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 2025-03-27.

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 8% 3 8% 6% 5% 5% 4 6% 8% 42%	112227
	Night	4 9% 3 9% 6% 6% 5% 4 6% 9% 38%	115822
Transparency	Day	33% 11% 13% 19% 15% 8%	111971
	Night	35% 11% 15% 20% 13% 5%	115668
Seeing	Day	8% 16% 33% 29% 13% 2	15412
	Night	7% 9% 27% 38% 18% 2	25032

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 9% 7% 15% 10% 10% 9% 6% 8% 9% 15%	3639
	11th to 20th	Day	1 8% 4 11% 9% 7% 6% 5% 7% 12% 32%	3640
	21st to end	Day	3 7% 4 12% 8% 7% 6% 5% 7% 10% 30%	4028
February	1st to 10th	Day	3 12% 5% 12% 8% 7% 9% 6% 9% 9% 21%	1800
	11th to 20th	Day	2 11% 6% 11% 8% 7% 7% 6% 8% 9% 26%	1857
	21st to end	Day	2 12% 5% 12% 8% 9% 7% 5% 8% 10% 22%	1650
March	1st to 10th	Day	2 7% 5% 10% 7% 8% 8% 6% 8% 12% 28%	3254
	11th to 20th	Day	3 9% 3 9% 8% 7% 6% 5% 7% 9% 33%	3600
	21st to end	Day	4 13% 5% 13% 9% 7% 6% 6% 8% 9% 20%	3892
April	1st to 10th	Day	4 11% 4 11% 7% 7% 7% 5% 8% 9% 28%	2257
	11th to 20th	Day	4 9% 4 9% 6% 6% 7% 5% 7% 9% 35%	2408
	21st to end	Day	5% 11% 4 10% 6% 6% 6% 5% 6% 8% 32%	2470
May	1st to 10th	Day	4 12% 4 9% 6% 5% 6% 5% 8% 9% 32%	4110
	11th to 20th	Day	4 6% 3 7% 4 5% 5% 4 6% 9% 48%	4071
	21st to end	Day	7% 12% 4 9% 5% 5% 5% 4 6% 7% 36%	4905
June	1st to 10th	Day	10% 8% 3 7% 7% 5% 6% 5% 7% 8% 34%	2850
	11th to 20th	Day	10% 7% 3 6% 5% 4 4 4 6% 7% 44%	2850
	21st to end	Day	3 4 2 5% 4 4 4 4 5% 7% 59%	2850
July	1st to 10th	Day	2 2 1 3 3 3 4 4 4 5% 69%	4519
	11th to 20th	Day	3 3 1 3 3 3 4 3 5% 7% 64%	4420
	21st to end	Day	4 4 1 4 3 4 5% 4 5% 6% 61%	4774
August	1st to 10th	Day	5% 4 2 6% 4 6% 5% 4 7% 7% 49%	4092
	11th to 20th	Day	2 2 1 4 3 5% 4 5% 5% 7% 62%	4028
	21st to end	Day	3 5% 2 4 3 3 3 3 4 5% 65%	4473
September	1st to 10th	Day	5% 3 1 4 3 3 4 3 4 6% 64%	2214
	11th to 20th	Day	6% 7% 2 5% 5% 3 5% 3 5% 6% 53%	2090
	21st to end	Day	7% 6% 2 4 4 3 2 3 4 8% 57%	2090
October	1st to 10th	Day	5% 6% 2 6% 3 3 3 3 4 5% 60%	3436
	11th to 20th	Day	4 7% 2 6% 3 4 3 4 6% 9% 52%	3095
	21st to end	Day	4 7% 3 8% 5% 5% 5% 4 6% 7% 44%	3101
November	1st to 10th	Day	6% 10% 4 9% 5% 4 5% 5% 7% 9% 37%	1764
	11th to 20th	Day	5% 12% 5% 9% 6% 5% 6% 4 8% 10% 30%	1776
	21st to end	Day	3 10% 4 10% 7% 5% 4 6% 9% 13% 30%	1600
December	1st to 10th	Day	2 7% 3 9% 6% 7% 6% 4 5% 7% 44%	2389
	11th to 20th	Day	3 12% 6% 15% 8% 7% 7% 4 7% 9% 20%	2645
	21st to end	Day	2 11% 5% 15% 11% 9% 9% 6% 7% 9% 17%	3590
January	1st to 10th	Night	2 11% 5% 14% 10% 12% 9% 6% 8% 8% 13%	6306
	11th to 20th	Night	3 11% 5% 15% 8% 7% 6% 5% 7% 9% 24%	6320
	21st to end	Night	2 9% 4 13% 11% 7% 5% 4 8% 11% 25%	6926
February	1st to 10th	Night	3 14% 7% 14% 9% 7% 7% 5% 7% 9% 17%	2600
	11th to 20th	Night	2 13% 4 13% 9% 7% 7% 6% 8% 11% 20%	2429
	21st to end	Night	2 12% 5% 14% 8% 7% 7% 6% 7% 10% 23%	1980
March	1st to 10th	Night	1 11% 4 11% 6% 9% 7% 5% 7% 11% 27%	3839
	11th to 20th	Night	2 10% 3 9% 9% 8% 5% 5% 6% 16% 28%	3600
	21st to end	Night	4 14% 5% 12% 8% 7% 7% 5% 7% 11% 21%	3899
April	1st to 10th	Night	4 11% 4 9% 5% 5% 6% 4 7% 14% 30%	1919
	11th to 20th	Night	5% 10% 4 9% 5% 5% 6% 4 7% 10% 34%	1720
	21st to end	Night	5% 10% 4 8% 6% 5% 5% 4 7% 10% 36%	1710
May	1st to 10th	Night	9% 13% 4 7% 4 4 5% 4 7% 10% 36%	2860
	11th to 20th	Night	5% 6% 2 6% 4 4 3 4 5% 8% 52%	2834
	21st to end	Night	6% 12% 3 7% 4 4 5% 5% 7% 8% 39%	2653
June	1st to 10th	Night	9% 8% 2 5% 5% 5% 4 3 7% 9% 43%	1330
	11th to 20th	Night	9% 7% 2 6% 4 4 4 4 5% 6% 49%	1330
	21st to end	Night	4 4 1 4 3 3 3 3 5% 7% 63%	1330
July	1st to 10th	Night	2 1 1 3 2 2 3 3 4 6% 74%	2435
	11th to 20th	Night	2 2 1 3 2 3 3 4 5% 7% 69%	2540
	21st to end	Night	2 2 1 3 2 3 3 3 4 6% 70%	2776
August	1st to 10th	Night	3 4 2 5% 4 3 4 5% 6% 7% 57%	2847
	11th to 20th	Night	1 2 1 2 3 3 3 3 6% 6% 70%	2811
	21st to end	Night	4 2 1 4 4 3 3 3 4 6% 65%	3192
September	1st to 10th	Night	5% 3 1 3 2 3 3 3 4 6% 67%	1966
	11th to 20th	Night	6% 5% 2 6% 3 3 3 3 7% 7% 56%	2090
	21st to end	Night	5% 5% 1 4 3 3 3 2 4 5% 62%	2090
October	1st to 10th	Night	3 4 1 4 3 3 4 3 5% 6% 64%	3541
	11th to 20th	Night	7% 8% 2 6% 3 3 4 3 4 6% 54%	3828
	21st to end	Night	8% 8% 3 7% 4 4 4 4 6% 9% 43%	4457
November	1st to 10th	Night	7% 11% 4 8% 5% 4 5% 4 7% 9% 37%	2535
	11th to 20th	Night	5% 11% 5% 9% 6% 6% 7% 6% 8% 8% 30%	2600
	21st to end	Night	4 9% 4 8% 5% 4 6% 5% 8% 12% 34%	2800
December	1st to 10th	Night	3 5% 3 8% 7% 5% 5% 4 7% 9% 43%	4789
	11th to 20th	Night	3 14% 5% 14% 8% 7% 6% 5% 7% 10% 21%	5546
	21st to end	Night	3 13% 6% 17% 11% 10% 7% 5% 7% 7% 14%	7394

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% 14% 15% 3	3639
	11th to 20th	Day	41% 11% 19% 17% 10% 2	3640
	21st to end	Day	38% 13% 15% 22% 10% 1	4028
February	1st to 10th	Day	52% 14% 14% 15% 5%	1800
	11th to 20th	Day	47% 15% 15% 14% 8% 1	1866
	21st to end	Day	48% 16% 14% 14% 6% 1	1650
March	1st to 10th	Day	34% 17% 16% 21% 11%	3254
	11th to 20th	Day	32% 13% 27% 24% 4	3600
	21st to end	Day	51% 19% 17% 11% 2	3892
April	1st to 10th	Day	47% 14% 19% 15% 5% 1	2257
	11th to 20th	Day	40% 14% 18% 19% 8% 1	2411
	21st to end	Day	45% 13% 15% 21% 7%	2470
May	1st to 10th	Day	40% 15% 15% 21% 8% 1	4110
	11th to 20th	Day	28% 11% 15% 29% 11% 5%	4074
	21st to end	Day	40% 14% 16% 22% 6% 1	4906
June	1st to 10th	Day	42% 13% 17% 22% 7%	2850
	11th to 20th	Day	37% 10% 10% 19% 18% 7%	2850
	21st to end	Day	22% 9% 8% 22% 29% 10%	2850
July	1st to 10th	Day	14% 6% 7% 12% 26% 35%	4450
	11th to 20th	Day	16% 5% 5% 10% 25% 38%	4345
	21st to end	Day	20% 5% 6% 13% 27% 29%	4623
August	1st to 10th	Day	27% 8% 8% 17% 26% 14%	4078
	11th to 20th	Day	18% 6% 7% 25% 34% 9%	4067
	21st to end	Day	20% 5% 6% 21% 31% 17%	4472
September	1st to 10th	Day	20% 6% 8% 20% 29% 17%	2214
	11th to 20th	Day	29% 9% 10% 21% 24% 7%	2090
	21st to end	Day	26% 6% 11% 27% 26% 5%	2090
October	1st to 10th	Day	26% 6% 8% 22% 31% 8%	3436
	11th to 20th	Day	27% 8% 15% 27% 20% 3	3095
	21st to end	Day	31% 10% 12% 27% 20% 1	3101
November	1st to 10th	Day	40% 13% 13% 21% 12% 2	1764
	11th to 20th	Day	44% 12% 17% 19% 7% 2	1776
	21st to end	Day	39% 13% 17% 18% 10% 2	1600
December	1st to 10th	Day	34% 9% 27% 22% 7% 1	2389
	11th to 20th	Day	48% 14% 22% 12% 4	2644
	21st to end	Day	46% 14% 16% 15% 6% 4	3590
January	1st to 10th	Night	49% 18% 15% 15% 3	6306
	11th to 20th	Night	46% 14% 14% 16% 7% 3	6320
	21st to end	Night	40% 14% 16% 19% 10% 1	6926
February	1st to 10th	Night	57% 11% 14% 12% 6%	2600
	11th to 20th	Night	47% 14% 17% 14% 8%	2430
	21st to end	Night	46% 14% 15% 16% 8% 2	1980
March	1st to 10th	Night	33% 18% 16% 21% 12%	3839
	11th to 20th	Night	31% 13% 26% 23% 6%	3600
	21st to end	Night	43% 19% 21% 14% 2	3899
April	1st to 10th	Night	41% 12% 18% 21% 7% 1	1919
	11th to 20th	Night	40% 13% 18% 20% 9%	1720
	21st to end	Night	39% 11% 19% 23% 8%	1710
May	1st to 10th	Night	39% 13% 14% 27% 7%	2860
	11th to 20th	Night	25% 12% 15% 32% 13% 3	2835
	21st to end	Night	36% 14% 18% 26% 6%	2653
June	1st to 10th	Night	35% 12% 17% 27% 8% 1	1330
	11th to 20th	Night	33% 9% 12% 21% 18% 6%	1330
	21st to end	Night	20% 8% 9% 25% 28% 11%	1330
July	1st to 10th	Night	10% 5% 7% 16% 25% 37%	2395
	11th to 20th	Night	12% 5% 6% 14% 23% 41%	2492
	21st to end	Night	15% 4 5% 19% 30% 27%	2689
August	1st to 10th	Night	22% 5% 7% 23% 29% 14%	2838
	11th to 20th	Night	11% 6% 7% 35% 31% 10%	2838
	21st to end	Night	17% 6% 6% 24% 33% 15%	3192
September	1st to 10th	Night	17% 5% 10% 22% 30% 16%	1966
	11th to 20th	Night	25% 7% 13% 22% 24% 8%	2090
	21st to end	Night	23% 6% 9% 30% 25% 7%	2090
October	1st to 10th	Night	19% 6% 8% 25% 33% 8%	3541
	11th to 20th	Night	30% 6% 15% 28% 20% 1	3828
	21st to end	Night	32% 9% 16% 27% 16% 1	4457
November	1st to 10th	Night	39% 11% 15% 23% 11% 2	2535
	11th to 20th	Night	42% 13% 18% 21% 6% 1	2600
	21st to end	Night	37% 11% 15% 22% 12% 3	2800
December	1st to 10th	Night	30% 11% 33% 20% 5% 1	4789
	11th to 20th	Night	48% 13% 23% 13% 3	5547
	21st to end	Night	52% 14% 14% 11% 5% 4	7394

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% 36% 31% 13% 2	200
	11th to 20th	Day	6% 12% 41% 28% 9% 5%	200
	21st to end	Day	5% 11% 42% 28% 13%	226
February	1st to 10th	Day	6% 24% 47% 18% 4 1	300
	11th to 20th	Day	3 22% 38% 28% 8% 1	402
	21st to end	Day	6% 21% 35% 30% 8%	414
March	1st to 10th	Day	7% 23% 40% 25% 5% 1	500
	11th to 20th	Day	7% 15% 39% 29% 10%	500
	21st to end	Day	6% 21% 41% 24% 8%	531
April	1st to 10th	Day	10% 22% 37% 22% 7% 1	460
	11th to 20th	Day	9% 27% 34% 21% 7% 1	452
	21st to end	Day	10% 25% 31% 24% 9% 2	460
May	1st to 10th	Day	9% 22% 31% 27% 10% 1	463
	11th to 20th	Day	15% 18% 29% 26% 11% 1	488
	21st to end	Day	12% 17% 26% 25% 16% 4	600
June	1st to 10th	Day	13% 13% 25% 30% 16% 3	680
	11th to 20th	Day	15% 18% 30% 24% 11% 1	680
	21st to end	Day	6% 11% 26% 36% 20% 2	680
July	1st to 10th	Day	4 11% 34% 34% 16% 2	546
	11th to 20th	Day	4 13% 37% 33% 12% 1	484
	21st to end	Day	5% 11% 32% 35% 14% 2	531
August	1st to 10th	Day	8% 7% 29% 37% 16% 3	487
	11th to 20th	Day	4 8% 27% 38% 18% 4	477
	21st to end	Day	6% 14% 28% 34% 14% 4	539
September	1st to 10th	Day	7% 11% 27% 29% 20% 5%	490
	11th to 20th	Day	10% 14% 28% 29% 16% 4	490
	21st to end	Day	9% 17% 25% 30% 16% 3	490
October	1st to 10th	Day	8% 15% 28% 26% 21% 2	462
	11th to 20th	Day	8% 17% 26% 26% 16% 7%	300
	21st to end	Day	8% 20% 35% 28% 8% 1	330
November	1st to 10th	Day	10% 16% 34% 29% 10% 1	300
	11th to 20th	Day	8% 14% 41% 26% 10% 1	300
	21st to end	Day	7% 13% 36% 36% 8% 1	300
December	1st to 10th	Day	7% 10% 37% 24% 17% 5%	230
	11th to 20th	Day	6% 17% 44% 27% 5% 2	200
	21st to end	Day	8% 13% 40% 27% 11% 1	220
January	1st to 10th	Night	5% 11% 32% 39% 12% 1	800
	11th to 20th	Night	6% 12% 32% 35% 13% 3	800
	21st to end	Night	6% 7% 32% 40% 14% 2	880
February	1st to 10th	Night	5% 14% 41% 33% 7% 1	800
	11th to 20th	Night	7% 12% 35% 36% 10% 1	784
	21st to end	Night	5% 12% 33% 35% 12% 2	660
March	1st to 10th	Night	6% 10% 35% 37% 11% 1	800
	11th to 20th	Night	5% 13% 30% 36% 16% 1	800
	21st to end	Night	7% 12% 26% 42% 12%	862
April	1st to 10th	Night	7% 11% 28% 36% 16% 2	760
	11th to 20th	Night	8% 11% 35% 32% 12% 1	592
	21st to end	Night	9% 9% 27% 35% 17% 2	570
May	1st to 10th	Night	7% 10% 23% 38% 20% 2	570
	11th to 20th	Night	10% 8% 24% 30% 26% 2	561
	21st to end	Night	12% 7% 22% 33% 23% 3	427
June	1st to 10th	Night	10% 4 16% 43% 24% 2	380
	11th to 20th	Night	12% 7% 26% 36% 17% 2	380
	21st to end	Night	4 3 17% 46% 29% 2	380
July	1st to 10th	Night	2 3 12% 46% 35% 3	370
	11th to 20th	Night	2 1 14% 58% 25%	368
	21st to end	Night	2 1 11% 49% 35% 2	419
August	1st to 10th	Night	5% 3 17% 44% 29% 2	567
	11th to 20th	Night	2 2 16% 46% 32% 2	564
	21st to end	Night	6% 4 15% 44% 30% 2	647
September	1st to 10th	Night	6% 2 14% 42% 33% 4	760
	11th to 20th	Night	7% 4 12% 41% 29% 6%	760
	21st to end	Night	6% 6% 19% 37% 28% 4	760
October	1st to 10th	Night	8% 7% 21% 42% 22% 2	760
	11th to 20th	Night	9% 9% 20% 39% 19% 4	760
	21st to end	Night	9% 11% 26% 40% 12% 3	836
November	1st to 10th	Night	8% 10% 28% 40% 14%	780
	11th to 20th	Night	7% 14% 33% 35% 10% 1	800
	21st to end	Night	6% 11% 32% 35% 14% 2	1000
December	1st to 10th	Night	7% 10% 32% 39% 11% 2	1000
	11th to 20th	Night	7% 11% 35% 36% 10% 1	1000
	21st to end	Night	7% 15% 37% 30% 10% 1	1075

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