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 2024-11-01.

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 7% 5% 5% 5% 4 6% 7% 34%	101395
	Night	15% 8% 3 7% 5% 4 4 4 6% 7% 37%	97575
Transparency	Day	47% 6% 12% 22% 12% 1	101152
	Night	45% 6% 12% 23% 12% 1	97438
Seeing	Day	24% 17% 29% 18% 9% 3	14853
	Night	23% 17% 30% 22% 8% 1	24039

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% 9% 5% 5% 5% 3 4 5% 34%	2517
	11th to 20th	Day	12% 13% 7% 12% 5% 6% 5% 3 4 6% 27%	2520
	21st to end	Day	18% 14% 5% 10% 5% 4 3 3 5% 6% 26%	3094
February	1st to 10th	Day	16% 11% 4 8% 6% 5% 4 4 6% 5% 30%	1710
	11th to 20th	Day	12% 10% 4 7% 6% 6% 5% 4 6% 7% 34%	1774
	21st to end	Day	17% 12% 3 8% 6% 5% 3 3 5% 6% 31%	1570
March	1st to 10th	Day	23% 11% 4 8% 4 4 4 3 5% 4 31%	3116
	11th to 20th	Day	9% 10% 4 7% 6% 5% 5% 5% 6% 7% 36%	3468
	21st to end	Day	20% 9% 3 6% 4 3 4 4 5% 6% 37%	4056
April	1st to 10th	Day	15% 12% 3 7% 5% 5% 4 4 5% 6% 34%	2280
	11th to 20th	Day	15% 10% 2 7% 4 4 4 4 5% 6% 37%	2254
	21st to end	Day	17% 7% 2 8% 5% 5% 4 4 5% 6% 36%	2280
May	1st to 10th	Day	25% 8% 2 7% 5% 4 4 4 5% 6% 31%	4221
	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% 9% 2 5% 4 4 3 3 5% 7% 45%	1671
	11th to 20th	Day	15% 9% 2 7% 4 5% 4 4 6% 7% 37%	1710
	21st to end	Day	17% 8% 3 8% 5% 4 5% 4 6% 7% 34%	1528
December	1st to 10th	Day	15% 12% 5% 9% 5% 5% 6% 4 6% 5% 29%	1520
	11th to 20th	Day	19% 10% 4 8% 5% 4 3 3 5% 6% 32%	1906
	21st to end	Day	18% 13% 6% 10% 6% 5% 5% 5% 5% 5% 22%	2772
January	1st to 10th	Night	14% 8% 6% 7% 5% 5% 4 4 6% 8% 34%	4429
	11th to 20th	Night	13% 11% 5% 10% 5% 5% 5% 4 5% 6% 30%	4440
	21st to end	Night	21% 12% 4 8% 6% 4 4 4 5% 6% 26%	4560
February	1st to 10th	Night	15% 10% 4 7% 5% 4 4 3 5% 7% 35%	2470
	11th to 20th	Night	12% 9% 4 8% 6% 5% 6% 5% 7% 7% 31%	2291
	21st to end	Night	16% 10% 3 8% 6% 4 4 3 5% 6% 35%	1884
March	1st to 10th	Night	20% 13% 3 7% 4 3 4 3 5% 5% 32%	3724
	11th to 20th	Night	9% 9% 5% 7% 6% 4 4 4 6% 8% 37%	3488
	21st to end	Night	13% 10% 3 9% 5% 4 4 3 5% 5% 39%	3576
April	1st to 10th	Night	15% 9% 3 9% 5% 5% 5% 4 5% 7% 31%	1900
	11th to 20th	Night	17% 7% 2 5% 4 5% 4 4 6% 7% 37%	1875
	21st to end	Night	18% 8% 3 6% 4 5% 4 3 5% 6% 39%	1900
May	1st to 10th	Night	27% 9% 3 6% 4 4 3 3 5% 6% 31%	2748
	11th to 20th	Night	21% 10% 3 7% 4 4 3 3 6% 7% 32%	2495
	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 3 3 3 3 6% 7% 38%	2608
November	1st to 10th	Night	12% 7% 2 6% 5% 4 4 3 4 7% 46%	2414
	11th to 20th	Night	17% 8% 2 6% 4 4 3 3 5% 7% 40%	2470
	21st to end	Night	13% 8% 3 6% 5% 5% 4 4 6% 8% 38%	2650
December	1st to 10th	Night	17% 10% 3 8% 5% 5% 5% 4 6% 8% 30%	2660
	11th to 20th	Night	16% 10% 3 8% 5% 5% 5% 4 6% 7% 32%	3288
	21st to end	Night	21% 12% 5% 9% 5% 5% 4 3 4 6% 27%	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	48% 6% 10% 26% 7% 2	2518
	11th to 20th	Day	58% 4 9% 19% 7% 2	2520
	21st to end	Day	58% 5% 9% 19% 8% 1	3094
February	1st to 10th	Day	53% 5% 12% 18% 11% 1	1710
	11th to 20th	Day	49% 5% 9% 23% 13% 1	1783
	21st to end	Day	53% 3 9% 22% 10% 2	1570
March	1st to 10th	Day	56% 3 9% 20% 9% 2	3119
	11th to 20th	Day	42% 8% 12% 27% 10% 1	3468
	21st to end	Day	48% 4 8% 15% 22% 4	4056
April	1st to 10th	Day	50% 5% 9% 21% 13% 3	2280
	11th to 20th	Day	46% 5% 11% 22% 14% 2	2254
	21st to end	Day	47% 5% 8% 22% 14% 4	2280
May	1st to 10th	Day	54% 5% 10% 19% 11% 2	4235
	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	47% 4 10% 22% 14% 2	1900
	11th to 20th	Day	42% 4 12% 25% 15% 2	1900
	21st to end	Day	50% 5% 12% 20% 12% 2	1990
November	1st to 10th	Day	39% 4 12% 25% 17% 3	1671
	11th to 20th	Day	44% 6% 9% 24% 15% 2	1710
	21st to end	Day	47% 5% 14% 24% 9% 1	1528
December	1st to 10th	Day	55% 5% 15% 15% 10% 1	1520
	11th to 20th	Day	52% 5% 14% 21% 7%	1906
	21st to end	Day	62% 6% 9% 16% 6%	2772
January	1st to 10th	Night	45% 5% 12% 27% 9% 2	4429
	11th to 20th	Night	52% 7% 12% 20% 8% 1	4440
	21st to end	Night	56% 7% 8% 19% 9% 1	4560
February	1st to 10th	Night	47% 5% 14% 22% 10% 1	2470
	11th to 20th	Night	48% 6% 10% 20% 14% 2	2293
	21st to end	Night	50% 3 9% 23% 13% 3	1884
March	1st to 10th	Night	53% 5% 10% 19% 11% 2	3734
	11th to 20th	Night	40% 8% 14% 27% 11% 1	3489
	21st to end	Night	45% 6% 7% 18% 20% 5%	3576
April	1st to 10th	Night	51% 5% 11% 19% 13% 2	1900
	11th to 20th	Night	44% 6% 11% 22% 16% 1	1875
	21st to end	Night	44% 6% 10% 21% 15% 3	1900
May	1st to 10th	Night	55% 5% 10% 21% 8% 1	2754
	11th to 20th	Night	52% 6% 14% 17% 9% 1	2496
	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	43% 5% 12% 24% 15% 1	2280
	11th to 20th	Night	39% 5% 13% 27% 14% 2	2280
	21st to end	Night	44% 4 13% 24% 14% 1	2608
November	1st to 10th	Night	39% 4 13% 22% 20% 3	2414
	11th to 20th	Night	43% 4 11% 23% 16% 3	2470
	21st to end	Night	42% 5% 16% 25% 10% 1	2650
December	1st to 10th	Night	51% 6% 12% 22% 9% 1	2660
	11th to 20th	Night	49% 7% 13% 19% 11% 1	3288
	21st to end	Night	56% 7% 12% 19% 7%	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	38% 24% 27% 9% 1 1	180
	11th to 20th	Day	36% 30% 26% 8% 1	180
	21st to end	Day	30% 24% 32% 9% 4	290
February	1st to 10th	Day	36% 26% 31% 6% 1	270
	11th to 20th	Day	37% 27% 31% 4 1	382
	21st to end	Day	36% 25% 29% 8% 2	382
March	1st to 10th	Day	33% 21% 33% 11% 2	460
	11th to 20th	Day	31% 26% 29% 11% 2 1	460
	21st to end	Day	34% 26% 27% 8% 4 1	506
April	1st to 10th	Day	33% 25% 25% 12% 4	460
	11th to 20th	Day	29% 25% 26% 13% 6% 1	452
	21st to end	Day	29% 21% 33% 11% 3 2	460
May	1st to 10th	Day	34% 16% 29% 13% 6% 2	463
	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% 17% 29% 19% 6% 1	486
November	1st to 10th	Day	23% 19% 26% 21% 9% 2	365
	11th to 20th	Day	30% 25% 29% 12% 4 1	370
	21st to end	Day	31% 22% 34% 12% 2	188
December	1st to 10th	Day	31% 31% 25% 8% 4 1	180
	11th to 20th	Day	39% 23% 29% 6% 3	180
	21st to end	Day	33% 23% 29% 11% 4	198
January	1st to 10th	Night	26% 27% 34% 11% 2	760
	11th to 20th	Night	28% 25% 31% 14% 2	760
	21st to end	Night	22% 29% 34% 14% 2	836
February	1st to 10th	Night	29% 24% 33% 13% 1	760
	11th to 20th	Night	28% 30% 32% 9% 1	743
	21st to end	Night	32% 26% 28% 13% 2	628
March	1st to 10th	Night	31% 22% 32% 12% 3	760
	11th to 20th	Night	28% 25% 29% 15% 3	760
	21st to end	Night	23% 28% 29% 15% 4 1	836
April	1st to 10th	Night	24% 23% 33% 18% 2	760
	11th to 20th	Night	25% 20% 32% 18% 6%	751
	21st to end	Night	25% 18% 33% 20% 4	760
May	1st to 10th	Night	31% 12% 30% 20% 7%	523
	11th to 20th	Night	20% 11% 38% 24% 7% 1	374
	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% 22% 7% 1	743
	11th to 20th	Night	27% 21% 30% 16% 6% 1	760
	21st to end	Night	23% 24% 31% 16% 5%	760
December	1st to 10th	Night	29% 23% 31% 13% 5%	760
	11th to 20th	Night	27% 24% 31% 15% 3	760
	21st to end	Night	28% 25% 31% 14% 3	836

Page generated at 2024-10-29 11:20:49. Version ac07

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