Cleburne
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Cleburne clear sky chart from 2005-11-06 to 2024-01-27.

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% 4 2 4 4 3 4 4 5% 7% 52%	75041
	Night	9% 4 2 4 3 2 3 4 5% 7% 57%	75028
Transparency	Day	31% 6% 10% 23% 22% 9%	74766
	Night	28% 5% 10% 22% 24% 12%	74823
Seeing	Day	10% 7% 24% 29% 23% 7%	13991
	Night	11% 7% 30% 35% 15% 1	24035

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	11% 6% 2 4 3 1 3 3 4 5% 57%	1707
	11th to 20th	Day	12% 6% 3 4 4 2 2 3 5% 5% 55%	1710
	21st to end	Day	14% 5% 2 4 2 2 3 3 3 6% 55%	1836
February	1st to 10th	Day	16% 5% 2 6% 4 2 3 3 4 6% 49%	1786
	11th to 20th	Day	15% 7% 3 5% 4 3 3 4 2 5% 48%	1749
	21st to end	Day	20% 6% 2 3 3 1 2 2 3 5% 53%	1480
March	1st to 10th	Day	16% 6% 2 4 5% 2 4 5% 4 6% 46%	1976
	11th to 20th	Day	13% 6% 3 5% 5% 3 4 4 5% 5% 47%	1980
	21st to end	Day	11% 5% 2 5% 5% 3 4 3 4 6% 51%	2178
April	1st to 10th	Day	10% 5% 3 5% 4 3 3 5% 5% 6% 50%	1980
	11th to 20th	Day	13% 5% 3 4 4 2 4 5% 5% 7% 48%	2005
	21st to end	Day	11% 5% 2 5% 5% 3 5% 4 5% 6% 50%	2326
May	1st to 10th	Day	12% 4 3 5% 4 3 4 5% 5% 7% 48%	2340
	11th to 20th	Day	12% 5% 2 5% 4 3 4 5% 6% 7% 45%	2302
	21st to end	Day	11% 6% 3 6% 6% 4 5% 5% 6% 9% 40%	2531
June	1st to 10th	Day	5% 3 1 4 5% 3 4 6% 6% 9% 53%	2340
	11th to 20th	Day	4 3 2 4 5% 3 4 5% 6% 9% 55%	2340
	21st to end	Day	5% 4 2 4 5% 3 5% 5% 6% 9% 53%	2340
July	1st to 10th	Day	7% 5% 3 5% 4 3 6% 6% 7% 10% 44%	2340
	11th to 20th	Day	3 2 1 2 4 3 4 4 6% 9% 62%	2340
	21st to end	Day	3 2 2 4 5% 3 5% 6% 8% 11% 51%	2546
August	1st to 10th	Day	2 1 1 2 3 3 4 5% 7% 9% 64%	2328
	11th to 20th	Day	7% 3 1 4 5% 3 5% 6% 7% 9% 50%	2297
	21st to end	Day	5% 3 2 4 4 3 5% 6% 7% 9% 52%	2268
September	1st to 10th	Day	8% 4 2 4 5% 3 5% 5% 5% 6% 53%	1980
	11th to 20th	Day	10% 5% 3 6% 5% 2 5% 4 5% 7% 46%	1980
	21st to end	Day	6% 4 1 4 4 2 4 4 5% 7% 59%	1980
October	1st to 10th	Day	4 3 2 3 3 3 4 4 5% 6% 62%	1969
	11th to 20th	Day	11% 4 2 3 3 2 3 3 4 5% 60%	1800
	21st to end	Day	13% 3 2 4 3 2 2 3 3 4 62%	1980
November	1st to 10th	Day	11% 5% 2 4 4 2 3 3 4 5% 56%	1858
	11th to 20th	Day	6% 3 2 4 4 3 4 4 4 6% 60%	1753
	21st to end	Day	15% 5% 3 4 3 2 4 3 3 4 54%	1710
December	1st to 10th	Day	13% 5% 1 4 3 2 3 4 5% 6% 53%	1710
	11th to 20th	Day	13% 6% 3 6% 6% 3 4 3 4 5% 48%	2161
	21st to end	Day	16% 6% 2 4 5% 2 3 3 4 5% 51%	3135
January	1st to 10th	Night	10% 4 2 3 3 2 2 4 4 6% 58%	2458
	11th to 20th	Night	14% 5% 2 3 3 2 3 4 4 5% 57%	2470
	21st to end	Night	13% 6% 2 4 3 2 3 3 4 5% 54%	2665
February	1st to 10th	Night	14% 6% 2 5% 4 2 3 3 3 5% 53%	2187
	11th to 20th	Night	14% 6% 2 5% 4 2 4 3 4 5% 51%	2098
	21st to end	Night	17% 5% 3 3 3 2 3 3 4 5% 52%	1776
March	1st to 10th	Night	14% 5% 2 6% 4 2 4 4 5% 7% 46%	1982
	11th to 20th	Night	13% 5% 3 4 4 2 4 4 5% 5% 52%	1980
	21st to end	Night	8% 6% 2 4 3 2 4 3 4 7% 55%	2178
April	1st to 10th	Night	8% 5% 3 4 3 2 4 3 5% 8% 55%	1980
	11th to 20th	Night	11% 4 2 5% 4 2 4 3 5% 7% 53%	1901
	21st to end	Night	11% 4 2 3 4 2 3 3 5% 7% 56%	1630
May	1st to 10th	Night	9% 5% 2 5% 4 2 4 4 5% 8% 52%	1620
	11th to 20th	Night	10% 4 2 5% 4 2 5% 4 7% 7% 49%	1593
	21st to end	Night	8% 4 1 4 5% 2 4 4 7% 10% 51%	1745
June	1st to 10th	Night	3 2 1 4 3 3 4 4 6% 10% 60%	1620
	11th to 20th	Night	3 2 1 3 2 2 3 4 6% 9% 65%	1620
	21st to end	Night	3 3 2 3 4 3 4 4 6% 10% 58%	1620
July	1st to 10th	Night	3 4 2 3 4 2 4 5% 7% 13% 52%	1620
	11th to 20th	Night	3 1 1 2 3 2 2 3 4 9% 70%	1620
	21st to end	Night	1 1 1 3 3 2 5% 5% 5% 11% 61%	1772
August	1st to 10th	Night	2 1 1 1 1 1 2 2 5% 11% 73%	1611
	11th to 20th	Night	4 4 1 4 5% 3 4 4 5% 9% 58%	1600
	21st to end	Night	4 2 1 3 3 3 4 5% 6% 11% 57%	2085
September	1st to 10th	Night	7% 4 2 3 5% 2 4 4 5% 8% 55%	1980
	11th to 20th	Night	10% 5% 2 5% 4 2 4 4 6% 7% 52%	1980
	21st to end	Night	6% 3 1 3 3 2 4 4 5% 8% 61%	1980
October	1st to 10th	Night	5% 3 1 3 3 1 4 4 4 7% 65%	1980
	11th to 20th	Night	10% 3 1 3 3 2 2 3 5% 5% 63%	2151
	21st to end	Night	15% 4 1 3 2 2 2 2 3 4 62%	2376
November	1st to 10th	Night	10% 4 2 4 4 2 3 3 2 4 62%	2220
	11th to 20th	Night	6% 4 1 4 4 2 3 4 5% 6% 61%	2422
	21st to end	Night	15% 5% 2 4 3 2 3 3 4 5% 53%	2470
December	1st to 10th	Night	11% 5% 2 4 3 2 3 4 4 7% 55%	2470
	11th to 20th	Night	11% 6% 3 6% 4 2 3 4 4 6% 52%	3036
	21st to end	Night	15% 7% 2 3 3 2 2 3 3 5% 56%	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	29% 4 6% 21% 29% 10%	1708
	11th to 20th	Day	33% 3 6% 22% 27% 9%	1710
	21st to end	Day	32% 3 7% 16% 28% 13%	1836
February	1st to 10th	Day	37% 4 7% 18% 22% 13%	1786
	11th to 20th	Day	40% 3 7% 19% 20% 11%	1759
	21st to end	Day	38% 3 5% 15% 23% 17%	1480
March	1st to 10th	Day	39% 5% 7% 15% 22% 12%	1976
	11th to 20th	Day	39% 5% 9% 15% 23% 9%	1980
	21st to end	Day	35% 5% 10% 21% 20% 10%	2178
April	1st to 10th	Day	34% 5% 11% 19% 19% 11%	1980
	11th to 20th	Day	36% 6% 8% 19% 21% 10%	2005
	21st to end	Day	34% 6% 8% 21% 25% 7%	2326
May	1st to 10th	Day	35% 6% 9% 22% 19% 9%	2340
	11th to 20th	Day	37% 7% 12% 21% 19% 4	2306
	21st to end	Day	39% 7% 13% 23% 15% 2	2531
June	1st to 10th	Day	25% 8% 14% 30% 18% 5%	2340
	11th to 20th	Day	25% 6% 13% 30% 19% 6%	2340
	21st to end	Day	27% 6% 12% 24% 25% 5%	2340
July	1st to 10th	Day	32% 9% 17% 26% 14% 2	2276
	11th to 20th	Day	17% 6% 15% 34% 22% 5%	2271
	21st to end	Day	21% 9% 18% 33% 19% 1	2405
August	1st to 10th	Day	14% 7% 16% 33% 26% 4	2314
	11th to 20th	Day	29% 8% 14% 27% 19% 2	2297
	21st to end	Day	26% 7% 13% 30% 20% 4	2268
September	1st to 10th	Day	30% 7% 8% 21% 24% 9%	1980
	11th to 20th	Day	35% 8% 10% 20% 19% 8%	1980
	21st to end	Day	24% 4 9% 23% 26% 13%	1980
October	1st to 10th	Day	22% 5% 11% 24% 21% 17%	1969
	11th to 20th	Day	27% 4 7% 16% 26% 21%	1800
	21st to end	Day	29% 3 6% 19% 26% 19%	1980
November	1st to 10th	Day	31% 4 8% 22% 24% 12%	1858
	11th to 20th	Day	25% 4 9% 21% 27% 13%	1753
	21st to end	Day	37% 3 4 20% 23% 12%	1710
December	1st to 10th	Day	33% 4 9% 23% 24% 8%	1710
	11th to 20th	Day	39% 4 7% 15% 25% 11%	2159
	21st to end	Day	36% 4 5% 21% 24% 11%	3135
January	1st to 10th	Night	28% 3 6% 19% 29% 15%	2458
	11th to 20th	Night	31% 3 6% 20% 27% 12%	2470
	21st to end	Night	33% 4 5% 16% 25% 17%	2665
February	1st to 10th	Night	36% 3 7% 15% 22% 17%	2187
	11th to 20th	Night	36% 3 7% 16% 26% 11%	2098
	21st to end	Night	36% 3 7% 15% 19% 19%	1776
March	1st to 10th	Night	38% 4 8% 15% 21% 14%	1982
	11th to 20th	Night	34% 5% 11% 15% 25% 11%	1980
	21st to end	Night	29% 5% 11% 21% 25% 9%	2178
April	1st to 10th	Night	28% 5% 9% 24% 19% 15%	1980
	11th to 20th	Night	32% 5% 10% 18% 20% 15%	1901
	21st to end	Night	29% 5% 10% 19% 30% 7%	1630
May	1st to 10th	Night	30% 6% 10% 25% 20% 10%	1620
	11th to 20th	Night	31% 7% 16% 23% 20% 3	1594
	21st to end	Night	28% 7% 17% 27% 18% 3	1746
June	1st to 10th	Night	20% 7% 13% 34% 20% 6%	1620
	11th to 20th	Night	16% 6% 15% 33% 23% 7%	1620
	21st to end	Night	21% 8% 12% 27% 25% 7%	1620
July	1st to 10th	Night	22% 9% 15% 36% 14% 3	1575
	11th to 20th	Night	11% 4 13% 38% 26% 7%	1566
	21st to end	Night	16% 6% 20% 35% 22% 2	1673
August	1st to 10th	Night	9% 4 14% 39% 29% 5%	1601
	11th to 20th	Night	23% 6% 15% 29% 21% 5%	1600
	21st to end	Night	20% 6% 14% 34% 22% 4	2085
September	1st to 10th	Night	26% 6% 10% 23% 24% 10%	1980
	11th to 20th	Night	31% 7% 13% 18% 21% 11%	1980
	21st to end	Night	22% 3 10% 22% 26% 17%	1980
October	1st to 10th	Night	20% 4 10% 27% 21% 19%	1980
	11th to 20th	Night	25% 4 8% 16% 24% 23%	2151
	21st to end	Night	29% 3 5% 17% 26% 21%	2376
November	1st to 10th	Night	28% 3 7% 20% 28% 15%	2220
	11th to 20th	Night	25% 4 8% 21% 26% 16%	2422
	21st to end	Night	35% 3 6% 17% 26% 13%	2470
December	1st to 10th	Night	30% 4 8% 23% 23% 13%	2470
	11th to 20th	Night	35% 3 6% 15% 27% 14%	3037
	21st to end	Night	33% 3 5% 17% 26% 16%	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	16% 15% 38% 26% 5%	270
	11th to 20th	Day	16% 18% 34% 24% 6% 2	270
	21st to end	Day	18% 16% 39% 19% 7%	282
February	1st to 10th	Day	20% 15% 37% 23% 5%	240
	11th to 20th	Day	24% 15% 42% 16% 3	240
	21st to end	Day	28% 15% 37% 18% 2 1	198
March	1st to 10th	Day	19% 23% 33% 21% 4	240
	11th to 20th	Day	18% 17% 38% 20% 5% 2	240
	21st to end	Day	12% 14% 47% 19% 7%	264
April	1st to 10th	Day	14% 17% 42% 20% 8%	240
	11th to 20th	Day	16% 16% 37% 23% 9%	283
	21st to end	Day	14% 17% 37% 22% 8% 2	586
May	1st to 10th	Day	12% 11% 39% 31% 6% 1	603
	11th to 20th	Day	14% 7% 30% 32% 13% 4	625
	21st to end	Day	13% 5% 30% 31% 17% 4	679
June	1st to 10th	Day	5% 1 19% 39% 27% 9%	630
	11th to 20th	Day	4 2 19% 44% 25% 6%	630
	21st to end	Day	3 2 12% 39% 33% 10%	630
July	1st to 10th	Day	6% 1 10% 33% 36% 14%	621
	11th to 20th	Day	1 6% 30% 48% 14%	618
	21st to end	Day	2 1 5% 29% 47% 16%	684
August	1st to 10th	Day	2 1 4 35% 46% 12%	626
	11th to 20th	Day	8% 1 6% 29% 44% 12%	611
	21st to end	Day	4 10% 26% 33% 28%	387
September	1st to 10th	Day	7% 1 3 23% 43% 23%	270
	11th to 20th	Day	4 7% 25% 46% 18%	270
	21st to end	Day	10% 2 7% 30% 35% 16%	270
October	1st to 10th	Day	3 2 18% 34% 34% 9%	270
	11th to 20th	Day	9% 6% 29% 33% 19% 4	270
	21st to end	Day	24% 11% 24% 23% 16% 3	297
November	1st to 10th	Day	16% 5% 33% 29% 12% 4	270
	11th to 20th	Day	9% 10% 32% 31% 14% 3	270
	21st to end	Day	16% 16% 37% 19% 11% 1	270
December	1st to 10th	Day	14% 9% 37% 26% 12% 1	270
	11th to 20th	Day	17% 12% 36% 27% 8%	270
	21st to end	Day	19% 11% 40% 23% 7%	297
January	1st to 10th	Night	13% 9% 38% 32% 7%	950
	11th to 20th	Night	17% 13% 33% 31% 5%	950
	21st to end	Night	16% 12% 36% 30% 6%	1025
February	1st to 10th	Night	18% 11% 39% 27% 4	747
	11th to 20th	Night	17% 12% 42% 27% 1	704
	21st to end	Night	22% 13% 44% 19% 2	592
March	1st to 10th	Night	16% 12% 40% 26% 5%	542
	11th to 20th	Night	15% 9% 43% 27% 6%	540
	21st to end	Night	12% 12% 42% 30% 4	594
April	1st to 10th	Night	9% 13% 47% 24% 6%	540
	11th to 20th	Night	14% 11% 42% 27% 5%	533
	21st to end	Night	11% 10% 46% 25% 8%	540
May	1st to 10th	Night	10% 10% 42% 32% 5% 1	540
	11th to 20th	Night	11% 5% 38% 32% 13% 2	531
	21st to end	Night	8% 4 34% 38% 15% 2	584
June	1st to 10th	Night	4 1 21% 46% 25% 3	540
	11th to 20th	Night	3 2 27% 52% 16%	540
	21st to end	Night	2 1 20% 45% 29% 3	540
July	1st to 10th	Night	5% 1 11% 47% 33% 3	525
	11th to 20th	Night	3 10% 52% 34% 2	522
	21st to end	Night	1 5% 50% 39% 4	591
August	1st to 10th	Night	1 1 7% 48% 40% 3	537
	11th to 20th	Night	5% 1 7% 45% 37% 5%	534
	21st to end	Night	5% 1 5% 43% 41% 6%	594
September	1st to 10th	Night	8% 1 9% 42% 35% 4	540
	11th to 20th	Night	11% 2 10% 38% 36% 3	540
	21st to end	Night	7% 1 14% 43% 32% 3	540
October	1st to 10th	Night	7% 2 20% 44% 24% 3	540
	11th to 20th	Night	12% 5% 27% 39% 16% 2	711
	21st to end	Night	17% 7% 29% 31% 14% 1	792
November	1st to 10th	Night	10% 5% 31% 39% 15% 1	740
	11th to 20th	Night	7% 9% 35% 34% 14% 1	902
	21st to end	Night	17% 11% 35% 26% 10% 1	950
December	1st to 10th	Night	14% 9% 36% 34% 7% 1	950
	11th to 20th	Night	17% 9% 37% 31% 6%	950
	21st to end	Night	17% 10% 36% 31% 6%	1045

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