Cleveland(TX)
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Cleveland(TX) clear sky chart from 2005-11-06 to 2026-02-01.

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% 6% 2 6% 5% 5% 5% 4 6% 8% 40%	127413
	Night	15% 7% 2 5% 4 3 4 3 5% 7% 45%	124857
Transparency	Day	41% 5% 11% 19% 17% 7%	131049
	Night	38% 5% 11% 20% 18% 9%	129284
Seeing	Day	15% 9% 22% 26% 21% 8%	16498
	Night	17% 8% 23% 31% 18% 2	26437

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	20% 9% 2 6% 3 3 3 3 3 5% 42%	4167
	11th to 20th	Day	16% 6% 2 5% 4 4 3 2 3 5% 51%	4170
	21st to end	Day	30% 8% 2 6% 2 2 2 2 4 6% 35%	4587
February	1st to 10th	Day	21% 8% 4 6% 4 4 3 3 4 5% 37%	1850
	11th to 20th	Day	22% 9% 2 7% 5% 4 3 2 4 4 38%	1986
	21st to end	Day	21% 8% 3 6% 4 3 3 3 4 5% 38%	1815
March	1st to 10th	Day	18% 8% 3 8% 5% 5% 4 3 4 5% 36%	4936
	11th to 20th	Day	15% 6% 2 6% 4 4 4 3 5% 6% 46%	4980
	21st to end	Day	18% 8% 2 7% 5% 4 4 3 4 6% 38%	5462
April	1st to 10th	Day	15% 9% 3 8% 6% 5% 4 4 5% 5% 38%	2200
	11th to 20th	Day	17% 7% 3 6% 5% 5% 4 4 5% 5% 39%	2359
	21st to end	Day	11% 7% 3 7% 6% 4 5% 3 6% 6% 42%	2400
May	1st to 10th	Day	19% 8% 3 7% 5% 5% 5% 4 6% 7% 30%	5485
	11th to 20th	Day	11% 6% 2 7% 4 5% 5% 4 6% 8% 42%	5862
	21st to end	Day	10% 7% 3 8% 5% 6% 6% 5% 7% 10% 34%	6434
June	1st to 10th	Day	7% 4 2 7% 6% 6% 8% 5% 8% 10% 37%	2600
	11th to 20th	Day	6% 4 2 6% 6% 7% 7% 6% 9% 11% 38%	2600
	21st to end	Day	7% 6% 3 8% 7% 8% 7% 7% 7% 9% 31%	2600
July	1st to 10th	Day	8% 5% 2 7% 6% 7% 6% 6% 9% 12% 32%	5900
	11th to 20th	Day	6% 5% 2 7% 6% 7% 7% 6% 9% 12% 32%	5900
	21st to end	Day	12% 7% 3 7% 5% 5% 6% 4 7% 10% 34%	6422
August	1st to 10th	Day	2 2 1 4 4 4 5% 4 6% 10% 58%	4234
	11th to 20th	Day	3 3 1 4 4 5% 6% 5% 8% 14% 47%	3980
	21st to end	Day	9% 5% 2 7% 6% 6% 7% 5% 7% 10% 37%	4312
September	1st to 10th	Day	8% 5% 2 8% 5% 6% 6% 6% 7% 9% 38%	2214
	11th to 20th	Day	14% 7% 2 6% 5% 5% 5% 4 7% 7% 39%	2200
	21st to end	Day	8% 4 2 6% 5% 5% 5% 4 6% 7% 48%	2200
October	1st to 10th	Day	6% 4 1 5% 4 4 4 3 5% 7% 58%	2055
	11th to 20th	Day	9% 5% 2 6% 4 4 4 4 4 6% 54%	2000
	21st to end	Day	13% 5% 2 4 4 3 3 3 5% 5% 53%	2200
November	1st to 10th	Day	12% 5% 2 6% 5% 5% 4 3 5% 5% 48%	2058
	11th to 20th	Day	11% 6% 2 6% 4 5% 4 3 5% 5% 49%	2100
	21st to end	Day	15% 7% 3 8% 5% 3 3 3 4 6% 44%	2047
December	1st to 10th	Day	22% 9% 2 4 3 3 3 3 4 6% 41%	3030
	11th to 20th	Day	14% 8% 3 6% 5% 4 4 3 5% 6% 42%	3481
	21st to end	Day	17% 7% 2 6% 3 3 3 3 4 5% 46%	4587
January	1st to 10th	Night	19% 7% 2 5% 3 3 3 3 4 6% 46%	6018
	11th to 20th	Night	16% 7% 2 5% 3 3 2 2 3 5% 51%	6030
	21st to end	Night	30% 9% 2 5% 3 2 3 2 4 5% 35%	6633
February	1st to 10th	Night	21% 10% 3 6% 3 3 3 3 4 5% 39%	2567
	11th to 20th	Night	23% 9% 2 5% 4 3 2 2 5% 5% 40%	2298
	21st to end	Night	23% 8% 3 6% 4 3 3 3 4 5% 39%	1815
March	1st to 10th	Night	23% 10% 2 6% 3 3 3 3 4 6% 37%	4919
	11th to 20th	Night	18% 8% 3 6% 4 3 3 2 4 5% 45%	4980
	21st to end	Night	20% 9% 3 7% 4 3 4 2 3 5% 40%	5467
April	1st to 10th	Night	16% 7% 3 6% 4 5% 4 4 6% 7% 39%	2200
	11th to 20th	Night	18% 6% 2 6% 3 4 4 3 5% 7% 42%	1989
	21st to end	Night	15% 7% 2 6% 4 4 4 3 4 6% 44%	2000
May	1st to 10th	Night	24% 11% 3 7% 4 3 4 4 5% 7% 27%	4409
	11th to 20th	Night	15% 7% 3 6% 4 4 5% 4 6% 7% 40%	4053
	21st to end	Night	15% 9% 3 7% 5% 4 5% 4 7% 10% 31%	4443
June	1st to 10th	Night	6% 4 1 4 4 4 4 4 8% 12% 51%	1800
	11th to 20th	Night	5% 2 1 4 4 4 4 4 6% 12% 54%	1800
	21st to end	Night	5% 5% 2 5% 4 4 5% 6% 8% 11% 44%	1800
July	1st to 10th	Night	6% 5% 2 6% 4 4 5% 5% 8% 15% 40%	4078
	11th to 20th	Night	4 4 2 5% 4 4 5% 5% 6% 12% 49%	4077
	21st to end	Night	9% 5% 2 7% 4 4 5% 4 6% 10% 44%	4449
August	1st to 10th	Night	1 2 1 2 2 2 3 3 6% 10% 68%	2926
	11th to 20th	Night	2 2 1 2 2 3 3 4 7% 13% 61%	3069
	21st to end	Night	6% 4 2 4 4 5% 6% 5% 8% 12% 45%	3586
September	1st to 10th	Night	6% 5% 2 7% 4 5% 4 4 7% 9% 48%	2180
	11th to 20th	Night	11% 5% 2 6% 5% 6% 4 4 6% 8% 43%	2200
	21st to end	Night	8% 4 2 5% 3 3 4 4 5% 9% 54%	2200
October	1st to 10th	Night	5% 3 2 4 3 3 3 4 4 8% 61%	2325
	11th to 20th	Night	10% 4 1 4 3 2 3 2 4 5% 62%	2400
	21st to end	Night	12% 5% 2 4 3 3 3 2 3 5% 58%	2640
November	1st to 10th	Night	12% 6% 2 4 3 3 3 4 4 6% 53%	2460
	11th to 20th	Night	11% 6% 2 6% 3 4 3 3 5% 5% 53%	2520
	21st to end	Night	17% 7% 2 5% 3 4 4 3 5% 6% 45%	2567
December	1st to 10th	Night	20% 10% 3 7% 4 3 3 3 4 5% 37%	4380
	11th to 20th	Night	18% 11% 2 5% 3 3 3 3 4 5% 44%	4946
	21st to end	Night	17% 8% 2 5% 3 3 3 2 3 5% 48%	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	46% 3 4 22% 18% 7%	4168
	11th to 20th	Day	38% 3 3 17% 27% 11%	4170
	21st to end	Day	53% 2 3 14% 16% 13%	4587
February	1st to 10th	Day	50% 4 5% 13% 17% 12%	1850
	11th to 20th	Day	50% 3 6% 14% 16% 10%	1996
	21st to end	Day	49% 4 8% 14% 16% 10%	1815
March	1st to 10th	Day	50% 4 7% 12% 18% 10%	4936
	11th to 20th	Day	39% 4 6% 12% 20% 19%	4980
	21st to end	Day	48% 4 7% 19% 18% 5%	5464
April	1st to 10th	Day	48% 6% 6% 15% 17% 9%	2200
	11th to 20th	Day	46% 4 8% 14% 17% 10%	2359
	21st to end	Day	41% 6% 9% 18% 21% 6%	2400
May	1st to 10th	Day	51% 5% 9% 21% 11% 3	5520
	11th to 20th	Day	40% 5% 13% 19% 21% 2	5866
	21st to end	Day	42% 7% 12% 27% 12% 1	6447
June	1st to 10th	Day	39% 8% 15% 22% 15% 1	2600
	11th to 20th	Day	36% 9% 16% 23% 13% 2	2600
	21st to end	Day	45% 10% 16% 20% 9%	2600
July	1st to 10th	Day	43% 5% 30% 20% 3	5836
	11th to 20th	Day	42% 5% 25% 23% 6%	5831
	21st to end	Day	43% 7% 18% 24% 7%	6240
August	1st to 10th	Day	20% 6% 14% 37% 23%	4220
	11th to 20th	Day	25% 6% 32% 29% 6% 1	4019
	21st to end	Day	41% 9% 16% 18% 14% 1	4311
September	1st to 10th	Day	40% 10% 13% 17% 15% 6%	2214
	11th to 20th	Day	42% 8% 12% 18% 15% 5%	2200
	21st to end	Day	33% 7% 12% 20% 17% 12%	2200
October	1st to 10th	Day	19% 3 5% 14% 21% 38%	3341
	11th to 20th	Day	21% 3 4 19% 34% 19%	3240
	21st to end	Day	27% 3 4 15% 38% 13%	3538
November	1st to 10th	Day	37% 4 9% 17% 21% 11%	2058
	11th to 20th	Day	37% 4 7% 15% 23% 13%	2100
	21st to end	Day	43% 4 7% 18% 18% 10%	2047
December	1st to 10th	Day	46% 3 6% 17% 23% 5%	3030
	11th to 20th	Day	43% 4 7% 15% 21% 10%	3479
	21st to end	Day	41% 3 5% 16% 26% 9%	4587
January	1st to 10th	Night	40% 4 6% 23% 20% 8%	6018
	11th to 20th	Night	38% 2 4 18% 28% 10%	6030
	21st to end	Night	53% 3 3 13% 16% 11%	6633
February	1st to 10th	Night	48% 3 6% 13% 16% 14%	2567
	11th to 20th	Night	47% 4 6% 15% 17% 11%	2298
	21st to end	Night	49% 4 6% 13% 15% 13%	1815
March	1st to 10th	Night	50% 4 5% 13% 19% 10%	4919
	11th to 20th	Night	43% 4 6% 14% 16% 17%	4980
	21st to end	Night	48% 4 7% 15% 19% 7%	5467
April	1st to 10th	Night	44% 6% 8% 16% 16% 10%	2200
	11th to 20th	Night	42% 5% 9% 17% 16% 12%	1989
	21st to end	Night	42% 5% 9% 19% 20% 6%	2000
May	1st to 10th	Night	55% 5% 9% 19% 9% 3	4439
	11th to 20th	Night	42% 5% 12% 20% 19% 2	4054
	21st to end	Night	45% 7% 17% 23% 7% 1	4452
June	1st to 10th	Night	24% 9% 19% 31% 17%	1800
	11th to 20th	Night	23% 7% 20% 30% 17% 3	1800
	21st to end	Night	29% 10% 21% 28% 11% 1	1800
July	1st to 10th	Night	33% 6% 35% 23% 3	4035
	11th to 20th	Night	29% 6% 30% 29% 6%	4026
	21st to end	Night	36% 7% 20% 30% 7%	4320
August	1st to 10th	Night	12% 5% 18% 43% 21%	2916
	11th to 20th	Night	15% 7% 36% 36% 7%	3096
	21st to end	Night	31% 12% 21% 24% 10% 2	3586
September	1st to 10th	Night	30% 9% 21% 21% 13% 6%	2180
	11th to 20th	Night	38% 7% 15% 20% 15% 5%	2200
	21st to end	Night	27% 6% 14% 23% 19% 12%	2200
October	1st to 10th	Night	17% 4 6% 17% 18% 38%	3806
	11th to 20th	Night	15% 3 4 25% 31% 22%	3899
	21st to end	Night	25% 2 4 14% 39% 15%	4252
November	1st to 10th	Night	32% 4 11% 19% 23% 11%	2460
	11th to 20th	Night	34% 4 9% 19% 22% 13%	2520
	21st to end	Night	41% 4 9% 18% 19% 11%	2567
December	1st to 10th	Night	51% 3 5% 16% 19% 6%	4380
	11th to 20th	Night	45% 2 8% 10% 21% 13%	4947
	21st to end	Night	40% 3 5% 15% 28% 9%	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	27% 16% 36% 14% 5% 1	330
	11th to 20th	Day	28% 16% 32% 19% 4 1	330
	21st to end	Day	28% 21% 30% 17% 4	363
February	1st to 10th	Day	27% 19% 34% 15% 4	300
	11th to 20th	Day	33% 19% 30% 16% 1	300
	21st to end	Day	29% 22% 37% 10% 2	249
March	1st to 10th	Day	28% 21% 30% 16% 5%	300
	11th to 20th	Day	20% 30% 34% 12% 3 1	300
	21st to end	Day	23% 18% 42% 13% 3	330
April	1st to 10th	Day	23% 19% 37% 19% 2	300
	11th to 20th	Day	28% 17% 23% 22% 10%	477
	21st to end	Day	19% 14% 35% 22% 9% 1	500
May	1st to 10th	Day	20% 14% 32% 24% 10%	531
	11th to 20th	Day	12% 11% 30% 30% 13% 3	725
	21st to end	Day	12% 9% 29% 33% 14% 4	789
June	1st to 10th	Day	8% 3 19% 31% 29% 10%	730
	11th to 20th	Day	7% 3 20% 36% 25% 9%	730
	21st to end	Day	8% 3 13% 31% 31% 14%	730
July	1st to 10th	Day	8% 2 8% 31% 33% 18%	721
	11th to 20th	Day	5% 1 6% 29% 41% 18%	718
	21st to end	Day	8% 2 5% 28% 40% 17%	794
August	1st to 10th	Day	4 1 6% 25% 45% 21%	726
	11th to 20th	Day	4 1 2 21% 49% 23%	602
	21st to end	Day	12% 2 5% 21% 36% 25%	583
September	1st to 10th	Day	7% 2 10% 28% 36% 16%	344
	11th to 20th	Day	11% 3 10% 30% 35% 11%	330
	21st to end	Day	10% 2 14% 37% 29% 8%	330
October	1st to 10th	Day	5% 3 21% 43% 22% 5%	330
	11th to 20th	Day	7% 7% 25% 39% 16% 5%	330
	21st to end	Day	20% 10% 24% 29% 13% 4	363
November	1st to 10th	Day	16% 9% 26% 33% 14% 2	330
	11th to 20th	Day	17% 10% 32% 32% 8% 1	330
	21st to end	Day	20% 19% 31% 21% 7% 2	330
December	1st to 10th	Day	24% 14% 35% 17% 6% 3	330
	11th to 20th	Day	24% 14% 37% 20% 5% 1	330
	21st to end	Day	23% 16% 32% 22% 5% 1	363
January	1st to 10th	Night	25% 12% 31% 26% 6%	1050
	11th to 20th	Night	23% 14% 28% 27% 7%	1050
	21st to end	Night	26% 13% 28% 29% 5%	1155
February	1st to 10th	Night	27% 14% 31% 25% 3	967
	11th to 20th	Night	29% 15% 30% 23% 4	744
	21st to end	Night	26% 15% 33% 23% 2	495
March	1st to 10th	Night	27% 12% 32% 25% 4	600
	11th to 20th	Night	20% 13% 35% 27% 5%	600
	21st to end	Night	19% 11% 40% 23% 7%	660
April	1st to 10th	Night	19% 11% 39% 25% 6%	600
	11th to 20th	Night	22% 11% 31% 29% 7%	593
	21st to end	Night	22% 10% 31% 29% 8%	600
May	1st to 10th	Night	17% 12% 33% 31% 7%	600
	11th to 20th	Night	16% 6% 30% 33% 13% 1	591
	21st to end	Night	9% 6% 29% 36% 18% 2	650
June	1st to 10th	Night	7% 3 15% 42% 29% 4	600
	11th to 20th	Night	5% 2 21% 44% 25% 3	600
	21st to end	Night	7% 2 13% 37% 34% 7%	600
July	1st to 10th	Night	5% 1 8% 42% 35% 9%	585
	11th to 20th	Night	4 1 5% 43% 41% 7%	582
	21st to end	Night	4 3 5% 41% 42% 5%	657
August	1st to 10th	Night	2 1 6% 42% 44% 6%	597
	11th to 20th	Night	5% 1 4 42% 41% 7%	594
	21st to end	Night	8% 1 5% 29% 49% 8%	660
September	1st to 10th	Night	6% 2 8% 30% 47% 8%	600
	11th to 20th	Night	12% 1 8% 30% 42% 7%	600
	21st to end	Night	9% 2 11% 33% 40% 6%	600
October	1st to 10th	Night	6% 3 13% 36% 38% 4	725
	11th to 20th	Night	11% 5% 24% 37% 22% 2	800
	21st to end	Night	15% 8% 24% 31% 20% 2	880
November	1st to 10th	Night	15% 5% 23% 34% 22% 2	820
	11th to 20th	Night	13% 10% 26% 36% 14% 1	840
	21st to end	Night	20% 11% 29% 28% 12% 1	887
December	1st to 10th	Night	25% 10% 25% 28% 11% 1	1050
	11th to 20th	Night	27% 11% 28% 28% 6%	1050
	21st to end	Night	25% 11% 27% 30% 7%	1155

Page generated at 2026-01-29 00:21:44. Version ac07

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