Cripple Creek KOA
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Cripple Creek KOA clear sky chart from 2005-11-06 to 2026-10-14.

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	3 6% 3 7% 5% 5% 5% 4 6% 8% 47%	157902
	Night	2 5% 2 6% 4 4 4 4 6% 8% 55%	151395
Transparency	Day	30% 6% 10% 22% 22% 10%	152881
	Night	26% 5% 11% 25% 25% 9%	147436
Seeing	Day	16% 22% 30% 21% 9% 2	18176
	Night	10% 20% 29% 27% 13% 2	28116

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	4 4 10% 4 3 4 3 6% 8% 56%	4720
	11th to 20th	Day	2 1 6% 6% 6% 5% 3 5% 7% 60%	5039
	21st to end	Day	6% 3 7% 3 5% 4 3 4 6% 57%	5844
February	1st to 10th	Day	1 7% 4 7% 4 3 3 3 7% 7% 54%	1890
	11th to 20th	Day	3 2 7% 5% 4 5% 3 6% 9% 56%	2049
	21st to end	Day	1 6% 4 6% 3 4 3 3 5% 7% 57%	1730
March	1st to 10th	Day	1 6% 4 7% 5% 4 3 3 5% 6% 56%	4600
	11th to 20th	Day	1 8% 4 14% 7% 5% 5% 3 5% 6% 40%	5063
	21st to end	Day	1 7% 4 8% 5% 5% 5% 5% 7% 9% 46%	5938
April	1st to 10th	Day	3 8% 3 8% 6% 6% 5% 4 6% 8% 45%	2520
	11th to 20th	Day	4 11% 3 9% 6% 4 4 4 6% 6% 43%	2491
	21st to end	Day	5% 12% 4 8% 6% 5% 5% 4 6% 8% 37%	2520
May	1st to 10th	Day	4 14% 3 7% 5% 6% 5% 5% 6% 8% 38%	7313
	11th to 20th	Day	4 8% 3 7% 5% 5% 6% 5% 6% 8% 43%	8053
	21st to end	Day	4 6% 2 7% 5% 5% 6% 5% 7% 9% 44%	9026
June	1st to 10th	Day	5% 6% 2 7% 5% 6% 6% 6% 8% 9% 41%	2940
	11th to 20th	Day	4 5% 2 5% 4 5% 5% 6% 7% 8% 50%	2940
	21st to end	Day	4 5% 2 6% 5% 6% 7% 5% 8% 8% 44%	2940
July	1st to 10th	Day	3 3 2 5% 5% 5% 6% 6% 7% 9% 48%	8249
	11th to 20th	Day	4 5% 3 7% 6% 6% 7% 5% 8% 10% 40%	8250
	21st to end	Day	6% 6% 3 8% 7% 6% 7% 5% 8% 9% 36%	8624
August	1st to 10th	Day	5% 5% 3 7% 6% 7% 7% 6% 8% 9% 38%	7463
	11th to 20th	Day	4 4 2 7% 6% 7% 7% 6% 9% 10% 38%	7003
	21st to end	Day	6% 7% 3 9% 6% 6% 7% 6% 8% 10% 32%	7751
September	1st to 10th	Day	7% 5% 2 7% 5% 4 5% 4 7% 7% 48%	2520
	11th to 20th	Day	6% 4 2 6% 5% 5% 5% 4 5% 6% 52%	2495
	21st to end	Day	7% 6% 3 5% 3 4 3 3 4 6% 56%	2310
October	1st to 10th	Day	4 3 1 4 3 3 3 3 4 5% 68%	3403
	11th to 20th	Day	3 6% 2 7% 5% 4 4 3 5% 6% 54%	3280
	21st to end	Day	2 5% 2 4 3 3 3 3 4 5% 66%	3465
November	1st to 10th	Day	1 5% 2 4 2 3 4 3 5% 7% 64%	1853
	11th to 20th	Day	1 4 2 5% 4 4 3 3 5% 8% 63%	1890
	21st to end	Day	1 5% 2 6% 4 4 4 4 4 8% 58%	1832
December	1st to 10th	Day	3 3 6% 3 2 3 2 3 7% 68%	2700
	11th to 20th	Day	4 2 5% 4 3 3 3 6% 7% 63%	3106
	21st to end	Day	4 2 7% 5% 5% 5% 4 7% 8% 52%	4092
January	1st to 10th	Night	2 3 11% 4 4 4 3 5% 8% 56%	8201
	11th to 20th	Night	2 1 5% 5% 5% 3 3 4 6% 65%	7996
	21st to end	Night	3 2 7% 4 3 3 3 4 5% 65%	8370
February	1st to 10th	Night	5% 3 6% 4 3 4 3 5% 8% 60%	2728
	11th to 20th	Night	1 5% 2 9% 5% 4 4 4 5% 7% 56%	2458
	21st to end	Night	5% 2 6% 3 3 4 2 3 8% 64%	2076
March	1st to 10th	Night	6% 3 7% 4 4 4 3 5% 6% 57%	5494
	11th to 20th	Night	1 5% 4 8% 5% 4 4 3 5% 8% 52%	5138
	21st to end	Night	1 5% 3 6% 4 4 5% 3 5% 8% 55%	5264
April	1st to 10th	Night	2 7% 3 6% 4 4 3 3 5% 7% 56%	2100
	11th to 20th	Night	4 9% 3 8% 4 5% 3 3 5% 7% 50%	2077
	21st to end	Night	5% 10% 3 6% 4 4 4 4 6% 8% 46%	2100
May	1st to 10th	Night	4 10% 3 7% 5% 5% 5% 3 5% 7% 45%	5617
	11th to 20th	Night	5% 7% 2 6% 4 4 4 4 6% 8% 50%	4823
	21st to end	Night	6% 8% 3 7% 4 4 4 4 5% 6% 49%	5181
June	1st to 10th	Night	4 5% 2 6% 5% 4 4 4 7% 9% 51%	1680
	11th to 20th	Night	3 4 1 4 3 3 5% 4 6% 8% 59%	1680
	21st to end	Night	4 5% 2 6% 5% 5% 5% 5% 6% 7% 50%	1680
July	1st to 10th	Night	3 4 2 5% 4 4 5% 4 6% 7% 55%	4740
	11th to 20th	Night	3 4 2 5% 4 5% 5% 5% 7% 10% 51%	4740
	21st to end	Night	4 5% 2 7% 6% 7% 7% 7% 9% 10% 37%	5481
August	1st to 10th	Night	5% 5% 2 6% 4 5% 5% 5% 7% 9% 45%	5345
	11th to 20th	Night	4 4 2 7% 5% 6% 6% 5% 8% 10% 42%	5853
	21st to end	Night	5% 6% 2 7% 5% 6% 7% 6% 10% 11% 34%	6465
September	1st to 10th	Night	6% 5% 3 6% 5% 5% 5% 4 6% 7% 49%	2100
	11th to 20th	Night	6% 4 2 5% 4 3 4 3 6% 7% 56%	2123
	21st to end	Night	5% 6% 2 5% 4 4 4 3 5% 6% 57%	2310
October	1st to 10th	Night	3 3 1 3 2 3 3 2 3 5% 71%	4001
	11th to 20th	Night	3 4 2 6% 3 3 4 4 5% 6% 60%	3934
	21st to end	Night	3 4 2 3 2 3 3 3 4 5% 69%	4301
November	1st to 10th	Night	1 5% 2 3 3 3 3 3 5% 8% 65%	2665
	11th to 20th	Night	3 1 4 4 4 4 3 4 7% 66%	2730
	21st to end	Night	1 6% 2 5% 4 3 4 3 5% 7% 60%	2785
December	1st to 10th	Night	1 2 1 4 3 3 3 3 5% 7% 70%	4710
	11th to 20th	Night	3 1 5% 3 3 3 3 5% 9% 63%	5321
	21st to end	Night	5% 3 8% 4 4 4 4 6% 7% 54%	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	27% 3 7% 30% 24% 9%	4723
	11th to 20th	Day	23% 4 8% 24% 28% 13%	5039
	21st to end	Day	27% 4 8% 23% 24% 14%	5844
February	1st to 10th	Day	28% 3 10% 26% 22% 12%	1890
	11th to 20th	Day	24% 5% 7% 26% 29% 10%	2059
	21st to end	Day	27% 2 5% 20% 29% 17%	1730
March	1st to 10th	Day	26% 3 5% 17% 30% 18%	4600
	11th to 20th	Day	41% 4 6% 25% 19% 6%	5063
	21st to end	Day	32% 5% 10% 33% 17% 3	5938
April	1st to 10th	Day	35% 4 9% 21% 22% 9%	2520
	11th to 20th	Day	40% 4 6% 23% 20% 8%	2494
	21st to end	Day	42% 5% 8% 23% 19% 4	2520
May	1st to 10th	Day	39% 7% 10% 23% 15% 7%	7313
	11th to 20th	Day	34% 7% 10% 21% 21% 6%	8057
	21st to end	Day	32% 8% 11% 22% 20% 8%	9027
June	1st to 10th	Day	34% 6% 14% 21% 18% 7%	2940
	11th to 20th	Day	28% 6% 9% 19% 24% 15%	2940
	21st to end	Day	33% 6% 9% 22% 20% 10%	2940
July	1st to 10th	Day	22% 10% 11% 14% 22% 21%	8181
	11th to 20th	Day	29% 10% 15% 21% 15% 10%	8175
	21st to end	Day	37% 12% 18% 14% 11% 7%	8433
August	1st to 10th	Day	35% 10% 15% 18% 16% 7%	5914
	11th to 20th	Day	33% 14% 17% 16% 14% 7%	5519
	21st to end	Day	37% 11% 18% 18% 14% 3	6078
September	1st to 10th	Day	31% 4 10% 22% 23% 9%	2520
	11th to 20th	Day	30% 4 8% 19% 27% 11%	2495
	21st to end	Day	28% 3 5% 25% 29% 9%	2310
October	1st to 10th	Day	18% 3 6% 22% 34% 17%	3403
	11th to 20th	Day	25% 7% 10% 26% 24% 8%	3280
	21st to end	Day	19% 4 4 24% 39% 9%	3465
November	1st to 10th	Day	21% 3 7% 22% 33% 14%	1853
	11th to 20th	Day	21% 2 5% 32% 29% 11%	1890
	21st to end	Day	24% 4 7% 23% 29% 13%	1832
December	1st to 10th	Day	18% 3 9% 30% 30% 10%	2700
	11th to 20th	Day	19% 3 9% 29% 30% 9%	3104
	21st to end	Day	27% 3 8% 24% 26% 12%	4092
January	1st to 10th	Night	27% 2 6% 31% 28% 6%	8202
	11th to 20th	Night	20% 3 7% 27% 25% 18%	7996
	21st to end	Night	21% 4 9% 20% 31% 16%	8370
February	1st to 10th	Night	23% 2 9% 30% 25% 11%	2728
	11th to 20th	Night	28% 4 8% 28% 24% 8%	2458
	21st to end	Night	22% 3 3 25% 31% 15%	2076
March	1st to 10th	Night	25% 5% 5% 15% 36% 14%	5494
	11th to 20th	Night	30% 3 7% 24% 29% 8%	5138
	21st to end	Night	26% 5% 11% 38% 18% 2	5264
April	1st to 10th	Night	27% 4 10% 28% 25% 7%	2100
	11th to 20th	Night	34% 2 8% 27% 23% 6%	2077
	21st to end	Night	35% 4 11% 28% 18% 4	2100
May	1st to 10th	Night	35% 7% 10% 30% 12% 6%	5615
	11th to 20th	Night	29% 5% 11% 30% 21% 4	4824
	21st to end	Night	34% 6% 12% 20% 22% 6%	5182
June	1st to 10th	Night	29% 3 19% 23% 15% 10%	1680
	11th to 20th	Night	22% 5% 10% 24% 23% 16%	1680
	21st to end	Night	32% 5% 8% 22% 20% 12%	1680
July	1st to 10th	Night	24% 7% 9% 18% 29% 14%	4700
	11th to 20th	Night	23% 8% 17% 26% 19% 6%	4692
	21st to end	Night	35% 11% 18% 19% 11% 7%	5360
August	1st to 10th	Night	35% 9% 17% 23% 11% 4	4229
	11th to 20th	Night	33% 13% 23% 16% 12% 3	4613
	21st to end	Night	32% 12% 26% 16% 12% 2	5069
September	1st to 10th	Night	32% 4 11% 25% 21% 7%	2100
	11th to 20th	Night	25% 4 11% 22% 26% 12%	2123
	21st to end	Night	26% 4 7% 27% 28% 7%	2310
October	1st to 10th	Night	17% 4 8% 25% 36% 11%	4001
	11th to 20th	Night	23% 7% 11% 27% 24% 8%	3934
	21st to end	Night	17% 3 5% 28% 35% 12%	4301
November	1st to 10th	Night	19% 2 9% 25% 32% 13%	2665
	11th to 20th	Night	18% 3 6% 31% 30% 11%	2730
	21st to end	Night	23% 3 8% 25% 29% 12%	2785
December	1st to 10th	Night	15% 3 9% 34% 30% 9%	4710
	11th to 20th	Night	19% 3 7% 28% 34% 8%	5322
	21st to end	Night	28% 3 10% 21% 27% 11%	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	23% 25% 29% 16% 6% 1	330
	11th to 20th	Day	21% 31% 31% 14% 2 1	330
	21st to end	Day	14% 34% 30% 16% 6% 1	363
February	1st to 10th	Day	22% 42% 25% 9% 1 1	330
	11th to 20th	Day	24% 39% 26% 9% 2 1	330
	21st to end	Day	31% 30% 29% 10% 1	273
March	1st to 10th	Day	22% 32% 29% 13% 5%	330
	11th to 20th	Day	26% 26% 32% 11% 5% 1	519
	21st to end	Day	24% 34% 30% 8% 2 1	594
April	1st to 10th	Day	23% 34% 30% 10% 2 1	540
	11th to 20th	Day	30% 33% 26% 8% 2	532
	21st to end	Day	27% 28% 31% 12% 2	540
May	1st to 10th	Day	20% 28% 31% 16% 4 1	632
	11th to 20th	Day	17% 18% 33% 22% 8% 2	775
	21st to end	Day	15% 21% 28% 24% 10% 2	844
June	1st to 10th	Day	10% 16% 31% 25% 14% 3	780
	11th to 20th	Day	10% 19% 34% 24% 10% 3	780
	21st to end	Day	9% 18% 31% 23% 13% 5%	780
July	1st to 10th	Day	9% 12% 24% 31% 20% 5%	771
	11th to 20th	Day	8% 7% 25% 33% 21% 7%	768
	21st to end	Day	9% 7% 23% 34% 22% 5%	734
August	1st to 10th	Day	12% 11% 30% 30% 14% 3	567
	11th to 20th	Day	9% 9% 33% 30% 14% 4	557
	21st to end	Day	10% 14% 30% 31% 13% 3	627
September	1st to 10th	Day	10% 13% 35% 26% 12% 4	570
	11th to 20th	Day	10% 20% 36% 22% 9% 3	545
	21st to end	Day	14% 17% 25% 27% 13% 4	360
October	1st to 10th	Day	11% 20% 28% 23% 13% 6%	360
	11th to 20th	Day	19% 27% 27% 17% 7% 3	339
	21st to end	Day	14% 29% 31% 18% 6% 1	363
November	1st to 10th	Day	16% 31% 28% 18% 6% 2	330
	11th to 20th	Day	16% 29% 33% 15% 5% 1	330
	21st to end	Day	15% 27% 35% 17% 6% 1	330
December	1st to 10th	Day	22% 28% 28% 17% 5% 1	330
	11th to 20th	Day	20% 37% 27% 11% 5% 1	330
	21st to end	Day	21% 35% 28% 11% 5%	363
January	1st to 10th	Night	12% 27% 30% 21% 8% 2	1050
	11th to 20th	Night	12% 31% 29% 19% 8% 2	965
	21st to end	Night	7% 28% 35% 23% 6% 1	924
February	1st to 10th	Night	7% 35% 38% 15% 4 1	840
	11th to 20th	Night	10% 33% 35% 18% 4	824
	21st to end	Night	12% 32% 35% 18% 3	692
March	1st to 10th	Night	9% 29% 33% 22% 5% 2	840
	11th to 20th	Night	10% 23% 30% 28% 8% 1	840
	21st to end	Night	9% 27% 37% 22% 5%	772
April	1st to 10th	Night	14% 23% 34% 24% 5%	630
	11th to 20th	Night	13% 26% 31% 25% 5% 1	623
	21st to end	Night	13% 19% 35% 24% 7% 1	630
May	1st to 10th	Night	14% 15% 32% 29% 10% 1	630
	11th to 20th	Night	13% 11% 27% 33% 14% 2	621
	21st to end	Night	12% 14% 29% 29% 14% 2	683
June	1st to 10th	Night	7% 9% 25% 37% 18% 4	630
	11th to 20th	Night	5% 13% 29% 35% 16% 2	630
	21st to end	Night	7% 9% 22% 35% 24% 3	630
July	1st to 10th	Night	7% 6% 19% 33% 32% 4	615
	11th to 20th	Night	5% 4 15% 36% 34% 6%	612
	21st to end	Night	8% 7% 10% 32% 37% 7%	690
August	1st to 10th	Night	9% 5% 16% 33% 31% 5%	627
	11th to 20th	Night	9% 5% 13% 40% 29% 4	624
	21st to end	Night	9% 5% 15% 36% 30% 5%	693
September	1st to 10th	Night	7% 7% 17% 38% 27% 5%	630
	11th to 20th	Night	8% 8% 24% 35% 20% 5%	630
	21st to end	Night	9% 9% 26% 32% 18% 5%	630
October	1st to 10th	Night	7% 13% 28% 35% 14% 3	814
	11th to 20th	Night	7% 20% 30% 26% 14% 4	812
	21st to end	Night	9% 20% 29% 27% 13% 3	905
November	1st to 10th	Night	7% 23% 33% 24% 11% 2	1025
	11th to 20th	Night	11% 22% 33% 24% 7% 2	1050
	21st to end	Night	9% 25% 32% 25% 8% 2	1050
December	1st to 10th	Night	11% 26% 31% 24% 6% 2	1050
	11th to 20th	Night	12% 29% 33% 17% 8% 1	1050
	21st to end	Night	13% 32% 30% 18% 5% 1	1155

Page generated at 2026-10-11 03:06:32. Version ac07

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