Stroudsburg
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Stroudsburg clear sky chart from 2005-11-06 to 2025-07-21.

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% 7% 3 6% 4 4 4 4 5% 7% 38%	120211
	Night	18% 7% 2 6% 4 4 4 3 5% 6% 41%	118901
Transparency	Day	44% 6% 13% 22% 14% 2	123771
	Night	42% 5% 12% 22% 15% 3	123502
Seeing	Day	22% 14% 27% 23% 11% 4	15780
	Night	20% 10% 29% 30% 10% 1	24990

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% 8% 4 8% 4 4 4 3 4 5% 43%	3597
	11th to 20th	Day	13% 11% 4 12% 5% 5% 5% 3 5% 5% 33%	3570
	21st to end	Day	16% 9% 3 8% 5% 4 4 3 4 5% 38%	4466
February	1st to 10th	Day	15% 8% 3 8% 5% 5% 5% 4 6% 5% 36%	1800
	11th to 20th	Day	14% 9% 3 8% 5% 5% 4 4 5% 6% 38%	1882
	21st to end	Day	19% 10% 4 6% 6% 4 4 3 4 5% 37%	1650
March	1st to 10th	Day	21% 8% 3 5% 4 4 3 3 4 5% 40%	4476
	11th to 20th	Day	13% 7% 3 7% 4 4 4 4 5% 7% 43%	4969
	21st to end	Day	17% 7% 2 6% 4 3 4 4 5% 6% 42%	5804
April	1st to 10th	Day	18% 9% 3 7% 5% 5% 4 3 6% 6% 36%	2400
	11th to 20th	Day	17% 9% 2 7% 4 4 4 3 5% 6% 39%	2374
	21st to end	Day	17% 6% 2 6% 5% 5% 4 4 6% 6% 40%	2400
May	1st to 10th	Day	28% 7% 2 6% 4 4 4 3 5% 7% 29%	5970
	11th to 20th	Day	24% 8% 3 7% 4 4 4 3 5% 6% 32%	6318
	21st to end	Day	21% 6% 2 5% 4 4 5% 4 6% 8% 34%	6949
June	1st to 10th	Day	15% 5% 2 7% 6% 5% 5% 4 6% 8% 37%	2800
	11th to 20th	Day	17% 6% 2 6% 5% 5% 5% 4 6% 9% 35%	2800
	21st to end	Day	13% 6% 2 6% 5% 5% 5% 4 7% 8% 40%	2800
July	1st to 10th	Day	8% 5% 3 7% 6% 6% 6% 5% 6% 10% 38%	4580
	11th to 20th	Day	10% 6% 2 6% 5% 5% 5% 5% 7% 10% 39%	4580
	21st to end	Day	15% 8% 3 7% 5% 5% 5% 4 6% 7% 33%	4814
August	1st to 10th	Day	22% 5% 2 7% 5% 5% 5% 5% 7% 7% 31%	4109
	11th to 20th	Day	14% 6% 2 6% 3 5% 6% 4 6% 8% 40%	3768
	21st to end	Day	15% 5% 2 4 4 3 4 3 5% 9% 47%	4180
September	1st to 10th	Day	17% 5% 2 6% 4 4 4 4 5% 7% 43%	2280
	11th to 20th	Day	14% 4 1 4 3 4 4 3 5% 7% 49%	2249
	21st to end	Day	20% 6% 2 6% 4 4 4 4 5% 5% 39%	2090
October	1st to 10th	Day	20% 6% 3 6% 4 3 4 3 4 8% 41%	1900
	11th to 20th	Day	16% 6% 2 4 4 4 4 3 4 6% 46%	1900
	21st to end	Day	21% 6% 2 5% 4 4 4 3 4 7% 39%	1999
November	1st to 10th	Day	14% 7% 2 5% 3 3 3 2 4 6% 53%	1761
	11th to 20th	Day	18% 6% 2 6% 4 3 4 4 5% 5% 44%	1800
	21st to end	Day	18% 6% 3 6% 3 4 4 4 6% 6% 40%	1630
December	1st to 10th	Day	17% 8% 3 6% 4 4 4 3 5% 6% 41%	2600
	11th to 20th	Day	23% 8% 2 5% 4 4 3 3 5% 5% 38%	2986
	21st to end	Day	18% 9% 4 9% 6% 4 4 3 5% 6% 32%	3960
January	1st to 10th	Night	14% 7% 3 7% 4 4 4 3 5% 6% 43%	6349
	11th to 20th	Night	13% 9% 3 8% 5% 4 4 4 5% 6% 38%	6298
	21st to end	Night	17% 9% 3 6% 5% 4 4 3 4 5% 40%	6490
February	1st to 10th	Night	16% 8% 2 7% 5% 4 3 3 5% 7% 39%	2600
	11th to 20th	Night	15% 8% 3 7% 5% 4 3 4 5% 6% 39%	2402
	21st to end	Night	19% 7% 2 6% 5% 4 4 3 6% 5% 40%	1980
March	1st to 10th	Night	18% 9% 3 7% 4 3 4 3 5% 4 41%	5364
	11th to 20th	Night	13% 7% 3 5% 3 4 4 3 4 6% 48%	4988
	21st to end	Night	16% 9% 3 7% 4 3 4 3 4 4 42%	5128
April	1st to 10th	Night	18% 8% 3 7% 5% 4 4 4 6% 6% 36%	2000
	11th to 20th	Night	19% 6% 2 6% 4 4 4 4 5% 7% 39%	1975
	21st to end	Night	20% 6% 2 5% 3 3 4 3 6% 6% 42%	2000
May	1st to 10th	Night	31% 8% 2 5% 4 4 4 4 5% 6% 28%	4008
	11th to 20th	Night	25% 9% 3 6% 3 3 4 3 5% 5% 33%	3575
	21st to end	Night	23% 6% 2 6% 4 4 3 3 5% 7% 37%	3926
June	1st to 10th	Night	17% 5% 2 5% 4 4 4 4 5% 7% 43%	1600
	11th to 20th	Night	14% 5% 2 4 4 4 4 5% 7% 9% 41%	1600
	21st to end	Night	13% 4 1 5% 3 3 5% 5% 7% 9% 44%	1600
July	1st to 10th	Night	11% 5% 2 7% 4 6% 7% 5% 6% 9% 39%	2600
	11th to 20th	Night	11% 5% 2 6% 5% 4 5% 6% 8% 10% 38%	2600
	21st to end	Night	17% 6% 2 5% 4 5% 4 4 7% 7% 39%	2739
August	1st to 10th	Night	22% 6% 2 6% 4 5% 4 4 6% 8% 33%	2816
	11th to 20th	Night	17% 7% 2 7% 4 4 3 3 5% 6% 42%	3028
	21st to end	Night	14% 4 2 4 3 3 4 3 5% 8% 50%	3476
September	1st to 10th	Night	15% 6% 2 5% 4 3 4 3 5% 7% 46%	1900
	11th to 20th	Night	13% 5% 2 5% 3 3 3 3 4 7% 52%	1929
	21st to end	Night	19% 6% 2 6% 3 3 3 3 4 6% 44%	2090
October	1st to 10th	Night	23% 5% 2 5% 4 3 4 3 3 6% 43%	2276
	11th to 20th	Night	17% 6% 2 5% 4 3 3 3 5% 5% 48%	2280
	21st to end	Night	21% 7% 2 4 3 2 3 3 5% 6% 44%	2598
November	1st to 10th	Night	13% 5% 2 4 3 4 4 4 5% 5% 51%	2537
	11th to 20th	Night	18% 7% 2 4 3 3 3 4 4 6% 45%	2600
	21st to end	Night	15% 6% 3 5% 4 4 4 3 5% 8% 43%	2765
December	1st to 10th	Night	14% 8% 3 7% 4 4 4 3 4 5% 44%	4580
	11th to 20th	Night	24% 8% 2 4 4 3 3 3 4 4 39%	5208
	21st to end	Night	21% 11% 3 7% 4 4 3 3 4 5% 35%	6996

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	41% 5% 11% 25% 16% 2	3598
	11th to 20th	Day	51% 5% 11% 18% 11% 4	3600
	21st to end	Day	48% 5% 11% 22% 13% 1	4466
February	1st to 10th	Day	47% 6% 14% 21% 12% 1	1800
	11th to 20th	Day	46% 5% 10% 22% 14% 2	1891
	21st to end	Day	50% 4 11% 21% 11% 3	1650
March	1st to 10th	Day	46% 4 11% 21% 12% 6%	4479
	11th to 20th	Day	39% 6% 15% 27% 9% 4	4969
	21st to end	Day	42% 5% 12% 13% 22% 5%	5804
April	1st to 10th	Day	48% 5% 10% 19% 13% 4	2400
	11th to 20th	Day	45% 5% 11% 21% 15% 3	2374
	21st to end	Day	42% 6% 11% 21% 15% 4	2400
May	1st to 10th	Day	53% 7% 14% 16% 9% 1	5981
	11th to 20th	Day	52% 6% 9% 20% 11% 1	6322
	21st to end	Day	44% 7% 12% 22% 13% 1	6949
June	1st to 10th	Day	43% 8% 14% 21% 14% 1	2800
	11th to 20th	Day	44% 8% 14% 21% 11% 2	2800
	21st to end	Day	40% 8% 14% 25% 13% 1	2800
July	1st to 10th	Day	40% 9% 14% 21% 14% 2	4510
	11th to 20th	Day	38% 8% 18% 23% 12% 1	4505
	21st to end	Day	48% 7% 11% 17% 15% 1	4661
August	1st to 10th	Day	50% 7% 15% 19% 10%	4095
	11th to 20th	Day	40% 7% 13% 29% 11% 1	3805
	21st to end	Day	35% 5% 12% 31% 15% 2	4180
September	1st to 10th	Day	41% 6% 11% 21% 18% 2	2280
	11th to 20th	Day	34% 4 12% 22% 25% 3	2249
	21st to end	Day	46% 5% 9% 18% 19% 2	2090
October	1st to 10th	Day	40% 5% 9% 19% 22% 4	3160
	11th to 20th	Day	30% 5% 10% 28% 23% 4	3140
	21st to end	Day	29% 4 15% 26% 22% 3	3276
November	1st to 10th	Day	36% 4 13% 24% 20% 3	1761
	11th to 20th	Day	40% 4 12% 24% 17% 2	1800
	21st to end	Day	42% 5% 15% 26% 10% 2	1630
December	1st to 10th	Day	45% 4 16% 25% 10% 1	2600
	11th to 20th	Day	47% 4 16% 21% 11% 1	2986
	21st to end	Day	49% 6% 13% 18% 13% 1	3960
January	1st to 10th	Night	40% 4 12% 22% 18% 3	6349
	11th to 20th	Night	43% 6% 15% 19% 12% 5%	6343
	21st to end	Night	45% 5% 12% 18% 17% 3	6490
February	1st to 10th	Night	45% 6% 13% 24% 11% 2	2600
	11th to 20th	Night	45% 6% 10% 20% 15% 4	2404
	21st to end	Night	45% 5% 9% 23% 15% 3	1980
March	1st to 10th	Night	45% 4 12% 21% 11% 7%	5374
	11th to 20th	Night	38% 4 16% 25% 12% 4	4989
	21st to end	Night	45% 5% 7% 15% 23% 5%	5128
April	1st to 10th	Night	48% 6% 10% 20% 13% 3	2000
	11th to 20th	Night	43% 7% 10% 19% 19% 1	1975
	21st to end	Night	40% 5% 11% 22% 17% 4	2000
May	1st to 10th	Night	56% 7% 11% 16% 9% 2	4014
	11th to 20th	Night	53% 7% 11% 15% 13% 2	3576
	21st to end	Night	45% 7% 13% 22% 11% 2	3927
June	1st to 10th	Night	41% 6% 10% 24% 18% 1	1600
	11th to 20th	Night	37% 9% 16% 24% 13% 1	1600
	21st to end	Night	33% 9% 15% 28% 14% 1	1600
July	1st to 10th	Night	41% 10% 15% 17% 16% 2	2560
	11th to 20th	Night	38% 10% 15% 24% 12% 1	2552
	21st to end	Night	42% 7% 15% 16% 18% 1	2651
August	1st to 10th	Night	48% 9% 16% 17% 9% 1	2806
	11th to 20th	Night	43% 6% 14% 23% 14% 1	3057
	21st to end	Night	33% 6% 11% 32% 17% 1	3476
September	1st to 10th	Night	39% 5% 11% 24% 19% 2	1900
	11th to 20th	Night	33% 6% 10% 22% 26% 3	1929
	21st to end	Night	41% 6% 9% 21% 21% 1	2090
October	1st to 10th	Night	42% 5% 10% 22% 19% 1	3796
	11th to 20th	Night	29% 4 9% 28% 25% 4	3779
	21st to end	Night	30% 4 14% 30% 21% 2	4271
November	1st to 10th	Night	34% 6% 13% 24% 20% 3	2537
	11th to 20th	Night	41% 4 11% 23% 18% 3	2600
	21st to end	Night	40% 5% 14% 27% 13% 1	2765
December	1st to 10th	Night	43% 4 14% 30% 8% 1	4580
	11th to 20th	Night	47% 4 12% 21% 14% 2	5208
	21st to end	Night	50% 4 12% 18% 13% 2	6996

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	29% 25% 26% 17% 4	200
	11th to 20th	Day	29% 26% 30% 13% 3 1	200
	21st to end	Day	21% 28% 32% 14% 5% 1	330
February	1st to 10th	Day	25% 27% 35% 10% 2	300
	11th to 20th	Day	28% 21% 37% 13% 2	430
	21st to end	Day	27% 20% 31% 19% 3	414
March	1st to 10th	Day	26% 22% 27% 21% 4	500
	11th to 20th	Day	24% 21% 34% 18% 4 1	500
	21st to end	Day	28% 21% 27% 17% 5% 2	550
April	1st to 10th	Day	26% 22% 28% 17% 6% 1	500
	11th to 20th	Day	26% 20% 28% 16% 10% 1	492
	21st to end	Day	25% 17% 32% 18% 6% 2	500
May	1st to 10th	Day	30% 20% 22% 16% 9% 3	503
	11th to 20th	Day	24% 13% 29% 21% 9% 3	527
	21st to end	Day	21% 9% 25% 24% 18% 3	573
June	1st to 10th	Day	19% 14% 25% 25% 14% 3	530
	11th to 20th	Day	22% 10% 26% 27% 13% 3	530
	21st to end	Day	16% 10% 28% 29% 15% 2	530
July	1st to 10th	Day	12% 4 25% 29% 22% 8%	525
	11th to 20th	Day	11% 5% 23% 31% 23% 6%	524
	21st to end	Day	16% 7% 27% 30% 16% 4	532
August	1st to 10th	Day	16% 5% 20% 32% 20% 7%	486
	11th to 20th	Day	14% 4 20% 34% 20% 8%	479
	21st to end	Day	14% 6% 24% 28% 18% 10%	539
September	1st to 10th	Day	21% 7% 21% 25% 17% 9%	490
	11th to 20th	Day	14% 5% 24% 27% 17% 13%	490
	21st to end	Day	25% 9% 23% 24% 14% 5%	490
October	1st to 10th	Day	25% 8% 23% 22% 16% 6%	490
	11th to 20th	Day	19% 13% 29% 26% 10% 3	490
	21st to end	Day	23% 14% 30% 22% 9% 1	491
November	1st to 10th	Day	20% 13% 27% 26% 11% 3	395
	11th to 20th	Day	23% 18% 30% 24% 6% 1	400
	21st to end	Day	25% 20% 32% 19% 4	230
December	1st to 10th	Day	25% 24% 32% 14% 6% 1	200
	11th to 20th	Day	34% 20% 25% 18% 4	200
	21st to end	Day	25% 17% 34% 17% 5% 1	220
January	1st to 10th	Night	21% 14% 40% 22% 3	800
	11th to 20th	Night	24% 15% 33% 26% 3	800
	21st to end	Night	18% 14% 42% 25% 2	880
February	1st to 10th	Night	22% 11% 39% 27% 2	800
	11th to 20th	Night	22% 18% 40% 19% 1	783
	21st to end	Night	23% 15% 37% 22% 3	660
March	1st to 10th	Night	22% 14% 36% 24% 4	800
	11th to 20th	Night	20% 15% 36% 24% 5%	800
	21st to end	Night	20% 14% 38% 22% 6%	880
April	1st to 10th	Night	22% 14% 38% 22% 4	800
	11th to 20th	Night	21% 13% 34% 24% 8%	791
	21st to end	Night	24% 10% 29% 31% 7%	800
May	1st to 10th	Night	27% 9% 28% 28% 8% 1	580
	11th to 20th	Night	20% 9% 32% 33% 7%	394
	21st to end	Night	19% 4 21% 39% 17%	433
June	1st to 10th	Night	18% 5% 21% 37% 19% 1	400
	11th to 20th	Night	15% 4 26% 39% 17%	400
	21st to end	Night	15% 3 18% 49% 17%	400
July	1st to 10th	Night	14% 3 19% 41% 22% 2	390
	11th to 20th	Night	11% 5% 14% 46% 22% 2	388
	21st to end	Night	14% 4 16% 44% 20% 1	416
August	1st to 10th	Night	13% 2 11% 44% 27% 3	558
	11th to 20th	Night	15% 3 15% 38% 27% 2	705
	21st to end	Night	17% 3 15% 38% 26% 1	836
September	1st to 10th	Night	19% 3 20% 35% 21% 2	760
	11th to 20th	Night	14% 5% 18% 35% 24% 5%	760
	21st to end	Night	22% 4 21% 32% 19% 1	760
October	1st to 10th	Night	24% 5% 23% 27% 19% 2	760
	11th to 20th	Night	19% 8% 28% 35% 10%	760
	21st to end	Night	25% 7% 32% 27% 9%	836
November	1st to 10th	Night	17% 8% 32% 33% 10% 1	780
	11th to 20th	Night	22% 13% 30% 27% 8% 1	800
	21st to end	Night	19% 13% 34% 27% 7%	800
December	1st to 10th	Night	24% 11% 34% 26% 6% 1	800
	11th to 20th	Night	24% 12% 32% 28% 4	800
	21st to end	Night	23% 12% 36% 26% 2	880

Page generated at 2025-07-18 01:09:59. Version ac07

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