Lake Corpus Christi State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lake Corpus Christi State Park clear sky chart from 2005-11-06 to 2024-11-02.

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	11% 6% 2 6% 4 5% 5% 4 6% 8% 44%	100927
	Night	13% 6% 2 5% 3 3 3 3 5% 7% 49%	98161
Transparency	Day	36% 8% 13% 21% 15% 7%	100738
	Night	34% 7% 14% 22% 15% 8%	98021
Seeing	Day	11% 5% 20% 31% 24% 8%	14564
	Night	14% 4 23% 37% 19% 2	24489

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	17% 7% 3 5% 4 4 3 3 4 5% 47%	2847
	11th to 20th	Day	15% 5% 2 5% 3 2 2 3 4 5% 53%	2850
	21st to end	Day	23% 7% 2 5% 3 3 4 3 6% 7% 36%	3459
February	1st to 10th	Day	19% 8% 3 6% 5% 4 3 3 5% 5% 40%	1900
	11th to 20th	Day	18% 7% 3 5% 4 4 3 4 3 6% 44%	1849
	21st to end	Day	17% 8% 2 5% 4 4 3 3 4 5% 45%	1586
March	1st to 10th	Day	16% 8% 3 9% 5% 4 4 4 5% 7% 34%	3436
	11th to 20th	Day	23% 10% 4 9% 5% 5% 4 3 5% 5% 28%	3480
	21st to end	Day	9% 5% 1 4 4 4 4 4 6% 8% 52%	3814
April	1st to 10th	Day	12% 6% 3 6% 4 4 4 3 6% 7% 44%	2090
	11th to 20th	Day	19% 5% 2 6% 5% 4 4 3 4 6% 41%	2066
	21st to end	Day	13% 7% 2 5% 5% 5% 4 3 5% 8% 43%	2285
May	1st to 10th	Day	14% 6% 3 7% 5% 5% 5% 4 6% 9% 36%	4082
	11th to 20th	Day	9% 6% 3 7% 5% 5% 5% 4 6% 7% 44%	4082
	21st to end	Day	6% 4 2 5% 5% 5% 6% 4 7% 9% 48%	4477
June	1st to 10th	Day	5% 3 2 4 4 4 5% 4 7% 10% 51%	2470
	11th to 20th	Day	5% 4 2 5% 4 6% 6% 5% 7% 9% 47%	2470
	21st to end	Day	6% 5% 2 6% 6% 6% 6% 5% 9% 10% 38%	2470
July	1st to 10th	Day	6% 5% 2 6% 5% 6% 6% 5% 7% 9% 43%	4120
	11th to 20th	Day	5% 6% 3 9% 7% 7% 7% 5% 8% 9% 34%	4120
	21st to end	Day	8% 6% 2 6% 6% 6% 5% 5% 7% 10% 38%	4465
August	1st to 10th	Day	1 1 1 2 3 2 4 3 6% 9% 68%	3983
	11th to 20th	Day	2 2 1 4 3 4 6% 6% 10% 12% 50%	3726
	21st to end	Day	4 5% 2 7% 5% 6% 7% 6% 8% 12% 38%	3906
September	1st to 10th	Day	10% 6% 3 7% 6% 8% 7% 5% 6% 9% 34%	2090
	11th to 20th	Day	10% 6% 2 8% 5% 5% 7% 5% 6% 9% 37%	2090
	21st to end	Day	7% 4 2 7% 4 5% 5% 4 7% 10% 45%	2090
October	1st to 10th	Day	6% 4 2 5% 4 5% 5% 3 6% 8% 52%	2090
	11th to 20th	Day	11% 4 2 5% 3 4 4 3 5% 8% 50%	1971
	21st to end	Day	10% 4 2 4 3 3 4 3 4 5% 57%	2090
November	1st to 10th	Day	11% 6% 3 7% 6% 4 3 4 5% 7% 45%	1868
	11th to 20th	Day	13% 6% 2 6% 4 4 4 4 5% 6% 46%	1889
	21st to end	Day	16% 7% 3 7% 5% 4 4 4 4 6% 41%	1710
December	1st to 10th	Day	19% 7% 2 5% 4 4 3 3 4 7% 42%	1710
	11th to 20th	Day	16% 9% 2 7% 4 3 4 3 5% 6% 40%	2161
	21st to end	Day	15% 6% 2 6% 4 4 4 3 4 7% 45%	3135
January	1st to 10th	Night	19% 8% 2 5% 3 3 3 3 4 5% 46%	4108
	11th to 20th	Night	15% 5% 2 4 3 2 2 2 4 6% 55%	4120
	21st to end	Night	24% 6% 3 7% 4 3 3 3 6% 6% 36%	4235
February	1st to 10th	Night	18% 8% 2 5% 4 4 3 3 5% 5% 42%	2280
	11th to 20th	Night	20% 7% 2 4 2 2 3 2 5% 7% 45%	2218
	21st to end	Night	18% 8% 2 5% 3 3 3 3 4 5% 46%	1865
March	1st to 10th	Night	25% 8% 2 6% 3 4 4 4 5% 7% 34%	3419
	11th to 20th	Night	27% 9% 3 9% 5% 5% 4 3 4 5% 28%	3480
	21st to end	Night	16% 5% 2 4 3 3 2 3 4 5% 54%	3817
April	1st to 10th	Night	13% 6% 3 6% 4 5% 5% 4 6% 7% 40%	2090
	11th to 20th	Night	18% 7% 3 5% 5% 3 3 3 5% 6% 43%	2063
	21st to end	Night	17% 8% 3 6% 4 4 3 4 5% 5% 41%	1890
May	1st to 10th	Night	22% 8% 2 7% 4 4 4 3 5% 7% 35%	2823
	11th to 20th	Night	16% 8% 2 5% 3 4 4 3 5% 7% 42%	2823
	21st to end	Night	10% 5% 2 7% 4 4 4 4 7% 9% 43%	3090
June	1st to 10th	Night	5% 3 1 3 3 3 3 4 7% 9% 59%	1710
	11th to 20th	Night	4 4 1 4 4 4 4 4 6% 10% 58%	1710
	21st to end	Night	5% 3 1 5% 3 5% 5% 4 7% 12% 50%	1710
July	1st to 10th	Night	4 4 2 3 3 3 4 3 7% 11% 55%	2850
	11th to 20th	Night	4 4 2 6% 5% 5% 6% 5% 8% 12% 43%	2850
	21st to end	Night	8% 4 2 6% 4 4 5% 5% 7% 10% 46%	3098
August	1st to 10th	Night	1 1 1 2 2 3 6% 82%	2952
	11th to 20th	Night	2 3 1 3 3 3 3 3 7% 13% 58%	3113
	21st to end	Night	3 2 1 3 3 3 4 3 7% 12% 60%	3752
September	1st to 10th	Night	7% 6% 3 7% 4 3 4 4 6% 9% 48%	2090
	11th to 20th	Night	8% 6% 2 6% 4 4 4 4 6% 8% 48%	2090
	21st to end	Night	7% 3 1 5% 3 3 3 3 5% 8% 57%	2090
October	1st to 10th	Night	4 3 1 3 3 2 2 4 5% 7% 64%	2090
	11th to 20th	Night	11% 4 1 4 3 3 3 2 4 6% 60%	2188
	21st to end	Night	10% 4 2 4 2 2 2 2 3 4 66%	2508
November	1st to 10th	Night	10% 5% 2 4 4 4 4 3 6% 6% 53%	2244
	11th to 20th	Night	14% 5% 2 6% 3 3 3 2 4 6% 52%	2287
	21st to end	Night	16% 6% 2 6% 4 4 3 4 4 7% 45%	2470
December	1st to 10th	Night	19% 7% 2 4 3 3 3 4 4 5% 46%	2470
	11th to 20th	Night	18% 9% 3 5% 4 3 3 3 5% 6% 40%	3036
	21st to end	Night	14% 8% 2 6% 3 4 4 3 4 7% 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	40% 6% 5% 13% 22% 15%	2848
	11th to 20th	Day	33% 5% 8% 18% 22% 14%	2850
	21st to end	Day	46% 5% 6% 15% 20% 8%	3459
February	1st to 10th	Day	47% 5% 7% 10% 18% 13%	1900
	11th to 20th	Day	42% 5% 9% 16% 17% 11%	1859
	21st to end	Day	42% 5% 7% 17% 18% 11%	1586
March	1st to 10th	Day	47% 8% 10% 17% 12% 6%	3436
	11th to 20th	Day	56% 8% 7% 9% 13% 7%	3480
	21st to end	Day	29% 7% 12% 21% 16% 14%	3814
April	1st to 10th	Day	38% 8% 11% 16% 16% 11%	2090
	11th to 20th	Day	43% 7% 9% 18% 13% 11%	2066
	21st to end	Day	38% 8% 9% 20% 15% 11%	2285
May	1st to 10th	Day	41% 11% 15% 18% 10% 6%	4120
	11th to 20th	Day	36% 10% 11% 18% 17% 8%	4086
	21st to end	Day	27% 10% 13% 38% 12% 1	4489
June	1st to 10th	Day	26% 7% 16% 29% 19% 3	2470
	11th to 20th	Day	30% 8% 13% 25% 20% 3	2470
	21st to end	Day	37% 11% 16% 25% 10% 1	2470
July	1st to 10th	Day	33% 9% 20% 31% 6%	4056
	11th to 20th	Day	42% 10% 18% 20% 9%	4051
	21st to end	Day	38% 10% 21% 26% 4	4325
August	1st to 10th	Day	13% 8% 16% 44% 19%	3969
	11th to 20th	Day	21% 11% 30% 30% 8%	3762
	21st to end	Day	33% 13% 18% 26% 10% 1	3905
September	1st to 10th	Day	45% 11% 14% 14% 12% 4	2090
	11th to 20th	Day	40% 11% 15% 17% 14% 3	2090
	21st to end	Day	32% 9% 14% 19% 16% 10%	2090
October	1st to 10th	Day	29% 6% 13% 18% 24% 9%	2090
	11th to 20th	Day	32% 7% 11% 20% 16% 14%	1971
	21st to end	Day	28% 5% 8% 16% 25% 18%	2090
November	1st to 10th	Day	37% 7% 11% 17% 18% 9%	1868
	11th to 20th	Day	38% 5% 11% 15% 18% 12%	1889
	21st to end	Day	44% 5% 8% 15% 16% 11%	1710
December	1st to 10th	Day	42% 5% 8% 18% 18% 8%	1710
	11th to 20th	Day	43% 7% 8% 11% 18% 14%	2159
	21st to end	Day	39% 6% 7% 18% 20% 11%	3135
January	1st to 10th	Night	38% 6% 8% 12% 15% 21%	4108
	11th to 20th	Night	31% 4 6% 20% 21% 19%	4120
	21st to end	Night	47% 5% 7% 12% 20% 9%	4235
February	1st to 10th	Night	43% 5% 9% 12% 14% 16%	2280
	11th to 20th	Night	39% 6% 9% 16% 18% 12%	2218
	21st to end	Night	40% 5% 8% 20% 16% 10%	1865
March	1st to 10th	Night	48% 8% 10% 16% 12% 6%	3419
	11th to 20th	Night	58% 7% 9% 10% 9% 7%	3480
	21st to end	Night	31% 6% 13% 18% 21% 11%	3817
April	1st to 10th	Night	41% 8% 12% 17% 13% 9%	2090
	11th to 20th	Night	41% 7% 10% 15% 13% 13%	2063
	21st to end	Night	44% 7% 10% 16% 14% 9%	1890
May	1st to 10th	Night	46% 9% 12% 17% 10% 6%	2850
	11th to 20th	Night	39% 8% 14% 18% 16% 5%	2824
	21st to end	Night	34% 11% 15% 33% 7%	3099
June	1st to 10th	Night	18% 9% 20% 33% 18% 2	1710
	11th to 20th	Night	22% 7% 14% 34% 20% 2	1710
	21st to end	Night	25% 11% 20% 32% 10% 1	1710
July	1st to 10th	Night	22% 8% 28% 37% 4	2805
	11th to 20th	Night	31% 11% 27% 23% 8%	2796
	21st to end	Night	31% 11% 27% 26% 5%	2999
August	1st to 10th	Night	6% 5% 19% 52% 18%	2942
	11th to 20th	Night	18% 8% 37% 33% 4	3143
	21st to end	Night	17% 13% 29% 32% 9% 1	3752
September	1st to 10th	Night	33% 9% 23% 20% 11% 4	2090
	11th to 20th	Night	33% 9% 16% 26% 13% 3	2090
	21st to end	Night	24% 9% 13% 27% 18% 8%	2090
October	1st to 10th	Night	20% 6% 14% 28% 21% 11%	2090
	11th to 20th	Night	27% 5% 11% 23% 20% 13%	2188
	21st to end	Night	25% 4 7% 19% 26% 18%	2508
November	1st to 10th	Night	30% 8% 12% 20% 21% 9%	2244
	11th to 20th	Night	34% 6% 14% 17% 18% 12%	2287
	21st to end	Night	40% 5% 11% 19% 16% 10%	2470
December	1st to 10th	Night	39% 7% 10% 17% 17% 10%	2470
	11th to 20th	Night	44% 6% 7% 14% 14% 15%	3037
	21st to end	Night	38% 6% 9% 14% 19% 13%	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	20% 6% 35% 27% 10% 3	270
	11th to 20th	Day	20% 8% 28% 31% 12% 1	270
	21st to end	Day	24% 7% 36% 19% 12% 2	297
February	1st to 10th	Day	21% 15% 26% 23% 12% 3	270
	11th to 20th	Day	21% 12% 32% 25% 9%	270
	21st to end	Day	21% 12% 39% 20% 7%	225
March	1st to 10th	Day	19% 9% 36% 28% 8%	270
	11th to 20th	Day	16% 14% 39% 23% 8%	270
	21st to end	Day	12% 11% 40% 29% 6% 1	297
April	1st to 10th	Day	13% 9% 40% 29% 10%	270
	11th to 20th	Day	18% 10% 35% 24% 12% 1	264
	21st to end	Day	14% 10% 37% 29% 8% 1	465
May	1st to 10th	Day	12% 9% 41% 28% 9%	653
	11th to 20th	Day	9% 5% 36% 35% 13% 2	675
	21st to end	Day	7% 5% 30% 39% 17% 1	734
June	1st to 10th	Day	5% 2 17% 38% 32% 7%	680
	11th to 20th	Day	6% 1 14% 44% 29% 6%	680
	21st to end	Day	7% 1 11% 37% 31% 12%	680
July	1st to 10th	Day	6% 1 8% 37% 37% 12%	671
	11th to 20th	Day	4 5% 34% 44% 12%	668
	21st to end	Day	6% 1 4 36% 38% 14%	739
August	1st to 10th	Day	1 4 37% 39% 18%	607
	11th to 20th	Day	3 1 7% 37% 35% 17%	477
	21st to end	Day	7% 1 5% 24% 33% 31%	382
September	1st to 10th	Day	10% 1 6% 21% 39% 23%	300
	11th to 20th	Day	7% 1 4 17% 45% 26%	300
	21st to end	Day	6% 2 6% 20% 40% 27%	300
October	1st to 10th	Day	7% 3 7% 27% 42% 15%	300
	11th to 20th	Day	12% 1 11% 29% 30% 17%	300
	21st to end	Day	12% 8% 19% 32% 21% 8%	330
November	1st to 10th	Day	14% 5% 15% 27% 31% 8%	273
	11th to 20th	Day	20% 4 17% 29% 28% 3	270
	21st to end	Day	21% 10% 28% 23% 13% 4	270
December	1st to 10th	Day	17% 5% 21% 31% 19% 7%	270
	11th to 20th	Day	20% 12% 29% 23% 14% 3	270
	21st to end	Day	17% 7% 29% 34% 10% 2	297
January	1st to 10th	Night	23% 7% 25% 35% 10% 1	950
	11th to 20th	Night	21% 6% 30% 35% 8%	950
	21st to end	Night	22% 7% 27% 36% 8%	865
February	1st to 10th	Night	23% 9% 31% 33% 5%	760
	11th to 20th	Night	25% 7% 31% 32% 6%	744
	21st to end	Night	24% 8% 39% 26% 3	609
March	1st to 10th	Night	23% 8% 34% 30% 5%	570
	11th to 20th	Night	20% 9% 35% 32% 4	570
	21st to end	Night	15% 8% 40% 32% 4	627
April	1st to 10th	Night	15% 6% 42% 32% 4	570
	11th to 20th	Night	20% 7% 37% 30% 6%	563
	21st to end	Night	19% 8% 40% 27% 6%	570
May	1st to 10th	Night	15% 7% 43% 33% 3	570
	11th to 20th	Night	13% 4 34% 39% 9% 1	561
	21st to end	Night	10% 3 32% 42% 14%	617
June	1st to 10th	Night	6% 1 16% 51% 24% 1	570
	11th to 20th	Night	5% 1 18% 57% 18% 1	570
	21st to end	Night	5% 1 14% 46% 30% 4	570
July	1st to 10th	Night	5% 1 10% 50% 32% 3	555
	11th to 20th	Night	3 1 6% 48% 40% 2	552
	21st to end	Night	4 7% 47% 40% 1	624
August	1st to 10th	Night	4 48% 44% 4	567
	11th to 20th	Night	4 6% 46% 40% 4	564
	21st to end	Night	4 1 4 34% 51% 6%	627
September	1st to 10th	Night	7% 1 6% 36% 43% 7%	570
	11th to 20th	Night	11% 1 4 30% 46% 7%	570
	21st to end	Night	8% 7% 34% 45% 6%	570
October	1st to 10th	Night	3 2 7% 36% 48% 3	570
	11th to 20th	Night	12% 2 15% 45% 24% 2	668
	21st to end	Night	9% 5% 23% 39% 23% 1	836
November	1st to 10th	Night	11% 4 18% 41% 25% 1	748
	11th to 20th	Night	16% 4 23% 37% 19% 2	767
	21st to end	Night	19% 6% 25% 33% 16% 2	950
December	1st to 10th	Night	21% 5% 21% 38% 13% 1	950
	11th to 20th	Night	24% 7% 27% 33% 9%	950
	21st to end	Night	19% 7% 27% 37% 9%	1045

Page generated at 2024-10-30 12:19:25. Version ac07

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