North East Margaree
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the North East Margaree clear sky chart from 2005-11-06 to 2026-04-02.

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	20% 15% 6% 12% 6% 5% 4 3 4 5% 21%	131697
	Night	18% 16% 6% 15% 7% 5% 4 3 4 4 19%	130393
Transparency	Day	64% 6% 10% 14% 5%	135170
	Night	68% 7% 9% 12% 5%	135017
Seeing	Day	32% 24% 27% 13% 4 1	19533
	Night	31% 21% 25% 18% 5%	27084

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% 24% 11% 24% 10% 4 3 2 2 3 6%	4690
	11th to 20th	Day	17% 19% 13% 22% 9% 3 3 2 2 2 6%	4681
	21st to end	Day	10% 12% 6% 22% 16% 14% 3 2 3 3 9%	5306
February	1st to 10th	Day	18% 15% 8% 20% 12% 6% 4 2 3 3 9%	1890
	11th to 20th	Day	14% 21% 8% 18% 12% 7% 5% 3 3 2 9%	1843
	21st to end	Day	10% 18% 7% 13% 9% 7% 3 3 4 5% 20%	1706
March	1st to 10th	Day	18% 15% 6% 14% 10% 6% 2 2 2 4 21%	4574
	11th to 20th	Day	12% 19% 8% 15% 6% 5% 4 3 4 5% 19%	5090
	21st to end	Day	19% 20% 8% 18% 5% 4 3 3 4 4 11%	5885
April	1st to 10th	Day	19% 19% 7% 12% 5% 3 4 3 4 4 19%	2412
	11th to 20th	Day	20% 18% 6% 7% 4 3 3 2 4 5% 28%	2374
	21st to end	Day	20% 17% 5% 8% 5% 4 4 3 4 5% 26%	2599
May	1st to 10th	Day	23% 19% 6% 9% 4 4 4 3 4 4 20%	6345
	11th to 20th	Day	19% 11% 3 7% 4 5% 5% 4 5% 7% 30%	6318
	21st to end	Day	20% 11% 3 7% 5% 5% 4 4 6% 7% 28%	6948
June	1st to 10th	Day	27% 15% 3 7% 4 4 3 3 6% 7% 22%	2800
	11th to 20th	Day	20% 9% 3 6% 4 4 4 4 5% 8% 33%	2800
	21st to end	Day	28% 10% 3 8% 5% 5% 4 4 4 5% 24%	2800
July	1st to 10th	Day	27% 9% 3 7% 5% 4 4 4 6% 7% 24%	6360
	11th to 20th	Day	23% 7% 2 6% 4 4 4 3 5% 6% 35%	6360
	21st to end	Day	18% 8% 3 6% 5% 5% 5% 4 7% 8% 31%	6927
August	1st to 10th	Day	26% 8% 2 7% 5% 5% 5% 4 6% 7% 24%	4538
	11th to 20th	Day	19% 9% 3 9% 4 5% 5% 4 6% 8% 27%	4175
	21st to end	Day	17% 7% 2 7% 5% 4 5% 4 6% 7% 35%	4314
September	1st to 10th	Day	21% 8% 3 6% 4 4 3 4 5% 7% 35%	2400
	11th to 20th	Day	26% 9% 3 7% 4 4 4 4 5% 6% 29%	2400
	21st to end	Day	23% 9% 3 5% 4 4 4 4 5% 6% 32%	2128
October	1st to 10th	Day	26% 11% 3 8% 3 4 4 3 5% 8% 27%	2000
	11th to 20th	Day	26% 16% 3 8% 4 4 4 4 4 6% 22%	2000
	21st to end	Day	26% 22% 4 7% 5% 4 4 3 4 5% 17%	2030
November	1st to 10th	Day	27% 26% 4 8% 4 3 3 3 4 4 14%	1808
	11th to 20th	Day	22% 32% 8% 9% 4 4 3 1 3 4 11%	1680
	21st to end	Day	15% 30% 13% 13% 4 5% 2 2 4 4 8%	1680
December	1st to 10th	Day	15% 25% 15% 20% 6% 3 3 2 3 2 6%	2690
	11th to 20th	Day	25% 20% 9% 23% 4 3 3 2 2 2 8%	3076
	21st to end	Day	16% 20% 10% 24% 6% 5% 3 2 3 3 9%	4070
January	1st to 10th	Night	11% 24% 10% 28% 9% 4 2 2 2 2 6%	8234
	11th to 20th	Night	17% 18% 9% 31% 8% 4 3 1 2 2 5%	8234
	21st to end	Night	8% 14% 7% 25% 19% 10% 3 2 2 2 8%	8897
February	1st to 10th	Night	16% 16% 6% 18% 13% 7% 5% 2 3 3 10%	2730
	11th to 20th	Night	15% 20% 6% 18% 12% 6% 4 2 3 3 11%	2663
	21st to end	Night	10% 18% 7% 15% 10% 6% 5% 3 4 5% 17%	2099
March	1st to 10th	Night	18% 17% 6% 16% 11% 5% 3 2 2 3 18%	5468
	11th to 20th	Night	15% 15% 6% 15% 7% 5% 5% 3 4 5% 23%	5089
	21st to end	Night	20% 18% 8% 20% 5% 4 3 2 2 3 15%	5288
April	1st to 10th	Night	22% 15% 7% 11% 6% 4 3 4 4 4 20%	2011
	11th to 20th	Night	18% 15% 5% 9% 4 4 4 3 5% 5% 28%	1976
	21st to end	Night	19% 17% 4 7% 5% 4 3 3 4 4 30%	1799
May	1st to 10th	Night	25% 20% 5% 7% 4 4 4 3 4 5% 20%	3615
	11th to 20th	Night	14% 13% 3 5% 4 4 5% 5% 7% 8% 32%	3596
	21st to end	Night	15% 9% 3 7% 5% 5% 6% 4 6% 8% 31%	3948
June	1st to 10th	Night	24% 12% 3 8% 5% 5% 4 3 5% 6% 23%	1600
	11th to 20th	Night	20% 9% 3 6% 5% 4 4 4 5% 5% 37%	1600
	21st to end	Night	25% 12% 3 8% 5% 6% 5% 3 5% 6% 24%	1600
July	1st to 10th	Night	22% 9% 3 8% 6% 6% 6% 4 5% 7% 23%	3619
	11th to 20th	Night	21% 8% 2 6% 4 4 4 3 5% 7% 36%	3620
	21st to end	Night	20% 9% 3 7% 5% 4 5% 4 6% 7% 30%	3948
August	1st to 10th	Night	21% 10% 3 9% 4 5% 5% 4 6% 7% 26%	2618
	11th to 20th	Night	22% 7% 2 7% 5% 5% 4 4 7% 7% 30%	2872
	21st to end	Night	17% 6% 2 5% 4 4 4 4 6% 7% 41%	3583
September	1st to 10th	Night	19% 8% 2 7% 5% 4 5% 4 5% 6% 35%	2000
	11th to 20th	Night	25% 8% 3 5% 4 4 3 3 4 6% 35%	2000
	21st to end	Night	21% 11% 3 7% 5% 3 4 3 4 6% 32%	2268
October	1st to 10th	Night	23% 10% 3 6% 4 5% 4 4 5% 6% 30%	2400
	11th to 20th	Night	28% 13% 2 7% 5% 4 4 3 5% 6% 23%	2400
	21st to end	Night	27% 19% 4 7% 5% 5% 4 3 4 4 18%	2810
November	1st to 10th	Night	23% 26% 4 8% 4 4 3 3 4 4 16%	2705
	11th to 20th	Night	24% 28% 7% 9% 4 4 3 3 4 4 12%	2940
	21st to end	Night	21% 29% 11% 12% 5% 4 3 2 3 3 8%	2940
December	1st to 10th	Night	16% 21% 11% 24% 4 4 3 2 3 3 8%	4720
	11th to 20th	Night	24% 21% 9% 22% 5% 3 2 2 2 2 9%	5353
	21st to end	Night	21% 17% 8% 23% 5% 4 3 2 2 4 11%	7150

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	85% 7% 3 4 1	4691
	11th to 20th	Day	86% 4 5% 3 1	4710
	21st to end	Day	80% 5% 5% 6% 3	5306
February	1st to 10th	Day	82% 4 6% 6% 2	1890
	11th to 20th	Day	80% 6% 6% 5% 2 1	1851
	21st to end	Day	67% 5% 10% 11% 6% 1	1706
March	1st to 10th	Day	71% 3 7% 12% 7%	4578
	11th to 20th	Day	66% 7% 13% 11% 3	5090
	21st to end	Day	77% 3 8% 8% 4 1	5885
April	1st to 10th	Day	67% 7% 8% 11% 6% 2	2412
	11th to 20th	Day	58% 5% 10% 16% 10% 1	2374
	21st to end	Day	58% 6% 11% 14% 9% 1	2599
May	1st to 10th	Day	65% 9% 8% 12% 5%	6357
	11th to 20th	Day	50% 9% 16% 19% 7%	6322
	21st to end	Day	50% 10% 11% 22% 6%	6948
June	1st to 10th	Day	60% 7% 12% 14% 6%	2800
	11th to 20th	Day	50% 7% 13% 20% 9%	2800
	21st to end	Day	61% 8% 9% 13% 8% 1	2800
July	1st to 10th	Day	59% 7% 13% 14% 6% 1	6290
	11th to 20th	Day	50% 6% 13% 26% 5%	6284
	21st to end	Day	50% 8% 17% 21% 5%	6730
August	1st to 10th	Day	58% 7% 12% 17% 5%	4524
	11th to 20th	Day	53% 8% 14% 21% 4	4214
	21st to end	Day	46% 7% 12% 24% 10%	4314
September	1st to 10th	Day	48% 7% 13% 23% 10% 1	2400
	11th to 20th	Day	55% 5% 12% 20% 7%	2400
	21st to end	Day	50% 8% 10% 21% 10% 1	2128
October	1st to 10th	Day	59% 6% 9% 17% 8%	3260
	11th to 20th	Day	61% 5% 11% 17% 6%	3240
	21st to end	Day	65% 5% 10% 17% 2	3264
November	1st to 10th	Day	75% 6% 8% 9% 2	1808
	11th to 20th	Day	81% 4 6% 7% 2	1680
	21st to end	Day	81% 5% 9% 4 1	1680
December	1st to 10th	Day	85% 5% 5% 4 1	2690
	11th to 20th	Day	85% 4 4 6% 1	3075
	21st to end	Day	80% 7% 6% 5% 2	4070
January	1st to 10th	Night	84% 7% 4 3 1	8234
	11th to 20th	Night	88% 5% 4 2 1	8280
	21st to end	Night	83% 5% 4 4 4	8897
February	1st to 10th	Night	79% 5% 6% 7% 3	2730
	11th to 20th	Night	77% 6% 6% 9% 2	2666
	21st to end	Night	68% 8% 8% 10% 6% 1	2099
March	1st to 10th	Night	73% 4 6% 8% 8% 1	5477
	11th to 20th	Night	61% 9% 13% 11% 6%	5090
	21st to end	Night	76% 3 4 11% 4 1	5288
April	1st to 10th	Night	65% 7% 9% 10% 9%	2011
	11th to 20th	Night	56% 7% 8% 18% 10% 1	1976
	21st to end	Night	58% 6% 9% 17% 10% 1	1799
May	1st to 10th	Night	62% 10% 8% 12% 7%	3620
	11th to 20th	Night	46% 9% 15% 23% 6% 1	3597
	21st to end	Night	44% 13% 14% 22% 7%	3949
June	1st to 10th	Night	62% 7% 10% 15% 6% 1	1600
	11th to 20th	Night	48% 8% 12% 19% 13% 1	1600
	21st to end	Night	59% 9% 11% 13% 8%	1600
July	1st to 10th	Night	59% 7% 15% 13% 5% 1	3581
	11th to 20th	Night	47% 7% 14% 22% 9% 1	3572
	21st to end	Night	52% 7% 16% 19% 6%	3831
August	1st to 10th	Night	56% 10% 14% 16% 4	2607
	11th to 20th	Night	50% 9% 18% 20% 3	2899
	21st to end	Night	40% 8% 16% 28% 8%	3582
September	1st to 10th	Night	47% 9% 13% 22% 10%	2000
	11th to 20th	Night	51% 6% 13% 21% 9% 1	2000
	21st to end	Night	51% 8% 10% 24% 7% 1	2268
October	1st to 10th	Night	53% 7% 11% 20% 8%	3920
	11th to 20th	Night	62% 6% 8% 19% 4	3899
	21st to end	Night	65% 4 10% 17% 4	4535
November	1st to 10th	Night	70% 8% 11% 9% 2	2705
	11th to 20th	Night	76% 7% 8% 7% 2	2940
	21st to end	Night	82% 7% 7% 4 1	2940
December	1st to 10th	Night	82% 5% 6% 6% 1	4720
	11th to 20th	Night	85% 5% 4 5% 1	5355
	21st to end	Night	78% 5% 6% 9% 2	7150

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	34% 32% 27% 6% 1	430
	11th to 20th	Day	37% 27% 23% 11% 1 1	430
	21st to end	Day	29% 33% 28% 8% 2	473
February	1st to 10th	Day	34% 32% 21% 10% 3	430
	11th to 20th	Day	39% 32% 19% 8% 1	426
	21st to end	Day	26% 31% 29% 9% 4	355
March	1st to 10th	Day	32% 29% 27% 9% 3	430
	11th to 20th	Day	29% 30% 27% 8% 4 1	540
	21st to end	Day	37% 30% 22% 8% 3 1	594
April	1st to 10th	Day	40% 30% 20% 8% 2	504
	11th to 20th	Day	35% 30% 23% 9% 3	492
	21st to end	Day	31% 26% 28% 11% 3 1	570
May	1st to 10th	Day	38% 21% 24% 11% 4 2	703
	11th to 20th	Day	27% 21% 29% 15% 8% 1	724
	21st to end	Day	29% 24% 29% 14% 4	790
June	1st to 10th	Day	36% 21% 22% 16% 5%	730
	11th to 20th	Day	24% 21% 34% 15% 5% 2	730
	21st to end	Day	36% 17% 26% 16% 5% 1	730
July	1st to 10th	Day	25% 17% 31% 20% 6% 1	720
	11th to 20th	Day	23% 16% 32% 21% 8%	718
	21st to end	Day	28% 16% 31% 17% 7%	795
August	1st to 10th	Day	23% 13% 33% 21% 10% 1	712
	11th to 20th	Day	25% 15% 32% 18% 8% 1	519
	21st to end	Day	23% 19% 34% 19% 6%	583
September	1st to 10th	Day	22% 19% 39% 14% 5% 1	530
	11th to 20th	Day	33% 19% 30% 13% 4 1	530
	21st to end	Day	30% 23% 23% 17% 6% 1	425
October	1st to 10th	Day	31% 22% 28% 12% 5% 2	420
	11th to 20th	Day	34% 22% 23% 13% 5% 2	420
	21st to end	Day	38% 27% 21% 8% 5%	462
November	1st to 10th	Day	43% 27% 19% 9% 2 1	425
	11th to 20th	Day	41% 27% 20% 8% 2 1	430
	21st to end	Day	38% 30% 23% 8% 1	430
December	1st to 10th	Day	41% 27% 23% 7% 2	430
	11th to 20th	Day	42% 29% 21% 7% 1	430
	21st to end	Day	35% 34% 19% 9% 2 1	473
January	1st to 10th	Night	33% 30% 24% 10% 2	950
	11th to 20th	Night	35% 27% 24% 10% 3	950
	21st to end	Night	31% 30% 24% 12% 3	1015
February	1st to 10th	Night	31% 26% 25% 15% 3	840
	11th to 20th	Night	32% 31% 22% 12% 3	823
	21st to end	Night	25% 24% 30% 16% 5%	692
March	1st to 10th	Night	25% 26% 31% 15% 3	840
	11th to 20th	Night	26% 22% 26% 19% 6% 1	840
	21st to end	Night	32% 23% 25% 15% 5% 1	793
April	1st to 10th	Night	33% 24% 23% 17% 3	604
	11th to 20th	Night	29% 20% 25% 21% 4	594
	21st to end	Night	27% 21% 26% 18% 9%	600
May	1st to 10th	Night	31% 18% 24% 18% 8% 1	600
	11th to 20th	Night	24% 15% 26% 24% 9% 1	592
	21st to end	Night	23% 19% 30% 24% 4	649
June	1st to 10th	Night	31% 13% 29% 23% 5%	600
	11th to 20th	Night	23% 14% 30% 26% 7% 1	600
	21st to end	Night	30% 12% 29% 25% 4	600
July	1st to 10th	Night	20% 11% 31% 28% 10%	586
	11th to 20th	Night	21% 10% 28% 33% 8%	582
	21st to end	Night	27% 8% 25% 31% 8%	656
August	1st to 10th	Night	18% 10% 26% 35% 10% 1	598
	11th to 20th	Night	25% 9% 23% 29% 13% 1	592
	21st to end	Night	21% 9% 25% 33% 12%	660
September	1st to 10th	Night	21% 14% 28% 29% 8% 1	600
	11th to 20th	Night	29% 15% 21% 24% 10% 1	600
	21st to end	Night	28% 17% 27% 21% 6% 1	679
October	1st to 10th	Night	29% 18% 22% 23% 9%	800
	11th to 20th	Night	35% 19% 19% 18% 8% 1	800
	21st to end	Night	38% 25% 21% 12% 4	974
November	1st to 10th	Night	40% 24% 22% 12% 3	930
	11th to 20th	Night	41% 24% 20% 10% 4 1	950
	21st to end	Night	39% 27% 21% 11% 2	950
December	1st to 10th	Night	37% 27% 22% 10% 3	950
	11th to 20th	Night	40% 29% 21% 7% 2	950
	21st to end	Night	37% 28% 23% 9% 2 1	1045

Page generated at 2026-03-30 03:18:45. Version ac07

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