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 2026-04-02.

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	13% 9% 3 8% 5% 5% 5% 4 6% 7% 35%	131404
	Night	14% 10% 3 7% 5% 4 4 4 5% 7% 37%	130448
Transparency	Day	28% 39% 8% 13% 9% 3	135166
	Night	28% 38% 8% 12% 10% 3	134755
Seeing	Day	21% 14% 25% 22% 13% 5%	16684
	Night	20% 11% 22% 27% 17% 3	26808

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	16% 14% 6% 7% 4 3 3 3 4 5% 34%	5258
	11th to 20th	Day	10% 11% 6% 9% 5% 3 3 2 3 4 42%	5280
	21st to end	Day	17% 13% 6% 8% 4 4 3 3 4 5% 33%	5780
February	1st to 10th	Day	17% 13% 5% 8% 5% 4 4 3 5% 4 32%	2084
	11th to 20th	Day	22% 12% 4 9% 3 3 4 2 4 5% 31%	2048
	21st to end	Day	19% 12% 3 7% 5% 3 4 3 5% 4 35%	1730
March	1st to 10th	Day	18% 10% 5% 7% 5% 4 4 3 5% 6% 33%	4758
	11th to 20th	Day	12% 9% 3 6% 3 4 3 3 5% 6% 45%	5090
	21st to end	Day	16% 10% 2 7% 5% 4 4 3 5% 6% 40%	5586
April	1st to 10th	Day	12% 9% 2 6% 4 4 6% 4 6% 7% 39%	2256
	11th to 20th	Day	15% 8% 3 6% 4 4 4 4 6% 7% 41%	2397
	21st to end	Day	16% 8% 2 7% 5% 4 5% 4 6% 6% 38%	2600
May	1st to 10th	Day	16% 9% 4 9% 5% 6% 6% 5% 6% 8% 27%	5862
	11th to 20th	Day	16% 10% 4 10% 7% 7% 6% 4 6% 7% 24%	5861
	21st to end	Day	15% 8% 3 8% 5% 5% 5% 5% 7% 8% 30%	6433
June	1st to 10th	Day	11% 6% 2 8% 6% 6% 7% 5% 7% 9% 32%	2600
	11th to 20th	Day	6% 6% 3 8% 7% 6% 7% 6% 8% 10% 34%	2600
	21st to end	Day	9% 7% 3 8% 6% 5% 5% 5% 9% 10% 34%	2600
July	1st to 10th	Day	7% 6% 2 7% 6% 6% 6% 5% 9% 11% 36%	5900
	11th to 20th	Day	11% 6% 3 8% 6% 7% 8% 6% 8% 9% 29%	5900
	21st to end	Day	12% 9% 4 10% 8% 7% 7% 6% 7% 10% 19%	6424
August	1st to 10th	Day	9% 5% 3 8% 6% 6% 7% 5% 8% 12% 31%	4234
	11th to 20th	Day	10% 6% 3 8% 5% 5% 7% 6% 8% 11% 32%	4088
	21st to end	Day	8% 5% 2 6% 6% 5% 6% 4 7% 7% 45%	4312
September	1st to 10th	Day	13% 5% 3 8% 5% 5% 6% 5% 6% 8% 37%	2201
	11th to 20th	Day	15% 6% 3 8% 5% 5% 5% 4 6% 7% 37%	2200
	21st to end	Day	14% 6% 2 6% 4 5% 5% 3 7% 7% 40%	2200
October	1st to 10th	Day	11% 6% 2 5% 4 4 4 4 5% 6% 50%	2200
	11th to 20th	Day	14% 7% 2 5% 3 2 3 3 5% 6% 52%	2040
	21st to end	Day	15% 7% 2 4 3 3 4 3 5% 6% 49%	2200
November	1st to 10th	Day	11% 6% 2 6% 3 3 3 3 5% 5% 53%	1854
	11th to 20th	Day	11% 9% 3 6% 3 3 4 4 6% 6% 46%	1890
	21st to end	Day	13% 10% 3 6% 4 3 5% 4 5% 6% 42%	1890
December	1st to 10th	Day	15% 10% 4 6% 4 4 4 4 4 5% 40%	3020
	11th to 20th	Day	16% 13% 5% 9% 5% 4 4 3 4 5% 30%	3463
	21st to end	Day	12% 12% 5% 10% 5% 4 5% 3 5% 7% 33%	4565
January	1st to 10th	Night	14% 15% 4 9% 4 3 3 3 4 6% 34%	7635
	11th to 20th	Night	15% 13% 4 7% 5% 4 4 2 4 4 39%	7680
	21st to end	Night	15% 13% 5% 9% 4 4 3 3 4 4 36%	8401
February	1st to 10th	Night	17% 11% 4 7% 5% 4 4 3 5% 5% 35%	2530
	11th to 20th	Night	22% 12% 4 8% 4 4 3 3 3 4 32%	2458
	21st to end	Night	20% 12% 4 7% 4 4 4 3 5% 4 32%	2076
March	1st to 10th	Night	19% 15% 4 6% 4 4 4 3 4 6% 32%	5313
	11th to 20th	Night	12% 7% 2 5% 4 3 4 3 6% 7% 46%	5090
	21st to end	Night	12% 9% 3 7% 5% 4 5% 4 4 6% 40%	5588
April	1st to 10th	Night	14% 10% 2 5% 4 4 3 3 5% 7% 43%	2182
	11th to 20th	Night	13% 9% 3 5% 4 4 3 3 5% 7% 44%	1950
	21st to end	Night	16% 6% 2 5% 4 5% 4 4 6% 7% 42%	1800
May	1st to 10th	Night	14% 8% 3 9% 6% 6% 6% 5% 7% 9% 28%	4033
	11th to 20th	Night	19% 10% 4 9% 5% 5% 5% 4 6% 7% 26%	4032
	21st to end	Night	14% 9% 3 7% 6% 5% 5% 4 6% 9% 31%	4421
June	1st to 10th	Night	10% 6% 2 5% 6% 6% 6% 5% 7% 10% 38%	1800
	11th to 20th	Night	6% 4 2 5% 4 5% 6% 6% 9% 12% 41%	1800
	21st to end	Night	9% 6% 2 6% 5% 5% 5% 6% 7% 9% 40%	1800
July	1st to 10th	Night	10% 7% 3 6% 6% 6% 6% 4 8% 10% 34%	4058
	11th to 20th	Night	10% 6% 3 7% 4 5% 6% 5% 9% 11% 33%	4057
	21st to end	Night	11% 9% 4 11% 7% 7% 6% 5% 8% 10% 22%	4427
August	1st to 10th	Night	9% 6% 2 7% 6% 5% 5% 5% 7% 11% 38%	2915
	11th to 20th	Night	13% 6% 3 6% 4 5% 5% 5% 6% 9% 38%	2956
	21st to end	Night	7% 5% 3 6% 4 4 5% 5% 7% 10% 45%	3586
September	1st to 10th	Night	11% 6% 2 7% 6% 5% 4 3 7% 8% 40%	2177
	11th to 20th	Night	13% 7% 3 6% 5% 4 4 4 6% 8% 41%	2200
	21st to end	Night	13% 6% 2 6% 5% 4 4 4 5% 7% 44%	2200
October	1st to 10th	Night	13% 6% 2 4 3 3 3 3 4 7% 52%	2200
	11th to 20th	Night	15% 6% 2 5% 4 3 3 3 3 4 52%	2357
	21st to end	Night	14% 7% 1 5% 3 3 4 3 4 6% 50%	2640
November	1st to 10th	Night	13% 7% 3 5% 4 3 3 3 4 5% 50%	2661
	11th to 20th	Night	14% 9% 3 6% 3 3 4 3 5% 5% 46%	2730
	21st to end	Night	15% 10% 2 7% 3 4 3 3 5% 6% 42%	2730
December	1st to 10th	Night	17% 13% 4 9% 4 2 4 2 4 4 36%	4380
	11th to 20th	Night	16% 13% 6% 10% 5% 4 4 3 4 5% 30%	4952
	21st to end	Night	13% 13% 6% 9% 5% 4 4 3 5% 7% 31%	6633

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	39% 21% 9% 15% 13% 2	5259
	11th to 20th	Day	32% 22% 5% 9% 24% 8%	5280
	21st to end	Day	43% 23% 6% 13% 11% 5%	5780
February	1st to 10th	Day	22% 60% 3 8% 6% 1	2084
	11th to 20th	Day	25% 58% 2 7% 6% 1	2058
	21st to end	Day	22% 59% 2 7% 7% 3	1730
March	1st to 10th	Day	38% 30% 5% 11% 9% 7%	4758
	11th to 20th	Day	24% 29% 4 13% 18% 12%	5090
	21st to end	Day	30% 29% 6% 23% 9% 3	5586
April	1st to 10th	Day	19% 64% 4 8% 6%	2256
	11th to 20th	Day	19% 63% 4 8% 6% 1	2397
	21st to end	Day	17% 63% 4 11% 5% 1	2600
May	1st to 10th	Day	38% 34% 9% 15% 4	5897
	11th to 20th	Day	41% 34% 10% 13% 2	5865
	21st to end	Day	35% 33% 8% 13% 9% 1	6447
June	1st to 10th	Day	17% 64% 6% 8% 4	2600
	11th to 20th	Day	16% 65% 9% 8% 3	2600
	21st to end	Day	16% 64% 9% 8% 3	2600
July	1st to 10th	Day	24% 35% 17% 17% 7%	5835
	11th to 20th	Day	33% 35% 19% 12% 1	5831
	21st to end	Day	44% 34% 11% 8% 3	6240
August	1st to 10th	Day	26% 41% 14% 15% 3	4221
	11th to 20th	Day	22% 42% 19% 11% 6%	4127
	21st to end	Day	18% 40% 10% 27% 5% 1	4311
September	1st to 10th	Day	17% 59% 5% 9% 9% 1	2201
	11th to 20th	Day	17% 59% 6% 11% 6%	2200
	21st to end	Day	17% 59% 7% 10% 6%	2200
October	1st to 10th	Day	15% 38% 5% 12% 21% 9%	3590
	11th to 20th	Day	12% 36% 3 14% 20% 14%	3306
	21st to end	Day	13% 38% 5% 21% 15% 8%	3538
November	1st to 10th	Day	19% 53% 5% 9% 11% 2	1854
	11th to 20th	Day	17% 55% 3 11% 11% 3	1890
	21st to end	Day	20% 56% 3 11% 8% 2	1890
December	1st to 10th	Day	27% 37% 6% 11% 16% 4	3020
	11th to 20th	Day	38% 33% 8% 9% 10% 3	3460
	21st to end	Day	35% 27% 12% 16% 7% 2	4565
January	1st to 10th	Night	40% 22% 11% 14% 11% 2	7636
	11th to 20th	Night	36% 22% 4 10% 20% 8%	7680
	21st to end	Night	42% 23% 6% 9% 13% 7%	8401
February	1st to 10th	Night	21% 60% 3 8% 6% 2	2530
	11th to 20th	Night	26% 58% 3 6% 6% 1	2459
	21st to end	Night	21% 60% 4 8% 6% 3	2076
March	1st to 10th	Night	39% 32% 6% 10% 11% 3	5313
	11th to 20th	Night	21% 29% 6% 16% 16% 12%	5090
	21st to end	Night	30% 30% 9% 18% 10% 3	5588
April	1st to 10th	Night	18% 62% 5% 7% 6% 1	2182
	11th to 20th	Night	18% 62% 4 9% 5% 2	1950
	21st to end	Night	16% 63% 4 11% 5% 1	1800
May	1st to 10th	Night	36% 35% 10% 16% 3	4060
	11th to 20th	Night	42% 33% 10% 11% 3	4033
	21st to end	Night	34% 34% 11% 14% 6%	4429
June	1st to 10th	Night	15% 64% 8% 9% 4 1	1800
	11th to 20th	Night	12% 65% 10% 9% 4	1800
	21st to end	Night	15% 64% 8% 10% 4	1800
July	1st to 10th	Night	28% 33% 17% 18% 4	4015
	11th to 20th	Night	27% 34% 24% 13% 1	4006
	21st to end	Night	40% 34% 14% 9% 3	4297
August	1st to 10th	Night	24% 41% 14% 16% 4	2904
	11th to 20th	Night	22% 40% 20% 12% 6%	2983
	21st to end	Night	15% 41% 13% 26% 6%	3586
September	1st to 10th	Night	16% 59% 7% 10% 8% 1	2177
	11th to 20th	Night	15% 60% 8% 11% 7%	2200
	21st to end	Night	17% 59% 8% 9% 7%	2200
October	1st to 10th	Night	16% 38% 6% 15% 16% 9%	3590
	11th to 20th	Night	15% 36% 3 14% 17% 16%	3830
	21st to end	Night	12% 36% 3 21% 17% 11%	4252
November	1st to 10th	Night	21% 54% 4 11% 9% 1	2661
	11th to 20th	Night	19% 55% 2 10% 10% 4	2730
	21st to end	Night	21% 55% 3 11% 9% 1	2730
December	1st to 10th	Night	34% 37% 3 8% 16% 2	4380
	11th to 20th	Night	37% 33% 7% 10% 11% 3	4954
	21st to end	Night	38% 28% 11% 11% 10% 1	6633

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% 30% 32% 7% 1	330
	11th to 20th	Day	36% 28% 24% 11% 1	330
	21st to end	Day	28% 31% 32% 8%	363
February	1st to 10th	Day	28% 28% 35% 8% 1	330
	11th to 20th	Day	47% 25% 23% 5%	330
	21st to end	Day	41% 26% 26% 6% 1	273
March	1st to 10th	Day	32% 20% 34% 11% 3	404
	11th to 20th	Day	32% 22% 32% 9% 4 1	540
	21st to end	Day	29% 22% 30% 15% 4	594
April	1st to 10th	Day	28% 20% 26% 18% 6% 1	504
	11th to 20th	Day	23% 22% 29% 17% 7% 2	492
	21st to end	Day	25% 16% 27% 21% 8% 3	500
May	1st to 10th	Day	24% 19% 29% 16% 8% 3	503
	11th to 20th	Day	18% 15% 26% 27% 10% 5%	527
	21st to end	Day	19% 11% 22% 25% 16% 7%	573
June	1st to 10th	Day	13% 11% 24% 29% 18% 6%	530
	11th to 20th	Day	8% 8% 21% 32% 23% 9%	530
	21st to end	Day	13% 5% 24% 31% 18% 9%	530
July	1st to 10th	Day	12% 4 18% 30% 26% 10%	525
	11th to 20th	Day	13% 7% 12% 31% 25% 12%	524
	21st to end	Day	13% 4 15% 30% 27% 11%	576
August	1st to 10th	Day	17% 8% 19% 24% 21% 11%	526
	11th to 20th	Day	12% 4 18% 32% 25% 8%	519
	21st to end	Day	13% 5% 12% 29% 27% 13%	583
September	1st to 10th	Day	11% 5% 19% 29% 28% 7%	530
	11th to 20th	Day	15% 6% 16% 30% 23% 9%	530
	21st to end	Day	18% 7% 20% 35% 17% 4	530
October	1st to 10th	Day	15% 9% 26% 28% 17% 5%	530
	11th to 20th	Day	19% 11% 29% 27% 12% 2	530
	21st to end	Day	23% 10% 28% 26% 10% 3	583
November	1st to 10th	Day	19% 17% 32% 23% 7% 1	332
	11th to 20th	Day	22% 22% 34% 20% 3	330
	21st to end	Day	23% 21% 35% 18% 4	330
December	1st to 10th	Day	32% 21% 33% 13% 1	330
	11th to 20th	Day	27% 20% 37% 15% 2	330
	21st to end	Day	26% 23% 38% 11% 1	363
January	1st to 10th	Night	26% 19% 28% 22% 4	840
	11th to 20th	Night	29% 20% 28% 18% 4	840
	21st to end	Night	23% 20% 34% 21% 3	924
February	1st to 10th	Night	25% 16% 32% 24% 3	840
	11th to 20th	Night	32% 18% 32% 16% 1	823
	21st to end	Night	33% 20% 26% 18% 2	692
March	1st to 10th	Night	25% 18% 30% 23% 3	840
	11th to 20th	Night	26% 17% 30% 20% 6% 1	840
	21st to end	Night	24% 16% 31% 21% 8%	924
April	1st to 10th	Night	23% 18% 26% 24% 8% 1	775
	11th to 20th	Night	21% 15% 27% 24% 11% 1	593
	21st to end	Night	17% 10% 32% 27% 13% 1	600
May	1st to 10th	Night	17% 11% 28% 30% 13% 2	600
	11th to 20th	Night	17% 9% 21% 32% 18% 3	591
	21st to end	Night	14% 4 17% 35% 27% 4	650
June	1st to 10th	Night	11% 5% 15% 39% 27% 4	600
	11th to 20th	Night	6% 4 16% 35% 30% 10%	600
	21st to end	Night	11% 2 14% 35% 32% 7%	600
July	1st to 10th	Night	12% 4 6% 32% 40% 5%	585
	11th to 20th	Night	10% 3 7% 30% 40% 10%	582
	21st to end	Night	8% 4 8% 31% 42% 7%	657
August	1st to 10th	Night	11% 4 8% 35% 35% 8%	597
	11th to 20th	Night	12% 4 9% 34% 37% 4	594
	21st to end	Night	12% 5% 7% 29% 39% 9%	660
September	1st to 10th	Night	13% 3 11% 30% 36% 7%	777
	11th to 20th	Night	16% 4 9% 37% 29% 5%	800
	21st to end	Night	15% 5% 19% 34% 26% 2	800
October	1st to 10th	Night	17% 6% 20% 25% 26% 7%	800
	11th to 20th	Night	19% 9% 24% 32% 15% 3	800
	21st to end	Night	18% 11% 25% 32% 13% 2	880
November	1st to 10th	Night	19% 9% 22% 31% 16% 3	820
	11th to 20th	Night	19% 16% 25% 27% 11% 1	840
	21st to end	Night	23% 12% 28% 25% 12% 1	840
December	1st to 10th	Night	26% 18% 27% 23% 6%	840
	11th to 20th	Night	23% 14% 31% 25% 6% 1	840
	21st to end	Night	27% 16% 27% 27% 4	924

Page generated at 2026-03-30 02:18:40. Version ac07

Copyright © 2026 Attilla Danko.