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 2025-05-11.

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% 7% 35%	113843
	Night	15% 8% 3 8% 5% 4 4 4 5% 7% 37%	115107
Transparency	Day	46% 6% 11% 22% 13% 2	117394
	Night	45% 6% 12% 22% 13% 2	119720
Seeing	Day	25% 17% 29% 18% 8% 3	15450
	Night	23% 18% 29% 21% 8% 1	24789

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% 11% 6% 15% 8% 5% 5% 3 4 5% 28%	3597
	11th to 20th	Day	11% 14% 6% 14% 5% 5% 5% 3 4 6% 27%	3570
	21st to end	Day	15% 11% 5% 9% 5% 5% 4 4 4 5% 33%	4436
February	1st to 10th	Day	15% 11% 4 8% 6% 5% 5% 4 6% 5% 30%	1800
	11th to 20th	Day	12% 10% 4 8% 6% 6% 4 3 6% 7% 33%	1870
	21st to end	Day	17% 12% 3 8% 6% 5% 3 3 6% 6% 31%	1650
March	1st to 10th	Day	19% 9% 3 7% 5% 5% 4 3 5% 5% 34%	4476
	11th to 20th	Day	11% 9% 3 7% 5% 4 5% 4 6% 7% 40%	4968
	21st to end	Day	16% 8% 3 6% 4 4 5% 4 6% 7% 36%	5804
April	1st to 10th	Day	16% 12% 3 7% 5% 5% 4 4 5% 6% 34%	2400
	11th to 20th	Day	15% 11% 2 7% 4 4 4 4 5% 6% 37%	2374
	21st to end	Day	16% 7% 2 8% 5% 5% 4 4 5% 6% 36%	2400
May	1st to 10th	Day	25% 8% 2 7% 5% 4 4 3 5% 6% 31%	4355
	11th to 20th	Day	22% 9% 3 7% 5% 5% 5% 5% 5% 7% 28%	4398
	21st to end	Day	12% 6% 2 5% 4 4 5% 4 7% 10% 41%	4837
June	1st to 10th	Day	14% 7% 2 7% 5% 6% 5% 5% 6% 8% 34%	2660
	11th to 20th	Day	13% 7% 3 8% 6% 6% 5% 5% 5% 8% 33%	2660
	21st to end	Day	12% 6% 3 7% 5% 6% 4 5% 6% 10% 36%	2660
July	1st to 10th	Day	8% 5% 2 8% 6% 7% 6% 5% 7% 10% 35%	4440
	11th to 20th	Day	8% 6% 3 6% 5% 5% 6% 5% 7% 11% 38%	4440
	21st to end	Day	12% 8% 3 8% 6% 5% 5% 4 7% 8% 34%	4814
August	1st to 10th	Day	21% 6% 3 7% 5% 5% 5% 4 7% 8% 29%	4141
	11th to 20th	Day	12% 7% 3 6% 4 5% 6% 5% 6% 8% 37%	3791
	21st to end	Day	14% 6% 3 5% 4 4 4 4 6% 9% 42%	4180
September	1st to 10th	Day	16% 5% 2 6% 6% 5% 5% 4 5% 7% 40%	2280
	11th to 20th	Day	13% 5% 2 6% 4 4 4 3 6% 8% 46%	2252
	21st to end	Day	18% 7% 2 7% 4 4 5% 4 6% 6% 37%	2085
October	1st to 10th	Day	17% 8% 3 6% 5% 4 4 3 5% 7% 39%	1900
	11th to 20th	Day	13% 8% 3 7% 4 4 5% 3 6% 8% 40%	1900
	21st to end	Day	19% 9% 2 6% 5% 4 5% 3 5% 7% 33%	1990
November	1st to 10th	Day	13% 8% 2 5% 4 4 3 3 5% 6% 46%	1761
	11th to 20th	Day	15% 9% 2 7% 4 5% 4 4 6% 7% 38%	1800
	21st to end	Day	17% 8% 3 8% 5% 4 5% 4 6% 7% 33%	1608
December	1st to 10th	Day	12% 9% 4 11% 6% 5% 6% 4 6% 6% 31%	2600
	11th to 20th	Day	18% 11% 4 8% 5% 4 3 3 5% 5% 32%	2986
	21st to end	Day	14% 11% 6% 12% 6% 5% 5% 4 5% 6% 26%	3960
January	1st to 10th	Night	11% 8% 5% 13% 7% 5% 5% 3 6% 7% 29%	6349
	11th to 20th	Night	11% 10% 5% 15% 5% 5% 5% 4 5% 7% 29%	6315
	21st to end	Night	15% 9% 3 8% 6% 5% 5% 4 6% 7% 32%	6518
February	1st to 10th	Night	15% 10% 4 7% 5% 4 5% 3 5% 7% 34%	2600
	11th to 20th	Night	13% 9% 4 8% 7% 5% 6% 5% 7% 7% 31%	2414
	21st to end	Night	15% 10% 3 8% 6% 4 4 3 5% 6% 34%	1980
March	1st to 10th	Night	16% 10% 4 7% 5% 3 4 4 5% 5% 36%	5364
	11th to 20th	Night	10% 8% 4 7% 5% 4 4 4 6% 8% 41%	4988
	21st to end	Night	14% 9% 3 9% 5% 4 4 4 6% 6% 36%	5128
April	1st to 10th	Night	16% 9% 4 9% 5% 5% 5% 4 5% 7% 31%	2000
	11th to 20th	Night	18% 8% 2 6% 4 5% 4 4 6% 7% 36%	1975
	21st to end	Night	18% 8% 3 6% 4 5% 4 3 5% 6% 39%	2000
May	1st to 10th	Night	28% 9% 3 6% 4 4 3 3 5% 6% 30%	2835
	11th to 20th	Night	21% 10% 3 7% 4 4 3 3 6% 7% 33%	2501
	21st to end	Night	11% 7% 2 7% 5% 5% 5% 4 6% 10% 38%	2738
June	1st to 10th	Night	16% 6% 2 5% 5% 4 5% 4 5% 8% 41%	1520
	11th to 20th	Night	12% 6% 2 7% 4 4 5% 4 6% 9% 42%	1520
	21st to end	Night	11% 4 1 4 3 4 4 4 8% 9% 46%	1520
July	1st to 10th	Night	9% 6% 2 7% 5% 5% 5% 4 7% 8% 42%	2520
	11th to 20th	Night	9% 6% 2 6% 4 5% 5% 5% 7% 11% 39%	2520
	21st to end	Night	13% 7% 2 6% 5% 4 4 5% 6% 6% 42%	2739
August	1st to 10th	Night	20% 7% 2 6% 4 5% 4 3 6% 9% 34%	2785
	11th to 20th	Night	15% 5% 3 6% 5% 4 4 4 5% 7% 42%	3003
	21st to end	Night	12% 5% 2 5% 4 4 3 3 6% 8% 49%	3476
September	1st to 10th	Night	13% 6% 2 5% 4 4 4 3 5% 7% 46%	1900
	11th to 20th	Night	12% 6% 1 4 4 3 4 3 4 7% 52%	1928
	21st to end	Night	16% 7% 2 6% 5% 4 4 4 5% 6% 41%	2092
October	1st to 10th	Night	18% 7% 2 6% 4 3 3 3 4 6% 42%	2280
	11th to 20th	Night	16% 7% 2 6% 3 3 4 3 5% 6% 44%	2280
	21st to end	Night	20% 8% 2 4 4 3 4 3 6% 7% 39%	2608
November	1st to 10th	Night	12% 6% 2 6% 5% 4 4 3 4 7% 47%	2537
	11th to 20th	Night	16% 8% 2 6% 4 4 3 3 5% 7% 41%	2600
	21st to end	Night	14% 9% 4 6% 4 4 4 4 6% 8% 38%	2790
December	1st to 10th	Night	13% 9% 3 9% 4 5% 4 4 6% 7% 35%	4580
	11th to 20th	Night	20% 11% 3 7% 4 4 4 3 4 5% 34%	5208
	21st to end	Night	17% 13% 5% 10% 5% 5% 4 3 5% 6% 28%	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	52% 8% 8% 23% 8% 1	3598
	11th to 20th	Day	57% 4 8% 18% 10% 3	3600
	21st to end	Day	51% 5% 9% 23% 12% 1	4436
February	1st to 10th	Day	53% 5% 12% 18% 11% 1	1800
	11th to 20th	Day	50% 4 9% 23% 13% 1	1879
	21st to end	Day	53% 3 9% 23% 10% 2	1650
March	1st to 10th	Day	51% 4 10% 18% 12% 6%	4479
	11th to 20th	Day	40% 7% 14% 27% 8% 4	4968
	21st to end	Day	46% 6% 9% 12% 23% 4	5804
April	1st to 10th	Day	51% 4 9% 21% 13% 3	2400
	11th to 20th	Day	46% 5% 11% 21% 14% 2	2374
	21st to end	Day	47% 5% 8% 22% 14% 4	2400
May	1st to 10th	Day	54% 5% 10% 19% 10% 2	4369
	11th to 20th	Day	56% 5% 12% 19% 7% 1	4402
	21st to end	Day	36% 7% 13% 26% 15% 2	4837
June	1st to 10th	Day	46% 7% 12% 21% 14% 1	2660
	11th to 20th	Day	47% 7% 13% 22% 10% 2	2660
	21st to end	Day	42% 7% 13% 26% 11%	2660
July	1st to 10th	Day	42% 9% 13% 24% 11% 1	4370
	11th to 20th	Day	38% 7% 16% 25% 13%	4365
	21st to end	Day	47% 7% 12% 19% 14% 1	4661
August	1st to 10th	Day	51% 7% 13% 20% 8%	4127
	11th to 20th	Day	41% 7% 15% 28% 9%	3829
	21st to end	Day	37% 6% 11% 32% 12% 1	4180
September	1st to 10th	Day	43% 4 12% 23% 16% 1	2280
	11th to 20th	Day	37% 4 11% 25% 23% 2	2252
	21st to end	Day	46% 5% 11% 20% 16% 2	2085
October	1st to 10th	Day	44% 5% 9% 22% 19% 2	3160
	11th to 20th	Day	37% 4 9% 27% 18% 6%	3140
	21st to end	Day	33% 4 16% 28% 16% 3	3254
November	1st to 10th	Day	38% 4 12% 25% 17% 3	1761
	11th to 20th	Day	44% 6% 10% 24% 15% 3	1800
	21st to end	Day	48% 5% 14% 23% 8% 1	1608
December	1st to 10th	Day	51% 6% 15% 21% 7% 1	2600
	11th to 20th	Day	51% 5% 14% 19% 11% 1	2986
	21st to end	Day	56% 6% 10% 16% 11% 1	3960
January	1st to 10th	Night	51% 6% 10% 21% 10% 2	6349
	11th to 20th	Night	52% 6% 13% 17% 9% 3	6360
	21st to end	Night	49% 6% 10% 16% 16% 2	6518
February	1st to 10th	Night	48% 5% 13% 23% 10% 1	2600
	11th to 20th	Night	49% 6% 10% 19% 14% 2	2416
	21st to end	Night	50% 4 9% 22% 13% 3	1980
March	1st to 10th	Night	48% 4 13% 18% 14% 3	5374
	11th to 20th	Night	39% 7% 17% 24% 9% 4	4989
	21st to end	Night	46% 7% 7% 16% 20% 3	5128
April	1st to 10th	Night	52% 5% 10% 18% 12% 3	2000
	11th to 20th	Night	45% 6% 11% 22% 16% 1	1975
	21st to end	Night	44% 6% 9% 22% 15% 4	2000
May	1st to 10th	Night	55% 5% 10% 21% 8% 1	2841
	11th to 20th	Night	52% 6% 14% 17% 9% 1	2502
	21st to end	Night	39% 8% 14% 24% 13% 1	2739
June	1st to 10th	Night	41% 6% 11% 26% 16%	1520
	11th to 20th	Night	39% 6% 18% 27% 10% 1	1520
	21st to end	Night	32% 7% 18% 29% 13%	1520
July	1st to 10th	Night	39% 8% 17% 19% 15% 1	2480
	11th to 20th	Night	38% 8% 16% 25% 12% 1	2472
	21st to end	Night	40% 7% 14% 20% 17% 1	2651
August	1st to 10th	Night	47% 8% 17% 20% 7%	2775
	11th to 20th	Night	41% 6% 17% 27% 10%	3031
	21st to end	Night	34% 6% 12% 33% 15% 1	3476
September	1st to 10th	Night	38% 5% 13% 27% 16% 1	1900
	11th to 20th	Night	33% 4 12% 26% 24% 2	1928
	21st to end	Night	42% 5% 10% 23% 19% 1	2092
October	1st to 10th	Night	44% 6% 11% 23% 16% 1	3800
	11th to 20th	Night	32% 5% 11% 25% 22% 5%	3779
	21st to end	Night	32% 5% 16% 28% 17% 1	4294
November	1st to 10th	Night	38% 4 12% 23% 20% 3	2537
	11th to 20th	Night	44% 4 10% 23% 17% 3	2600
	21st to end	Night	44% 5% 16% 25% 10% 1	2790
December	1st to 10th	Night	46% 6% 13% 28% 6%	4580
	11th to 20th	Night	51% 5% 12% 18% 13% 1	5208
	21st to end	Night	56% 6% 10% 16% 11% 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	40% 26% 25% 9% 1 1	200
	11th to 20th	Day	37% 31% 25% 7% 1	200
	21st to end	Day	31% 27% 30% 8% 4	323
February	1st to 10th	Day	37% 27% 29% 5% 1	300
	11th to 20th	Day	40% 26% 29% 4 1	418
	21st to end	Day	36% 26% 29% 7% 2	414
March	1st to 10th	Day	34% 22% 32% 10% 2	500
	11th to 20th	Day	31% 26% 29% 11% 2 1	500
	21st to end	Day	33% 26% 28% 8% 3 1	550
April	1st to 10th	Day	36% 25% 24% 11% 4	500
	11th to 20th	Day	32% 25% 25% 13% 5% 1	492
	21st to end	Day	28% 22% 33% 10% 4 2	500
May	1st to 10th	Day	34% 16% 29% 13% 6% 2	503
	11th to 20th	Day	23% 16% 33% 18% 7% 2	487
	21st to end	Day	19% 10% 32% 23% 13% 3	529
June	1st to 10th	Day	22% 12% 30% 24% 9% 2	490
	11th to 20th	Day	19% 14% 26% 26% 13% 2	490
	21st to end	Day	16% 13% 34% 25% 9% 2	490
July	1st to 10th	Day	15% 6% 32% 26% 16% 5%	485
	11th to 20th	Day	11% 7% 30% 31% 19% 3	484
	21st to end	Day	13% 9% 35% 29% 11% 3	532
August	1st to 10th	Day	12% 7% 30% 27% 17% 6%	486
	11th to 20th	Day	14% 6% 27% 31% 18% 5%	479
	21st to end	Day	14% 9% 29% 26% 14% 7%	539
September	1st to 10th	Day	21% 10% 25% 22% 15% 8%	490
	11th to 20th	Day	13% 9% 27% 22% 17% 11%	490
	21st to end	Day	23% 11% 31% 19% 13% 3	490
October	1st to 10th	Day	25% 12% 25% 20% 12% 6%	490
	11th to 20th	Day	22% 19% 29% 21% 6% 2	490
	21st to end	Day	28% 18% 29% 18% 6% 1	486
November	1st to 10th	Day	23% 21% 26% 20% 9% 2	395
	11th to 20th	Day	29% 25% 29% 12% 5% 1	400
	21st to end	Day	34% 22% 32% 11% 1	208
December	1st to 10th	Day	31% 30% 28% 8% 4 1	200
	11th to 20th	Day	40% 25% 26% 6% 4	200
	21st to end	Day	31% 22% 31% 11% 5%	220
January	1st to 10th	Night	26% 28% 32% 11% 2	800
	11th to 20th	Night	28% 25% 31% 14% 2	800
	21st to end	Night	22% 29% 34% 13% 2	880
February	1st to 10th	Night	30% 24% 33% 13% 1	800
	11th to 20th	Night	30% 29% 32% 9% 1	783
	21st to end	Night	31% 26% 29% 13% 2	660
March	1st to 10th	Night	31% 22% 31% 12% 3	800
	11th to 20th	Night	28% 25% 29% 15% 3	800
	21st to end	Night	23% 27% 30% 14% 4 1	880
April	1st to 10th	Night	25% 23% 33% 18% 2	800
	11th to 20th	Night	26% 20% 32% 17% 5%	791
	21st to end	Night	26% 18% 32% 20% 4	800
May	1st to 10th	Night	31% 13% 30% 20% 7%	550
	11th to 20th	Night	20% 11% 38% 24% 7% 1	376
	21st to end	Night	16% 8% 29% 34% 12%	411
June	1st to 10th	Night	17% 9% 27% 34% 13%	380
	11th to 20th	Night	14% 7% 33% 35% 10% 1	380
	21st to end	Night	12% 5% 34% 39% 9% 1	380
July	1st to 10th	Night	12% 5% 26% 39% 17% 2	370
	11th to 20th	Night	11% 4 27% 42% 15% 1	368
	21st to end	Night	13% 6% 25% 40% 15% 1	416
August	1st to 10th	Night	14% 2 25% 36% 19% 2	540
	11th to 20th	Night	15% 4 19% 39% 21% 3	692
	21st to end	Night	15% 4 24% 34% 21% 1	836
September	1st to 10th	Night	17% 7% 26% 29% 18% 2	760
	11th to 20th	Night	15% 7% 25% 26% 21% 5%	760
	21st to end	Night	21% 8% 26% 28% 15% 2	760
October	1st to 10th	Night	24% 13% 22% 24% 14% 2	760
	11th to 20th	Night	21% 14% 31% 26% 7% 1	760
	21st to end	Night	27% 18% 31% 19% 5%	836
November	1st to 10th	Night	19% 21% 30% 23% 7% 1	780
	11th to 20th	Night	26% 21% 31% 16% 6% 1	800
	21st to end	Night	25% 24% 31% 16% 5%	800
December	1st to 10th	Night	28% 23% 30% 13% 5%	800
	11th to 20th	Night	28% 23% 30% 15% 3	800
	21st to end	Night	28% 25% 30% 14% 3	880

Page generated at 2025-05-08 09:33:55. Version ac07

Copyright © 2025 Attilla Danko.