Narrowsburg
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Narrowsburg clear sky chart from 2005-11-06 to 2026-08-15.

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% 8% 3 7% 5% 4 5% 4 6% 7% 33%	144193
	Night	17% 9% 3 8% 5% 4 4 4 5% 7% 34%	137677
Transparency	Day	34% 33% 8% 15% 9% 1	147697
	Night	35% 34% 8% 14% 9% 1	142261
Seeing	Day	26% 14% 27% 19% 10% 4	17110
	Night	24% 13% 26% 25% 10% 1	26230

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% 13% 6% 18% 6% 4 5% 3 5% 5% 23%	4661
	11th to 20th	Day	15% 12% 6% 14% 6% 4 4 3 5% 6% 25%	4650
	21st to end	Day	15% 10% 4 8% 5% 5% 5% 3 5% 6% 34%	5678
February	1st to 10th	Day	16% 10% 4 9% 6% 5% 5% 4 7% 6% 28%	1890
	11th to 20th	Day	14% 11% 4 9% 5% 5% 5% 3 5% 7% 31%	1972
	21st to end	Day	18% 11% 4 9% 5% 4 4 3 5% 6% 30%	1730
March	1st to 10th	Day	21% 10% 4 8% 5% 4 4 3 4 4 34%	4576
	11th to 20th	Day	14% 9% 4 7% 6% 3 4 3 5% 6% 38%	5038
	21st to end	Day	18% 9% 2 6% 4 4 5% 4 6% 6% 35%	5953
April	1st to 10th	Day	19% 11% 3 7% 5% 4 3 3 5% 5% 34%	2520
	11th to 20th	Day	18% 9% 2 6% 4 4 4 3 5% 6% 36%	2494
	21st to end	Day	18% 9% 2 8% 5% 5% 3 3 5% 6% 36%	2520
May	1st to 10th	Day	27% 7% 2 6% 4 4 4 4 5% 7% 29%	7887
	11th to 20th	Day	19% 8% 3 7% 4 5% 4 4 5% 6% 34%	8221
	21st to end	Day	23% 7% 2 6% 4 4 6% 5% 7% 8% 29%	9060
June	1st to 10th	Day	15% 6% 2 6% 5% 5% 5% 4 6% 10% 34%	2940
	11th to 20th	Day	16% 7% 3 6% 6% 5% 6% 5% 7% 8% 33%	2940
	21st to end	Day	15% 7% 2 7% 5% 4 5% 5% 6% 9% 36%	2940
July	1st to 10th	Day	12% 6% 3 8% 5% 5% 6% 4 7% 10% 35%	8280
	11th to 20th	Day	9% 6% 2 7% 5% 5% 6% 5% 8% 11% 36%	8280
	21st to end	Day	15% 6% 3 6% 4 4 5% 4 6% 8% 39%	8993
August	1st to 10th	Day	20% 7% 3 7% 5% 5% 5% 4 7% 8% 29%	4439
	11th to 20th	Day	15% 6% 3 6% 4 5% 6% 5% 7% 9% 35%	3947
	21st to end	Day	17% 6% 1 5% 4 4 4 4 7% 10% 40%	4312
September	1st to 10th	Day	15% 6% 2 6% 4 4 4 4 6% 7% 40%	2400
	11th to 20th	Day	13% 6% 2 5% 4 3 4 3 4 8% 47%	2362
	21st to end	Day	19% 6% 2 6% 5% 5% 5% 3 6% 7% 36%	2200
October	1st to 10th	Day	18% 7% 2 7% 4 3 4 4 5% 7% 39%	2005
	11th to 20th	Day	17% 7% 2 7% 4 4 4 3 7% 7% 38%	2000
	21st to end	Day	23% 8% 3 6% 5% 4 4 4 6% 6% 32%	2080
November	1st to 10th	Day	13% 9% 2 5% 4 4 4 4 5% 7% 44%	1851
	11th to 20th	Day	15% 12% 3 7% 5% 5% 4 4 5% 5% 36%	1890
	21st to end	Day	17% 11% 3 7% 6% 3 4 4 5% 7% 32%	1690
December	1st to 10th	Day	17% 10% 5% 12% 6% 5% 5% 4 5% 6% 24%	2680
	11th to 20th	Day	23% 11% 4 7% 4 4 3 3 4 5% 32%	3066
	21st to end	Day	19% 13% 5% 10% 5% 4 4 3 6% 6% 26%	4048
January	1st to 10th	Night	13% 12% 5% 16% 6% 5% 4 4 5% 6% 24%	8234
	11th to 20th	Night	12% 11% 5% 15% 7% 6% 5% 4 5% 6% 25%	8235
	21st to end	Night	14% 8% 3 8% 7% 5% 6% 4 6% 7% 32%	8488
February	1st to 10th	Night	15% 11% 4 7% 5% 5% 5% 4 6% 6% 32%	2730
	11th to 20th	Night	14% 10% 3 9% 5% 5% 5% 4 6% 8% 30%	2532
	21st to end	Night	17% 10% 2 8% 5% 4 4 4 6% 7% 32%	2076
March	1st to 10th	Night	20% 10% 4 6% 4 3 3 4 5% 6% 35%	5484
	11th to 20th	Night	14% 10% 4 7% 5% 4 4 4 5% 6% 38%	5137
	21st to end	Night	17% 10% 3 8% 5% 5% 4 3 4 6% 35%	5220
April	1st to 10th	Night	20% 9% 3 8% 6% 5% 4 3 6% 6% 31%	2100
	11th to 20th	Night	19% 8% 3 6% 4 4 5% 4 4 7% 36%	2075
	21st to end	Night	20% 7% 2 7% 4 3 4 3 4 5% 40%	2100
May	1st to 10th	Night	29% 8% 2 6% 3 4 3 3 5% 7% 30%	5051
	11th to 20th	Night	20% 8% 2 6% 4 4 3 4 5% 8% 35%	4639
	21st to end	Night	22% 9% 3 7% 4 4 5% 3 6% 7% 31%	5114
June	1st to 10th	Night	17% 6% 1 5% 5% 4 4 4 6% 7% 41%	1680
	11th to 20th	Night	16% 6% 3 6% 3 4 4 3 5% 9% 42%	1680
	21st to end	Night	12% 4 1 5% 4 4 6% 4 8% 10% 43%	1680
July	1st to 10th	Night	14% 7% 2 7% 4 4 5% 4 6% 9% 38%	4680
	11th to 20th	Night	12% 7% 2 7% 5% 5% 5% 4 7% 10% 37%	4680
	21st to end	Night	14% 6% 2 5% 4 4 5% 4 6% 7% 43%	5084
August	1st to 10th	Night	22% 7% 3 7% 5% 3 5% 4 5% 8% 31%	2926
	11th to 20th	Night	17% 6% 2 6% 4 4 4 4 5% 7% 40%	3142
	21st to end	Night	14% 4 2 5% 3 4 4 3 6% 8% 47%	3586
September	1st to 10th	Night	16% 6% 1 4 4 4 4 4 5% 7% 45%	2000
	11th to 20th	Night	13% 6% 1 4 3 3 3 2 4 6% 53%	2036
	21st to end	Night	18% 7% 2 6% 4 4 4 3 5% 7% 41%	2200
October	1st to 10th	Night	21% 6% 2 5% 4 4 3 3 4 6% 42%	2390
	11th to 20th	Night	19% 7% 2 5% 3 3 3 3 4 7% 43%	2400
	21st to end	Night	21% 8% 3 5% 3 3 4 3 5% 8% 36%	2758
November	1st to 10th	Night	14% 7% 2 6% 3 4 4 3 6% 5% 45%	2667
	11th to 20th	Night	18% 8% 2 7% 4 4 4 4 6% 7% 38%	2730
	21st to end	Night	15% 11% 3 7% 5% 5% 4 4 6% 7% 36%	2925
December	1st to 10th	Night	17% 11% 4 9% 4 5% 5% 3 6% 7% 30%	4720
	11th to 20th	Night	25% 10% 3 6% 4 3 4 3 4 5% 33%	5348
	21st to end	Night	21% 14% 5% 8% 5% 4 4 3 5% 6% 25%	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	53% 20% 7% 14% 5% 1	4662
	11th to 20th	Day	49% 22% 5% 13% 10% 2	4680
	21st to end	Day	41% 22% 8% 17% 11%	5678
February	1st to 10th	Day	22% 60% 4 9% 5%	1890
	11th to 20th	Day	24% 58% 2 10% 6%	1981
	21st to end	Day	21% 59% 5% 10% 5% 1	1730
March	1st to 10th	Day	43% 28% 6% 11% 9% 4	4579
	11th to 20th	Day	34% 27% 11% 21% 4 3	5038
	21st to end	Day	37% 28% 6% 7% 18% 4	5953
April	1st to 10th	Day	25% 58% 3 8% 5% 1	2520
	11th to 20th	Day	19% 60% 5% 9% 7%	2494
	21st to end	Day	22% 59% 3 9% 6% 1	2520
May	1st to 10th	Day	45% 23% 10% 14% 8% 1	7899
	11th to 20th	Day	42% 22% 9% 18% 9%	8225
	21st to end	Day	45% 22% 9% 15% 8%	9061
June	1st to 10th	Day	18% 60% 4 10% 7%	2940
	11th to 20th	Day	19% 59% 6% 9% 7%	2940
	21st to end	Day	19% 58% 4 12% 7%	2940
July	1st to 10th	Day	38% 22% 11% 17% 11%	8210
	11th to 20th	Day	35% 20% 12% 24% 9%	8205
	21st to end	Day	36% 20% 8% 21% 14%	8795
August	1st to 10th	Day	38% 35% 9% 12% 5%	4425
	11th to 20th	Day	29% 37% 11% 19% 4	3984
	21st to end	Day	24% 36% 7% 26% 7%	4312
September	1st to 10th	Day	17% 58% 5% 12% 8%	2400
	11th to 20th	Day	16% 57% 4 11% 11% 1	2362
	21st to end	Day	21% 57% 6% 9% 6% 1	2200
October	1st to 10th	Day	27% 36% 3 16% 16% 2	3265
	11th to 20th	Day	24% 36% 5% 18% 13% 4	3240
	21st to end	Day	16% 36% 12% 23% 11% 2	3344
November	1st to 10th	Day	22% 53% 6% 12% 6% 1	1851
	11th to 20th	Day	20% 54% 3 12% 9% 2	1890
	21st to end	Day	24% 54% 7% 11% 3 1	1690
December	1st to 10th	Day	43% 35% 7% 11% 4 1	2680
	11th to 20th	Day	41% 31% 8% 12% 9% 1	3066
	21st to end	Day	47% 25% 5% 13% 10% 1	4048
January	1st to 10th	Night	52% 20% 7% 13% 6% 1	8234
	11th to 20th	Night	50% 21% 7% 11% 8% 2	8280
	21st to end	Night	42% 22% 6% 15% 13% 2	8488
February	1st to 10th	Night	20% 59% 6% 10% 4 1	2730
	11th to 20th	Night	23% 58% 3 9% 6% 1	2534
	21st to end	Night	20% 58% 4 10% 5% 1	2076
March	1st to 10th	Night	38% 28% 8% 12% 12% 2	5494
	11th to 20th	Night	35% 27% 12% 16% 6% 3	5138
	21st to end	Night	40% 29% 3 12% 14% 2	5220
April	1st to 10th	Night	25% 58% 3 8% 5%	2100
	11th to 20th	Night	20% 59% 5% 8% 8%	2075
	21st to end	Night	20% 59% 3 10% 7% 1	2100
May	1st to 10th	Night	45% 22% 11% 13% 8% 1	5057
	11th to 20th	Night	40% 23% 11% 18% 7%	4640
	21st to end	Night	46% 22% 8% 16% 7%	5115
June	1st to 10th	Night	17% 59% 2 13% 9%	1680
	11th to 20th	Night	18% 59% 7% 10% 6%	1680
	21st to end	Night	17% 58% 6% 11% 7% 1	1680
July	1st to 10th	Night	37% 22% 14% 15% 12% 1	4640
	11th to 20th	Night	37% 20% 11% 21% 10% 1	4632
	21st to end	Night	33% 20% 9% 25% 12%	4967
August	1st to 10th	Night	39% 36% 8% 12% 4 1	2916
	11th to 20th	Night	29% 36% 9% 20% 6%	3170
	21st to end	Night	21% 36% 7% 28% 7%	3586
September	1st to 10th	Night	15% 57% 6% 13% 8% 1	2000
	11th to 20th	Night	14% 56% 5% 12% 12% 1	2036
	21st to end	Night	21% 56% 4 11% 7% 1	2200
October	1st to 10th	Night	30% 37% 5% 16% 12% 1	3910
	11th to 20th	Night	20% 35% 7% 16% 18% 3	3899
	21st to end	Night	20% 35% 11% 22% 11%	4444
November	1st to 10th	Night	21% 53% 5% 11% 8% 1	2667
	11th to 20th	Night	20% 55% 4 11% 9% 1	2730
	21st to end	Night	23% 54% 7% 11% 4	2925
December	1st to 10th	Night	37% 35% 8% 18% 2	4720
	11th to 20th	Night	40% 30% 7% 12% 10% 1	5348
	21st to end	Night	47% 26% 6% 11% 9% 1	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	32% 23% 30% 11% 3	220
	11th to 20th	Day	45% 23% 21% 9% 2	220
	21st to end	Day	33% 25% 29% 8% 3 1	344
February	1st to 10th	Day	35% 25% 30% 9% 2	330
	11th to 20th	Day	39% 23% 28% 8% 1	460
	21st to end	Day	33% 20% 31% 13% 2	446
March	1st to 10th	Day	34% 19% 27% 16% 3	540
	11th to 20th	Day	35% 21% 26% 12% 4 1	540
	21st to end	Day	32% 25% 27% 10% 4 2	594
April	1st to 10th	Day	37% 18% 26% 14% 4 1	540
	11th to 20th	Day	33% 18% 26% 11% 9% 2	532
	21st to end	Day	31% 15% 33% 14% 5% 2	540
May	1st to 10th	Day	35% 17% 25% 14% 8% 2	543
	11th to 20th	Day	24% 16% 27% 21% 9% 3	567
	21st to end	Day	24% 10% 28% 21% 12% 4	617
June	1st to 10th	Day	21% 11% 29% 24% 12% 4	570
	11th to 20th	Day	25% 11% 23% 24% 14% 3	570
	21st to end	Day	19% 10% 31% 25% 11% 4	570
July	1st to 10th	Day	14% 5% 27% 31% 17% 7%	565
	11th to 20th	Day	14% 5% 26% 30% 21% 5%	564
	21st to end	Day	18% 7% 30% 28% 13% 5%	620
August	1st to 10th	Day	15% 7% 23% 26% 21% 8%	566
	11th to 20th	Day	17% 6% 22% 27% 20% 8%	535
	21st to end	Day	16% 7% 28% 26% 15% 9%	583
September	1st to 10th	Day	20% 9% 23% 21% 18% 9%	530
	11th to 20th	Day	14% 7% 22% 24% 19% 14%	530
	21st to end	Day	24% 8% 26% 23% 15% 5%	530
October	1st to 10th	Day	26% 8% 23% 19% 18% 6%	530
	11th to 20th	Day	23% 16% 27% 22% 9% 2	530
	21st to end	Day	31% 13% 24% 21% 8% 2	517
November	1st to 10th	Day	24% 16% 25% 22% 12% 3	425
	11th to 20th	Day	30% 19% 23% 20% 6% 1	430
	21st to end	Day	36% 17% 31% 11% 4	230
December	1st to 10th	Day	33% 22% 28% 11% 6%	220
	11th to 20th	Day	40% 19% 26% 11% 4	220
	21st to end	Day	31% 20% 26% 16% 6%	242
January	1st to 10th	Night	27% 22% 31% 17% 3	840
	11th to 20th	Night	31% 18% 27% 21% 3	840
	21st to end	Night	23% 22% 35% 17% 2	924
February	1st to 10th	Night	27% 18% 33% 20% 2	840
	11th to 20th	Night	30% 22% 31% 16% 1	823
	21st to end	Night	30% 20% 30% 16% 3	692
March	1st to 10th	Night	28% 18% 33% 17% 3	840
	11th to 20th	Night	28% 20% 28% 20% 4	840
	21st to end	Night	26% 19% 32% 17% 5%	924
April	1st to 10th	Night	30% 17% 30% 20% 4	840
	11th to 20th	Night	27% 14% 30% 22% 7%	831
	21st to end	Night	26% 15% 28% 24% 7%	840
May	1st to 10th	Night	32% 10% 27% 23% 7% 1	564
	11th to 20th	Night	21% 10% 29% 29% 10%	414
	21st to end	Night	20% 5% 23% 36% 16%	455
June	1st to 10th	Night	19% 5% 23% 36% 16% 1	420
	11th to 20th	Night	20% 5% 25% 33% 17%	420
	21st to end	Night	13% 3 25% 41% 16%	420
July	1st to 10th	Night	17% 3 14% 41% 23% 2	410
	11th to 20th	Night	13% 3 18% 45% 20% 2	408
	21st to end	Night	14% 4 18% 43% 21% 1	460
August	1st to 10th	Night	15% 1 16% 38% 27% 3	574
	11th to 20th	Night	16% 3 13% 39% 25% 3	747
	21st to end	Night	16% 4 17% 36% 25% 2	880
September	1st to 10th	Night	18% 4 22% 32% 22% 2	800
	11th to 20th	Night	17% 3 19% 32% 24% 5%	800
	21st to end	Night	21% 6% 21% 32% 18% 3	800
October	1st to 10th	Night	25% 8% 20% 26% 19% 3	800
	11th to 20th	Night	26% 9% 26% 29% 9% 1	800
	21st to end	Night	28% 13% 27% 25% 7%	880
November	1st to 10th	Night	21% 13% 29% 26% 10% 1	820
	11th to 20th	Night	27% 17% 25% 23% 7% 1	840
	21st to end	Night	23% 18% 29% 23% 6% 1	840
December	1st to 10th	Night	30% 18% 28% 19% 5%	840
	11th to 20th	Night	29% 20% 27% 21% 3	840
	21st to end	Night	31% 17% 31% 18% 3	924

Page generated at 2026-08-12 03:37:17. Version ac07

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