Cades Cove
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Cades Cove clear sky chart from 2005-11-06 to 2024-12-09.

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	14% 9% 3 7% 5% 5% 5% 4 6% 7% 35%	101327
	Night	14% 9% 3 7% 5% 4 4 4 5% 7% 37%	98423
Transparency	Day	24% 48% 7% 12% 8% 2	105133
	Night	24% 48% 7% 11% 8% 3	102755
Seeing	Day	21% 13% 25% 23% 14% 5%	14982
	Night	19% 11% 21% 28% 17% 3	25040

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	15% 12% 7% 9% 5% 4 4 4 6% 6% 29%	2836
	11th to 20th	Day	16% 14% 7% 9% 5% 4 4 3 4 4 30%	2840
	21st to end	Day	18% 15% 6% 7% 4 3 3 3 4 5% 32%	3124
February	1st to 10th	Day	18% 13% 5% 7% 4 4 4 4 5% 4 32%	1885
	11th to 20th	Day	22% 12% 4 9% 3 3 3 2 4 5% 32%	1848
	21st to end	Day	20% 13% 2 7% 5% 3 3 3 5% 4 34%	1570
March	1st to 10th	Day	21% 11% 5% 5% 4 4 4 2 4 6% 33%	3238
	11th to 20th	Day	15% 9% 2 6% 3 4 3 3 4 5% 46%	3480
	21st to end	Day	18% 11% 2 6% 5% 4 4 3 5% 5% 37%	3815
April	1st to 10th	Day	12% 9% 2 7% 5% 5% 6% 4 6% 6% 39%	2133
	11th to 20th	Day	16% 8% 3 6% 4 4 4 3 6% 6% 41%	2276
	21st to end	Day	16% 8% 2 6% 5% 4 5% 4 5% 6% 39%	2470
May	1st to 10th	Day	16% 8% 3 8% 5% 6% 5% 4 5% 7% 32%	4082
	11th to 20th	Day	19% 9% 3 9% 6% 6% 5% 4 5% 6% 29%	4081
	21st to end	Day	11% 6% 2 7% 5% 5% 6% 5% 8% 10% 34%	4476
June	1st to 10th	Day	11% 6% 2 8% 6% 6% 7% 5% 7% 9% 32%	2470
	11th to 20th	Day	6% 6% 2 9% 7% 6% 7% 6% 7% 9% 36%	2470
	21st to end	Day	10% 7% 3 8% 6% 5% 6% 5% 9% 9% 33%	2470
July	1st to 10th	Day	7% 6% 2 8% 6% 6% 7% 6% 9% 11% 30%	4120
	11th to 20th	Day	12% 6% 3 7% 5% 6% 6% 5% 7% 8% 34%	4120
	21st to end	Day	16% 11% 5% 12% 9% 8% 7% 5% 5% 6% 16%	4466
August	1st to 10th	Day	9% 5% 3 8% 6% 6% 7% 5% 8% 12% 32%	4104
	11th to 20th	Day	10% 6% 3 8% 5% 5% 6% 6% 8% 11% 32%	3961
	21st to end	Day	8% 5% 2 6% 6% 5% 6% 4 7% 7% 45%	4180
September	1st to 10th	Day	13% 6% 3 8% 5% 5% 6% 4 6% 8% 36%	2091
	11th to 20th	Day	15% 6% 3 8% 5% 5% 5% 4 6% 7% 36%	2090
	21st to end	Day	15% 6% 2 6% 4 5% 5% 3 7% 7% 41%	2090
October	1st to 10th	Day	12% 6% 2 5% 4 4 4 4 4 6% 50%	2090
	11th to 20th	Day	14% 7% 2 5% 3 2 4 3 4 6% 51%	1938
	21st to end	Day	15% 6% 2 4 3 3 3 3 5% 6% 50%	2090
November	1st to 10th	Day	12% 6% 2 5% 3 3 3 3 5% 5% 53%	1764
	11th to 20th	Day	11% 9% 3 6% 3 3 4 4 5% 6% 45%	1800
	21st to end	Day	13% 10% 4 6% 4 4 4 4 5% 5% 43%	1800
December	1st to 10th	Day	19% 11% 4 7% 4 4 4 5% 4 5% 33%	1782
	11th to 20th	Day	15% 12% 5% 7% 4 3 4 3 5% 6% 36%	2153
	21st to end	Day	13% 14% 6% 8% 5% 4 5% 3 4 5% 33%	3124
January	1st to 10th	Night	15% 17% 5% 9% 4 4 4 3 3 5% 31%	4109
	11th to 20th	Night	20% 12% 4 7% 5% 5% 5% 3 4 4 32%	4120
	21st to end	Night	19% 15% 4 8% 4 4 3 3 3 4 33%	4532
February	1st to 10th	Night	16% 11% 3 8% 5% 3 4 3 5% 5% 35%	2290
	11th to 20th	Night	22% 12% 4 7% 4 4 4 3 3 4 33%	2218
	21st to end	Night	21% 13% 4 6% 4 4 4 3 5% 5% 31%	1884
March	1st to 10th	Night	22% 14% 4 6% 4 4 4 3 4 7% 29%	3613
	11th to 20th	Night	15% 7% 3 5% 4 3 4 3 6% 7% 44%	3480
	21st to end	Night	15% 10% 3 7% 4 4 4 4 4 6% 39%	3817
April	1st to 10th	Night	15% 10% 2 5% 4 4 3 3 5% 7% 43%	2062
	11th to 20th	Night	14% 9% 3 5% 4 4 3 3 5% 7% 43%	1851
	21st to end	Night	16% 6% 2 5% 4 4 4 4 5% 7% 42%	1710
May	1st to 10th	Night	15% 7% 3 8% 6% 5% 5% 4 6% 8% 33%	2813
	11th to 20th	Night	20% 7% 2 7% 4 4 5% 4 6% 7% 34%	2812
	21st to end	Night	9% 7% 2 6% 6% 5% 5% 4 7% 11% 36%	3079
June	1st to 10th	Night	10% 6% 2 5% 6% 6% 6% 5% 8% 10% 37%	1710
	11th to 20th	Night	5% 3 2 5% 4 5% 6% 6% 9% 12% 42%	1710
	21st to end	Night	9% 7% 2 6% 5% 5% 5% 6% 6% 9% 39%	1710
July	1st to 10th	Night	10% 7% 3 7% 6% 7% 6% 5% 8% 9% 32%	2840
	11th to 20th	Night	9% 6% 2 5% 4 5% 5% 5% 9% 11% 39%	2840
	21st to end	Night	13% 10% 4 11% 8% 7% 6% 5% 8% 8% 21%	3087
August	1st to 10th	Night	8% 6% 2 7% 6% 5% 5% 5% 7% 11% 39%	2825
	11th to 20th	Night	13% 6% 3 6% 4 5% 5% 5% 6% 9% 38%	2864
	21st to end	Night	7% 5% 3 6% 4 4 5% 5% 8% 10% 45%	3476
September	1st to 10th	Night	11% 6% 3 7% 6% 5% 4 3 6% 8% 41%	2068
	11th to 20th	Night	14% 7% 3 6% 5% 4 4 4 6% 8% 40%	2090
	21st to end	Night	13% 6% 2 6% 5% 4 4 4 5% 7% 45%	2090
October	1st to 10th	Night	14% 6% 2 4 3 3 2 3 3 7% 53%	2090
	11th to 20th	Night	16% 6% 2 5% 4 3 3 3 3 4 51%	2239
	21st to end	Night	13% 7% 1 5% 3 3 4 3 5% 6% 51%	2508
November	1st to 10th	Night	13% 7% 2 5% 4 3 3 3 4 5% 49%	2531
	11th to 20th	Night	15% 9% 3 6% 4 3 4 3 5% 5% 45%	2600
	21st to end	Night	14% 10% 2 6% 3 3 3 3 5% 6% 43%	2600
December	1st to 10th	Night	19% 13% 4 9% 5% 3 4 3 4 6% 31%	2581
	11th to 20th	Night	15% 13% 5% 10% 4 3 3 2 4 5% 36%	3042
	21st to end	Night	15% 15% 6% 8% 6% 5% 5% 4 6% 7% 25%	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	32% 36% 7% 7% 14% 4	2837
	11th to 20th	Day	34% 37% 6% 6% 14% 4	2840
	21st to end	Day	36% 39% 4 7% 11% 2	3124
February	1st to 10th	Day	20% 65% 2 6% 5% 1	1885
	11th to 20th	Day	22% 64% 1 6% 6% 1	1858
	21st to end	Day	20% 64% 2 5% 6% 2	1570
March	1st to 10th	Day	35% 41% 3 11% 6% 5%	3238
	11th to 20th	Day	20% 40% 4 15% 15% 7%	3480
	21st to end	Day	29% 40% 4 18% 6% 3	3815
April	1st to 10th	Day	18% 66% 3 7% 6%	2133
	11th to 20th	Day	18% 66% 3 7% 5% 1	2276
	21st to end	Day	15% 65% 3 11% 5% 1	2470
May	1st to 10th	Day	32% 43% 6% 14% 4	4120
	11th to 20th	Day	33% 43% 7% 15% 3	4085
	21st to end	Day	25% 44% 8% 14% 9%	4489
June	1st to 10th	Day	17% 66% 5% 7% 4	2470
	11th to 20th	Day	14% 67% 8% 7% 3	2470
	21st to end	Day	16% 66% 7% 7% 3	2470
July	1st to 10th	Day	22% 45% 16% 13% 4	4055
	11th to 20th	Day	27% 40% 15% 16% 2	4051
	21st to end	Day	48% 39% 5% 5% 2	4324
August	1st to 10th	Day	24% 42% 14% 16% 3	4091
	11th to 20th	Day	21% 42% 19% 11% 7%	4000
	21st to end	Day	17% 40% 10% 27% 4 1	4179
September	1st to 10th	Day	16% 62% 5% 9% 8% 1	2091
	11th to 20th	Day	17% 61% 6% 9% 6%	2090
	21st to end	Day	16% 61% 7% 9% 6%	2090
October	1st to 10th	Day	15% 39% 5% 11% 21% 10%	3480
	11th to 20th	Day	12% 37% 3 14% 20% 14%	3204
	21st to end	Day	12% 38% 5% 21% 15% 8%	3428
November	1st to 10th	Day	18% 56% 4 9% 10% 2	1764
	11th to 20th	Day	18% 57% 2 9% 11% 3	1800
	21st to end	Day	19% 58% 3 10% 8% 2	1800
December	1st to 10th	Day	24% 58% 3 8% 5% 2	1782
	11th to 20th	Day	24% 48% 6% 6% 12% 4	2150
	21st to end	Day	35% 37% 6% 13% 8% 1	3124
January	1st to 10th	Night	37% 36% 5% 5% 12% 4	4109
	11th to 20th	Night	32% 37% 4 7% 14% 6%	4120
	21st to end	Night	37% 39% 4 5% 11% 5%	4532
February	1st to 10th	Night	19% 65% 2 7% 5% 2	2290
	11th to 20th	Night	22% 64% 2 5% 5% 1	2219
	21st to end	Night	18% 65% 4 6% 5% 3	1884
March	1st to 10th	Night	38% 44% 6% 5% 6% 1	3613
	11th to 20th	Night	20% 40% 5% 16% 12% 7%	3480
	21st to end	Night	28% 41% 5% 14% 10% 3	3817
April	1st to 10th	Night	17% 65% 4 7% 6% 1	2062
	11th to 20th	Night	17% 65% 4 7% 4 2	1851
	21st to end	Night	14% 65% 3 12% 5% 1	1710
May	1st to 10th	Night	31% 44% 7% 15% 3	2840
	11th to 20th	Night	31% 43% 8% 14% 5%	2813
	21st to end	Night	22% 45% 11% 16% 6%	3087
June	1st to 10th	Night	14% 66% 7% 8% 3 1	1710
	11th to 20th	Night	10% 68% 10% 9% 3	1710
	21st to end	Night	14% 66% 7% 9% 3	1710
July	1st to 10th	Night	27% 43% 15% 13% 2	2795
	11th to 20th	Night	21% 40% 20% 18% 2 1	2786
	21st to end	Night	42% 41% 8% 6% 2	2988
August	1st to 10th	Night	23% 41% 14% 16% 5%	2814
	11th to 20th	Night	22% 41% 19% 12% 6%	2891
	21st to end	Night	14% 42% 13% 27% 5%	3476
September	1st to 10th	Night	14% 61% 6% 9% 8% 1	2068
	11th to 20th	Night	15% 62% 7% 9% 7%	2090
	21st to end	Night	16% 62% 7% 9% 7%	2090
October	1st to 10th	Night	16% 39% 6% 14% 16% 10%	3480
	11th to 20th	Night	15% 37% 2 14% 16% 16%	3712
	21st to end	Night	11% 37% 3 21% 17% 11%	4120
November	1st to 10th	Night	20% 56% 4 9% 9% 1	2531
	11th to 20th	Night	19% 57% 2 9% 10% 4	2600
	21st to end	Night	19% 57% 3 11% 9% 1	2600
December	1st to 10th	Night	27% 58% 3 6% 5% 2	2581
	11th to 20th	Night	26% 49% 3 6% 13% 4	3044
	21st to end	Night	38% 38% 6% 9% 7% 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	31% 27% 32% 9% 1	270
	11th to 20th	Day	34% 28% 25% 13% 1	270
	21st to end	Day	26% 32% 33% 9%	297
February	1st to 10th	Day	30% 25% 35% 9% 1	270
	11th to 20th	Day	46% 23% 26% 5%	270
	21st to end	Day	45% 26% 23% 5%	225
March	1st to 10th	Day	30% 20% 34% 13% 4	336
	11th to 20th	Day	30% 22% 32% 10% 4 1	460
	21st to end	Day	29% 22% 28% 17% 4	506
April	1st to 10th	Day	28% 19% 26% 19% 7% 1	460
	11th to 20th	Day	23% 21% 29% 18% 7% 2	452
	21st to end	Day	26% 16% 26% 20% 8% 3	460
May	1st to 10th	Day	22% 18% 30% 17% 9% 3	463
	11th to 20th	Day	17% 13% 26% 27% 11% 5%	487
	21st to end	Day	17% 8% 22% 27% 17% 8%	529
June	1st to 10th	Day	13% 10% 23% 30% 19% 6%	490
	11th to 20th	Day	9% 7% 20% 31% 24% 9%	490
	21st to end	Day	14% 6% 25% 30% 17% 8%	490
July	1st to 10th	Day	13% 4 16% 29% 26% 11%	485
	11th to 20th	Day	14% 6% 12% 30% 25% 13%	484
	21st to end	Day	13% 4 15% 30% 27% 11%	532
August	1st to 10th	Day	17% 7% 18% 24% 22% 11%	486
	11th to 20th	Day	13% 5% 18% 31% 26% 7%	479
	21st to end	Day	14% 3 12% 29% 29% 14%	539
September	1st to 10th	Day	11% 4 18% 29% 30% 8%	490
	11th to 20th	Day	16% 6% 15% 29% 23% 10%	490
	21st to end	Day	19% 6% 19% 35% 17% 4	490
October	1st to 10th	Day	15% 9% 26% 26% 18% 6%	490
	11th to 20th	Day	20% 12% 28% 27% 13% 2	490
	21st to end	Day	22% 9% 29% 27% 11% 3	539
November	1st to 10th	Day	19% 17% 30% 25% 8% 1	302
	11th to 20th	Day	23% 21% 32% 21% 3	300
	21st to end	Day	21% 21% 34% 19% 4	300
December	1st to 10th	Day	32% 20% 32% 14% 1	294
	11th to 20th	Day	26% 18% 38% 16% 2	270
	21st to end	Day	26% 22% 40% 11% 1	297
January	1st to 10th	Night	26% 18% 27% 23% 5%	760
	11th to 20th	Night	29% 20% 27% 20% 4	760
	21st to end	Night	23% 19% 32% 23% 3	836
February	1st to 10th	Night	25% 14% 32% 25% 3	760
	11th to 20th	Night	31% 18% 32% 18% 1	743
	21st to end	Night	33% 20% 25% 19% 2	628
March	1st to 10th	Night	25% 19% 28% 25% 3	760
	11th to 20th	Night	26% 17% 29% 21% 7% 1	760
	21st to end	Night	25% 15% 28% 22% 8%	836
April	1st to 10th	Night	23% 17% 26% 25% 8% 1	732
	11th to 20th	Night	22% 15% 26% 25% 12% 1	563
	21st to end	Night	17% 9% 31% 28% 14% 1	570
May	1st to 10th	Night	17% 10% 26% 31% 13% 2	570
	11th to 20th	Night	16% 8% 20% 33% 19% 3	561
	21st to end	Night	13% 3 16% 36% 28% 5%	617
June	1st to 10th	Night	11% 5% 14% 38% 28% 4	570
	11th to 20th	Night	6% 3 15% 35% 31% 10%	570
	21st to end	Night	11% 2 14% 33% 32% 7%	570
July	1st to 10th	Night	12% 4 6% 32% 41% 6%	555
	11th to 20th	Night	10% 3 7% 30% 40% 10%	552
	21st to end	Night	8% 4 8% 31% 42% 8%	624
August	1st to 10th	Night	10% 4 7% 35% 36% 8%	567
	11th to 20th	Night	12% 4 9% 34% 37% 4	564
	21st to end	Night	12% 4 6% 28% 40% 9%	627
September	1st to 10th	Night	13% 3 10% 30% 37% 7%	738
	11th to 20th	Night	17% 4 9% 35% 30% 6%	760
	21st to end	Night	15% 4 17% 35% 26% 2	760
October	1st to 10th	Night	17% 5% 19% 24% 26% 8%	760
	11th to 20th	Night	19% 9% 23% 31% 16% 3	760
	21st to end	Night	18% 10% 24% 33% 13% 2	836
November	1st to 10th	Night	18% 9% 21% 32% 17% 3	780
	11th to 20th	Night	19% 16% 25% 28% 12% 1	800
	21st to end	Night	23% 11% 28% 26% 12% 1	800
December	1st to 10th	Night	26% 17% 26% 25% 6%	795
	11th to 20th	Night	23% 14% 29% 27% 7% 1	760
	21st to end	Night	27% 15% 27% 27% 4	836

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