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 2024-11-06.

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% 8% 3 7% 5% 5% 5% 4 6% 8% 37%	101062
	Night	13% 8% 3 7% 5% 4 5% 4 6% 7% 39%	97956
Transparency	Day	42% 8% 13% 20% 14% 3	104856
	Night	42% 8% 12% 20% 15% 3	102301
Seeing	Day	16% 13% 24% 24% 15% 7%	14916
	Night	16% 10% 22% 29% 19% 3	24944

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% 11% 6% 11% 5% 4 4 3 8% 7% 30%	2836
	11th to 20th	Day	11% 13% 6% 9% 5% 7% 4 3 4 5% 32%	2840
	21st to end	Day	14% 15% 5% 8% 5% 3 3 3 5% 6% 32%	3124
February	1st to 10th	Day	14% 13% 3 9% 5% 5% 5% 4 5% 5% 33%	1857
	11th to 20th	Day	16% 12% 4 10% 5% 4 3 3 5% 6% 32%	1848
	21st to end	Day	16% 10% 3 8% 5% 5% 4 4 5% 5% 35%	1570
March	1st to 10th	Day	18% 11% 4 6% 4 4 4 3 4 6% 34%	3267
	11th to 20th	Day	12% 8% 3 7% 5% 3 3 3 4 5% 47%	3480
	21st to end	Day	16% 10% 3 6% 5% 4 4 4 5% 6% 38%	3815
April	1st to 10th	Day	10% 8% 1 6% 5% 5% 5% 4 7% 7% 41%	2109
	11th to 20th	Day	14% 7% 2 6% 4 4 4 4 5% 7% 43%	2296
	21st to end	Day	14% 7% 2 6% 5% 5% 5% 4 6% 6% 40%	2470
May	1st to 10th	Day	13% 7% 3 8% 5% 5% 7% 6% 6% 8% 31%	4082
	11th to 20th	Day	15% 8% 3 9% 6% 6% 5% 5% 6% 7% 30%	4081
	21st to end	Day	9% 6% 2 6% 5% 5% 6% 6% 9% 11% 36%	4476
June	1st to 10th	Day	8% 7% 2 7% 7% 6% 7% 5% 8% 10% 34%	2470
	11th to 20th	Day	5% 5% 2 7% 7% 7% 6% 5% 9% 11% 35%	2470
	21st to end	Day	8% 5% 2 7% 6% 6% 7% 6% 8% 10% 35%	2470
July	1st to 10th	Day	7% 5% 2 6% 6% 6% 6% 6% 9% 12% 35%	4120
	11th to 20th	Day	12% 6% 2 6% 5% 5% 5% 5% 8% 9% 37%	4120
	21st to end	Day	13% 8% 4 11% 8% 8% 8% 6% 8% 8% 17%	4466
August	1st to 10th	Day	11% 5% 2 7% 5% 6% 6% 6% 8% 10% 35%	4104
	11th to 20th	Day	11% 5% 2 6% 5% 5% 6% 5% 9% 11% 36%	4022
	21st to end	Day	7% 4 2 6% 5% 5% 5% 4 7% 7% 48%	4156
September	1st to 10th	Day	12% 5% 2 6% 5% 5% 5% 4 7% 9% 39%	2090
	11th to 20th	Day	14% 6% 2 6% 5% 5% 4 4 7% 7% 39%	2090
	21st to end	Day	13% 6% 2 5% 4 4 5% 4 6% 8% 43%	2090
October	1st to 10th	Day	11% 4 2 6% 3 4 4 3 6% 6% 52%	2090
	11th to 20th	Day	11% 6% 2 5% 4 3 3 3 4 6% 53%	1920
	21st to end	Day	13% 6% 1 5% 3 3 3 3 5% 6% 51%	2090
November	1st to 10th	Day	10% 6% 2 5% 4 2 3 2 5% 6% 54%	1736
	11th to 20th	Day	10% 8% 2 5% 4 4 4 4 5% 7% 47%	1710
	21st to end	Day	10% 9% 3 7% 4 4 4 3 6% 5% 44%	1710
December	1st to 10th	Day	14% 12% 4 8% 4 4 4 4 6% 7% 33%	1710
	11th to 20th	Day	11% 13% 3 7% 4 5% 5% 4 6% 6% 36%	2153
	21st to end	Day	10% 12% 4 9% 6% 6% 5% 4 5% 6% 34%	3124
January	1st to 10th	Night	14% 15% 5% 10% 5% 4 4 3 5% 5% 29%	4109
	11th to 20th	Night	15% 12% 3 9% 6% 5% 4 3 5% 5% 34%	4120
	21st to end	Night	16% 12% 4 8% 5% 4 5% 3 4 4 34%	4532
February	1st to 10th	Night	13% 12% 3 7% 4 5% 4 4 6% 6% 36%	2318
	11th to 20th	Night	18% 12% 4 8% 4 5% 4 3 5% 4 33%	2218
	21st to end	Night	17% 11% 3 8% 5% 5% 5% 3 6% 6% 32%	1884
March	1st to 10th	Night	19% 14% 4 8% 4 4 4 3 4 6% 30%	3584
	11th to 20th	Night	13% 8% 2 5% 4 3 4 3 6% 7% 44%	3480
	21st to end	Night	14% 7% 3 5% 5% 5% 5% 4 6% 6% 40%	3817
April	1st to 10th	Night	13% 8% 2 5% 5% 4 4 4 6% 7% 44%	2085
	11th to 20th	Night	12% 9% 2 6% 4 4 3 3 5% 6% 45%	1833
	21st to end	Night	14% 5% 2 6% 4 4 5% 4 5% 7% 44%	1710
May	1st to 10th	Night	12% 7% 3 8% 6% 6% 6% 5% 6% 9% 33%	2813
	11th to 20th	Night	16% 8% 2 7% 5% 4 5% 4 6% 7% 34%	2812
	21st to end	Night	9% 5% 3 6% 5% 5% 6% 5% 7% 10% 38%	3079
June	1st to 10th	Night	7% 5% 2 7% 5% 5% 7% 6% 8% 11% 36%	1710
	11th to 20th	Night	4 4 2 6% 4 4 6% 5% 10% 14% 42%	1710
	21st to end	Night	7% 6% 2 6% 6% 5% 6% 5% 7% 10% 40%	1710
July	1st to 10th	Night	10% 5% 2 6% 5% 5% 7% 6% 8% 11% 34%	2840
	11th to 20th	Night	9% 5% 2 6% 4 4 5% 5% 7% 10% 43%	2840
	21st to end	Night	12% 8% 3 9% 7% 7% 7% 6% 7% 10% 23%	3087
August	1st to 10th	Night	10% 5% 2 7% 5% 5% 6% 4 7% 10% 39%	2825
	11th to 20th	Night	12% 5% 2 6% 4 5% 5% 4 6% 9% 41%	2803
	21st to end	Night	6% 4 2 6% 4 4 5% 4 7% 10% 49%	3476
September	1st to 10th	Night	11% 6% 2 6% 5% 4 5% 5% 5% 7% 43%	2080
	11th to 20th	Night	12% 7% 3 6% 4 4 5% 4 5% 7% 42%	2090
	21st to end	Night	11% 7% 2 5% 5% 4 4 3 5% 7% 47%	2090
October	1st to 10th	Night	14% 6% 2 5% 3 3 3 2 3 6% 54%	2090
	11th to 20th	Night	15% 6% 2 4 3 3 3 2 4 6% 51%	2258
	21st to end	Night	13% 6% 2 3 4 3 3 3 5% 6% 51%	2508
November	1st to 10th	Night	14% 6% 2 5% 4 3 3 3 5% 6% 51%	2461
	11th to 20th	Night	12% 8% 3 6% 3 3 3 3 6% 7% 46%	2470
	21st to end	Night	12% 8% 3 6% 4 3 4 4 5% 6% 45%	2470
December	1st to 10th	Night	15% 13% 3 8% 5% 4 4 4 5% 6% 31%	2470
	11th to 20th	Night	15% 12% 4 10% 4 3 4 3 4 5% 36%	3042
	21st to end	Night	11% 12% 4 9% 5% 5% 5% 6% 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	49% 8% 9% 17% 15% 2	2837
	11th to 20th	Day	52% 8% 8% 13% 18% 1	2840
	21st to end	Day	52% 6% 8% 19% 15% 1	3124
February	1st to 10th	Day	52% 6% 8% 15% 17% 2	1857
	11th to 20th	Day	54% 4 8% 16% 15% 2	1858
	21st to end	Day	50% 5% 9% 13% 17% 6%	1570
March	1st to 10th	Day	49% 6% 10% 15% 14% 6%	3267
	11th to 20th	Day	39% 7% 8% 21% 20% 6%	3480
	21st to end	Day	47% 5% 9% 26% 11% 2	3815
April	1st to 10th	Day	39% 8% 11% 22% 17% 2	2109
	11th to 20th	Day	41% 6% 9% 17% 23% 4	2296
	21st to end	Day	42% 7% 12% 24% 14% 2	2470
May	1st to 10th	Day	48% 10% 11% 20% 10% 2	4120
	11th to 20th	Day	51% 9% 11% 22% 7% 1	4085
	21st to end	Day	37% 11% 16% 19% 16% 2	4489
June	1st to 10th	Day	42% 11% 17% 18% 10% 2	2470
	11th to 20th	Day	38% 11% 20% 16% 12% 2	2470
	21st to end	Day	39% 12% 16% 17% 12% 3	2470
July	1st to 10th	Day	35% 15% 23% 19% 7%	4055
	11th to 20th	Day	40% 11% 20% 21% 6% 2	4051
	21st to end	Day	60% 12% 13% 10% 4	4324
August	1st to 10th	Day	38% 13% 18% 22% 8%	4091
	11th to 20th	Day	36% 12% 22% 20% 8% 1	4061
	21st to end	Day	31% 10% 14% 33% 10% 1	4156
September	1st to 10th	Day	39% 10% 15% 16% 15% 5%	2090
	11th to 20th	Day	43% 9% 11% 20% 16% 2	2090
	21st to end	Day	37% 8% 14% 19% 17% 4	2090
October	1st to 10th	Day	25% 6% 10% 19% 29% 11%	3480
	11th to 20th	Day	24% 4 7% 24% 26% 15%	3173
	21st to end	Day	25% 4 9% 28% 24% 10%	3428
November	1st to 10th	Day	32% 5% 8% 20% 29% 6%	1736
	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	55% 5% 8% 16% 15% 1	4109
	11th to 20th	Night	50% 6% 7% 14% 19% 4	4120
	21st to end	Night	54% 5% 8% 15% 17% 1	4532
February	1st to 10th	Night	48% 6% 11% 17% 16% 2	2318
	11th to 20th	Night	54% 5% 8% 16% 14% 4	2219
	21st to end	Night	52% 6% 9% 14% 14% 5%	1884
March	1st to 10th	Night	55% 5% 8% 14% 15% 3	3584
	11th to 20th	Night	38% 5% 10% 22% 16% 8%	3480
	21st to end	Night	43% 6% 9% 24% 15% 2	3817
April	1st to 10th	Night	38% 7% 13% 23% 17% 3	2085
	11th to 20th	Night	40% 5% 10% 19% 20% 6%	1833
	21st to end	Night	38% 8% 11% 27% 14% 1	1710
May	1st to 10th	Night	45% 10% 15% 20% 9% 1	2840
	11th to 20th	Night	47% 8% 15% 20% 9%	2813
	21st to end	Night	35% 12% 16% 24% 12% 1	3087
June	1st to 10th	Night	38% 13% 18% 21% 11% 1	1710
	11th to 20th	Night	29% 14% 21% 24% 11% 1	1710
	21st to end	Night	36% 12% 16% 21% 12% 4	1710
July	1st to 10th	Night	40% 14% 20% 18% 8%	2795
	11th to 20th	Night	33% 12% 24% 23% 6% 2	2786
	21st to end	Night	54% 14% 15% 12% 4	2988
August	1st to 10th	Night	36% 13% 20% 23% 8%	2814
	11th to 20th	Night	36% 11% 22% 22% 8%	2830
	21st to end	Night	27% 11% 16% 34% 11% 1	3476
September	1st to 10th	Night	37% 10% 15% 19% 14% 4	2080
	11th to 20th	Night	41% 9% 13% 18% 18% 1	2090
	21st to end	Night	38% 7% 11% 21% 19% 4	2090
October	1st to 10th	Night	28% 7% 10% 19% 28% 8%	3480
	11th to 20th	Night	26% 4 8% 21% 26% 14%	3744
	21st to end	Night	23% 4 6% 28% 25% 13%	4120
November	1st to 10th	Night	36% 5% 9% 20% 25% 6%	2461
	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	29% 28% 26% 15% 2	270
	21st to end	Day	23% 30% 33% 11% 3	297
February	1st to 10th	Day	24% 22% 36% 14% 3 1	270
	11th to 20th	Day	34% 32% 24% 10%	270
	21st to end	Day	38% 28% 26% 8%	225
March	1st to 10th	Day	24% 23% 33% 16% 5% 1	352
	11th to 20th	Day	23% 23% 34% 16% 3 1	460
	21st to end	Day	24% 21% 29% 20% 6%	506
April	1st to 10th	Day	20% 22% 27% 21% 9% 1	460
	11th to 20th	Day	21% 19% 27% 21% 11% 2	452
	21st to end	Day	18% 18% 29% 21% 12% 3	460
May	1st to 10th	Day	17% 18% 30% 22% 8% 5%	463
	11th to 20th	Day	15% 10% 25% 25% 17% 8%	487
	21st to end	Day	14% 8% 21% 29% 14% 14%	529
June	1st to 10th	Day	10% 6% 27% 29% 17% 11%	490
	11th to 20th	Day	5% 4 22% 30% 27% 13%	490
	21st to end	Day	10% 5% 24% 28% 21% 12%	490
July	1st to 10th	Day	9% 5% 16% 25% 25% 18%	485
	11th to 20th	Day	10% 5% 15% 28% 26% 17%	484
	21st to end	Day	9% 4 13% 34% 26% 15%	532
August	1st to 10th	Day	15% 5% 16% 25% 22% 17%	486
	11th to 20th	Day	8% 5% 18% 31% 26% 12%	479
	21st to end	Day	12% 2 10% 26% 31% 19%	539
September	1st to 10th	Day	8% 6% 12% 30% 33% 12%	490
	11th to 20th	Day	15% 4 13% 26% 31% 11%	490
	21st to end	Day	14% 10% 14% 34% 22% 6%	490
October	1st to 10th	Day	14% 6% 22% 29% 21% 8%	490
	11th to 20th	Day	16% 12% 24% 29% 16% 3	490
	21st to end	Day	18% 9% 24% 31% 14% 3	539
November	1st to 10th	Day	13% 15% 30% 30% 10% 1	304
	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	24% 19% 29% 22% 5%	760
	21st to end	Night	20% 19% 32% 26% 2	836
February	1st to 10th	Night	19% 16% 30% 31% 3	760
	11th to 20th	Night	26% 18% 37% 18% 1	743
	21st to end	Night	25% 21% 30% 21% 2	628
March	1st to 10th	Night	22% 16% 31% 26% 5%	760
	11th to 20th	Night	20% 17% 31% 25% 6% 1	760
	21st to end	Night	20% 14% 30% 27% 9% 1	836
April	1st to 10th	Night	17% 16% 31% 26% 9% 1	755
	11th to 20th	Night	17% 15% 29% 25% 13% 1	563
	21st to end	Night	16% 8% 29% 35% 11% 1	570
May	1st to 10th	Night	15% 10% 27% 30% 15% 3	570
	11th to 20th	Night	14% 5% 22% 34% 22% 3	561
	21st to end	Night	10% 4 16% 31% 33% 6%	617
June	1st to 10th	Night	8% 4 16% 37% 30% 5%	570
	11th to 20th	Night	4 3 13% 35% 35% 11%	570
	21st to end	Night	7% 2 16% 34% 34% 8%	570
July	1st to 10th	Night	11% 2 7% 30% 42% 9%	555
	11th to 20th	Night	8% 2 7% 28% 44% 11%	552
	21st to end	Night	7% 3 11% 30% 40% 10%	624
August	1st to 10th	Night	8% 4 6% 29% 44% 9%	567
	11th to 20th	Night	10% 3 7% 34% 41% 5%	564
	21st to end	Night	10% 2 7% 26% 43% 11%	627
September	1st to 10th	Night	11% 4 8% 28% 40% 9%	750
	11th to 20th	Night	16% 4 10% 29% 35% 7%	760
	21st to end	Night	13% 4 16% 33% 31% 2	760
October	1st to 10th	Night	17% 6% 14% 26% 29% 9%	760
	11th to 20th	Night	17% 8% 22% 32% 18% 3	760
	21st to end	Night	16% 8% 22% 35% 16% 3	836
November	1st to 10th	Night	17% 8% 16% 36% 18% 4	764
	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

Page generated at 2024-11-03 13:19:02. Version ac07

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