Capitol Reef National Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Capitol Reef National Park clear sky chart from 2005-11-06 to 2025-06-10.

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	2 3 1 4 3 4 4 4 6% 8% 60%	124090
	Night	2 3 1 3 3 3 3 3 5% 7% 66%	123121
Transparency	Day	20% 7% 12% 21% 25% 16%	123857
	Night	17% 6% 11% 23% 27% 16%	122941
Seeing	Day	6% 12% 29% 31% 18% 5%	15506
	Night	3 5% 27% 38% 22% 4	25678

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	1 3 2 5% 3 3 4 4 6% 8% 60%	4098
	11th to 20th	Day	3 1 3 2 2 2 3 5% 7% 71%	4100
	21st to end	Day	1 6% 2 4 2 3 3 3 5% 6% 63%	4510
February	1st to 10th	Day	1 4 1 4 3 3 4 4 8% 10% 59%	1800
	11th to 20th	Day	1 5% 2 4 3 4 3 4 6% 9% 58%	1844
	21st to end	Day	1 4 2 4 3 3 4 3 6% 7% 62%	1650
March	1st to 10th	Day	1 4 2 5% 4 4 4 3 5% 6% 62%	4949
	11th to 20th	Day	5% 8% 2 5% 4 4 5% 4 6% 7% 49%	5000
	21st to end	Day	1 4 2 6% 5% 5% 6% 5% 7% 9% 50%	5486
April	1st to 10th	Day	2 4 1 4 3 3 4 3 6% 9% 62%	2220
	11th to 20th	Day	2 5% 1 4 4 4 4 4 7% 7% 58%	2423
	21st to end	Day	3 3 1 3 4 3 5% 4 6% 8% 60%	2600
May	1st to 10th	Day	3 3 1 4 4 4 4 3 5% 7% 62%	5880
	11th to 20th	Day	3 4 2 5% 4 5% 5% 4 7% 8% 54%	5841
	21st to end	Day	2 3 1 4 3 4 4 4 6% 9% 60%	6423
June	1st to 10th	Day	2 3 1 4 3 3 5% 5% 6% 8% 61%	2589
	11th to 20th	Day	2 2 1 3 3 3 4 3 5% 5% 69%	2470
	21st to end	Day	2 2 1 3 3 4 5% 3 5% 6% 65%	2470
July	1st to 10th	Day	3 2 1 3 3 3 4 3 4 5% 71%	4110
	11th to 20th	Day	3 3 1 5% 6% 7% 8% 8% 10% 9% 40%	4110
	21st to end	Day	3 3 1 4 4 4 6% 6% 8% 9% 52%	4454
August	1st to 10th	Day	2 3 1 5% 5% 6% 8% 7% 9% 10% 43%	4092
	11th to 20th	Day	2 2 1 4 5% 7% 7% 6% 7% 8% 51%	4028
	21st to end	Day	2 2 1 4 3 4 5% 4 7% 8% 58%	4379
September	1st to 10th	Day	4 3 1 4 4 5% 5% 4 6% 6% 59%	2150
	11th to 20th	Day	4 2 1 4 3 3 4 3 4 5% 66%	2090
	21st to end	Day	3 2 1 2 2 2 3 2 4 6% 72%	2090
October	1st to 10th	Day	3 2 1 3 3 2 2 2 4 5% 73%	3308
	11th to 20th	Day	6% 4 1 3 2 3 3 3 4 8% 62%	3150
	21st to end	Day	2 2 1 2 2 2 3 3 4 4 74%	3438
November	1st to 10th	Day	1 3 1 2 1 2 2 2 3 7% 74%	1869
	11th to 20th	Day	1 2 1 2 2 2 2 2 4 7% 76%	1800
	21st to end	Day	2 2 1 3 2 2 3 3 5% 7% 70%	1800
December	1st to 10th	Day	1 2 1 3 2 3 3 3 6% 8% 69%	2950
	11th to 20th	Day	1 2 1 4 3 3 3 3 6% 10% 64%	3409
	21st to end	Day	1 4 2 5% 4 4 5% 4 7% 9% 56%	4510
January	1st to 10th	Night	1 4 1 5% 3 4 4 3 4 5% 65%	5867
	11th to 20th	Night	1 2 1 2 2 3 3 3 4 6% 74%	5880
	21st to end	Night	2 6% 2 4 3 4 4 3 5% 6% 61%	6468
February	1st to 10th	Night	1 4 1 3 3 3 4 4 5% 8% 65%	2600
	11th to 20th	Night	2 3 1 4 3 3 4 3 5% 7% 65%	2439
	21st to end	Night	1 4 1 3 3 3 4 4 6% 6% 64%	1980
March	1st to 10th	Night	1 4 2 5% 4 4 5% 4 5% 7% 60%	4945
	11th to 20th	Night	5% 8% 3 6% 4 4 4 3 5% 7% 50%	5000
	21st to end	Night	1 3 2 5% 3 4 4 4 6% 8% 61%	5489
April	1st to 10th	Night	2 4 1 3 3 3 4 3 6% 7% 65%	2180
	11th to 20th	Night	2 4 1 4 3 3 4 3 5% 7% 64%	1922
	21st to end	Night	2 3 1 3 3 3 4 4 6% 8% 65%	1800
May	1st to 10th	Night	6% 4 2 5% 3 4 4 3 5% 5% 60%	4100
	11th to 20th	Night	2 4 1 3 2 2 3 3 5% 7% 66%	4074
	21st to end	Night	2 2 1 3 2 2 3 3 6% 8% 67%	4474
June	1st to 10th	Night	2 2 1 2 2 3 4 3 6% 7% 68%	1795
	11th to 20th	Night	2 2 1 2 2 3 3 3 4 7% 72%	1710
	21st to end	Night	2 2 1 3 2 3 3 3 5% 7% 70%	1710
July	1st to 10th	Night	1 1 2 2 2 3 3 4 6% 76%	2860
	11th to 20th	Night	1 2 1 5% 4 5% 6% 5% 9% 11% 50%	2860
	21st to end	Night	1 1 1 3 3 4 5% 5% 7% 10% 58%	3109
August	1st to 10th	Night	1 2 1 4 4 5% 5% 6% 9% 11% 52%	2847
	11th to 20th	Night	1 1 1 3 2 3 3 3 8% 9% 64%	2811
	21st to end	Night	1 2 1 3 3 3 3 3 5% 8% 68%	3287
September	1st to 10th	Night	3 3 1 3 2 3 4 4 5% 7% 67%	2026
	11th to 20th	Night	2 1 1 2 2 2 3 2 4 6% 75%	2090
	21st to end	Night	2 1 1 2 2 2 2 2 3 4 79%	2090
October	1st to 10th	Night	2 2 1 2 1 2 3 2 4 5% 76%	3666
	11th to 20th	Night	6% 2 1 3 3 3 3 3 5% 7% 65%	3778
	21st to end	Night	2 3 1 3 2 2 3 3 4 5% 73%	4120
November	1st to 10th	Night	1 3 1 2 2 3 3 3 5% 7% 71%	2425
	11th to 20th	Night	1 2 2 2 2 3 3 4 7% 75%	2600
	21st to end	Night	2 2 1 2 2 2 3 3 3 7% 71%	2600
December	1st to 10th	Night	1 2 1 3 2 2 2 3 4 6% 74%	4240
	11th to 20th	Night	1 2 1 3 2 3 3 2 5% 7% 70%	4811
	21st to end	Night	1 4 2 4 3 3 3 3 6% 8% 63%	6468

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	20% 9% 19% 30% 19% 3	4099
	11th to 20th	Day	14% 6% 11% 28% 29% 11%	4100
	21st to end	Day	20% 8% 12% 29% 28% 4	4510
February	1st to 10th	Day	20% 9% 20% 26% 20% 6%	1800
	11th to 20th	Day	21% 9% 15% 25% 25% 6%	1853
	21st to end	Day	20% 8% 10% 26% 27% 9%	1650
March	1st to 10th	Day	19% 6% 10% 21% 32% 12%	4949
	11th to 20th	Day	28% 8% 11% 24% 22% 7%	5000
	21st to end	Day	22% 11% 15% 27% 22% 2	5486
April	1st to 10th	Day	19% 7% 12% 24% 27% 11%	2220
	11th to 20th	Day	21% 7% 12% 23% 26% 11%	2426
	21st to end	Day	19% 7% 11% 22% 32% 9%	2600
May	1st to 10th	Day	19% 6% 13% 18% 33% 12%	5880
	11th to 20th	Day	21% 8% 11% 18% 27% 16%	5844
	21st to end	Day	15% 8% 9% 18% 37% 13%	6424
June	1st to 10th	Day	17% 6% 10% 17% 28% 23%	2589
	11th to 20th	Day	16% 5% 7% 9% 24% 39%	2470
	21st to end	Day	16% 6% 6% 12% 22% 39%	2470
July	1st to 10th	Day	14% 6% 5% 7% 8% 60%	4046
	11th to 20th	Day	28% 9% 10% 16% 16% 20%	4041
	21st to end	Day	23% 9% 12% 16% 13% 27%	4314
August	1st to 10th	Day	28% 9% 13% 21% 13% 16%	4078
	11th to 20th	Day	27% 7% 13% 13% 18% 22%	4067
	21st to end	Day	20% 6% 12% 14% 25% 23%	4378
September	1st to 10th	Day	22% 7% 9% 14% 21% 27%	2150
	11th to 20th	Day	17% 7% 10% 15% 22% 29%	2090
	21st to end	Day	13% 5% 7% 15% 33% 27%	2090
October	1st to 10th	Day	15% 4 6% 12% 26% 37%	3308
	11th to 20th	Day	22% 3 7% 18% 36% 14%	3150
	21st to end	Day	14% 3 6% 29% 38% 10%	3438
November	1st to 10th	Day	12% 4 13% 27% 31% 12%	1869
	11th to 20th	Day	11% 5% 10% 34% 34% 6%	1800
	21st to end	Day	15% 7% 12% 27% 31% 7%	1800
December	1st to 10th	Day	14% 5% 14% 33% 26% 7%	2950
	11th to 20th	Day	17% 8% 21% 35% 18% 1	3408
	21st to end	Day	25% 7% 18% 25% 17% 8%	4510
January	1st to 10th	Night	18% 8% 15% 33% 23% 3	5867
	11th to 20th	Night	12% 7% 14% 27% 33% 7%	5880
	21st to end	Night	23% 7% 12% 24% 27% 6%	6468
February	1st to 10th	Night	18% 7% 19% 27% 21% 8%	2600
	11th to 20th	Night	19% 7% 12% 25% 29% 8%	2440
	21st to end	Night	18% 9% 12% 25% 27% 9%	1980
March	1st to 10th	Night	18% 10% 10% 19% 27% 16%	4945
	11th to 20th	Night	30% 8% 9% 24% 22% 8%	5000
	21st to end	Night	17% 8% 13% 30% 30% 3	5489
April	1st to 10th	Night	17% 8% 10% 24% 29% 13%	2180
	11th to 20th	Night	18% 6% 11% 22% 30% 13%	1922
	21st to end	Night	15% 7% 9% 28% 33% 8%	1800
May	1st to 10th	Night	22% 6% 10% 17% 29% 16%	4097
	11th to 20th	Night	15% 6% 8% 18% 38% 15%	4075
	21st to end	Night	12% 6% 7% 21% 36% 18%	4474
June	1st to 10th	Night	13% 5% 10% 16% 30% 25%	1795
	11th to 20th	Night	12% 4 8% 12% 21% 43%	1710
	21st to end	Night	12% 5% 7% 10% 22% 44%	1710
July	1st to 10th	Night	11% 4 6% 7% 9% 63%	2815
	11th to 20th	Night	22% 7% 10% 15% 23% 22%	2806
	21st to end	Night	19% 7% 12% 22% 14% 27%	3011
August	1st to 10th	Night	22% 7% 11% 27% 16% 17%	2838
	11th to 20th	Night	16% 5% 15% 16% 21% 28%	2838
	21st to end	Night	14% 4 10% 16% 25% 31%	3287
September	1st to 10th	Night	16% 6% 10% 14% 21% 34%	2026
	11th to 20th	Night	12% 6% 9% 18% 24% 32%	2090
	21st to end	Night	11% 4 6% 15% 34% 31%	2090
October	1st to 10th	Night	12% 4 5% 12% 26% 41%	3666
	11th to 20th	Night	21% 3 5% 16% 41% 14%	3778
	21st to end	Night	15% 3 6% 27% 38% 11%	4120
November	1st to 10th	Night	15% 4 10% 25% 33% 13%	2425
	11th to 20th	Night	11% 5% 11% 28% 39% 7%	2600
	21st to end	Night	15% 5% 10% 26% 36% 9%	2600
December	1st to 10th	Night	13% 4 10% 35% 29% 8%	4240
	11th to 20th	Night	15% 7% 15% 43% 19% 2	4811
	21st to end	Night	20% 7% 17% 31% 18% 7%	6468

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	6% 14% 34% 30% 14% 3	300
	11th to 20th	Day	8% 11% 31% 32% 16% 2	300
	21st to end	Day	3 8% 31% 36% 18% 4	330
February	1st to 10th	Day	1 12% 44% 27% 13% 3	300
	11th to 20th	Day	5% 13% 40% 32% 10% 1	389
	21st to end	Day	6% 22% 34% 29% 9% 1	414
March	1st to 10th	Day	7% 19% 36% 24% 12% 1	500
	11th to 20th	Day	9% 16% 34% 27% 10% 4	500
	21st to end	Day	10% 22% 39% 22% 6% 1	550
April	1st to 10th	Day	7% 19% 36% 23% 12% 3	500
	11th to 20th	Day	10% 23% 36% 23% 7% 2	492
	21st to end	Day	9% 22% 30% 24% 12% 2	500
May	1st to 10th	Day	9% 18% 36% 25% 11% 2	503
	11th to 20th	Day	7% 17% 27% 28% 16% 5%	528
	21st to end	Day	9% 16% 28% 25% 17% 5%	573
June	1st to 10th	Day	3 12% 29% 33% 18% 5%	527
	11th to 20th	Day	5% 16% 32% 30% 13% 4	490
	21st to end	Day	4 10% 33% 34% 17% 3	490
July	1st to 10th	Day	3 3 23% 41% 22% 6%	486
	11th to 20th	Day	5% 4 14% 33% 34% 10%	484
	21st to end	Day	3 2 14% 37% 35% 10%	531
August	1st to 10th	Day	5% 2 20% 38% 29% 6%	487
	11th to 20th	Day	4 3 22% 38% 26% 7%	477
	21st to end	Day	5% 4 19% 37% 27% 8%	539
September	1st to 10th	Day	4 6% 21% 30% 28% 10%	490
	11th to 20th	Day	5% 16% 23% 32% 18% 6%	490
	21st to end	Day	6% 13% 20% 34% 21% 6%	490
October	1st to 10th	Day	6% 11% 25% 30% 22% 7%	386
	11th to 20th	Day	7% 12% 23% 27% 27% 5%	300
	21st to end	Day	6% 12% 25% 34% 20% 3	330
November	1st to 10th	Day	7% 13% 29% 26% 20% 5%	300
	11th to 20th	Day	3 8% 32% 35% 18% 5%	300
	21st to end	Day	3 10% 29% 31% 24% 4	300
December	1st to 10th	Day	2 7% 32% 35% 17% 6%	300
	11th to 20th	Day	3 5% 36% 34% 19% 3	300
	21st to end	Day	9% 10% 32% 34% 14% 2	330
January	1st to 10th	Night	4 7% 29% 37% 18% 5%	800
	11th to 20th	Night	5% 4 33% 34% 21% 3	800
	21st to end	Night	3 4 34% 39% 16% 5%	880
February	1st to 10th	Night	3 5% 39% 37% 13% 4	800
	11th to 20th	Night	3 5% 42% 35% 13% 2	784
	21st to end	Night	4 7% 38% 38% 10% 2	660
March	1st to 10th	Night	5% 11% 34% 36% 14% 1	800
	11th to 20th	Night	5% 6% 31% 38% 19% 2	800
	21st to end	Night	4 12% 37% 35% 11% 2	880
April	1st to 10th	Night	4 11% 39% 32% 13% 2	780
	11th to 20th	Night	4 12% 36% 36% 11% 1	593
	21st to end	Night	3 12% 37% 32% 14% 3	600
May	1st to 10th	Night	5% 9% 32% 39% 13% 2	600
	11th to 20th	Night	3 5% 28% 37% 23% 4	591
	21st to end	Night	4 9% 28% 36% 20% 3	650
June	1st to 10th	Night	2 6% 21% 45% 23% 2	599
	11th to 20th	Night	3 7% 27% 43% 18% 2	570
	21st to end	Night	2 1 24% 46% 25% 2	570
July	1st to 10th	Night	2 1 17% 40% 34% 6%	555
	11th to 20th	Night	2 1 10% 38% 43% 6%	552
	21st to end	Night	3 1 6% 36% 50% 4	624
August	1st to 10th	Night	2 1 9% 43% 41% 3	567
	11th to 20th	Night	3 2 15% 38% 40% 3	564
	21st to end	Night	3 1 13% 41% 34% 8%	627
September	1st to 10th	Night	4 1 12% 37% 38% 8%	696
	11th to 20th	Night	2 2 18% 41% 28% 9%	760
	21st to end	Night	3 4 20% 34% 32% 8%	760
October	1st to 10th	Night	5% 5% 21% 39% 27% 4	760
	11th to 20th	Night	3 4 23% 41% 22% 7%	760
	21st to end	Night	6% 5% 25% 33% 24% 7%	836
November	1st to 10th	Night	3 5% 28% 36% 24% 5%	780
	11th to 20th	Night	2 4 30% 38% 22% 5%	800
	21st to end	Night	3 6% 28% 36% 21% 6%	800
December	1st to 10th	Night	4 5% 28% 39% 21% 3	800
	11th to 20th	Night	4 3 32% 39% 20% 2	800
	21st to end	Night	4 8% 33% 40% 14% 2	880

Page generated at 2025-06-07 08:28:19. Version ac07

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