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 2024-04-25.

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% 4 7% 6% 3 5% 5% 5% 7% 36%	83243
	Night	13% 9% 4 8% 6% 3 4 4 5% 6% 37%	85933
Transparency	Day	47% 5% 12% 23% 12% 1	82943
	Night	47% 4 11% 24% 12% 2	85753
Seeing	Day	18% 13% 31% 24% 12% 3	15104
	Night	17% 11% 32% 29% 10% 1	25168

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	9% 15% 9% 16% 8% 4 4 3 4 4 24%	2527
	11th to 20th	Day	9% 12% 5% 11% 8% 3 6% 11% 8% 7% 19%	2530
	21st to end	Day	16% 17% 9% 11% 6% 3 4 3 5% 6% 22%	2984
February	1st to 10th	Day	9% 12% 6% 9% 6% 4 6% 5% 5% 7% 31%	1710
	11th to 20th	Day	11% 10% 5% 7% 6% 3 5% 6% 6% 6% 35%	1712
	21st to end	Day	12% 10% 5% 9% 6% 4 5% 4 4 8% 33%	1570
March	1st to 10th	Day	15% 7% 4 5% 3 3 3 3 3 6% 46%	3120
	11th to 20th	Day	10% 7% 3 8% 6% 3 5% 4 4 8% 43%	3475
	21st to end	Day	21% 14% 4 7% 6% 2 4 4 4 6% 28%	4032
April	1st to 10th	Day	17% 12% 4 7% 6% 3 4 5% 4 6% 32%	2280
	11th to 20th	Day	18% 11% 4 6% 5% 4 4 4 4 6% 32%	2254
	21st to end	Day	20% 10% 4 6% 5% 3 5% 5% 6% 5% 31%	2227
May	1st to 10th	Day	16% 8% 4 6% 7% 4 6% 5% 7% 8% 30%	2512
	11th to 20th	Day	17% 7% 3 7% 6% 3 4 5% 6% 8% 33%	2479
	21st to end	Day	16% 6% 3 6% 6% 3 5% 6% 6% 7% 36%	2725
June	1st to 10th	Day	12% 5% 3 4 5% 3 4 4 7% 9% 45%	2520
	11th to 20th	Day	12% 6% 3 4 6% 4 5% 5% 5% 8% 42%	2520
	21st to end	Day	12% 6% 2 6% 6% 3 5% 5% 6% 8% 40%	2520
July	1st to 10th	Day	8% 3 2 5% 4 3 6% 7% 7% 9% 47%	2520
	11th to 20th	Day	7% 4 2 5% 6% 4 5% 5% 7% 9% 45%	2520
	21st to end	Day	8% 3 2 4 5% 3 5% 5% 7% 10% 46%	2743
August	1st to 10th	Day	6% 5% 3 6% 6% 4 5% 6% 8% 11% 40%	2422
	11th to 20th	Day	14% 6% 3 5% 5% 3 5% 6% 6% 8% 41%	2247
	21st to end	Day	11% 6% 2 5% 5% 3 4 4 6% 7% 46%	2376
September	1st to 10th	Day	14% 6% 2 5% 5% 3 4 5% 5% 8% 43%	2160
	11th to 20th	Day	12% 6% 2 5% 5% 3 4 4 5% 7% 45%	2150
	21st to end	Day	14% 6% 3 5% 5% 3 4 5% 6% 8% 41%	1940
October	1st to 10th	Day	14% 8% 2 5% 4 3 4 4 5% 7% 44%	1800
	11th to 20th	Day	18% 10% 3 4 5% 3 4 5% 5% 7% 36%	1800
	21st to end	Day	17% 11% 4 6% 6% 3 4 3 3 5% 38%	1854
November	1st to 10th	Day	12% 9% 3 7% 5% 2 4 4 5% 8% 41%	1672
	11th to 20th	Day	14% 12% 5% 9% 7% 3 4 4 4 7% 31%	1601
	21st to end	Day	13% 9% 5% 7% 6% 3 5% 3 4 6% 39%	1520
December	1st to 10th	Day	13% 12% 5% 9% 7% 3 5% 5% 5% 7% 30%	1520
	11th to 20th	Day	12% 13% 7% 7% 7% 4 5% 4 5% 8% 28%	1918
	21st to end	Day	18% 20% 9% 11% 6% 3 4 3 3 4 18%	2783
January	1st to 10th	Night	10% 12% 8% 13% 8% 4 5% 3 4 4 29%	4428
	11th to 20th	Night	10% 13% 6% 13% 9% 4 5% 7% 8% 5% 20%	4440
	21st to end	Night	15% 17% 8% 11% 5% 3 5% 4 4 5% 22%	4682
February	1st to 10th	Night	8% 12% 6% 10% 8% 4 6% 5% 4 5% 32%	2470
	11th to 20th	Night	10% 8% 4 7% 6% 4 6% 4 5% 6% 40%	2354
	21st to end	Night	14% 11% 4 8% 6% 3 4 4 5% 6% 36%	1884
March	1st to 10th	Night	13% 8% 3 6% 5% 3 4 4 5% 6% 42%	3733
	11th to 20th	Night	10% 7% 3 6% 5% 4 5% 5% 6% 7% 42%	3513
	21st to end	Night	25% 10% 4 10% 5% 3 3 3 4 5% 29%	3598
April	1st to 10th	Night	18% 10% 4 7% 5% 3 4 4 4 6% 36%	1900
	11th to 20th	Night	20% 8% 3 5% 5% 3 4 4 5% 8% 38%	1875
	21st to end	Night	18% 8% 2 5% 5% 3 5% 4 7% 6% 36%	1832
May	1st to 10th	Night	18% 8% 2 6% 5% 3 5% 5% 5% 9% 34%	1445
	11th to 20th	Night	14% 8% 4 6% 5% 3 4 4 5% 8% 40%	1416
	21st to end	Night	12% 7% 2 5% 5% 3 4 4 7% 9% 43%	1551
June	1st to 10th	Night	10% 4 3 6% 5% 2 4 5% 7% 9% 46%	1440
	11th to 20th	Night	10% 5% 2 6% 5% 3 4 4 5% 8% 47%	1440
	21st to end	Night	9% 5% 3 4 4 2 4 5% 5% 9% 50%	1440
July	1st to 10th	Night	6% 4 1 4 3 2 4 5% 5% 8% 57%	1440
	11th to 20th	Night	7% 4 2 3 5% 3 4 5% 6% 8% 54%	1440
	21st to end	Night	6% 3 2 3 3 3 5% 5% 7% 9% 54%	1575
August	1st to 10th	Night	5% 4 1 4 4 3 6% 4 7% 10% 51%	1513
	11th to 20th	Night	10% 5% 2 5% 4 3 3 4 5% 7% 52%	1654
	21st to end	Night	10% 4 2 3 4 2 4 4 5% 7% 53%	1980
September	1st to 10th	Night	10% 6% 2 4 4 3 3 5% 4 7% 51%	1800
	11th to 20th	Night	13% 4 2 4 3 3 3 3 5% 6% 54%	1800
	21st to end	Night	12% 6% 2 4 4 3 4 4 4 6% 51%	2007
October	1st to 10th	Night	13% 6% 2 5% 4 2 4 4 5% 6% 49%	2160
	11th to 20th	Night	16% 7% 3 6% 4 2 4 5% 5% 7% 40%	2160
	21st to end	Night	17% 10% 4 5% 5% 2 4 5% 5% 6% 36%	2500
November	1st to 10th	Night	14% 8% 4 6% 4 2 4 4 5% 5% 44%	2406
	11th to 20th	Night	13% 10% 4 9% 8% 4 4 4 4 6% 33%	2574
	21st to end	Night	15% 9% 4 8% 6% 2 4 4 4 5% 38%	2660
December	1st to 10th	Night	12% 11% 4 8% 8% 4 5% 5% 6% 7% 29%	2660
	11th to 20th	Night	12% 13% 6% 11% 7% 4 5% 4 4 5% 27%	3279
	21st to end	Night	19% 16% 6% 11% 7% 3 4 4 4 5% 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	64% 3 12% 15% 5%	2528
	11th to 20th	Day	60% 4 11% 19% 7%	2530
	21st to end	Day	65% 3 11% 16% 5%	2984
February	1st to 10th	Day	52% 4 13% 19% 11% 1	1710
	11th to 20th	Day	50% 3 12% 23% 10% 2	1721
	21st to end	Day	53% 3 10% 20% 11% 3	1570
March	1st to 10th	Day	41% 3 10% 27% 16% 3	3120
	11th to 20th	Day	41% 4 10% 32% 12% 1	3475
	21st to end	Day	59% 3 10% 17% 9% 1	4032
April	1st to 10th	Day	54% 5% 10% 20% 11% 1	2280
	11th to 20th	Day	53% 4 8% 22% 11% 2	2254
	21st to end	Day	53% 5% 11% 18% 12% 1	2227
May	1st to 10th	Day	51% 6% 14% 22% 7% 1	2512
	11th to 20th	Day	49% 5% 12% 21% 11% 1	2483
	21st to end	Day	45% 6% 10% 22% 14% 2	2725
June	1st to 10th	Day	36% 5% 15% 28% 14% 2	2520
	11th to 20th	Day	40% 6% 13% 24% 17% 1	2520
	21st to end	Day	41% 6% 14% 25% 12% 1	2520
July	1st to 10th	Day	32% 7% 15% 31% 13% 2	2451
	11th to 20th	Day	34% 7% 14% 26% 18% 2	2445
	21st to end	Day	32% 5% 16% 30% 14% 3	2591
August	1st to 10th	Day	35% 7% 16% 29% 11% 2	2407
	11th to 20th	Day	40% 6% 12% 28% 13% 1	2247
	21st to end	Day	36% 6% 12% 26% 18% 2	2376
September	1st to 10th	Day	39% 6% 12% 26% 17% 1	2160
	11th to 20th	Day	37% 5% 14% 32% 12% 1	2150
	21st to end	Day	40% 4 12% 30% 13%	1940
October	1st to 10th	Day	41% 4 12% 31% 12%	1800
	11th to 20th	Day	48% 3 12% 24% 12% 1	1800
	21st to end	Day	50% 4 11% 21% 12% 1	1854
November	1st to 10th	Day	42% 4 13% 23% 16% 2	1672
	11th to 20th	Day	55% 3 12% 20% 9% 1	1601
	21st to end	Day	47% 4 16% 24% 9% 1	1520
December	1st to 10th	Day	55% 5% 13% 19% 8% 1	1520
	11th to 20th	Day	56% 4 16% 15% 8% 2	1915
	21st to end	Day	72% 3 7% 13% 5%	2783
January	1st to 10th	Night	58% 4 8% 22% 7% 1	4428
	11th to 20th	Night	62% 3 10% 16% 9%	4440
	21st to end	Night	65% 3 9% 17% 5% 1	4682
February	1st to 10th	Night	53% 3 11% 21% 11% 2	2470
	11th to 20th	Night	46% 5% 11% 24% 12% 2	2355
	21st to end	Night	50% 3 11% 21% 12% 2	1884
March	1st to 10th	Night	43% 3 10% 28% 11% 4	3733
	11th to 20th	Night	40% 4 8% 29% 17% 3	3513
	21st to end	Night	59% 3 6% 20% 9% 2	3598
April	1st to 10th	Night	51% 3 8% 22% 14% 2	1900
	11th to 20th	Night	47% 3 8% 22% 17% 3	1875
	21st to end	Night	45% 6% 11% 21% 15% 2	1832
May	1st to 10th	Night	48% 5% 12% 20% 14%	1445
	11th to 20th	Night	44% 5% 12% 25% 14% 1	1417
	21st to end	Night	38% 5% 12% 27% 15% 2	1552
June	1st to 10th	Night	33% 6% 12% 30% 16% 1	1440
	11th to 20th	Night	36% 5% 11% 28% 19% 2	1440
	21st to end	Night	31% 6% 15% 29% 15% 4	1440
July	1st to 10th	Night	24% 6% 14% 35% 18% 3	1400
	11th to 20th	Night	28% 5% 15% 29% 20% 3	1392
	21st to end	Night	25% 5% 18% 31% 16% 4	1487
August	1st to 10th	Night	28% 6% 16% 32% 16% 3	1504
	11th to 20th	Night	31% 5% 15% 30% 17% 2	1654
	21st to end	Night	30% 5% 12% 29% 19% 4	1980
September	1st to 10th	Night	33% 6% 11% 29% 21% 1	1800
	11th to 20th	Night	32% 4 12% 34% 16% 1	1800
	21st to end	Night	35% 4 11% 31% 19% 1	2007
October	1st to 10th	Night	36% 4 10% 30% 18% 2	2160
	11th to 20th	Night	43% 4 13% 22% 17% 1	2160
	21st to end	Night	48% 5% 11% 23% 12% 1	2500
November	1st to 10th	Night	43% 4 10% 25% 16% 2	2406
	11th to 20th	Night	53% 4 13% 18% 11% 1	2574
	21st to end	Night	49% 4 13% 25% 8% 1	2660
December	1st to 10th	Night	54% 5% 13% 21% 7% 1	2660
	11th to 20th	Night	60% 4 11% 18% 7% 1	3281
	21st to end	Night	67% 3 8% 15% 6%	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	17% 18% 34% 20% 8% 3	270
	11th to 20th	Day	20% 21% 39% 14% 5% 1	270
	21st to end	Day	21% 15% 38% 21% 5%	297
February	1st to 10th	Day	16% 21% 41% 15% 4 2	270
	11th to 20th	Day	18% 27% 36% 14% 5%	270
	21st to end	Day	20% 22% 42% 14% 1	225
March	1st to 10th	Day	21% 20% 41% 13% 5%	270
	11th to 20th	Day	22% 20% 31% 19% 6% 2	270
	21st to end	Day	28% 15% 31% 17% 8% 1	425
April	1st to 10th	Day	27% 16% 35% 17% 4	460
	11th to 20th	Day	30% 15% 29% 16% 8% 2	452
	21st to end	Day	23% 16% 31% 19% 8% 2	437
May	1st to 10th	Day	20% 16% 32% 25% 5% 2	595
	11th to 20th	Day	20% 15% 30% 23% 10% 3	625
	21st to end	Day	19% 12% 25% 25% 14% 4	679
June	1st to 10th	Day	12% 7% 29% 34% 16% 3	630
	11th to 20th	Day	15% 8% 33% 28% 13% 2	630
	21st to end	Day	15% 8% 29% 29% 13% 4	630
July	1st to 10th	Day	9% 4 22% 30% 25% 10%	621
	11th to 20th	Day	9% 7% 28% 31% 19% 6%	618
	21st to end	Day	6% 5% 28% 36% 17% 7%	684
August	1st to 10th	Day	7% 4 25% 32% 24% 8%	626
	11th to 20th	Day	15% 5% 20% 27% 23% 9%	561
	21st to end	Day	12% 8% 25% 28% 19% 7%	495
September	1st to 10th	Day	18% 8% 23% 29% 17% 5%	450
	11th to 20th	Day	14% 8% 24% 30% 19% 5%	450
	21st to end	Day	20% 13% 28% 24% 14% 2	410
October	1st to 10th	Day	16% 15% 31% 25% 12% 1	270
	11th to 20th	Day	24% 20% 34% 15% 6%	270
	21st to end	Day	26% 21% 31% 16% 4 1	297
November	1st to 10th	Day	18% 16% 39% 20% 6% 1	270
	11th to 20th	Day	23% 18% 39% 17% 4	270
	21st to end	Day	21% 18% 40% 16% 4	270
December	1st to 10th	Day	15% 20% 41% 18% 6% 1	270
	11th to 20th	Day	21% 17% 36% 21% 5%	270
	21st to end	Day	30% 17% 38% 12% 2	297
January	1st to 10th	Night	15% 17% 36% 24% 7% 1	950
	11th to 20th	Night	18% 15% 38% 24% 4 1	950
	21st to end	Night	18% 13% 36% 27% 6%	1045
February	1st to 10th	Night	15% 16% 36% 26% 6% 1	950
	11th to 20th	Night	15% 18% 38% 23% 6%	880
	21st to end	Night	21% 18% 34% 22% 4	628
March	1st to 10th	Night	18% 16% 36% 23% 6% 1	760
	11th to 20th	Night	18% 14% 35% 25% 8% 1	590
	21st to end	Night	24% 8% 30% 29% 7% 2	627
April	1st to 10th	Night	21% 14% 38% 21% 5%	570
	11th to 20th	Night	24% 11% 31% 28% 6%	563
	21st to end	Night	20% 12% 33% 26% 8% 1	555
May	1st to 10th	Night	21% 8% 34% 31% 5%	540
	11th to 20th	Night	18% 8% 30% 34% 10%	531
	21st to end	Night	15% 7% 29% 33% 15% 1	584
June	1st to 10th	Night	12% 7% 27% 42% 12%	540
	11th to 20th	Night	14% 5% 30% 38% 13%	540
	21st to end	Night	10% 5% 26% 42% 17% 1	540
July	1st to 10th	Night	7% 2 18% 38% 31% 3	525
	11th to 20th	Night	8% 5% 21% 43% 21% 3	522
	21st to end	Night	6% 2 18% 49% 22% 3	591
August	1st to 10th	Night	7% 1 16% 47% 26% 2	537
	11th to 20th	Night	10% 3 17% 37% 27% 5%	534
	21st to end	Night	12% 4 19% 40% 23% 3	594
September	1st to 10th	Night	12% 5% 25% 36% 16% 6%	540
	11th to 20th	Night	14% 4 26% 31% 21% 4	540
	21st to end	Night	14% 10% 29% 32% 14% 2	711
October	1st to 10th	Night	15% 9% 29% 27% 18% 2	720
	11th to 20th	Night	20% 12% 32% 27% 8%	720
	21st to end	Night	21% 12% 32% 27% 7% 1	792
November	1st to 10th	Night	18% 10% 37% 26% 9% 1	740
	11th to 20th	Night	17% 17% 40% 20% 6%	864
	21st to end	Night	20% 16% 34% 23% 7%	950
December	1st to 10th	Night	20% 13% 40% 22% 5% 1	950
	11th to 20th	Night	21% 15% 36% 22% 6%	950
	21st to end	Night	26% 16% 33% 21% 5%	1045

Page generated at 2024-04-22 08:25:42. Version ac07

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