st to 10th	Night	20% 7% 27% 33% 12% 1	570
	11th to 20th	Night	21% 9% 19% 34% 15% 1	744
	21st to end	Night	20% 9% 24% 34% 13%	760
October	1st to 10th	Night	24% 9% 27% 29% 10% 1	760
	11th to 20th	Night	24% 11% 28% 24% 12% 1	760
	21st to end	Night	27% 15% 26% 25% 7%	836
November	1st to 10th	Night	27% 17% 26% 24% 6% 1	863
	11th to 20th	Night	25% 18% 28% 21% 7% 1	900
	21st to end	Night	27% 18% 28% 20% 7%	900
December	1st to 10th	Night	25% 15% 29% 23% 8%	878
	11th to 20th	Night	26% 22% 30% 17% 5%	850
	21st to end	Night	24% 19% 28% 23% 4 2	935

Page generated at 2024-12-03 06:45:09. Version ac07

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