Caprock Canyons State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Caprock Canyons State Park clear sky chart from 2005-11-06 to 2025-11-18.

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	7% 4 1 4 3 3 3 3 5% 6% 61%	135446
	Night	6% 4 1 4 3 3 3 3 5% 7% 62%	132325
Transparency	Day	24% 3 7% 22% 27% 16%	130495
	Night	23% 3 7% 21% 27% 18%	128283
Seeing	Day	9% 7% 26% 32% 20% 5%	16637
	Night	8% 8% 32% 38% 14% 1	26548

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% 6% 3 6% 3 3 3 3 4 4 58%	4077
	11th to 20th	Day	3 4 1 3 2 2 3 2 4 6% 71%	4080
	21st to end	Day	9% 4 2 3 3 4 4 3 5% 6% 59%	4966
February	1st to 10th	Day	6% 6% 2 5% 2 2 2 2 4 6% 63%	2000
	11th to 20th	Day	6% 6% 1 6% 3 3 3 3 4 6% 59%	1949
	21st to end	Day	6% 6% 2 4 3 3 3 2 4 4 62%	1650
March	1st to 10th	Day	8% 4 2 4 3 2 3 3 4 6% 62%	4500
	11th to 20th	Day	7% 5% 2 4 3 3 3 2 4 7% 61%	4879
	21st to end	Day	4 5% 1 4 4 3 4 3 6% 7% 60%	5548
April	1st to 10th	Day	6% 5% 1 4 3 3 2 3 4 6% 64%	2400
	11th to 20th	Day	10% 4 2 4 3 3 3 3 5% 5% 58%	2371
	21st to end	Day	8% 3 1 3 3 2 4 4 5% 6% 61%	2442
May	1st to 10th	Day	15% 5% 1 3 2 2 3 2 4 7% 56%	5900
	11th to 20th	Day	10% 4 2 3 2 3 2 2 4 5% 63%	5862
	21st to end	Day	10% 5% 2 4 3 3 4 4 5% 6% 55%	6446
June	1st to 10th	Day	6% 4 2 4 3 4 4 4 6% 8% 54%	2600
	11th to 20th	Day	4 4 1 3 3 3 3 3 6% 8% 62%	2600
	21st to end	Day	3 3 1 4 4 4 4 4 5% 8% 61%	2600
July	1st to 10th	Day	10% 6% 2 6% 4 5% 5% 4 6% 8% 44%	5899
	11th to 20th	Day	3 2 1 4 3 3 4 3 6% 9% 62%	5900
	21st to end	Day	2 2 1 3 3 3 4 4 5% 8% 64%	6424
August	1st to 10th	Day	5% 2 1 3 2 3 4 3 5% 8% 62%	5489
	11th to 20th	Day	4 2 1 4 3 4 5% 4 7% 9% 57%	5366
	21st to end	Day	8% 4 1 5% 3 4 3 3 5% 8% 56%	5984
September	1st to 10th	Day	8% 3 1 4 4 3 4 3 6% 7% 56%	2336
	11th to 20th	Day	9% 4 1 5% 4 3 4 3 5% 9% 53%	2200
	21st to end	Day	7% 3 1 3 3 3 3 3 4 6% 64%	2200
October	1st to 10th	Day	5% 2 1 3 2 2 2 1 2 3 77%	3590
	11th to 20th	Day	11% 3 1 3 3 2 3 2 3 4 64%	3568
	21st to end	Day	5% 3 1 2 1 2 2 2 3 5% 73%	3285
November	1st to 10th	Day	6% 4 1 3 2 1 2 2 5% 5% 68%	1853
	11th to 20th	Day	4 3 1 2 2 2 3 3 3 5% 72%	1863
	21st to end	Day	9% 4 2 4 2 2 3 2 4 5% 63%	1800
December	1st to 10th	Day	4 5% 2 4 3 3 3 3 5% 6% 63%	2940
	11th to 20th	Day	4 2 1 3 2 3 4 4 4 5% 67%	3391
	21st to end	Day	6% 8% 2 4 3 3 3 2 3 4 62%	4488
January	1st to 10th	Night	6% 6% 3 5% 3 3 3 3 4 5% 58%	5888
	11th to 20th	Night	3 4 1 3 2 2 3 3 4 6% 69%	5900
	21st to end	Night	6% 7% 2 5% 3 4 4 3 4 6% 55%	6053
February	1st to 10th	Night	7% 6% 1 4 3 3 3 3 3 5% 62%	2400
	11th to 20th	Night	7% 5% 2 5% 4 3 3 2 4 7% 58%	2338
	21st to end	Night	6% 5% 2 4 3 3 3 2 5% 6% 62%	1980
March	1st to 10th	Night	4 4 2 5% 2 2 3 3 5% 5% 63%	5374
	11th to 20th	Night	5% 3 1 4 3 3 3 3 4 5% 66%	5083
	21st to end	Night	3 3 2 5% 4 3 4 3 5% 7% 60%	5382
April	1st to 10th	Night	5% 5% 1 3 3 3 4 2 4 7% 65%	2000
	11th to 20th	Night	7% 3 1 5% 3 3 3 3 6% 6% 60%	1977
	21st to end	Night	8% 4 1 2 3 3 3 2 5% 6% 62%	1955
May	1st to 10th	Night	13% 4 1 4 3 3 2 2 4 6% 58%	4080
	11th to 20th	Night	7% 3 2 3 3 3 3 3 5% 6% 63%	4053
	21st to end	Night	11% 5% 2 4 3 2 3 3 4 6% 58%	4451
June	1st to 10th	Night	5% 3 1 4 4 4 4 4 7% 9% 55%	1800
	11th to 20th	Night	3 2 1 3 3 3 4 3 8% 12% 59%	1800
	21st to end	Night	3 3 1 4 3 2 4 4 6% 9% 59%	1800
July	1st to 10th	Night	6% 5% 2 7% 5% 5% 5% 4 7% 9% 46%	4080
	11th to 20th	Night	3 3 1 4 3 4 4 4 7% 11% 56%	4080
	21st to end	Night	2 2 1 3 3 4 4 5% 7% 11% 59%	4449
August	1st to 10th	Night	3 2 1 3 3 3 3 3 5% 10% 64%	4318
	11th to 20th	Night	4 3 1 4 4 6% 5% 5% 7% 11% 50%	4483
	21st to end	Night	8% 4 2 4 3 3 3 3 5% 8% 58%	4993
September	1st to 10th	Night	7% 4 1 4 4 4 4 3 6% 6% 56%	2061
	11th to 20th	Night	9% 4 2 5% 3 4 4 3 5% 8% 52%	2200
	21st to end	Night	6% 3 1 3 2 2 2 3 5% 6% 66%	2200
October	1st to 10th	Night	4 2 1 2 2 1 2 2 3 4 78%	3590
	11th to 20th	Night	9% 3 1 3 2 2 3 2 4 6% 65%	3570
	21st to end	Night	4 2 1 2 1 1 1 1 3 5% 77%	4474
November	1st to 10th	Night	6% 3 1 2 2 1 3 3 3 5% 71%	2665
	11th to 20th	Night	3 2 1 3 2 2 2 2 3 5% 73%	2692
	21st to end	Night	7% 4 1 3 2 2 4 3 5% 5% 62%	2600
December	1st to 10th	Night	5% 3 1 3 2 3 3 3 4 6% 66%	4250
	11th to 20th	Night	4 3 1 3 2 3 3 2 5% 6% 68%	4816
	21st to end	Night	5% 6% 2 5% 3 3 3 3 4 5% 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	30% 2 5% 26% 25% 12%	4078
	11th to 20th	Day	18% 2 5% 22% 32% 22%	4080
	21st to end	Day	28% 2 6% 20% 29% 15%	4966
February	1st to 10th	Day	25% 3 6% 23% 26% 18%	2000
	11th to 20th	Day	29% 2 6% 24% 23% 16%	1959
	21st to end	Day	27% 2 3 16% 31% 22%	1650
March	1st to 10th	Day	25% 1 3 11% 26% 33%	4500
	11th to 20th	Day	25% 2 4 18% 27% 23%	4879
	21st to end	Day	24% 3 6% 26% 29% 12%	5548
April	1st to 10th	Day	23% 3 6% 18% 27% 23%	2400
	11th to 20th	Day	28% 4 6% 18% 24% 20%	2374
	21st to end	Day	24% 4 8% 24% 28% 13%	2442
May	1st to 10th	Day	30% 3 9% 22% 20% 15%	5900
	11th to 20th	Day	25% 3 5% 17% 22% 28%	5866
	21st to end	Day	30% 5% 9% 17% 19% 20%	6447
June	1st to 10th	Day	26% 6% 13% 29% 17% 9%	2600
	11th to 20th	Day	21% 4 10% 23% 28% 14%	2600
	21st to end	Day	21% 5% 11% 30% 22% 11%	2600
July	1st to 10th	Day	36% 6% 9% 22% 22% 4	5836
	11th to 20th	Day	18% 5% 10% 33% 29% 6%	5831
	21st to end	Day	17% 5% 17% 30% 26% 5%	6240
August	1st to 10th	Day	18% 5% 11% 25% 27% 14%	3994
	11th to 20th	Day	18% 4 10% 25% 30% 13%	3882
	21st to end	Day	23% 4 11% 25% 29% 8%	4311
September	1st to 10th	Day	27% 5% 10% 24% 23% 12%	2336
	11th to 20th	Day	29% 5% 9% 23% 27% 7%	2200
	21st to end	Day	22% 3 5% 22% 33% 14%	2200
October	1st to 10th	Day	15% 2 5% 14% 33% 30%	3590
	11th to 20th	Day	26% 2 5% 21% 23% 23%	3568
	21st to end	Day	17% 2 2 25% 40% 15%	3285
November	1st to 10th	Day	19% 3 6% 18% 34% 21%	1853
	11th to 20th	Day	16% 3 4 24% 34% 19%	1863
	21st to end	Day	25% 2 4 16% 32% 21%	1800
December	1st to 10th	Day	23% 2 4 31% 28% 12%	2940
	11th to 20th	Day	20% 2 5% 15% 38% 20%	3389
	21st to end	Day	28% 2 4 21% 32% 13%	4488
January	1st to 10th	Night	29% 2 5% 32% 24% 8%	5888
	11th to 20th	Night	18% 2 8% 18% 34% 19%	5900
	21st to end	Night	31% 2 6% 18% 28% 15%	6053
February	1st to 10th	Night	26% 3 6% 17% 30% 18%	2400
	11th to 20th	Night	29% 2 6% 22% 23% 18%	2338
	21st to end	Night	24% 2 4 16% 27% 26%	1980
March	1st to 10th	Night	23% 2 3 13% 22% 36%	5374
	11th to 20th	Night	22% 2 5% 18% 17% 37%	5083
	21st to end	Night	23% 3 7% 23% 28% 16%	5382
April	1st to 10th	Night	22% 3 8% 19% 25% 24%	2000
	11th to 20th	Night	25% 4 8% 19% 26% 19%	1977
	21st to end	Night	23% 4 9% 23% 26% 15%	1955
May	1st to 10th	Night	29% 4 10% 22% 18% 17%	4080
	11th to 20th	Night	22% 4 7% 14% 23% 29%	4054
	21st to end	Night	29% 4 9% 17% 15% 26%	4452
June	1st to 10th	Night	24% 5% 17% 29% 17% 8%	1800
	11th to 20th	Night	17% 5% 13% 26% 25% 14%	1800
	21st to end	Night	20% 5% 11% 29% 21% 15%	1800
July	1st to 10th	Night	34% 6% 12% 29% 17% 3	4035
	11th to 20th	Night	21% 5% 11% 28% 28% 7%	4026
	21st to end	Night	18% 5% 13% 29% 28% 7%	4320
August	1st to 10th	Night	15% 4 9% 26% 28% 17%	3137
	11th to 20th	Night	25% 5% 11% 20% 30% 10%	3243
	21st to end	Night	19% 4 14% 26% 28% 10%	3597
September	1st to 10th	Night	27% 5% 9% 23% 23% 12%	2061
	11th to 20th	Night	30% 5% 11% 18% 27% 9%	2200
	21st to end	Night	19% 4 7% 21% 31% 18%	2200
October	1st to 10th	Night	13% 2 6% 13% 31% 35%	3590
	11th to 20th	Night	23% 3 7% 18% 26% 24%	3570
	21st to end	Night	13% 1 4 21% 40% 21%	4474
November	1st to 10th	Night	17% 2 6% 22% 30% 23%	2665
	11th to 20th	Night	15% 3 4 21% 36% 21%	2692
	21st to end	Night	24% 3 3 18% 31% 21%	2600
December	1st to 10th	Night	20% 3 6% 28% 33% 11%	4250
	11th to 20th	Night	18% 2 3 15% 41% 20%	4817
	21st to end	Night	26% 3 5% 23% 31% 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	12% 11% 37% 28% 11% 1	300
	11th to 20th	Day	13% 17% 35% 24% 11% 1	300
	21st to end	Day	9% 12% 40% 28% 11%	330
February	1st to 10th	Day	11% 13% 38% 30% 7%	300
	11th to 20th	Day	12% 14% 41% 25% 8% 1	300
	21st to end	Day	15% 16% 39% 23% 6% 1	249
March	1st to 10th	Day	12% 9% 46% 26% 8%	300
	11th to 20th	Day	18% 12% 39% 23% 6% 3	300
	21st to end	Day	12% 13% 41% 23% 11%	363
April	1st to 10th	Day	10% 18% 44% 21% 6%	500
	11th to 20th	Day	14% 15% 46% 21% 3 1	492
	21st to end	Day	12% 13% 39% 28% 7% 1	542
May	1st to 10th	Day	12% 9% 39% 31% 10%	703
	11th to 20th	Day	13% 7% 31% 31% 16% 2	725
	21st to end	Day	11% 7% 33% 31% 16% 2	789
June	1st to 10th	Day	8% 4 23% 39% 23% 3	730
	11th to 20th	Day	6% 4 25% 42% 20% 4	730
	21st to end	Day	4 1 19% 41% 30% 5%	730
July	1st to 10th	Day	8% 2 9% 37% 31% 13%	721
	11th to 20th	Day	3 1 8% 41% 38% 10%	718
	21st to end	Day	3 2 5% 39% 38% 13%	794
August	1st to 10th	Day	4 1 10% 40% 37% 9%	591
	11th to 20th	Day	4 2 9% 38% 34% 13%	517
	21st to end	Day	7% 1 9% 33% 37% 13%	583
September	1st to 10th	Day	7% 1 9% 38% 33% 12%	466
	11th to 20th	Day	5% 2 13% 40% 33% 7%	330
	21st to end	Day	9% 4 14% 35% 28% 11%	330
October	1st to 10th	Day	8% 4 24% 33% 23% 9%	330
	11th to 20th	Day	8% 8% 25% 34% 22% 4	330
	21st to end	Day	18% 8% 28% 26% 17% 4	363
November	1st to 10th	Day	12% 9% 33% 30% 14% 3	330
	11th to 20th	Day	6% 11% 32% 31% 14% 5%	321
	21st to end	Day	15% 13% 37% 19% 14% 2	300
December	1st to 10th	Day	9% 10% 40% 28% 13% 1	300
	11th to 20th	Day	7% 9% 37% 36% 10% 1	300
	21st to end	Day	15% 17% 38% 22% 8% 1	330
January	1st to 10th	Night	7% 11% 36% 37% 10%	1000
	11th to 20th	Night	8% 11% 39% 33% 8%	1000
	21st to end	Night	8% 9% 39% 37% 7% 1	910
February	1st to 10th	Night	10% 11% 39% 34% 6% 1	800
	11th to 20th	Night	11% 13% 40% 31% 4	784
	21st to end	Night	11% 14% 40% 32% 3	660
March	1st to 10th	Night	10% 14% 42% 30% 4	800
	11th to 20th	Night	13% 13% 40% 27% 6%	651
	21st to end	Night	7% 15% 44% 30% 4	660
April	1st to 10th	Night	8% 13% 47% 30% 3	600
	11th to 20th	Night	9% 14% 47% 28% 2	593
	21st to end	Night	10% 12% 43% 31% 4 1	600
May	1st to 10th	Night	11% 7% 45% 31% 6%	600
	11th to 20th	Night	10% 7% 34% 37% 11% 1	591
	21st to end	Night	9% 5% 39% 36% 11% 1	650
June	1st to 10th	Night	6% 3 30% 44% 16% 1	600
	11th to 20th	Night	4 3 39% 44% 10%	600
	21st to end	Night	4 2 23% 49% 22% 1	600
July	1st to 10th	Night	6% 2 13% 47% 29% 2	585
	11th to 20th	Night	5% 12% 50% 30% 2	582
	21st to end	Night	2 2 7% 49% 39% 1	657
August	1st to 10th	Night	3 1 8% 51% 35% 1	597
	11th to 20th	Night	8% 3 8% 44% 36% 2	594
	21st to end	Night	6% 9% 43% 38% 3	660
September	1st to 10th	Night	7% 2 12% 44% 32% 3	600
	11th to 20th	Night	11% 2 14% 49% 23% 1	600
	21st to end	Night	7% 3 21% 43% 25% 2	600
October	1st to 10th	Night	10% 4 25% 43% 17% 2	600
	11th to 20th	Night	10% 5% 33% 42% 10%	600
	21st to end	Night	8% 11% 31% 33% 16% 1	1013
November	1st to 10th	Night	8% 7% 32% 40% 12%	1025
	11th to 20th	Night	5% 10% 35% 38% 11%	1036
	21st to end	Night	8% 11% 37% 33% 10% 1	1000
December	1st to 10th	Night	10% 8% 36% 37% 9%	1000
	11th to 20th	Night	10% 10% 41% 32% 8%	1000
	21st to end	Night	10% 11% 35% 36% 7%	1100

Page generated at 2025-11-14 23:56:00. Version ac07

Copyright © 2025 Attilla Danko.