Palo Duro Canyon State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Palo Duro Canyon State Park clear sky chart from 2005-11-06 to 2026-09-14.

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	6% 4 1 4 3 3 3 3 5% 7% 62%	157874
	Night	5% 4 1 4 3 3 3 3 5% 7% 61%	150696
Transparency	Day	23% 4 8% 22% 28% 15%	152947
	Night	22% 4 8% 21% 28% 16%	146635
Seeing	Day	8% 7% 28% 33% 19% 4	17832
	Night	7% 8% 32% 39% 14% 1	27675

By Month

Percentage Cloud Cover SW (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	6% 7% 3 6% 4 4 3 3 4 5% 56%	5287
	11th to 20th	Day	2 4 1 3 2 2 2 1 3 4 74%	5347
	21st to end	Day	9% 4 1 5% 4 3 3 2 4 6% 58%	6468
February	1st to 10th	Day	5% 5% 2 4 3 2 3 3 5% 6% 63%	2100
	11th to 20th	Day	5% 7% 2 5% 3 3 3 2 4 6% 59%	2049
	21st to end	Day	3 6% 2 3 3 3 3 2 4 6% 65%	1730
March	1st to 10th	Day	7% 4 1 3 2 3 3 3 5% 7% 63%	4600
	11th to 20th	Day	7% 5% 1 4 3 3 3 2 5% 6% 62%	4902
	21st to end	Day	3 4 1 5% 3 3 4 3 5% 7% 60%	5814
April	1st to 10th	Day	5% 4 1 3 3 2 3 2 5% 6% 65%	2520
	11th to 20th	Day	8% 5% 1 4 3 3 3 3 4 6% 60%	2491
	21st to end	Day	6% 3 1 4 3 3 3 4 5% 6% 63%	2535
May	1st to 10th	Day	12% 4 2 4 2 2 3 3 5% 6% 57%	7655
	11th to 20th	Day	8% 3 1 3 2 2 2 2 3 5% 69%	7627
	21st to end	Day	12% 5% 2 5% 3 3 4 3 5% 6% 53%	8404
June	1st to 10th	Day	6% 4 2 4 4 4 5% 4 5% 9% 53%	2730
	11th to 20th	Day	4 3 1 3 3 2 4 4 5% 7% 64%	2730
	21st to end	Day	3 3 1 3 3 4 4 4 6% 8% 59%	2925
July	1st to 10th	Day	8% 4 2 6% 4 5% 5% 4 6% 8% 48%	8101
	11th to 20th	Day	3 2 1 3 3 4 4 4 6% 9% 60%	7680
	21st to end	Day	2 2 1 4 3 3 4 3 6% 9% 63%	8339
August	1st to 10th	Day	3 2 1 3 3 3 4 3 5% 8% 65%	7055
	11th to 20th	Day	3 2 1 4 3 3 4 3 7% 9% 61%	7003
	21st to end	Day	6% 3 1 4 3 3 4 3 5% 8% 59%	7751
September	1st to 10th	Day	7% 4 1 4 4 3 4 3 5% 7% 57%	2492
	11th to 20th	Day	8% 4 1 4 4 4 4 3 6% 7% 55%	2233
	21st to end	Day	7% 3 2 3 2 3 3 2 4 6% 65%	2200
October	1st to 10th	Day	5% 3 1 2 2 2 2 1 2 4 76%	3590
	11th to 20th	Day	12% 3 1 4 2 2 3 2 3 5% 63%	3553
	21st to end	Day	4 3 1 3 2 2 2 3 3 3 75%	3232
November	1st to 10th	Day	5% 4 1 3 2 2 2 2 4 7% 70%	1853
	11th to 20th	Day	3 3 1 3 2 2 2 3 4 6% 72%	1890
	21st to end	Day	9% 4 2 4 2 2 2 2 4 6% 63%	1890
December	1st to 10th	Day	4 3 1 3 2 3 3 3 4 6% 68%	3030
	11th to 20th	Day	4 3 1 3 3 4 4 4 5% 5% 66%	3481
	21st to end	Day	5% 7% 2 4 2 3 3 2 3 4 64%	4587
January	1st to 10th	Night	5% 7% 2 5% 3 3 4 4 5% 6% 56%	7634
	11th to 20th	Night	2 2 1 3 2 2 3 2 4 5% 73%	7680
	21st to end	Night	6% 7% 3 6% 4 3 3 3 4 5% 55%	7764
February	1st to 10th	Night	5% 6% 1 5% 3 3 3 2 4 5% 63%	2520
	11th to 20th	Night	5% 6% 2 4 4 3 4 3 4 6% 58%	2458
	21st to end	Night	4 4 1 4 3 3 3 3 5% 6% 63%	2076
March	1st to 10th	Night	4 5% 2 4 2 3 3 3 3 6% 66%	5494
	11th to 20th	Night	5% 3 1 4 3 3 3 3 3 6% 66%	5284
	21st to end	Night	3 4 2 4 3 3 4 4 5% 7% 62%	5364
April	1st to 10th	Night	6% 3 1 3 2 3 2 3 5% 7% 64%	2100
	11th to 20th	Night	8% 4 1 4 2 2 3 3 5% 6% 62%	2077
	21st to end	Night	8% 3 1 3 3 3 3 4 4 7% 62%	2084
May	1st to 10th	Night	12% 4 1 4 3 3 3 3 4 6% 58%	5292
	11th to 20th	Night	6% 3 1 3 2 3 3 2 4 6% 67%	5265
	21st to end	Night	12% 6% 2 4 3 3 3 3 5% 7% 52%	5803
June	1st to 10th	Night	5% 3 2 3 3 4 4 4 7% 12% 54%	1890
	11th to 20th	Night	3 2 1 3 3 3 3 3 7% 9% 62%	1890
	21st to end	Night	4 4 1 4 3 3 3 4 7% 11% 57%	1681
July	1st to 10th	Night	7% 4 2 6% 4 5% 6% 5% 8% 9% 44%	4854
	11th to 20th	Night	3 2 1 5% 4 4 5% 5% 8% 11% 53%	5310
	21st to end	Night	2 2 1 3 3 4 4 4 6% 11% 59%	5770
August	1st to 10th	Night	3 2 1 3 2 3 4 4 8% 12% 60%	5749
	11th to 20th	Night	3 2 1 4 4 4 5% 5% 7% 12% 52%	5853
	21st to end	Night	6% 4 1 4 3 4 4 4 7% 11% 53%	6465
September	1st to 10th	Night	6% 4 2 4 3 3 4 4 6% 7% 56%	2126
	11th to 20th	Night	8% 4 1 5% 4 3 4 3 5% 7% 55%	2233
	21st to end	Night	6% 3 1 3 2 3 3 3 5% 6% 66%	2200
October	1st to 10th	Night	5% 2 1 3 2 2 2 2 3 4 77%	3590
	11th to 20th	Night	10% 3 1 3 2 2 3 2 3 4 66%	3570
	21st to end	Night	4 2 1 2 2 2 2 2 4 6% 72%	4536
November	1st to 10th	Night	5% 2 1 2 2 2 2 2 4 6% 71%	2665
	11th to 20th	Night	3 3 1 2 2 2 3 2 4 6% 72%	2730
	21st to end	Night	7% 4 1 3 2 3 3 2 5% 6% 64%	2730
December	1st to 10th	Night	4 3 1 2 2 2 3 3 4 7% 68%	4380
	11th to 20th	Night	3 3 1 3 2 3 3 3 5% 7% 68%	4946
	21st to end	Night	5% 5% 2 4 3 3 3 3 5% 6% 63%	6633

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	32% 2 4 22% 27% 12%	5290
	11th to 20th	Day	17% 2 6% 18% 37% 20%	5347
	21st to end	Day	29% 3 5% 17% 34% 12%	6468
February	1st to 10th	Day	23% 2 8% 22% 28% 16%	2100
	11th to 20th	Day	28% 3 6% 22% 27% 15%	2059
	21st to end	Day	22% 2 4 19% 32% 22%	1730
March	1st to 10th	Day	22% 3 3 12% 28% 32%	4600
	11th to 20th	Day	24% 3 5% 16% 31% 22%	4902
	21st to end	Day	23% 3 7% 26% 29% 12%	5814
April	1st to 10th	Day	22% 3 6% 16% 30% 23%	2520
	11th to 20th	Day	26% 4 6% 19% 25% 21%	2494
	21st to end	Day	21% 4 10% 23% 29% 13%	2535
May	1st to 10th	Day	28% 4 8% 21% 24% 15%	7655
	11th to 20th	Day	20% 3 5% 16% 26% 30%	7631
	21st to end	Day	33% 4 10% 16% 16% 20%	8405
June	1st to 10th	Day	27% 7% 13% 28% 16% 10%	2730
	11th to 20th	Day	20% 5% 9% 24% 26% 16%	2730
	21st to end	Day	22% 5% 12% 28% 22% 11%	2925
July	1st to 10th	Day	34% 5% 9% 23% 25% 4	8035
	11th to 20th	Day	20% 5% 15% 32% 23% 6%	7611
	21st to end	Day	16% 6% 15% 33% 26% 4	8155
August	1st to 10th	Day	16% 5% 10% 26% 30% 13%	5585
	11th to 20th	Day	17% 5% 9% 27% 33% 10%	5519
	21st to end	Day	20% 5% 10% 28% 30% 6%	6078
September	1st to 10th	Day	26% 6% 10% 23% 24% 11%	2492
	11th to 20th	Day	28% 5% 9% 22% 29% 7%	2233
	21st to end	Day	21% 3 7% 22% 33% 14%	2200
October	1st to 10th	Day	16% 2 5% 14% 38% 26%	3590
	11th to 20th	Day	26% 3 6% 19% 25% 21%	3553
	21st to end	Day	16% 2 3 23% 37% 19%	3232
November	1st to 10th	Day	17% 3 6% 18% 37% 20%	1853
	11th to 20th	Day	16% 3 5% 25% 34% 18%	1890
	21st to end	Day	25% 2 5% 17% 32% 19%	1890
December	1st to 10th	Day	19% 3 6% 31% 29% 12%	3030
	11th to 20th	Day	21% 3 4 17% 38% 17%	3479
	21st to end	Day	25% 3 5% 22% 31% 14%	4587
January	1st to 10th	Night	28% 3 4 28% 30% 7%	7635
	11th to 20th	Night	15% 3 8% 19% 37% 18%	7680
	21st to end	Night	30% 4 6% 17% 30% 12%	7764
February	1st to 10th	Night	25% 2 6% 18% 31% 18%	2520
	11th to 20th	Night	28% 3 7% 21% 25% 17%	2458
	21st to end	Night	21% 3 4 17% 32% 24%	2076
March	1st to 10th	Night	21% 3 3 13% 24% 35%	5494
	11th to 20th	Night	20% 3 5% 18% 20% 34%	5284
	21st to end	Night	21% 4 7% 22% 29% 16%	5364
April	1st to 10th	Night	20% 4 7% 20% 26% 22%	2100
	11th to 20th	Night	23% 5% 8% 20% 25% 19%	2077
	21st to end	Night	23% 4 11% 23% 24% 14%	2084
May	1st to 10th	Night	28% 4 9% 22% 22% 14%	5293
	11th to 20th	Night	19% 5% 6% 14% 28% 28%	5266
	21st to end	Night	33% 5% 13% 12% 12% 24%	5805
June	1st to 10th	Night	23% 8% 19% 26% 16% 8%	1890
	11th to 20th	Night	18% 7% 12% 23% 24% 16%	1890
	21st to end	Night	20% 5% 14% 28% 21% 12%	1681
July	1st to 10th	Night	34% 6% 13% 28% 17% 2	4812
	11th to 20th	Night	23% 6% 18% 25% 22% 5%	5256
	21st to end	Night	19% 5% 12% 31% 29% 4	5641
August	1st to 10th	Night	16% 5% 11% 30% 26% 11%	4543
	11th to 20th	Night	21% 5% 10% 27% 28% 9%	4613
	21st to end	Night	21% 5% 13% 28% 26% 7%	5069
September	1st to 10th	Night	26% 6% 11% 23% 23% 11%	2126
	11th to 20th	Night	27% 6% 9% 24% 26% 8%	2233
	21st to end	Night	19% 4 8% 21% 33% 16%	2200
October	1st to 10th	Night	15% 3 6% 11% 34% 31%	3590
	11th to 20th	Night	23% 3 7% 17% 30% 21%	3570
	21st to end	Night	15% 2 5% 19% 41% 17%	4536
November	1st to 10th	Night	16% 3 7% 20% 33% 21%	2665
	11th to 20th	Night	15% 3 5% 22% 36% 18%	2730
	21st to end	Night	23% 3 4 18% 32% 19%	2730
December	1st to 10th	Night	17% 4 6% 31% 33% 9%	4380
	11th to 20th	Night	18% 3 3 16% 40% 19%	4947
	21st to end	Night	23% 3 7% 21% 32% 13%	6633

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	9% 10% 41% 29% 9% 1	330
	11th to 20th	Day	10% 20% 31% 25% 14%	330
	21st to end	Day	12% 8% 42% 26% 11% 1	363
February	1st to 10th	Day	9% 9% 40% 32% 10%	330
	11th to 20th	Day	11% 16% 38% 25% 7% 2	330
	21st to end	Day	8% 18% 42% 25% 7%	273
March	1st to 10th	Day	8% 11% 45% 28% 8%	330
	11th to 20th	Day	15% 14% 39% 20% 9% 2	330
	21st to end	Day	10% 14% 44% 23% 8% 1	463
April	1st to 10th	Day	8% 14% 48% 22% 7%	540
	11th to 20th	Day	11% 19% 45% 20% 4 1	532
	21st to end	Day	9% 18% 36% 28% 8% 1	555
May	1st to 10th	Day	9% 10% 38% 32% 10% 1	753
	11th to 20th	Day	11% 8% 31% 30% 17% 3	775
	21st to end	Day	9% 9% 34% 31% 15% 2	844
June	1st to 10th	Day	8% 4 24% 38% 22% 3	780
	11th to 20th	Day	5% 4 30% 39% 18% 3	780
	21st to end	Day	4 2 24% 41% 25% 4	780
July	1st to 10th	Day	6% 2 15% 36% 30% 11%	771
	11th to 20th	Day	3 1 8% 40% 39% 9%	768
	21st to end	Day	2 1 7% 35% 42% 12%	849
August	1st to 10th	Day	2 1 13% 43% 34% 7%	595
	11th to 20th	Day	5% 2 12% 39% 29% 13%	557
	21st to end	Day	6% 2 11% 40% 31% 10%	627
September	1st to 10th	Day	7% 1 13% 42% 29% 9%	542
	11th to 20th	Day	3 2 17% 42% 28% 9%	339
	21st to end	Day	10% 3 18% 35% 27% 7%	330
October	1st to 10th	Day	10% 3 26% 32% 23% 6%	330
	11th to 20th	Day	8% 7% 27% 38% 16% 4	330
	21st to end	Day	18% 7% 28% 25% 19% 4	363
November	1st to 10th	Day	10% 8% 34% 30% 15% 2	330
	11th to 20th	Day	7% 9% 32% 37% 12% 4	330
	21st to end	Day	16% 13% 31% 27% 10% 3	330
December	1st to 10th	Day	6% 12% 40% 28% 11% 2	330
	11th to 20th	Day	5% 10% 39% 35% 10% 1	330
	21st to end	Day	12% 14% 38% 26% 9% 1	363
January	1st to 10th	Night	7% 11% 35% 40% 7%	1050
	11th to 20th	Night	7% 10% 36% 36% 10%	1050
	21st to end	Night	7% 7% 39% 39% 8% 1	929
February	1st to 10th	Night	8% 11% 38% 36% 6% 1	840
	11th to 20th	Night	10% 12% 41% 31% 5%	824
	21st to end	Night	7% 12% 46% 33% 3	692
March	1st to 10th	Night	8% 14% 39% 35% 4	840
	11th to 20th	Night	11% 13% 36% 34% 6%	720
	21st to end	Night	6% 15% 48% 28% 3	693
April	1st to 10th	Night	8% 13% 44% 31% 4	630
	11th to 20th	Night	9% 12% 51% 26% 2	623
	21st to end	Night	9% 13% 42% 32% 5%	630
May	1st to 10th	Night	8% 11% 39% 37% 5%	630
	11th to 20th	Night	8% 8% 34% 38% 11% 1	621
	21st to end	Night	9% 6% 40% 36% 9%	683
June	1st to 10th	Night	5% 5% 34% 44% 13%	630
	11th to 20th	Night	4 4 40% 43% 9%	630
	21st to end	Night	3 3 30% 45% 18% 1	630
July	1st to 10th	Night	7% 2 15% 47% 28% 1	615
	11th to 20th	Night	3 1 11% 51% 33% 1	612
	21st to end	Night	3 9% 49% 38% 1	690
August	1st to 10th	Night	3 15% 48% 34% 1	627
	11th to 20th	Night	6% 1 13% 45% 34%	624
	21st to end	Night	4 1 12% 45% 36% 2	693
September	1st to 10th	Night	7% 1 12% 46% 32% 2	630
	11th to 20th	Night	9% 2 19% 48% 22%	609
	21st to end	Night	7% 3 20% 45% 23% 2	600
October	1st to 10th	Night	9% 3 26% 46% 15% 1	600
	11th to 20th	Night	10% 6% 32% 42% 10% 1	600
	21st to end	Night	8% 9% 29% 35% 19% 1	1050
November	1st to 10th	Night	6% 7% 32% 40% 15% 1	1025
	11th to 20th	Night	4 9% 35% 37% 14%	1050
	21st to end	Night	9% 9% 31% 38% 13%	1050
December	1st to 10th	Night	8% 8% 33% 41% 9% 1	1050
	11th to 20th	Night	8% 10% 38% 36% 8%	1050
	21st to end	Night	10% 10% 38% 36% 7% 1	1155

Page generated at 2026-09-11 03:11:51. Version ac07

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