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 2024-11-02.

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	12% 6% 2 6% 5% 5% 5% 4 6% 8% 41%	100948
	Night	14% 6% 2 5% 3 4 4 3 5% 7% 47%	98137
Transparency	Day	39% 7% 12% 21% 14% 7%	100760
	Night	36% 6% 13% 21% 15% 8%	97996
Seeing	Day	12% 6% 21% 30% 22% 8%	14650
	Night	15% 6% 22% 35% 20% 2	24554

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 7% 4 3 3 3 4 5% 42%	2847
	11th to 20th	Day	16% 6% 2 4 3 2 2 3 4 5% 53%	2850
	21st to end	Day	22% 7% 2 5% 4 3 4 4 6% 7% 36%	3336
February	1st to 10th	Day	21% 8% 3 6% 4 4 3 3 4 4 40%	1900
	11th to 20th	Day	19% 8% 2 5% 4 4 3 3 4 5% 41%	1849
	21st to end	Day	18% 8% 2 5% 3 3 4 3 4 5% 44%	1614
March	1st to 10th	Day	17% 8% 3 8% 5% 5% 4 4 6% 8% 32%	3436
	11th to 20th	Day	22% 10% 3 9% 5% 5% 4 3 5% 5% 28%	3480
	21st to end	Day	12% 5% 2 5% 4 4 4 5% 6% 7% 46%	3814
April	1st to 10th	Day	13% 8% 2 6% 5% 4 4 4 6% 6% 41%	2090
	11th to 20th	Day	16% 7% 3 8% 4 4 4 3 4 7% 39%	2066
	21st to end	Day	12% 8% 2 7% 5% 4 5% 4 5% 6% 42%	2299
May	1st to 10th	Day	18% 7% 3 7% 5% 4 5% 4 5% 8% 34%	4082
	11th to 20th	Day	12% 7% 2 6% 5% 4 5% 4 6% 7% 41%	4082
	21st to end	Day	7% 6% 2 6% 5% 5% 5% 4 7% 10% 43%	4477
June	1st to 10th	Day	5% 4 1 5% 5% 6% 6% 5% 8% 9% 45%	2470
	11th to 20th	Day	5% 4 2 7% 6% 6% 6% 6% 7% 10% 42%	2470
	21st to end	Day	8% 6% 2 7% 6% 7% 7% 6% 8% 11% 33%	2470
July	1st to 10th	Day	8% 5% 2 6% 5% 6% 6% 5% 8% 10% 39%	4120
	11th to 20th	Day	6% 7% 3 8% 6% 7% 8% 7% 8% 12% 29%	4120
	21st to end	Day	10% 8% 3 8% 6% 5% 6% 5% 7% 10% 33%	4465
August	1st to 10th	Day	1 2 1 3 3 3 4 4 7% 10% 63%	4104
	11th to 20th	Day	2 3 1 3 4 5% 7% 7% 9% 12% 45%	3765
	21st to end	Day	5% 4 2 8% 6% 7% 6% 5% 9% 12% 35%	3869
September	1st to 10th	Day	9% 6% 3 9% 7% 6% 6% 5% 7% 8% 34%	2090
	11th to 20th	Day	10% 6% 3 7% 6% 6% 6% 6% 8% 9% 35%	2090
	21st to end	Day	7% 6% 2 5% 5% 5% 5% 5% 7% 9% 45%	2090
October	1st to 10th	Day	6% 3 2 4 4 4 5% 5% 7% 9% 50%	2090
	11th to 20th	Day	11% 6% 2 6% 4 4 5% 3 4 6% 50%	1929
	21st to end	Day	10% 3 2 5% 4 4 4 4 4 7% 54%	2090
November	1st to 10th	Day	12% 6% 2 6% 6% 5% 5% 4 5% 9% 41%	1868
	11th to 20th	Day	14% 6% 2 6% 4 4 4 3 5% 6% 46%	1900
	21st to end	Day	17% 8% 4 7% 4 4 4 4 4 6% 39%	1720
December	1st to 10th	Day	18% 8% 2 5% 4 4 3 3 5% 6% 41%	1710
	11th to 20th	Day	17% 9% 3 6% 5% 4 4 3 5% 5% 39%	2161
	21st to end	Day	16% 7% 2 6% 4 3 3 3 4 7% 45%	3135
January	1st to 10th	Night	21% 9% 2 5% 3 2 3 2 4 5% 44%	4108
	11th to 20th	Night	16% 5% 2 4 2 2 2 2 3 6% 56%	4120
	21st to end	Night	26% 5% 2 5% 4 3 3 3 5% 7% 36%	4358
February	1st to 10th	Night	19% 8% 3 6% 4 4 3 3 4 6% 40%	2280
	11th to 20th	Night	20% 7% 2 5% 3 3 3 2 4 7% 44%	2218
	21st to end	Night	21% 9% 2 5% 3 4 3 4 5% 4 42%	1837
March	1st to 10th	Night	25% 10% 2 6% 3 4 4 3 5% 6% 31%	3419
	11th to 20th	Night	28% 9% 4 7% 4 4 3 3 4 6% 28%	3480
	21st to end	Night	16% 6% 2 5% 3 3 3 3 4 5% 50%	3817
April	1st to 10th	Night	15% 8% 3 6% 4 4 5% 4 6% 8% 39%	2090
	11th to 20th	Night	19% 7% 2 6% 3 4 3 3 4 6% 41%	2063
	21st to end	Night	16% 9% 3 6% 4 4 4 3 6% 6% 38%	1874
May	1st to 10th	Night	25% 9% 3 6% 4 4 3 3 4 7% 30%	2823
	11th to 20th	Night	16% 8% 2 5% 4 4 3 3 5% 8% 42%	2823
	21st to end	Night	13% 5% 3 7% 4 4 4 4 6% 10% 40%	3090
June	1st to 10th	Night	7% 3 1 4 3 3 4 4 6% 10% 55%	1710
	11th to 20th	Night	7% 3 1 4 3 4 5% 4 6% 9% 53%	1710
	21st to end	Night	6% 4 2 5% 4 5% 5% 5% 8% 10% 46%	1710
July	1st to 10th	Night	5% 4 2 4 4 4 4 4 7% 10% 53%	2850
	11th to 20th	Night	4 5% 2 6% 5% 5% 6% 5% 7% 11% 43%	2850
	21st to end	Night	7% 6% 2 6% 5% 5% 5% 4 7% 10% 42%	3098
August	1st to 10th	Night	1 1 1 1 2 2 2 5% 7% 78%	2836
	11th to 20th	Night	2 2 1 3 2 3 4 4 7% 14% 59%	3069
	21st to end	Night	3 2 1 4 3 3 4 3 7% 13% 57%	3787
September	1st to 10th	Night	8% 5% 2 5% 4 4 5% 4 6% 10% 47%	2090
	11th to 20th	Night	8% 5% 2 7% 4 4 4 4 7% 8% 49%	2090
	21st to end	Night	7% 3 1 6% 3 3 5% 3 6% 8% 55%	2090
October	1st to 10th	Night	4 4 1 3 2 3 3 3 6% 6% 63%	2090
	11th to 20th	Night	10% 5% 2 4 3 3 3 3 3 6% 59%	2231
	21st to end	Night	10% 4 1 3 3 2 3 2 3 5% 64%	2508
November	1st to 10th	Night	11% 5% 2 5% 4 3 3 3 5% 5% 53%	2244
	11th to 20th	Night	13% 7% 2 6% 3 3 4 3 4 5% 50%	2280
	21st to end	Night	16% 6% 2 6% 4 4 3 3 5% 7% 44%	2456
December	1st to 10th	Night	19% 7% 2 4 3 3 3 3 4 7% 45%	2470
	11th to 20th	Night	18% 9% 2 7% 4 4 4 3 4 7% 38%	3036
	21st to end	Night	15% 7% 3 6% 3 4 3 3 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	49% 7% 9% 17% 13% 5%	3436
	11th to 20th	Day	57% 6% 7% 9% 14% 7%	3480
	21st to end	Day	35% 7% 10% 19% 18% 11%	3814
April	1st to 10th	Day	42% 7% 9% 14% 16% 11%	2090
	11th to 20th	Day	45% 6% 7% 17% 14% 11%	2066
	21st to end	Day	42% 6% 8% 19% 16% 10%	2299
May	1st to 10th	Day	47% 8% 13% 19% 10% 5%	4120
	11th to 20th	Day	39% 9% 9% 18% 18% 7%	4086
	21st to end	Day	33% 8% 12% 37% 10% 1	4489
June	1st to 10th	Day	29% 9% 16% 27% 18% 1	2470
	11th to 20th	Day	34% 8% 12% 26% 17% 4	2470
	21st to end	Day	41% 10% 14% 25% 8% 1	2470
July	1st to 10th	Day	35% 9% 21% 29% 5%	4056
	11th to 20th	Day	43% 11% 17% 20% 9%	4051
	21st to end	Day	42% 10% 20% 25% 3	4325
August	1st to 10th	Day	16% 7% 14% 48% 15%	4090
	11th to 20th	Day	25% 11% 26% 31% 6% 1	3802
	21st to end	Day	37% 11% 18% 23% 10% 1	3868
September	1st to 10th	Day	45% 11% 11% 15% 14% 4	2090
	11th to 20th	Day	41% 9% 15% 19% 14% 3	2090
	21st to end	Day	34% 9% 12% 18% 17% 11%	2090
October	1st to 10th	Day	28% 8% 10% 21% 21% 12%	2090
	11th to 20th	Day	35% 6% 9% 18% 18% 14%	1929
	21st to end	Day	31% 5% 6% 16% 24% 17%	2090
November	1st to 10th	Day	40% 7% 9% 16% 18% 9%	1868
	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	52% 6% 9% 15% 12% 6%	3419
	11th to 20th	Night	58% 6% 8% 12% 9% 7%	3480
	21st to end	Night	36% 5% 12% 15% 21% 11%	3817
April	1st to 10th	Night	43% 6% 11% 17% 13% 9%	2090
	11th to 20th	Night	44% 5% 9% 14% 13% 14%	2063
	21st to end	Night	46% 5% 11% 16% 14% 8%	1874
May	1st to 10th	Night	53% 7% 10% 16% 9% 6%	2850
	11th to 20th	Night	40% 7% 13% 19% 16% 6%	2824
	21st to end	Night	38% 10% 15% 31% 7%	3099
June	1st to 10th	Night	24% 7% 20% 31% 17% 1	1710
	11th to 20th	Night	28% 7% 12% 32% 19% 3	1710
	21st to end	Night	30% 10% 20% 30% 8% 1	1710
July	1st to 10th	Night	26% 9% 27% 35% 3	2805
	11th to 20th	Night	32% 11% 25% 24% 8%	2796
	21st to end	Night	35% 11% 25% 25% 4	2999
August	1st to 10th	Night	7% 5% 18% 56% 14%	2826
	11th to 20th	Night	16% 7% 41% 33% 3	3098
	21st to end	Night	19% 12% 28% 31% 9% 1	3787
September	1st to 10th	Night	31% 10% 22% 21% 12% 4	2090
	11th to 20th	Night	31% 10% 16% 24% 15% 4	2090
	21st to end	Night	26% 7% 15% 24% 18% 9%	2090
October	1st to 10th	Night	21% 6% 13% 27% 20% 13%	2090
	11th to 20th	Night	28% 5% 10% 22% 21% 14%	2231
	21st to end	Night	25% 4 7% 20% 25% 19%	2508
November	1st to 10th	Night	32% 6% 11% 19% 22% 10%	2244
	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% 7%	270
	11th to 20th	Day	19% 14% 40% 21% 5%	270
	21st to end	Day	16% 15% 39% 24% 6% 1	297
April	1st to 10th	Day	17% 15% 38% 24% 5%	270
	11th to 20th	Day	19% 16% 35% 20% 9% 1	264
	21st to end	Day	14% 11% 41% 26% 8%	479
May	1st to 10th	Day	14% 12% 42% 25% 7%	653
	11th to 20th	Day	12% 7% 35% 32% 12% 2	675
	21st to end	Day	9% 5% 34% 33% 18% 1	734
June	1st to 10th	Day	5% 1 19% 37% 31% 7%	680
	11th to 20th	Day	5% 1 16% 45% 26% 6%	680
	21st to end	Day	9% 3 12% 36% 29% 12%	680
July	1st to 10th	Day	9% 3 8% 34% 32% 15%	671
	11th to 20th	Day	5% 1 6% 32% 43% 14%	668
	21st to end	Day	6% 2 4 36% 37% 16%	739
August	1st to 10th	Day	2 1 4 33% 40% 21%	676
	11th to 20th	Day	3 1 5% 38% 34% 20%	504
	21st to end	Day	7% 1 5% 24% 31% 32%	358
September	1st to 10th	Day	11% 6% 22% 39% 22%	300
	11th to 20th	Day	8% 1 5% 21% 41% 25%	300
	21st to end	Day	9% 1 5% 27% 40% 19%	300
October	1st to 10th	Day	5% 2 12% 31% 37% 13%	300
	11th to 20th	Day	11% 2 13% 35% 26% 13%	300
	21st to end	Day	13% 8% 21% 32% 18% 8%	330
November	1st to 10th	Day	16% 5% 14% 33% 26% 5%	273
	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	25% 9% 30% 30% 6%	570
	11th to 20th	Night	23% 9% 29% 34% 4	570
	21st to end	Night	18% 10% 35% 31% 5%	627
April	1st to 10th	Night	17% 8% 43% 28% 5%	570
	11th to 20th	Night	21% 10% 32% 29% 7%	563
	21st to end	Night	18% 10% 39% 27% 6%	570
May	1st to 10th	Night	16% 8% 42% 30% 5%	570
	11th to 20th	Night	13% 4 30% 41% 10% 1	561
	21st to end	Night	10% 4 31% 41% 15%	617
June	1st to 10th	Night	6% 2 16% 49% 26% 1	570
	11th to 20th	Night	7% 1 17% 52% 22% 1	570
	21st to end	Night	8% 1 12% 41% 35% 3	570
July	1st to 10th	Night	8% 1 7% 44% 35% 5%	555
	11th to 20th	Night	2 1 6% 39% 47% 5%	552
	21st to end	Night	4 1 5% 43% 43% 5%	624
August	1st to 10th	Night	1 3 43% 47% 5%	567
	11th to 20th	Night	4 4 40% 47% 5%	564
	21st to end	Night	5% 1 4 29% 53% 8%	627
September	1st to 10th	Night	10% 1 4 31% 47% 7%	570
	11th to 20th	Night	9% 2 4 32% 47% 5%	570
	21st to end	Night	9% 1 9% 31% 47% 5%	570
October	1st to 10th	Night	6% 1 7% 40% 42% 4	570
	11th to 20th	Night	11% 3 19% 45% 21% 2	711
	21st to end	Night	10% 5% 23% 38% 22% 1	836
November	1st to 10th	Night	12% 4 20% 41% 21% 1	748
	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 2024-10-30 12:19:23. Version ac07

Copyright © 2024 Attilla Danko.