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 2024-03-08.

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 6% 3 6% 6% 4 5% 5% 6% 8% 47%	78657
	Night	3 5% 2 5% 5% 3 4 5% 6% 8% 54%	80968
Transparency	Day	34% 4 9% 23% 22% 9%	78367
	Night	28% 3 10% 26% 24% 9%	80780
Seeing	Day	14% 21% 30% 22% 11% 3	14509
	Night	9% 19% 27% 28% 14% 3	24736

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 6% 4 2 4 6% 7% 10% 54%	2538
	11th to 20th	Day	1 3 2 7% 6% 5% 5% 5% 6% 7% 53%	2699
	21st to end	Day	1 8% 5% 8% 5% 3 4 4 4 7% 50%	3146
February	1st to 10th	Day	1 7% 4 7% 5% 3 3 4 6% 8% 54%	1710
	11th to 20th	Day	1 2 2 5% 5% 3 5% 5% 6% 9% 57%	1849
	21st to end	Day	1 7% 4 6% 4 3 3 4 5% 7% 56%	1570
March	1st to 10th	Day	2 7% 4 7% 5% 3 4 4 5% 9% 50%	1870
	11th to 20th	Day	3 8% 3 7% 7% 3 5% 4 6% 8% 45%	1962
	21st to end	Day	2 8% 4 7% 6% 3 5% 5% 7% 8% 44%	2308
April	1st to 10th	Day	3 7% 3 7% 7% 5% 6% 4 6% 8% 44%	2160
	11th to 20th	Day	5% 11% 4 8% 7% 3 4 5% 5% 6% 41%	2131
	21st to end	Day	5% 12% 5% 7% 7% 4 6% 5% 7% 7% 36%	2160
May	1st to 10th	Day	9% 10% 4 8% 5% 3 6% 6% 6% 7% 34%	2236
	11th to 20th	Day	8% 10% 4 8% 7% 4 6% 6% 7% 8% 32%	2429
	21st to end	Day	6% 6% 3 7% 6% 4 6% 7% 6% 8% 40%	2724
June	1st to 10th	Day	5% 5% 3 5% 6% 4 7% 7% 8% 9% 42%	2520
	11th to 20th	Day	4 4 3 4 5% 3 6% 6% 7% 8% 50%	2520
	21st to end	Day	5% 5% 2 5% 6% 5% 7% 7% 8% 8% 42%	2520
July	1st to 10th	Day	7% 4 3 6% 7% 4 7% 7% 7% 7% 40%	2520
	11th to 20th	Day	6% 5% 3 6% 6% 5% 8% 7% 7% 9% 39%	2520
	21st to end	Day	8% 8% 4 7% 9% 5% 8% 7% 8% 9% 28%	2644
August	1st to 10th	Day	9% 6% 3 8% 8% 5% 7% 7% 7% 9% 31%	2305
	11th to 20th	Day	6% 5% 3 6% 6% 4 6% 8% 7% 9% 41%	2123
	21st to end	Day	7% 5% 2 7% 7% 5% 6% 6% 6% 10% 41%	2376
September	1st to 10th	Day	7% 5% 2 7% 5% 3 5% 5% 7% 7% 47%	2160
	11th to 20th	Day	6% 4 2 6% 5% 4 4 4 5% 6% 54%	2139
	21st to end	Day	6% 4 3 4 4 3 3 4 3 6% 60%	1980
October	1st to 10th	Day	6% 4 2 6% 4 3 4 6% 6% 6% 53%	1818
	11th to 20th	Day	3 4 2 4 3 1 4 4 4 5% 66%	1800
	21st to end	Day	4 7% 3 4 4 2 4 3 5% 5% 60%	1939
November	1st to 10th	Day	1 5% 2 4 3 2 4 4 5% 7% 65%	1673
	11th to 20th	Day	1 4 2 4 4 2 4 4 5% 8% 63%	1710
	21st to end	Day	1 4 3 5% 5% 3 4 5% 4 8% 58%	1658
December	1st to 10th	Day	1 3 3 5% 5% 3 4 5% 4 10% 58%	1520
	11th to 20th	Day	1 6% 3 5% 5% 3 4 5% 7% 7% 56%	1926
	21st to end	Day	1 4 2 7% 6% 3 5% 6% 8% 8% 51%	2794
January	1st to 10th	Night	3 2 9% 6% 4 5% 5% 5% 8% 54%	4417
	11th to 20th	Night	2 1 3 6% 3 4 5% 6% 7% 62%	4302
	21st to end	Night	1 4 3 7% 5% 3 4 4 5% 7% 58%	4521
February	1st to 10th	Night	5% 3 6% 5% 2 4 3 5% 8% 59%	2469
	11th to 20th	Night	1 5% 2 7% 6% 3 4 5% 4 7% 56%	2218
	21st to end	Night	6% 3 5% 4 2 4 3 4 7% 63%	1884
March	1st to 10th	Night	1 5% 2 5% 4 3 4 5% 6% 7% 57%	2250
	11th to 20th	Night	2 5% 4 7% 6% 3 5% 4 5% 8% 52%	1994
	21st to end	Night	2 6% 3 5% 5% 3 5% 5% 5% 8% 53%	2048
April	1st to 10th	Night	3 7% 3 5% 5% 3 3 4 4 7% 57%	1800
	11th to 20th	Night	4 9% 3 7% 5% 3 4 4 5% 7% 49%	1777
	21st to end	Night	5% 9% 3 6% 4 3 5% 4 6% 8% 46%	1800
May	1st to 10th	Night	8% 9% 3 7% 5% 3 5% 4 5% 6% 44%	1721
	11th to 20th	Night	7% 9% 3 7% 7% 3 6% 6% 6% 7% 39%	1463
	21st to end	Night	7% 7% 3 6% 5% 3 4 6% 7% 8% 46%	1552
June	1st to 10th	Night	3 4 2 5% 5% 2 5% 5% 6% 10% 51%	1440
	11th to 20th	Night	3 3 2 3 4 2 5% 6% 6% 8% 57%	1440
	21st to end	Night	3 4 3 5% 5% 3 5% 6% 6% 9% 50%	1440
July	1st to 10th	Night	6% 5% 3 7% 8% 4 5% 6% 8% 9% 40%	1440
	11th to 20th	Night	5% 5% 4 6% 4 3 5% 6% 6% 10% 47%	1440
	21st to end	Night	6% 6% 3 7% 7% 5% 8% 8% 9% 10% 31%	1670
August	1st to 10th	Night	6% 5% 3 8% 7% 5% 6% 7% 7% 9% 37%	1632
	11th to 20th	Night	7% 5% 3 6% 5% 3 5% 5% 7% 9% 45%	1778
	21st to end	Night	6% 4 2 5% 6% 4 6% 6% 7% 9% 44%	1980
September	1st to 10th	Night	6% 5% 3 6% 6% 4 5% 5% 7% 8% 47%	1800
	11th to 20th	Night	6% 4 1 4 4 2 3 4 6% 7% 58%	1819
	21st to end	Night	4 5% 2 4 4 2 4 4 4 6% 60%	1980
October	1st to 10th	Night	5% 4 2 4 4 2 4 4 4 8% 59%	2137
	11th to 20th	Night	2 3 1 3 3 2 3 4 4 5% 70%	2160
	21st to end	Night	5% 5% 2 4 3 2 4 4 5% 5% 62%	2398
November	1st to 10th	Night	1 4 2 3 3 2 3 4 4 8% 65%	2405
	11th to 20th	Night	3 1 4 4 3 4 4 4 7% 65%	2470
	21st to end	Night	1 6% 2 4 4 2 4 4 5% 8% 61%	2519
December	1st to 10th	Night	1 2 2 5% 4 3 4 4 6% 9% 58%	2660
	11th to 20th	Night	1 4 2 5% 5% 3 5% 5% 6% 11% 53%	3271
	21st to end	Night	1 4 3 7% 5% 3 5% 5% 7% 7% 54%	4873

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	26% 2 10% 25% 29% 9%	2539
	11th to 20th	Day	29% 2 8% 28% 25% 8%	2699
	21st to end	Day	34% 2 6% 28% 23% 7%	3146
February	1st to 10th	Day	29% 3 10% 27% 21% 10%	1710
	11th to 20th	Day	24% 4 6% 26% 30% 10%	1859
	21st to end	Day	29% 2 4 21% 29% 15%	1570
March	1st to 10th	Day	31% 3 6% 26% 26% 9%	1870
	11th to 20th	Day	36% 3 8% 24% 23% 6%	1962
	21st to end	Day	37% 4 8% 24% 21% 6%	2308
April	1st to 10th	Day	36% 4 9% 21% 21% 10%	2160
	11th to 20th	Day	44% 3 5% 23% 18% 6%	2134
	21st to end	Day	44% 4 8% 23% 17% 4	2160
May	1st to 10th	Day	46% 5% 9% 21% 15% 3	2236
	11th to 20th	Day	47% 5% 14% 19% 12% 2	2433
	21st to end	Day	38% 6% 12% 21% 16% 7%	2724
June	1st to 10th	Day	34% 5% 14% 21% 17% 8%	2520
	11th to 20th	Day	29% 4 9% 19% 23% 15%	2520
	21st to end	Day	35% 5% 9% 22% 20% 9%	2520
July	1st to 10th	Day	39% 5% 11% 17% 20% 9%	2451
	11th to 20th	Day	37% 5% 13% 25% 14% 6%	2445
	21st to end	Day	48% 6% 18% 17% 10% 2	2497
August	1st to 10th	Day	46% 6% 14% 15% 13% 6%	2290
	11th to 20th	Day	36% 6% 11% 20% 19% 8%	2123
	21st to end	Day	37% 4 10% 23% 21% 5%	2376
September	1st to 10th	Day	33% 4 9% 21% 23% 10%	2160
	11th to 20th	Day	30% 3 8% 20% 28% 12%	2139
	21st to end	Day	26% 3 5% 27% 31% 9%	1980
October	1st to 10th	Day	29% 4 7% 23% 26% 10%	1818
	11th to 20th	Day	20% 3 5% 22% 37% 13%	1800
	21st to end	Day	27% 3 4 28% 26% 12%	1939
November	1st to 10th	Day	20% 3 8% 21% 33% 16%	1673
	11th to 20th	Day	21% 3 5% 32% 29% 10%	1710
	21st to end	Day	25% 3 6% 22% 30% 14%	1658
December	1st to 10th	Day	22% 4 13% 26% 25% 9%	1520
	11th to 20th	Day	27% 2 10% 25% 26% 10%	1924
	21st to end	Day	31% 2 6% 23% 24% 13%	2794
January	1st to 10th	Night	29% 1 6% 27% 30% 6%	4417
	11th to 20th	Night	23% 1 7% 32% 28% 9%	4302
	21st to end	Night	28% 2 9% 29% 26% 6%	4521
February	1st to 10th	Night	26% 2 9% 30% 24% 10%	2469
	11th to 20th	Night	28% 3 7% 28% 25% 8%	2218
	21st to end	Night	23% 3 3 26% 31% 14%	1884
March	1st to 10th	Night	25% 3 7% 25% 32% 7%	2250
	11th to 20th	Night	31% 3 9% 28% 24% 5%	1994
	21st to end	Night	29% 4 8% 26% 28% 4	2048
April	1st to 10th	Night	28% 3 10% 26% 25% 8%	1800
	11th to 20th	Night	36% 2 9% 27% 21% 6%	1777
	21st to end	Night	36% 3 12% 28% 17% 4	1800
May	1st to 10th	Night	39% 4 10% 27% 16% 4	1721
	11th to 20th	Night	43% 4 15% 21% 14% 2	1464
	21st to end	Night	35% 4 14% 22% 17% 8%	1552
June	1st to 10th	Night	28% 3 20% 23% 14% 11%	1440
	11th to 20th	Night	23% 5% 10% 24% 22% 16%	1440
	21st to end	Night	33% 5% 8% 23% 20% 11%	1440
July	1st to 10th	Night	39% 5% 13% 20% 16% 7%	1400
	11th to 20th	Night	32% 4 14% 30% 14% 5%	1392
	21st to end	Night	40% 9% 20% 22% 8% 1	1577
August	1st to 10th	Night	40% 7% 18% 18% 11% 6%	1623
	11th to 20th	Night	34% 5% 13% 25% 17% 5%	1778
	21st to end	Night	34% 5% 12% 26% 18% 4	1980
September	1st to 10th	Night	34% 4 10% 24% 22% 7%	1800
	11th to 20th	Night	24% 4 11% 21% 27% 13%	1819
	21st to end	Night	26% 3 7% 29% 29% 7%	1980
October	1st to 10th	Night	26% 3 10% 24% 26% 10%	2137
	11th to 20th	Night	17% 3 6% 23% 36% 14%	2160
	21st to end	Night	24% 3 5% 29% 28% 11%	2398
November	1st to 10th	Night	19% 2 9% 25% 32% 14%	2405
	11th to 20th	Night	19% 3 7% 31% 30% 11%	2470
	21st to end	Night	24% 2 7% 24% 29% 14%	2519
December	1st to 10th	Night	22% 4 13% 26% 25% 9%	2660
	11th to 20th	Night	27% 3 9% 23% 29% 8%	3272
	21st to end	Night	29% 2 9% 23% 22% 14%	4873

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	20% 22% 29% 20% 8% 1	270
	11th to 20th	Day	20% 31% 31% 14% 3 1	270
	21st to end	Day	8% 34% 32% 19% 7% 1	297
February	1st to 10th	Day	16% 42% 30% 10% 1 1	270
	11th to 20th	Day	18% 40% 29% 10% 2 1	270
	21st to end	Day	28% 30% 31% 9% 1	225
March	1st to 10th	Day	19% 34% 30% 12% 6%	261
	11th to 20th	Day	21% 27% 36% 11% 5%	402
	21st to end	Day	24% 31% 33% 8% 2 1	462
April	1st to 10th	Day	22% 33% 31% 11% 2	420
	11th to 20th	Day	29% 31% 27% 9% 3	412
	21st to end	Day	25% 29% 31% 13% 3	420
May	1st to 10th	Day	19% 23% 35% 17% 4 1	499
	11th to 20th	Day	15% 16% 32% 24% 9% 3	625
	21st to end	Day	15% 19% 28% 25% 12% 2	679
June	1st to 10th	Day	10% 15% 30% 25% 17% 4	630
	11th to 20th	Day	9% 15% 34% 27% 11% 3	630
	21st to end	Day	7% 15% 31% 24% 16% 6%	630
July	1st to 10th	Day	9% 8% 20% 33% 23% 6%	621
	11th to 20th	Day	9% 5% 24% 32% 22% 9%	618
	21st to end	Day	10% 5% 19% 35% 25% 6%	586
August	1st to 10th	Day	14% 6% 28% 32% 17% 3	447
	11th to 20th	Day	10% 8% 31% 30% 16% 5%	437
	21st to end	Day	10% 11% 29% 32% 15% 3	495
September	1st to 10th	Day	10% 10% 35% 28% 12% 4	450
	11th to 20th	Day	9% 17% 36% 24% 10% 3	429
	21st to end	Day	11% 14% 26% 29% 15% 5%	270
October	1st to 10th	Day	11% 19% 25% 25% 14% 6%	270
	11th to 20th	Day	13% 25% 29% 21% 9% 3	270
	21st to end	Day	13% 28% 31% 20% 7% 1	297
November	1st to 10th	Day	13% 29% 29% 20% 7% 2	270
	11th to 20th	Day	13% 29% 34% 17% 6% 1	270
	21st to end	Day	11% 25% 36% 19% 7% 1	270
December	1st to 10th	Day	18% 29% 31% 16% 6% 1	270
	11th to 20th	Day	14% 37% 30% 13% 5% 1	270
	21st to end	Day	18% 35% 29% 12% 6%	297
January	1st to 10th	Night	11% 26% 29% 23% 9% 3	950
	11th to 20th	Night	11% 30% 29% 19% 8% 2	874
	21st to end	Night	5% 27% 35% 25% 7% 1	836
February	1st to 10th	Night	6% 33% 39% 17% 4 1	760
	11th to 20th	Night	8% 32% 36% 19% 5%	744
	21st to end	Night	11% 30% 36% 19% 3	628
March	1st to 10th	Night	8% 30% 32% 23% 5% 2	750
	11th to 20th	Night	7% 20% 32% 31% 9% 1	720
	21st to end	Night	9% 26% 36% 24% 5%	662
April	1st to 10th	Night	14% 22% 34% 26% 5%	540
	11th to 20th	Night	14% 23% 29% 26% 6% 1	533
	21st to end	Night	14% 18% 33% 26% 8% 1	540
May	1st to 10th	Night	13% 14% 31% 31% 11% 1	540
	11th to 20th	Night	13% 11% 24% 35% 16% 2	531
	21st to end	Night	12% 13% 27% 30% 16% 2	584
June	1st to 10th	Night	6% 7% 24% 38% 21% 4	540
	11th to 20th	Night	4 12% 26% 37% 18% 2	540
	21st to end	Night	6% 6% 19% 37% 28% 4	540
July	1st to 10th	Night	8% 5% 13% 34% 36% 4	525
	11th to 20th	Night	5% 4 11% 34% 39% 7%	522
	21st to end	Night	8% 6% 6% 31% 41% 8%	591
August	1st to 10th	Night	9% 5% 11% 33% 36% 6%	537
	11th to 20th	Night	9% 4 11% 38% 32% 5%	534
	21st to end	Night	8% 4 14% 34% 34% 6%	594
September	1st to 10th	Night	7% 6% 14% 36% 31% 6%	540
	11th to 20th	Night	9% 6% 19% 37% 24% 6%	540
	21st to end	Night	9% 9% 23% 33% 21% 6%	540
October	1st to 10th	Night	7% 13% 27% 34% 16% 3	697
	11th to 20th	Night	6% 17% 30% 28% 15% 4	720
	21st to end	Night	9% 18% 27% 28% 15% 3	814
November	1st to 10th	Night	5% 21% 32% 26% 13% 2	925
	11th to 20th	Night	10% 21% 33% 26% 8% 3	950
	21st to end	Night	8% 23% 31% 27% 8% 2	950
December	1st to 10th	Night	9% 27% 32% 24% 7% 2	950
	11th to 20th	Night	9% 29% 34% 19% 9% 1	950
	21st to end	Night	13% 30% 31% 20% 6% 1	1045

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