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 2025-02-21.

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%	109198
	Night	12% 6% 2 5% 3 3 3 3 5% 7% 52%	109609
Transparency	Day	34% 5% 10% 21% 20% 10%	113016
	Night	32% 5% 10% 20% 21% 12%	113918
Seeing	Day	12% 8% 24% 31% 20% 5%	15178
	Night	13% 7% 29% 36% 14% 1	25253

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	13% 10% 2 5% 3 3 3 2 4 4 51%	4077
	11th to 20th	Day	15% 5% 1 3 2 2 2 3 5% 7% 54%	4080
	21st to end	Day	23% 9% 2 6% 3 2 2 2 3 5% 43%	4810
February	1st to 10th	Day	17% 6% 2 6% 3 3 4 3 4 5% 48%	2000
	11th to 20th	Day	15% 7% 2 5% 3 3 4 3 5% 6% 47%	1949
	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	10% 6% 2 7% 5% 5% 5% 4 6% 7% 44%	2090
	21st to end	Day	8% 3 1 6% 3 4 5% 4 5% 8% 52%	2090
October	1st to 10th	Day	7% 4 1 3 3 4 4 4 5% 7% 58%	2090
	11th to 20th	Day	12% 4 2 4 3 4 4 3 4 6% 55%	1967
	21st to end	Day	11% 3 2 5% 3 3 3 3 4 5% 59%	2090
November	1st to 10th	Day	13% 8% 2 5% 5% 3 3 3 4 6% 47%	1958
	11th to 20th	Day	9% 5% 2 6% 3 3 5% 3 4 6% 52%	1851
	21st to end	Day	15% 6% 3 6% 3 3 4 3 4 5% 49%	1800
December	1st to 10th	Day	23% 7% 3 6% 4 3 3 2 4 5% 41%	2940
	11th to 20th	Day	12% 8% 2 6% 5% 4 4 4 5% 5% 44%	3391
	21st to end	Day	10% 6% 2 5% 2 3 3 3 3 4 59%	4488
January	1st to 10th	Night	16% 7% 2 4 2 2 2 2 3 5% 53%	5888
	11th to 20th	Night	12% 3 1 2 2 1 2 2 4 5% 66%	5900
	21st to end	Night	25% 7% 2 5% 3 3 3 2 4 5% 41%	6196
February	1st to 10th	Night	15% 7% 2 5% 3 2 3 2 3 6% 50%	2400
	11th to 20th	Night	17% 6% 2 5% 3 2 3 3 4 5% 51%	2338
	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% 6% 2 5% 4 4 5% 4 6% 8% 48%	2090
	21st to end	Night	8% 3 1 4 3 3 4 4 5% 8% 55%	2090
October	1st to 10th	Night	5% 3 1 4 2 3 3 3 5% 6% 65%	2090
	11th to 20th	Night	11% 4 2 4 3 2 3 3 4 6% 57%	2193
	21st to end	Night	11% 5% 1 3 3 3 2 2 4 5% 60%	2508
November	1st to 10th	Night	12% 6% 2 5% 3 3 3 2 4 6% 54%	2340
	11th to 20th	Night	8% 5% 2 4 3 3 3 3 5% 7% 57%	2545
	21st to end	Night	15% 4 2 5% 4 4 4 3 4 6% 49%	2600
December	1st to 10th	Night	19% 8% 2 6% 3 3 4 3 4 5% 43%	4250
	11th to 20th	Night	13% 9% 3 6% 4 3 3 3 4 4 48%	4816
	21st to end	Night	12% 7% 2 5% 2 2 3 2 3 4 59%	6490

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	38% 3 4 23% 21% 11%	4078
	11th to 20th	Day	32% 2 5% 16% 26% 19%	4080
	21st to end	Day	46% 2 4 9% 25% 14%	4810
February	1st to 10th	Day	41% 4 5% 12% 20% 18%	2000
	11th to 20th	Day	39% 3 8% 17% 19% 13%	1959
	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	38% 8% 11% 19% 19% 6%	2090
	21st to end	Day	29% 7% 10% 21% 19% 14%	2090
October	1st to 10th	Day	16% 3 7% 12% 25% 37%	3480
	11th to 20th	Day	21% 4 9% 19% 26% 22%	3246
	21st to end	Day	23% 4 5% 19% 35% 14%	3428
November	1st to 10th	Day	38% 4 8% 18% 20% 12%	1958
	11th to 20th	Day	33% 5% 8% 17% 22% 16%	1851
	21st to end	Day	38% 4 6% 17% 20% 14%	1800
December	1st to 10th	Day	48% 2 6% 17% 18% 9%	2940
	11th to 20th	Day	40% 6% 7% 12% 22% 13%	3389
	21st to end	Day	30% 3 4 17% 27% 19%	4488
January	1st to 10th	Night	35% 3 4 19% 26% 13%	5888
	11th to 20th	Night	24% 2 4 19% 29% 23%	5900
	21st to end	Night	47% 3 3 10% 20% 16%	6196
February	1st to 10th	Night	38% 4 6% 13% 21% 19%	2400
	11th to 20th	Night	38% 3 7% 17% 19% 16%	2338
	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% 7% 14% 23% 16% 6%	2090
	21st to end	Night	27% 7% 14% 21% 18% 13%	2090
October	1st to 10th	Night	13% 3 8% 15% 21% 39%	3480
	11th to 20th	Night	19% 4 10% 17% 29% 22%	3640
	21st to end	Night	21% 4 6% 19% 34% 16%	4120
November	1st to 10th	Night	33% 4 9% 19% 22% 14%	2340
	11th to 20th	Night	28% 4 9% 21% 21% 17%	2545
	21st to end	Night	37% 3 10% 16% 20% 15%	2600
December	1st to 10th	Night	46% 3 7% 16% 18% 11%	4250
	11th to 20th	Night	40% 4 6% 10% 23% 17%	4817
	21st to end	Night	32% 3 4 16% 28% 17%	6490

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	18% 18% 37% 22% 5% 1	300
	11th to 20th	Day	23% 15% 32% 23% 6%	300
	21st to end	Day	20% 18% 33% 22% 7%	330
February	1st to 10th	Day	28% 14% 32% 20% 6%	300
	11th to 20th	Day	22% 20% 37% 18% 3	300
	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	6% 1 6% 29% 42% 15%	300
	21st to end	Day	10% 1 8% 32% 38% 11%	300
October	1st to 10th	Day	5% 2 15% 36% 33% 9%	300
	11th to 20th	Day	12% 3 25% 38% 17% 4	300
	21st to end	Day	21% 7% 29% 23% 16% 4	330
November	1st to 10th	Day	19% 7% 28% 34% 8% 4	300
	11th to 20th	Day	15% 9% 32% 29% 11% 4	300
	21st to end	Day	21% 18% 32% 18% 8% 3	300
December	1st to 10th	Day	20% 8% 34% 25% 10% 3	300
	11th to 20th	Day	19% 16% 34% 23% 7% 2	300
	21st to end	Day	15% 15% 37% 26% 5% 2	330
January	1st to 10th	Night	17% 10% 34% 32% 6% 1	1000
	11th to 20th	Night	19% 11% 33% 31% 5%	1000
	21st to end	Night	20% 11% 33% 30% 6%	975
February	1st to 10th	Night	20% 12% 34% 28% 6%	800
	11th to 20th	Night	22% 12% 39% 24% 3	784
	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	570
	21st to end	Night	10% 1 12% 40% 34% 2	570
October	1st to 10th	Night	6% 2 14% 46% 29% 3	570
	11th to 20th	Night	12% 4 24% 41% 18% 2	673
	21st to end	Night	13% 9% 28% 30% 19% 1	836
November	1st to 10th	Night	13% 5% 24% 41% 15% 1	780
	11th to 20th	Night	11% 6% 30% 39% 13% 1	945
	21st to end	Night	15% 10% 35% 29% 10% 1	1000
December	1st to 10th	Night	17% 8% 30% 36% 9% 1	1000
	11th to 20th	Night	22% 8% 30% 33% 7%	1000
	21st to end	Night	18% 9% 33% 33% 7%	1100

Page generated at 2025-02-18 02:26:30. Version ac07

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