Pigeon Forge Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pigeon Forge Area clear sky chart from 2005-11-06 to 2025-10-19.

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	11% 8% 3 7% 5% 5% 5% 4 6% 8% 37%	126408
	Night	12% 8% 3 7% 5% 4 5% 4 6% 8% 39%	123313
Transparency	Day	41% 9% 13% 20% 14% 3	130158
	Night	41% 8% 12% 20% 15% 3	127632
Seeing	Day	16% 13% 24% 24% 15% 7%	16184
	Night	16% 10% 22% 30% 19% 3	26186

By Month

Percentage Cloud Cover SE (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	10% 15% 5% 10% 5% 3 3 3 6% 6% 33%	4056
	11th to 20th	Day	9% 13% 7% 7% 4 6% 4 3 4 4 40%	4060
	21st to end	Day	13% 13% 5% 9% 4 3 3 3 4 6% 37%	4466
February	1st to 10th	Day	13% 13% 3 9% 5% 5% 5% 4 5% 6% 33%	1955
	11th to 20th	Day	16% 13% 4 10% 5% 4 3 3 5% 6% 32%	1948
	21st to end	Day	16% 10% 3 7% 5% 5% 4 4 5% 5% 37%	1650
March	1st to 10th	Day	16% 11% 4 7% 5% 5% 4 3 5% 6% 36%	4697
	11th to 20th	Day	10% 9% 3 7% 5% 3 3 3 4 7% 47%	4980
	21st to end	Day	14% 8% 3 6% 5% 4 4 4 5% 6% 42%	5465
April	1st to 10th	Day	11% 8% 1 6% 5% 5% 5% 4 7% 8% 41%	2220
	11th to 20th	Day	14% 7% 2 6% 4 4 4 4 5% 7% 43%	2418
	21st to end	Day	14% 7% 2 6% 5% 6% 5% 4 6% 7% 40%	2600
May	1st to 10th	Day	12% 7% 3 9% 6% 5% 7% 5% 7% 9% 29%	5862
	11th to 20th	Day	13% 7% 3 10% 7% 7% 6% 5% 7% 8% 27%	5861
	21st to end	Day	12% 7% 2 7% 6% 5% 6% 6% 8% 10% 32%	6433
June	1st to 10th	Day	8% 6% 2 7% 6% 6% 7% 5% 8% 10% 34%	2600
	11th to 20th	Day	5% 5% 2 7% 7% 7% 7% 5% 9% 11% 35%	2600
	21st to end	Day	7% 5% 2 7% 5% 6% 7% 6% 8% 11% 36%	2600
July	1st to 10th	Day	7% 4 2 6% 5% 5% 6% 6% 8% 12% 40%	5900
	11th to 20th	Day	10% 5% 2 7% 6% 6% 7% 5% 9% 11% 32%	5900
	21st to end	Day	12% 7% 3 10% 7% 8% 8% 6% 9% 10% 22%	6424
August	1st to 10th	Day	12% 5% 2 7% 5% 6% 6% 6% 8% 10% 34%	4234
	11th to 20th	Day	10% 5% 2 6% 5% 5% 6% 5% 9% 10% 36%	4151
	21st to end	Day	8% 4 2 6% 5% 5% 5% 4 7% 7% 48%	4287
September	1st to 10th	Day	12% 5% 2 6% 5% 5% 5% 4 7% 9% 40%	2200
	11th to 20th	Day	14% 6% 2 6% 5% 5% 4 4 7% 7% 40%	2200
	21st to end	Day	13% 6% 2 5% 4 5% 5% 4 6% 8% 42%	2200
October	1st to 10th	Day	11% 5% 2 6% 3 4 4 3 6% 6% 52%	2200
	11th to 20th	Day	11% 6% 2 4 4 3 3 3 4 5% 54%	2001
	21st to end	Day	13% 6% 1 5% 3 3 3 3 5% 6% 51%	2090
November	1st to 10th	Day	10% 6% 2 6% 4 2 3 2 5% 7% 53%	1781
	11th to 20th	Day	10% 8% 2 5% 4 3 4 4 6% 8% 46%	1800
	21st to end	Day	10% 10% 3 7% 4 4 4 3 6% 5% 44%	1800
December	1st to 10th	Day	9% 9% 3 8% 4 4 5% 5% 6% 7% 41%	2930
	11th to 20th	Day	14% 14% 3 7% 5% 6% 5% 4 6% 5% 30%	3373
	21st to end	Day	8% 9% 5% 7% 5% 5% 5% 4 6% 8% 36%	4466
January	1st to 10th	Night	11% 14% 5% 12% 5% 4 4 3 4 5% 32%	5889
	11th to 20th	Night	13% 12% 4 10% 6% 4 3 3 4 6% 35%	5900
	21st to end	Night	12% 10% 4 8% 5% 5% 5% 3 4 5% 39%	6490
February	1st to 10th	Night	13% 11% 3 6% 4 5% 4 4 7% 6% 36%	2440
	11th to 20th	Night	17% 12% 5% 8% 5% 5% 4 3 5% 4 32%	2338
	21st to end	Night	16% 10% 3 8% 5% 4 5% 3 6% 7% 33%	1980
March	1st to 10th	Night	16% 13% 3 7% 5% 4 4 3 5% 6% 35%	5154
	11th to 20th	Night	11% 7% 2 4 3 3 4 3 6% 8% 49%	4980
	21st to end	Night	12% 8% 2 5% 5% 5% 5% 4 5% 7% 42%	5467
April	1st to 10th	Night	13% 8% 2 5% 5% 4 4 4 6% 8% 43%	2195
	11th to 20th	Night	12% 9% 2 6% 4 4 3 3 5% 6% 46%	1930
	21st to end	Night	14% 5% 2 6% 4 4 5% 4 5% 7% 43%	1800
May	1st to 10th	Night	11% 7% 3 8% 5% 6% 6% 5% 7% 10% 32%	4033
	11th to 20th	Night	15% 7% 3 8% 6% 6% 7% 5% 7% 8% 28%	4032
	21st to end	Night	14% 6% 3 7% 5% 5% 6% 5% 6% 9% 34%	4421
June	1st to 10th	Night	8% 5% 2 7% 5% 5% 7% 6% 8% 11% 36%	1800
	11th to 20th	Night	4 4 2 7% 4 4 6% 5% 10% 14% 41%	1800
	21st to end	Night	6% 6% 2 6% 5% 5% 6% 5% 7% 11% 40%	1800
July	1st to 10th	Night	11% 5% 2 6% 5% 5% 6% 5% 8% 11% 36%	4058
	11th to 20th	Night	9% 5% 2 7% 5% 5% 5% 6% 8% 12% 37%	4057
	21st to end	Night	12% 7% 3 9% 6% 7% 6% 6% 8% 11% 25%	4427
August	1st to 10th	Night	10% 5% 2 7% 5% 5% 6% 4 7% 10% 39%	2915
	11th to 20th	Night	12% 5% 2 6% 4 5% 4 4 6% 9% 41%	2893
	21st to end	Night	7% 4 2 6% 4 4 5% 4 7% 10% 48%	3586
September	1st to 10th	Night	11% 6% 2 6% 4 4 5% 5% 5% 7% 43%	2190
	11th to 20th	Night	12% 7% 3 6% 4 4 5% 4 5% 7% 43%	2200
	21st to end	Night	11% 6% 2 6% 5% 4 4 3 5% 7% 47%	2200
October	1st to 10th	Night	14% 5% 2 5% 3 3 3 3 4 6% 53%	2200
	11th to 20th	Night	14% 6% 2 4 3 3 4 3 4 6% 52%	2354
	21st to end	Night	13% 6% 2 3 4 3 3 3 5% 6% 51%	2508
November	1st to 10th	Night	13% 6% 2 5% 4 3 3 3 4 5% 51%	2514
	11th to 20th	Night	13% 8% 3 6% 3 3 3 3 5% 7% 46%	2600
	21st to end	Night	12% 9% 3 5% 4 3 4 4 5% 6% 45%	2600
December	1st to 10th	Night	10% 13% 4 8% 5% 4 4 4 5% 5% 38%	4250
	11th to 20th	Night	17% 12% 5% 9% 4 4 4 3 4 5% 33%	4822
	21st to end	Night	10% 12% 4 8% 5% 4 4 5% 6% 8% 34%	6490

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	49% 7% 8% 21% 14% 2	4057
	11th to 20th	Day	46% 8% 7% 14% 24% 1	4060
	21st to end	Day	47% 5% 7% 23% 16% 2	4466
February	1st to 10th	Day	51% 6% 9% 16% 16% 2	1955
	11th to 20th	Day	55% 5% 9% 16% 14% 2	1958
	21st to end	Day	49% 5% 9% 14% 18% 6%	1650
March	1st to 10th	Day	47% 6% 9% 13% 17% 8%	4697
	11th to 20th	Day	37% 6% 6% 17% 25% 9%	4980
	21st to end	Day	43% 5% 8% 29% 13% 1	5465
April	1st to 10th	Day	39% 8% 12% 23% 16% 2	2220
	11th to 20th	Day	40% 6% 9% 18% 23% 4	2418
	21st to end	Day	42% 7% 12% 24% 13% 2	2600
May	1st to 10th	Day	47% 10% 13% 19% 9% 1	5897
	11th to 20th	Day	52% 10% 14% 17% 6% 1	5865
	21st to end	Day	42% 11% 14% 17% 13% 2	6447
June	1st to 10th	Day	41% 11% 17% 19% 10% 2	2600
	11th to 20th	Day	38% 12% 21% 16% 11% 2	2600
	21st to end	Day	38% 13% 17% 18% 12% 3	2600
July	1st to 10th	Day	32% 14% 21% 22% 11%	5835
	11th to 20th	Day	40% 14% 24% 17% 4 1	5831
	21st to end	Day	52% 14% 16% 13% 5%	6240
August	1st to 10th	Day	39% 13% 18% 22% 8%	4221
	11th to 20th	Day	36% 12% 23% 20% 8% 1	4190
	21st to end	Day	31% 11% 14% 33% 10% 1	4287
September	1st to 10th	Day	40% 10% 14% 16% 16% 4	2200
	11th to 20th	Day	41% 9% 12% 21% 15% 2	2200
	21st to end	Day	37% 9% 15% 19% 16% 4	2200
October	1st to 10th	Day	25% 7% 10% 19% 28% 11%	3590
	11th to 20th	Day	24% 4 7% 25% 26% 15%	3254
	21st to end	Day	25% 4 9% 28% 24% 10%	3428
November	1st to 10th	Day	33% 5% 8% 20% 28% 6%	1781
	11th to 20th	Day	37% 5% 9% 22% 24% 5%	1800
	21st to end	Day	40% 6% 8% 23% 19% 4	1800
December	1st to 10th	Day	41% 9% 9% 18% 21% 2	2930
	11th to 20th	Day	52% 8% 10% 15% 13% 2	3370
	21st to end	Day	43% 9% 14% 23% 9% 1	4466
January	1st to 10th	Night	52% 5% 9% 20% 12% 1	5889
	11th to 20th	Night	49% 7% 8% 15% 17% 4	5900
	21st to end	Night	47% 5% 8% 19% 19% 2	6490
February	1st to 10th	Night	48% 6% 11% 18% 16% 2	2440
	11th to 20th	Night	55% 5% 8% 15% 13% 3	2339
	21st to end	Night	50% 6% 9% 16% 15% 5%	1980
March	1st to 10th	Night	49% 6% 7% 16% 18% 4	5154
	11th to 20th	Night	32% 5% 9% 20% 23% 11%	4980
	21st to end	Night	41% 6% 10% 27% 14% 2	5467
April	1st to 10th	Night	38% 7% 13% 23% 16% 3	2195
	11th to 20th	Night	39% 5% 9% 20% 21% 5%	1930
	21st to end	Night	40% 9% 12% 26% 14% 1	1800
May	1st to 10th	Night	45% 10% 17% 20% 7% 1	4060
	11th to 20th	Night	52% 10% 15% 17% 6%	4033
	21st to end	Night	42% 11% 15% 21% 10% 1	4429
June	1st to 10th	Night	38% 13% 18% 21% 11% 1	1800
	11th to 20th	Night	29% 14% 21% 23% 11% 1	1800
	21st to end	Night	36% 12% 16% 21% 12% 3	1800
July	1st to 10th	Night	38% 15% 19% 19% 8%	4015
	11th to 20th	Night	36% 15% 26% 17% 4 1	4006
	21st to end	Night	49% 16% 17% 13% 4	4297
August	1st to 10th	Night	37% 13% 19% 22% 8%	2904
	11th to 20th	Night	36% 12% 22% 22% 8%	2920
	21st to end	Night	28% 11% 16% 33% 11% 1	3586
September	1st to 10th	Night	38% 10% 15% 19% 15% 4	2190
	11th to 20th	Night	39% 9% 14% 19% 18% 1	2200
	21st to end	Night	38% 7% 12% 21% 18% 4	2200
October	1st to 10th	Night	28% 7% 10% 19% 28% 7%	3590
	11th to 20th	Night	26% 4 8% 21% 27% 14%	3840
	21st to end	Night	23% 4 6% 28% 25% 13%	4120
November	1st to 10th	Night	36% 5% 9% 20% 24% 6%	2514
	11th to 20th	Night	39% 5% 7% 21% 22% 6%	2600
	21st to end	Night	40% 5% 9% 23% 19% 4	2600
December	1st to 10th	Night	46% 8% 9% 15% 19% 2	4250
	11th to 20th	Night	53% 7% 8% 17% 14% 2	4824
	21st to end	Night	46% 8% 15% 20% 10% 1	6490

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	23% 26% 32% 17% 2	300
	11th to 20th	Day	28% 28% 26% 15% 2	300
	21st to end	Day	23% 29% 32% 13% 3	330
February	1st to 10th	Day	23% 23% 37% 14% 3 1	300
	11th to 20th	Day	35% 31% 25% 9%	300
	21st to end	Day	35% 27% 28% 9% 1	249
March	1st to 10th	Day	25% 23% 32% 16% 5% 1	387
	11th to 20th	Day	23% 22% 34% 17% 3 1	500
	21st to end	Day	23% 22% 29% 20% 5%	550
April	1st to 10th	Day	21% 22% 28% 21% 8% 1	500
	11th to 20th	Day	20% 18% 28% 21% 10% 2	492
	21st to end	Day	18% 17% 29% 22% 12% 3	500
May	1st to 10th	Day	17% 20% 29% 21% 8% 4	503
	11th to 20th	Day	15% 11% 26% 24% 16% 7%	527
	21st to end	Day	15% 10% 22% 27% 13% 13%	573
June	1st to 10th	Day	10% 7% 27% 30% 16% 10%	530
	11th to 20th	Day	5% 5% 22% 30% 26% 12%	530
	21st to end	Day	9% 4 22% 27% 23% 14%	530
July	1st to 10th	Day	9% 5% 16% 27% 26% 18%	525
	11th to 20th	Day	10% 5% 14% 27% 27% 18%	524
	21st to end	Day	9% 3 13% 32% 26% 16%	576
August	1st to 10th	Day	16% 5% 17% 25% 22% 16%	526
	11th to 20th	Day	8% 5% 17% 30% 27% 13%	519
	21st to end	Day	11% 3 11% 27% 31% 17%	583
September	1st to 10th	Day	8% 5% 12% 31% 32% 12%	530
	11th to 20th	Day	14% 4 12% 27% 31% 12%	530
	21st to end	Day	14% 9% 15% 33% 22% 6%	530
October	1st to 10th	Day	13% 7% 21% 30% 21% 8%	530
	11th to 20th	Day	15% 11% 24% 29% 17% 3	522
	21st to end	Day	18% 9% 24% 31% 14% 3	539
November	1st to 10th	Day	14% 15% 31% 30% 9% 1	319
	11th to 20th	Day	17% 19% 35% 24% 5% 1	300
	21st to end	Day	14% 17% 35% 27% 7%	300
December	1st to 10th	Day	23% 23% 33% 16% 4 1	300
	11th to 20th	Day	22% 15% 35% 23% 4 1	300
	21st to end	Day	22% 19% 35% 18% 5% 1	330
January	1st to 10th	Night	21% 19% 28% 27% 5%	800
	11th to 20th	Night	24% 19% 29% 22% 5%	800
	21st to end	Night	20% 19% 33% 26% 2	880
February	1st to 10th	Night	19% 17% 30% 31% 3	800
	11th to 20th	Night	26% 19% 36% 18% 1	783
	21st to end	Night	24% 21% 31% 22% 2	660
March	1st to 10th	Night	22% 16% 31% 26% 5%	800
	11th to 20th	Night	20% 17% 31% 26% 6% 1	800
	21st to end	Night	20% 14% 31% 27% 8% 1	880
April	1st to 10th	Night	17% 16% 31% 26% 9% 1	795
	11th to 20th	Night	17% 15% 29% 25% 13% 1	593
	21st to end	Night	16% 8% 28% 35% 12% 1	600
May	1st to 10th	Night	14% 10% 27% 31% 15% 3	600
	11th to 20th	Night	15% 6% 23% 34% 21% 3	591
	21st to end	Night	10% 4 16% 32% 32% 6%	650
June	1st to 10th	Night	8% 5% 16% 37% 31% 5%	600
	11th to 20th	Night	4 3 13% 36% 35% 10%	600
	21st to end	Night	7% 2 15% 33% 36% 8%	600
July	1st to 10th	Night	10% 3 7% 29% 43% 8%	585
	11th to 20th	Night	8% 3 7% 27% 44% 11%	582
	21st to end	Night	7% 3 11% 30% 40% 10%	657
August	1st to 10th	Night	8% 5% 7% 29% 43% 9%	597
	11th to 20th	Night	10% 3 7% 34% 41% 6%	594
	21st to end	Night	10% 2 7% 27% 42% 11%	660
September	1st to 10th	Night	11% 4 8% 28% 41% 8%	790
	11th to 20th	Night	15% 4 9% 29% 36% 7%	800
	21st to end	Night	13% 5% 16% 33% 31% 2	800
October	1st to 10th	Night	16% 6% 14% 26% 30% 9%	800
	11th to 20th	Night	17% 8% 21% 33% 19% 3	793
	21st to end	Night	16% 8% 22% 35% 16% 3	836
November	1st to 10th	Night	17% 8% 16% 37% 18% 4	780
	11th to 20th	Night	16% 12% 24% 35% 11% 1	800
	21st to end	Night	18% 10% 25% 33% 13% 1	800
December	1st to 10th	Night	22% 14% 28% 28% 7%	800
	11th to 20th	Night	21% 13% 27% 32% 8% 1	800
	21st to end	Night	21% 15% 25% 33% 5%	880

Page generated at 2025-10-16 01:50:27. Version ac07

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