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 2024-11-28.

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% 39%	101284
	Night	14% 7% 2 5% 4 4 4 3 5% 8% 45%	98334
Transparency	Day	41% 6% 11% 19% 17% 7%	104959
	Night	37% 6% 12% 20% 18% 9%	102786
Seeing	Day	14% 9% 21% 26% 21% 8%	14968
	Night	16% 8% 23% 32% 19% 2	24808

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 5% 3 3 3 3 4 5% 43%	2847
	11th to 20th	Day	18% 6% 2 4 3 3 2 2 3 5% 51%	2850
	21st to end	Day	24% 8% 2 6% 3 3 3 3 5% 7% 35%	3135
February	1st to 10th	Day	22% 9% 4 6% 4 4 3 3 4 5% 37%	1757
	11th to 20th	Day	21% 8% 2 7% 5% 4 3 2 4 4 39%	1884
	21st to end	Day	22% 8% 3 6% 4 3 4 3 4 6% 39%	1727
March	1st to 10th	Day	19% 9% 4 9% 5% 5% 5% 3 5% 6% 30%	3436
	11th to 20th	Day	20% 8% 3 7% 5% 5% 5% 4 7% 8% 29%	3480
	21st to end	Day	18% 8% 2 6% 5% 4 4 3 5% 6% 40%	3814
April	1st to 10th	Day	15% 8% 3 8% 6% 4 4 4 5% 5% 38%	2090
	11th to 20th	Day	18% 8% 3 6% 5% 5% 4 4 5% 5% 38%	2240
	21st to end	Day	11% 7% 3 7% 5% 4 5% 4 6% 6% 43%	2280
May	1st to 10th	Day	19% 9% 3 8% 5% 5% 5% 4 6% 7% 29%	3817
	11th to 20th	Day	13% 6% 3 6% 4 5% 5% 4 6% 7% 41%	4082
	21st to end	Day	10% 7% 2 8% 6% 6% 6% 5% 7% 11% 33%	4477
June	1st to 10th	Day	7% 4 2 7% 6% 6% 8% 5% 8% 10% 37%	2470
	11th to 20th	Day	5% 4 1 6% 6% 6% 7% 6% 9% 11% 38%	2470
	21st to end	Day	7% 6% 3 9% 7% 8% 7% 8% 8% 9% 30%	2470
July	1st to 10th	Day	8% 5% 2 7% 6% 7% 6% 6% 9% 11% 33%	4120
	11th to 20th	Day	7% 7% 3 8% 7% 7% 7% 6% 8% 10% 29%	4120
	21st to end	Day	16% 8% 3 8% 6% 6% 6% 5% 7% 9% 26%	4465
August	1st to 10th	Day	2 2 1 4 4 4 5% 4 6% 10% 59%	4104
	11th to 20th	Day	3 3 1 4 4 5% 6% 5% 8% 14% 48%	3856
	21st to end	Day	8% 5% 2 7% 6% 6% 7% 5% 7% 10% 37%	4180
September	1st to 10th	Day	8% 5% 2 8% 5% 6% 6% 6% 7% 9% 37%	2104
	11th to 20th	Day	14% 7% 2 6% 5% 5% 5% 4 7% 7% 37%	2090
	21st to end	Day	8% 4 2 6% 5% 6% 5% 4 6% 7% 48%	2090
October	1st to 10th	Day	6% 4 2 5% 4 4 4 3 5% 7% 57%	1952
	11th to 20th	Day	9% 5% 2 6% 4 4 4 4 4 6% 53%	1900
	21st to end	Day	13% 6% 2 4 4 3 3 3 4 5% 53%	2090
November	1st to 10th	Day	12% 5% 2 6% 5% 6% 4 3 5% 5% 47%	1958
	11th to 20th	Day	12% 6% 3 6% 5% 5% 4 3 5% 5% 49%	2000
	21st to end	Day	15% 7% 3 8% 5% 3 3 2 4 5% 45%	1923
December	1st to 10th	Day	16% 9% 3 5% 5% 4 4 4 4 6% 40%	1710
	11th to 20th	Day	16% 8% 3 6% 5% 4 4 3 5% 6% 40%	2161
	21st to end	Day	18% 7% 2 6% 4 3 3 3 4 6% 44%	3135
January	1st to 10th	Night	18% 8% 3 5% 3 3 3 3 4 7% 44%	4108
	11th to 20th	Night	19% 6% 2 5% 3 3 2 2 3 4 51%	4120
	21st to end	Night	23% 10% 2 6% 4 2 3 2 4 7% 37%	4532
February	1st to 10th	Night	20% 10% 3 6% 3 3 3 3 4 6% 39%	2438
	11th to 20th	Night	22% 9% 2 5% 4 3 2 3 4 5% 41%	2180
	21st to end	Night	23% 8% 3 6% 4 3 3 3 4 5% 39%	1727
March	1st to 10th	Night	25% 11% 3 7% 4 4 3 3 4 6% 31%	3419
	11th to 20th	Night	24% 9% 4 8% 5% 4 4 3 5% 5% 30%	3480
	21st to end	Night	14% 8% 3 7% 5% 4 5% 3 4 6% 42%	3817
April	1st to 10th	Night	15% 7% 3 6% 4 5% 4 4 6% 7% 39%	2090
	11th to 20th	Night	18% 6% 2 6% 3 4 4 3 5% 7% 42%	1889
	21st to end	Night	15% 7% 2 6% 4 4 4 3 4 6% 45%	1900
May	1st to 10th	Night	25% 11% 3 7% 5% 4 4 3 5% 7% 27%	3075
	11th to 20th	Night	15% 7% 3 6% 4 4 4 3 5% 6% 42%	2823
	21st to end	Night	13% 8% 3 7% 5% 4 5% 4 7% 11% 35%	3090
June	1st to 10th	Night	6% 4 1 3 4 4 4 4 8% 12% 51%	1710
	11th to 20th	Night	5% 2 1 4 4 4 4 4 6% 12% 54%	1710
	21st to end	Night	5% 5% 2 6% 4 4 5% 5% 8% 11% 44%	1710
July	1st to 10th	Night	6% 5% 2 5% 4 4 5% 4 8% 13% 44%	2850
	11th to 20th	Night	4 4 2 6% 5% 5% 5% 5% 7% 12% 45%	2850
	21st to end	Night	12% 7% 3 8% 4 4 5% 4 6% 10% 37%	3098
August	1st to 10th	Night	1 2 1 2 2 2 3 3 7% 10% 68%	2836
	11th to 20th	Night	2 2 1 2 2 3 3 4 7% 13% 61%	2973
	21st to end	Night	6% 3 2 4 4 5% 6% 5% 8% 12% 45%	3476
September	1st to 10th	Night	5% 5% 2 7% 4 5% 4 4 8% 9% 47%	2071
	11th to 20th	Night	12% 5% 2 6% 4 6% 4 4 6% 8% 42%	2090
	21st to end	Night	8% 4 1 5% 4 3 4 3 5% 9% 54%	2090
October	1st to 10th	Night	5% 3 2 4 3 3 3 4 5% 8% 60%	2209
	11th to 20th	Night	10% 4 2 4 3 2 3 3 5% 5% 61%	2280
	21st to end	Night	12% 5% 2 4 3 3 3 2 3 5% 58%	2508
November	1st to 10th	Night	13% 6% 2 4 3 3 3 4 4 6% 52%	2340
	11th to 20th	Night	11% 6% 2 6% 3 4 3 3 5% 5% 52%	2400
	21st to end	Night	16% 7% 2 5% 3 4 4 3 5% 5% 46%	2407
December	1st to 10th	Night	17% 9% 2 5% 4 4 5% 3 4 5% 42%	2470
	11th to 20th	Night	18% 10% 3 5% 4 3 3 2 4 5% 42%	3036
	21st to end	Night	17% 8% 2 6% 3 3 4 3 4 5% 45%	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	44% 4 5% 16% 22% 10%	2848
	11th to 20th	Day	37% 4 4 20% 28% 8%	2850
	21st to end	Day	48% 4 4 17% 17% 10%	3135
February	1st to 10th	Day	51% 4 5% 13% 16% 11%	1757
	11th to 20th	Day	50% 3 6% 14% 16% 11%	1894
	21st to end	Day	48% 4 8% 13% 16% 10%	1727
March	1st to 10th	Day	54% 5% 9% 12% 15% 4	3436
	11th to 20th	Day	51% 6% 9% 15% 13% 6%	3480
	21st to end	Day	46% 5% 8% 16% 22% 4	3814
April	1st to 10th	Day	48% 6% 6% 16% 16% 8%	2090
	11th to 20th	Day	47% 4 8% 14% 17% 10%	2240
	21st to end	Day	39% 6% 9% 18% 22% 6%	2280
May	1st to 10th	Day	52% 7% 10% 17% 10% 4	3852
	11th to 20th	Day	40% 6% 9% 18% 24% 3	4086
	21st to end	Day	41% 9% 12% 27% 10% 1	4489
June	1st to 10th	Day	38% 8% 15% 22% 15% 1	2470
	11th to 20th	Day	36% 9% 17% 23% 14% 3	2470
	21st to end	Day	45% 10% 15% 21% 9%	2470
July	1st to 10th	Day	42% 7% 28% 20% 3	4056
	11th to 20th	Day	46% 7% 18% 21% 8%	4051
	21st to end	Day	51% 8% 18% 18% 4 1	4325
August	1st to 10th	Day	19% 7% 14% 37% 23%	4090
	11th to 20th	Day	25% 7% 33% 29% 6% 1	3895
	21st to end	Day	41% 9% 16% 18% 14% 1	4179
September	1st to 10th	Day	40% 10% 13% 17% 14% 6%	2104
	11th to 20th	Day	44% 8% 13% 15% 15% 5%	2090
	21st to end	Day	33% 7% 12% 19% 17% 12%	2090
October	1st to 10th	Day	20% 3 5% 14% 19% 39%	3238
	11th to 20th	Day	21% 3 4 18% 34% 19%	3140
	21st to end	Day	27% 3 4 15% 38% 13%	3428
November	1st to 10th	Day	38% 4 10% 17% 20% 10%	1958
	11th to 20th	Day	38% 5% 7% 14% 23% 14%	2000
	21st to end	Day	43% 4 6% 18% 18% 11%	1923
December	1st to 10th	Day	45% 5% 9% 16% 18% 7%	1710
	11th to 20th	Day	43% 5% 7% 15% 20% 10%	2159
	21st to end	Day	42% 4 6% 15% 24% 10%	3135
January	1st to 10th	Night	39% 6% 6% 19% 19% 11%	4108
	11th to 20th	Night	38% 3 5% 17% 27% 9%	4120
	21st to end	Night	49% 3 4 16% 17% 10%	4532
February	1st to 10th	Night	47% 3 7% 13% 17% 14%	2438
	11th to 20th	Night	46% 4 6% 15% 18% 11%	2180
	21st to end	Night	49% 4 6% 13% 15% 13%	1727
March	1st to 10th	Night	55% 5% 7% 14% 13% 6%	3419
	11th to 20th	Night	55% 5% 9% 13% 13% 5%	3480
	21st to end	Night	43% 5% 9% 14% 22% 6%	3817
April	1st to 10th	Night	44% 7% 8% 16% 15% 10%	2090
	11th to 20th	Night	42% 5% 9% 16% 16% 12%	1889
	21st to end	Night	40% 5% 8% 19% 21% 6%	1900
May	1st to 10th	Night	54% 7% 9% 15% 10% 4	3105
	11th to 20th	Night	41% 7% 10% 18% 21% 3	2824
	21st to end	Night	39% 9% 18% 25% 8% 1	3099
June	1st to 10th	Night	24% 9% 19% 31% 17%	1710
	11th to 20th	Night	22% 8% 20% 30% 17% 3	1710
	21st to end	Night	30% 10% 20% 29% 11% 1	1710
July	1st to 10th	Night	31% 7% 35% 23% 4	2805
	11th to 20th	Night	32% 7% 26% 26% 9%	2796
	21st to end	Night	43% 9% 22% 22% 4	2999
August	1st to 10th	Night	12% 5% 18% 43% 21%	2826
	11th to 20th	Night	15% 7% 36% 35% 7%	3000
	21st to end	Night	31% 12% 21% 24% 11% 2	3476
September	1st to 10th	Night	30% 9% 22% 21% 12% 6%	2071
	11th to 20th	Night	38% 7% 15% 18% 15% 6%	2090
	21st to end	Night	28% 6% 14% 21% 19% 12%	2090
October	1st to 10th	Night	17% 4 6% 17% 17% 39%	3690
	11th to 20th	Night	15% 3 4 24% 32% 22%	3779
	21st to end	Night	25% 2 4 14% 39% 15%	4120
November	1st to 10th	Night	33% 4 11% 19% 22% 11%	2340
	11th to 20th	Night	35% 4 9% 18% 22% 13%	2400
	21st to end	Night	40% 4 8% 18% 19% 11%	2407
December	1st to 10th	Night	44% 4 9% 19% 15% 10%	2470
	11th to 20th	Night	45% 3 7% 11% 20% 14%	3037
	21st to end	Night	41% 4 6% 14% 27% 8%	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	26% 17% 37% 13% 6% 1	270
	11th to 20th	Day	28% 15% 31% 20% 4 1	270
	21st to end	Day	25% 21% 33% 18% 4	297
February	1st to 10th	Day	30% 21% 32% 13% 4	270
	11th to 20th	Day	31% 19% 31% 17% 1	270
	21st to end	Day	29% 24% 38% 8% 2	225
March	1st to 10th	Day	27% 21% 31% 16% 5%	270
	11th to 20th	Day	19% 31% 33% 13% 3 1	270
	21st to end	Day	22% 19% 43% 13% 3	297
April	1st to 10th	Day	21% 19% 39% 18% 2	270
	11th to 20th	Day	29% 16% 23% 22% 10%	438
	21st to end	Day	18% 13% 35% 22% 10% 2	460
May	1st to 10th	Day	19% 14% 31% 24% 11%	489
	11th to 20th	Day	12% 10% 29% 31% 14% 3	675
	21st to end	Day	11% 9% 28% 34% 14% 4	734
June	1st to 10th	Day	8% 4 17% 31% 30% 10%	680
	11th to 20th	Day	7% 3 20% 36% 25% 9%	680
	21st to end	Day	9% 3 14% 31% 31% 13%	680
July	1st to 10th	Day	7% 3 8% 30% 34% 18%	671
	11th to 20th	Day	5% 1 5% 29% 41% 18%	668
	21st to end	Day	8% 2 5% 29% 40% 17%	739
August	1st to 10th	Day	3 1 6% 25% 45% 20%	676
	11th to 20th	Day	4 1 2 20% 49% 23%	558
	21st to end	Day	11% 2 6% 20% 36% 25%	539
September	1st to 10th	Day	8% 2 9% 27% 38% 18%	314
	11th to 20th	Day	12% 3 11% 29% 36% 10%	300
	21st to end	Day	9% 2 13% 37% 31% 9%	300
October	1st to 10th	Day	6% 3 22% 42% 23% 5%	300
	11th to 20th	Day	7% 7% 25% 40% 15% 5%	300
	21st to end	Day	21% 10% 24% 28% 13% 4	330
November	1st to 10th	Day	17% 8% 26% 33% 14% 1	300
	11th to 20th	Day	17% 10% 32% 31% 8% 1	300
	21st to end	Day	21% 19% 30% 21% 8% 2	291
December	1st to 10th	Day	21% 14% 34% 20% 7% 4	270
	11th to 20th	Day	25% 16% 37% 19% 3 1	270
	21st to end	Day	24% 16% 34% 20% 5% 1	297
January	1st to 10th	Night	24% 12% 31% 26% 7%	950
	11th to 20th	Night	24% 13% 27% 27% 8%	950
	21st to end	Night	24% 13% 29% 30% 5%	1045
February	1st to 10th	Night	26% 15% 31% 25% 3	918
	11th to 20th	Night	27% 15% 29% 24% 5%	706
	21st to end	Night	27% 16% 33% 23% 2	471
March	1st to 10th	Night	27% 12% 32% 25% 4	570
	11th to 20th	Night	19% 12% 35% 28% 5%	570
	21st to end	Night	18% 11% 40% 23% 7%	627
April	1st to 10th	Night	17% 11% 40% 25% 6%	570
	11th to 20th	Night	21% 11% 31% 29% 7%	563
	21st to end	Night	21% 10% 31% 30% 8%	570
May	1st to 10th	Night	17% 12% 33% 31% 6%	570
	11th to 20th	Night	16% 5% 30% 34% 14% 1	561
	21st to end	Night	8% 6% 29% 36% 19% 2	617
June	1st to 10th	Night	7% 3 15% 42% 29% 5%	570
	11th to 20th	Night	5% 2 20% 45% 25% 4	570
	21st to end	Night	7% 2 13% 38% 33% 7%	570
July	1st to 10th	Night	5% 1 8% 43% 35% 9%	555
	11th to 20th	Night	4 1 5% 42% 40% 7%	552
	21st to end	Night	4 2 5% 42% 42% 5%	624
August	1st to 10th	Night	1 1 6% 43% 45% 5%	567
	11th to 20th	Night	5% 1 4 42% 40% 8%	564
	21st to end	Night	8% 1 5% 29% 49% 8%	627
September	1st to 10th	Night	6% 2 8% 29% 48% 8%	570
	11th to 20th	Night	13% 1 9% 30% 40% 7%	570
	21st to end	Night	9% 2 11% 32% 40% 6%	570
October	1st to 10th	Night	6% 3 13% 35% 39% 4	689
	11th to 20th	Night	11% 5% 24% 37% 21% 1	760
	21st to end	Night	15% 8% 24% 31% 20% 2	836
November	1st to 10th	Night	15% 5% 23% 34% 21% 1	780
	11th to 20th	Night	14% 11% 25% 36% 14% 1	800
	21st to end	Night	20% 10% 28% 28% 13% 1	831
December	1st to 10th	Night	23% 10% 25% 29% 12% 1	950
	11th to 20th	Night	27% 11% 27% 28% 6%	950
	21st to end	Night	24% 11% 28% 29% 7%	1045

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