Cleburne State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Cleburne State Park clear sky chart from 2005-11-06 to 2025-01-22.

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%	105334
	Night	10% 5% 2 4 3 3 3 3 4 6% 57%	104172
Transparency	Day	31% 4 9% 24% 24% 9%	109116
	Night	28% 3 9% 23% 25% 12%	108517
Seeing	Day	12% 6% 23% 29% 23% 7%	15317
	Night	13% 7% 29% 36% 15% 1	25328

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	12% 5% 2 5% 3 2 3 2 3 5% 58%	2937
	11th to 20th	Day	10% 5% 1 4 3 2 2 2 5% 5% 61%	2940
	21st to end	Day	19% 9% 3 5% 2 2 2 2 3 4 49%	3147
February	1st to 10th	Day	14% 6% 2 6% 4 3 2 3 5% 4 49%	1900
	11th to 20th	Day	15% 7% 2 6% 4 3 3 2 3 6% 49%	1849
	21st to end	Day	20% 6% 2 4 2 2 1 2 3 5% 53%	1570
March	1st to 10th	Day	13% 5% 2 5% 3 3 4 3 4 6% 50%	3422
	11th to 20th	Day	17% 6% 2 6% 4 4 4 3 5% 6% 42%	3480
	21st to end	Day	10% 7% 2 7% 4 4 4 4 6% 8% 45%	3814
April	1st to 10th	Day	11% 6% 2 5% 4 4 4 4 4 7% 50%	2090
	11th to 20th	Day	13% 7% 2 5% 3 4 4 3 5% 7% 47%	2109
	21st to end	Day	11% 5% 2 6% 4 4 4 3 5% 5% 50%	2470
May	1st to 10th	Day	17% 6% 3 6% 5% 4 4 3 5% 7% 40%	4082
	11th to 20th	Day	14% 6% 2 5% 4 3 3 3 5% 6% 49%	4082
	21st to end	Day	13% 7% 2 6% 4 4 5% 4 7% 9% 39%	4477
June	1st to 10th	Day	5% 3 2 5% 4 4 4 5% 6% 8% 54%	2470
	11th to 20th	Day	4 3 1 5% 4 4 4 4 6% 9% 55%	2470
	21st to end	Day	4 4 2 5% 4 4 4 4 6% 9% 55%	2470
July	1st to 10th	Day	5% 4 2 5% 4 5% 5% 4 6% 7% 54%	4120
	11th to 20th	Day	3 2 1 3 3 3 3 4 6% 9% 63%	4120
	21st to end	Day	5% 4 2 6% 5% 5% 5% 5% 7% 10% 44%	4465
August	1st to 10th	Day	1 1 2 2 3 4 3 5% 7% 72%	4104
	11th to 20th	Day	4 2 1 3 3 3 4 3 5% 9% 65%	3987
	21st to end	Day	3 2 1 4 4 4 4 4 6% 8% 60%	3998
September	1st to 10th	Day	9% 4 2 6% 4 5% 5% 4 4 6% 53%	2090
	11th to 20th	Day	9% 4 2 7% 5% 3 5% 4 6% 7% 48%	2090
	21st to end	Day	7% 3 2 4 3 3 3 4 5% 7% 60%	2090
October	1st to 10th	Day	6% 2 1 4 2 3 4 3 5% 6% 64%	2090
	11th to 20th	Day	10% 4 1 3 2 2 3 3 4 5% 62%	1900
	21st to end	Day	13% 4 1 5% 2 2 2 1 3 4 63%	2090
November	1st to 10th	Day	13% 6% 2 4 2 3 3 2 4 5% 55%	1958
	11th to 20th	Day	6% 3 2 4 4 4 3 3 4 6% 62%	1834
	21st to end	Day	14% 5% 2 6% 3 2 3 3 4 5% 54%	1800
December	1st to 10th	Day	16% 6% 2 4 3 3 3 3 4 5% 50%	2940
	11th to 20th	Day	16% 7% 2 6% 4 4 4 3 3 4 48%	3391
	21st to end	Day	16% 6% 2 5% 3 3 2 2 3 4 53%	4488
January	1st to 10th	Night	14% 4 2 3 2 2 3 2 3 5% 59%	4238
	11th to 20th	Night	12% 4 1 3 2 2 2 2 3 4 65%	4250
	21st to end	Night	17% 7% 3 5% 3 3 2 2 4 5% 48%	4546
February	1st to 10th	Night	14% 7% 3 5% 3 3 3 2 4 5% 52%	2295
	11th to 20th	Night	15% 7% 1 4 4 3 3 3 4 5% 52%	2218
	21st to end	Night	17% 5% 1 4 3 3 3 2 4 5% 53%	1884
March	1st to 10th	Night	12% 8% 3 7% 5% 4 3 3 4 5% 46%	3431
	11th to 20th	Night	14% 6% 2 5% 4 4 3 3 5% 8% 46%	3480
	21st to end	Night	11% 6% 2 6% 3 4 4 3 5% 6% 50%	3817
April	1st to 10th	Night	9% 5% 2 4 3 3 3 3 6% 7% 54%	2090
	11th to 20th	Night	12% 5% 2 5% 4 4 3 3 5% 6% 52%	2016
	21st to end	Night	10% 6% 2 4 3 3 2 3 5% 7% 55%	1710
May	1st to 10th	Night	20% 9% 2 5% 4 2 2 3 5% 6% 41%	2823
	11th to 20th	Night	9% 6% 3 7% 3 4 3 3 5% 7% 49%	2823
	21st to end	Night	11% 6% 2 4 3 3 3 4 6% 9% 50%	3090
June	1st to 10th	Night	3 3 1 4 3 4 3 3 6% 10% 59%	1710
	11th to 20th	Night	2 3 1 3 3 2 3 3 5% 8% 66%	1710
	21st to end	Night	2 3 2 4 3 3 3 4 7% 9% 59%	1710
July	1st to 10th	Night	3 3 2 3 3 3 3 2 6% 9% 62%	2850
	11th to 20th	Night	2 1 1 2 2 2 3 3 5% 12% 67%	2850
	21st to end	Night	4 4 2 5% 4 4 4 4 6% 8% 55%	3098
August	1st to 10th	Night	1 1 1 1 1 1 2 4 7% 81%	2836
	11th to 20th	Night	2 2 1 2 2 2 2 3 6% 11% 66%	2847
	21st to end	Night	2 2 1 3 3 3 3 3 6% 10% 64%	3661
September	1st to 10th	Night	8% 4 2 5% 3 4 4 3 6% 8% 54%	2090
	11th to 20th	Night	9% 5% 2 5% 3 4 3 3 4 7% 54%	2090
	21st to end	Night	6% 3 1 3 3 3 3 3 5% 8% 62%	2090
October	1st to 10th	Night	6% 3 1 3 2 2 3 3 4 7% 67%	2090
	11th to 20th	Night	10% 3 1 4 3 2 2 2 5% 5% 64%	2261
	21st to end	Night	15% 4 1 3 1 2 2 2 3 4 62%	2508
November	1st to 10th	Night	11% 5% 2 4 3 2 2 2 3 4 62%	2340
	11th to 20th	Night	6% 4 1 4 3 3 4 3 5% 6% 61%	2564
	21st to end	Night	15% 5% 2 5% 3 2 3 2 4 5% 55%	2600
December	1st to 10th	Night	16% 5% 2 5% 3 2 3 3 3 5% 53%	4250
	11th to 20th	Night	16% 7% 2 5% 3 3 3 2 3 5% 51%	4816
	21st to end	Night	14% 7% 2 4 2 2 2 2 3 4 57%	6490

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	32% 2 5% 20% 34% 8%	2938
	11th to 20th	Day	28% 2 7% 21% 32% 10%	2940
	21st to end	Day	42% 2 5% 17% 24% 10%	3147
February	1st to 10th	Day	39% 3 6% 17% 23% 13%	1900
	11th to 20th	Day	40% 2 6% 19% 22% 11%	1859
	21st to end	Day	37% 2 4 16% 24% 17%	1570
March	1st to 10th	Day	36% 4 6% 15% 27% 12%	3422
	11th to 20th	Day	44% 4 11% 19% 17% 5%	3480
	21st to end	Day	37% 4 12% 21% 18% 8%	3814
April	1st to 10th	Day	35% 4 10% 19% 20% 12%	2090
	11th to 20th	Day	38% 3 8% 20% 21% 10%	2109
	21st to end	Day	35% 4 8% 21% 26% 7%	2470
May	1st to 10th	Day	44% 5% 9% 20% 17% 5%	4120
	11th to 20th	Day	38% 4 9% 22% 25% 2	4086
	21st to end	Day	41% 6% 14% 23% 11% 5%	4489
June	1st to 10th	Day	27% 6% 13% 31% 19% 5%	2470
	11th to 20th	Day	25% 5% 12% 31% 21% 7%	2470
	21st to end	Day	26% 5% 11% 26% 26% 6%	2470
July	1st to 10th	Day	28% 5% 15% 38% 12% 1	4056
	11th to 20th	Day	17% 4 12% 40% 22% 4	4051
	21st to end	Day	31% 7% 14% 30% 17% 1	4325
August	1st to 10th	Day	12% 3 10% 31% 39% 5%	4090
	11th to 20th	Day	18% 4 14% 38% 24% 2	4026
	21st to end	Day	20% 7% 18% 34% 19% 2	3997
September	1st to 10th	Day	32% 4 9% 21% 23% 11%	2090
	11th to 20th	Day	36% 5% 10% 20% 21% 8%	2090
	21st to end	Day	24% 3 9% 23% 27% 14%	2090
October	1st to 10th	Day	13% 2 6% 14% 32% 32%	3480
	11th to 20th	Day	16% 2 5% 20% 35% 21%	3140
	21st to end	Day	22% 3 4 24% 36% 12%	3428
November	1st to 10th	Day	33% 3 7% 21% 24% 12%	1958
	11th to 20th	Day	26% 3 9% 21% 27% 15%	1834
	21st to end	Day	37% 2 4 20% 24% 13%	1800
December	1st to 10th	Day	39% 2 6% 24% 25% 6%	2940
	11th to 20th	Day	42% 3 5% 12% 26% 12%	3389
	21st to end	Day	36% 2 4 22% 25% 11%	4488
January	1st to 10th	Night	29% 3 4 18% 34% 13%	4238
	11th to 20th	Night	25% 2 5% 19% 31% 17%	4250
	21st to end	Night	41% 2 4 15% 24% 12%	4546
February	1st to 10th	Night	37% 2 7% 15% 22% 16%	2295
	11th to 20th	Night	36% 2 6% 17% 27% 12%	2218
	21st to end	Night	35% 3 6% 15% 21% 19%	1884
March	1st to 10th	Night	40% 4 5% 14% 23% 13%	3431
	11th to 20th	Night	38% 3 12% 22% 17% 8%	3480
	21st to end	Night	35% 4 9% 21% 25% 7%	3817
April	1st to 10th	Night	29% 4 9% 23% 19% 16%	2090
	11th to 20th	Night	33% 4 11% 18% 20% 15%	2016
	21st to end	Night	30% 4 9% 20% 29% 7%	1710
May	1st to 10th	Night	44% 4 8% 22% 13% 8%	2850
	11th to 20th	Night	34% 4 14% 20% 24% 3	2824
	21st to end	Night	32% 5% 14% 30% 13% 6%	3099
June	1st to 10th	Night	21% 5% 14% 35% 19% 6%	1710
	11th to 20th	Night	17% 4 15% 33% 24% 7%	1710
	21st to end	Night	21% 7% 11% 28% 27% 7%	1710
July	1st to 10th	Night	20% 4 14% 48% 13% 2	2805
	11th to 20th	Night	12% 4 12% 45% 23% 4	2796
	21st to end	Night	25% 5% 15% 37% 17% 1	2999
August	1st to 10th	Night	6% 2 9% 37% 41% 6%	2826
	11th to 20th	Night	15% 3 16% 39% 24% 3	2874
	21st to end	Night	16% 6% 20% 36% 20% 3	3661
September	1st to 10th	Night	28% 4 11% 23% 23% 12%	2090
	11th to 20th	Night	32% 4 12% 19% 22% 11%	2090
	21st to end	Night	22% 2 7% 25% 26% 17%	2090
October	1st to 10th	Night	12% 2 6% 15% 27% 38%	3480
	11th to 20th	Night	16% 2 5% 20% 31% 27%	3747
	21st to end	Night	23% 2 3 20% 37% 16%	4120
November	1st to 10th	Night	29% 2 7% 20% 27% 16%	2340
	11th to 20th	Night	25% 3 7% 21% 27% 17%	2564
	21st to end	Night	34% 2 6% 18% 27% 13%	2600
December	1st to 10th	Night	36% 2 5% 21% 25% 11%	4250
	11th to 20th	Night	38% 2 6% 12% 28% 14%	4817
	21st to end	Night	34% 2 5% 19% 26% 15%	6490

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	22% 10% 38% 23% 7%	300
	11th to 20th	Day	19% 15% 33% 26% 6% 2	300
	21st to end	Day	21% 12% 36% 23% 7% 1	300
February	1st to 10th	Day	20% 17% 37% 20% 6%	270
	11th to 20th	Day	25% 16% 37% 18% 3	270
	21st to end	Day	26% 14% 36% 19% 4	225
March	1st to 10th	Day	21% 19% 35% 20% 4 1	270
	11th to 20th	Day	21% 16% 37% 18% 6% 1	270
	21st to end	Day	15% 14% 45% 18% 6% 1	297
April	1st to 10th	Day	19% 15% 40% 21% 5% 1	270
	11th to 20th	Day	19% 14% 36% 25% 7%	307
	21st to end	Day	18% 12% 40% 20% 9% 1	650
May	1st to 10th	Day	14% 10% 39% 31% 6% 1	653
	11th to 20th	Day	16% 5% 29% 33% 13% 3	675
	21st to end	Day	15% 5% 31% 30% 16% 3	734
June	1st to 10th	Day	7% 2 17% 38% 28% 8%	680
	11th to 20th	Day	5% 3 21% 43% 25% 4	680
	21st to end	Day	4 1 12% 38% 36% 9%	680
July	1st to 10th	Day	6% 1 8% 35% 37% 13%	671
	11th to 20th	Day	1 7% 32% 45% 14%	668
	21st to end	Day	4 2 5% 31% 45% 14%	739
August	1st to 10th	Day	2 1 5% 33% 45% 14%	676
	11th to 20th	Day	9% 1 4 31% 43% 12%	637
	21st to end	Day	6% 1 6% 29% 36% 22%	435
September	1st to 10th	Day	8% 2 5% 24% 40% 21%	300
	11th to 20th	Day	4 1 4 29% 46% 16%	300
	21st to end	Day	9% 2 7% 33% 33% 16%	300
October	1st to 10th	Day	4 2 18% 33% 32% 11%	300
	11th to 20th	Day	8% 6% 29% 34% 19% 4	300
	21st to end	Day	23% 8% 24% 26% 16% 3	330
November	1st to 10th	Day	21% 6% 30% 29% 11% 3	300
	11th to 20th	Day	12% 9% 29% 31% 16% 4	300
	21st to end	Day	19% 12% 36% 21% 11% 1	300
December	1st to 10th	Day	16% 7% 34% 29% 11% 3	300
	11th to 20th	Day	21% 9% 34% 25% 10% 1	300
	21st to end	Day	19% 10% 36% 25% 8% 1	330
January	1st to 10th	Night	15% 9% 36% 33% 7%	1000
	11th to 20th	Night	18% 13% 30% 34% 6%	1000
	21st to end	Night	18% 11% 33% 32% 7%	1051
February	1st to 10th	Night	20% 11% 36% 28% 5%	775
	11th to 20th	Night	19% 12% 38% 29% 3	744
	21st to end	Night	24% 12% 42% 21% 2	628
March	1st to 10th	Night	17% 12% 38% 27% 5%	582
	11th to 20th	Night	17% 9% 40% 29% 5%	570
	21st to end	Night	13% 12% 42% 29% 4	627
April	1st to 10th	Night	12% 12% 45% 26% 5%	570
	11th to 20th	Night	15% 12% 42% 27% 5%	563
	21st to end	Night	12% 11% 45% 25% 8%	570
May	1st to 10th	Night	13% 10% 41% 30% 5%	570
	11th to 20th	Night	12% 5% 38% 32% 11% 1	561
	21st to end	Night	11% 3 34% 37% 13% 2	617
June	1st to 10th	Night	5% 1 24% 45% 22% 3	570
	11th to 20th	Night	4 1 28% 51% 14% 1	570
	21st to end	Night	4 1 20% 44% 29% 3	570
July	1st to 10th	Night	6% 1 11% 46% 32% 3	555
	11th to 20th	Night	3 12% 49% 33% 3	552
	21st to end	Night	2 1 7% 50% 37% 3	624
August	1st to 10th	Night	1 7% 50% 40% 3	567
	11th to 20th	Night	5% 1 7% 46% 35% 5%	564
	21st to end	Night	5% 1 5% 41% 42% 6%	627
September	1st to 10th	Night	9% 2 8% 42% 35% 3	570
	11th to 20th	Night	12% 2 8% 40% 36% 2	570
	21st to end	Night	7% 1 13% 42% 34% 3	570
October	1st to 10th	Night	6% 1 19% 45% 25% 3	570
	11th to 20th	Night	10% 4 27% 40% 17% 2	741
	21st to end	Night	17% 5% 29% 32% 15% 1	836
November	1st to 10th	Night	12% 4 29% 38% 16% 1	780
	11th to 20th	Night	8% 7% 35% 37% 12% 1	964
	21st to end	Night	18% 9% 34% 28% 11% 1	1000
December	1st to 10th	Night	16% 7% 33% 36% 8% 1	1000
	11th to 20th	Night	21% 7% 32% 33% 6%	1000
	21st to end	Night	18% 9% 33% 32% 8%	1100

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