Lake Wallenpaupack
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lake Wallenpaupack clear sky chart from 2005-11-06 to 2026-09-14.

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	15% 8% 3 8% 5% 5% 5% 4 6% 8% 34%	149421
	Night	15% 8% 3 8% 5% 4 4 4 5% 7% 36%	141693
Transparency	Day	46% 6% 12% 22% 13% 2	152925
	Night	45% 6% 12% 22% 13% 2	146277
Seeing	Day	25% 17% 29% 18% 8% 3	17241
	Night	23% 18% 29% 21% 8% 1	26384

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	11% 13% 6% 14% 8% 6% 5% 3 4 5% 26%	4661
	11th to 20th	Day	12% 13% 5% 13% 5% 5% 5% 3 4 6% 30%	4650
	21st to end	Day	14% 9% 4 9% 5% 5% 4 4 5% 6% 35%	5736
February	1st to 10th	Day	14% 10% 4 8% 6% 5% 5% 4 6% 6% 32%	1890
	11th to 20th	Day	12% 11% 5% 8% 6% 6% 4 3 6% 6% 33%	1966
	21st to end	Day	16% 12% 3 8% 6% 5% 3 3 5% 6% 32%	1730
March	1st to 10th	Day	19% 9% 3 7% 5% 5% 4 3 5% 5% 35%	4576
	11th to 20th	Day	11% 9% 3 7% 5% 4 5% 4 6% 7% 39%	5077
	21st to end	Day	16% 8% 3 6% 5% 5% 5% 4 6% 7% 36%	5932
April	1st to 10th	Day	16% 12% 3 7% 5% 5% 4 4 5% 6% 34%	2520
	11th to 20th	Day	14% 11% 2 7% 4 4 4 4 5% 7% 37%	2494
	21st to end	Day	17% 7% 2 8% 5% 5% 4 4 5% 6% 36%	2520
May	1st to 10th	Day	23% 8% 2 7% 4 4 5% 4 5% 7% 30%	7851
	11th to 20th	Day	18% 9% 2 6% 5% 4 5% 4 5% 7% 35%	8221
	21st to end	Day	21% 8% 3 6% 4 5% 5% 4 6% 8% 29%	9060
June	1st to 10th	Day	14% 6% 2 6% 5% 6% 5% 5% 6% 8% 35%	2940
	11th to 20th	Day	14% 7% 3 7% 6% 6% 5% 5% 5% 8% 34%	2940
	21st to end	Day	12% 6% 3 7% 5% 6% 4 5% 6% 10% 36%	2940
July	1st to 10th	Day	11% 5% 2 8% 6% 6% 6% 5% 7% 9% 36%	8280
	11th to 20th	Day	8% 6% 2 7% 5% 5% 6% 5% 8% 11% 36%	8280
	21st to end	Day	13% 7% 3 7% 5% 5% 5% 4 6% 8% 39%	8993
August	1st to 10th	Day	16% 6% 3 8% 6% 6% 6% 5% 8% 9% 27%	6066
	11th to 20th	Day	11% 7% 3 7% 4 5% 6% 5% 6% 9% 38%	5579
	21st to end	Day	12% 6% 3 6% 4 4 5% 4 7% 10% 39%	6080
September	1st to 10th	Day	15% 5% 2 6% 6% 5% 5% 4 5% 8% 40%	2520
	11th to 20th	Day	13% 5% 2 5% 4 4 4 3 6% 8% 46%	2406
	21st to end	Day	17% 7% 2 7% 4 4 5% 4 5% 7% 37%	2195
October	1st to 10th	Day	16% 7% 3 6% 5% 4 4 3 5% 6% 41%	2000
	11th to 20th	Day	14% 8% 3 7% 5% 4 5% 3 6% 8% 39%	2000
	21st to end	Day	18% 9% 2 7% 5% 4 5% 3 5% 7% 34%	2095
November	1st to 10th	Day	12% 9% 2 6% 4 4 4 3 5% 6% 45%	1851
	11th to 20th	Day	14% 9% 3 7% 5% 5% 4 4 6% 7% 37%	1890
	21st to end	Day	17% 8% 4 8% 5% 4 5% 4 6% 7% 32%	1688
December	1st to 10th	Day	13% 9% 4 11% 6% 5% 6% 4 6% 6% 31%	2680
	11th to 20th	Day	18% 11% 4 8% 5% 4 3 3 5% 5% 33%	3066
	21st to end	Day	14% 11% 6% 12% 6% 5% 5% 4 5% 6% 26%	4048
January	1st to 10th	Night	10% 10% 5% 14% 8% 6% 5% 4 5% 6% 26%	8234
	11th to 20th	Night	11% 11% 5% 15% 6% 5% 5% 4 5% 6% 28%	8235
	21st to end	Night	13% 9% 3 7% 6% 5% 5% 4 6% 7% 35%	8443
February	1st to 10th	Night	14% 10% 4 7% 5% 4 5% 3 5% 7% 35%	2730
	11th to 20th	Night	13% 9% 4 9% 6% 5% 5% 5% 7% 7% 30%	2538
	21st to end	Night	15% 10% 3 8% 6% 4 5% 3 5% 6% 34%	2076
March	1st to 10th	Night	16% 10% 4 7% 5% 3 4 3 5% 5% 36%	5484
	11th to 20th	Night	10% 8% 4 7% 5% 4 4 4 6% 8% 40%	5099
	21st to end	Night	14% 9% 3 9% 5% 4 4 4 6% 6% 36%	5242
April	1st to 10th	Night	16% 9% 3 9% 5% 5% 5% 4 5% 7% 31%	2100
	11th to 20th	Night	17% 8% 2 6% 4 5% 5% 4 6% 7% 36%	2075
	21st to end	Night	18% 8% 3 6% 4 5% 4 3 5% 6% 39%	2100
May	1st to 10th	Night	26% 9% 3 5% 4 4 4 4 5% 7% 30%	5104
	11th to 20th	Night	19% 9% 2 6% 3 4 3 3 5% 8% 37%	4639
	21st to end	Night	20% 9% 3 7% 4 5% 4 3 5% 8% 32%	5114
June	1st to 10th	Night	16% 6% 2 5% 4 4 4 4 5% 8% 42%	1680
	11th to 20th	Night	13% 6% 2 7% 4 4 5% 4 6% 9% 41%	1680
	21st to end	Night	11% 4 1 5% 3 4 5% 4 8% 10% 45%	1680
July	1st to 10th	Night	13% 6% 2 7% 4 4 5% 4 6% 9% 40%	4680
	11th to 20th	Night	8% 6% 2 7% 5% 5% 5% 5% 8% 10% 38%	4680
	21st to end	Night	12% 6% 2 5% 4 4 4 4 6% 7% 45%	5084
August	1st to 10th	Night	16% 7% 3 8% 5% 5% 5% 4 6% 9% 32%	4080
	11th to 20th	Night	14% 6% 3 7% 4 4 5% 4 6% 7% 41%	4418
	21st to end	Night	11% 6% 2 6% 4 4 4 3 6% 8% 47%	5045
September	1st to 10th	Night	14% 6% 3 5% 4 4 4 3 5% 7% 46%	2100
	11th to 20th	Night	12% 6% 1 4 4 3 4 3 4 7% 52%	2061
	21st to end	Night	15% 8% 2 6% 5% 4 4 4 5% 6% 41%	2202
October	1st to 10th	Night	18% 7% 2 5% 4 3 3 3 4 6% 44%	2400
	11th to 20th	Night	16% 7% 2 5% 3 3 4 3 5% 6% 44%	2400
	21st to end	Night	19% 8% 2 4 3 3 4 3 6% 7% 39%	2745
November	1st to 10th	Night	12% 7% 2 6% 5% 4 4 4 4 7% 46%	2667
	11th to 20th	Night	16% 8% 3 6% 4 5% 4 3 5% 6% 40%	2730
	21st to end	Night	13% 9% 4 6% 5% 5% 4 4 6% 8% 37%	2930
December	1st to 10th	Night	13% 9% 4 9% 4 5% 4 4 6% 8% 35%	4720
	11th to 20th	Night	19% 11% 3 7% 4 4 4 3 4 5% 34%	5348
	21st to end	Night	17% 13% 5% 10% 5% 5% 4 3 5% 6% 28%	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	55% 7% 10% 20% 7% 1	4662
	11th to 20th	Day	54% 4 9% 18% 12% 4	4680
	21st to end	Day	47% 5% 11% 23% 14% 1	5736
February	1st to 10th	Day	52% 4 11% 19% 12% 1	1890
	11th to 20th	Day	51% 4 9% 22% 12% 1	1975
	21st to end	Day	53% 3 10% 22% 10% 2	1730
March	1st to 10th	Day	51% 4 10% 18% 12% 6%	4579
	11th to 20th	Day	41% 7% 13% 27% 8% 4	5077
	21st to end	Day	46% 6% 10% 12% 22% 4	5932
April	1st to 10th	Day	50% 4 9% 21% 13% 3	2520
	11th to 20th	Day	46% 5% 12% 21% 14% 2	2494
	21st to end	Day	47% 5% 8% 22% 14% 3	2520
May	1st to 10th	Day	52% 6% 12% 19% 10% 1	7862
	11th to 20th	Day	48% 6% 11% 23% 11% 1	8225
	21st to end	Day	50% 7% 13% 19% 11% 1	9061
June	1st to 10th	Day	44% 7% 12% 22% 15% 1	2940
	11th to 20th	Day	46% 7% 13% 21% 11% 1	2940
	21st to end	Day	42% 7% 13% 26% 11% 1	2940
July	1st to 10th	Day	44% 8% 13% 22% 13%	8210
	11th to 20th	Day	38% 8% 15% 27% 11%	8205
	21st to end	Day	42% 6% 11% 23% 17% 1	8795
August	1st to 10th	Day	52% 8% 13% 17% 10% 1	6052
	11th to 20th	Day	40% 7% 18% 28% 7%	5617
	21st to end	Day	38% 6% 13% 30% 11% 1	6080
September	1st to 10th	Day	42% 4 13% 23% 17% 1	2520
	11th to 20th	Day	36% 4 11% 25% 22% 2	2406
	21st to end	Day	46% 5% 11% 19% 16% 2	2195
October	1st to 10th	Day	43% 5% 9% 22% 20% 2	3260
	11th to 20th	Day	37% 4 9% 27% 17% 6%	3240
	21st to end	Day	33% 4 16% 27% 17% 3	3359
November	1st to 10th	Day	39% 4 12% 25% 17% 3	1851
	11th to 20th	Day	45% 6% 9% 24% 14% 3	1890
	21st to end	Day	49% 5% 13% 23% 8% 1	1688
December	1st to 10th	Day	51% 5% 15% 21% 8% 1	2680
	11th to 20th	Day	51% 5% 13% 19% 11% 1	3066
	21st to end	Day	56% 6% 10% 16% 11% 1	4048
January	1st to 10th	Night	54% 6% 10% 19% 8% 1	8234
	11th to 20th	Night	54% 5% 11% 16% 10% 3	8280
	21st to end	Night	45% 6% 10% 20% 17% 2	8443
February	1st to 10th	Night	47% 5% 13% 23% 11% 1	2730
	11th to 20th	Night	50% 6% 10% 19% 13% 2	2540
	21st to end	Night	50% 4 9% 22% 12% 3	2076
March	1st to 10th	Night	48% 4 13% 18% 14% 3	5494
	11th to 20th	Night	39% 7% 17% 24% 9% 4	5100
	21st to end	Night	46% 7% 7% 16% 20% 3	5242
April	1st to 10th	Night	52% 5% 10% 18% 12% 2	2100
	11th to 20th	Night	45% 6% 11% 21% 15% 1	2075
	21st to end	Night	45% 6% 9% 22% 15% 3	2100
May	1st to 10th	Night	53% 5% 12% 18% 10% 1	5110
	11th to 20th	Night	46% 7% 14% 22% 11% 1	4640
	21st to end	Night	51% 6% 11% 21% 10% 1	5115
June	1st to 10th	Night	40% 6% 10% 27% 17%	1680
	11th to 20th	Night	40% 6% 17% 26% 11% 1	1680
	21st to end	Night	33% 7% 19% 28% 13% 1	1680
July	1st to 10th	Night	41% 8% 16% 20% 15% 1	4640
	11th to 20th	Night	39% 9% 14% 25% 12%	4632
	21st to end	Night	37% 7% 13% 27% 16% 1	4967
August	1st to 10th	Night	48% 8% 15% 20% 8% 1	4070
	11th to 20th	Night	41% 7% 18% 27% 7%	4446
	21st to end	Night	35% 6% 14% 30% 13% 1	5045
September	1st to 10th	Night	38% 5% 13% 27% 16% 1	2100
	11th to 20th	Night	33% 4 11% 26% 24% 2	2061
	21st to end	Night	43% 5% 10% 22% 18% 1	2202
October	1st to 10th	Night	43% 6% 10% 23% 16% 1	3920
	11th to 20th	Night	33% 5% 11% 25% 21% 5%	3899
	21st to end	Night	32% 5% 16% 28% 18% 1	4431
November	1st to 10th	Night	39% 4 12% 23% 20% 3	2667
	11th to 20th	Night	44% 4 10% 23% 16% 2	2730
	21st to end	Night	44% 5% 15% 25% 11% 1	2930
December	1st to 10th	Night	46% 6% 13% 28% 6%	4720
	11th to 20th	Night	51% 5% 12% 18% 13% 1	5348
	21st to end	Night	56% 6% 10% 16% 11% 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	39% 27% 24% 8% 1	220
	11th to 20th	Day	38% 30% 24% 7% 1	220
	21st to end	Day	34% 26% 28% 7% 3	355
February	1st to 10th	Day	36% 27% 29% 7% 1	330
	11th to 20th	Day	41% 25% 29% 4 1	454
	21st to end	Day	35% 28% 28% 7% 2	446
March	1st to 10th	Day	35% 21% 32% 10% 2	540
	11th to 20th	Day	33% 24% 29% 11% 2 1	540
	21st to end	Day	34% 28% 26% 8% 3 1	594
April	1st to 10th	Day	36% 25% 24% 11% 4	540
	11th to 20th	Day	31% 25% 26% 13% 5% 1	532
	21st to end	Day	28% 22% 34% 10% 4 2	540
May	1st to 10th	Day	34% 18% 29% 12% 5% 2	543
	11th to 20th	Day	23% 18% 34% 17% 7% 2	567
	21st to end	Day	23% 11% 31% 21% 11% 3	617
June	1st to 10th	Day	21% 13% 30% 26% 8% 2	570
	11th to 20th	Day	22% 14% 26% 24% 11% 2	570
	21st to end	Day	17% 13% 33% 27% 9% 2	570
July	1st to 10th	Day	15% 6% 32% 27% 16% 5%	565
	11th to 20th	Day	11% 7% 30% 30% 18% 3	564
	21st to end	Day	13% 9% 35% 29% 10% 4	620
August	1st to 10th	Day	12% 7% 28% 27% 19% 7%	566
	11th to 20th	Day	14% 6% 27% 31% 17% 5%	559
	21st to end	Day	14% 9% 32% 26% 13% 7%	627
September	1st to 10th	Day	19% 12% 26% 22% 14% 7%	570
	11th to 20th	Day	13% 8% 28% 23% 18% 10%	542
	21st to end	Day	22% 11% 32% 20% 13% 3	530
October	1st to 10th	Day	24% 11% 25% 21% 13% 6%	530
	11th to 20th	Day	24% 20% 28% 20% 6% 2	530
	21st to end	Day	28% 19% 29% 18% 6% 1	525
November	1st to 10th	Day	24% 22% 26% 19% 8% 2	425
	11th to 20th	Day	30% 25% 28% 13% 4	430
	21st to end	Day	36% 22% 31% 10% 1	228
December	1st to 10th	Day	32% 29% 28% 7% 4	220
	11th to 20th	Day	41% 24% 26% 5% 3	220
	21st to end	Day	33% 22% 30% 10% 5%	242
January	1st to 10th	Night	26% 29% 32% 11% 2	840
	11th to 20th	Night	29% 25% 30% 13% 2	840
	21st to end	Night	23% 29% 33% 13% 2	924
February	1st to 10th	Night	29% 23% 33% 13% 2	840
	11th to 20th	Night	30% 29% 32% 9%	823
	21st to end	Night	30% 26% 30% 13% 1	692
March	1st to 10th	Night	31% 23% 32% 12% 3	840
	11th to 20th	Night	29% 25% 29% 15% 3	840
	21st to end	Night	24% 28% 30% 14% 4 1	924
April	1st to 10th	Night	25% 23% 33% 17% 2	840
	11th to 20th	Night	25% 20% 32% 17% 5%	831
	21st to end	Night	26% 17% 33% 20% 4	840
May	1st to 10th	Night	31% 13% 31% 19% 6%	578
	11th to 20th	Night	21% 11% 37% 24% 7%	414
	21st to end	Night	19% 9% 29% 32% 11%	455
June	1st to 10th	Night	17% 9% 28% 34% 13%	420
	11th to 20th	Night	16% 8% 34% 32% 9%	420
	21st to end	Night	12% 5% 33% 40% 9% 1	420
July	1st to 10th	Night	13% 4 25% 40% 16% 2	410
	11th to 20th	Night	11% 5% 26% 42% 14% 1	408
	21st to end	Night	12% 6% 25% 41% 15% 1	460
August	1st to 10th	Night	14% 2 24% 36% 21% 2	598
	11th to 20th	Night	15% 4 19% 40% 20% 2	766
	21st to end	Night	15% 5% 25% 34% 19% 1	924
September	1st to 10th	Night	18% 7% 25% 30% 18% 2	840
	11th to 20th	Night	15% 7% 24% 27% 22% 5%	813
	21st to end	Night	20% 9% 25% 30% 15% 2	800
October	1st to 10th	Night	24% 13% 22% 25% 15% 2	800
	11th to 20th	Night	22% 15% 30% 26% 7% 1	800
	21st to end	Night	27% 17% 32% 19% 5%	880
November	1st to 10th	Night	20% 20% 30% 22% 7% 1	820
	11th to 20th	Night	27% 21% 30% 15% 6% 1	840
	21st to end	Night	25% 24% 31% 16% 5%	840
December	1st to 10th	Night	28% 24% 30% 14% 4	840
	11th to 20th	Night	29% 24% 30% 15% 3	840
	21st to end	Night	29% 25% 29% 14% 3	924

Page generated at 2026-09-11 04:11:57. Version ac07

Copyright © 2026 Attilla Danko.