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 2025-05-11.

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% 6% 62%	118684
	Night	5% 4 1 4 3 3 3 3 5% 7% 62%	119060
Transparency	Day	23% 4 7% 22% 28% 16%	118445
	Night	22% 4 8% 21% 28% 17%	118889
Seeing	Day	8% 7% 28% 33% 20% 5%	15895
	Night	7% 8% 32% 39% 14% 1	25969

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	7% 7% 3 6% 4 4 3 2 3 4 56%	4077
	11th to 20th	Day	3 4 1 3 2 3 3 2 3 5% 71%	4103
	21st to end	Day	7% 4 2 5% 4 4 3 2 4 6% 59%	4994
February	1st to 10th	Day	5% 5% 2 5% 3 2 3 3 5% 6% 62%	2000
	11th to 20th	Day	5% 7% 3 5% 3 3 3 3 4 6% 59%	1949
	21st to end	Day	3 7% 2 3 3 3 3 3 4 6% 64%	1650
March	1st to 10th	Day	7% 4 1 3 2 3 3 2 4 6% 63%	4500
	11th to 20th	Day	7% 5% 1 4 3 3 3 2 5% 6% 61%	4796
	21st to end	Day	3 4 2 5% 4 3 4 3 6% 7% 60%	5688
April	1st to 10th	Day	5% 4 1 3 3 2 3 2 5% 6% 66%	2400
	11th to 20th	Day	8% 5% 1 4 3 3 3 3 4 6% 60%	2371
	21st to end	Day	6% 3 1 3 3 3 3 4 5% 6% 63%	2414
May	1st to 10th	Day	8% 4 1 4 3 2 3 3 5% 6% 61%	4250
	11th to 20th	Day	10% 5% 1 4 3 3 3 3 4 6% 58%	4083
	21st to end	Day	7% 4 1 4 3 2 3 3 4 6% 62%	4489
June	1st to 10th	Day	6% 3 2 4 4 4 5% 4 5% 9% 53%	2470
	11th to 20th	Day	4 4 1 3 3 2 4 4 5% 7% 63%	2470
	21st to end	Day	3 3 1 3 3 4 4 4 6% 8% 60%	2646
July	1st to 10th	Day	8% 4 2 6% 4 4 4 3 7% 9% 49%	4347
	11th to 20th	Day	3 2 1 3 3 4 4 4 6% 9% 60%	4120
	21st to end	Day	3 3 1 4 3 4 5% 4 6% 9% 58%	4466
August	1st to 10th	Day	3 2 1 4 4 3 4 3 6% 10% 61%	3823
	11th to 20th	Day	3 2 1 3 3 3 3 3 6% 8% 63%	3726
	21st to end	Day	5% 4 1 3 3 3 4 3 6% 8% 60%	4180
September	1st to 10th	Day	7% 4 1 4 4 3 4 3 6% 7% 57%	2255
	11th to 20th	Day	8% 4 1 5% 4 4 4 3 5% 7% 55%	2090
	21st to end	Day	7% 3 2 3 2 3 3 2 4 5% 66%	2090
October	1st to 10th	Day	5% 3 1 2 2 2 1 1 2 4 76%	3480
	11th to 20th	Day	12% 3 1 3 2 2 3 2 3 5% 63%	3443
	21st to end	Day	4 3 1 3 1 2 2 3 3 3 75%	3132
November	1st to 10th	Day	5% 4 1 3 2 2 2 2 4 7% 69%	1763
	11th to 20th	Day	3 3 1 3 3 2 2 3 4 6% 72%	1800
	21st to end	Day	9% 4 2 4 2 2 2 2 4 6% 63%	1800
December	1st to 10th	Day	4 3 1 3 2 3 3 3 4 6% 68%	2940
	11th to 20th	Day	4 3 1 3 3 4 4 4 5% 5% 65%	3391
	21st to end	Day	5% 7% 2 4 2 3 3 2 3 4 64%	4488
January	1st to 10th	Night	6% 8% 2 5% 3 3 3 3 4 5% 58%	5888
	11th to 20th	Night	2 3 2 4 2 3 3 2 4 6% 68%	5900
	21st to end	Night	4 7% 3 6% 4 3 3 3 4 6% 57%	6002
February	1st to 10th	Night	6% 6% 2 5% 3 3 3 2 4 5% 62%	2400
	11th to 20th	Night	6% 7% 2 5% 4 3 4 3 4 6% 58%	2338
	21st to end	Night	5% 4 1 4 3 3 3 3 6% 6% 62%	1980
March	1st to 10th	Night	4 5% 2 4 2 3 3 3 3 6% 66%	5374
	11th to 20th	Night	5% 3 1 4 3 3 3 3 3 6% 66%	5170
	21st to end	Night	3 4 2 4 3 3 4 4 5% 7% 61%	5248
April	1st to 10th	Night	6% 4 1 3 2 3 2 3 5% 7% 64%	2000
	11th to 20th	Night	8% 4 1 3 2 3 3 3 5% 6% 62%	1977
	21st to end	Night	8% 3 1 3 3 3 3 4 4 7% 62%	1985
May	1st to 10th	Night	10% 6% 2 4 2 3 2 2 4 5% 61%	2940
	11th to 20th	Night	9% 5% 2 5% 3 3 4 3 5% 7% 54%	2828
	21st to end	Night	8% 5% 2 3 3 2 3 2 4 6% 62%	3098
June	1st to 10th	Night	5% 3 2 3 3 4 4 4 6% 12% 54%	1710
	11th to 20th	Night	3 2 1 3 3 3 3 4 8% 9% 62%	1710
	21st to end	Night	3 3 1 3 3 3 3 4 8% 11% 59%	1521
July	1st to 10th	Night	7% 4 1 5% 3 4 4 4 7% 8% 52%	2602
	11th to 20th	Night	4 3 2 5% 4 4 5% 5% 7% 9% 53%	2850
	21st to end	Night	3 3 1 2 3 3 4 4 6% 12% 58%	3097
August	1st to 10th	Night	2 2 1 3 2 3 5% 5% 9% 12% 56%	3112
	11th to 20th	Night	4 3 1 4 4 4 5% 4 6% 11% 54%	3113
	21st to end	Night	5% 3 1 4 3 4 3 3 7% 11% 57%	3487
September	1st to 10th	Night	6% 4 2 5% 3 3 4 4 5% 7% 57%	1924
	11th to 20th	Night	8% 5% 1 5% 4 3 4 3 5% 8% 54%	2090
	21st to end	Night	6% 3 1 2 2 3 3 3 5% 6% 67%	2090
October	1st to 10th	Night	5% 3 1 2 2 1 2 1 2 4 77%	3480
	11th to 20th	Night	10% 3 1 3 2 2 3 2 3 4 66%	3460
	21st to end	Night	4 2 1 2 2 2 2 2 4 6% 72%	4395
November	1st to 10th	Night	6% 2 1 2 2 2 2 2 4 6% 71%	2535
	11th to 20th	Night	3 4 1 3 2 2 3 2 4 6% 72%	2600
	21st to end	Night	7% 4 1 4 2 3 3 2 5% 6% 63%	2600
December	1st to 10th	Night	4 3 1 3 2 2 3 3 4 7% 68%	4250
	11th to 20th	Night	3 3 1 3 2 2 3 3 5% 7% 67%	4816
	21st to end	Night	5% 5% 2 4 3 3 3 3 5% 6% 62%	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	33% 3 5% 24% 26% 9%	4078
	11th to 20th	Day	18% 3 5% 21% 34% 19%	4103
	21st to end	Day	27% 4 5% 20% 32% 13%	4994
February	1st to 10th	Day	24% 2 8% 23% 27% 16%	2000
	11th to 20th	Day	28% 3 6% 23% 26% 15%	1959
	21st to end	Day	23% 2 4 18% 32% 21%	1650
March	1st to 10th	Day	23% 3 3 11% 28% 32%	4500
	11th to 20th	Day	25% 3 5% 15% 31% 22%	4796
	21st to end	Day	23% 3 7% 26% 29% 11%	5688
April	1st to 10th	Day	21% 3 6% 16% 30% 24%	2400
	11th to 20th	Day	26% 4 6% 19% 25% 20%	2374
	21st to end	Day	22% 4 10% 23% 29% 12%	2414
May	1st to 10th	Day	24% 5% 8% 19% 21% 23%	4250
	11th to 20th	Day	27% 5% 8% 21% 23% 16%	4087
	21st to end	Day	23% 5% 9% 16% 22% 25%	4489
June	1st to 10th	Day	26% 8% 12% 28% 16% 10%	2470
	11th to 20th	Day	20% 5% 9% 23% 27% 17%	2470
	21st to end	Day	20% 6% 12% 28% 22% 12%	2646
July	1st to 10th	Day	31% 6% 11% 25% 22% 5%	4280
	11th to 20th	Day	20% 5% 11% 31% 26% 7%	4051
	21st to end	Day	19% 7% 12% 30% 26% 6%	4325
August	1st to 10th	Day	19% 5% 13% 28% 23% 12%	3810
	11th to 20th	Day	19% 5% 9% 22% 32% 13%	3762
	21st to end	Day	22% 5% 11% 28% 28% 6%	4179
September	1st to 10th	Day	27% 6% 11% 22% 23% 12%	2255
	11th to 20th	Day	29% 5% 9% 20% 29% 7%	2090
	21st to end	Day	21% 3 7% 22% 32% 14%	2090
October	1st to 10th	Day	16% 2 5% 13% 38% 26%	3480
	11th to 20th	Day	26% 3 6% 19% 26% 21%	3443
	21st to end	Day	15% 2 3 23% 37% 19%	3132
November	1st to 10th	Day	17% 3 6% 17% 36% 21%	1763
	11th to 20th	Day	16% 3 6% 26% 33% 17%	1800
	21st to end	Day	25% 2 5% 16% 32% 20%	1800
December	1st to 10th	Day	19% 3 6% 32% 29% 12%	2940
	11th to 20th	Day	22% 3 4 17% 38% 16%	3389
	21st to end	Day	25% 3 5% 22% 31% 13%	4488
January	1st to 10th	Night	29% 2 5% 30% 27% 6%	5888
	11th to 20th	Night	18% 4 9% 18% 35% 17%	5900
	21st to end	Night	28% 5% 7% 18% 31% 12%	6002
February	1st to 10th	Night	26% 2 6% 17% 30% 18%	2400
	11th to 20th	Night	29% 3 7% 20% 24% 17%	2338
	21st to end	Night	22% 3 4 17% 30% 24%	1980
March	1st to 10th	Night	21% 3 3 13% 25% 35%	5374
	11th to 20th	Night	21% 3 5% 18% 19% 34%	5170
	21st to end	Night	22% 4 7% 22% 29% 15%	5248
April	1st to 10th	Night	20% 4 7% 20% 26% 23%	2000
	11th to 20th	Night	23% 5% 8% 20% 24% 19%	1977
	21st to end	Night	23% 4 12% 23% 24% 14%	1985
May	1st to 10th	Night	26% 5% 8% 19% 18% 24%	2940
	11th to 20th	Night	28% 8% 10% 17% 22% 15%	2829
	21st to end	Night	24% 5% 10% 12% 17% 31%	3099
June	1st to 10th	Night	23% 8% 17% 26% 16% 9%	1710
	11th to 20th	Night	17% 8% 12% 22% 25% 17%	1710
	21st to end	Night	18% 5% 14% 29% 22% 12%	1521
July	1st to 10th	Night	28% 6% 14% 31% 18% 3	2560
	11th to 20th	Night	26% 6% 12% 21% 28% 7%	2796
	21st to end	Night	18% 5% 12% 29% 30% 6%	2999
August	1st to 10th	Night	19% 6% 13% 27% 22% 13%	3102
	11th to 20th	Night	23% 6% 12% 22% 26% 10%	3143
	21st to end	Night	21% 5% 13% 30% 24% 7%	3487
September	1st to 10th	Night	26% 7% 10% 22% 24% 12%	1924
	11th to 20th	Night	28% 6% 9% 22% 26% 8%	2090
	21st to end	Night	18% 4 7% 21% 33% 16%	2090
October	1st to 10th	Night	14% 3 6% 11% 34% 32%	3480
	11th to 20th	Night	23% 3 7% 16% 30% 21%	3460
	21st to end	Night	15% 2 4 19% 42% 18%	4395
November	1st to 10th	Night	17% 3 7% 20% 33% 21%	2535
	11th to 20th	Night	15% 3 5% 23% 35% 18%	2600
	21st to end	Night	24% 3 4 17% 33% 20%	2600
December	1st to 10th	Night	17% 4 6% 31% 33% 9%	4250
	11th to 20th	Night	18% 3 4 16% 40% 19%	4817
	21st to end	Night	24% 3 7% 21% 33% 13%	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	9% 10% 41% 30% 10% 1	300
	11th to 20th	Day	10% 20% 32% 25% 13%	300
	21st to end	Day	10% 8% 42% 27% 12% 1	330
February	1st to 10th	Day	9% 9% 40% 32% 9%	300
	11th to 20th	Day	10% 16% 40% 25% 7% 2	300
	21st to end	Day	9% 18% 42% 24% 7%	249
March	1st to 10th	Day	8% 9% 45% 29% 8%	300
	11th to 20th	Day	16% 14% 39% 19% 10% 2	300
	21st to end	Day	10% 15% 44% 23% 8% 1	425
April	1st to 10th	Day	9% 15% 48% 22% 7%	500
	11th to 20th	Day	12% 16% 46% 21% 5% 1	492
	21st to end	Day	9% 17% 35% 28% 9% 1	514
May	1st to 10th	Day	9% 9% 38% 34% 10% 1	703
	11th to 20th	Day	11% 7% 30% 32% 17% 3	676
	21st to end	Day	9% 8% 34% 32% 16% 2	734
June	1st to 10th	Day	7% 4 23% 39% 24% 4	680
	11th to 20th	Day	5% 4 30% 40% 19% 3	680
	21st to end	Day	4 2 20% 42% 28% 5%	680
July	1st to 10th	Day	6% 1 13% 36% 32% 13%	671
	11th to 20th	Day	3 8% 38% 40% 10%	668
	21st to end	Day	2 1 6% 34% 43% 13%	739
August	1st to 10th	Day	3 1 11% 41% 38% 8%	513
	11th to 20th	Day	6% 1 11% 36% 30% 15%	477
	21st to end	Day	6% 2 11% 38% 33% 10%	539
September	1st to 10th	Day	7% 10% 43% 30% 10%	465
	11th to 20th	Day	4 2 13% 42% 30% 9%	300
	21st to end	Day	10% 2 18% 33% 28% 8%	300
October	1st to 10th	Day	11% 3 25% 32% 23% 6%	300
	11th to 20th	Day	7% 6% 25% 41% 17% 4	300
	21st to end	Day	18% 7% 28% 26% 18% 4	330
November	1st to 10th	Day	11% 8% 32% 31% 16% 3	300
	11th to 20th	Day	7% 9% 34% 35% 11% 4	300
	21st to end	Day	16% 12% 30% 28% 11% 3	300
December	1st to 10th	Day	6% 12% 39% 29% 12% 2	300
	11th to 20th	Day	5% 10% 40% 34% 10% 1	300
	21st to end	Day	12% 15% 39% 24% 8% 1	330
January	1st to 10th	Night	7% 10% 35% 41% 7%	1000
	11th to 20th	Night	8% 10% 36% 36% 10%	1000
	21st to end	Night	6% 7% 39% 40% 8% 1	885
February	1st to 10th	Night	8% 11% 39% 35% 6% 1	800
	11th to 20th	Night	10% 12% 42% 32% 5%	784
	21st to end	Night	7% 12% 45% 33% 3	660
March	1st to 10th	Night	8% 13% 40% 35% 4	800
	11th to 20th	Night	11% 13% 37% 33% 6%	686
	21st to end	Night	6% 14% 48% 28% 3	660
April	1st to 10th	Night	8% 13% 45% 30% 4	600
	11th to 20th	Night	9% 11% 51% 26% 2	593
	21st to end	Night	9% 12% 42% 32% 5%	600
May	1st to 10th	Night	8% 10% 40% 36% 5%	600
	11th to 20th	Night	8% 7% 33% 39% 12% 1	563
	21st to end	Night	9% 6% 41% 35% 8%	617
June	1st to 10th	Night	5% 4 33% 44% 14%	570
	11th to 20th	Night	4 3 40% 44% 9%	570
	21st to end	Night	3 2 29% 47% 18% 1	570
July	1st to 10th	Night	6% 2 13% 47% 30% 1	555
	11th to 20th	Night	3 1 11% 50% 34% 1	552
	21st to end	Night	3 8% 48% 39% 1	624
August	1st to 10th	Night	3 13% 47% 36% 1	567
	11th to 20th	Night	6% 1 12% 46% 34% 1	564
	21st to end	Night	4 1 11% 45% 37% 2	627
September	1st to 10th	Night	7% 1 11% 46% 33% 2	570
	11th to 20th	Night	9% 2 19% 47% 22% 1	570
	21st to end	Night	7% 3 20% 44% 24% 2	570
October	1st to 10th	Night	9% 3 26% 45% 15% 1	570
	11th to 20th	Night	10% 6% 31% 42% 11% 1	570
	21st to end	Night	8% 9% 29% 34% 19% 1	997
November	1st to 10th	Night	7% 7% 31% 40% 15% 1	975
	11th to 20th	Night	4 10% 35% 37% 14% 1	1000
	21st to end	Night	9% 8% 31% 38% 13%	1000
December	1st to 10th	Night	8% 8% 33% 41% 9% 1	1000
	11th to 20th	Night	9% 10% 39% 34% 8%	1000
	21st to end	Night	10% 10% 38% 34% 7% 1	1100

Page generated at 2025-05-08 08:33:58. Version ac07

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