Pawnee Buttes Trailhead
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pawnee Buttes Trailhead clear sky chart from 2005-11-06 to 2026-02-16.

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	5% 5% 2 5% 4 4 4 4 6% 8% 53%	139619
	Night	6% 6% 2 6% 4 4 4 4 6% 7% 52%	138719
Transparency	Day	27% 6% 11% 25% 23% 8%	134528
	Night	29% 6% 12% 25% 21% 7%	134820
Seeing	Day	9% 9% 28% 31% 18% 5%	17389
	Night	8% 9% 33% 37% 12% 1	27511

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	2 7% 3 7% 4 4 4 3 4 5% 56%	4720
	11th to 20th	Day	1 4 2 7% 4 4 4 4 6% 8% 56%	4740
	21st to end	Day	1 5% 2 7% 3 3 3 3 5% 7% 60%	5641
February	1st to 10th	Day	2 8% 4 10% 5% 4 4 4 6% 7% 47%	1908
	11th to 20th	Day	3 8% 2 7% 4 4 5% 4 6% 7% 49%	1999
	21st to end	Day	2 8% 3 7% 4 4 4 4 5% 6% 54%	1650
March	1st to 10th	Day	4 9% 3 6% 4 3 4 3 5% 8% 52%	4500
	11th to 20th	Day	5% 7% 3 6% 4 4 4 3 5% 7% 53%	4740
	21st to end	Day	5% 9% 3 8% 4 5% 5% 4 6% 9% 44%	5942
April	1st to 10th	Day	8% 7% 2 5% 4 4 4 4 6% 7% 49%	2400
	11th to 20th	Day	11% 8% 2 6% 4 4 4 4 6% 7% 43%	2371
	21st to end	Day	11% 7% 2 6% 5% 4 4 4 5% 8% 43%	2430
May	1st to 10th	Day	9% 6% 2 7% 5% 4 4 4 5% 6% 48%	5900
	11th to 20th	Day	6% 4 2 5% 4 4 6% 5% 7% 9% 48%	6203
	21st to end	Day	12% 6% 2 5% 4 4 4 4 6% 8% 46%	6925
June	1st to 10th	Day	6% 3 1 3 3 4 4 5% 8% 10% 53%	2800
	11th to 20th	Day	6% 4 2 4 4 3 5% 4 6% 9% 54%	2800
	21st to end	Day	4 2 1 4 4 4 4 4 8% 9% 56%	2800
July	1st to 10th	Day	5% 3 1 4 3 4 4 4 6% 8% 55%	6339
	11th to 20th	Day	4 3 1 4 4 5% 6% 5% 8% 10% 50%	6340
	21st to end	Day	5% 3 2 6% 5% 5% 5% 5% 7% 9% 49%	6903
August	1st to 10th	Day	8% 3 1 4 3 4 5% 4 8% 10% 49%	5908
	11th to 20th	Day	3 3 1 4 3 4 5% 4 7% 9% 58%	5366
	21st to end	Day	8% 5% 2 6% 4 4 5% 4 6% 8% 49%	5984
September	1st to 10th	Day	5% 3 1 4 3 3 3 3 5% 8% 62%	2400
	11th to 20th	Day	6% 2 1 3 3 3 4 3 5% 8% 61%	2329
	21st to end	Day	7% 4 1 3 2 3 3 2 4 6% 64%	2200
October	1st to 10th	Day	6% 3 1 2 2 2 2 1 3 4 74%	3410
	11th to 20th	Day	4 4 2 5% 3 3 3 2 4 6% 64%	3250
	21st to end	Day	7% 5% 2 4 2 2 3 3 5% 8% 59%	3270
November	1st to 10th	Day	3 5% 2 4 3 3 4 3 5% 8% 61%	1853
	11th to 20th	Day	3 6% 1 3 3 3 3 4 5% 7% 60%	1890
	21st to end	Day	3 6% 2 5% 3 4 3 3 4 7% 59%	1810
December	1st to 10th	Day	2 4 2 5% 3 3 3 3 4 6% 67%	2700
	11th to 20th	Day	2 6% 3 5% 3 3 4 3 5% 6% 60%	3106
	21st to end	Day	4 7% 2 6% 4 4 4 4 6% 9% 49%	4092
January	1st to 10th	Night	3 7% 3 8% 4 4 4 3 5% 6% 53%	8201
	11th to 20th	Night	1 6% 2 7% 4 4 4 3 6% 7% 56%	8250
	21st to end	Night	2 6% 3 6% 4 4 4 3 5% 6% 58%	8630
February	1st to 10th	Night	3 8% 4 7% 5% 4 4 3 5% 7% 49%	2710
	11th to 20th	Night	4 8% 4 7% 6% 5% 4 4 6% 8% 46%	2398
	21st to end	Night	2 8% 3 6% 4 4 5% 3 4 5% 56%	1980
March	1st to 10th	Night	4 9% 4 8% 4 3 3 3 4 5% 55%	5374
	11th to 20th	Night	6% 8% 3 6% 4 3 3 3 4 6% 52%	5234
	21st to end	Night	9% 9% 3 7% 4 5% 4 4 6% 8% 42%	5012
April	1st to 10th	Night	8% 8% 2 7% 4 4 4 3 5% 5% 49%	2000
	11th to 20th	Night	12% 6% 3 6% 4 4 3 3 6% 6% 46%	1977
	21st to end	Night	14% 9% 2 6% 3 4 4 4 6% 6% 42%	1970
May	1st to 10th	Night	11% 7% 2 6% 4 4 5% 4 5% 7% 45%	4080
	11th to 20th	Night	9% 5% 2 6% 3 5% 5% 4 6% 9% 46%	3708
	21st to end	Night	16% 8% 2 5% 4 4 4 4 5% 7% 41%	3972
June	1st to 10th	Night	6% 4 1 4 3 4 3 5% 9% 11% 50%	1600
	11th to 20th	Night	7% 4 1 4 5% 3 5% 4 5% 9% 53%	1600
	21st to end	Night	6% 4 2 5% 4 5% 4 5% 7% 9% 50%	1600
July	1st to 10th	Night	4 4 1 5% 4 4 6% 4 6% 8% 53%	3640
	11th to 20th	Night	5% 3 1 5% 4 4 6% 5% 8% 11% 48%	3640
	21st to end	Night	6% 4 2 5% 5% 5% 5% 5% 8% 9% 45%	3970
August	1st to 10th	Night	11% 4 2 5% 4 6% 5% 5% 8% 9% 41%	3898
	11th to 20th	Night	3 5% 2 7% 5% 5% 6% 4 7% 8% 49%	4483
	21st to end	Night	8% 6% 2 6% 4 4 5% 4 7% 8% 44%	4993
September	1st to 10th	Night	6% 4 1 5% 3 4 4 5% 6% 8% 55%	2000
	11th to 20th	Night	7% 3 2 4 3 3 4 3 5% 7% 58%	2070
	21st to end	Night	6% 4 1 5% 4 3 3 2 4 5% 63%	2200
October	1st to 10th	Night	6% 2 1 3 2 3 2 2 4 5% 70%	3772
	11th to 20th	Night	7% 4 1 5% 3 3 3 3 5% 7% 58%	3898
	21st to end	Night	6% 5% 2 4 3 3 3 3 5% 6% 60%	4497
November	1st to 10th	Night	4 4 2 5% 4 3 3 3 5% 7% 59%	2665
	11th to 20th	Night	4 6% 2 4 4 4 3 3 5% 7% 59%	2730
	21st to end	Night	4 7% 2 5% 3 4 3 3 6% 6% 56%	2808
December	1st to 10th	Night	2 4 1 4 3 4 3 4 4 6% 65%	4710
	11th to 20th	Night	2 4 2 5% 3 3 4 4 6% 7% 60%	5321
	21st to end	Night	5% 8% 3 7% 4 4 4 4 6% 7% 47%	7128

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% 4 9% 32% 21% 4	4723
	11th to 20th	Day	24% 6% 13% 27% 23% 6%	4740
	21st to end	Day	24% 4 11% 27% 26% 7%	5641
February	1st to 10th	Day	36% 4 13% 25% 17% 5%	1908
	11th to 20th	Day	32% 5% 11% 28% 19% 5%	2009
	21st to end	Day	30% 4 9% 27% 22% 8%	1650
March	1st to 10th	Day	28% 4 8% 19% 33% 8%	4500
	11th to 20th	Day	28% 6% 11% 25% 26% 4	4740
	21st to end	Day	33% 9% 15% 29% 12% 2	5942
April	1st to 10th	Day	31% 8% 13% 25% 17% 7%	2400
	11th to 20th	Day	38% 7% 11% 21% 16% 6%	2374
	21st to end	Day	36% 7% 10% 28% 17% 2	2430
May	1st to 10th	Day	34% 8% 11% 28% 16% 3	5900
	11th to 20th	Day	27% 10% 12% 23% 24% 4	6207
	21st to end	Day	32% 8% 14% 25% 18% 2	6926
June	1st to 10th	Day	23% 8% 19% 27% 16% 6%	2800
	11th to 20th	Day	26% 6% 11% 25% 23% 10%	2800
	21st to end	Day	21% 7% 12% 25% 25% 11%	2800
July	1st to 10th	Day	23% 7% 9% 19% 30% 13%	6271
	11th to 20th	Day	23% 7% 13% 27% 19% 11%	6265
	21st to end	Day	29% 7% 11% 19% 18% 17%	6705
August	1st to 10th	Day	28% 8% 14% 26% 17% 7%	4296
	11th to 20th	Day	24% 8% 11% 21% 23% 13%	3882
	21st to end	Day	22% 6% 10% 21% 27% 15%	4311
September	1st to 10th	Day	20% 4 8% 24% 28% 15%	2400
	11th to 20th	Day	22% 5% 8% 22% 28% 15%	2329
	21st to end	Day	22% 4 7% 22% 34% 11%	2200
October	1st to 10th	Day	16% 3 6% 18% 32% 25%	3410
	11th to 20th	Day	23% 4 9% 29% 27% 9%	3250
	21st to end	Day	24% 3 9% 27% 29% 8%	3270
November	1st to 10th	Day	22% 4 12% 27% 26% 9%	1853
	11th to 20th	Day	23% 4 9% 28% 29% 7%	1890
	21st to end	Day	26% 4 9% 27% 26% 8%	1810
December	1st to 10th	Day	20% 4 8% 33% 29% 7%	2700
	11th to 20th	Day	24% 5% 9% 35% 24% 4	3104
	21st to end	Day	30% 6% 11% 30% 19% 5%	4092
January	1st to 10th	Night	31% 4 11% 29% 18% 6%	8202
	11th to 20th	Night	25% 6% 11% 26% 23% 9%	8250
	21st to end	Night	27% 6% 10% 27% 24% 6%	8630
February	1st to 10th	Night	35% 5% 13% 24% 19% 4	2710
	11th to 20th	Night	34% 6% 13% 25% 19% 4	2398
	21st to end	Night	30% 4 9% 24% 25% 8%	1980
March	1st to 10th	Night	31% 5% 6% 18% 31% 9%	5374
	11th to 20th	Night	32% 4 11% 17% 28% 7%	5234
	21st to end	Night	38% 8% 15% 25% 12% 1	5012
April	1st to 10th	Night	35% 6% 10% 24% 18% 6%	2000
	11th to 20th	Night	38% 6% 13% 23% 17% 4	1977
	21st to end	Night	40% 7% 11% 23% 18% 2	1970
May	1st to 10th	Night	35% 9% 14% 29% 10% 3	4080
	11th to 20th	Night	31% 10% 16% 24% 15% 5%	3709
	21st to end	Night	40% 10% 16% 20% 11% 3	3972
June	1st to 10th	Night	24% 10% 23% 26% 13% 4	1600
	11th to 20th	Night	28% 7% 14% 24% 18% 10%	1600
	21st to end	Night	28% 8% 12% 26% 20% 6%	1600
July	1st to 10th	Night	25% 7% 12% 23% 27% 6%	3600
	11th to 20th	Night	27% 8% 19% 22% 19% 5%	3592
	21st to end	Night	30% 8% 14% 22% 19% 8%	3856
August	1st to 10th	Night	38% 9% 17% 20% 13% 3	2834
	11th to 20th	Night	33% 9% 14% 20% 16% 8%	3243
	21st to end	Night	24% 7% 17% 22% 21% 9%	3597
September	1st to 10th	Night	25% 7% 9% 22% 24% 13%	2000
	11th to 20th	Night	24% 6% 10% 25% 24% 12%	2070
	21st to end	Night	23% 5% 8% 25% 26% 12%	2200
October	1st to 10th	Night	17% 4 7% 19% 28% 25%	3772
	11th to 20th	Night	25% 5% 10% 29% 23% 8%	3898
	21st to end	Night	25% 4 9% 28% 24% 11%	4497
November	1st to 10th	Night	23% 5% 12% 25% 26% 10%	2665
	11th to 20th	Night	25% 4 10% 27% 25% 9%	2730
	21st to end	Night	28% 4 10% 26% 25% 7%	2808
December	1st to 10th	Night	20% 4 10% 33% 26% 6%	4710
	11th to 20th	Night	22% 4 8% 38% 23% 4	5322
	21st to end	Night	34% 5% 10% 27% 21% 3	7128

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	7% 12% 31% 36% 11% 3	330
	11th to 20th	Day	10% 14% 40% 28% 7% 1	330
	21st to end	Day	5% 13% 50% 24% 8% 1	363
February	1st to 10th	Day	5% 18% 45% 28% 3 1	330
	11th to 20th	Day	9% 11% 43% 28% 8% 1	315
	21st to end	Day	6% 19% 42% 29% 4	249
March	1st to 10th	Day	7% 14% 35% 28% 15% 2	300
	11th to 20th	Day	10% 15% 30% 31% 13% 2	383
	21st to end	Day	13% 15% 37% 26% 8% 1	550
April	1st to 10th	Day	14% 18% 37% 22% 9% 1	500
	11th to 20th	Day	17% 19% 32% 23% 7% 2	492
	21st to end	Day	16% 18% 28% 25% 10% 3	530
May	1st to 10th	Day	15% 12% 27% 28% 13% 4	703
	11th to 20th	Day	14% 8% 26% 28% 19% 4	725
	21st to end	Day	13% 9% 27% 28% 19% 5%	789
June	1st to 10th	Day	6% 7% 21% 35% 22% 10%	730
	11th to 20th	Day	8% 6% 29% 35% 18% 4	730
	21st to end	Day	5% 4 27% 36% 22% 5%	730
July	1st to 10th	Day	8% 3 15% 34% 31% 9%	721
	11th to 20th	Day	4 2 18% 34% 34% 9%	718
	21st to end	Day	4 2 15% 34% 35% 10%	794
August	1st to 10th	Day	6% 3 16% 38% 31% 7%	622
	11th to 20th	Day	2 4 20% 36% 26% 11%	517
	21st to end	Day	6% 3 20% 36% 27% 8%	583
September	1st to 10th	Day	6% 3 22% 35% 24% 10%	530
	11th to 20th	Day	5% 4 21% 32% 29% 10%	459
	21st to end	Day	12% 4 22% 28% 22% 12%	330
October	1st to 10th	Day	11% 6% 27% 22% 25% 9%	330
	11th to 20th	Day	7% 10% 37% 27% 12% 6%	330
	21st to end	Day	11% 12% 30% 32% 13% 3	363
November	1st to 10th	Day	6% 12% 33% 32% 13% 4	330
	11th to 20th	Day	5% 14% 35% 31% 12% 2	330
	21st to end	Day	9% 10% 29% 39% 11% 2	330
December	1st to 10th	Day	7% 18% 35% 28% 11% 1	330
	11th to 20th	Day	10% 14% 45% 24% 6%	330
	21st to end	Day	8% 14% 41% 28% 9% 1	363
January	1st to 10th	Night	7% 12% 37% 34% 10% 1	1050
	11th to 20th	Night	5% 17% 42% 28% 7% 1	1050
	21st to end	Night	6% 10% 46% 30% 6% 1	1015
February	1st to 10th	Night	8% 11% 45% 29% 6%	840
	11th to 20th	Night	6% 11% 45% 31% 6%	804
	21st to end	Night	7% 13% 48% 28% 4	660
March	1st to 10th	Night	7% 10% 39% 36% 8%	800
	11th to 20th	Night	10% 10% 36% 34% 10% 1	800
	21st to end	Night	11% 13% 38% 30% 7% 1	675
April	1st to 10th	Night	13% 15% 35% 31% 5% 1	600
	11th to 20th	Night	16% 11% 36% 31% 6% 1	593
	21st to end	Night	17% 13% 30% 32% 8% 1	600
May	1st to 10th	Night	15% 11% 30% 32% 12%	600
	11th to 20th	Night	17% 6% 27% 37% 11% 1	591
	21st to end	Night	14% 7% 32% 32% 14% 1	650
June	1st to 10th	Night	7% 5% 25% 42% 20% 1	600
	11th to 20th	Night	7% 7% 30% 45% 11% 1	600
	21st to end	Night	7% 3 26% 47% 17% 1	600
July	1st to 10th	Night	9% 2 17% 49% 23% 1	585
	11th to 20th	Night	5% 2 14% 53% 24% 2	582
	21st to end	Night	6% 3 13% 51% 26% 1	657
August	1st to 10th	Night	7% 3 16% 48% 25% 2	597
	11th to 20th	Night	4 3 18% 53% 23% 1	594
	21st to end	Night	7% 2 16% 50% 24% 1	660
September	1st to 10th	Night	8% 3 18% 50% 21% 2	600
	11th to 20th	Night	8% 5% 20% 45% 19% 3	600
	21st to end	Night	8% 4 27% 42% 18% 1	600
October	1st to 10th	Night	13% 7% 25% 35% 19% 2	704
	11th to 20th	Night	8% 7% 36% 33% 15% 1	800
	21st to end	Night	9% 11% 30% 37% 11% 1	1024
November	1st to 10th	Night	6% 7% 37% 37% 10% 1	1025
	11th to 20th	Night	7% 12% 36% 37% 7% 1	1050
	21st to end	Night	7% 10% 35% 38% 9% 1	1050
December	1st to 10th	Night	6% 13% 42% 32% 6%	1050
	11th to 20th	Night	7% 12% 40% 33% 7% 1	1050
	21st to end	Night	10% 13% 38% 33% 5%	1155

Page generated at 2026-02-12 23:42:11. Version ac07

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