Burleson
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Burleson clear sky chart from 2005-11-06 to 2026-06-01.

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	10% 5% 2 5% 3 3 4 3 5% 7% 53%	132428
	Night	10% 5% 2 4 3 3 3 3 5% 7% 57%	131036
Transparency	Day	30% 5% 10% 23% 23% 9%	136158
	Night	28% 4 9% 22% 25% 12%	135370
Seeing	Day	11% 9% 25% 29% 21% 6%	17169
	Night	11% 8% 30% 35% 14% 1	27108

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	10% 6% 2 4 3 3 3 3 4 6% 56%	5289
	11th to 20th	Day	7% 4 2 4 3 2 3 2 4 5% 64%	5310
	21st to end	Day	21% 8% 3 5% 4 3 2 2 3 4 45%	5812
February	1st to 10th	Day	13% 8% 2 6% 4 3 3 2 5% 5% 49%	2071
	11th to 20th	Day	14% 8% 3 6% 3 3 4 3 3 5% 49%	2049
	21st to end	Day	18% 6% 2 4 2 2 2 2 3 4 56%	1730
March	1st to 10th	Day	13% 6% 2 5% 3 3 3 3 5% 6% 52%	5044
	11th to 20th	Day	11% 5% 1 5% 3 3 4 3 4 5% 56%	5090
	21st to end	Day	9% 6% 2 5% 4 4 4 3 6% 8% 50%	5583
April	1st to 10th	Day	10% 6% 2 6% 3 4 4 3 6% 7% 48%	2310
	11th to 20th	Day	13% 6% 2 6% 4 3 4 3 6% 6% 47%	2352
	21st to end	Day	13% 5% 2 6% 4 4 5% 4 6% 6% 47%	2714
May	1st to 10th	Day	15% 7% 3 7% 4 4 4 3 5% 7% 42%	5992
	11th to 20th	Day	12% 6% 3 7% 5% 4 4 3 5% 6% 46%	5992
	21st to end	Day	12% 7% 2 7% 5% 5% 5% 4 6% 8% 40%	6577
June	1st to 10th	Day	4 3 1 4 4 5% 5% 4 7% 11% 52%	2601
	11th to 20th	Day	4 4 1 4 5% 4 5% 4 6% 9% 54%	2600
	21st to end	Day	4 4 1 4 4 4 4 5% 6% 9% 55%	2600
July	1st to 10th	Day	8% 7% 3 8% 5% 4 5% 4 6% 8% 43%	5900
	11th to 20th	Day	3 2 1 3 3 3 4 3 6% 11% 61%	5900
	21st to end	Day	3 3 2 4 3 4 4 4 7% 11% 54%	6422
August	1st to 10th	Day	1 1 2 2 3 4 3 5% 8% 71%	4234
	11th to 20th	Day	4 2 1 3 3 2 4 3 5% 10% 63%	4171
	21st to end	Day	3 3 1 4 3 4 4 4 7% 10% 58%	4124
September	1st to 10th	Day	9% 4 2 5% 4 4 5% 3 4 6% 55%	2200
	11th to 20th	Day	11% 4 2 6% 4 4 4 4 6% 7% 49%	2200
	21st to end	Day	6% 3 1 4 3 3 4 4 6% 7% 59%	2200
October	1st to 10th	Day	4 2 1 3 3 3 3 3 4 7% 65%	2180
	11th to 20th	Day	10% 3 1 4 2 2 3 3 3 5% 63%	2000
	21st to end	Day	12% 4 1 4 2 3 3 2 3 4 62%	2200
November	1st to 10th	Day	12% 6% 2 4 3 2 2 3 4 5% 57%	2058
	11th to 20th	Day	6% 3 1 4 3 3 4 2 4 6% 62%	1935
	21st to end	Day	13% 6% 2 4 3 3 3 2 3 6% 54%	1890
December	1st to 10th	Day	16% 6% 2 4 3 3 3 3 5% 6% 50%	3030
	11th to 20th	Day	14% 7% 3 6% 4 4 3 3 4 4 49%	3481
	21st to end	Day	15% 7% 2 5% 3 3 3 2 3 4 52%	4587
January	1st to 10th	Night	11% 4 2 4 2 3 3 2 4 5% 59%	7634
	11th to 20th	Night	7% 2 1 3 2 2 2 2 3 4 71%	7680
	21st to end	Night	21% 7% 2 5% 3 3 3 3 4 6% 43%	8402
February	1st to 10th	Night	13% 6% 2 5% 3 3 4 2 4 5% 54%	2567
	11th to 20th	Night	13% 7% 2 5% 4 3 3 2 4 5% 51%	2458
	21st to end	Night	16% 6% 1 3 3 3 2 3 4 4 55%	2076
March	1st to 10th	Night	13% 7% 3 7% 5% 4 3 3 5% 6% 48%	5029
	11th to 20th	Night	10% 5% 2 4 3 3 3 3 5% 6% 56%	5090
	21st to end	Night	10% 6% 2 5% 4 3 4 3 4 5% 54%	5588
April	1st to 10th	Night	9% 5% 2 5% 3 3 3 3 6% 7% 54%	2310
	11th to 20th	Night	12% 5% 2 5% 3 3 4 3 5% 6% 52%	2214
	21st to end	Night	11% 5% 2 4 3 3 3 2 5% 8% 53%	1901
May	1st to 10th	Night	14% 8% 3 6% 4 3 3 3 6% 7% 42%	4143
	11th to 20th	Night	9% 7% 3 6% 4 4 4 3 5% 6% 49%	4143
	21st to end	Night	10% 5% 2 5% 4 4 4 4 6% 9% 47%	4542
June	1st to 10th	Night	4 3 1 4 4 3 5% 4 6% 10% 57%	1800
	11th to 20th	Night	3 3 1 3 3 3 3 3 6% 8% 66%	1800
	21st to end	Night	2 2 1 3 3 4 4 3 7% 10% 60%	1800
July	1st to 10th	Night	6% 5% 2 6% 4 4 4 4 7% 11% 48%	4078
	11th to 20th	Night	2 2 1 3 2 2 3 3 5% 10% 67%	4077
	21st to end	Night	2 3 1 4 3 4 4 4 6% 8% 62%	4449
August	1st to 10th	Night	1 1 1 1 1 2 2 4 9% 79%	2926
	11th to 20th	Night	3 2 1 2 2 2 2 3 6% 11% 67%	2888
	21st to end	Night	3 2 1 3 3 2 3 3 5% 10% 64%	3772
September	1st to 10th	Night	8% 5% 2 4 4 3 3 4 6% 7% 56%	2200
	11th to 20th	Night	10% 5% 2 4 3 2 4 3 5% 8% 53%	2200
	21st to end	Night	6% 3 1 4 2 2 4 3 5% 9% 61%	2200
October	1st to 10th	Night	5% 2 1 3 3 3 3 3 4 7% 68%	2200
	11th to 20th	Night	9% 4 1 3 2 2 2 2 3 5% 66%	2398
	21st to end	Night	13% 4 1 4 2 2 2 2 3 4 63%	2640
November	1st to 10th	Night	9% 4 2 4 3 3 3 2 3 4 62%	2460
	11th to 20th	Night	5% 4 2 4 3 2 2 3 6% 7% 63%	2682
	21st to end	Night	13% 6% 2 4 3 3 3 3 4 5% 54%	2730
December	1st to 10th	Night	15% 6% 2 5% 3 3 3 3 3 4 54%	4380
	11th to 20th	Night	13% 6% 2 6% 3 3 3 3 3 5% 52%	4946
	21st to end	Night	12% 7% 2 5% 3 3 3 2 3 4 57%	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	30% 3 8% 25% 28% 6%	5290
	11th to 20th	Day	23% 2 6% 25% 35% 9%	5310
	21st to end	Day	44% 3 4 17% 21% 11%	5812
February	1st to 10th	Day	38% 4 6% 17% 22% 12%	2071
	11th to 20th	Day	41% 4 7% 18% 21% 9%	2059
	21st to end	Day	36% 2 4 16% 26% 16%	1730
March	1st to 10th	Day	34% 4 6% 14% 22% 19%	5044
	11th to 20th	Day	31% 5% 7% 17% 16% 24%	5090
	21st to end	Day	32% 5% 11% 23% 20% 8%	5585
April	1st to 10th	Day	35% 6% 11% 18% 20% 11%	2310
	11th to 20th	Day	37% 5% 10% 19% 20% 10%	2352
	21st to end	Day	36% 6% 9% 19% 24% 6%	2714
May	1st to 10th	Day	40% 6% 11% 21% 17% 4	6030
	11th to 20th	Day	39% 6% 9% 17% 24% 5%	5996
	21st to end	Day	40% 8% 12% 22% 13% 4	6590
June	1st to 10th	Day	26% 9% 15% 29% 18% 4	2601
	11th to 20th	Day	26% 6% 13% 29% 20% 6%	2600
	21st to end	Day	25% 7% 14% 26% 24% 5%	2600
July	1st to 10th	Day	38% 6% 16% 29% 10% 1	5836
	11th to 20th	Day	17% 5% 17% 36% 22% 3	5831
	21st to end	Day	21% 7% 16% 31% 23% 2	6240
August	1st to 10th	Day	11% 5% 12% 30% 37% 5%	4220
	11th to 20th	Day	18% 5% 15% 38% 23% 2	4210
	21st to end	Day	21% 8% 19% 34% 16% 2	4123
September	1st to 10th	Day	31% 5% 9% 20% 24% 11%	2200
	11th to 20th	Day	34% 6% 11% 20% 22% 7%	2200
	21st to end	Day	23% 6% 9% 23% 26% 14%	2200
October	1st to 10th	Day	12% 4 6% 14% 35% 29%	3557
	11th to 20th	Day	17% 2 6% 20% 33% 22%	3240
	21st to end	Day	21% 4 6% 26% 32% 12%	3538
November	1st to 10th	Day	31% 4 8% 20% 26% 11%	2058
	11th to 20th	Day	24% 4 8% 22% 28% 13%	1935
	21st to end	Day	35% 3 4 22% 25% 11%	1890
December	1st to 10th	Day	36% 3 7% 23% 25% 6%	3030
	11th to 20th	Day	39% 4 6% 11% 28% 12%	3479
	21st to end	Day	37% 4 5% 23% 22% 10%	4587
January	1st to 10th	Night	28% 3 7% 22% 32% 8%	7635
	11th to 20th	Night	18% 2 5% 20% 37% 19%	7680
	21st to end	Night	43% 3 5% 15% 21% 12%	8402
February	1st to 10th	Night	35% 3 8% 17% 22% 15%	2567
	11th to 20th	Night	36% 3 8% 17% 26% 10%	2458
	21st to end	Night	34% 3 7% 14% 23% 18%	2076
March	1st to 10th	Night	39% 4 6% 13% 21% 18%	5029
	11th to 20th	Night	29% 4 8% 17% 17% 24%	5090
	21st to end	Night	33% 4 7% 19% 29% 8%	5588
April	1st to 10th	Night	29% 5% 9% 21% 20% 15%	2310
	11th to 20th	Night	33% 6% 10% 17% 20% 14%	2214
	21st to end	Night	30% 6% 11% 20% 27% 6%	1901
May	1st to 10th	Night	40% 6% 11% 23% 14% 6%	4170
	11th to 20th	Night	35% 6% 13% 17% 22% 6%	4144
	21st to end	Night	33% 7% 14% 28% 11% 9%	4551
June	1st to 10th	Night	22% 7% 14% 32% 20% 5%	1800
	11th to 20th	Night	17% 6% 14% 33% 23% 7%	1800
	21st to end	Night	19% 8% 13% 27% 27% 6%	1800
July	1st to 10th	Night	30% 6% 17% 35% 11% 1	4035
	11th to 20th	Night	15% 4 15% 37% 25% 4	4026
	21st to end	Night	19% 6% 17% 32% 23% 3	4320
August	1st to 10th	Night	6% 3 10% 34% 41% 6%	2916
	11th to 20th	Night	13% 4 15% 39% 24% 4	2915
	21st to end	Night	16% 7% 20% 35% 19% 3	3772
September	1st to 10th	Night	26% 7% 11% 21% 24% 11%	2200
	11th to 20th	Night	29% 6% 13% 20% 22% 10%	2200
	21st to end	Night	20% 5% 10% 22% 27% 17%	2200
October	1st to 10th	Night	12% 2 6% 16% 28% 36%	3590
	11th to 20th	Night	15% 2 6% 20% 31% 26%	3897
	21st to end	Night	22% 3 4 21% 35% 15%	4252
November	1st to 10th	Night	27% 4 6% 20% 28% 15%	2460
	11th to 20th	Night	22% 5% 9% 21% 28% 16%	2682
	21st to end	Night	33% 3 7% 17% 27% 12%	2730
December	1st to 10th	Night	35% 4 5% 19% 26% 11%	4380
	11th to 20th	Night	37% 3 5% 12% 28% 15%	4947
	21st to end	Night	33% 3 7% 18% 26% 13%	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	15% 18% 40% 22% 5%	330
	11th to 20th	Day	14% 19% 41% 19% 6% 1	330
	21st to end	Day	18% 19% 38% 19% 7% 1	363
February	1st to 10th	Day	17% 18% 38% 22% 4	330
	11th to 20th	Day	20% 21% 41% 15% 3	330
	21st to end	Day	22% 19% 42% 14% 4	273
March	1st to 10th	Day	19% 24% 31% 22% 4	330
	11th to 20th	Day	17% 23% 35% 19% 4 1	330
	21st to end	Day	12% 17% 45% 19% 7%	363
April	1st to 10th	Day	16% 19% 35% 20% 8% 1	330
	11th to 20th	Day	19% 17% 38% 22% 4	390
	21st to end	Day	18% 14% 37% 23% 6% 1	734
May	1st to 10th	Day	14% 13% 36% 31% 5% 1	753
	11th to 20th	Day	17% 8% 33% 28% 12% 2	775
	21st to end	Day	12% 8% 30% 31% 16% 4	844
June	1st to 10th	Day	5% 3 21% 39% 25% 8%	731
	11th to 20th	Day	6% 1 20% 44% 23% 6%	730
	21st to end	Day	3 2 13% 39% 34% 9%	730
July	1st to 10th	Day	7% 2 11% 37% 32% 12%	721
	11th to 20th	Day	2 1 7% 37% 43% 11%	718
	21st to end	Day	2 1 6% 34% 43% 13%	794
August	1st to 10th	Day	2 5% 35% 45% 13%	726
	11th to 20th	Day	7% 2 5% 32% 44% 10%	715
	21st to end	Day	5% 1 7% 27% 36% 25%	473
September	1st to 10th	Day	7% 2 8% 27% 40% 15%	330
	11th to 20th	Day	5% 1 9% 27% 42% 16%	330
	21st to end	Day	9% 3 8% 36% 29% 15%	330
October	1st to 10th	Day	1 2 20% 33% 34% 10%	330
	11th to 20th	Day	8% 6% 31% 33% 18% 5%	330
	21st to end	Day	21% 10% 26% 26% 15% 2	363
November	1st to 10th	Day	18% 10% 31% 26% 12% 3	330
	11th to 20th	Day	9% 11% 34% 33% 10% 3	330
	21st to end	Day	16% 19% 33% 22% 8% 2	330
December	1st to 10th	Day	16% 12% 37% 23% 10% 1	330
	11th to 20th	Day	17% 13% 35% 26% 8% 2	330
	21st to end	Day	20% 13% 37% 23% 7% 1	363
January	1st to 10th	Night	13% 11% 38% 31% 7%	1050
	11th to 20th	Night	16% 14% 34% 30% 5%	1050
	21st to end	Night	15% 14% 35% 30% 6%	1155
February	1st to 10th	Night	16% 12% 40% 27% 3 1	887
	11th to 20th	Night	17% 14% 42% 24% 2	824
	21st to end	Night	19% 15% 42% 22% 2	692
March	1st to 10th	Night	17% 15% 38% 26% 4	630
	11th to 20th	Night	15% 12% 41% 27% 5%	630
	21st to end	Night	11% 15% 39% 30% 4	693
April	1st to 10th	Night	10% 15% 44% 25% 5%	630
	11th to 20th	Night	14% 15% 42% 25% 4	623
	21st to end	Night	14% 10% 43% 27% 6%	630
May	1st to 10th	Night	10% 11% 42% 32% 4 1	630
	11th to 20th	Night	10% 8% 35% 32% 12% 1	621
	21st to end	Night	8% 5% 33% 38% 14% 1	683
June	1st to 10th	Night	5% 3 22% 46% 23% 2	600
	11th to 20th	Night	4 2 25% 54% 14% 1	600
	21st to end	Night	3 19% 48% 28% 3	600
July	1st to 10th	Night	4 2 15% 45% 32% 3	585
	11th to 20th	Night	3 1 11% 55% 29% 2	582
	21st to end	Night	2 1 7% 56% 32% 3	657
August	1st to 10th	Night	2 8% 52% 36% 2	597
	11th to 20th	Night	5% 8% 48% 34% 4	594
	21st to end	Night	4 1 7% 43% 39% 6%	660
September	1st to 10th	Night	9% 1 11% 45% 32% 3	600
	11th to 20th	Night	12% 2 8% 42% 34% 2	600
	21st to end	Night	6% 2 15% 45% 28% 4	600
October	1st to 10th	Night	6% 1 22% 43% 25% 3	600
	11th to 20th	Night	10% 5% 28% 38% 17% 2	798
	21st to end	Night	16% 8% 31% 32% 14% 1	880
November	1st to 10th	Night	11% 4 32% 38% 13% 1	820
	11th to 20th	Night	7% 10% 36% 34% 13%	1002
	21st to end	Night	16% 11% 37% 26% 9% 1	1050
December	1st to 10th	Night	14% 10% 37% 32% 6%	1050
	11th to 20th	Night	17% 9% 35% 31% 7%	1050
	21st to end	Night	15% 11% 36% 31% 6%	1155

Page generated at 2026-05-29 00:53:31. Version ac07

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