Wildcat Mountain State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Wildcat Mountain State Park clear sky chart from 2005-11-06 to 2025-10-04.

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% 9% 3 8% 5% 4 4 4 6% 7% 38%	126973
	Night	12% 9% 4 9% 5% 4 4 3 5% 6% 38%	122701
Transparency	Day	44% 5% 12% 25% 13% 1	130472
	Night	45% 4 11% 24% 14% 2	127275
Seeing	Day	18% 13% 31% 24% 12% 3	17246
	Night	17% 11% 31% 29% 11% 1	27027

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	6% 11% 6% 19% 8% 7% 5% 3 4 5% 26%	3617
	11th to 20th	Day	6% 11% 7% 11% 6% 4 6% 9% 9% 8% 23%	3620
	21st to end	Day	11% 14% 7% 10% 5% 3 3 2 5% 6% 33%	4281
February	1st to 10th	Day	9% 12% 5% 10% 6% 6% 5% 4 6% 7% 31%	1800
	11th to 20th	Day	11% 11% 5% 8% 6% 4 5% 5% 5% 6% 35%	1805
	21st to end	Day	12% 11% 4 10% 6% 5% 4 3 4 7% 34%	1650
March	1st to 10th	Day	14% 8% 3 5% 3 3 3 3 4 6% 47%	4480
	11th to 20th	Day	11% 6% 2 7% 5% 4 4 3 5% 9% 43%	4975
	21st to end	Day	22% 13% 4 8% 4 3 4 3 4 5% 30%	5778
April	1st to 10th	Day	16% 14% 3 8% 5% 5% 4 4 4 6% 31%	2400
	11th to 20th	Day	18% 12% 3 7% 5% 5% 4 3 5% 6% 31%	2374
	21st to end	Day	19% 11% 4 7% 4 5% 5% 4 6% 5% 31%	2420
May	1st to 10th	Day	15% 7% 2 6% 4 4 4 3 5% 7% 43%	6311
	11th to 20th	Day	14% 6% 3 7% 4 4 4 4 6% 7% 40%	6319
	21st to end	Day	18% 6% 2 6% 4 4 4 4 6% 8% 38%	6935
June	1st to 10th	Day	12% 5% 2 6% 4 4 4 4 7% 9% 44%	2800
	11th to 20th	Day	13% 6% 3 6% 5% 5% 5% 4 6% 8% 40%	2800
	21st to end	Day	14% 7% 2 6% 6% 4 5% 4 6% 8% 39%	2800
July	1st to 10th	Day	9% 5% 2 7% 4 5% 5% 5% 7% 10% 40%	6360
	11th to 20th	Day	7% 5% 2 5% 4 4 5% 4 7% 8% 48%	6360
	21st to end	Day	10% 6% 3 7% 5% 5% 5% 4 6% 8% 41%	6924
August	1st to 10th	Day	9% 6% 3 7% 5% 5% 5% 4 6% 9% 41%	4403
	11th to 20th	Day	13% 5% 3 5% 4 4 4 4 5% 7% 45%	4072
	21st to end	Day	10% 5% 2 6% 4 4 5% 4 7% 9% 43%	4312
September	1st to 10th	Day	13% 6% 2 6% 4 4 4 4 6% 9% 44%	2400
	11th to 20th	Day	12% 6% 2 6% 4 4 4 4 5% 8% 45%	2388
	21st to end	Day	13% 6% 3 6% 4 4 4 4 6% 8% 43%	2155
October	1st to 10th	Day	13% 8% 2 6% 3 4 3 3 4 7% 46%	1930
	11th to 20th	Day	17% 10% 3 5% 4 4 4 4 5% 7% 37%	1900
	21st to end	Day	16% 11% 3 7% 5% 4 4 3 3 5% 38%	1957
November	1st to 10th	Day	13% 9% 3 8% 4 3 3 3 5% 8% 40%	1762
	11th to 20th	Day	13% 13% 5% 11% 6% 4 4 3 5% 7% 30%	1685
	21st to end	Day	13% 11% 4 8% 6% 3 4 2 5% 6% 38%	1600
December	1st to 10th	Day	7% 9% 5% 11% 6% 6% 6% 4 6% 8% 32%	2610
	11th to 20th	Day	13% 16% 6% 9% 7% 5% 4 4 5% 7% 24%	3008
	21st to end	Day	16% 22% 9% 14% 5% 4 4 3 4 4 15%	3982
January	1st to 10th	Night	7% 10% 6% 15% 8% 5% 4 3 5% 6% 31%	6348
	11th to 20th	Night	9% 12% 6% 14% 6% 5% 7% 5% 8% 6% 20%	6360
	21st to end	Night	10% 15% 8% 11% 4 4 4 3 5% 6% 29%	6696
February	1st to 10th	Night	8% 13% 5% 12% 6% 6% 5% 4 5% 5% 32%	2600
	11th to 20th	Night	10% 9% 4 9% 6% 5% 5% 3 5% 5% 39%	2481
	21st to end	Night	14% 11% 3 9% 4 4 4 3 4 6% 36%	1980
March	1st to 10th	Night	13% 8% 3 8% 4 4 4 3 5% 5% 43%	5373
	11th to 20th	Night	9% 8% 3 7% 4 4 5% 4 6% 7% 43%	5027
	21st to end	Night	24% 12% 4 10% 4 4 3 2 4 5% 29%	5150
April	1st to 10th	Night	17% 11% 3 8% 4 4 4 3 4 6% 36%	2000
	11th to 20th	Night	19% 9% 2 6% 4 4 4 2 5% 7% 37%	1975
	21st to end	Night	18% 9% 2 6% 4 4 4 3 7% 6% 36%	1979
May	1st to 10th	Night	15% 7% 3 6% 3 5% 4 4 5% 6% 43%	3601
	11th to 20th	Night	10% 6% 2 5% 4 3 4 3 5% 8% 50%	3596
	21st to end	Night	15% 8% 3 6% 4 5% 4 3 6% 7% 38%	3942
June	1st to 10th	Night	10% 5% 3 7% 4 3 4 4 7% 9% 46%	1600
	11th to 20th	Night	11% 6% 2 8% 4 4 4 3 5% 8% 45%	1600
	21st to end	Night	10% 6% 2 5% 4 4 3 4 5% 8% 48%	1600
July	1st to 10th	Night	12% 6% 2 6% 4 3 4 3 6% 8% 46%	3618
	11th to 20th	Night	7% 5% 1 4 4 3 5% 3 6% 8% 54%	3617
	21st to end	Night	7% 5% 2 6% 3 5% 5% 5% 6% 8% 47%	3947
August	1st to 10th	Night	10% 5% 2 5% 4 4 5% 3 6% 7% 49%	2753
	11th to 20th	Night	11% 6% 2 5% 4 4 3 3 5% 7% 50%	2984
	21st to end	Night	10% 6% 2 5% 4 3 5% 3 5% 7% 50%	3586
September	1st to 10th	Night	9% 6% 2 5% 3 4 3 3 5% 7% 53%	2000
	11th to 20th	Night	12% 5% 2 5% 3 4 3 3 6% 6% 52%	2000
	21st to end	Night	11% 6% 2 5% 4 4 3 3 4 6% 53%	2231
October	1st to 10th	Night	13% 6% 2 5% 3 3 4 4 5% 6% 50%	2317
	11th to 20th	Night	16% 8% 3 7% 4 3 4 3 5% 7% 41%	2280
	21st to end	Night	17% 10% 4 6% 4 3 5% 4 5% 6% 36%	2639
November	1st to 10th	Night	14% 9% 3 6% 4 3 4 3 5% 5% 43%	2536
	11th to 20th	Night	12% 12% 4 10% 7% 4 4 3 5% 6% 33%	2710
	21st to end	Night	15% 11% 4 9% 5% 3 4 3 4 5% 36%	2800
December	1st to 10th	Night	7% 8% 3 10% 6% 6% 6% 4 7% 8% 35%	4580
	11th to 20th	Night	12% 18% 7% 13% 6% 5% 4 3 4 5% 23%	5199
	21st to end	Night	19% 17% 7% 14% 6% 4 4 3 4 5% 17%	6996

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	61% 3 10% 18% 8%	3618
	11th to 20th	Day	53% 3 9% 16% 18%	3620
	21st to end	Day	53% 3 13% 19% 12%	4281
February	1st to 10th	Day	52% 4 13% 18% 12% 1	1800
	11th to 20th	Day	50% 3 12% 23% 10% 2	1814
	21st to end	Day	52% 3 10% 21% 11% 3	1650
March	1st to 10th	Day	39% 3 12% 28% 14% 5%	4480
	11th to 20th	Day	39% 4 14% 29% 13% 2	4975
	21st to end	Day	58% 3 10% 15% 13% 2	5780
April	1st to 10th	Day	54% 5% 10% 20% 11% 1	2400
	11th to 20th	Day	54% 4 8% 22% 10% 2	2374
	21st to end	Day	54% 5% 11% 18% 11% 1	2420
May	1st to 10th	Day	41% 4 8% 27% 17% 3	6349
	11th to 20th	Day	42% 6% 9% 28% 14% 1	6323
	21st to end	Day	44% 4 9% 28% 13% 1	6949
June	1st to 10th	Day	37% 5% 14% 28% 15% 2	2800
	11th to 20th	Day	41% 6% 14% 23% 16% 1	2800
	21st to end	Day	42% 6% 14% 24% 13% 2	2800
July	1st to 10th	Day	36% 7% 17% 32% 7% 1	6291
	11th to 20th	Day	31% 7% 15% 31% 15% 1	6285
	21st to end	Day	39% 7% 13% 24% 17% 1	6728
August	1st to 10th	Day	38% 6% 15% 27% 13% 1	4388
	11th to 20th	Day	37% 5% 12% 32% 13%	4111
	21st to end	Day	35% 6% 14% 31% 13% 1	4311
September	1st to 10th	Day	37% 6% 13% 27% 17% 1	2400
	11th to 20th	Day	37% 5% 14% 32% 12% 1	2388
	21st to end	Day	38% 4 11% 32% 14% 1	2155
October	1st to 10th	Day	24% 3 7% 42% 22% 1	3190
	11th to 20th	Day	37% 3 10% 27% 20% 2	3140
	21st to end	Day	44% 3 11% 29% 12% 1	3208
November	1st to 10th	Day	43% 4 13% 23% 15% 2	1762
	11th to 20th	Day	55% 3 12% 21% 9% 1	1685
	21st to end	Day	49% 4 15% 23% 9% 1	1600
December	1st to 10th	Day	48% 6% 17% 21% 8% 1	2610
	11th to 20th	Day	60% 3 12% 17% 7% 1	3005
	21st to end	Day	73% 3 7% 12% 5%	3982
January	1st to 10th	Night	54% 4 9% 22% 10% 1	6348
	11th to 20th	Night	60% 4 8% 13% 15%	6360
	21st to end	Night	55% 3 11% 18% 12%	6696
February	1st to 10th	Night	54% 3 11% 20% 11% 2	2600
	11th to 20th	Night	47% 4 11% 24% 12% 2	2482
	21st to end	Night	50% 3 11% 21% 12% 2	1980
March	1st to 10th	Night	44% 3 11% 25% 11% 6%	5373
	11th to 20th	Night	39% 4 11% 29% 14% 3	5027
	21st to end	Night	59% 3 8% 17% 11% 1	5150
April	1st to 10th	Night	50% 3 8% 23% 14% 2	2000
	11th to 20th	Night	48% 3 9% 21% 16% 3	1975
	21st to end	Night	46% 6% 11% 21% 14% 2	1979
May	1st to 10th	Night	42% 4 9% 22% 20% 2	3625
	11th to 20th	Night	33% 4 14% 25% 21% 3	3597
	21st to end	Night	44% 5% 9% 27% 14% 1	3950
June	1st to 10th	Night	34% 7% 12% 30% 16% 2	1600
	11th to 20th	Night	37% 5% 12% 26% 18% 2	1600
	21st to end	Night	33% 6% 14% 27% 16% 4	1600
July	1st to 10th	Night	34% 6% 16% 30% 12% 2	3580
	11th to 20th	Night	28% 5% 15% 34% 17% 1	3572
	21st to end	Night	32% 6% 17% 25% 19% 2	3832
August	1st to 10th	Night	33% 6% 13% 29% 18% 2	2744
	11th to 20th	Night	33% 5% 14% 31% 15% 1	3011
	21st to end	Night	33% 6% 14% 27% 18% 2	3586
September	1st to 10th	Night	31% 6% 11% 31% 21% 1	2000
	11th to 20th	Night	33% 4 13% 34% 16% 1	2000
	21st to end	Night	33% 4 10% 31% 21% 1	2231
October	1st to 10th	Night	26% 3 6% 36% 27% 2	3837
	11th to 20th	Night	31% 4 11% 29% 24% 1	3779
	21st to end	Night	45% 4 10% 26% 15% 1	4338
November	1st to 10th	Night	43% 4 11% 25% 15% 2	2536
	11th to 20th	Night	53% 4 13% 18% 11% 1	2710
	21st to end	Night	51% 4 12% 24% 8% 1	2800
December	1st to 10th	Night	44% 6% 19% 25% 7%	4580
	11th to 20th	Night	64% 3 9% 15% 8%	5201
	21st to end	Night	69% 3 7% 14% 7%	6996

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	16% 19% 34% 21% 8% 2	300
	11th to 20th	Day	19% 22% 39% 13% 5% 1	300
	21st to end	Day	21% 18% 37% 19% 5%	330
February	1st to 10th	Day	17% 22% 41% 14% 4 2	300
	11th to 20th	Day	19% 26% 37% 13% 5%	300
	21st to end	Day	22% 22% 41% 13% 2	249
March	1st to 10th	Day	22% 21% 41% 12% 4	300
	11th to 20th	Day	22% 21% 32% 18% 6% 2	300
	21st to end	Day	28% 15% 31% 17% 7% 1	465
April	1st to 10th	Day	28% 16% 35% 17% 4	500
	11th to 20th	Day	31% 16% 28% 16% 8% 2	492
	21st to end	Day	26% 15% 31% 18% 7% 2	500
May	1st to 10th	Day	20% 15% 32% 25% 6% 2	695
	11th to 20th	Day	20% 14% 28% 24% 11% 3	725
	21st to end	Day	20% 12% 27% 24% 12% 4	789
June	1st to 10th	Day	12% 8% 30% 32% 15% 3	730
	11th to 20th	Day	17% 9% 35% 26% 12% 2	730
	21st to end	Day	18% 9% 30% 27% 12% 4	730
July	1st to 10th	Day	10% 4 23% 31% 24% 9%	721
	11th to 20th	Day	9% 7% 28% 31% 19% 7%	718
	21st to end	Day	7% 5% 28% 36% 16% 7%	794
August	1st to 10th	Day	8% 5% 25% 31% 23% 8%	726
	11th to 20th	Day	16% 5% 22% 27% 22% 8%	655
	21st to end	Day	12% 8% 26% 28% 19% 7%	583
September	1st to 10th	Day	17% 8% 24% 29% 16% 6%	530
	11th to 20th	Day	13% 6% 24% 32% 20% 5%	530
	21st to end	Day	18% 13% 27% 26% 15% 3	485
October	1st to 10th	Day	15% 15% 32% 25% 12% 1	309
	11th to 20th	Day	23% 20% 35% 16% 6%	300
	21st to end	Day	25% 21% 32% 17% 4 1	330
November	1st to 10th	Day	20% 15% 39% 19% 5% 1	300
	11th to 20th	Day	23% 19% 38% 15% 4	300
	21st to end	Day	23% 18% 40% 15% 4	300
December	1st to 10th	Day	14% 21% 41% 18% 5% 1	300
	11th to 20th	Day	22% 19% 35% 20% 4	300
	21st to end	Day	29% 17% 36% 14% 3	330
January	1st to 10th	Night	14% 18% 36% 25% 7% 1	1000
	11th to 20th	Night	18% 16% 38% 24% 4 1	1000
	21st to end	Night	18% 13% 37% 26% 6%	1100
February	1st to 10th	Night	16% 16% 36% 25% 5% 1	1000
	11th to 20th	Night	15% 19% 38% 23% 6%	927
	21st to end	Night	21% 17% 35% 23% 4	660
March	1st to 10th	Night	18% 16% 36% 24% 6% 1	800
	11th to 20th	Night	18% 15% 35% 25% 8%	621
	21st to end	Night	24% 9% 30% 29% 7% 2	660
April	1st to 10th	Night	22% 14% 37% 22% 6%	600
	11th to 20th	Night	24% 11% 31% 27% 6%	593
	21st to end	Night	22% 11% 32% 27% 8% 1	600
May	1st to 10th	Night	21% 8% 33% 32% 6% 1	600
	11th to 20th	Night	17% 8% 30% 33% 11%	591
	21st to end	Night	16% 7% 28% 34% 14% 1	650
June	1st to 10th	Night	12% 7% 28% 42% 11%	600
	11th to 20th	Night	14% 5% 32% 37% 12%	600
	21st to end	Night	13% 6% 26% 40% 16% 1	600
July	1st to 10th	Night	8% 3 18% 40% 30% 2	585
	11th to 20th	Night	8% 5% 20% 43% 21% 3	582
	21st to end	Night	6% 2 18% 48% 22% 3	657
August	1st to 10th	Night	8% 2 17% 46% 26% 2	597
	11th to 20th	Night	11% 3 18% 37% 26% 5%	594
	21st to end	Night	12% 4 18% 40% 24% 3	660
September	1st to 10th	Night	12% 5% 25% 36% 17% 6%	600
	11th to 20th	Night	13% 4 25% 32% 22% 4	600
	21st to end	Night	13% 9% 27% 34% 15% 2	791
October	1st to 10th	Night	15% 9% 29% 29% 17% 1	773
	11th to 20th	Night	20% 12% 33% 27% 8%	760
	21st to end	Night	22% 12% 33% 26% 7% 1	836
November	1st to 10th	Night	19% 10% 36% 26% 8% 1	780
	11th to 20th	Night	18% 17% 39% 20% 6%	910
	21st to end	Night	20% 16% 34% 24% 7%	1000
December	1st to 10th	Night	19% 14% 40% 22% 5% 1	1000
	11th to 20th	Night	21% 16% 36% 22% 5%	1000
	21st to end	Night	26% 16% 32% 21% 5%	1100

Page generated at 2025-10-01 00:39:09. Version ac07

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