Dyersburg
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Dyersburg clear sky chart from 2005-11-06 to 2026-05-02.

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	12% 7% 2 6% 4 4 4 4 6% 8% 43%	131415
	Night	13% 6% 2 6% 4 4 4 3 5% 7% 46%	131262
Transparency	Day	38% 6% 11% 24% 18% 4	135064
	Night	36% 5% 10% 24% 20% 5%	135679
Seeing	Day	15% 8% 22% 25% 20% 10%	17321
	Night	16% 7% 25% 32% 18% 2	27197

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% 9% 4 10% 4 3 3 3 4 6% 38%	4691
	11th to 20th	Day	12% 7% 2 7% 3 3 3 2 3 5% 51%	5249
	21st to end	Day	20% 7% 2 5% 4 3 3 2 4 6% 43%	5812
February	1st to 10th	Day	20% 9% 3 6% 4 3 3 3 4 5% 39%	2054
	11th to 20th	Day	20% 9% 3 7% 4 3 3 3 5% 5% 38%	2048
	21st to end	Day	20% 9% 3 6% 5% 4 4 3 4 5% 37%	1730
March	1st to 10th	Day	17% 14% 3 7% 4 3 4 3 4 5% 36%	4580
	11th to 20th	Day	13% 7% 2 6% 4 3 3 3 4 6% 49%	4993
	21st to end	Day	12% 6% 3 7% 5% 4 4 4 5% 7% 43%	6000
April	1st to 10th	Day	13% 6% 2 5% 5% 3 4 3 5% 7% 46%	2520
	11th to 20th	Day	15% 6% 2 6% 4 5% 4 4 5% 6% 43%	2494
	21st to end	Day	14% 7% 3 7% 5% 4 4 3 5% 8% 40%	2520
May	1st to 10th	Day	14% 8% 3 8% 6% 5% 6% 4 8% 9% 29%	5502
	11th to 20th	Day	14% 8% 3 8% 6% 5% 6% 5% 7% 9% 31%	5861
	21st to end	Day	15% 7% 3 7% 4 5% 5% 4 7% 7% 37%	6749
June	1st to 10th	Day	8% 5% 2 6% 4 5% 5% 5% 7% 9% 44%	2800
	11th to 20th	Day	5% 3 2 5% 5% 5% 6% 5% 7% 10% 47%	2800
	21st to end	Day	4 4 2 5% 5% 5% 5% 6% 7% 10% 48%	2800
July	1st to 10th	Day	6% 5% 2 7% 5% 6% 6% 5% 7% 10% 41%	6360
	11th to 20th	Day	6% 4 2 5% 4 5% 5% 5% 8% 13% 42%	6360
	21st to end	Day	9% 7% 3 7% 5% 5% 5% 5% 7% 10% 38%	6451
August	1st to 10th	Day	3 3 1 3 3 3 4 4 7% 10% 59%	3915
	11th to 20th	Day	9% 5% 2 5% 4 4 5% 4 7% 9% 47%	3849
	21st to end	Day	6% 4 1 4 4 3 4 4 5% 8% 58%	4312
September	1st to 10th	Day	10% 5% 2 5% 4 5% 5% 4 6% 9% 47%	2400
	11th to 20th	Day	13% 6% 2 5% 4 4 4 3 5% 7% 47%	2311
	21st to end	Day	12% 6% 2 5% 3 3 4 4 4 6% 52%	2200
October	1st to 10th	Day	9% 3 2 5% 3 3 3 3 4 6% 60%	2118
	11th to 20th	Day	12% 5% 2 4 3 3 3 3 4 6% 55%	2000
	21st to end	Day	19% 6% 1 4 3 2 3 3 5% 5% 49%	2180
November	1st to 10th	Day	11% 5% 2 5% 3 3 2 3 4 6% 56%	1852
	11th to 20th	Day	14% 6% 2 5% 3 3 3 3 4 7% 51%	1890
	21st to end	Day	18% 7% 2 7% 3 4 4 3 4 5% 44%	1890
December	1st to 10th	Day	14% 9% 3 6% 4 3 4 2 4 5% 46%	2966
	11th to 20th	Day	17% 8% 3 7% 4 4 4 3 5% 6% 42%	3088
	21st to end	Day	17% 11% 4 8% 5% 5% 5% 3 5% 6% 32%	4070
January	1st to 10th	Night	18% 7% 2 8% 3 3 4 3 4 5% 42%	8232
	11th to 20th	Night	13% 6% 2 6% 4 3 3 2 3 4 53%	7725
	21st to end	Night	20% 8% 3 6% 4 4 3 3 4 5% 41%	8402
February	1st to 10th	Night	19% 9% 4 6% 4 3 3 3 5% 6% 39%	2562
	11th to 20th	Night	20% 8% 2 6% 4 4 4 3 4 5% 41%	2458
	21st to end	Night	19% 7% 2 6% 4 3 3 3 4 6% 42%	2076
March	1st to 10th	Night	17% 10% 2 6% 4 4 4 3 5% 5% 40%	5493
	11th to 20th	Night	12% 7% 2 5% 4 4 4 3 4 6% 51%	5217
	21st to end	Night	13% 6% 2 7% 5% 4 4 4 6% 7% 44%	5169
April	1st to 10th	Night	11% 5% 2 5% 4 4 4 4 6% 8% 47%	2100
	11th to 20th	Night	15% 5% 2 5% 3 3 3 3 5% 7% 48%	2075
	21st to end	Night	14% 6% 3 6% 4 3 3 3 5% 8% 44%	2100
May	1st to 10th	Night	19% 9% 3 7% 4 4 4 4 4 7% 36%	4413
	11th to 20th	Night	14% 9% 3 8% 5% 5% 4 3 5% 6% 37%	4032
	21st to end	Night	14% 6% 2 7% 5% 4 5% 4 6% 8% 38%	4103
June	1st to 10th	Night	8% 6% 2 5% 5% 6% 4 4 6% 8% 46%	1600
	11th to 20th	Night	5% 3 2 4 4 4 5% 3 5% 9% 57%	1600
	21st to end	Night	3 2 1 4 4 4 5% 5% 8% 12% 52%	1600
July	1st to 10th	Night	7% 5% 2 6% 4 5% 5% 4 7% 10% 45%	3618
	11th to 20th	Night	4 4 2 5% 5% 5% 4 5% 7% 12% 48%	3617
	21st to end	Night	6% 6% 3 7% 4 4 4 4 6% 12% 42%	4401
August	1st to 10th	Night	2 2 1 4 3 4 4 3 6% 8% 63%	3232
	11th to 20th	Night	4 3 2 5% 4 4 4 4 7% 11% 53%	3200
	21st to end	Night	4 3 1 4 3 3 4 3 6% 9% 59%	3586
September	1st to 10th	Night	8% 4 2 5% 4 3 4 3 5% 8% 54%	2000
	11th to 20th	Night	10% 5% 2 5% 4 2 4 3 5% 7% 52%	2067
	21st to end	Night	9% 5% 1 4 3 2 3 3 5% 6% 56%	2200
October	1st to 10th	Night	8% 3 1 3 3 2 3 3 5% 7% 61%	2278
	11th to 20th	Night	12% 5% 2 4 2 4 3 2 3 4 60%	2400
	21st to end	Night	18% 6% 2 5% 3 3 3 3 4 4 51%	2659
November	1st to 10th	Night	12% 5% 2 4 3 3 3 2 4 6% 56%	2666
	11th to 20th	Night	11% 4 1 5% 4 3 3 3 5% 6% 54%	2730
	21st to end	Night	15% 7% 2 5% 4 3 3 3 4 6% 48%	2730
December	1st to 10th	Night	18% 6% 2 5% 3 3 3 2 4 5% 49%	4432
	11th to 20th	Night	18% 8% 2 5% 4 3 3 3 4 5% 45%	5339
	21st to end	Night	19% 8% 3 7% 4 5% 4 3 5% 5% 36%	7150

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	47% 4 11% 24% 13% 1	4692
	11th to 20th	Day	36% 3 6% 29% 25% 1	5249
	21st to end	Day	43% 3 7% 22% 19% 6%	5812
February	1st to 10th	Day	48% 4 10% 23% 13% 1	2054
	11th to 20th	Day	50% 4 8% 20% 14% 4	2058
	21st to end	Day	50% 4 8% 17% 15% 6%	1730
March	1st to 10th	Day	51% 3 6% 17% 15% 8%	4580
	11th to 20th	Day	37% 4 6% 25% 20% 7%	4993
	21st to end	Day	41% 4 10% 25% 19%	6002
April	1st to 10th	Day	37% 5% 10% 26% 20% 2	2520
	11th to 20th	Day	40% 5% 10% 22% 18% 5%	2494
	21st to end	Day	42% 4 10% 26% 16% 1	2520
May	1st to 10th	Day	47% 8% 14% 19% 11% 1	5537
	11th to 20th	Day	48% 7% 15% 19% 11% 1	5865
	21st to end	Day	43% 8% 11% 23% 14% 2	6763
June	1st to 10th	Day	35% 7% 13% 23% 20% 2	2800
	11th to 20th	Day	29% 7% 14% 28% 19% 4	2800
	21st to end	Day	27% 9% 15% 25% 20% 4	2800
July	1st to 10th	Day	35% 8% 13% 26% 16% 2	6291
	11th to 20th	Day	28% 10% 19% 32% 9% 2	6285
	21st to end	Day	39% 9% 18% 27% 7%	6268
August	1st to 10th	Day	19% 7% 18% 30% 23% 2	3902
	11th to 20th	Day	32% 7% 16% 26% 17% 3	3885
	21st to end	Day	24% 6% 11% 32% 24% 3	4311
September	1st to 10th	Day	33% 7% 11% 26% 18% 5%	2400
	11th to 20th	Day	37% 5% 9% 23% 23% 4	2311
	21st to end	Day	34% 4 8% 22% 26% 6%	2200
October	1st to 10th	Day	17% 3 6% 16% 41% 17%	3443
	11th to 20th	Day	21% 3 6% 22% 32% 15%	3240
	21st to end	Day	29% 3 4 27% 30% 6%	3506
November	1st to 10th	Day	32% 4 8% 27% 24% 6%	1852
	11th to 20th	Day	35% 3 7% 23% 26% 6%	1890
	21st to end	Day	43% 4 6% 22% 21% 4	1890
December	1st to 10th	Day	41% 4 7% 28% 19% 2	2966
	11th to 20th	Day	44% 4 10% 24% 15% 3	3085
	21st to end	Day	52% 5% 9% 23% 10% 1	4070
January	1st to 10th	Night	45% 4 11% 26% 13% 1	8233
	11th to 20th	Night	36% 3 6% 21% 30% 4	7725
	21st to end	Night	47% 3 9% 19% 19% 3	8402
February	1st to 10th	Night	48% 4 10% 20% 18% 2	2562
	11th to 20th	Night	47% 4 7% 21% 17% 4	2459
	21st to end	Night	44% 4 7% 19% 20% 6%	2076
March	1st to 10th	Night	46% 4 6% 17% 18% 9%	5493
	11th to 20th	Night	35% 3 7% 22% 18% 14%	5217
	21st to end	Night	38% 4 9% 26% 19% 3	5169
April	1st to 10th	Night	35% 5% 11% 25% 20% 5%	2100
	11th to 20th	Night	36% 4 9% 23% 21% 7%	2075
	21st to end	Night	39% 5% 9% 24% 20% 3	2100
May	1st to 10th	Night	48% 6% 14% 21% 10% 2	4443
	11th to 20th	Night	47% 6% 14% 21% 11% 1	4033
	21st to end	Night	42% 7% 11% 24% 14% 3	4111
June	1st to 10th	Night	34% 7% 12% 22% 24% 2	1600
	11th to 20th	Night	24% 5% 14% 31% 21% 5%	1600
	21st to end	Night	23% 8% 17% 28% 19% 6%	1600
July	1st to 10th	Night	31% 8% 16% 26% 17% 2	3580
	11th to 20th	Night	26% 9% 19% 32% 11% 3	3572
	21st to end	Night	34% 8% 19% 28% 10%	4274
August	1st to 10th	Night	17% 5% 14% 39% 23% 1	3221
	11th to 20th	Night	23% 8% 15% 32% 19% 2	3230
	21st to end	Night	21% 6% 11% 33% 25% 4	3586
September	1st to 10th	Night	28% 5% 11% 27% 22% 7%	2000
	11th to 20th	Night	32% 5% 10% 22% 28% 4	2067
	21st to end	Night	28% 4 10% 24% 27% 7%	2200
October	1st to 10th	Night	15% 4 5% 17% 38% 21%	3720
	11th to 20th	Night	19% 2 4 18% 39% 19%	3899
	21st to end	Night	27% 3 6% 26% 26% 12%	4283
November	1st to 10th	Night	30% 4 7% 26% 27% 7%	2666
	11th to 20th	Night	31% 3 6% 24% 25% 10%	2730
	21st to end	Night	38% 3 7% 24% 23% 4	2730
December	1st to 10th	Night	39% 3 8% 26% 21% 2	4432
	11th to 20th	Night	43% 3 6% 25% 20% 3	5341
	21st to end	Night	49% 4 9% 24% 11% 2	7150

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	23% 15% 36% 21% 4 1	330
	11th to 20th	Day	25% 18% 35% 17% 3 1	330
	21st to end	Day	23% 15% 43% 16% 4	363
February	1st to 10th	Day	25% 14% 35% 18% 5% 2	330
	11th to 20th	Day	32% 18% 32% 15% 3	330
	21st to end	Day	29% 19% 33% 14% 5%	273
March	1st to 10th	Day	25% 15% 36% 17% 7% 1	330
	11th to 20th	Day	23% 18% 39% 17% 3 1	330
	21st to end	Day	20% 16% 35% 22% 8%	547
April	1st to 10th	Day	18% 14% 32% 26% 9% 1	540
	11th to 20th	Day	19% 13% 33% 24% 10% 2	532
	21st to end	Day	17% 13% 32% 23% 13% 3	540
May	1st to 10th	Day	17% 12% 29% 28% 12% 3	507
	11th to 20th	Day	17% 5% 22% 27% 19% 10%	527
	21st to end	Day	11% 5% 20% 32% 21% 12%	707
June	1st to 10th	Day	9% 4 18% 26% 28% 15%	730
	11th to 20th	Day	6% 2 13% 33% 33% 13%	730
	21st to end	Day	5% 1 16% 34% 28% 16%	730
July	1st to 10th	Day	7% 1 11% 27% 31% 24%	721
	11th to 20th	Day	6% 3 10% 25% 36% 20%	718
	21st to end	Day	9% 1 8% 27% 35% 21%	794
August	1st to 10th	Day	7% 1 7% 26% 40% 18%	536
	11th to 20th	Day	13% 2 9% 24% 35% 17%	519
	21st to end	Day	10% 9% 22% 32% 26%	583
September	1st to 10th	Day	10% 2 9% 28% 35% 16%	530
	11th to 20th	Day	11% 2 10% 20% 38% 19%	530
	21st to end	Day	15% 4 14% 28% 25% 13%	530
October	1st to 10th	Day	9% 3 18% 32% 29% 9%	448
	11th to 20th	Day	12% 6% 33% 29% 14% 7%	330
	21st to end	Day	25% 10% 32% 20% 12% 2	363
November	1st to 10th	Day	14% 10% 30% 29% 14% 3	330
	11th to 20th	Day	11% 10% 37% 30% 12% 1	330
	21st to end	Day	22% 13% 29% 21% 12% 3	330
December	1st to 10th	Day	22% 15% 32% 23% 8% 1	330
	11th to 20th	Day	22% 13% 34% 20% 9% 1	330
	21st to end	Day	21% 18% 34% 22% 4	363
January	1st to 10th	Night	22% 9% 38% 27% 4	1050
	11th to 20th	Night	23% 12% 38% 23% 4	1050
	21st to end	Night	21% 12% 38% 26% 3	1155
February	1st to 10th	Night	23% 11% 36% 26% 4	882
	11th to 20th	Night	25% 12% 36% 25% 2	823
	21st to end	Night	22% 15% 36% 24% 2	692
March	1st to 10th	Night	19% 13% 33% 31% 4	840
	11th to 20th	Night	22% 10% 35% 27% 5% 1	692
	21st to end	Night	16% 10% 36% 28% 10%	693
April	1st to 10th	Night	14% 11% 37% 30% 8% 1	630
	11th to 20th	Night	17% 10% 29% 32% 10% 1	623
	21st to end	Night	14% 7% 34% 31% 12% 1	630
May	1st to 10th	Night	17% 7% 26% 38% 12% 1	603
	11th to 20th	Night	14% 4 22% 37% 21% 2	591
	21st to end	Night	7% 3 20% 39% 28% 4	650
June	1st to 10th	Night	9% 3 12% 43% 29% 5%	600
	11th to 20th	Night	4 1 10% 44% 37% 3	600
	21st to end	Night	4 11% 40% 40% 5%	600
July	1st to 10th	Night	6% 2 8% 30% 46% 9%	585
	11th to 20th	Night	5% 1 7% 28% 49% 9%	582
	21st to end	Night	6% 2 7% 30% 45% 11%	657
August	1st to 10th	Night	4 1 6% 34% 50% 7%	597
	11th to 20th	Night	7% 1 6% 36% 44% 6%	594
	21st to end	Night	7% 5% 33% 46% 9%	660
September	1st to 10th	Night	10% 2 10% 32% 40% 6%	600
	11th to 20th	Night	11% 1 8% 33% 40% 7%	667
	21st to end	Night	12% 2 16% 34% 32% 5%	800
October	1st to 10th	Night	9% 3 15% 38% 32% 3	800
	11th to 20th	Night	16% 3 25% 35% 20% 1	800
	21st to end	Night	21% 6% 27% 32% 13% 1	880
November	1st to 10th	Night	13% 6% 28% 36% 16% 1	820
	11th to 20th	Night	12% 8% 35% 34% 11%	840
	21st to end	Night	18% 9% 30% 32% 10% 1	840
December	1st to 10th	Night	22% 9% 30% 33% 6%	866
	11th to 20th	Night	22% 8% 32% 31% 7%	1050
	21st to end	Night	25% 11% 32% 26% 5%	1155

Page generated at 2026-04-29 01:21:43. Version ac07

Copyright © 2026 Attilla Danko.