Pedernales Falls State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pedernales Falls State Park clear sky chart from 2005-11-06 to 2024-09-14.

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 5% 4 4 4 4 5% 7% 48%	100482
	Night	11% 5% 2 5% 3 3 3 3 5% 7% 53%	97519
Transparency	Day	34% 6% 10% 22% 20% 9%	100293
	Night	32% 5% 11% 21% 20% 11%	97379
Seeing	Day	12% 8% 24% 31% 21% 5%	14698
	Night	13% 7% 29% 36% 14% 1	24574

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	11% 10% 2 4 2 3 3 2 5% 6% 53%	2847
	11th to 20th	Day	15% 5% 1 3 2 2 2 3 3 6% 56%	2850
	21st to end	Day	16% 8% 3 6% 4 3 3 2 3 7% 46%	3359
February	1st to 10th	Day	17% 7% 2 6% 3 3 4 3 4 5% 47%	1900
	11th to 20th	Day	16% 7% 2 5% 3 3 4 3 4 6% 47%	1849
	21st to end	Day	17% 6% 2 5% 2 2 3 3 4 5% 50%	1570
March	1st to 10th	Day	13% 8% 3 8% 4 4 3 3 4 6% 44%	3389
	11th to 20th	Day	19% 8% 3 7% 6% 5% 4 3 5% 6% 34%	3480
	21st to end	Day	12% 7% 2 6% 4 4 4 3 5% 7% 46%	3814
April	1st to 10th	Day	12% 8% 2 7% 5% 4 4 3 4 6% 45%	2090
	11th to 20th	Day	16% 8% 2 5% 4 3 4 3 5% 5% 44%	2080
	21st to end	Day	13% 6% 1 5% 4 4 4 4 5% 6% 46%	2422
May	1st to 10th	Day	20% 8% 3 7% 4 3 5% 4 5% 7% 33%	4082
	11th to 20th	Day	14% 7% 3 6% 4 4 4 3 5% 6% 44%	4082
	21st to end	Day	10% 5% 2 6% 5% 5% 7% 5% 8% 9% 36%	4477
June	1st to 10th	Day	4 3 1 5% 3 5% 7% 5% 7% 9% 50%	2470
	11th to 20th	Day	6% 4 2 5% 4 4 4 4 6% 9% 51%	2470
	21st to end	Day	6% 5% 2 6% 6% 4 5% 6% 7% 10% 43%	2470
July	1st to 10th	Day	6% 4 1 5% 4 5% 5% 4 6% 10% 50%	4120
	11th to 20th	Day	4 3 1 4 3 4 5% 4 7% 11% 54%	4120
	21st to end	Day	8% 5% 2 6% 4 5% 4 5% 8% 11% 42%	4465
August	1st to 10th	Day	1 1 1 2 2 2 2 2 5% 9% 72%	4086
	11th to 20th	Day	3 3 1 4 3 3 4 4 6% 9% 62%	3726
	21st to end	Day	4 3 2 4 4 4 5% 5% 8% 11% 50%	4024
September	1st to 10th	Day	9% 6% 2 6% 4 5% 5% 4 5% 7% 48%	2090
	11th to 20th	Day	11% 6% 2 7% 5% 5% 5% 4 6% 8% 43%	2013
	21st to end	Day	8% 3 1 6% 3 4 5% 4 6% 8% 51%	1980
October	1st to 10th	Day	7% 4 1 4 3 5% 4 4 6% 7% 55%	1980
	11th to 20th	Day	13% 4 2 4 3 4 4 3 4 6% 53%	1864
	21st to end	Day	11% 3 2 5% 3 3 3 3 4 4 59%	1980
November	1st to 10th	Day	13% 8% 2 5% 5% 3 3 3 5% 6% 48%	1858
	11th to 20th	Day	9% 6% 2 7% 4 3 5% 3 4 6% 51%	1759
	21st to end	Day	15% 7% 3 6% 3 3 4 3 4 5% 48%	1710
December	1st to 10th	Day	13% 6% 2 5% 4 3 4 3 5% 6% 50%	1710
	11th to 20th	Day	13% 8% 2 6% 5% 4 4 4 4 6% 45%	2161
	21st to end	Day	13% 7% 2 4 3 3 3 2 3 4 56%	3135
January	1st to 10th	Night	17% 8% 2 4 2 2 2 2 3 6% 55%	4108
	11th to 20th	Night	13% 4 1 3 2 2 2 1 3 4 67%	4120
	21st to end	Night	18% 7% 3 6% 4 3 3 3 4 6% 43%	4336
February	1st to 10th	Night	15% 8% 3 5% 3 3 3 2 3 6% 49%	2280
	11th to 20th	Night	16% 6% 2 5% 3 2 3 3 4 5% 51%	2218
	21st to end	Night	15% 7% 1 5% 4 4 3 3 4 6% 48%	1884
March	1st to 10th	Night	13% 7% 2 7% 4 5% 4 3 5% 7% 43%	3465
	11th to 20th	Night	19% 8% 2 7% 4 5% 5% 4 5% 6% 36%	3480
	21st to end	Night	11% 8% 3 6% 4 4 4 4 5% 6% 46%	3817
April	1st to 10th	Night	9% 6% 2 5% 3 4 5% 4 6% 8% 48%	2090
	11th to 20th	Night	15% 6% 2 6% 4 3 4 3 5% 6% 47%	2043
	21st to end	Night	15% 6% 2 4 4 3 3 3 4 6% 49%	1756
May	1st to 10th	Night	21% 9% 2 5% 3 3 3 3 5% 6% 40%	2823
	11th to 20th	Night	10% 6% 2 5% 4 3 3 3 5% 7% 51%	2823
	21st to end	Night	11% 5% 2 5% 4 4 5% 4 7% 9% 44%	3090
June	1st to 10th	Night	3 3 1 4 3 2 4 3 6% 9% 61%	1710
	11th to 20th	Night	4 2 1 3 3 3 4 4 6% 10% 61%	1710
	21st to end	Night	6% 3 1 3 3 4 4 4 6% 9% 57%	1710
July	1st to 10th	Night	6% 3 1 4 2 3 4 4 7% 9% 58%	2850
	11th to 20th	Night	3 3 1 3 3 4 4 4 6% 10% 59%	2850
	21st to end	Night	4 6% 1 5% 5% 5% 5% 4 9% 11% 45%	3098
August	1st to 10th	Night	1 1 1 1 1 2 3 2 5% 8% 77%	2836
	11th to 20th	Night	3 2 1 3 3 3 4 3 7% 9% 63%	3113
	21st to end	Night	4 3 1 3 3 3 5% 4 7% 11% 57%	3637
September	1st to 10th	Night	8% 5% 2 4 4 4 4 3 6% 7% 54%	2090
	11th to 20th	Night	9% 5% 2 5% 4 4 5% 4 6% 8% 48%	2024
	21st to end	Night	8% 4 1 4 3 3 4 4 5% 8% 54%	1980
October	1st to 10th	Night	5% 3 1 4 2 3 3 3 5% 6% 64%	1980
	11th to 20th	Night	12% 4 2 4 3 2 3 3 4 6% 56%	2077
	21st to end	Night	11% 5% 1 3 3 3 2 2 4 5% 60%	2376
November	1st to 10th	Night	11% 5% 2 5% 3 3 3 2 4 6% 56%	2220
	11th to 20th	Night	8% 5% 2 4 3 3 4 3 5% 7% 56%	2417
	21st to end	Night	15% 4 2 5% 4 4 4 3 5% 6% 47%	2470
December	1st to 10th	Night	12% 6% 1 4 3 3 3 3 4 7% 53%	2470
	11th to 20th	Night	14% 8% 2 6% 4 3 3 3 4 4 47%	3036
	21st to end	Night	15% 7% 2 4 2 3 3 2 3 5% 56%	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	34% 3 4 19% 25% 15%	2848
	11th to 20th	Day	32% 2 6% 14% 31% 15%	2850
	21st to end	Day	41% 3 5% 10% 29% 12%	3359
February	1st to 10th	Day	41% 4 5% 13% 20% 17%	1900
	11th to 20th	Day	39% 3 8% 17% 19% 14%	1859
	21st to end	Day	37% 4 6% 17% 20% 16%	1570
March	1st to 10th	Day	42% 4 6% 13% 20% 14%	3389
	11th to 20th	Day	52% 5% 7% 10% 17% 9%	3480
	21st to end	Day	37% 5% 10% 16% 21% 12%	3814
April	1st to 10th	Day	41% 4 8% 17% 16% 13%	2090
	11th to 20th	Day	42% 5% 8% 15% 19% 11%	2080
	21st to end	Day	38% 5% 6% 22% 19% 10%	2422
May	1st to 10th	Day	50% 6% 9% 15% 15% 5%	4120
	11th to 20th	Day	41% 5% 8% 16% 23% 7%	4086
	21st to end	Day	38% 9% 13% 27% 11% 2	4489
June	1st to 10th	Day	28% 7% 13% 29% 19% 4	2470
	11th to 20th	Day	30% 5% 13% 28% 18% 6%	2470
	21st to end	Day	34% 8% 11% 25% 18% 4	2470
July	1st to 10th	Day	29% 7% 17% 37% 8% 1	4056
	11th to 20th	Day	24% 7% 16% 33% 17% 3	4051
	21st to end	Day	32% 8% 18% 30% 10% 1	4325
August	1st to 10th	Day	11% 4 12% 39% 33% 1	4072
	11th to 20th	Day	19% 4 22% 39% 13% 2	3762
	21st to end	Day	25% 10% 18% 25% 19% 3	4023
September	1st to 10th	Day	36% 6% 10% 22% 16% 9%	2090
	11th to 20th	Day	39% 8% 11% 19% 18% 6%	2013
	21st to end	Day	30% 6% 11% 21% 20% 12%	1980
October	1st to 10th	Day	28% 5% 12% 20% 24% 11%	1980
	11th to 20th	Day	33% 5% 8% 15% 22% 17%	1864
	21st to end	Day	29% 4 6% 16% 25% 21%	1980
November	1st to 10th	Day	38% 4 8% 19% 21% 11%	1858
	11th to 20th	Day	34% 5% 8% 17% 22% 14%	1759
	21st to end	Day	39% 4 6% 16% 21% 14%	1710
December	1st to 10th	Day	36% 3 10% 19% 23% 9%	1710
	11th to 20th	Day	40% 5% 7% 12% 22% 14%	2159
	21st to end	Day	34% 3 5% 15% 27% 16%	3135
January	1st to 10th	Night	34% 2 4 15% 26% 19%	4108
	11th to 20th	Night	25% 2 4 17% 28% 23%	4120
	21st to end	Night	44% 3 4 12% 24% 13%	4336
February	1st to 10th	Night	39% 3 6% 13% 21% 18%	2280
	11th to 20th	Night	37% 3 7% 16% 19% 17%	2218
	21st to end	Night	39% 4 6% 14% 19% 18%	1884
March	1st to 10th	Night	41% 5% 8% 15% 20% 11%	3465
	11th to 20th	Night	50% 6% 9% 12% 14% 10%	3480
	21st to end	Night	39% 6% 9% 17% 20% 10%	3817
April	1st to 10th	Night	34% 6% 10% 18% 17% 15%	2090
	11th to 20th	Night	39% 6% 9% 14% 18% 15%	2043
	21st to end	Night	38% 4 9% 20% 19% 10%	1756
May	1st to 10th	Night	46% 5% 9% 18% 14% 8%	2850
	11th to 20th	Night	33% 6% 11% 23% 18% 9%	2824
	21st to end	Night	34% 7% 15% 28% 10% 4	3099
June	1st to 10th	Night	19% 8% 16% 31% 22% 4	1710
	11th to 20th	Night	19% 6% 17% 29% 23% 6%	1710
	21st to end	Night	24% 7% 18% 30% 17% 4	1710
July	1st to 10th	Night	21% 8% 25% 37% 7% 1	2805
	11th to 20th	Night	20% 7% 20% 35% 17% 1	2796
	21st to end	Night	29% 9% 25% 29% 8%	2999
August	1st to 10th	Night	8% 5% 15% 41% 31% 1	2826
	11th to 20th	Night	17% 6% 29% 34% 12% 2	3143
	21st to end	Night	21% 11% 21% 26% 19% 2	3637
September	1st to 10th	Night	29% 7% 13% 24% 19% 8%	2090
	11th to 20th	Night	34% 8% 14% 23% 15% 6%	2024
	21st to end	Night	27% 7% 14% 21% 18% 12%	1980
October	1st to 10th	Night	22% 5% 14% 26% 22% 12%	1980
	11th to 20th	Night	30% 5% 9% 16% 20% 20%	2077
	21st to end	Night	29% 3 6% 16% 23% 22%	2376
November	1st to 10th	Night	31% 4 9% 19% 22% 14%	2220
	11th to 20th	Night	29% 4 9% 21% 20% 16%	2417
	21st to end	Night	38% 3 9% 15% 20% 15%	2470
December	1st to 10th	Night	33% 3 9% 20% 22% 12%	2470
	11th to 20th	Night	41% 3 5% 11% 22% 19%	3037
	21st to end	Night	34% 3 4 14% 29% 15%	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	17% 19% 36% 22% 5% 1	270
	11th to 20th	Day	23% 13% 33% 25% 6%	270
	21st to end	Day	18% 16% 35% 23% 8%	297
February	1st to 10th	Day	29% 14% 31% 19% 6%	270
	11th to 20th	Day	22% 19% 38% 18% 3	270
	21st to end	Day	27% 16% 40% 16%	225
March	1st to 10th	Day	19% 14% 46% 18% 4	270
	11th to 20th	Day	21% 18% 36% 21% 4	270
	21st to end	Day	16% 17% 44% 18% 5%	297
April	1st to 10th	Day	17% 18% 46% 14% 4	270
	11th to 20th	Day	19% 20% 36% 18% 6%	278
	21st to end	Day	17% 15% 40% 22% 6%	602
May	1st to 10th	Day	15% 12% 40% 26% 6%	653
	11th to 20th	Day	17% 8% 34% 30% 10% 1	675
	21st to end	Day	13% 7% 30% 35% 13% 1	734
June	1st to 10th	Day	5% 3 20% 42% 26% 4	680
	11th to 20th	Day	6% 3 18% 51% 20% 2	680
	21st to end	Day	6% 2 14% 41% 30% 7%	680
July	1st to 10th	Day	6% 3 10% 38% 33% 10%	671
	11th to 20th	Day	3 1 6% 40% 42% 8%	668
	21st to end	Day	4 2 5% 36% 43% 10%	739
August	1st to 10th	Day	2 5% 35% 44% 13%	671
	11th to 20th	Day	6% 1 5% 39% 37% 12%	477
	21st to end	Day	5% 1 6% 31% 37% 20%	448
September	1st to 10th	Day	7% 2 7% 27% 39% 18%	300
	11th to 20th	Day	7% 1 6% 28% 43% 14%	279
	21st to end	Day	11% 1 7% 29% 40% 12%	270
October	1st to 10th	Day	6% 2 16% 37% 32% 8%	270
	11th to 20th	Day	13% 4 25% 35% 18% 5%	270
	21st to end	Day	23% 8% 29% 23% 14% 4	297
November	1st to 10th	Day	19% 5% 27% 36% 9% 4	270
	11th to 20th	Day	17% 9% 30% 31% 10% 3	270
	21st to end	Day	23% 19% 30% 19% 7% 2	270
December	1st to 10th	Day	17% 8% 35% 27% 10% 3	270
	11th to 20th	Day	20% 16% 34% 21% 8% 1	270
	21st to end	Day	17% 13% 38% 26% 4 2	297
January	1st to 10th	Night	17% 10% 34% 32% 7% 1	950
	11th to 20th	Night	19% 11% 33% 32% 5%	950
	21st to end	Night	18% 11% 34% 31% 6%	927
February	1st to 10th	Night	21% 12% 34% 28% 5%	760
	11th to 20th	Night	22% 11% 40% 24% 3	744
	21st to end	Night	19% 14% 45% 21% 1	628
March	1st to 10th	Night	18% 12% 41% 25% 3	605
	11th to 20th	Night	16% 12% 39% 28% 4	570
	21st to end	Night	14% 13% 43% 26% 3	627
April	1st to 10th	Night	13% 10% 45% 29% 2	570
	11th to 20th	Night	17% 11% 42% 26% 3	563
	21st to end	Night	17% 9% 45% 22% 6%	570
May	1st to 10th	Night	15% 10% 41% 29% 5%	570
	11th to 20th	Night	11% 7% 38% 33% 11%	561
	21st to end	Night	10% 7% 37% 36% 11%	617
June	1st to 10th	Night	4 1 25% 50% 19% 1	570
	11th to 20th	Night	4 1 35% 47% 13% 1	570
	21st to end	Night	5% 2 20% 49% 22% 3	570
July	1st to 10th	Night	8% 2 12% 49% 25% 4	555
	11th to 20th	Night	4 11% 55% 27% 2	552
	21st to end	Night	4 1 9% 55% 28% 3	624
August	1st to 10th	Night	1 9% 56% 31% 3	567
	11th to 20th	Night	4 1 7% 54% 30% 3	564
	21st to end	Night	5% 1 4 48% 36% 5%	627
September	1st to 10th	Night	8% 2 9% 44% 32% 4	570
	11th to 20th	Night	10% 2 7% 40% 37% 4	552
	21st to end	Night	11% 1 13% 39% 34% 3	540
October	1st to 10th	Night	6% 2 14% 47% 27% 3	540
	11th to 20th	Night	12% 4 24% 40% 18% 2	637
	21st to end	Night	14% 9% 28% 30% 19% 1	792
November	1st to 10th	Night	13% 5% 24% 41% 16% 1	740
	11th to 20th	Night	11% 6% 30% 38% 13% 1	897
	21st to end	Night	16% 10% 35% 29% 10% 1	950
December	1st to 10th	Night	16% 8% 30% 37% 9% 1	950
	11th to 20th	Night	22% 8% 31% 32% 7%	950
	21st to end	Night	18% 10% 33% 33% 7%	1045

Page generated at 2024-09-11 09:00:02. Version ac07

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