Battleship Texas State Historic Site
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Battleship Texas State Historic Site clear sky chart from 2005-11-06 to 2024-11-05.

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%	100994
	Night	14% 6% 2 5% 4 4 4 3 5% 8% 45%	98099
Transparency	Day	38% 9% 13% 19% 15% 6%	104668
	Night	36% 7% 13% 20% 16% 8%	102539
Seeing	Day	12% 6% 18% 27% 25% 13%	14827
	Night	14% 5% 19% 32% 26% 4	24655

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% 10% 2 6% 4 3 3 3 4 5% 41%	2847
	11th to 20th	Day	15% 7% 2 4 3 3 2 2 3 6% 53%	2850
	21st to end	Day	24% 8% 2 7% 4 3 3 3 5% 8% 33%	3135
February	1st to 10th	Day	23% 8% 3 7% 4 4 4 3 4 6% 34%	1776
	11th to 20th	Day	23% 9% 3 5% 4 3 4 3 4 6% 36%	1896
	21st to end	Day	20% 8% 2 7% 4 4 4 3 4 5% 39%	1727
March	1st to 10th	Day	20% 9% 3 9% 5% 5% 5% 4 5% 7% 29%	3436
	11th to 20th	Day	19% 7% 3 9% 5% 6% 5% 4 6% 6% 29%	3480
	21st to end	Day	18% 6% 2 6% 4 4 4 3 5% 6% 41%	3814
April	1st to 10th	Day	16% 7% 3 8% 5% 4 4 4 6% 5% 38%	2090
	11th to 20th	Day	17% 8% 2 7% 5% 4 4 3 5% 6% 38%	2230
	21st to end	Day	10% 7% 2 7% 5% 4 5% 5% 6% 7% 43%	2280
May	1st to 10th	Day	18% 8% 3 9% 6% 5% 5% 4 6% 6% 30%	3765
	11th to 20th	Day	13% 6% 3 7% 4 4 4 4 5% 7% 42%	4078
	21st to end	Day	8% 6% 2 6% 6% 5% 6% 5% 8% 11% 36%	4477
June	1st to 10th	Day	6% 5% 2 7% 5% 4 6% 5% 9% 9% 42%	2470
	11th to 20th	Day	6% 4 2 6% 6% 6% 7% 6% 9% 10% 39%	2470
	21st to end	Day	6% 6% 3 7% 7% 8% 9% 6% 8% 10% 30%	2470
July	1st to 10th	Day	8% 5% 2 7% 6% 7% 6% 6% 9% 13% 30%	4120
	11th to 20th	Day	6% 7% 3 11% 8% 8% 8% 6% 9% 10% 24%	4120
	21st to end	Day	14% 8% 3 8% 6% 7% 6% 5% 8% 10% 27%	4465
August	1st to 10th	Day	2 2 1 3 3 4 5% 5% 7% 11% 57%	4104
	11th to 20th	Day	3 2 1 5% 4 5% 6% 5% 9% 13% 48%	3829
	21st to end	Day	8% 4 2 6% 6% 6% 7% 6% 9% 9% 36%	4164
September	1st to 10th	Day	8% 6% 2 7% 6% 6% 7% 6% 8% 10% 34%	2090
	11th to 20th	Day	14% 6% 3 7% 5% 6% 5% 5% 7% 7% 36%	2090
	21st to end	Day	10% 5% 2 5% 4 4 4 4 6% 8% 49%	2090
October	1st to 10th	Day	8% 4 2 4 4 2 4 4 6% 8% 55%	1956
	11th to 20th	Day	10% 4 2 5% 4 4 3 3 5% 6% 53%	1900
	21st to end	Day	13% 5% 2 5% 3 3 4 3 3 6% 54%	2090
November	1st to 10th	Day	11% 5% 2 5% 5% 6% 4 4 6% 7% 47%	1898
	11th to 20th	Day	11% 6% 3 7% 4 5% 4 4 6% 5% 46%	1900
	21st to end	Day	17% 7% 2 7% 4 4 4 3 5% 6% 41%	1881
December	1st to 10th	Day	16% 9% 2 6% 4 5% 3 3 5% 7% 40%	1710
	11th to 20th	Day	14% 7% 3 7% 5% 4 4 4 5% 6% 40%	2161
	21st to end	Day	17% 6% 2 5% 4 4 4 3 5% 6% 44%	3135
January	1st to 10th	Night	20% 8% 2 6% 4 3 4 3 5% 6% 40%	4108
	11th to 20th	Night	19% 7% 2 4 3 3 2 2 3 5% 50%	4120
	21st to end	Night	25% 9% 3 6% 3 3 3 2 5% 7% 35%	4532
February	1st to 10th	Night	20% 9% 3 6% 4 3 4 2 4 6% 38%	2418
	11th to 20th	Night	21% 10% 3 5% 3 2 3 2 4 5% 42%	2169
	21st to end	Night	23% 8% 2 6% 4 3 2 3 4 5% 39%	1727
March	1st to 10th	Night	27% 12% 3 6% 3 3 3 4 5% 6% 29%	3419
	11th to 20th	Night	24% 9% 4 8% 5% 4 4 3 5% 6% 30%	3480
	21st to end	Night	14% 6% 2 7% 4 5% 4 3 4 5% 45%	3817
April	1st to 10th	Night	16% 6% 2 7% 5% 4 4 4 6% 7% 39%	2090
	11th to 20th	Night	20% 6% 2 4 4 3 3 3 5% 6% 43%	1897
	21st to end	Night	14% 7% 2 6% 4 4 4 4 6% 7% 43%	1900
May	1st to 10th	Night	27% 9% 2 6% 5% 4 4 3 5% 7% 28%	3116
	11th to 20th	Night	13% 7% 3 7% 4 4 5% 4 5% 6% 42%	2823
	21st to end	Night	15% 7% 3 6% 4 4 5% 4 8% 11% 33%	3090
June	1st to 10th	Night	5% 3 1 4 3 3 4 3 6% 11% 57%	1710
	11th to 20th	Night	6% 3 1 3 3 3 3 4 7% 12% 54%	1710
	21st to end	Night	6% 5% 2 5% 5% 4 5% 5% 9% 12% 44%	1710
July	1st to 10th	Night	6% 5% 2 4 4 4 5% 5% 7% 12% 47%	2850
	11th to 20th	Night	4 4 2 6% 5% 6% 6% 5% 7% 12% 43%	2850
	21st to end	Night	9% 7% 3 8% 5% 5% 5% 4 7% 9% 38%	3098
August	1st to 10th	Night	1 1 1 2 2 2 3 3 5% 10% 70%	2836
	11th to 20th	Night	2 2 1 3 2 3 3 4 7% 14% 59%	3002
	21st to end	Night	5% 3 1 4 4 5% 5% 5% 9% 12% 47%	3476
September	1st to 10th	Night	6% 5% 3 5% 5% 4 4 4 7% 11% 46%	2087
	11th to 20th	Night	12% 6% 2 6% 3 4 4 3 5% 9% 45%	2090
	21st to end	Night	9% 4 2 4 4 3 3 4 6% 7% 54%	2090
October	1st to 10th	Night	5% 4 2 4 4 3 3 3 5% 6% 61%	2204
	11th to 20th	Night	10% 3 2 3 3 3 3 2 5% 7% 60%	2280
	21st to end	Night	11% 5% 2 4 3 3 3 3 4 5% 60%	2508
November	1st to 10th	Night	10% 5% 1 4 3 4 3 3 5% 7% 54%	2280
	11th to 20th	Night	12% 5% 2 5% 4 4 4 3 5% 6% 51%	2280
	21st to end	Night	16% 6% 2 6% 4 3 4 3 4 5% 46%	2294
December	1st to 10th	Night	17% 8% 3 6% 4 3 3 3 4 6% 42%	2470
	11th to 20th	Night	16% 8% 3 6% 4 4 4 3 4 6% 42%	3036
	21st to end	Night	16% 7% 2 6% 3 4 4 3 4 6% 44%	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	46% 4 5% 16% 19% 9%	2848
	11th to 20th	Day	34% 5% 6% 24% 21% 10%	2850
	21st to end	Day	49% 4 4 16% 16% 10%	3135
February	1st to 10th	Day	51% 6% 6% 13% 15% 10%	1776
	11th to 20th	Day	50% 6% 6% 13% 17% 9%	1906
	21st to end	Day	48% 6% 8% 14% 14% 10%	1727
March	1st to 10th	Day	51% 10% 12% 12% 12% 4	3436
	11th to 20th	Day	51% 10% 9% 13% 13% 5%	3480
	21st to end	Day	41% 7% 9% 18% 21% 4	3814
April	1st to 10th	Day	45% 8% 8% 16% 14% 9%	2090
	11th to 20th	Day	45% 6% 9% 15% 16% 9%	2230
	21st to end	Day	37% 8% 11% 18% 20% 6%	2280
May	1st to 10th	Day	50% 10% 11% 16% 10% 4	3800
	11th to 20th	Day	39% 9% 9% 19% 21% 3	4082
	21st to end	Day	36% 12% 15% 28% 9%	4489
June	1st to 10th	Day	32% 12% 16% 24% 15% 1	2470
	11th to 20th	Day	33% 11% 17% 25% 13% 2	2470
	21st to end	Day	41% 14% 17% 21% 7%	2470
July	1st to 10th	Day	37% 14% 27% 19% 3	4056
	11th to 20th	Day	47% 14% 20% 15% 5%	4051
	21st to end	Day	48% 12% 18% 19% 2	4325
August	1st to 10th	Day	17% 9% 17% 40% 17%	4090
	11th to 20th	Day	22% 12% 33% 29% 4 1	3867
	21st to end	Day	37% 15% 16% 18% 13% 1	4163
September	1st to 10th	Day	38% 15% 15% 16% 13% 4	2090
	11th to 20th	Day	43% 11% 12% 16% 15% 3	2090
	21st to end	Day	32% 8% 14% 19% 16% 11%	2090
October	1st to 10th	Day	19% 5% 7% 15% 15% 39%	3242
	11th to 20th	Day	21% 5% 6% 18% 36% 14%	3140
	21st to end	Day	25% 6% 6% 17% 34% 13%	3428
November	1st to 10th	Day	35% 7% 11% 19% 20% 9%	1898
	11th to 20th	Day	37% 6% 10% 14% 20% 12%	1900
	21st to end	Day	43% 6% 8% 15% 17% 11%	1881
December	1st to 10th	Day	43% 6% 10% 18% 16% 7%	1710
	11th to 20th	Day	42% 7% 9% 13% 20% 9%	2159
	21st to end	Day	40% 6% 7% 15% 20% 11%	3135
January	1st to 10th	Night	43% 6% 7% 16% 16% 12%	4108
	11th to 20th	Night	38% 5% 6% 16% 26% 10%	4120
	21st to end	Night	49% 4 5% 16% 17% 9%	4532
February	1st to 10th	Night	47% 4 9% 11% 16% 13%	2418
	11th to 20th	Night	45% 5% 7% 13% 18% 12%	2169
	21st to end	Night	48% 5% 6% 14% 16% 11%	1727
March	1st to 10th	Night	54% 7% 10% 13% 11% 5%	3419
	11th to 20th	Night	54% 8% 9% 13% 12% 4	3480
	21st to end	Night	38% 8% 10% 15% 22% 7%	3817
April	1st to 10th	Night	43% 7% 10% 16% 14% 9%	2090
	11th to 20th	Night	41% 5% 10% 16% 15% 13%	1897
	21st to end	Night	39% 8% 8% 21% 17% 7%	1900
May	1st to 10th	Night	53% 9% 11% 14% 9% 5%	3146
	11th to 20th	Night	39% 9% 9% 18% 19% 5%	2824
	21st to end	Night	38% 13% 18% 23% 6% 1	3099
June	1st to 10th	Night	21% 8% 23% 31% 17%	1710
	11th to 20th	Night	23% 7% 19% 31% 18% 3	1710
	21st to end	Night	30% 11% 22% 27% 10%	1710
July	1st to 10th	Night	29% 10% 34% 24% 3	2805
	11th to 20th	Night	31% 13% 27% 24% 5%	2796
	21st to end	Night	40% 12% 24% 21% 3	2999
August	1st to 10th	Night	10% 7% 20% 48% 14%	2826
	11th to 20th	Night	14% 9% 37% 35% 4	3030
	21st to end	Night	28% 15% 21% 26% 9% 1	3476
September	1st to 10th	Night	30% 11% 23% 19% 13% 3	2087
	11th to 20th	Night	36% 9% 15% 20% 16% 4	2090
	21st to end	Night	28% 8% 14% 22% 18% 10%	2090
October	1st to 10th	Night	17% 5% 9% 17% 16% 36%	3672
	11th to 20th	Night	15% 5% 6% 22% 33% 18%	3779
	21st to end	Night	20% 4 6% 15% 38% 16%	4120
November	1st to 10th	Night	30% 6% 11% 22% 20% 10%	2280
	11th to 20th	Night	34% 5% 11% 20% 20% 11%	2280
	21st to end	Night	41% 5% 8% 19% 18% 9%	2294
December	1st to 10th	Night	43% 5% 10% 19% 14% 9%	2470
	11th to 20th	Night	43% 5% 8% 11% 18% 14%	3037
	21st to end	Night	41% 6% 7% 13% 25% 7%	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	24% 8% 35% 24% 9% 1	270
	11th to 20th	Day	20% 13% 29% 29% 7% 2	270
	21st to end	Day	17% 15% 31% 27% 10%	297
February	1st to 10th	Day	22% 13% 35% 23% 7%	270
	11th to 20th	Day	26% 17% 29% 21% 7% 1	270
	21st to end	Day	20% 16% 42% 19% 2	225
March	1st to 10th	Day	27% 12% 32% 23% 6%	270
	11th to 20th	Day	17% 14% 44% 19% 4 2	270
	21st to end	Day	19% 16% 31% 24% 9% 1	297
April	1st to 10th	Day	18% 15% 34% 24% 9%	270
	11th to 20th	Day	21% 12% 29% 23% 13% 2	428
	21st to end	Day	14% 7% 30% 30% 17% 2	460
May	1st to 10th	Day	13% 9% 29% 31% 17% 1	463
	11th to 20th	Day	12% 4 27% 33% 21% 3	671
	21st to end	Day	9% 4 23% 38% 22% 4	734
June	1st to 10th	Day	7% 2 11% 34% 33% 13%	680
	11th to 20th	Day	7% 3 11% 36% 30% 14%	680
	21st to end	Day	8% 2 9% 29% 33% 19%	680
July	1st to 10th	Day	7% 2 6% 24% 38% 23%	671
	11th to 20th	Day	5% 1 4 21% 40% 29%	668
	21st to end	Day	5% 2 5% 22% 40% 26%	739
August	1st to 10th	Day	3 3 20% 43% 31%	676
	11th to 20th	Day	3 1 2 14% 43% 37%	543
	21st to end	Day	10% 2 5% 16% 34% 33%	536
September	1st to 10th	Day	8% 3 8% 21% 34% 27%	300
	11th to 20th	Day	10% 2 7% 22% 36% 23%	300
	21st to end	Day	10% 1 5% 29% 36% 19%	300
October	1st to 10th	Day	7% 1 9% 36% 35% 12%	300
	11th to 20th	Day	8% 4 13% 37% 26% 11%	300
	21st to end	Day	17% 7% 22% 28% 20% 6%	330
November	1st to 10th	Day	13% 5% 19% 32% 24% 6%	282
	11th to 20th	Day	16% 5% 20% 39% 16% 4	270
	21st to end	Day	15% 16% 30% 23% 14% 2	270
December	1st to 10th	Day	18% 7% 28% 26% 15% 6%	270
	11th to 20th	Day	16% 12% 31% 30% 10% 1	270
	21st to end	Day	20% 9% 34% 26% 10% 2	297
January	1st to 10th	Night	22% 8% 29% 32% 9%	950
	11th to 20th	Night	21% 8% 27% 35% 8% 1	950
	21st to end	Night	22% 8% 27% 36% 8%	1045
February	1st to 10th	Night	25% 8% 30% 33% 5%	898
	11th to 20th	Night	25% 10% 29% 30% 7%	695
	21st to end	Night	25% 11% 33% 26% 4	471
March	1st to 10th	Night	24% 6% 30% 32% 7%	570
	11th to 20th	Night	19% 9% 27% 35% 9% 1	570
	21st to end	Night	16% 7% 30% 36% 11% 1	627
April	1st to 10th	Night	16% 8% 31% 37% 8%	570
	11th to 20th	Night	22% 8% 24% 35% 11%	563
	21st to end	Night	17% 7% 24% 38% 14% 1	570
May	1st to 10th	Night	15% 7% 24% 43% 10%	570
	11th to 20th	Night	12% 3 21% 43% 20% 2	561
	21st to end	Night	6% 4 19% 40% 29% 2	617
June	1st to 10th	Night	5% 1 6% 43% 41% 4	570
	11th to 20th	Night	6% 1 6% 39% 43% 4	570
	21st to end	Night	6% 1 9% 24% 51% 8%	570
July	1st to 10th	Night	5% 2 3 26% 53% 11%	555
	11th to 20th	Night	4 1 1 20% 60% 13%	552
	21st to end	Night	4 3 21% 61% 10%	624
August	1st to 10th	Night	2 1 2 16% 68% 12%	567
	11th to 20th	Night	5% 1 2 15% 67% 12%	564
	21st to end	Night	6% 2 3 20% 55% 14%	627
September	1st to 10th	Night	7% 2 7% 20% 53% 12%	570
	11th to 20th	Night	14% 1 4 23% 50% 8%	570
	21st to end	Night	10% 1 6% 29% 46% 7%	570
October	1st to 10th	Night	6% 1 10% 35% 42% 7%	684
	11th to 20th	Night	9% 2 16% 40% 30% 3	760
	21st to end	Night	12% 5% 19% 36% 25% 3	836
November	1st to 10th	Night	12% 2 16% 41% 26% 3	760
	11th to 20th	Night	13% 6% 20% 41% 20% 1	760
	21st to end	Night	18% 6% 27% 33% 16% 1	774
December	1st to 10th	Night	19% 7% 25% 32% 17% 1	950
	11th to 20th	Night	22% 8% 25% 35% 11%	950
	21st to end	Night	20% 8% 30% 33% 9%	1045

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