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 2024-10-24.

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% 6% 5% 6% 8% 41%	101062
	Night	4 9% 4 9% 6% 6% 5% 4 6% 9% 37%	97849
Transparency	Day	34% 11% 13% 19% 15% 8%	100806
	Night	36% 11% 14% 20% 13% 6%	97695
Seeing	Day	8% 16% 33% 28% 13% 2	14967
	Night	7% 9% 26% 38% 18% 2	24375

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 10% 7% 16% 11% 10% 10% 6% 7% 8% 13%	2539
	11th to 20th	Day	2 11% 5% 13% 10% 6% 6% 4 7% 10% 25%	2540
	21st to end	Day	4 10% 6% 17% 10% 8% 7% 5% 8% 10% 14%	2804
February	1st to 10th	Day	3 12% 5% 12% 8% 7% 9% 6% 9% 9% 21%	1710
	11th to 20th	Day	2 11% 5% 10% 8% 7% 7% 6% 8% 9% 26%	1761
	21st to end	Day	2 12% 5% 12% 8% 9% 8% 5% 8% 10% 21%	1570
March	1st to 10th	Day	2 7% 5% 10% 7% 8% 8% 6% 8% 12% 28%	3154
	11th to 20th	Day	3 9% 3 9% 8% 7% 6% 5% 7% 10% 33%	3490
	21st to end	Day	3 13% 5% 13% 9% 7% 6% 6% 8% 9% 20%	3825
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	7% 7% 3 8% 5% 5% 4 4 6% 6% 44%	2062
	11th to 20th	Day	6% 7% 2 7% 4 4 4 4 6% 10% 46%	1867
	21st to end	Day	5% 9% 3 7% 5% 5% 5% 5% 6% 9% 40%	1809
November	1st to 10th	Day	6% 11% 4 8% 6% 4 5% 5% 7% 9% 36%	1674
	11th to 20th	Day	5% 12% 5% 9% 6% 5% 6% 4 8% 10% 31%	1688
	21st to end	Day	3 11% 3 10% 6% 5% 4 6% 9% 13% 29%	1520
December	1st to 10th	Day	4 11% 5% 11% 7% 9% 7% 5% 7% 9% 24%	1387
	11th to 20th	Day	3 12% 6% 14% 8% 8% 8% 4 8% 10% 18%	1685
	21st to end	Day	2 9% 5% 15% 11% 10% 9% 6% 7% 9% 17%	2506
January	1st to 10th	Night	2 13% 5% 16% 11% 13% 9% 5% 6% 7% 12%	4406
	11th to 20th	Night	4 15% 7% 17% 7% 6% 5% 5% 7% 9% 18%	4420
	21st to end	Night	4 13% 5% 19% 15% 9% 6% 5% 6% 7% 11%	4849
February	1st to 10th	Night	3 14% 7% 14% 9% 7% 7% 5% 7% 10% 18%	2470
	11th to 20th	Night	3 13% 4 13% 9% 7% 7% 6% 8% 11% 20%	2305
	21st to end	Night	1 12% 5% 14% 9% 7% 7% 6% 7% 11% 22%	1884
March	1st to 10th	Night	2 11% 4 11% 6% 9% 7% 5% 7% 11% 26%	3719
	11th to 20th	Night	2 10% 3 9% 9% 8% 5% 5% 7% 16% 28%	3490
	21st to end	Night	3 14% 5% 12% 8% 7% 7% 5% 7% 11% 21%	3828
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	6% 7% 2 5% 4 4 5% 3 6% 8% 50%	2117
	11th to 20th	Night	7% 9% 2 6% 3 3 4 3 5% 8% 49%	2308
	21st to end	Night	8% 8% 3 7% 5% 4 4 4 6% 9% 42%	2613
November	1st to 10th	Night	8% 11% 4 8% 5% 4 5% 4 7% 9% 37%	2405
	11th to 20th	Night	5% 11% 5% 8% 6% 6% 7% 6% 8% 8% 31%	2470
	21st to end	Night	4 9% 4 8% 5% 4 6% 6% 9% 12% 34%	2660
December	1st to 10th	Night	4 8% 4 11% 9% 7% 7% 6% 10% 11% 23%	2788
	11th to 20th	Night	4 13% 5% 12% 8% 8% 7% 5% 7% 12% 19%	3506
	21st to end	Night	3 12% 5% 17% 12% 10% 6% 5% 6% 7% 16%	5178

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	53% 18% 13% 12% 4	2539
	11th to 20th	Day	49% 9% 16% 13% 9% 3	2540
	21st to end	Day	53% 15% 13% 15% 4 1	2804
February	1st to 10th	Day	51% 14% 15% 15% 5%	1710
	11th to 20th	Day	47% 15% 16% 14% 8%	1770
	21st to end	Day	49% 16% 14% 13% 6% 1	1570
March	1st to 10th	Day	34% 17% 16% 21% 11%	3154
	11th to 20th	Day	32% 13% 27% 24% 4	3490
	21st to end	Day	51% 19% 17% 11% 2	3825
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	37% 9% 12% 23% 15% 4	2062
	11th to 20th	Day	32% 10% 15% 26% 14% 2	1867
	21st to end	Day	35% 12% 16% 24% 12% 1	1809
November	1st to 10th	Day	40% 13% 13% 20% 12% 2	1674
	11th to 20th	Day	44% 12% 17% 19% 7% 2	1688
	21st to end	Day	40% 13% 16% 17% 11% 3	1520
December	1st to 10th	Day	50% 11% 13% 14% 9% 2	1387
	11th to 20th	Day	48% 15% 19% 13% 4	1684
	21st to end	Day	45% 14% 14% 14% 8% 5%	2506
January	1st to 10th	Night	51% 17% 14% 14% 3	4406
	11th to 20th	Night	55% 11% 10% 14% 6% 4	4420
	21st to end	Night	56% 16% 12% 12% 4 1	4849
February	1st to 10th	Night	56% 11% 15% 12% 5%	2470
	11th to 20th	Night	48% 13% 17% 14% 8%	2306
	21st to end	Night	46% 14% 14% 16% 7% 2	1884
March	1st to 10th	Night	34% 18% 16% 21% 12%	3719
	11th to 20th	Night	31% 13% 26% 24% 6%	3490
	21st to end	Night	44% 19% 21% 14% 2	3828
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	29% 9% 13% 27% 19% 3	2117
	11th to 20th	Night	32% 7% 13% 30% 15% 2	2308
	21st to end	Night	34% 12% 16% 24% 14% 1	2613
November	1st to 10th	Night	39% 11% 15% 22% 11% 2	2405
	11th to 20th	Night	41% 13% 17% 21% 6% 1	2470
	21st to end	Night	37% 12% 14% 22% 12% 3	2660
December	1st to 10th	Night	44% 14% 19% 13% 7% 2	2788
	11th to 20th	Night	49% 13% 16% 16% 5%	3507
	21st to end	Night	50% 14% 13% 11% 7% 5%	5178

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	8% 13% 37% 27% 13% 2	180
	11th to 20th	Day	6% 13% 42% 24% 9% 5%	180
	21st to end	Day	6% 12% 44% 26% 11%	203
February	1st to 10th	Day	6% 25% 48% 17% 4 1	270
	11th to 20th	Day	3 23% 41% 24% 7% 1	366
	21st to end	Day	6% 23% 36% 27% 7% 1	382
March	1st to 10th	Day	7% 24% 42% 22% 5%	460
	11th to 20th	Day	7% 16% 40% 27% 10%	460
	21st to end	Day	5% 22% 42% 24% 7%	506
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% 22% 35% 26% 8% 1	306
November	1st to 10th	Day	11% 17% 35% 27% 9% 1	270
	11th to 20th	Day	8% 15% 39% 26% 11% 1	270
	21st to end	Day	7% 14% 37% 34% 7%	270
December	1st to 10th	Day	8% 11% 40% 22% 15% 3	207
	11th to 20th	Day	7% 18% 44% 24% 5% 2	180
	21st to end	Day	8% 14% 41% 24% 12% 2	198
January	1st to 10th	Night	6% 11% 32% 39% 12% 1	760
	11th to 20th	Night	6% 12% 31% 35% 13% 3	760
	21st to end	Night	6% 7% 32% 40% 14% 2	836
February	1st to 10th	Night	5% 13% 41% 33% 7% 1	760
	11th to 20th	Night	7% 12% 35% 35% 10% 1	744
	21st to end	Night	5% 12% 33% 35% 12% 2	628
March	1st to 10th	Night	6% 10% 36% 37% 11% 1	760
	11th to 20th	Night	5% 13% 28% 37% 16% 1	760
	21st to end	Night	7% 12% 26% 42% 13%	836
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	8% 11% 25% 40% 12% 3	804
November	1st to 10th	Night	8% 11% 28% 39% 14%	740
	11th to 20th	Night	7% 14% 33% 35% 10% 1	760
	21st to end	Night	7% 11% 31% 35% 14% 2	950
December	1st to 10th	Night	7% 10% 33% 39% 10% 2	950
	11th to 20th	Night	7% 11% 34% 36% 10% 1	950
	21st to end	Night	7% 15% 36% 30% 11% 1	1022

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