Wolf Creek State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Wolf Creek State Park clear sky chart from 2005-11-06 to 2026-04-02.

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	12% 8% 3 7% 5% 4 5% 4 6% 8% 38%	131277
	Night	14% 9% 3 7% 4 4 4 3 5% 7% 40%	130762
Transparency	Day	42% 6% 12% 24% 15% 2	134836
	Night	43% 5% 11% 23% 16% 2	135278
Seeing	Day	16% 8% 26% 26% 17% 6%	17488
	Night	18% 8% 28% 31% 14% 1	27448

By Month

Percentage Cloud Cover SE (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	11% 11% 6% 13% 6% 5% 5% 4 5% 7% 29%	4691
	11th to 20th	Day	8% 10% 5% 13% 8% 8% 7% 5% 5% 5% 26%	4710
	21st to end	Day	16% 16% 5% 11% 6% 4 4 3 4 5% 26%	5710
February	1st to 10th	Day	15% 11% 5% 10% 6% 4 4 4 5% 7% 28%	1974
	11th to 20th	Day	15% 10% 4 8% 7% 5% 4 3 5% 8% 31%	2048
	21st to end	Day	16% 12% 4 8% 5% 4 4 3 5% 6% 34%	1730
March	1st to 10th	Day	17% 15% 3 7% 3 3 2 2 3 4 40%	4580
	11th to 20th	Day	9% 10% 3 6% 3 3 4 3 6% 8% 45%	4824
	21st to end	Day	16% 11% 3 8% 6% 5% 5% 3 5% 7% 31%	6095
April	1st to 10th	Day	15% 8% 3 7% 4 5% 5% 4 6% 7% 36%	2412
	11th to 20th	Day	16% 9% 3 7% 4 4 4 3 4 6% 40%	2374
	21st to end	Day	18% 8% 2 7% 4 4 4 3 5% 6% 37%	2408
May	1st to 10th	Day	17% 8% 2 7% 5% 5% 5% 4 6% 10% 29%	5862
	11th to 20th	Day	15% 8% 2 7% 4 4 4 4 5% 8% 38%	5996
	21st to end	Day	11% 7% 2 7% 5% 5% 6% 4 7% 9% 37%	6935
June	1st to 10th	Day	9% 5% 2 5% 5% 5% 5% 4 7% 9% 45%	2800
	11th to 20th	Day	8% 5% 2 6% 5% 4 5% 4 7% 9% 46%	2800
	21st to end	Day	7% 5% 2 6% 5% 4 5% 5% 8% 10% 42%	2800
July	1st to 10th	Day	10% 5% 2 6% 4 4 5% 4 7% 10% 44%	6360
	11th to 20th	Day	7% 7% 3 8% 5% 5% 6% 6% 7% 11% 36%	6360
	21st to end	Day	9% 6% 2 7% 5% 5% 6% 5% 8% 11% 36%	6924
August	1st to 10th	Day	9% 4 1 4 3 3 4 3 6% 10% 53%	4140
	11th to 20th	Day	8% 5% 2 6% 5% 5% 6% 5% 7% 10% 41%	3849
	21st to end	Day	5% 4 2 5% 5% 4 5% 4 7% 10% 50%	4312
September	1st to 10th	Day	11% 5% 2 7% 5% 4 4 3 5% 7% 48%	2400
	11th to 20th	Day	8% 4 2 6% 4 4 5% 4 5% 7% 50%	2290
	21st to end	Day	10% 5% 2 5% 4 4 4 3 5% 8% 51%	2200
October	1st to 10th	Day	10% 4 2 5% 4 3 3 4 5% 8% 52%	2134
	11th to 20th	Day	15% 7% 1 5% 4 3 4 3 5% 6% 47%	2000
	21st to end	Day	18% 8% 3 7% 4 3 3 3 5% 6% 42%	2046
November	1st to 10th	Day	10% 7% 3 5% 3 3 3 2 5% 7% 52%	1852
	11th to 20th	Day	16% 9% 2 7% 4 3 3 3 5% 7% 41%	1890
	21st to end	Day	16% 11% 4 8% 5% 3 4 3 4 5% 37%	1890
December	1st to 10th	Day	9% 10% 4 6% 5% 4 3 3 5% 7% 44%	2723
	11th to 20th	Day	13% 13% 6% 11% 5% 5% 5% 4 5% 7% 28%	3088
	21st to end	Day	27% 17% 5% 12% 4 4 3 3 4 5% 17%	4070
January	1st to 10th	Night	14% 12% 5% 11% 4 4 4 3 4 6% 33%	8232
	11th to 20th	Night	10% 13% 5% 11% 5% 5% 7% 4 4 5% 30%	8280
	21st to end	Night	17% 11% 5% 8% 5% 4 5% 3 4 7% 30%	8489
February	1st to 10th	Night	17% 12% 5% 9% 5% 4 4 3 4 6% 31%	2643
	11th to 20th	Night	16% 8% 4 8% 5% 4 4 3 5% 6% 37%	2458
	21st to end	Night	18% 10% 3 8% 4 3 4 3 4 6% 39%	2076
March	1st to 10th	Night	18% 15% 3 7% 3 3 3 2 4 4 37%	5493
	11th to 20th	Night	12% 7% 2 5% 4 4 4 3 4 7% 49%	5387
	21st to end	Night	17% 9% 3 8% 5% 4 5% 4 5% 6% 33%	5074
April	1st to 10th	Night	13% 7% 3 7% 4 4 4 3 4 6% 43%	2010
	11th to 20th	Night	16% 9% 2 6% 4 3 3 3 4 6% 45%	1975
	21st to end	Night	18% 7% 2 8% 5% 5% 4 3 5% 6% 37%	1990
May	1st to 10th	Night	17% 10% 3 9% 4 4 4 4 5% 7% 34%	4033
	11th to 20th	Night	15% 7% 2 6% 4 4 5% 3 6% 9% 38%	3889
	21st to end	Night	13% 7% 3 7% 5% 4 4 4 6% 9% 39%	3942
June	1st to 10th	Night	8% 5% 2 6% 4 3 4 4 6% 9% 48%	1600
	11th to 20th	Night	7% 4 2 6% 4 4 4 4 6% 8% 52%	1600
	21st to end	Night	6% 6% 2 6% 5% 4 4 4 7% 11% 46%	1600
July	1st to 10th	Night	10% 5% 2 6% 4 4 4 4 5% 10% 47%	3618
	11th to 20th	Night	5% 6% 2 6% 4 5% 5% 4 8% 9% 46%	3617
	21st to end	Night	7% 7% 2 7% 4 5% 5% 4 8% 11% 39%	3947
August	1st to 10th	Night	6% 4 2 5% 4 3 4 4 6% 9% 54%	2982
	11th to 20th	Night	6% 5% 2 5% 3 5% 5% 5% 7% 8% 48%	3200
	21st to end	Night	5% 3 1 3 4 4 4 4 7% 9% 58%	3586
September	1st to 10th	Night	10% 5% 2 4 4 2 4 2 5% 7% 54%	2000
	11th to 20th	Night	6% 5% 1 5% 4 3 4 3 6% 9% 54%	2090
	21st to end	Night	10% 6% 2 5% 3 3 4 4 4 7% 52%	2200
October	1st to 10th	Night	10% 3 1 5% 4 3 3 3 5% 6% 57%	2263
	11th to 20th	Night	14% 6% 2 4 3 3 4 2 4 6% 53%	2400
	21st to end	Night	17% 9% 3 5% 3 3 4 3 5% 5% 42%	2792
November	1st to 10th	Night	10% 6% 2 5% 3 4 4 3 5% 5% 52%	2666
	11th to 20th	Night	13% 7% 3 6% 4 3 4 3 5% 6% 45%	2730
	21st to end	Night	18% 10% 4 7% 4 3 3 3 4 6% 39%	2730
December	1st to 10th	Night	13% 8% 3 8% 4 3 4 3 4 6% 44%	4681
	11th to 20th	Night	16% 9% 4 9% 5% 4 4 4 5% 6% 35%	5339
	21st to end	Night	28% 16% 5% 9% 5% 4 3 3 4 4 19%	7150

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	54% 5% 11% 21% 8% 1	4692
	11th to 20th	Day	55% 7% 10% 15% 11% 2	4710
	21st to end	Day	62% 3 7% 19% 7% 2	5710
February	1st to 10th	Day	53% 6% 13% 19% 9% 1	1974
	11th to 20th	Day	52% 5% 10% 20% 11% 1	2058
	21st to end	Day	51% 5% 8% 24% 10% 3	1730
March	1st to 10th	Day	50% 3 5% 21% 18% 3	4580
	11th to 20th	Day	36% 5% 11% 30% 17% 1	4824
	21st to end	Day	50% 7% 11% 24% 7% 1	6097
April	1st to 10th	Day	44% 6% 13% 23% 14% 1	2412
	11th to 20th	Day	45% 5% 10% 25% 12% 3	2374
	21st to end	Day	47% 5% 13% 22% 10% 3	2408
May	1st to 10th	Day	48% 8% 13% 20% 11% 1	5897
	11th to 20th	Day	44% 6% 11% 25% 13% 1	6000
	21st to end	Day	40% 7% 12% 23% 16% 2	6949
June	1st to 10th	Day	33% 9% 14% 26% 16% 3	2800
	11th to 20th	Day	33% 7% 12% 25% 21% 3	2800
	21st to end	Day	33% 8% 16% 23% 17% 3	2800
July	1st to 10th	Day	34% 6% 11% 31% 17% 2	6291
	11th to 20th	Day	40% 8% 14% 24% 13% 1	6285
	21st to end	Day	38% 8% 18% 25% 9% 1	6728
August	1st to 10th	Day	26% 6% 15% 37% 14% 1	4125
	11th to 20th	Day	35% 7% 15% 27% 15% 1	3885
	21st to end	Day	27% 7% 16% 32% 15% 4	4311
September	1st to 10th	Day	35% 6% 11% 24% 20% 4	2400
	11th to 20th	Day	32% 5% 10% 24% 25% 3	2290
	21st to end	Day	32% 5% 10% 26% 25% 3	2200
October	1st to 10th	Day	21% 3 8% 23% 40% 4	3472
	11th to 20th	Day	27% 3 8% 23% 35% 3	3240
	21st to end	Day	37% 3 8% 24% 26% 2	3284
November	1st to 10th	Day	33% 4 12% 28% 19% 4	1852
	11th to 20th	Day	43% 4 9% 23% 16% 4	1890
	21st to end	Day	50% 4 10% 22% 13% 1	1890
December	1st to 10th	Day	40% 5% 14% 28% 12%	2723
	11th to 20th	Day	55% 5% 9% 23% 7% 1	3085
	21st to end	Day	71% 4 10% 11% 4	4070
January	1st to 10th	Night	53% 5% 12% 23% 7%	8233
	11th to 20th	Night	56% 3 8% 16% 14% 3	8280
	21st to end	Night	55% 3 9% 21% 10% 1	8489
February	1st to 10th	Night	54% 4 11% 19% 10% 1	2643
	11th to 20th	Night	48% 4 9% 22% 15% 2	2459
	21st to end	Night	48% 4 10% 24% 12% 3	2076
March	1st to 10th	Night	51% 4 7% 20% 15% 3	5493
	11th to 20th	Night	36% 5% 9% 28% 20% 3	5387
	21st to end	Night	50% 6% 10% 24% 9% 1	5074
April	1st to 10th	Night	42% 5% 11% 24% 16% 2	2010
	11th to 20th	Night	40% 4 10% 24% 18% 3	1975
	21st to end	Night	47% 6% 11% 21% 13% 3	1990
May	1st to 10th	Night	48% 7% 13% 21% 9% 2	4060
	11th to 20th	Night	41% 8% 11% 25% 14% 1	3890
	21st to end	Night	41% 6% 14% 22% 15% 2	3950
June	1st to 10th	Night	31% 7% 12% 26% 19% 4	1600
	11th to 20th	Night	30% 6% 11% 26% 23% 5%	1600
	21st to end	Night	30% 8% 15% 25% 18% 6%	1600
July	1st to 10th	Night	34% 5% 11% 26% 22% 3	3580
	11th to 20th	Night	31% 8% 15% 29% 16% 2	3572
	21st to end	Night	37% 8% 17% 23% 14% 1	3832
August	1st to 10th	Night	24% 7% 15% 36% 16% 1	2973
	11th to 20th	Night	31% 7% 14% 29% 18% 1	3230
	21st to end	Night	22% 7% 15% 33% 19% 4	3586
September	1st to 10th	Night	30% 5% 9% 28% 22% 7%	2000
	11th to 20th	Night	27% 5% 10% 27% 27% 4	2090
	21st to end	Night	32% 5% 9% 23% 26% 5%	2200
October	1st to 10th	Night	19% 4 7% 23% 44% 4	3705
	11th to 20th	Night	24% 2 8% 25% 36% 4	3899
	21st to end	Night	34% 4 8% 24% 24% 5%	4504
November	1st to 10th	Night	34% 4 10% 25% 22% 6%	2666
	11th to 20th	Night	39% 4 9% 26% 20% 2	2730
	21st to end	Night	48% 4 10% 23% 15% 1	2730
December	1st to 10th	Night	42% 3 11% 27% 15% 1	4681
	11th to 20th	Night	49% 5% 12% 22% 11%	5341
	21st to end	Night	68% 5% 10% 12% 5% 1	7150

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% 16% 33% 22% 7% 1	330
	11th to 20th	Day	25% 16% 36% 19% 3	330
	21st to end	Day	19% 16% 43% 17% 4	363
February	1st to 10th	Day	25% 14% 38% 19% 4	330
	11th to 20th	Day	26% 18% 36% 15% 3 1	330
	21st to end	Day	27% 11% 42% 17% 2	273
March	1st to 10th	Day	23% 18% 37% 18% 4	330
	11th to 20th	Day	27% 16% 37% 16% 4	330
	21st to end	Day	28% 12% 37% 16% 6% 1	590
April	1st to 10th	Day	20% 13% 35% 23% 8% 2	504
	11th to 20th	Day	23% 15% 29% 20% 12% 2	492
	21st to end	Day	24% 9% 37% 20% 8% 2	500
May	1st to 10th	Day	19% 10% 31% 28% 10% 3	503
	11th to 20th	Day	18% 8% 25% 28% 16% 4	584
	21st to end	Day	12% 4 31% 30% 16% 8%	789
June	1st to 10th	Day	11% 5% 22% 31% 25% 7%	730
	11th to 20th	Day	11% 3 22% 34% 22% 7%	730
	21st to end	Day	8% 4 26% 32% 23% 7%	730
July	1st to 10th	Day	12% 2 12% 30% 26% 18%	721
	11th to 20th	Day	8% 2 15% 34% 28% 12%	718
	21st to end	Day	10% 1 14% 32% 33% 10%	794
August	1st to 10th	Day	10% 2 13% 32% 31% 12%	625
	11th to 20th	Day	10% 3 16% 28% 29% 15%	519
	21st to end	Day	7% 2 11% 32% 36% 12%	583
September	1st to 10th	Day	11% 3 16% 31% 30% 10%	530
	11th to 20th	Day	8% 1 10% 31% 33% 15%	530
	21st to end	Day	13% 5% 24% 23% 23% 12%	530
October	1st to 10th	Day	11% 4 24% 33% 22% 7%	464
	11th to 20th	Day	17% 13% 31% 26% 11% 3	330
	21st to end	Day	27% 12% 33% 23% 4	363
November	1st to 10th	Day	16% 11% 32% 25% 12% 4	330
	11th to 20th	Day	21% 14% 34% 22% 7% 2	330
	21st to end	Day	24% 12% 32% 22% 9%	330
December	1st to 10th	Day	17% 13% 42% 20% 5% 3	330
	11th to 20th	Day	21% 11% 38% 22% 6% 1	330
	21st to end	Day	29% 17% 34% 14% 5%	363
January	1st to 10th	Night	20% 14% 37% 25% 4	1050
	11th to 20th	Night	21% 15% 38% 21% 5%	1050
	21st to end	Night	21% 14% 37% 25% 3	1155
February	1st to 10th	Night	24% 12% 36% 26% 2	963
	11th to 20th	Night	21% 15% 37% 24% 3	823
	21st to end	Night	23% 14% 37% 24% 2	692
March	1st to 10th	Night	24% 12% 35% 25% 4	840
	11th to 20th	Night	21% 12% 36% 26% 5%	771
	21st to end	Night	24% 10% 34% 25% 6%	693
April	1st to 10th	Night	17% 15% 33% 30% 5%	603
	11th to 20th	Night	19% 9% 32% 29% 10%	593
	21st to end	Night	24% 6% 35% 28% 7% 1	600
May	1st to 10th	Night	20% 6% 31% 34% 9% 1	600
	11th to 20th	Night	17% 5% 25% 37% 15% 2	591
	21st to end	Night	12% 3 24% 37% 21% 3	650
June	1st to 10th	Night	11% 3 21% 41% 24% 1	600
	11th to 20th	Night	11% 1 20% 46% 21% 1	600
	21st to end	Night	8% 2 21% 40% 28% 1	600
July	1st to 10th	Night	11% 2 9% 34% 36% 8%	585
	11th to 20th	Night	6% 3 13% 41% 33% 4	582
	21st to end	Night	7% 1 12% 44% 33% 4	657
August	1st to 10th	Night	8% 3 11% 40% 34% 5%	597
	11th to 20th	Night	7% 2 11% 41% 34% 5%	594
	21st to end	Night	6% 2 10% 39% 37% 5%	660
September	1st to 10th	Night	13% 1 14% 38% 31% 4	600
	11th to 20th	Night	8% 3 12% 39% 33% 5%	690
	21st to end	Night	14% 4 20% 31% 27% 5%	800
October	1st to 10th	Night	11% 4 22% 37% 23% 4	800
	11th to 20th	Night	18% 10% 28% 30% 14% 1	800
	21st to end	Night	23% 11% 32% 26% 7%	880
November	1st to 10th	Night	12% 8% 38% 31% 11% 1	820
	11th to 20th	Night	18% 12% 35% 27% 8% 1	840
	21st to end	Night	24% 14% 29% 27% 6%	840
December	1st to 10th	Night	23% 10% 35% 27% 4 1	1024
	11th to 20th	Night	23% 9% 34% 28% 6% 1	1050
	21st to end	Night	32% 12% 31% 22% 3	1155

Page generated at 2026-03-30 01:18:42. Version ac07

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