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 2024-01-16.

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	13% 8% 3 6% 5% 3 5% 5% 5% 8% 39%	74829
	Night	14% 8% 3 6% 5% 3 4 4 5% 7% 42%	75004
Transparency	Day	42% 6% 12% 23% 14% 2	74530
	Night	42% 6% 11% 23% 16% 3	74824
Seeing	Day	16% 7% 26% 26% 18% 7%	14498
	Night	18% 8% 28% 31% 14% 2	24451

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	14% 13% 5% 9% 7% 4 5% 5% 5% 6% 28%	1517
	11th to 20th	Day	17% 14% 6% 9% 8% 4 4 3 4 5% 26%	1485
	21st to end	Day	13% 13% 6% 10% 7% 4 3 4 5% 6% 29%	1750
February	1st to 10th	Day	17% 11% 5% 10% 7% 4 3 5% 4 7% 27%	1692
	11th to 20th	Day	15% 9% 4 8% 8% 4 5% 5% 5% 8% 29%	1748
	21st to end	Day	18% 13% 4 7% 6% 3 4 4 5% 6% 30%	1480
March	1st to 10th	Day	16% 10% 4 6% 5% 3 4 4 4 7% 37%	1800
	11th to 20th	Day	16% 11% 4 7% 5% 3 4 3 5% 7% 34%	1874
	21st to end	Day	22% 11% 5% 6% 5% 4 5% 4 4 6% 28%	2372
April	1st to 10th	Day	13% 7% 4 6% 5% 3 6% 4 6% 8% 38%	2160
	11th to 20th	Day	16% 9% 3 6% 5% 3 4 4 4 6% 40%	2134
	21st to end	Day	20% 8% 3 6% 4 3 4 4 5% 6% 37%	2166
May	1st to 10th	Day	17% 7% 3 6% 6% 4 5% 5% 6% 9% 33%	2340
	11th to 20th	Day	18% 7% 3 5% 5% 4 5% 5% 5% 7% 37%	2352
	21st to end	Day	9% 6% 3 6% 6% 4 6% 6% 7% 10% 37%	2725
June	1st to 10th	Day	8% 4 2 4 6% 3 5% 6% 7% 10% 45%	2520
	11th to 20th	Day	8% 4 2 5% 6% 3 5% 5% 7% 9% 47%	2520
	21st to end	Day	7% 5% 3 5% 5% 3 6% 6% 8% 11% 42%	2520
July	1st to 10th	Day	10% 4 2 4 5% 3 6% 7% 8% 11% 41%	2520
	11th to 20th	Day	6% 4 2 4 5% 3 6% 7% 7% 11% 46%	2520
	21st to end	Day	8% 3 1 4 5% 3 6% 6% 6% 11% 47%	2743
August	1st to 10th	Day	9% 5% 2 4 5% 3 4 5% 7% 10% 47%	2292
	11th to 20th	Day	8% 4 2 5% 5% 4 6% 6% 6% 11% 42%	2125
	21st to end	Day	7% 4 2 5% 5% 3 4 5% 7% 8% 51%	2376
September	1st to 10th	Day	12% 5% 2 6% 5% 3 4 5% 5% 7% 46%	2160
	11th to 20th	Day	9% 4 2 6% 5% 3 5% 5% 5% 7% 49%	2062
	21st to end	Day	9% 5% 2 4 4 3 4 4 5% 8% 53%	1980
October	1st to 10th	Day	11% 4 2 4 4 2 3 5% 5% 8% 50%	1922
	11th to 20th	Day	16% 7% 2 5% 4 2 4 4 5% 6% 45%	1800
	21st to end	Day	18% 8% 3 6% 4 2 3 3 5% 6% 41%	1842
November	1st to 10th	Day	10% 6% 2 4 3 2 3 4 5% 7% 53%	1672
	11th to 20th	Day	17% 7% 3 5% 4 2 4 3 4 8% 42%	1710
	21st to end	Day	16% 9% 5% 6% 6% 2 4 3 4 5% 39%	1710
December	1st to 10th	Day	16% 12% 5% 6% 5% 4 4 4 5% 7% 31%	1539
	11th to 20th	Day	15% 12% 5% 10% 6% 3 4 5% 6% 7% 28%	1918
	21st to end	Day	23% 17% 6% 12% 5% 3 4 4 4 5% 18%	2783
January	1st to 10th	Night	13% 11% 5% 8% 6% 3 5% 5% 4 6% 33%	2648
	11th to 20th	Night	16% 12% 6% 10% 6% 3 4 4 4 5% 31%	2603
	21st to end	Night	15% 11% 6% 9% 6% 3 4 4 4 6% 31%	2605
February	1st to 10th	Night	18% 12% 6% 8% 5% 3 4 4 4 6% 30%	2266
	11th to 20th	Night	16% 7% 5% 8% 6% 3 4 4 5% 7% 36%	2098
	21st to end	Night	20% 10% 3 6% 5% 2 4 3 4 6% 36%	1776
March	1st to 10th	Night	17% 9% 4 7% 5% 2 4 4 4 6% 38%	2160
	11th to 20th	Night	18% 8% 4 6% 5% 3 5% 4 4 6% 38%	2102
	21st to end	Night	20% 9% 3 7% 5% 2 4 4 5% 7% 33%	1982
April	1st to 10th	Night	13% 6% 3 6% 5% 3 5% 4 4 7% 45%	1800
	11th to 20th	Night	16% 8% 3 5% 4 2 3 3 4 6% 46%	1775
	21st to end	Night	19% 7% 2 6% 5% 3 5% 4 5% 6% 37%	1792
May	1st to 10th	Night	17% 6% 3 6% 4 2 4 4 6% 8% 39%	1620
	11th to 20th	Night	15% 6% 3 6% 6% 3 4 4 5% 7% 41%	1540
	21st to end	Night	8% 6% 3 7% 7% 3 7% 5% 7% 9% 40%	1551
June	1st to 10th	Night	8% 4 2 5% 5% 2 5% 5% 6% 9% 49%	1440
	11th to 20th	Night	7% 4 2 5% 5% 3 4 4 6% 8% 53%	1440
	21st to end	Night	6% 5% 3 5% 5% 3 5% 5% 7% 10% 46%	1440
July	1st to 10th	Night	9% 4 2 4 4 4 4 5% 5% 9% 50%	1440
	11th to 20th	Night	5% 5% 2 3 4 3 5% 4 6% 9% 56%	1440
	21st to end	Night	5% 4 2 4 3 3 4 4 7% 9% 54%	1575
August	1st to 10th	Night	8% 4 2 4 4 2 4 6% 7% 9% 50%	1642
	11th to 20th	Night	6% 4 2 5% 4 3 5% 6% 7% 7% 50%	1776
	21st to end	Night	6% 3 2 3 4 2 4 5% 6% 8% 58%	1980
September	1st to 10th	Night	11% 5% 2 4 4 2 4 3 5% 8% 52%	1800
	11th to 20th	Night	7% 5% 2 4 4 3 4 4 5% 9% 54%	1880
	21st to end	Night	9% 5% 2 4 4 2 3 5% 4 7% 55%	1980
October	1st to 10th	Night	10% 3 1 4 5% 2 3 4 5% 7% 55%	2036
	11th to 20th	Night	15% 6% 3 4 3 3 3 3 4 6% 50%	2160
	21st to end	Night	18% 9% 3 4 4 2 4 3 5% 5% 41%	2512
November	1st to 10th	Night	10% 5% 2 5% 4 3 4 4 5% 5% 53%	2406
	11th to 20th	Night	14% 7% 3 5% 5% 2 4 3 5% 6% 46%	2470
	21st to end	Night	18% 8% 4 6% 5% 3 3 4 4 6% 41%	2470
December	1st to 10th	Night	17% 9% 3 7% 6% 3 5% 5% 4 8% 33%	2636
	11th to 20th	Night	17% 9% 5% 8% 5% 2 4 4 3 5% 38%	3279
	21st to end	Night	26% 16% 6% 8% 6% 3 4 4 3 4 19%	4884

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	55% 6% 9% 17% 12% 1	1518
	11th to 20th	Day	61% 5% 8% 19% 7% 1	1485
	21st to end	Day	55% 5% 12% 20% 7% 1	1750
February	1st to 10th	Day	55% 6% 12% 18% 8% 1	1692
	11th to 20th	Day	53% 6% 11% 21% 9% 1	1758
	21st to end	Day	54% 5% 8% 22% 8% 2	1480
March	1st to 10th	Day	48% 5% 10% 24% 11% 1	1800
	11th to 20th	Day	50% 6% 12% 22% 9% 1	1874
	21st to end	Day	57% 6% 11% 20% 6% 1	2372
April	1st to 10th	Day	43% 6% 13% 24% 14%	2160
	11th to 20th	Day	46% 5% 11% 24% 12% 3	2134
	21st to end	Day	47% 5% 12% 22% 10% 3	2166
May	1st to 10th	Day	48% 7% 15% 21% 8% 1	2340
	11th to 20th	Day	45% 7% 13% 19% 14% 1	2356
	21st to end	Day	40% 9% 15% 20% 14% 2	2725
June	1st to 10th	Day	32% 9% 15% 26% 15% 3	2520
	11th to 20th	Day	32% 7% 12% 25% 21% 3	2520
	21st to end	Day	33% 8% 17% 23% 15% 3	2520
July	1st to 10th	Day	33% 9% 15% 26% 14% 3	2451
	11th to 20th	Day	29% 9% 16% 28% 16% 2	2445
	21st to end	Day	30% 9% 15% 28% 16% 2	2591
August	1st to 10th	Day	31% 8% 15% 31% 14% 1	2277
	11th to 20th	Day	34% 9% 15% 27% 13% 2	2125
	21st to end	Day	28% 7% 14% 26% 18% 6%	2376
September	1st to 10th	Day	37% 7% 11% 24% 18% 4	2160
	11th to 20th	Day	33% 6% 10% 25% 24% 3	2062
	21st to end	Day	30% 5% 10% 28% 24% 3	1980
October	1st to 10th	Day	32% 5% 13% 27% 20% 3	1922
	11th to 20th	Day	39% 5% 9% 22% 22% 3	1800
	21st to end	Day	45% 4 10% 25% 15% 2	1842
November	1st to 10th	Day	31% 4 13% 28% 19% 5%	1672
	11th to 20th	Day	42% 4 9% 24% 16% 4	1710
	21st to end	Day	48% 4 10% 23% 13% 1	1710
December	1st to 10th	Day	51% 7% 12% 19% 10% 1	1539
	11th to 20th	Day	53% 6% 9% 24% 6% 1	1915
	21st to end	Day	68% 6% 9% 11% 5%	2783
January	1st to 10th	Night	52% 5% 7% 21% 14% 1	2648
	11th to 20th	Night	57% 4 9% 21% 9%	2603
	21st to end	Night	53% 5% 11% 20% 9% 1	2605
February	1st to 10th	Night	56% 4 12% 17% 9% 1	2266
	11th to 20th	Night	48% 5% 10% 22% 14% 2	2099
	21st to end	Night	51% 4 11% 22% 10% 3	1776
March	1st to 10th	Night	48% 5% 9% 21% 15% 1	2160
	11th to 20th	Night	47% 6% 12% 21% 13% 2	2102
	21st to end	Night	52% 5% 11% 21% 9% 2	1982
April	1st to 10th	Night	40% 5% 11% 25% 16% 2	1800
	11th to 20th	Night	40% 4 10% 23% 19% 4	1775
	21st to end	Night	48% 6% 10% 20% 13% 3	1792
May	1st to 10th	Night	43% 6% 14% 24% 11% 2	1620
	11th to 20th	Night	42% 7% 13% 22% 15% 1	1541
	21st to end	Night	38% 8% 14% 19% 16% 5%	1552
June	1st to 10th	Night	31% 8% 12% 25% 20% 4	1440
	11th to 20th	Night	28% 6% 12% 26% 23% 5%	1440
	21st to end	Night	31% 8% 15% 24% 17% 6%	1440
July	1st to 10th	Night	32% 7% 16% 25% 16% 5%	1400
	11th to 20th	Night	24% 6% 16% 30% 19% 4	1392
	21st to end	Night	25% 7% 14% 29% 21% 3	1487
August	1st to 10th	Night	26% 9% 15% 29% 18% 2	1633
	11th to 20th	Night	30% 8% 13% 28% 19% 2	1776
	21st to end	Night	22% 9% 15% 26% 21% 7%	1980
September	1st to 10th	Night	31% 5% 10% 28% 20% 7%	1800
	11th to 20th	Night	28% 5% 9% 28% 25% 5%	1880
	21st to end	Night	29% 5% 10% 25% 27% 5%	1980
October	1st to 10th	Night	28% 6% 11% 26% 24% 5%	2036
	11th to 20th	Night	36% 4 8% 26% 23% 4	2160
	21st to end	Night	44% 5% 8% 22% 17% 3	2512
November	1st to 10th	Night	33% 4 11% 25% 21% 7%	2406
	11th to 20th	Night	38% 5% 9% 26% 20% 2	2470
	21st to end	Night	46% 4 10% 24% 15% 1	2470
December	1st to 10th	Night	50% 5% 12% 20% 12% 1	2636
	11th to 20th	Night	48% 5% 11% 22% 13% 1	3281
	21st to end	Night	68% 6% 8% 12% 6% 1	4884

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	22% 14% 34% 22% 7% 1	270
	11th to 20th	Day	28% 12% 35% 20% 4	257
	21st to end	Day	17% 16% 44% 17% 5%	264
February	1st to 10th	Day	29% 16% 35% 18% 3	240
	11th to 20th	Day	25% 18% 33% 19% 3 1	240
	21st to end	Day	30% 10% 39% 18% 3	198
March	1st to 10th	Day	21% 18% 37% 20% 5%	240
	11th to 20th	Day	29% 13% 36% 17% 5%	240
	21st to end	Day	31% 11% 34% 16% 7% 1	458
April	1st to 10th	Day	17% 13% 36% 24% 8% 2	420
	11th to 20th	Day	23% 13% 28% 21% 12% 2	412
	21st to end	Day	25% 9% 36% 20% 8% 2	420
May	1st to 10th	Day	18% 10% 33% 28% 8% 3	423
	11th to 20th	Day	19% 7% 25% 28% 17% 4	498
	21st to end	Day	12% 2 28% 31% 17% 9%	679
June	1st to 10th	Day	9% 5% 20% 31% 27% 8%	630
	11th to 20th	Day	10% 4 22% 35% 22% 7%	630
	21st to end	Day	9% 4 25% 32% 23% 8%	630
July	1st to 10th	Day	12% 2 10% 29% 28% 19%	621
	11th to 20th	Day	7% 2 14% 35% 28% 14%	618
	21st to end	Day	9% 1 15% 32% 33% 10%	684
August	1st to 10th	Day	9% 2 11% 33% 31% 13%	536
	11th to 20th	Day	10% 3 16% 26% 29% 15%	439
	21st to end	Day	7% 2 11% 30% 37% 13%	495
September	1st to 10th	Day	13% 2 16% 29% 29% 10%	450
	11th to 20th	Day	8% 2 11% 31% 34% 14%	450
	21st to end	Day	10% 5% 26% 24% 24% 12%	450
October	1st to 10th	Day	13% 4 26% 32% 20% 6%	392
	11th to 20th	Day	18% 14% 34% 24% 8% 1	270
	21st to end	Day	29% 10% 33% 23% 4	297
November	1st to 10th	Day	14% 9% 33% 25% 14% 5%	270
	11th to 20th	Day	21% 14% 32% 23% 7% 2	270
	21st to end	Day	22% 11% 34% 23% 9%	270
December	1st to 10th	Day	17% 12% 41% 21% 5% 4	270
	11th to 20th	Day	21% 11% 38% 23% 7% 1	270
	21st to end	Day	28% 19% 33% 14% 6%	297
January	1st to 10th	Night	20% 13% 36% 26% 5%	950
	11th to 20th	Night	22% 13% 37% 22% 5%	930
	21st to end	Night	21% 13% 38% 26% 3	990
February	1st to 10th	Night	26% 12% 35% 25% 2	826
	11th to 20th	Night	20% 15% 37% 25% 3	703
	21st to end	Night	26% 14% 35% 24% 2	592
March	1st to 10th	Night	23% 11% 35% 26% 4	720
	11th to 20th	Night	22% 11% 35% 27% 6%	662
	21st to end	Night	25% 9% 32% 26% 7%	594
April	1st to 10th	Night	16% 14% 33% 31% 6%	540
	11th to 20th	Night	19% 9% 32% 29% 11%	533
	21st to end	Night	25% 6% 34% 27% 7% 1	540
May	1st to 10th	Night	19% 6% 31% 35% 9% 1	540
	11th to 20th	Night	17% 5% 25% 37% 14% 2	531
	21st to end	Night	12% 3 24% 37% 22% 3	584
June	1st to 10th	Night	10% 3 20% 41% 26% 1	540
	11th to 20th	Night	10% 1 20% 46% 22% 1	540
	21st to end	Night	8% 2 21% 40% 28% 1	540
July	1st to 10th	Night	11% 1 9% 33% 37% 8%	525
	11th to 20th	Night	5% 3 12% 41% 34% 4	522
	21st to end	Night	6% 2 12% 44% 33% 3	591
August	1st to 10th	Night	8% 3 9% 40% 35% 5%	537
	11th to 20th	Night	6% 2 11% 40% 36% 5%	534
	21st to end	Night	6% 2 11% 37% 38% 6%	594
September	1st to 10th	Night	14% 1 12% 38% 30% 4	540
	11th to 20th	Night	8% 3 13% 39% 31% 5%	620
	21st to end	Night	12% 4 21% 31% 27% 5%	720
October	1st to 10th	Night	12% 4 22% 36% 22% 3	720
	11th to 20th	Night	18% 11% 29% 29% 13% 1	720
	21st to end	Night	24% 10% 31% 27% 7%	792
November	1st to 10th	Night	12% 7% 38% 31% 11% 1	740
	11th to 20th	Night	18% 13% 34% 27% 8% 1	760
	21st to end	Night	23% 13% 29% 28% 7%	760
December	1st to 10th	Night	23% 10% 35% 27% 5% 1	926
	11th to 20th	Night	23% 7% 33% 30% 6% 1	950
	21st to end	Night	31% 13% 31% 22% 3	1045

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