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 2024-11-02.

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 7% 5% 5% 5% 4 6% 8% 46%	101247
	Night	3 5% 2 6% 4 4 4 4 6% 8% 53%	97958
Transparency	Day	33% 4 9% 22% 22% 9%	100994
	Night	29% 4 10% 26% 24% 8%	97801
Seeing	Day	14% 21% 30% 22% 10% 3	15498
	Night	9% 19% 28% 28% 14% 3	25506

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 7% 3 3 5% 4 7% 10% 54%	2538
	11th to 20th	Day	1 3 1 8% 5% 6% 5% 4 6% 7% 53%	2699
	21st to end	Day	1 9% 4 9% 4 4 4 3 4 7% 50%	3146
February	1st to 10th	Day	1 7% 4 8% 4 3 3 3 7% 7% 53%	1710
	11th to 20th	Day	1 3 2 6% 5% 4 5% 3 6% 9% 56%	1849
	21st to end	Day	1 7% 4 7% 3 4 3 4 5% 7% 55%	1570
March	1st to 10th	Day	1 8% 5% 8% 4 4 3 2 5% 6% 54%	3130
	11th to 20th	Day	2 11% 5% 12% 7% 5% 5% 4 6% 6% 37%	3458
	21st to end	Day	1 7% 4 8% 5% 5% 5% 5% 7% 8% 45%	4058
April	1st to 10th	Day	3 8% 3 8% 6% 6% 5% 4 6% 8% 45%	2280
	11th to 20th	Day	4 12% 4 9% 6% 4 4 4 5% 6% 42%	2251
	21st to end	Day	5% 13% 4 8% 6% 5% 5% 5% 6% 7% 36%	2280
May	1st to 10th	Day	6% 12% 3 8% 5% 5% 5% 5% 6% 7% 39%	3946
	11th to 20th	Day	6% 9% 3 9% 6% 6% 6% 5% 7% 8% 37%	4313
	21st to end	Day	4 6% 2 6% 4 5% 5% 6% 7% 9% 46%	4825
June	1st to 10th	Day	5% 6% 2 6% 5% 5% 6% 6% 9% 9% 42%	2660
	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	5% 4 2 6% 4 4 4 5% 5% 6% 54%	1919
	11th to 20th	Day	3 5% 2 5% 3 2 4 3 4 5% 64%	1900
	21st to end	Day	4 7% 2 4 3 3 3 3 5% 5% 61%	2046
November	1st to 10th	Day	1 5% 2 4 2 3 3 3 5% 6% 65%	1682
	11th to 20th	Day	1 4 2 5% 4 3 4 3 5% 8% 62%	1710
	21st to end	Day	1 5% 2 6% 5% 4 5% 4 4 8% 58%	1658
December	1st to 10th	Day	1 4 3 6% 4 3 4 3 5% 10% 58%	1520
	11th to 20th	Day	1 6% 3 5% 5% 4 4 4 7% 6% 56%	1926
	21st to end	Day	1 4 2 8% 5% 5% 5% 4 8% 8% 51%	2794
January	1st to 10th	Night	3 2 10% 5% 5% 4 4 5% 8% 54%	4417
	11th to 20th	Night	3 1 4 5% 4 4 4 6% 6% 62%	4302
	21st to end	Night	1 5% 3 8% 4 4 4 3 5% 7% 57%	4521
February	1st to 10th	Night	5% 3 7% 4 3 4 3 5% 8% 59%	2469
	11th to 20th	Night	1 6% 2 8% 4 4 4 4 5% 6% 56%	2218
	21st to end	Night	6% 3 6% 4 3 4 2 3 7% 63%	1884
March	1st to 10th	Night	1 8% 4 6% 3 4 3 3 5% 6% 57%	3734
	11th to 20th	Night	1 8% 5% 9% 5% 4 4 4 5% 8% 47%	3504
	21st to end	Night	1 5% 3 6% 4 4 5% 4 6% 8% 54%	3587
April	1st to 10th	Night	2 8% 3 5% 4 4 3 4 5% 7% 56%	1900
	11th to 20th	Night	4 9% 3 8% 5% 5% 3 3 5% 7% 48%	1877
	21st to end	Night	5% 10% 3 6% 4 4 4 4 6% 8% 46%	1900
May	1st to 10th	Night	5% 10% 3 7% 4 4 4 3 5% 6% 49%	3021
	11th to 20th	Night	6% 8% 3 7% 5% 4 5% 5% 6% 8% 44%	2589
	21st to end	Night	4 5% 2 6% 4 4 4 4 5% 7% 55%	2762
June	1st to 10th	Night	3 4 2 6% 5% 4 4 4 7% 10% 51%	1520
	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	5% 4 2 4 3 3 4 3 4 7% 61%	2256
	11th to 20th	Night	2 3 1 4 2 2 3 3 4 5% 69%	2280
	21st to end	Night	4 5% 2 4 3 3 4 3 5% 5% 62%	2532
November	1st to 10th	Night	1 5% 1 3 3 2 3 3 5% 8% 65%	2431
	11th to 20th	Night	3 1 4 5% 3 4 3 4 7% 65%	2470
	21st to end	Night	1 6% 2 5% 4 3 4 3 5% 8% 60%	2519
December	1st to 10th	Night	1 3 2 6% 4 4 4 4 6% 10% 58%	2660
	11th to 20th	Night	1 5% 2 6% 4 4 5% 4 7% 10% 53%	3271
	21st to end	Night	5% 3 7% 4 4 4 4 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% 2 4 21% 32% 11%	3130
	11th to 20th	Day	46% 2 6% 29% 14% 3	3458
	21st to end	Day	37% 2 7% 28% 22% 4	4058
April	1st to 10th	Day	36% 3 8% 20% 23% 10%	2280
	11th to 20th	Day	42% 3 5% 23% 19% 8%	2254
	21st to end	Day	44% 4 7% 23% 18% 4	2280
May	1st to 10th	Day	42% 3 8% 19% 15% 13%	3946
	11th to 20th	Day	44% 3 9% 23% 17% 4	4317
	21st to end	Day	33% 3 9% 20% 25% 9%	4825
June	1st to 10th	Day	34% 5% 14% 22% 17% 8%	2660
	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	28% 4 7% 23% 27% 11%	1919
	11th to 20th	Day	21% 4 6% 22% 36% 12%	1900
	21st to end	Day	26% 3 4 27% 28% 12%	2046
November	1st to 10th	Day	20% 3 8% 21% 33% 15%	1682
	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	30% 2 4 20% 36% 9%	3734
	11th to 20th	Night	36% 2 8% 31% 21% 3	3504
	21st to end	Night	29% 3 10% 35% 22% 3	3587
April	1st to 10th	Night	28% 3 10% 26% 26% 7%	1900
	11th to 20th	Night	36% 2 8% 26% 22% 6%	1877
	21st to end	Night	36% 3 12% 28% 17% 4	1900
May	1st to 10th	Night	37% 2 8% 25% 17% 10%	3021
	11th to 20th	Night	38% 2 10% 31% 15% 4	2590
	21st to end	Night	31% 2 10% 23% 26% 8%	2762
June	1st to 10th	Night	28% 3 20% 23% 15% 10%	1520
	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	25% 3 10% 24% 27% 11%	2256
	11th to 20th	Night	18% 4 7% 23% 35% 14%	2280
	21st to end	Night	23% 3 5% 29% 28% 12%	2532
November	1st to 10th	Night	19% 2 9% 25% 31% 14%	2431
	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% 32% 30% 14% 6%	270
	11th to 20th	Day	20% 26% 36% 12% 5% 1	441
	21st to end	Day	24% 31% 32% 9% 3 1	506
April	1st to 10th	Day	22% 32% 32% 11% 2 1	460
	11th to 20th	Day	28% 31% 29% 9% 3	452
	21st to end	Day	24% 27% 32% 14% 2	460
May	1st to 10th	Day	21% 25% 33% 16% 4 1	544
	11th to 20th	Day	14% 16% 34% 24% 9% 3	675
	21st to end	Day	14% 19% 28% 25% 11% 2	734
June	1st to 10th	Day	9% 14% 31% 26% 16% 4	680
	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	12% 30% 29% 20% 7% 2	273
	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% 29% 31% 23% 6% 2	760
	11th to 20th	Night	7% 20% 32% 31% 9% 1	760
	21st to end	Night	9% 26% 36% 24% 5%	698
April	1st to 10th	Night	14% 22% 33% 25% 5%	570
	11th to 20th	Night	13% 23% 30% 26% 6% 1	563
	21st to end	Night	13% 18% 34% 25% 8% 1	570
May	1st to 10th	Night	14% 14% 31% 30% 10% 1	570
	11th to 20th	Night	13% 10% 25% 35% 15% 2	561
	21st to end	Night	12% 13% 27% 30% 16% 2	617
June	1st to 10th	Night	6% 8% 25% 38% 20% 4	570
	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% 27% 27% 14% 3	860
November	1st to 10th	Night	5% 21% 33% 26% 12% 2	935
	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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