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 2024-01-13.

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	12% 7% 3 6% 6% 4 5% 5% 6% 8% 37%	74883
	Night	12% 8% 3 6% 5% 3 5% 5% 6% 7% 39%	74855
Transparency	Day	44% 8% 13% 19% 14% 3	74606
	Night	43% 8% 12% 19% 15% 3	74651
Seeing	Day	16% 13% 24% 24% 16% 7%	13781
	Night	16% 10% 22% 29% 19% 4	23893

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	13% 9% 4 9% 7% 3 5% 4 7% 6% 33%	1706
	11th to 20th	Day	13% 13% 5% 9% 5% 4 5% 5% 5% 5% 32%	1638
	21st to end	Day	13% 10% 4 5% 5% 2 4 4 6% 7% 40%	1782
February	1st to 10th	Day	15% 11% 4 8% 6% 3 6% 4 5% 6% 32%	1760
	11th to 20th	Day	17% 11% 5% 9% 6% 3 4 4 4 7% 31%	1748
	21st to end	Day	17% 10% 3 6% 6% 3 5% 4 4 6% 36%	1480
March	1st to 10th	Day	13% 10% 4 5% 4 3 5% 4 5% 7% 40%	1877
	11th to 20th	Day	16% 10% 3 7% 7% 3 3 4 6% 7% 34%	1980
	21st to end	Day	14% 10% 4 6% 6% 3 5% 5% 5% 7% 35%	2178
April	1st to 10th	Day	10% 7% 2 5% 5% 4 5% 5% 7% 8% 42%	1998
	11th to 20th	Day	14% 7% 2 5% 4 3 4 4 5% 7% 43%	2173
	21st to end	Day	14% 6% 3 5% 6% 4 5% 4 6% 7% 40%	2340
May	1st to 10th	Day	12% 6% 3 6% 5% 4 6% 7% 6% 8% 39%	2340
	11th to 20th	Day	14% 6% 3 7% 7% 4 7% 6% 6% 7% 33%	2301
	21st to end	Day	12% 6% 2 6% 6% 4 5% 7% 8% 10% 34%	2531
June	1st to 10th	Day	9% 6% 3 5% 7% 5% 6% 7% 8% 10% 34%	2340
	11th to 20th	Day	6% 5% 3 6% 8% 5% 7% 6% 8% 11% 36%	2340
	21st to end	Day	8% 5% 3 7% 6% 5% 7% 7% 8% 10% 35%	2340
July	1st to 10th	Day	9% 5% 3 7% 8% 6% 8% 8% 9% 10% 28%	2340
	11th to 20th	Day	11% 6% 3 6% 7% 5% 6% 7% 8% 10% 31%	2340
	21st to end	Day	10% 5% 3 7% 7% 5% 8% 8% 9% 11% 28%	2547
August	1st to 10th	Day	11% 6% 2 6% 7% 5% 7% 7% 8% 10% 30%	2327
	11th to 20th	Day	10% 5% 3 7% 8% 5% 7% 7% 8% 10% 30%	2295
	21st to end	Day	12% 5% 3 7% 7% 5% 6% 6% 8% 9% 32%	2366
September	1st to 10th	Day	12% 5% 2 6% 6% 4 6% 5% 7% 9% 39%	1980
	11th to 20th	Day	15% 6% 2 5% 7% 4 5% 5% 6% 7% 38%	1980
	21st to end	Day	12% 6% 2 5% 4 3 5% 5% 6% 8% 44%	1980
October	1st to 10th	Day	12% 4 2 5% 4 3 4 4 5% 6% 52%	1980
	11th to 20th	Day	12% 6% 2 4 5% 2 3 3 4 6% 52%	1819
	21st to end	Day	13% 6% 2 4 4 3 4 3 6% 7% 49%	1980
November	1st to 10th	Day	10% 6% 3 4 4 2 3 3 4 7% 55%	1690
	11th to 20th	Day	10% 8% 2 5% 5% 3 4 5% 5% 7% 47%	1710
	21st to end	Day	10% 9% 4 6% 5% 3 3 4 6% 6% 44%	1710
December	1st to 10th	Day	14% 12% 4 7% 5% 3 4 5% 6% 7% 33%	1710
	11th to 20th	Day	11% 13% 3 6% 5% 4 5% 5% 6% 6% 37%	2153
	21st to end	Day	10% 12% 4 7% 7% 5% 5% 5% 5% 6% 34%	3124
January	1st to 10th	Night	14% 10% 4 9% 6% 3 5% 5% 5% 6% 33%	2459
	11th to 20th	Night	15% 11% 4 8% 7% 3 5% 5% 6% 7% 28%	2367
	21st to end	Night	13% 11% 5% 7% 6% 3 5% 5% 4 5% 37%	2574
February	1st to 10th	Night	14% 11% 4 6% 5% 4 4 5% 6% 7% 35%	2196
	11th to 20th	Night	18% 11% 4 7% 6% 3 4 4 5% 5% 33%	2098
	21st to end	Night	17% 10% 4 6% 7% 3 5% 4 6% 6% 31%	1776
March	1st to 10th	Night	13% 12% 4 7% 5% 3 4 4 4 6% 39%	2081
	11th to 20th	Night	15% 11% 4 6% 5% 3 5% 5% 5% 6% 34%	1980
	21st to end	Night	15% 9% 3 5% 6% 3 6% 5% 6% 7% 36%	2178
April	1st to 10th	Night	13% 7% 2 4 5% 2 5% 5% 5% 7% 45%	1976
	11th to 20th	Night	12% 9% 3 5% 4 3 4 4 5% 6% 46%	1736
	21st to end	Night	14% 4 2 5% 5% 3 5% 6% 5% 7% 44%	1620
May	1st to 10th	Night	13% 5% 3 6% 5% 3 6% 5% 6% 9% 39%	1620
	11th to 20th	Night	14% 7% 2 5% 6% 3 5% 6% 7% 9% 36%	1592
	21st to end	Night	9% 5% 3 5% 6% 4 7% 6% 7% 10% 38%	1744
June	1st to 10th	Night	7% 4 3 5% 6% 3 7% 8% 8% 12% 36%	1620
	11th to 20th	Night	4 4 2 6% 5% 2 5% 6% 10% 14% 42%	1620
	21st to end	Night	6% 5% 2 5% 6% 4 6% 7% 7% 11% 40%	1620
July	1st to 10th	Night	10% 6% 4 7% 6% 4 7% 6% 7% 10% 34%	1620
	11th to 20th	Night	8% 5% 2 5% 6% 3 5% 6% 8% 12% 39%	1620
	21st to end	Night	8% 5% 2 5% 6% 4 8% 7% 8% 12% 34%	1771
August	1st to 10th	Night	8% 5% 3 5% 6% 3 6% 7% 7% 9% 40%	1611
	11th to 20th	Night	9% 6% 3 6% 7% 5% 6% 6% 6% 10% 36%	1602
	21st to end	Night	10% 5% 3 7% 6% 4 4 6% 7% 10% 38%	1980
September	1st to 10th	Night	11% 6% 2 5% 5% 3 5% 6% 5% 8% 43%	1970
	11th to 20th	Night	13% 7% 3 5% 5% 3 5% 5% 5% 7% 42%	1980
	21st to end	Night	11% 6% 2 5% 5% 3 4 4 5% 7% 48%	1980
October	1st to 10th	Night	15% 5% 2 4 3 2 3 3 3 6% 53%	1980
	11th to 20th	Night	15% 6% 2 4 4 3 4 4 4 6% 50%	2139
	21st to end	Night	13% 6% 2 3 4 2 3 4 6% 6% 50%	2376
November	1st to 10th	Night	14% 6% 2 4 4 2 3 3 4 6% 52%	2385
	11th to 20th	Night	13% 7% 3 6% 4 2 3 4 6% 6% 47%	2470
	21st to end	Night	12% 8% 3 5% 4 2 4 5% 5% 6% 46%	2470
December	1st to 10th	Night	15% 13% 4 7% 6% 3 4 5% 5% 6% 32%	2470
	11th to 20th	Night	15% 11% 4 9% 5% 2 4 4 4 5% 37%	3042
	21st to end	Night	11% 12% 5% 8% 6% 4 5% 7% 7% 8% 28%	4532

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	51% 6% 8% 17% 14% 3	1707
	11th to 20th	Day	55% 6% 8% 17% 13% 2	1638
	21st to end	Day	43% 5% 11% 21% 18% 2	1782
February	1st to 10th	Day	53% 6% 9% 15% 15% 2	1760
	11th to 20th	Day	55% 5% 9% 17% 13% 2	1758
	21st to end	Day	50% 5% 9% 13% 16% 6%	1480
March	1st to 10th	Day	45% 6% 9% 17% 18% 5%	1877
	11th to 20th	Day	50% 8% 11% 15% 14% 3	1980
	21st to end	Day	49% 6% 11% 19% 11% 2	2178
April	1st to 10th	Day	38% 8% 12% 23% 17% 2	1998
	11th to 20th	Day	41% 6% 10% 17% 23% 4	2173
	21st to end	Day	42% 6% 12% 24% 14% 2	2340
May	1st to 10th	Day	42% 8% 13% 22% 12% 3	2340
	11th to 20th	Day	48% 9% 14% 17% 10% 2	2305
	21st to end	Day	41% 12% 15% 20% 12% 1	2531
June	1st to 10th	Day	41% 12% 17% 19% 10% 1	2340
	11th to 20th	Day	39% 11% 20% 16% 11% 2	2340
	21st to end	Day	40% 12% 16% 18% 11% 3	2340
July	1st to 10th	Day	45% 13% 17% 15% 8%	2275
	11th to 20th	Day	44% 13% 17% 13% 10% 3	2271
	21st to end	Day	44% 13% 18% 17% 8%	2405
August	1st to 10th	Day	45% 13% 18% 17% 6%	2314
	11th to 20th	Day	47% 12% 16% 16% 9% 1	2295
	21st to end	Day	46% 12% 15% 15% 9% 3	2366
September	1st to 10th	Day	40% 10% 15% 17% 14% 4	1980
	11th to 20th	Day	44% 9% 11% 19% 15% 2	1980
	21st to end	Day	37% 8% 14% 20% 17% 5%	1980
October	1st to 10th	Day	34% 6% 11% 22% 22% 5%	1980
	11th to 20th	Day	34% 4 10% 23% 23% 6%	1819
	21st to end	Day	36% 4 9% 23% 24% 5%	1980
November	1st to 10th	Day	33% 5% 8% 20% 29% 6%	1690
	11th to 20th	Day	37% 4 9% 22% 24% 5%	1710
	21st to end	Day	40% 5% 8% 23% 20% 4	1710
December	1st to 10th	Day	50% 7% 9% 18% 13% 2	1710
	11th to 20th	Day	46% 6% 12% 16% 18% 3	2150
	21st to end	Day	48% 8% 9% 23% 10% 1	3124
January	1st to 10th	Night	53% 5% 8% 16% 16% 2	2459
	11th to 20th	Night	56% 7% 9% 12% 14% 2	2367
	21st to end	Night	50% 4 8% 19% 17% 2	2574
February	1st to 10th	Night	49% 6% 11% 17% 15% 2	2196
	11th to 20th	Night	54% 5% 8% 16% 13% 3	2099
	21st to end	Night	53% 7% 9% 14% 13% 4	1776
March	1st to 10th	Night	48% 4 9% 15% 19% 5%	2081
	11th to 20th	Night	50% 7% 11% 18% 12% 3	1980
	21st to end	Night	47% 6% 11% 21% 12% 2	2178
April	1st to 10th	Night	37% 7% 13% 23% 17% 3	1976
	11th to 20th	Night	39% 5% 10% 20% 20% 6%	1736
	21st to end	Night	39% 8% 11% 28% 14% 1	1620
May	1st to 10th	Night	42% 7% 16% 22% 11% 2	1620
	11th to 20th	Night	42% 10% 18% 20% 9% 1	1593
	21st to end	Night	38% 12% 15% 24% 10% 1	1745
June	1st to 10th	Night	38% 12% 18% 21% 11% 1	1620
	11th to 20th	Night	29% 14% 22% 24% 11% 1	1620
	21st to end	Night	37% 11% 17% 21% 11% 4	1620
July	1st to 10th	Night	42% 12% 17% 18% 10% 1	1575
	11th to 20th	Night	34% 14% 23% 17% 9% 3	1566
	21st to end	Night	39% 15% 19% 20% 7%	1672
August	1st to 10th	Night	37% 12% 21% 21% 9%	1600
	11th to 20th	Night	42% 13% 17% 18% 10% 1	1602
	21st to end	Night	40% 11% 18% 20% 9% 1	1980
September	1st to 10th	Night	37% 10% 15% 20% 14% 4	1970
	11th to 20th	Night	41% 9% 13% 17% 19% 1	1980
	21st to end	Night	37% 6% 11% 22% 20% 4	1980
October	1st to 10th	Night	35% 5% 10% 19% 25% 5%	1980
	11th to 20th	Night	37% 5% 10% 22% 20% 5%	2139
	21st to end	Night	34% 5% 8% 22% 24% 7%	2376
November	1st to 10th	Night	36% 5% 8% 19% 25% 7%	2385
	11th to 20th	Night	38% 4 7% 20% 23% 7%	2470
	21st to end	Night	40% 5% 9% 23% 20% 4	2470
December	1st to 10th	Night	53% 7% 11% 15% 11% 3	2470
	11th to 20th	Night	50% 5% 8% 15% 20% 3	3044
	21st to end	Night	51% 8% 10% 19% 11% 1	4532

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	21% 28% 31% 17% 2	270
	11th to 20th	Day	26% 28% 28% 16% 2	246
	21st to end	Day	23% 32% 32% 9% 3	264
February	1st to 10th	Day	25% 25% 35% 12% 2 1	240
	11th to 20th	Day	36% 33% 23% 8%	240
	21st to end	Day	36% 28% 26% 9% 1	198
March	1st to 10th	Day	21% 24% 34% 16% 4	317
	11th to 20th	Day	23% 23% 34% 16% 3 1	420
	21st to end	Day	23% 21% 29% 21% 6%	462
April	1st to 10th	Day	18% 22% 27% 23% 10% 1	420
	11th to 20th	Day	20% 19% 27% 21% 12% 2	412
	21st to end	Day	19% 18% 29% 21% 12% 3	420
May	1st to 10th	Day	18% 18% 30% 21% 8% 5%	423
	11th to 20th	Day	15% 10% 25% 24% 17% 9%	447
	21st to end	Day	15% 7% 20% 29% 14% 15%	485
June	1st to 10th	Day	11% 4 26% 29% 18% 12%	450
	11th to 20th	Day	6% 5% 22% 29% 26% 13%	450
	21st to end	Day	10% 5% 25% 26% 22% 12%	450
July	1st to 10th	Day	10% 5% 16% 24% 25% 19%	445
	11th to 20th	Day	10% 4 15% 27% 27% 18%	444
	21st to end	Day	9% 3 12% 34% 27% 16%	488
August	1st to 10th	Day	15% 5% 15% 24% 23% 18%	446
	11th to 20th	Day	8% 5% 15% 32% 27% 13%	439
	21st to end	Day	13% 2 11% 26% 31% 17%	495
September	1st to 10th	Day	8% 5% 11% 28% 34% 13%	450
	11th to 20th	Day	16% 4 12% 25% 32% 12%	450
	21st to end	Day	14% 9% 14% 34% 23% 6%	450
October	1st to 10th	Day	15% 6% 22% 28% 21% 8%	450
	11th to 20th	Day	17% 12% 24% 27% 16% 3	450
	21st to end	Day	20% 10% 26% 30% 12% 3	495
November	1st to 10th	Day	14% 16% 31% 28% 10% 1	288
	11th to 20th	Day	17% 19% 35% 23% 5% 1	270
	21st to end	Day	14% 16% 36% 27% 7%	270
December	1st to 10th	Day	24% 23% 33% 16% 4 1	270
	11th to 20th	Day	23% 14% 35% 23% 4 1	270
	21st to end	Day	23% 21% 36% 16% 5%	297
January	1st to 10th	Night	22% 19% 27% 27% 5%	760
	11th to 20th	Night	23% 19% 30% 22% 5%	729
	21st to end	Night	20% 20% 32% 26% 2	792
February	1st to 10th	Night	20% 17% 30% 30% 3	720
	11th to 20th	Night	25% 18% 37% 19% 1	703
	21st to end	Night	25% 21% 29% 22% 2	592
March	1st to 10th	Night	21% 17% 31% 27% 4	720
	11th to 20th	Night	20% 16% 31% 25% 7% 1	720
	21st to end	Night	20% 14% 28% 27% 9% 1	792
April	1st to 10th	Night	16% 16% 30% 26% 10% 1	716
	11th to 20th	Night	16% 15% 29% 25% 14% 1	533
	21st to end	Night	16% 8% 29% 34% 12% 1	540
May	1st to 10th	Night	14% 10% 27% 30% 15% 3	540
	11th to 20th	Night	15% 5% 21% 34% 22% 3	531
	21st to end	Night	10% 3 15% 30% 35% 7%	584
June	1st to 10th	Night	8% 3 15% 37% 32% 6%	540
	11th to 20th	Night	4 3 13% 35% 34% 11%	540
	21st to end	Night	7% 1 16% 34% 33% 8%	540
July	1st to 10th	Night	11% 2 7% 30% 42% 9%	525
	11th to 20th	Night	9% 2 7% 28% 43% 12%	522
	21st to end	Night	7% 2 10% 29% 41% 10%	591
August	1st to 10th	Night	8% 4 6% 28% 45% 9%	537
	11th to 20th	Night	10% 3 7% 33% 42% 5%	534
	21st to end	Night	11% 2 7% 27% 42% 11%	594
September	1st to 10th	Night	11% 4 8% 27% 41% 9%	710
	11th to 20th	Night	16% 4 9% 28% 36% 7%	720
	21st to end	Night	13% 3 17% 33% 32% 2	720
October	1st to 10th	Night	18% 6% 15% 24% 29% 9%	720
	11th to 20th	Night	18% 8% 23% 31% 17% 3	720
	21st to end	Night	16% 9% 22% 35% 15% 3	792
November	1st to 10th	Night	18% 9% 16% 35% 19% 4	740
	11th to 20th	Night	16% 13% 24% 34% 12% 1	760
	21st to end	Night	18% 11% 24% 33% 14% 1	760
December	1st to 10th	Night	23% 14% 28% 28% 7%	760
	11th to 20th	Night	21% 12% 26% 32% 8% 1	760
	21st to end	Night	22% 16% 25% 33% 5%	836

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