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 2024-12-09.

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	21% 15% 5% 11% 6% 4 4 3 4 5% 22%	101915
	Night	20% 16% 6% 13% 6% 4 4 3 4 5% 20%	97990
Transparency	Day	63% 7% 10% 14% 5%	105406
	Night	66% 8% 9% 12% 5%	102597
Seeing	Day	31% 24% 27% 13% 4 1	17775
	Night	30% 21% 25% 18% 5%	25213

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% 19% 10% 29% 9% 4 3 2 2 3 6%	2526
	11th to 20th	Day	12% 22% 8% 21% 15% 5% 3 2 3 3 7%	2530
	21st to end	Day	12% 14% 9% 25% 11% 4 4 3 3 4 11%	2854
February	1st to 10th	Day	19% 15% 7% 20% 11% 6% 5% 2 3 3 10%	1710
	11th to 20th	Day	15% 21% 7% 15% 12% 6% 6% 3 3 2 10%	1663
	21st to end	Day	10% 18% 7% 12% 10% 7% 4 3 4 5% 20%	1548
March	1st to 10th	Day	22% 14% 5% 9% 5% 7% 2 2 2 4 27%	3114
	11th to 20th	Day	11% 25% 10% 16% 7% 5% 4 2 3 3 13%	3480
	21st to end	Day	20% 21% 9% 14% 6% 4 3 3 4 4 13%	4024
April	1st to 10th	Day	18% 19% 7% 12% 5% 4 4 3 4 4 20%	2280
	11th to 20th	Day	20% 17% 5% 7% 4 3 3 2 4 5% 29%	2254
	21st to end	Day	19% 17% 4 7% 5% 4 4 3 4 5% 27%	2468
May	1st to 10th	Day	24% 21% 5% 8% 4 4 4 3 4 4 19%	4425
	11th to 20th	Day	18% 9% 3 7% 5% 6% 5% 3 6% 7% 31%	4398
	21st to end	Day	21% 12% 3 8% 6% 6% 5% 4 6% 7% 23%	4836
June	1st to 10th	Day	28% 15% 3 7% 4 4 3 3 6% 7% 21%	2660
	11th to 20th	Day	20% 9% 3 7% 4 4 4 4 5% 8% 33%	2660
	21st to end	Day	28% 10% 3 8% 5% 5% 4 4 4 5% 23%	2660
July	1st to 10th	Day	26% 8% 3 7% 5% 4 5% 4 6% 7% 27%	4440
	11th to 20th	Day	28% 7% 2 6% 4 4 5% 4 5% 7% 28%	4440
	21st to end	Day	19% 9% 3 7% 5% 4 5% 4 6% 7% 32%	4815
August	1st to 10th	Day	27% 9% 3 8% 6% 5% 5% 4 6% 7% 23%	4399
	11th to 20th	Day	19% 9% 3 9% 4 5% 5% 4 6% 8% 26%	4045
	21st to end	Day	18% 7% 2 7% 5% 4 5% 4 6% 7% 36%	4182
September	1st to 10th	Day	22% 8% 3 6% 4 4 3 4 6% 7% 33%	2280
	11th to 20th	Day	26% 9% 3 7% 4 4 4 3 4 6% 30%	2280
	21st to end	Day	24% 9% 3 5% 4 4 4 4 5% 6% 31%	2022
October	1st to 10th	Day	26% 11% 3 8% 3 4 4 3 5% 7% 26%	1900
	11th to 20th	Day	27% 16% 3 8% 4 4 4 4 4 5% 21%	1900
	21st to end	Day	27% 22% 4 7% 5% 4 4 3 3 5% 16%	1929
November	1st to 10th	Day	26% 25% 4 8% 4 3 3 3 4 5% 15%	1720
	11th to 20th	Day	22% 31% 8% 9% 5% 4 3 2 3 4 11%	1600
	21st to end	Day	15% 30% 12% 14% 4 5% 2 2 4 4 8%	1600
December	1st to 10th	Day	22% 29% 10% 16% 6% 3 2 2 2 2 6%	1584
	11th to 20th	Day	29% 21% 11% 19% 4 3 3 2 2 2 4	1906
	21st to end	Day	19% 25% 12% 18% 5% 4 3 2 2 2 7%	2783
January	1st to 10th	Night	11% 17% 10% 38% 6% 4 3 2 2 2 5%	4429
	11th to 20th	Night	16% 19% 6% 31% 11% 4 3 1 2 2 5%	4440
	21st to end	Night	11% 17% 8% 23% 12% 4 3 2 3 3 14%	4809
February	1st to 10th	Night	17% 16% 5% 17% 13% 6% 5% 2 4 3 11%	2470
	11th to 20th	Night	15% 21% 6% 16% 11% 6% 4 2 3 3 12%	2403
	21st to end	Night	10% 18% 7% 15% 10% 6% 5% 3 4 5% 17%	1905
March	1st to 10th	Night	18% 14% 5% 12% 9% 5% 3 2 3 4 24%	3708
	11th to 20th	Night	16% 18% 7% 15% 7% 4 5% 3 3 4 18%	3479
	21st to end	Night	20% 18% 8% 17% 6% 5% 3 2 2 3 16%	3607
April	1st to 10th	Night	21% 15% 7% 11% 6% 5% 4 4 4 4 21%	1900
	11th to 20th	Night	18% 14% 5% 9% 4 4 4 3 5% 6% 29%	1876
	21st to end	Night	19% 16% 4 7% 4 4 3 3 4 4 31%	1710
May	1st to 10th	Night	25% 22% 4 6% 4 3 3 3 4 6% 20%	2525
	11th to 20th	Night	16% 12% 3 6% 4 4 4 5% 6% 6% 34%	2506
	21st to end	Night	18% 11% 3 8% 5% 6% 7% 5% 7% 8% 23%	2749
June	1st to 10th	Night	25% 13% 4 9% 5% 5% 4 3 5% 6% 21%	1520
	11th to 20th	Night	20% 9% 3 6% 5% 4 4 4 5% 5% 36%	1520
	21st to end	Night	25% 12% 3 8% 5% 6% 4 3 5% 6% 23%	1520
July	1st to 10th	Night	25% 9% 3 8% 5% 5% 6% 4 5% 6% 25%	2530
	11th to 20th	Night	28% 8% 2 6% 4 4 4 4 6% 6% 28%	2530
	21st to end	Night	18% 10% 3 7% 5% 4 5% 4 6% 6% 32%	2750
August	1st to 10th	Night	21% 11% 3 9% 4 5% 5% 4 6% 7% 24%	2537
	11th to 20th	Night	23% 7% 2 7% 5% 5% 4 4 7% 7% 30%	2782
	21st to end	Night	17% 6% 2 5% 4 4 4 4 6% 7% 40%	3473
September	1st to 10th	Night	19% 8% 2 7% 5% 4 5% 4 5% 6% 34%	1900
	11th to 20th	Night	26% 8% 2 5% 4 4 3 3 4 6% 34%	1900
	21st to end	Night	21% 11% 3 7% 6% 3 4 2 4 6% 32%	2154
October	1st to 10th	Night	23% 10% 3 6% 4 5% 4 4 5% 6% 28%	2280
	11th to 20th	Night	29% 13% 3 7% 5% 4 4 3 5% 5% 23%	2280
	21st to end	Night	28% 20% 4 7% 5% 5% 4 3 4 4 17%	2669
November	1st to 10th	Night	22% 26% 4 8% 4 4 3 3 4 5% 17%	2573
	11th to 20th	Night	24% 27% 7% 9% 4 4 3 3 4 4 12%	2800
	21st to end	Night	21% 28% 11% 12% 5% 4 3 2 3 3 8%	2800
December	1st to 10th	Night	22% 25% 10% 17% 4 3 4 2 3 3 7%	2779
	11th to 20th	Night	28% 23% 10% 18% 5% 3 2 1 1 2 6%	3293
	21st to end	Night	26% 21% 10% 20% 4 3 2 1 2 3 9%	4884

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	82% 11% 4 3 1	2527
	11th to 20th	Day	84% 6% 5% 4 1	2530
	21st to end	Day	74% 8% 8% 5% 5%	2854
February	1st to 10th	Day	81% 5% 6% 6% 3	1710
	11th to 20th	Day	79% 7% 7% 5% 2 1	1671
	21st to end	Day	66% 6% 11% 10% 6% 1	1548
March	1st to 10th	Day	63% 4 9% 14% 9%	3118
	11th to 20th	Day	73% 7% 9% 8% 3	3480
	21st to end	Day	74% 4 10% 7% 4 1	4024
April	1st to 10th	Day	66% 7% 8% 11% 6% 1	2280
	11th to 20th	Day	57% 5% 10% 17% 10% 1	2254
	21st to end	Day	57% 7% 12% 14% 10% 1	2468
May	1st to 10th	Day	64% 11% 10% 10% 5% 1	4440
	11th to 20th	Day	49% 10% 14% 20% 6%	4402
	21st to end	Day	54% 13% 12% 16% 6%	4836
June	1st to 10th	Day	62% 7% 13% 14% 5%	2660
	11th to 20th	Day	50% 8% 13% 20% 9%	2660
	21st to end	Day	62% 8% 10% 13% 7% 1	2660
July	1st to 10th	Day	56% 8% 12% 16% 8% 1	4370
	11th to 20th	Day	55% 7% 12% 20% 5%	4364
	21st to end	Day	50% 9% 16% 20% 5%	4662
August	1st to 10th	Day	60% 7% 13% 17% 3	4385
	11th to 20th	Day	54% 8% 13% 20% 4	4084
	21st to end	Day	46% 7% 12% 24% 10%	4182
September	1st to 10th	Day	49% 7% 13% 21% 9% 1	2280
	11th to 20th	Day	55% 5% 12% 20% 7%	2280
	21st to end	Day	51% 9% 10% 21% 9% 1	2022
October	1st to 10th	Day	59% 6% 9% 17% 8%	3160
	11th to 20th	Day	61% 5% 11% 17% 6%	3140
	21st to end	Day	66% 5% 10% 17% 2	3163
November	1st to 10th	Day	74% 6% 8% 10% 2	1720
	11th to 20th	Day	80% 5% 6% 7% 2	1600
	21st to end	Day	81% 5% 9% 4 1	1600
December	1st to 10th	Day	85% 7% 5% 2 1	1584
	11th to 20th	Day	89% 4 4 3	1905
	21st to end	Day	83% 7% 6% 2 1	2783
January	1st to 10th	Night	83% 11% 4 2	4429
	11th to 20th	Night	86% 6% 3 2 2	4440
	21st to end	Night	74% 8% 6% 6% 6%	4809
February	1st to 10th	Night	78% 5% 6% 7% 3	2470
	11th to 20th	Night	77% 6% 7% 8% 2	2406
	21st to end	Night	67% 9% 9% 10% 6% 1	1905
March	1st to 10th	Night	63% 6% 8% 11% 12% 1	3717
	11th to 20th	Night	66% 11% 9% 11% 4	3480
	21st to end	Night	74% 4 6% 11% 4 1	3607
April	1st to 10th	Night	64% 7% 10% 10% 9%	1900
	11th to 20th	Night	54% 8% 8% 18% 10% 1	1876
	21st to end	Night	57% 6% 9% 17% 10% 1	1710
May	1st to 10th	Night	58% 13% 10% 13% 6% 1	2530
	11th to 20th	Night	46% 10% 13% 24% 7% 1	2507
	21st to end	Night	50% 16% 15% 15% 4	2750
June	1st to 10th	Night	63% 7% 10% 13% 5% 1	1520
	11th to 20th	Night	49% 8% 12% 18% 13% 1	1520
	21st to end	Night	60% 9% 11% 13% 7%	1520
July	1st to 10th	Night	59% 7% 14% 13% 5% 2	2491
	11th to 20th	Night	54% 8% 13% 16% 8% 1	2482
	21st to end	Night	51% 9% 14% 18% 8%	2663
August	1st to 10th	Night	57% 10% 14% 15% 3	2526
	11th to 20th	Night	50% 9% 18% 19% 3	2809
	21st to end	Night	40% 8% 16% 28% 8%	3472
September	1st to 10th	Night	48% 9% 13% 20% 9%	1900
	11th to 20th	Night	51% 6% 13% 20% 9% 1	1900
	21st to end	Night	51% 8% 10% 23% 7% 1	2154
October	1st to 10th	Night	53% 8% 11% 20% 8%	3800
	11th to 20th	Night	63% 6% 8% 19% 4	3779
	21st to end	Night	65% 4 10% 17% 3	4394
November	1st to 10th	Night	69% 8% 11% 9% 2	2573
	11th to 20th	Night	76% 7% 8% 7% 2	2800
	21st to end	Night	82% 7% 7% 4 1	2800
December	1st to 10th	Night	83% 7% 6% 4 1	2779
	11th to 20th	Night	88% 4 4 3 1	3295
	21st to end	Night	83% 4 7% 5% 1	4884

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% 33% 26% 5% 2	370
	11th to 20th	Day	36% 29% 24% 10% 1	370
	21st to end	Day	26% 33% 29% 9% 2	407
February	1st to 10th	Day	35% 32% 21% 9% 3	370
	11th to 20th	Day	38% 34% 18% 8% 1	366
	21st to end	Day	24% 33% 28% 10% 4	307
March	1st to 10th	Day	28% 31% 28% 9% 3 1	370
	11th to 20th	Day	27% 31% 28% 9% 5% 1	460
	21st to end	Day	34% 30% 23% 10% 3 1	506
April	1st to 10th	Day	38% 31% 21% 8% 2	460
	11th to 20th	Day	34% 31% 23% 9% 3	452
	21st to end	Day	29% 26% 29% 12% 3	526
May	1st to 10th	Day	38% 21% 23% 11% 5% 2	653
	11th to 20th	Day	26% 21% 29% 16% 8% 1	674
	21st to end	Day	30% 25% 28% 14% 3	735
June	1st to 10th	Day	36% 21% 22% 16% 5%	680
	11th to 20th	Day	23% 21% 34% 15% 5% 1	680
	21st to end	Day	34% 17% 26% 16% 5% 1	680
July	1st to 10th	Day	25% 17% 32% 21% 5% 1	670
	11th to 20th	Day	24% 17% 31% 21% 8%	668
	21st to end	Day	29% 16% 31% 17% 7%	740
August	1st to 10th	Day	25% 13% 32% 20% 10% 1	663
	11th to 20th	Day	26% 15% 32% 18% 8% 1	479
	21st to end	Day	22% 18% 34% 19% 6%	539
September	1st to 10th	Day	24% 20% 38% 13% 4 1	490
	11th to 20th	Day	33% 20% 29% 13% 4 1	490
	21st to end	Day	30% 23% 23% 17% 6% 1	395
October	1st to 10th	Day	31% 22% 28% 12% 5% 2	390
	11th to 20th	Day	35% 23% 23% 12% 4 3	390
	21st to end	Day	38% 28% 21% 8% 4	429
November	1st to 10th	Day	39% 29% 20% 9% 2 1	395
	11th to 20th	Day	41% 27% 20% 8% 3 1	400
	21st to end	Day	38% 31% 23% 8% 1	400
December	1st to 10th	Day	40% 27% 23% 7% 2	394
	11th to 20th	Day	41% 29% 22% 7% 1	370
	21st to end	Day	34% 36% 18% 9% 2 1	407
January	1st to 10th	Night	33% 31% 24% 10% 2	850
	11th to 20th	Night	34% 29% 24% 10% 2	850
	21st to end	Night	29% 30% 24% 13% 3	911
February	1st to 10th	Night	32% 26% 24% 16% 2	760
	11th to 20th	Night	33% 32% 22% 11% 2	743
	21st to end	Night	25% 24% 29% 17% 5%	628
March	1st to 10th	Night	23% 26% 32% 16% 3	760
	11th to 20th	Night	26% 23% 25% 20% 6% 1	760
	21st to end	Night	31% 23% 25% 15% 5% 1	717
April	1st to 10th	Night	31% 24% 23% 18% 3	570
	11th to 20th	Night	27% 21% 25% 21% 4	564
	21st to end	Night	27% 21% 25% 18% 9%	570
May	1st to 10th	Night	31% 17% 24% 18% 8% 1	570
	11th to 20th	Night	25% 14% 26% 25% 9% 1	562
	21st to end	Night	24% 19% 30% 24% 4	616
June	1st to 10th	Night	31% 13% 28% 23% 5%	570
	11th to 20th	Night	24% 14% 29% 26% 7% 1	570
	21st to end	Night	30% 12% 28% 25% 4	570
July	1st to 10th	Night	20% 11% 31% 28% 10%	556
	11th to 20th	Night	22% 10% 28% 31% 8%	552
	21st to end	Night	27% 8% 25% 31% 9%	623
August	1st to 10th	Night	19% 11% 26% 34% 10% 1	568
	11th to 20th	Night	25% 10% 23% 28% 13% 1	562
	21st to end	Night	21% 9% 25% 33% 13%	627
September	1st to 10th	Night	21% 14% 28% 29% 7% 1	570
	11th to 20th	Night	30% 15% 21% 23% 10% 1	570
	21st to end	Night	28% 17% 27% 20% 6% 1	645
October	1st to 10th	Night	29% 18% 21% 23% 9%	760
	11th to 20th	Night	36% 19% 20% 16% 8% 1	760
	21st to end	Night	39% 26% 20% 11% 4	921
November	1st to 10th	Night	39% 24% 22% 12% 3	880
	11th to 20th	Night	41% 24% 21% 10% 4 1	900
	21st to end	Night	39% 27% 21% 11% 2	900
December	1st to 10th	Night	37% 28% 22% 10% 3	893
	11th to 20th	Night	40% 30% 21% 7% 2	850
	21st to end	Night	37% 29% 23% 8% 2 1	935

Page generated at 2024-12-06 04:54:47. Version ac07

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