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 2025-06-10.

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% 48%	123449
	Night	2 5% 2 6% 4 4 4 4 6% 7% 56%	123667
Transparency	Day	31% 5% 9% 22% 23% 10%	123197
	Night	26% 4 9% 25% 25% 9%	123507
Seeing	Day	15% 21% 30% 21% 10% 3	16283
	Night	9% 20% 28% 27% 14% 3	26381

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	3 3 9% 3 3 4 4 6% 9% 57%	3638
	11th to 20th	Day	3 1 7% 7% 7% 5% 4 5% 7% 53%	3869
	21st to end	Day	6% 3 7% 3 5% 4 3 4 7% 57%	4510
February	1st to 10th	Day	1 7% 4 7% 4 3 3 3 7% 7% 54%	1800
	11th to 20th	Day	1 2 2 7% 5% 4 5% 3 6% 9% 56%	1949
	21st to end	Day	1 6% 4 7% 3 4 3 4 5% 7% 57%	1650
March	1st to 10th	Day	1 6% 4 8% 5% 4 3 3 5% 6% 56%	4500
	11th to 20th	Day	1 8% 5% 15% 7% 5% 5% 3 6% 6% 39%	4954
	21st to end	Day	1 7% 4 8% 5% 5% 5% 5% 7% 8% 46%	5810
April	1st to 10th	Day	3 8% 3 8% 6% 6% 5% 4 6% 8% 44%	2400
	11th to 20th	Day	4 12% 4 9% 6% 4 4 4 6% 6% 42%	2371
	21st to end	Day	5% 12% 4 8% 6% 5% 5% 5% 7% 8% 37%	2400
May	1st to 10th	Day	5% 12% 3 8% 5% 6% 5% 5% 6% 7% 38%	5642
	11th to 20th	Day	4 8% 3 7% 5% 5% 5% 5% 6% 8% 44%	6197
	21st to end	Day	4 6% 2 6% 5% 5% 6% 6% 8% 9% 45%	6925
June	1st to 10th	Day	5% 6% 2 6% 5% 5% 6% 6% 8% 9% 41%	2788
	11th to 20th	Day	4 5% 3 5% 4 5% 5% 6% 7% 7% 49%	2660
	21st to end	Day	4 5% 2 6% 5% 6% 7% 6% 8% 8% 42%	2660
July	1st to 10th	Day	5% 5% 2 6% 6% 5% 7% 5% 7% 8% 45%	4430
	11th to 20th	Day	6% 6% 3 8% 7% 7% 7% 5% 8% 9% 35%	4430
	21st to end	Day	7% 7% 3 7% 6% 6% 6% 5% 7% 8% 39%	4623
August	1st to 10th	Day	7% 7% 3 9% 7% 7% 7% 5% 8% 9% 30%	4043
	11th to 20th	Day	5% 5% 2 7% 5% 6% 7% 6% 8% 9% 40%	3726
	21st to end	Day	6% 7% 2 7% 6% 6% 6% 5% 8% 11% 37%	4180
September	1st to 10th	Day	7% 6% 2 7% 5% 4 5% 4 7% 7% 46%	2280
	11th to 20th	Day	6% 4 2 6% 5% 5% 4 4 5% 6% 54%	2257
	21st to end	Day	6% 5% 2 5% 3 4 3 3 3 6% 59%	2090
October	1st to 10th	Day	4 3 1 4 3 3 3 3 4 5% 68%	3201
	11th to 20th	Day	3 6% 2 7% 5% 4 4 3 5% 7% 54%	3150
	21st to end	Day	2 5% 2 4 3 3 3 3 4 5% 66%	3358
November	1st to 10th	Day	1 6% 2 4 2 3 4 3 5% 6% 63%	1763
	11th to 20th	Day	1 4 2 5% 4 3 3 3 5% 8% 64%	1800
	21st to end	Day	1 4 2 6% 4 4 4 4 4 8% 59%	1745
December	1st to 10th	Day	3 2 5% 3 2 3 2 3 7% 68%	2620
	11th to 20th	Day	4 2 5% 4 3 3 3 6% 6% 63%	3026
	21st to end	Day	4 2 7% 5% 5% 5% 5% 7% 8% 52%	4004
January	1st to 10th	Night	2 2 11% 5% 4 4 3 6% 8% 55%	6327
	11th to 20th	Night	2 1 5% 5% 5% 4 3 5% 6% 63%	6142
	21st to end	Night	4 2 6% 4 4 4 3 4 6% 63%	6468
February	1st to 10th	Night	5% 3 6% 4 3 4 3 5% 8% 59%	2598
	11th to 20th	Night	1 5% 2 9% 5% 4 4 4 5% 7% 55%	2338
	21st to end	Night	6% 3 6% 4 3 4 2 3 7% 63%	1980
March	1st to 10th	Night	6% 3 7% 4 4 4 3 5% 6% 57%	5374
	11th to 20th	Night	1 5% 4 8% 5% 4 4 3 6% 8% 52%	5027
	21st to end	Night	1 5% 3 6% 4 4 5% 3 5% 8% 55%	5150
April	1st to 10th	Night	2 7% 3 6% 4 4 3 4 5% 7% 56%	2000
	11th to 20th	Night	4 9% 3 8% 4 5% 3 3 5% 7% 49%	1977
	21st to end	Night	5% 10% 3 6% 4 4 4 5% 6% 8% 46%	2000
May	1st to 10th	Night	4 9% 3 7% 5% 5% 5% 4 6% 7% 46%	4321
	11th to 20th	Night	5% 8% 2 6% 4 4 4 4 5% 8% 49%	3715
	21st to end	Night	5% 6% 2 6% 4 4 4 4 5% 6% 53%	3972
June	1st to 10th	Night	4 5% 2 6% 5% 4 4 4 7% 9% 50%	1596
	11th to 20th	Night	3 4 1 4 4 3 5% 5% 6% 8% 58%	1520
	21st to end	Night	4 5% 2 7% 5% 5% 5% 5% 6% 8% 49%	1520
July	1st to 10th	Night	5% 6% 2 7% 5% 4 5% 4 6% 7% 47%	2540
	11th to 20th	Night	4 5% 2 5% 4 5% 6% 6% 8% 12% 43%	2540
	21st to end	Night	4 5% 2 6% 4 5% 6% 6% 8% 9% 46%	2936
August	1st to 10th	Night	9% 7% 3 9% 6% 6% 6% 6% 8% 9% 31%	2894
	11th to 20th	Night	4 4 2 7% 5% 6% 5% 5% 8% 10% 43%	3113
	21st to end	Night	4 4 2 6% 5% 6% 7% 6% 9% 11% 40%	3487
September	1st to 10th	Night	6% 5% 2 6% 5% 5% 5% 4 7% 8% 48%	1900
	11th to 20th	Night	6% 4 1 5% 4 3 4 3 6% 7% 58%	1921
	21st to end	Night	4 6% 2 5% 3 3 4 3 4 6% 60%	2090
October	1st to 10th	Night	4 3 2 3 2 3 2 2 3 5% 71%	3763
	11th to 20th	Night	3 4 2 6% 3 3 4 4 5% 6% 60%	3778
	21st to end	Night	3 4 2 3 2 3 3 3 4 5% 69%	4168
November	1st to 10th	Night	1 5% 2 4 3 3 4 3 5% 8% 64%	2535
	11th to 20th	Night	3 1 4 5% 3 4 3 4 6% 66%	2600
	21st to end	Night	1 6% 2 5% 4 3 4 3 5% 7% 60%	2652
December	1st to 10th	Night	1 2 1 5% 2 2 3 3 5% 7% 70%	4570
	11th to 20th	Night	3 1 5% 3 3 3 3 5% 9% 63%	5181
	21st to end	Night	5% 3 8% 4 4 4 4 6% 7% 54%	6974

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	25% 2 8% 28% 25% 11%	3639
	11th to 20th	Day	30% 3 7% 21% 27% 12%	3869
	21st to end	Day	27% 4 6% 26% 24% 13%	4510
February	1st to 10th	Day	28% 3 10% 26% 21% 12%	1800
	11th to 20th	Day	24% 4 6% 26% 30% 10%	1959
	21st to end	Day	28% 2 4 20% 29% 17%	1650
March	1st to 10th	Day	26% 3 5% 17% 30% 18%	4500
	11th to 20th	Day	41% 4 6% 25% 19% 5%	4954
	21st to end	Day	32% 5% 10% 33% 17% 3	5810
April	1st to 10th	Day	36% 4 8% 21% 22% 9%	2400
	11th to 20th	Day	41% 4 5% 23% 20% 8%	2374
	21st to end	Day	42% 5% 8% 24% 18% 4	2400
May	1st to 10th	Day	40% 6% 8% 21% 15% 9%	5642
	11th to 20th	Day	36% 4 9% 21% 21% 8%	6201
	21st to end	Day	31% 7% 10% 21% 24% 7%	6926
June	1st to 10th	Day	35% 5% 14% 21% 17% 7%	2788
	11th to 20th	Day	29% 5% 9% 19% 23% 15%	2660
	21st to end	Day	35% 6% 9% 22% 20% 9%	2660
July	1st to 10th	Day	30% 9% 11% 13% 21% 17%	4361
	11th to 20th	Day	37% 9% 12% 22% 13% 6%	4355
	21st to end	Day	36% 7% 14% 17% 13% 13%	4477
August	1st to 10th	Day	44% 10% 15% 17% 11% 3	4029
	11th to 20th	Day	34% 9% 13% 15% 18% 10%	3762
	21st to end	Day	36% 8% 14% 18% 20% 4	4179
September	1st to 10th	Day	33% 4 9% 21% 23% 10%	2280
	11th to 20th	Day	29% 3 8% 19% 28% 12%	2257
	21st to end	Day	26% 3 5% 26% 31% 9%	2090
October	1st to 10th	Day	18% 3 6% 21% 33% 18%	3201
	11th to 20th	Day	25% 7% 10% 27% 24% 7%	3150
	21st to end	Day	19% 4 4 25% 39% 9%	3358
November	1st to 10th	Day	21% 3 8% 20% 33% 15%	1763
	11th to 20th	Day	21% 2 5% 31% 30% 11%	1800
	21st to end	Day	24% 3 7% 22% 30% 14%	1745
December	1st to 10th	Day	18% 3 8% 30% 30% 10%	2620
	11th to 20th	Day	20% 3 9% 29% 31% 9%	3024
	21st to end	Day	28% 3 8% 24% 26% 12%	4004
January	1st to 10th	Night	27% 2 6% 27% 30% 8%	6327
	11th to 20th	Night	23% 2 6% 25% 26% 17%	6142
	21st to end	Night	22% 3 8% 23% 29% 14%	6468
February	1st to 10th	Night	24% 2 9% 29% 24% 11%	2598
	11th to 20th	Night	28% 4 8% 28% 24% 8%	2338
	21st to end	Night	23% 3 3 25% 31% 15%	1980
March	1st to 10th	Night	25% 4 5% 15% 36% 15%	5374
	11th to 20th	Night	30% 3 7% 23% 29% 8%	5027
	21st to end	Night	26% 5% 11% 38% 18% 2	5150
April	1st to 10th	Night	27% 3 10% 27% 25% 7%	2000
	11th to 20th	Night	35% 2 8% 26% 22% 6%	1977
	21st to end	Night	35% 4 11% 29% 17% 4	2000
May	1st to 10th	Night	34% 7% 10% 29% 13% 7%	4318
	11th to 20th	Night	31% 3 10% 31% 20% 5%	3716
	21st to end	Night	30% 5% 11% 22% 25% 6%	3972
June	1st to 10th	Night	30% 3 20% 23% 14% 10%	1596
	11th to 20th	Night	23% 5% 10% 24% 22% 16%	1520
	21st to end	Night	33% 5% 8% 22% 20% 11%	1520
July	1st to 10th	Night	32% 6% 10% 18% 22% 12%	2500
	11th to 20th	Night	28% 7% 17% 32% 12% 4	2492
	21st to end	Night	26% 9% 16% 25% 12% 12%	2844
August	1st to 10th	Night	44% 8% 18% 16% 10% 4	2885
	11th to 20th	Night	32% 10% 17% 19% 18% 5%	3143
	21st to end	Night	32% 9% 19% 21% 17% 2	3487
September	1st to 10th	Night	32% 4 10% 24% 22% 7%	1900
	11th to 20th	Night	24% 4 11% 21% 28% 13%	1921
	21st to end	Night	25% 3 7% 28% 30% 7%	2090
October	1st to 10th	Night	18% 3 8% 24% 37% 11%	3763
	11th to 20th	Night	22% 7% 11% 27% 24% 8%	3778
	21st to end	Night	17% 3 5% 28% 35% 12%	4168
November	1st to 10th	Night	20% 2 9% 24% 31% 13%	2535
	11th to 20th	Night	18% 3 6% 30% 31% 12%	2600
	21st to end	Night	23% 2 7% 24% 30% 13%	2652
December	1st to 10th	Night	15% 3 8% 34% 31% 9%	4570
	11th to 20th	Night	20% 3 7% 28% 35% 8%	5182
	21st to end	Night	28% 3 10% 20% 27% 11%	6974

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	21% 24% 29% 18% 7% 1	300
	11th to 20th	Day	19% 31% 33% 14% 3 1	300
	21st to end	Day	10% 34% 31% 17% 6% 1	330
February	1st to 10th	Day	22% 41% 27% 9% 1 1	300
	11th to 20th	Day	22% 39% 27% 9% 2 1	300
	21st to end	Day	28% 30% 30% 10% 1	249
March	1st to 10th	Day	21% 31% 29% 14% 5%	300
	11th to 20th	Day	22% 26% 35% 11% 5% 1	480
	21st to end	Day	25% 32% 31% 9% 2 1	550
April	1st to 10th	Day	22% 34% 31% 11% 2 1	500
	11th to 20th	Day	29% 32% 27% 9% 3	492
	21st to end	Day	24% 28% 33% 13% 2	500
May	1st to 10th	Day	21% 26% 32% 16% 4 1	588
	11th to 20th	Day	16% 17% 33% 23% 8% 2	725
	21st to end	Day	14% 20% 29% 24% 11% 2	789
June	1st to 10th	Day	10% 16% 31% 25% 15% 4	726
	11th to 20th	Day	10% 17% 34% 26% 11% 3	680
	21st to end	Day	8% 16% 31% 23% 15% 6%	680
July	1st to 10th	Day	10% 11% 21% 31% 22% 6%	671
	11th to 20th	Day	9% 6% 25% 32% 21% 8%	668
	21st to end	Day	10% 6% 20% 34% 24% 6%	635
August	1st to 10th	Day	13% 7% 28% 32% 16% 3	487
	11th to 20th	Day	9% 9% 33% 30% 15% 5%	477
	21st to end	Day	10% 13% 29% 31% 14% 3	539
September	1st to 10th	Day	10% 10% 35% 28% 13% 4	490
	11th to 20th	Day	10% 18% 35% 24% 10% 3	467
	21st to end	Day	12% 15% 26% 30% 14% 5%	300
October	1st to 10th	Day	10% 19% 27% 25% 13% 6%	300
	11th to 20th	Day	14% 25% 30% 20% 8% 3	300
	21st to end	Day	14% 28% 32% 19% 6% 1	330
November	1st to 10th	Day	15% 29% 28% 19% 7% 2	300
	11th to 20th	Day	17% 29% 32% 16% 6% 1	300
	21st to end	Day	12% 26% 36% 18% 6% 1	300
December	1st to 10th	Day	17% 29% 30% 18% 5% 1	300
	11th to 20th	Day	17% 37% 29% 12% 5% 1	300
	21st to end	Day	20% 34% 29% 12% 5%	330
January	1st to 10th	Night	11% 26% 29% 22% 8% 3	1000
	11th to 20th	Night	11% 31% 29% 19% 8% 2	919
	21st to end	Night	6% 27% 35% 24% 6% 1	880
February	1st to 10th	Night	7% 34% 38% 16% 4 1	800
	11th to 20th	Night	9% 33% 35% 18% 4	784
	21st to end	Night	11% 32% 35% 19% 3	660
March	1st to 10th	Night	9% 29% 32% 22% 5% 2	800
	11th to 20th	Night	8% 22% 31% 30% 9% 1	800
	21st to end	Night	10% 26% 36% 23% 5%	735
April	1st to 10th	Night	14% 23% 34% 24% 5%	600
	11th to 20th	Night	13% 24% 31% 26% 6% 1	593
	21st to end	Night	13% 18% 35% 25% 8% 1	600
May	1st to 10th	Night	14% 14% 32% 29% 10% 1	600
	11th to 20th	Night	13% 11% 26% 34% 14% 2	591
	21st to end	Night	12% 13% 28% 30% 15% 2	650
June	1st to 10th	Night	7% 8% 26% 37% 19% 4	599
	11th to 20th	Night	5% 13% 27% 36% 17% 2	570
	21st to end	Night	6% 7% 20% 37% 26% 3	570
July	1st to 10th	Night	8% 5% 15% 34% 35% 4	555
	11th to 20th	Night	5% 4 12% 36% 37% 6%	552
	21st to end	Night	7% 6% 8% 31% 39% 7%	624
August	1st to 10th	Night	10% 5% 12% 33% 34% 6%	567
	11th to 20th	Night	9% 5% 12% 39% 31% 5%	564
	21st to end	Night	8% 4 16% 34% 32% 6%	627
September	1st to 10th	Night	7% 6% 14% 37% 30% 6%	570
	11th to 20th	Night	8% 7% 21% 36% 22% 6%	570
	21st to end	Night	8% 9% 24% 32% 20% 5%	570
October	1st to 10th	Night	7% 13% 27% 35% 15% 3	736
	11th to 20th	Night	6% 18% 30% 28% 15% 4	760
	21st to end	Night	9% 19% 28% 27% 14% 3	860
November	1st to 10th	Night	6% 23% 32% 25% 12% 2	975
	11th to 20th	Night	11% 22% 33% 25% 7% 2	1000
	21st to end	Night	9% 24% 31% 26% 8% 2	1000
December	1st to 10th	Night	9% 25% 32% 25% 7% 2	1000
	11th to 20th	Night	10% 29% 34% 18% 8% 1	1000
	21st to end	Night	13% 30% 31% 19% 6% 1	1100

Page generated at 2025-06-07 08:28:20. Version ac07

Copyright © 2025 Attilla Danko.