Goliad State Park & Historic Site
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Goliad State Park & Historic Site clear sky chart from 2005-11-06 to 2024-03-08.

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	12% 6% 3 5% 5% 3 5% 5% 6% 8% 42%	79038
	Night	13% 6% 2 4 4 2 4 4 5% 8% 48%	80593
Transparency	Day	39% 7% 11% 19% 16% 8%	78763
	Night	36% 6% 13% 20% 16% 9%	80388
Seeing	Day	12% 6% 21% 30% 23% 8%	13706
	Night	15% 6% 22% 35% 20% 2	23815

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	18% 9% 3 6% 4 3 3 4 4 5% 43%	2847
	11th to 20th	Day	17% 6% 2 4 3 2 2 3 4 5% 53%	2850
	21st to end	Day	22% 7% 3 4 4 2 4 5% 6% 7% 37%	3336
February	1st to 10th	Day	22% 7% 3 5% 4 3 4 3 4 5% 40%	1900
	11th to 20th	Day	19% 8% 3 5% 4 3 4 4 4 5% 41%	1849
	21st to end	Day	19% 7% 3 5% 4 2 4 4 4 5% 44%	1614
March	1st to 10th	Day	20% 7% 2 6% 5% 2 5% 4 5% 7% 36%	2057
	11th to 20th	Day	16% 8% 3 6% 5% 3 4 4 5% 6% 38%	1980
	21st to end	Day	14% 6% 2 5% 5% 3 4 5% 6% 7% 44%	2178
April	1st to 10th	Day	13% 8% 3 5% 6% 3 4 5% 6% 7% 40%	1980
	11th to 20th	Day	17% 7% 3 7% 4 3 5% 3 4 7% 40%	1956
	21st to end	Day	13% 7% 3 6% 5% 3 5% 5% 4 6% 44%	2178
May	1st to 10th	Day	10% 7% 4 7% 5% 3 5% 4 5% 9% 41%	2340
	11th to 20th	Day	10% 6% 3 5% 5% 4 6% 6% 7% 9% 40%	2302
	21st to end	Day	9% 6% 3 6% 6% 4 7% 5% 7% 10% 36%	2531
June	1st to 10th	Day	5% 4 2 4 6% 5% 6% 7% 8% 10% 44%	2340
	11th to 20th	Day	4 3 2 6% 7% 4 8% 6% 7% 10% 43%	2340
	21st to end	Day	8% 5% 3 7% 6% 4 8% 7% 8% 11% 33%	2340
July	1st to 10th	Day	12% 5% 4 6% 6% 5% 6% 7% 7% 9% 34%	2340
	11th to 20th	Day	4 3 2 5% 6% 4 8% 7% 7% 12% 42%	2340
	21st to end	Day	4 3 3 5% 5% 3 7% 7% 8% 11% 43%	2546
August	1st to 10th	Day	2 2 2 4 5% 3 5% 6% 7% 11% 53%	2328
	11th to 20th	Day	4 4 2 4 6% 4 6% 8% 9% 11% 43%	2149
	21st to end	Day	7% 5% 3 6% 7% 5% 6% 7% 9% 12% 34%	2205
September	1st to 10th	Day	8% 6% 4 8% 8% 5% 6% 6% 7% 8% 34%	1980
	11th to 20th	Day	10% 6% 3 7% 7% 4 6% 7% 7% 9% 35%	1980
	21st to end	Day	7% 6% 2 5% 6% 4 6% 6% 7% 9% 43%	1980
October	1st to 10th	Day	6% 3 2 4 5% 3 6% 6% 7% 10% 48%	1980
	11th to 20th	Day	11% 5% 2 5% 5% 3 5% 5% 5% 6% 49%	1828
	21st to end	Day	10% 3 2 4 5% 3 4 4 3 7% 54%	1980
November	1st to 10th	Day	12% 5% 2 5% 7% 3 6% 5% 5% 9% 41%	1858
	11th to 20th	Day	14% 6% 2 5% 4 3 4 4 4 6% 47%	1900
	21st to end	Day	17% 7% 4 6% 5% 3 4 5% 4 5% 39%	1720
December	1st to 10th	Day	19% 7% 3 5% 4 3 3 3 4 7% 41%	1710
	11th to 20th	Day	17% 8% 4 5% 5% 4 4 4 5% 5% 39%	2161
	21st to end	Day	16% 7% 2 5% 5% 2 3 4 4 6% 46%	3135
January	1st to 10th	Night	21% 8% 2 4 4 2 3 3 4 5% 44%	4108
	11th to 20th	Night	16% 4 2 3 3 1 3 2 3 6% 56%	4120
	21st to end	Night	26% 5% 3 5% 4 2 3 4 5% 7% 36%	4358
February	1st to 10th	Night	20% 8% 3 5% 5% 3 4 3 4 6% 41%	2280
	11th to 20th	Night	20% 6% 2 4 4 2 2 3 4 7% 44%	2218
	21st to end	Night	21% 8% 2 5% 3 3 4 4 5% 5% 42%	1837
March	1st to 10th	Night	20% 8% 2 5% 4 3 4 4 4 6% 40%	2063
	11th to 20th	Night	19% 9% 3 5% 4 2 4 4 4 7% 40%	1980
	21st to end	Night	15% 7% 3 4 4 2 3 3 4 6% 50%	2178
April	1st to 10th	Night	14% 7% 3 5% 5% 3 5% 5% 5% 8% 39%	1980
	11th to 20th	Night	18% 6% 3 6% 4 3 4 4 4 7% 42%	1953
	21st to end	Night	15% 8% 4 6% 5% 3 4 4 5% 7% 39%	1777
May	1st to 10th	Night	12% 7% 3 5% 6% 3 4 5% 6% 9% 39%	1620
	11th to 20th	Night	12% 4 3 4 5% 4 4 4 5% 10% 45%	1593
	21st to end	Night	10% 4 3 5% 5% 4 5% 7% 7% 12% 40%	1745
June	1st to 10th	Night	6% 3 2 3 4 2 4 6% 5% 10% 55%	1620
	11th to 20th	Night	6% 3 1 4 4 3 6% 5% 6% 9% 53%	1620
	21st to end	Night	6% 4 2 4 5% 4 6% 6% 8% 11% 45%	1620
July	1st to 10th	Night	7% 5% 3 5% 5% 3 5% 5% 7% 11% 44%	1620
	11th to 20th	Night	2 2 1 2 4 2 4 5% 6% 12% 58%	1620
	21st to end	Night	2 2 1 3 4 2 4 4 7% 12% 59%	1772
August	1st to 10th	Night	1 1 1 2 2 3 3 7% 10% 70%	1611
	11th to 20th	Night	3 3 2 4 3 2 4 5% 5% 13% 57%	1747
	21st to end	Night	5% 4 2 4 5% 3 3 5% 7% 12% 52%	2150
September	1st to 10th	Night	7% 4 2 4 4 3 5% 6% 6% 11% 48%	1980
	11th to 20th	Night	8% 5% 2 6% 4 3 4 5% 6% 8% 48%	1980
	21st to end	Night	8% 3 1 5% 4 3 5% 4 6% 8% 54%	1980
October	1st to 10th	Night	5% 4 1 3 3 3 3 4 6% 6% 62%	1980
	11th to 20th	Night	10% 5% 2 4 4 2 3 3 3 6% 57%	2113
	21st to end	Night	10% 4 2 3 4 2 3 3 3 5% 63%	2376
November	1st to 10th	Night	11% 5% 2 4 5% 2 4 4 5% 6% 54%	2220
	11th to 20th	Night	13% 7% 2 5% 4 2 3 4 4 5% 50%	2280
	21st to end	Night	16% 6% 2 5% 5% 3 4 4 5% 7% 44%	2456
December	1st to 10th	Night	19% 7% 2 4 3 2 3 4 4 7% 45%	2470
	11th to 20th	Night	18% 8% 3 6% 5% 3 4 4 4 7% 39%	3036
	21st to end	Night	15% 7% 3 5% 4 3 4 4 5% 6% 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	45% 4 4 13% 21% 13%	2848
	11th to 20th	Day	34% 4 5% 23% 20% 13%	2850
	21st to end	Day	46% 3 5% 15% 23% 7%	3336
February	1st to 10th	Day	48% 4 6% 10% 19% 13%	1900
	11th to 20th	Day	46% 4 8% 15% 16% 12%	1859
	21st to end	Day	42% 6% 7% 17% 15% 12%	1614
March	1st to 10th	Day	47% 6% 10% 14% 15% 7%	2057
	11th to 20th	Day	47% 6% 8% 12% 16% 12%	1980
	21st to end	Day	38% 6% 11% 16% 17% 11%	2178
April	1st to 10th	Day	43% 7% 10% 15% 17% 9%	1980
	11th to 20th	Day	46% 6% 7% 16% 15% 11%	1956
	21st to end	Day	41% 5% 8% 19% 17% 10%	2178
May	1st to 10th	Day	39% 7% 11% 21% 14% 8%	2340
	11th to 20th	Day	38% 9% 11% 19% 19% 4	2306
	21st to end	Day	41% 9% 13% 21% 15% 1	2531
June	1st to 10th	Day	30% 9% 15% 26% 17% 1	2340
	11th to 20th	Day	34% 8% 12% 26% 16% 4	2340
	21st to end	Day	42% 10% 13% 25% 9% 1	2340
July	1st to 10th	Day	42% 10% 16% 24% 8%	2276
	11th to 20th	Day	32% 10% 19% 24% 15%	2271
	21st to end	Day	28% 11% 23% 32% 6% 1	2405
August	1st to 10th	Day	24% 9% 20% 36% 12%	2314
	11th to 20th	Day	29% 12% 19% 29% 9% 1	2149
	21st to end	Day	38% 12% 19% 21% 8% 2	2205
September	1st to 10th	Day	45% 11% 12% 15% 14% 4	1980
	11th to 20th	Day	42% 9% 15% 19% 13% 3	1980
	21st to end	Day	35% 9% 12% 17% 18% 9%	1980
October	1st to 10th	Day	29% 9% 11% 21% 21% 9%	1980
	11th to 20th	Day	35% 6% 9% 18% 18% 14%	1828
	21st to end	Day	31% 5% 7% 16% 23% 18%	1980
November	1st to 10th	Day	40% 7% 9% 16% 18% 9%	1858
	11th to 20th	Day	39% 5% 9% 16% 18% 13%	1900
	21st to end	Day	46% 6% 7% 16% 15% 11%	1720
December	1st to 10th	Day	44% 5% 8% 17% 18% 8%	1710
	11th to 20th	Day	46% 6% 6% 10% 19% 13%	2159
	21st to end	Day	40% 4 6% 18% 19% 12%	3135
January	1st to 10th	Night	43% 4 7% 12% 15% 19%	4108
	11th to 20th	Night	32% 3 5% 19% 25% 16%	4120
	21st to end	Night	48% 4 5% 12% 21% 10%	4358
February	1st to 10th	Night	46% 4 9% 10% 16% 15%	2280
	11th to 20th	Night	42% 5% 8% 15% 17% 13%	2218
	21st to end	Night	45% 5% 7% 17% 16% 10%	1837
March	1st to 10th	Night	45% 5% 11% 15% 15% 9%	2063
	11th to 20th	Night	46% 5% 10% 13% 15% 12%	1980
	21st to end	Night	37% 5% 12% 16% 17% 12%	2178
April	1st to 10th	Night	43% 6% 11% 17% 14% 8%	1980
	11th to 20th	Night	43% 5% 9% 15% 14% 14%	1953
	21st to end	Night	45% 5% 10% 16% 14% 9%	1777
May	1st to 10th	Night	41% 8% 12% 17% 13% 9%	1620
	11th to 20th	Night	35% 6% 14% 24% 17% 4	1594
	21st to end	Night	35% 10% 17% 26% 11% 1	1746
June	1st to 10th	Night	24% 6% 20% 31% 17% 1	1620
	11th to 20th	Night	28% 7% 12% 33% 18% 3	1620
	21st to end	Night	31% 11% 21% 28% 9% 1	1620
July	1st to 10th	Night	31% 10% 22% 30% 6%	1575
	11th to 20th	Night	19% 10% 28% 32% 11%	1566
	21st to end	Night	17% 10% 31% 36% 6%	1673
August	1st to 10th	Night	11% 8% 29% 43% 9%	1601
	11th to 20th	Night	20% 8% 32% 35% 5%	1747
	21st to end	Night	25% 11% 26% 29% 8% 1	2150
September	1st to 10th	Night	31% 10% 23% 21% 12% 4	1980
	11th to 20th	Night	32% 10% 17% 24% 14% 3	1980
	21st to end	Night	27% 8% 16% 24% 18% 7%	1980
October	1st to 10th	Night	22% 6% 14% 28% 20% 10%	1980
	11th to 20th	Night	29% 5% 11% 22% 20% 14%	2113
	21st to end	Night	26% 4 7% 19% 24% 20%	2376
November	1st to 10th	Night	32% 5% 11% 19% 22% 10%	2220
	11th to 20th	Night	36% 5% 12% 17% 17% 13%	2280
	21st to end	Night	41% 4 10% 18% 17% 10%	2456
December	1st to 10th	Night	41% 4 9% 19% 16% 9%	2470
	11th to 20th	Night	46% 4 6% 13% 15% 15%	3037
	21st to end	Night	40% 6% 6% 15% 22% 11%	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	21% 9% 31% 30% 7% 2	270
	11th to 20th	Day	23% 8% 33% 27% 8% 1	270
	21st to end	Day	19% 14% 33% 23% 11%	297
February	1st to 10th	Day	23% 14% 29% 23% 10%	270
	11th to 20th	Day	25% 13% 33% 20% 9% 1	270
	21st to end	Day	23% 14% 40% 17% 6%	225
March	1st to 10th	Day	20% 14% 36% 23% 8%	261
	11th to 20th	Day	19% 13% 40% 22% 5%	240
	21st to end	Day	17% 13% 39% 24% 7% 1	264
April	1st to 10th	Day	18% 12% 40% 25% 5%	240
	11th to 20th	Day	21% 15% 31% 23% 9% 1	234
	21st to end	Day	14% 11% 39% 26% 9%	438
May	1st to 10th	Day	13% 11% 42% 27% 7%	603
	11th to 20th	Day	13% 6% 34% 32% 13% 2	625
	21st to end	Day	9% 4 32% 34% 19% 1	679
June	1st to 10th	Day	6% 1 17% 37% 32% 7%	630
	11th to 20th	Day	5% 1 16% 46% 26% 6%	630
	21st to end	Day	9% 3 12% 35% 29% 13%	630
July	1st to 10th	Day	9% 3 7% 34% 33% 14%	621
	11th to 20th	Day	4 5% 33% 44% 14%	618
	21st to end	Day	4 1 4 36% 38% 17%	684
August	1st to 10th	Day	3 1 4 34% 40% 19%	626
	11th to 20th	Day	3 1 5% 37% 34% 19%	463
	21st to end	Day	7% 1 6% 24% 30% 32%	324
September	1st to 10th	Day	9% 4 21% 42% 24%	270
	11th to 20th	Day	8% 1 4 19% 43% 25%	270
	21st to end	Day	10% 1 5% 26% 41% 18%	270
October	1st to 10th	Day	5% 2 13% 30% 37% 13%	270
	11th to 20th	Day	12% 3 14% 34% 25% 12%	270
	21st to end	Day	14% 8% 22% 31% 18% 6%	297
November	1st to 10th	Day	16% 4 14% 33% 26% 6%	270
	11th to 20th	Day	20% 5% 23% 27% 21% 4	270
	21st to end	Day	23% 13% 31% 20% 10% 3	270
December	1st to 10th	Day	19% 6% 24% 34% 13% 4	270
	11th to 20th	Day	23% 12% 30% 23% 10% 1	270
	21st to end	Day	21% 9% 34% 24% 11% 2	297
January	1st to 10th	Night	23% 8% 29% 29% 11%	950
	11th to 20th	Night	22% 9% 26% 34% 8%	950
	21st to end	Night	23% 8% 30% 33% 6%	936
February	1st to 10th	Night	24% 12% 29% 30% 5%	760
	11th to 20th	Night	23% 11% 31% 31% 5%	744
	21st to end	Night	28% 8% 38% 23% 4	581
March	1st to 10th	Night	26% 9% 30% 30% 6%	563
	11th to 20th	Night	23% 9% 29% 35% 5%	540
	21st to end	Night	18% 10% 34% 32% 6%	594
April	1st to 10th	Night	16% 7% 43% 29% 5%	540
	11th to 20th	Night	21% 9% 31% 31% 7%	533
	21st to end	Night	17% 9% 40% 28% 6%	540
May	1st to 10th	Night	14% 8% 42% 31% 5%	540
	11th to 20th	Night	13% 4 30% 41% 11% 1	531
	21st to end	Night	9% 3 30% 41% 16%	584
June	1st to 10th	Night	6% 2 15% 50% 26% 1	540
	11th to 20th	Night	6% 1 17% 53% 22% 1	540
	21st to end	Night	8% 1 11% 41% 35% 3	540
July	1st to 10th	Night	8% 1 7% 44% 35% 5%	525
	11th to 20th	Night	2 1 6% 39% 47% 5%	522
	21st to end	Night	2 1 5% 44% 44% 5%	591
August	1st to 10th	Night	1 3 45% 46% 5%	537
	11th to 20th	Night	4 4 40% 47% 5%	534
	21st to end	Night	5% 1 4 30% 53% 8%	594
September	1st to 10th	Night	9% 1 3 31% 49% 7%	540
	11th to 20th	Night	10% 2 4 32% 47% 6%	540
	21st to end	Night	9% 1 9% 31% 46% 4	540
October	1st to 10th	Night	7% 1 7% 39% 42% 4	540
	11th to 20th	Night	12% 3 19% 44% 21% 2	673
	21st to end	Night	11% 5% 23% 38% 21% 1	792
November	1st to 10th	Night	11% 4 21% 41% 21% 1	740
	11th to 20th	Night	17% 5% 22% 37% 17% 2	760
	21st to end	Night	18% 7% 28% 30% 16% 1	936
December	1st to 10th	Night	21% 7% 23% 32% 15% 1	950
	11th to 20th	Night	23% 10% 28% 31% 9% 1	950
	21st to end	Night	21% 8% 28% 33% 9% 1	1045

Page generated at 2024-03-05 06:24:04. Version ac07

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