Royal Gorge Resort
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Royal Gorge Resort clear sky chart from 2005-11-06 to 2026-07-31.

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	4 7% 3 8% 5% 5% 5% 4 6% 8% 43%	146306
	Night	4 8% 3 9% 6% 5% 5% 4 6% 9% 40%	144041
Transparency	Day	32% 10% 13% 21% 17% 7%	141016
	Night	33% 11% 16% 21% 14% 5%	140337
Seeing	Day	8% 15% 32% 29% 13% 2	17262
	Night	7% 9% 27% 38% 17% 2	26643

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 11% 7% 15% 10% 10% 9% 6% 8% 9% 15%	4722
	11th to 20th	Day	1 6% 3 8% 7% 5% 5% 5% 6% 13% 41%	4740
	21st to end	Day	2 6% 4 11% 8% 7% 6% 5% 8% 11% 33%	5225
February	1st to 10th	Day	3 12% 5% 12% 8% 7% 8% 6% 9% 9% 22%	1890
	11th to 20th	Day	2 11% 6% 11% 8% 7% 8% 6% 8% 9% 26%	1952
	21st to end	Day	2 12% 5% 12% 8% 8% 7% 5% 8% 10% 24%	1730
March	1st to 10th	Day	2 8% 4 9% 7% 8% 8% 6% 7% 11% 31%	4634
	11th to 20th	Day	2 11% 4 10% 8% 7% 6% 5% 7% 9% 30%	5110
	21st to end	Day	4 12% 5% 13% 9% 7% 7% 6% 8% 8% 22%	5607
April	1st to 10th	Day	4 10% 4 10% 7% 6% 6% 5% 8% 9% 30%	2495
	11th to 20th	Day	4 9% 4 9% 6% 6% 7% 4 7% 8% 35%	2665
	21st to end	Day	5% 10% 4 10% 6% 6% 7% 5% 7% 8% 32%	2730
May	1st to 10th	Day	3 7% 2 6% 4 5% 5% 5% 7% 9% 47%	7626
	11th to 20th	Day	4 9% 3 8% 5% 6% 6% 4 7% 9% 41%	7596
	21st to end	Day	5% 8% 3 7% 5% 5% 5% 4 6% 8% 44%	9170
June	1st to 10th	Day	10% 8% 3 7% 6% 5% 5% 5% 7% 8% 36%	3150
	11th to 20th	Day	9% 7% 3 6% 5% 4 4 3 5% 7% 46%	3150
	21st to end	Day	4 5% 2 5% 4 4 4 4 5% 7% 58%	3150
July	1st to 10th	Day	3 3 1 4 4 3 5% 4 5% 6% 64%	6603
	11th to 20th	Day	2 3 1 4 3 3 4 3 5% 6% 66%	6460
	21st to end	Day	4 4 1 4 4 5% 5% 4 6% 7% 56%	7005
August	1st to 10th	Day	4 4 2 6% 4 6% 6% 5% 7% 8% 49%	5779
	11th to 20th	Day	2 2 1 3 3 4 4 4 5% 6% 66%	5798
	21st to end	Day	5% 6% 2 5% 3 4 4 3 4 5% 59%	6407
September	1st to 10th	Day	5% 3 1 4 3 3 4 3 4 6% 64%	2330
	11th to 20th	Day	6% 6% 2 5% 5% 3 5% 4 5% 6% 53%	2200
	21st to end	Day	7% 6% 2 4 4 3 2 3 4 7% 57%	2200
October	1st to 10th	Day	5% 6% 2 6% 3 3 3 3 4 5% 60%	3544
	11th to 20th	Day	4 7% 2 6% 3 4 4 4 6% 9% 52%	3193
	21st to end	Day	4 7% 3 8% 5% 5% 5% 4 6% 7% 45%	3200
November	1st to 10th	Day	6% 10% 4 9% 5% 4 5% 4 7% 9% 37%	1854
	11th to 20th	Day	5% 12% 5% 9% 6% 5% 6% 4 8% 11% 30%	1865
	21st to end	Day	3 10% 3 10% 7% 5% 4 6% 9% 13% 30%	1680
December	1st to 10th	Day	2 7% 3 9% 6% 7% 6% 4 5% 7% 43%	2462
	11th to 20th	Day	3 12% 6% 15% 8% 7% 7% 4 7% 9% 21%	2715
	21st to end	Day	2 11% 5% 15% 11% 9% 9% 6% 7% 9% 18%	3669
January	1st to 10th	Night	2 15% 5% 14% 10% 11% 8% 6% 8% 8% 14%	8172
	11th to 20th	Night	2 8% 4 11% 6% 5% 5% 5% 8% 12% 34%	8220
	21st to end	Night	2 7% 3 11% 9% 7% 5% 4 8% 12% 31%	8955
February	1st to 10th	Night	3 15% 7% 14% 8% 7% 7% 5% 7% 9% 18%	2730
	11th to 20th	Night	2 12% 4 13% 9% 7% 7% 6% 8% 11% 20%	2554
	21st to end	Night	2 12% 5% 13% 8% 6% 7% 6% 7% 10% 24%	2076
March	1st to 10th	Night	1 9% 4 11% 6% 9% 7% 5% 7% 10% 31%	5479
	11th to 20th	Night	2 12% 3 11% 9% 8% 6% 5% 6% 14% 24%	5110
	21st to end	Night	5% 12% 5% 12% 8% 7% 7% 5% 7% 10% 24%	5610
April	1st to 10th	Night	4 11% 4 9% 6% 5% 6% 4 7% 13% 32%	2121
	11th to 20th	Night	5% 10% 4 9% 5% 5% 6% 4 7% 9% 35%	1903
	21st to end	Night	4 10% 4 8% 6% 5% 5% 4 7% 10% 36%	1890
May	1st to 10th	Night	5% 8% 3 5% 3 3 4 3 6% 8% 50%	5321
	11th to 20th	Night	6% 7% 3 7% 4 4 4 4 5% 8% 48%	5296
	21st to end	Night	4 9% 2 6% 4 4 5% 4 6% 8% 48%	4988
June	1st to 10th	Night	9% 7% 2 5% 5% 5% 4 3 7% 8% 46%	1470
	11th to 20th	Night	8% 7% 2 6% 4 3 4 4 5% 6% 51%	1470
	21st to end	Night	5% 4 1 4 3 3 4 3 5% 7% 61%	1470
July	1st to 10th	Night	1 1 1 3 2 2 4 4 5% 6% 71%	3570
	11th to 20th	Night	1 1 1 3 2 2 3 3 4 6% 75%	3720
	21st to end	Night	3 4 1 3 3 4 5% 4 7% 8% 58%	4065
August	1st to 10th	Night	3 4 2 5% 3 3 4 4 7% 8% 58%	4033
	11th to 20th	Night	1 1 1 2 3 3 3 3 5% 6% 73%	4051
	21st to end	Night	7% 5% 2 4 3 2 3 3 4 6% 61%	4569
September	1st to 10th	Night	5% 3 1 3 2 3 3 3 4 6% 67%	2070
	11th to 20th	Night	6% 5% 2 5% 3 3 3 3 7% 8% 56%	2200
	21st to end	Night	5% 5% 1 5% 3 3 3 2 4 5% 63%	2200
October	1st to 10th	Night	4 4 1 4 3 3 4 3 5% 6% 63%	3653
	11th to 20th	Night	7% 8% 2 6% 3 4 4 3 4 6% 53%	3950
	21st to end	Night	7% 8% 3 7% 4 4 4 4 6% 9% 44%	4600
November	1st to 10th	Night	8% 11% 4 8% 5% 4 5% 4 7% 9% 37%	2665
	11th to 20th	Night	5% 11% 5% 9% 6% 6% 7% 6% 8% 8% 30%	2730
	21st to end	Night	4 9% 4 9% 6% 5% 6% 5% 8% 12% 35%	2940
December	1st to 10th	Night	3 6% 3 8% 7% 5% 6% 4 7% 9% 42%	4936
	11th to 20th	Night	3 13% 5% 13% 7% 7% 6% 5% 7% 10% 22%	5696
	21st to end	Night	3 13% 6% 17% 11% 10% 7% 5% 7% 7% 15%	7558

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	49% 19% 15% 14% 3	4723
	11th to 20th	Day	32% 9% 27% 18% 12% 2	4740
	21st to end	Day	34% 14% 18% 23% 11%	5225
February	1st to 10th	Day	50% 14% 16% 15% 5%	1890
	11th to 20th	Day	47% 15% 16% 14% 8% 1	1961
	21st to end	Day	47% 15% 14% 15% 7% 1	1730
March	1st to 10th	Day	34% 14% 19% 21% 11% 1	4634
	11th to 20th	Day	36% 11% 24% 23% 5%	5110
	21st to end	Day	48% 17% 19% 14% 2	5607
April	1st to 10th	Day	44% 13% 19% 18% 5%	2495
	11th to 20th	Day	39% 14% 17% 20% 9% 1	2668
	21st to end	Day	44% 12% 14% 22% 8%	2730
May	1st to 10th	Day	26% 11% 13% 30% 18% 2	7626
	11th to 20th	Day	32% 9% 12% 26% 18% 4	7599
	21st to end	Day	32% 10% 14% 28% 14% 2	9172
June	1st to 10th	Day	40% 12% 15% 23% 9% 1	3150
	11th to 20th	Day	35% 9% 10% 20% 20% 7%	3150
	21st to end	Day	24% 8% 8% 21% 30% 9%	3150
July	1st to 10th	Day	17% 6% 7% 16% 26% 29%	6535
	11th to 20th	Day	15% 5% 4 12% 32% 32%	6385
	21st to end	Day	22% 6% 7% 19% 26% 20%	6806
August	1st to 10th	Day	26% 8% 8% 18% 26% 14%	4208
	11th to 20th	Day	18% 6% 7% 25% 34% 10%	4197
	21st to end	Day	21% 5% 6% 21% 30% 17%	4614
September	1st to 10th	Day	20% 6% 8% 21% 29% 16%	2330
	11th to 20th	Day	28% 9% 10% 21% 24% 7%	2200
	21st to end	Day	25% 6% 11% 27% 26% 5%	2200
October	1st to 10th	Day	26% 6% 8% 22% 31% 8%	3544
	11th to 20th	Day	28% 7% 15% 28% 19% 3	3193
	21st to end	Day	31% 9% 12% 27% 19% 1	3200
November	1st to 10th	Day	39% 13% 14% 21% 12% 2	1854
	11th to 20th	Day	43% 12% 18% 18% 6% 2	1865
	21st to end	Day	38% 14% 17% 18% 10% 2	1680
December	1st to 10th	Day	35% 10% 27% 21% 6% 1	2462
	11th to 20th	Day	48% 13% 22% 12% 4	2714
	21st to end	Day	46% 14% 16% 15% 6% 4	3669
January	1st to 10th	Night	49% 19% 15% 14% 2	8172
	11th to 20th	Night	36% 12% 23% 18% 8% 3	8220
	21st to end	Night	33% 15% 18% 21% 10% 1	8955
February	1st to 10th	Night	55% 11% 15% 12% 5%	2730
	11th to 20th	Night	47% 14% 17% 15% 8%	2555
	21st to end	Night	45% 14% 14% 17% 8% 1	2076
March	1st to 10th	Night	33% 16% 20% 19% 11%	5479
	11th to 20th	Night	38% 11% 23% 21% 7%	5110
	21st to end	Night	43% 18% 22% 14% 3	5610
April	1st to 10th	Night	40% 12% 19% 21% 7% 1	2121
	11th to 20th	Night	39% 12% 19% 20% 9%	1903
	21st to end	Night	39% 11% 19% 24% 8%	1890
May	1st to 10th	Night	26% 10% 11% 36% 16% 1	5319
	11th to 20th	Night	28% 10% 11% 29% 19% 4	5297
	21st to end	Night	27% 10% 17% 30% 14% 1	4989
June	1st to 10th	Night	33% 11% 16% 28% 11% 1	1470
	11th to 20th	Night	32% 9% 12% 21% 20% 7%	1470
	21st to end	Night	21% 8% 9% 25% 27% 10%	1470
July	1st to 10th	Night	10% 5% 7% 24% 23% 30%	3530
	11th to 20th	Night	9% 4 4 17% 33% 33%	3672
	21st to end	Night	20% 5% 9% 23% 24% 19%	3952
August	1st to 10th	Night	21% 5% 7% 24% 29% 13%	2928
	11th to 20th	Night	11% 5% 7% 34% 31% 11%	2928
	21st to end	Night	18% 6% 6% 24% 32% 15%	3292
September	1st to 10th	Night	17% 5% 10% 23% 30% 15%	2070
	11th to 20th	Night	24% 7% 13% 23% 25% 8%	2200
	21st to end	Night	23% 6% 9% 29% 27% 7%	2200
October	1st to 10th	Night	19% 7% 8% 26% 32% 7%	3653
	11th to 20th	Night	30% 6% 15% 28% 20% 1	3950
	21st to end	Night	31% 8% 16% 28% 16% 1	4600
November	1st to 10th	Night	38% 11% 16% 23% 11% 2	2665
	11th to 20th	Night	42% 12% 18% 20% 6% 1	2730
	21st to end	Night	37% 11% 16% 22% 11% 3	2940
December	1st to 10th	Night	31% 11% 32% 20% 5% 1	4936
	11th to 20th	Night	48% 13% 22% 13% 3	5697
	21st to end	Night	52% 14% 15% 11% 5% 3	7558

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% 13% 35% 31% 13% 1	220
	11th to 20th	Day	5% 11% 40% 30% 10% 5%	220
	21st to end	Day	5% 10% 39% 33% 13%	249
February	1st to 10th	Day	6% 23% 44% 21% 5% 1	330
	11th to 20th	Day	3 21% 38% 29% 8% 1	437
	21st to end	Day	6% 20% 36% 30% 7%	446
March	1st to 10th	Day	7% 22% 40% 25% 5% 1	540
	11th to 20th	Day	8% 16% 39% 27% 9%	540
	21st to end	Day	7% 21% 39% 24% 8%	594
April	1st to 10th	Day	9% 21% 35% 24% 9% 3	540
	11th to 20th	Day	9% 25% 34% 23% 8% 1	532
	21st to end	Day	10% 23% 30% 26% 9% 2	540
May	1st to 10th	Day	9% 20% 29% 28% 12% 2	543
	11th to 20th	Day	14% 19% 30% 26% 10% 1	568
	21st to end	Day	11% 16% 25% 27% 17% 4	696
June	1st to 10th	Day	12% 13% 25% 31% 16% 3	780
	11th to 20th	Day	14% 17% 31% 26% 10% 1	780
	21st to end	Day	7% 10% 25% 37% 20% 2	780
July	1st to 10th	Day	4 10% 33% 33% 18% 2	632
	11th to 20th	Day	3 12% 37% 35% 12% 1	564
	21st to end	Day	5% 10% 32% 34% 16% 3	616
August	1st to 10th	Day	7% 8% 28% 37% 17% 3	527
	11th to 20th	Day	4 8% 28% 38% 19% 4	517
	21st to end	Day	6% 13% 27% 34% 16% 4	583
September	1st to 10th	Day	7% 11% 26% 28% 21% 7%	530
	11th to 20th	Day	9% 13% 27% 28% 18% 5%	530
	21st to end	Day	8% 16% 25% 29% 16% 5%	530
October	1st to 10th	Day	8% 14% 29% 26% 20% 2	500
	11th to 20th	Day	8% 17% 27% 27% 15% 6%	330
	21st to end	Day	7% 19% 34% 29% 9% 2	363
November	1st to 10th	Day	9% 16% 35% 28% 10% 1	330
	11th to 20th	Day	8% 14% 38% 29% 10% 1	330
	21st to end	Day	6% 13% 34% 38% 8% 1	330
December	1st to 10th	Day	7% 10% 38% 26% 15% 5%	253
	11th to 20th	Day	8% 17% 40% 30% 4 2	220
	21st to end	Day	7% 14% 38% 29% 12% 1	242
January	1st to 10th	Night	6% 11% 32% 39% 11% 1	840
	11th to 20th	Night	6% 11% 32% 36% 13% 3	840
	21st to end	Night	5% 6% 33% 39% 14% 2	924
February	1st to 10th	Night	5% 13% 40% 34% 8% 1	840
	11th to 20th	Night	6% 12% 35% 35% 10% 1	824
	21st to end	Night	6% 12% 34% 35% 12% 2	692
March	1st to 10th	Night	5% 10% 36% 37% 10% 1	840
	11th to 20th	Night	6% 12% 32% 34% 15% 1	840
	21st to end	Night	7% 11% 28% 41% 12%	924
April	1st to 10th	Night	6% 11% 28% 37% 16% 2	840
	11th to 20th	Night	9% 11% 35% 33% 12% 1	655
	21st to end	Night	9% 9% 27% 36% 17% 2	630
May	1st to 10th	Night	7% 10% 23% 39% 20% 2	630
	11th to 20th	Night	10% 8% 25% 31% 24% 2	621
	21st to end	Night	11% 6% 22% 34% 24% 3	473
June	1st to 10th	Night	9% 5% 17% 43% 24% 2	420
	11th to 20th	Night	11% 7% 29% 37% 16% 2	420
	21st to end	Night	6% 3 16% 47% 27% 1	420
July	1st to 10th	Night	2 3 12% 49% 33% 2	410
	11th to 20th	Night	2 1 14% 59% 23%	408
	21st to end	Night	2 2 11% 50% 34% 2	461
August	1st to 10th	Night	5% 4 18% 45% 28% 2	597
	11th to 20th	Night	2 2 15% 47% 32% 2	594
	21st to end	Night	6% 4 15% 44% 30% 1	681
September	1st to 10th	Night	6% 2 13% 42% 33% 4	800
	11th to 20th	Night	7% 4 12% 41% 30% 6%	800
	21st to end	Night	6% 6% 19% 37% 29% 4	800
October	1st to 10th	Night	8% 7% 21% 42% 22% 2	800
	11th to 20th	Night	9% 9% 22% 38% 19% 3	800
	21st to end	Night	8% 10% 27% 40% 12% 3	880
November	1st to 10th	Night	7% 10% 29% 39% 14%	820
	11th to 20th	Night	7% 14% 33% 36% 10% 1	840
	21st to end	Night	6% 11% 33% 35% 13% 2	1050
December	1st to 10th	Night	7% 11% 32% 38% 10% 2	1050
	11th to 20th	Night	8% 11% 36% 35% 9% 1	1050
	21st to end	Night	7% 14% 38% 30% 10% 1	1129

Page generated at 2026-07-28 01:25:19. Version ac07

Copyright © 2026 Attilla Danko.