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 2024-01-16.

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	22% 14% 6% 9% 6% 3 4 4 4 6% 22%	74764
	Night	21% 15% 6% 11% 7% 3 4 4 4 5% 20%	75052
Transparency	Day	64% 7% 10% 13% 5%	74467
	Night	67% 7% 9% 12% 5%	74884
Seeing	Day	31% 24% 27% 13% 4 1	16493
	Night	30% 21% 25% 18% 5%	24027

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	16% 21% 11% 20% 10% 4 3 2 2 3 7%	1516
	11th to 20th	Day	19% 18% 9% 20% 10% 5% 4 3 3 3 7%	1481
	21st to end	Day	12% 15% 11% 23% 14% 4 4 2 3 3 8%	1629
February	1st to 10th	Day	19% 13% 8% 17% 14% 5% 5% 4 2 4 9%	1620
	11th to 20th	Day	15% 19% 8% 14% 11% 5% 7% 3 3 3 10%	1573
	21st to end	Day	9% 16% 8% 11% 11% 7% 4 4 4 5% 20%	1459
March	1st to 10th	Day	12% 16% 9% 12% 10% 5% 4 3 3 5% 20%	1796
	11th to 20th	Day	14% 15% 8% 16% 9% 4 4 4 4 4 18%	1980
	21st to end	Day	17% 18% 9% 12% 7% 3 3 3 3 4 20%	2289
April	1st to 10th	Day	19% 18% 6% 11% 6% 3 4 4 4 5% 20%	2160
	11th to 20th	Day	21% 16% 6% 7% 4 2 3 3 4 5% 29%	2134
	21st to end	Day	20% 16% 5% 6% 6% 3 4 4 4 6% 26%	2337
May	1st to 10th	Day	25% 17% 4 6% 4 3 4 4 4 5% 24%	2520
	11th to 20th	Day	22% 11% 3 6% 5% 4 4 4 4 6% 29%	2478
	21st to end	Day	23% 11% 3 6% 6% 3 4 4 5% 8% 27%	2724
June	1st to 10th	Day	29% 14% 3 6% 4 3 4 3 6% 7% 22%	2520
	11th to 20th	Day	21% 8% 3 6% 5% 3 4 5% 4 8% 33%	2520
	21st to end	Day	28% 9% 3 7% 6% 3 5% 5% 4 6% 24%	2520
July	1st to 10th	Day	20% 7% 3 6% 5% 3 4 6% 6% 8% 31%	2520
	11th to 20th	Day	22% 7% 3 6% 5% 3 5% 5% 6% 7% 31%	2520
	21st to end	Day	24% 10% 4 7% 6% 4 5% 5% 5% 6% 24%	2745
August	1st to 10th	Day	22% 7% 2 6% 6% 3 5% 5% 6% 9% 28%	2495
	11th to 20th	Day	23% 8% 3 7% 6% 3 5% 5% 6% 7% 27%	2304
	21st to end	Day	23% 7% 3 6% 6% 3 4 5% 6% 8% 29%	2378
September	1st to 10th	Day	23% 8% 3 5% 5% 3 4 4 6% 7% 33%	2160
	11th to 20th	Day	28% 9% 4 7% 4 3 3 4 4 6% 29%	2160
	21st to end	Day	25% 9% 3 5% 4 3 4 5% 5% 6% 32%	1917
October	1st to 10th	Day	27% 11% 3 6% 4 3 4 4 5% 8% 26%	1800
	11th to 20th	Day	27% 16% 3 7% 6% 3 5% 5% 3 6% 21%	1800
	21st to end	Day	28% 22% 4 6% 6% 3 4 4 3 5% 15%	1828
November	1st to 10th	Day	27% 23% 4 7% 5% 3 3 3 4 5% 16%	1632
	11th to 20th	Day	22% 29% 8% 9% 5% 3 3 2 3 4 12%	1520
	21st to end	Day	15% 28% 13% 13% 5% 3 4 2 4 4 8%	1520
December	1st to 10th	Day	24% 26% 13% 15% 6% 2 2 3 2 2 6%	1520
	11th to 20th	Day	29% 19% 13% 18% 6% 2 3 2 2 2 4	1906
	21st to end	Day	20% 23% 13% 17% 7% 3 3 2 2 2 7%	2783
January	1st to 10th	Night	17% 21% 12% 21% 11% 4 2 2 2 2 5%	2649
	11th to 20th	Night	20% 17% 9% 21% 12% 4 4 3 3 3 5%	2601
	21st to end	Night	15% 15% 9% 20% 13% 5% 5% 3 2 3 9%	2725
February	1st to 10th	Night	17% 15% 7% 16% 14% 6% 6% 3 4 4 10%	2340
	11th to 20th	Night	16% 19% 6% 14% 13% 6% 4 3 3 3 12%	2273
	21st to end	Night	10% 16% 8% 13% 11% 6% 6% 4 4 5% 17%	1796
March	1st to 10th	Night	13% 13% 8% 14% 10% 4 5% 4 4 5% 21%	2147
	11th to 20th	Night	15% 13% 7% 13% 9% 3 5% 4 4 5% 23%	1979
	21st to end	Night	17% 16% 7% 11% 8% 3 5% 3 3 5% 22%	2066
April	1st to 10th	Night	21% 14% 7% 11% 6% 3 5% 4 4 4 21%	1800
	11th to 20th	Night	19% 13% 6% 8% 5% 3 4 4 4 6% 28%	1776
	21st to end	Night	20% 15% 5% 6% 5% 3 4 4 4 4 30%	1621
May	1st to 10th	Night	26% 12% 3 6% 4 3 4 3 5% 6% 28%	1440
	11th to 20th	Night	20% 12% 3 5% 5% 3 4 6% 5% 5% 33%	1416
	21st to end	Night	19% 10% 4 8% 5% 3 5% 5% 6% 6% 28%	1550
June	1st to 10th	Night	25% 11% 4 8% 6% 4 5% 3 5% 6% 22%	1440
	11th to 20th	Night	21% 8% 3 6% 5% 3 5% 4 5% 5% 35%	1440
	21st to end	Night	25% 11% 4 7% 5% 5% 4 5% 5% 6% 24%	1440
July	1st to 10th	Night	17% 7% 4 7% 7% 3 7% 5% 4 8% 32%	1440
	11th to 20th	Night	19% 7% 2 6% 6% 3 6% 6% 7% 7% 30%	1440
	21st to end	Night	23% 10% 3 6% 6% 3 5% 5% 6% 8% 25%	1573
August	1st to 10th	Night	16% 6% 3 7% 6% 3 5% 6% 7% 8% 33%	1441
	11th to 20th	Night	24% 8% 3 5% 6% 4 5% 4 6% 5% 30%	1596
	21st to end	Night	18% 6% 2 4 6% 3 5% 5% 6% 8% 36%	1977
September	1st to 10th	Night	19% 8% 2 6% 6% 3 5% 5% 5% 7% 34%	1800
	11th to 20th	Night	27% 8% 3 5% 5% 3 4 3 4 6% 34%	1800
	21st to end	Night	22% 10% 4 6% 7% 3 4 3 4 6% 32%	2040
October	1st to 10th	Night	23% 11% 3 5% 5% 4 4 5% 5% 6% 28%	2160
	11th to 20th	Night	29% 13% 3 6% 5% 3 5% 4 5% 6% 23%	2160
	21st to end	Night	29% 19% 4 6% 6% 4 4 4 4 4 16%	2528
November	1st to 10th	Night	23% 23% 4 7% 6% 3 4 4 4 5% 18%	2441
	11th to 20th	Night	24% 25% 7% 8% 5% 3 4 3 4 4 12%	2660
	21st to end	Night	22% 27% 12% 11% 6% 3 3 3 3 3 9%	2660
December	1st to 10th	Night	23% 22% 13% 15% 5% 2 4 3 3 3 7%	2660
	11th to 20th	Night	28% 21% 12% 17% 6% 2 2 2 1 2 6%	3293
	21st to end	Night	26% 19% 11% 19% 5% 2 2 2 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	86% 5% 4 4 1	1517
	11th to 20th	Day	84% 6% 5% 4 1	1481
	21st to end	Day	82% 6% 3 6% 2	1629
February	1st to 10th	Day	82% 5% 6% 5% 3	1620
	11th to 20th	Day	78% 7% 7% 5% 2 1	1581
	21st to end	Day	66% 6% 11% 9% 6% 1	1459
March	1st to 10th	Day	67% 6% 8% 13% 7%	1800
	11th to 20th	Day	69% 6% 8% 12% 4	1980
	21st to end	Day	69% 4 9% 10% 6% 2	2289
April	1st to 10th	Day	66% 7% 8% 11% 6% 2	2160
	11th to 20th	Day	57% 5% 10% 17% 10% 1	2134
	21st to end	Day	57% 7% 12% 14% 9% 1	2337
May	1st to 10th	Day	63% 6% 10% 13% 8% 1	2520
	11th to 20th	Day	57% 6% 9% 19% 9%	2482
	21st to end	Day	56% 8% 10% 19% 8%	2724
June	1st to 10th	Day	61% 7% 13% 14% 5%	2520
	11th to 20th	Day	51% 7% 12% 20% 9%	2520
	21st to end	Day	61% 8% 10% 13% 8% 1	2520
July	1st to 10th	Day	48% 11% 14% 21% 6%	2450
	11th to 20th	Day	50% 9% 13% 20% 8% 1	2444
	21st to end	Day	58% 9% 13% 14% 5%	2592
August	1st to 10th	Day	52% 9% 14% 20% 5%	2481
	11th to 20th	Day	55% 8% 13% 19% 4 1	2304
	21st to end	Day	51% 9% 14% 20% 6%	2378
September	1st to 10th	Day	49% 7% 14% 21% 9% 1	2160
	11th to 20th	Day	57% 5% 10% 20% 7%	2160
	21st to end	Day	51% 8% 10% 21% 9% 1	1917
October	1st to 10th	Day	56% 7% 11% 18% 8%	1800
	11th to 20th	Day	64% 7% 12% 13% 4	1800
	21st to end	Day	70% 6% 9% 11% 3	1828
November	1st to 10th	Day	73% 6% 9% 10% 2	1632
	11th to 20th	Day	79% 5% 7% 8% 2	1520
	21st to end	Day	81% 5% 9% 3 1	1520
December	1st to 10th	Day	85% 7% 5% 2 1	1520
	11th to 20th	Day	89% 4 4 3	1905
	21st to end	Day	83% 7% 6% 2 1	2783
January	1st to 10th	Night	88% 6% 3 3	2649
	11th to 20th	Night	86% 6% 3 3 1	2601
	21st to end	Night	80% 6% 5% 7% 2	2725
February	1st to 10th	Night	79% 5% 7% 7% 2	2340
	11th to 20th	Night	77% 6% 7% 8% 2	2276
	21st to end	Night	67% 9% 9% 9% 6% 1	1796
March	1st to 10th	Night	65% 6% 9% 13% 6% 1	2156
	11th to 20th	Night	63% 6% 8% 16% 7%	1980
	21st to end	Night	66% 5% 8% 12% 7% 2	2066
April	1st to 10th	Night	65% 7% 10% 10% 8%	1800
	11th to 20th	Night	56% 7% 8% 17% 11% 1	1776
	21st to end	Night	57% 6% 10% 17% 10% 1	1621
May	1st to 10th	Night	57% 5% 10% 17% 10% 1	1440
	11th to 20th	Night	51% 7% 9% 20% 11% 2	1417
	21st to end	Night	54% 9% 12% 19% 6% 1	1551
June	1st to 10th	Night	64% 7% 10% 14% 5% 1	1440
	11th to 20th	Night	50% 8% 12% 17% 13% 1	1440
	21st to end	Night	59% 9% 11% 13% 7%	1440
July	1st to 10th	Night	49% 10% 18% 18% 5%	1401
	11th to 20th	Night	48% 11% 13% 19% 7% 1	1392
	21st to end	Night	55% 11% 13% 16% 5%	1486
August	1st to 10th	Night	45% 11% 18% 20% 6%	1430
	11th to 20th	Night	52% 10% 16% 18% 5%	1596
	21st to end	Night	45% 10% 18% 22% 6%	1977
September	1st to 10th	Night	48% 9% 14% 20% 9%	1800
	11th to 20th	Night	52% 6% 12% 20% 9% 1	1800
	21st to end	Night	52% 8% 10% 22% 7% 1	2040
October	1st to 10th	Night	54% 8% 12% 18% 8% 1	2160
	11th to 20th	Night	62% 8% 11% 17% 3	2160
	21st to end	Night	71% 6% 8% 12% 4	2528
November	1st to 10th	Night	68% 9% 11% 10% 2	2441
	11th to 20th	Night	75% 7% 8% 8% 2	2660
	21st to end	Night	81% 7% 7% 4 1	2660
December	1st to 10th	Night	83% 7% 6% 3 1	2660
	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	35% 30% 24% 10% 1	356
	21st to end	Day	26% 35% 28% 9% 2	374
February	1st to 10th	Day	34% 34% 22% 8% 1	340
	11th to 20th	Day	39% 33% 19% 8% 1	336
	21st to end	Day	23% 34% 28% 10% 4	280
March	1st to 10th	Day	26% 32% 29% 9% 3 1	340
	11th to 20th	Day	27% 30% 29% 9% 5% 1	420
	21st to end	Day	31% 30% 24% 11% 3 1	462
April	1st to 10th	Day	36% 32% 21% 9% 2	420
	11th to 20th	Day	34% 29% 24% 9% 3	412
	21st to end	Day	29% 26% 29% 12% 3	482
May	1st to 10th	Day	38% 22% 23% 10% 5% 2	603
	11th to 20th	Day	27% 22% 29% 14% 7% 1	624
	21st to end	Day	30% 23% 29% 14% 4	680
June	1st to 10th	Day	37% 20% 22% 16% 5%	630
	11th to 20th	Day	23% 21% 33% 16% 5% 1	630
	21st to end	Day	33% 16% 27% 17% 6% 1	630
July	1st to 10th	Day	24% 17% 32% 21% 6% 1	620
	11th to 20th	Day	22% 17% 31% 21% 8%	618
	21st to end	Day	30% 16% 30% 16% 7%	685
August	1st to 10th	Day	24% 12% 32% 21% 10% 1	614
	11th to 20th	Day	28% 15% 30% 18% 9% 1	439
	21st to end	Day	23% 18% 34% 19% 5%	495
September	1st to 10th	Day	23% 19% 39% 13% 5% 1	450
	11th to 20th	Day	36% 20% 28% 11% 4 1	450
	21st to end	Day	31% 24% 23% 16% 5% 1	365
October	1st to 10th	Day	32% 21% 28% 12% 5% 2	360
	11th to 20th	Day	34% 23% 24% 13% 4 3	360
	21st to end	Day	39% 28% 19% 9% 5% 1	396
November	1st to 10th	Day	39% 28% 20% 10% 2 1	365
	11th to 20th	Day	39% 29% 20% 8% 3 1	370
	21st to end	Day	37% 30% 24% 8% 1	370
December	1st to 10th	Day	41% 27% 22% 7% 2	370
	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% 30% 25% 10% 2	829
	21st to end	Night	30% 30% 24% 13% 2	858
February	1st to 10th	Night	32% 27% 25% 15% 1	720
	11th to 20th	Night	32% 32% 21% 11% 2	703
	21st to end	Night	23% 24% 30% 17% 5%	592
March	1st to 10th	Night	22% 25% 33% 16% 3	720
	11th to 20th	Night	25% 23% 24% 20% 6% 1	720
	21st to end	Night	29% 23% 26% 16% 5% 1	680
April	1st to 10th	Night	31% 24% 22% 19% 4	540
	11th to 20th	Night	28% 21% 24% 22% 4	534
	21st to end	Night	27% 20% 25% 19% 9%	540
May	1st to 10th	Night	31% 16% 25% 18% 8% 1	540
	11th to 20th	Night	26% 14% 25% 24% 9% 1	532
	21st to end	Night	23% 19% 30% 24% 4	583
June	1st to 10th	Night	31% 12% 28% 23% 5%	540
	11th to 20th	Night	24% 14% 28% 26% 7% 1	540
	21st to end	Night	29% 12% 28% 26% 4	540
July	1st to 10th	Night	18% 12% 31% 28% 11%	526
	11th to 20th	Night	21% 11% 30% 31% 8%	522
	21st to end	Night	28% 7% 25% 31% 9%	590
August	1st to 10th	Night	18% 11% 27% 34% 10% 1	538
	11th to 20th	Night	26% 10% 23% 27% 12% 1	532
	21st to end	Night	21% 9% 24% 34% 13%	594
September	1st to 10th	Night	21% 14% 28% 30% 8% 1	540
	11th to 20th	Night	31% 16% 21% 21% 10% 1	540
	21st to end	Night	28% 18% 28% 18% 7% 1	611
October	1st to 10th	Night	29% 18% 21% 23% 8%	720
	11th to 20th	Night	36% 19% 19% 16% 8% 1	720
	21st to end	Night	39% 26% 20% 11% 4	868
November	1st to 10th	Night	38% 25% 22% 12% 3	830
	11th to 20th	Night	39% 24% 21% 11% 4	850
	21st to end	Night	38% 27% 22% 11% 2	850
December	1st to 10th	Night	38% 28% 22% 9% 3	850
	11th to 20th	Night	40% 30% 21% 7% 2	850
	21st to end	Night	37% 29% 23% 8% 2 1	935

Page generated at 2024-01-13 10:37:55. Version ac07

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