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 2024-01-16.

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% 8% 3 6% 6% 3 5% 5% 6% 7% 35%	74903
	Night	14% 9% 3 6% 5% 3 4 5% 5% 7% 38%	74908
Transparency	Day	31% 39% 7% 11% 10% 2	74626
	Night	30% 38% 7% 12% 10% 2	74704
Seeing	Day	21% 13% 24% 23% 14% 5%	13759
	Night	20% 11% 21% 28% 18% 3	23875

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	18% 9% 5% 8% 7% 3 4 5% 5% 6% 32%	1706
	11th to 20th	Day	19% 14% 4 8% 6% 3 5% 4 4 4 30%	1665
	21st to end	Day	15% 10% 6% 5% 4 3 3 4 5% 6% 39%	1782
February	1st to 10th	Day	19% 12% 6% 7% 5% 3 4 4 5% 4 31%	1786
	11th to 20th	Day	23% 11% 5% 8% 4 2 3 3 4 6% 31%	1748
	21st to end	Day	21% 12% 3 6% 6% 3 3 4 5% 5% 34%	1480
March	1st to 10th	Day	16% 11% 4 4 4 3 4 4 5% 7% 37%	1862
	11th to 20th	Day	19% 11% 3 7% 5% 3 4 4 5% 6% 32%	1980
	21st to end	Day	17% 13% 3 6% 6% 3 5% 4 6% 6% 33%	2178
April	1st to 10th	Day	12% 8% 3 6% 5% 3 6% 5% 6% 7% 41%	2020
	11th to 20th	Day	16% 7% 3 5% 4 2 4 4 6% 7% 41%	2154
	21st to end	Day	16% 7% 3 5% 6% 3 5% 5% 5% 6% 39%	2340
May	1st to 10th	Day	14% 6% 3 6% 6% 3 6% 5% 5% 7% 39%	2340
	11th to 20th	Day	17% 7% 3 7% 7% 5% 5% 5% 5% 7% 32%	2301
	21st to end	Day	13% 7% 3 6% 7% 4 6% 7% 7% 9% 31%	2531
June	1st to 10th	Day	11% 5% 3 7% 7% 4 7% 7% 7% 9% 32%	2340
	11th to 20th	Day	6% 5% 3 7% 8% 5% 7% 7% 7% 9% 35%	2340
	21st to end	Day	10% 6% 3 7% 7% 4 6% 6% 8% 10% 33%	2340
July	1st to 10th	Day	10% 8% 3 8% 8% 5% 7% 8% 8% 9% 26%	2340
	11th to 20th	Day	13% 6% 3 7% 6% 5% 7% 8% 8% 10% 27%	2340
	21st to end	Day	11% 6% 4 7% 8% 6% 8% 8% 7% 9% 27%	2547
August	1st to 10th	Day	12% 6% 3 6% 7% 4 8% 7% 8% 11% 28%	2327
	11th to 20th	Day	12% 7% 3 8% 7% 5% 6% 8% 8% 8% 28%	2262
	21st to end	Day	13% 7% 3 7% 8% 5% 7% 6% 7% 8% 29%	2376
September	1st to 10th	Day	13% 5% 3 7% 6% 4 6% 6% 6% 8% 36%	1981
	11th to 20th	Day	16% 6% 3 7% 7% 4 5% 5% 5% 7% 36%	1980
	21st to end	Day	14% 6% 2 5% 5% 4 5% 5% 7% 7% 42%	1980
October	1st to 10th	Day	12% 6% 2 4 4 3 4 5% 4 6% 49%	1980
	11th to 20th	Day	15% 7% 2 5% 3 2 3 4 4 6% 49%	1836
	21st to end	Day	16% 6% 2 3 3 3 4 4 5% 6% 48%	1980
November	1st to 10th	Day	12% 6% 2 4 3 2 3 4 5% 5% 54%	1674
	11th to 20th	Day	11% 9% 3 5% 4 2 4 5% 5% 6% 46%	1710
	21st to end	Day	13% 9% 4 5% 4 2 5% 5% 5% 5% 43%	1710
December	1st to 10th	Day	19% 11% 5% 7% 5% 3 5% 5% 4 5% 32%	1710
	11th to 20th	Day	15% 12% 5% 6% 5% 2 4 5% 5% 6% 36%	2153
	21st to end	Day	13% 14% 6% 7% 6% 3 5% 4 4 5% 34%	3124
January	1st to 10th	Night	18% 11% 4 8% 6% 2 5% 4 3 6% 34%	2459
	11th to 20th	Night	20% 12% 5% 8% 6% 3 4 5% 5% 5% 28%	2417
	21st to end	Night	15% 13% 5% 8% 6% 3 4 3 4 4 37%	2574
February	1st to 10th	Night	17% 11% 4 7% 5% 3 4 4 5% 5% 34%	2169
	11th to 20th	Night	22% 11% 5% 6% 5% 3 4 4 3 4 33%	2098
	21st to end	Night	22% 12% 5% 6% 5% 3 4 4 5% 5% 30%	1776
March	1st to 10th	Night	16% 12% 5% 6% 4 3 4 3 4 5% 39%	2096
	11th to 20th	Night	18% 10% 4 6% 5% 3 4 5% 5% 7% 33%	1980
	21st to end	Night	17% 11% 4 6% 5% 3 4 5% 5% 6% 35%	2178
April	1st to 10th	Night	14% 8% 3 4 5% 3 3 4 5% 6% 45%	1954
	11th to 20th	Night	13% 8% 3 4 4 3 4 4 5% 7% 44%	1753
	21st to end	Night	17% 5% 2 5% 4 4 3 5% 5% 7% 42%	1620
May	1st to 10th	Night	14% 5% 3 6% 6% 4 5% 6% 5% 7% 39%	1620
	11th to 20th	Night	15% 6% 3 5% 5% 4 5% 6% 7% 8% 36%	1592
	21st to end	Night	8% 7% 3 6% 7% 5% 5% 6% 6% 11% 37%	1744
June	1st to 10th	Night	10% 6% 2 5% 6% 4 6% 6% 7% 10% 37%	1620
	11th to 20th	Night	5% 3 2 4 5% 4 6% 8% 8% 13% 43%	1620
	21st to end	Night	9% 6% 3 5% 5% 3 5% 7% 6% 10% 40%	1620
July	1st to 10th	Night	10% 7% 3 6% 6% 5% 8% 6% 7% 9% 32%	1620
	11th to 20th	Night	9% 5% 3 5% 5% 4 6% 7% 9% 13% 36%	1620
	21st to end	Night	8% 5% 2 6% 7% 4 6% 7% 10% 11% 34%	1771
August	1st to 10th	Night	10% 5% 2 5% 7% 3 6% 6% 7% 10% 40%	1611
	11th to 20th	Night	11% 6% 3 6% 5% 4 6% 7% 7% 9% 35%	1635
	21st to end	Night	11% 6% 4 6% 5% 4 4 6% 8% 9% 36%	1980
September	1st to 10th	Night	11% 6% 3 6% 7% 4 4 5% 6% 8% 41%	1959
	11th to 20th	Night	14% 7% 3 5% 5% 3 3 5% 6% 8% 41%	1980
	21st to end	Night	13% 5% 2 5% 6% 3 4 5% 5% 7% 46%	1980
October	1st to 10th	Night	14% 6% 2 4 3 2 2 3 3 6% 53%	1980
	11th to 20th	Night	17% 5% 3 4 4 3 3 4 3 4 49%	2121
	21st to end	Night	14% 7% 1 4 3 2 4 4 5% 6% 50%	2376
November	1st to 10th	Night	14% 7% 2 5% 4 2 3 3 3 5% 50%	2401
	11th to 20th	Night	15% 8% 3 5% 4 2 3 4 4 5% 46%	2470
	21st to end	Night	14% 9% 3 6% 4 3 3 4 4 6% 43%	2470
December	1st to 10th	Night	19% 12% 4 7% 6% 2 4 4 4 6% 30%	2470
	11th to 20th	Night	16% 12% 5% 9% 5% 2 3 3 4 5% 36%	3042
	21st to end	Night	15% 14% 6% 7% 6% 4 5% 5% 5% 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	35% 39% 5% 10% 8% 2	1707
	11th to 20th	Day	36% 41% 4 8% 8% 2	1665
	21st to end	Day	31% 37% 6% 13% 10% 3	1782
February	1st to 10th	Day	35% 37% 5% 10% 11% 3	1786
	11th to 20th	Day	35% 37% 5% 11% 9% 3	1758
	21st to end	Day	34% 36% 7% 8% 11% 4	1480
March	1st to 10th	Day	29% 37% 6% 11% 14% 4	1862
	11th to 20th	Day	37% 38% 7% 8% 7% 3	1980
	21st to end	Day	36% 38% 7% 12% 7% 1	2178
April	1st to 10th	Day	26% 38% 7% 16% 10% 2	2020
	11th to 20th	Day	26% 36% 6% 12% 17% 3	2154
	21st to end	Day	30% 38% 7% 16% 8% 1	2340
May	1st to 10th	Day	32% 39% 7% 11% 9% 2	2340
	11th to 20th	Day	35% 40% 6% 10% 8% 1	2305
	21st to end	Day	30% 41% 8% 14% 7% 1	2531
June	1st to 10th	Day	30% 42% 10% 13% 4 1	2340
	11th to 20th	Day	29% 40% 10% 12% 7% 1	2340
	21st to end	Day	29% 41% 9% 10% 8% 2	2340
July	1st to 10th	Day	35% 44% 7% 9% 5% 1	2275
	11th to 20th	Day	34% 42% 9% 6% 7% 2	2271
	21st to end	Day	33% 43% 10% 11% 3	2405
August	1st to 10th	Day	32% 42% 9% 13% 4	2314
	11th to 20th	Day	35% 40% 10% 9% 7%	2262
	21st to end	Day	35% 42% 7% 9% 5% 2	2376
September	1st to 10th	Day	33% 40% 6% 10% 9% 2	1981
	11th to 20th	Day	34% 38% 5% 11% 11% 1	1980
	21st to end	Day	27% 38% 6% 11% 13% 4	1980
October	1st to 10th	Day	22% 37% 6% 14% 17% 4	1980
	11th to 20th	Day	26% 37% 4 14% 14% 4	1836
	21st to end	Day	23% 37% 5% 16% 15% 5%	1980
November	1st to 10th	Day	16% 40% 5% 12% 20% 7%	1674
	11th to 20th	Day	24% 41% 5% 13% 14% 5%	1710
	21st to end	Day	26% 40% 5% 11% 15% 4	1710
December	1st to 10th	Day	34% 41% 4 10% 10% 1	1710
	11th to 20th	Day	35% 32% 9% 8% 13% 3	2150
	21st to end	Day	39% 25% 7% 16% 11% 2	3124
January	1st to 10th	Night	34% 40% 5% 10% 9% 2	2459
	11th to 20th	Night	37% 41% 5% 7% 9% 2	2417
	21st to end	Night	36% 37% 4 10% 11% 2	2574
February	1st to 10th	Night	33% 37% 6% 9% 13% 2	2169
	11th to 20th	Night	36% 37% 4 11% 9% 3	2099
	21st to end	Night	39% 36% 4 8% 10% 2	1776
March	1st to 10th	Night	32% 36% 5% 9% 14% 4	2096
	11th to 20th	Night	34% 38% 7% 11% 8% 1	1980
	21st to end	Night	33% 39% 8% 13% 7% 1	2178
April	1st to 10th	Night	27% 37% 7% 15% 12% 1	1954
	11th to 20th	Night	25% 35% 6% 14% 17% 3	1753
	21st to end	Night	27% 39% 8% 17% 7%	1620
May	1st to 10th	Night	31% 39% 10% 11% 8% 1	1620
	11th to 20th	Night	30% 43% 11% 11% 5%	1593
	21st to end	Night	26% 42% 11% 15% 5% 1	1745
June	1st to 10th	Night	27% 42% 11% 14% 5%	1620
	11th to 20th	Night	21% 41% 13% 18% 5% 1	1620
	21st to end	Night	25% 40% 10% 14% 7% 3	1620
July	1st to 10th	Night	32% 41% 10% 10% 7% 1	1575
	11th to 20th	Night	27% 44% 14% 7% 6% 3	1566
	21st to end	Night	25% 45% 14% 12% 4	1672
August	1st to 10th	Night	25% 42% 12% 16% 5%	1600
	11th to 20th	Night	31% 41% 10% 11% 8%	1635
	21st to end	Night	30% 41% 11% 12% 5% 1	1980
September	1st to 10th	Night	31% 39% 9% 10% 8% 3	1959
	11th to 20th	Night	30% 39% 9% 11% 11%	1980
	21st to end	Night	25% 38% 6% 13% 15% 4	1980
October	1st to 10th	Night	22% 36% 7% 11% 19% 4	1980
	11th to 20th	Night	27% 37% 5% 15% 13% 4	2121
	21st to end	Night	23% 38% 4 14% 15% 5%	2376
November	1st to 10th	Night	18% 40% 4 12% 18% 7%	2401
	11th to 20th	Night	25% 39% 5% 12% 14% 5%	2470
	21st to end	Night	27% 40% 4 13% 13% 4	2470
December	1st to 10th	Night	32% 41% 5% 9% 9% 3	2470
	11th to 20th	Night	38% 33% 6% 7% 14% 3	3044
	21st to end	Night	43% 26% 7% 12% 10% 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	32% 28% 26% 13% 1	255
	21st to end	Day	27% 31% 32% 10%	264
February	1st to 10th	Day	31% 27% 33% 8% 1	240
	11th to 20th	Day	47% 24% 25% 4	240
	21st to end	Day	44% 26% 23% 6% 1	198
March	1st to 10th	Day	28% 20% 36% 12% 3	302
	11th to 20th	Day	30% 22% 31% 11% 5% 1	420
	21st to end	Day	28% 21% 28% 18% 5%	462
April	1st to 10th	Day	27% 18% 26% 21% 7% 1	420
	11th to 20th	Day	22% 21% 27% 19% 8% 3	412
	21st to end	Day	26% 16% 25% 21% 9% 3	420
May	1st to 10th	Day	23% 17% 30% 17% 9% 4	423
	11th to 20th	Day	16% 12% 27% 27% 12% 6%	447
	21st to end	Day	18% 8% 19% 28% 18% 9%	485
June	1st to 10th	Day	13% 8% 22% 30% 20% 7%	450
	11th to 20th	Day	10% 7% 18% 31% 24% 10%	450
	21st to end	Day	14% 6% 24% 29% 18% 9%	450
July	1st to 10th	Day	13% 4 16% 28% 27% 12%	445
	11th to 20th	Day	14% 6% 11% 29% 26% 14%	444
	21st to end	Day	12% 2 14% 31% 29% 12%	488
August	1st to 10th	Day	17% 6% 17% 25% 23% 12%	446
	11th to 20th	Day	13% 4 16% 31% 28% 8%	439
	21st to end	Day	15% 4 11% 27% 29% 14%	495
September	1st to 10th	Day	12% 4 15% 29% 32% 8%	450
	11th to 20th	Day	17% 5% 13% 30% 24% 11%	450
	21st to end	Day	18% 6% 17% 37% 18% 4	450
October	1st to 10th	Day	16% 8% 26% 24% 20% 6%	450
	11th to 20th	Day	20% 12% 27% 26% 13% 2	450
	21st to end	Day	24% 9% 27% 26% 11% 3	495
November	1st to 10th	Day	19% 17% 29% 25% 9% 1	272
	11th to 20th	Day	22% 21% 32% 22% 3	270
	21st to end	Day	20% 20% 34% 20% 4	270
December	1st to 10th	Day	32% 19% 33% 15% 1	270
	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% 19% 27% 20% 5%	744
	21st to end	Night	22% 19% 32% 24% 3	792
February	1st to 10th	Night	26% 15% 30% 25% 3	720
	11th to 20th	Night	30% 19% 32% 18% 1	703
	21st to end	Night	33% 20% 25% 20% 2	592
March	1st to 10th	Night	24% 18% 29% 25% 3	720
	11th to 20th	Night	27% 16% 28% 22% 7% 1	720
	21st to end	Night	25% 15% 28% 23% 9% 1	792
April	1st to 10th	Night	22% 16% 26% 27% 9% 1	694
	11th to 20th	Night	21% 14% 26% 25% 13% 1	533
	21st to end	Night	18% 9% 29% 28% 15% 1	540
May	1st to 10th	Night	17% 10% 27% 30% 14% 2	540
	11th to 20th	Night	17% 7% 20% 34% 20% 3	531
	21st to end	Night	13% 2 14% 36% 30% 5%	584
June	1st to 10th	Night	11% 5% 13% 38% 29% 4	540
	11th to 20th	Night	6% 3 14% 34% 33% 11%	540
	21st to end	Night	11% 2 13% 33% 34% 7%	540
July	1st to 10th	Night	12% 3 5% 31% 43% 6%	525
	11th to 20th	Night	11% 3 7% 29% 41% 10%	522
	21st to end	Night	8% 3 6% 31% 44% 8%	591
August	1st to 10th	Night	10% 4 6% 34% 37% 9%	537
	11th to 20th	Night	12% 4 8% 33% 39% 4	534
	21st to end	Night	13% 5% 5% 28% 40% 10%	594
September	1st to 10th	Night	13% 3 9% 29% 39% 8%	699
	11th to 20th	Night	17% 4 8% 35% 31% 6%	720
	21st to end	Night	15% 4 17% 35% 27% 2	720
October	1st to 10th	Night	18% 5% 19% 23% 27% 8%	720
	11th to 20th	Night	20% 9% 23% 29% 16% 3	720
	21st to end	Night	19% 10% 23% 32% 14% 2	792
November	1st to 10th	Night	19% 8% 21% 31% 18% 4	740
	11th to 20th	Night	18% 15% 24% 28% 12% 1	760
	21st to end	Night	23% 10% 27% 26% 13% 1	760
December	1st to 10th	Night	26% 17% 25% 25% 7%	760
	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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