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 2024-11-05.

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 5% 7% 37%	101576
	Night	13% 10% 4 8% 5% 4 4 3 5% 6% 38%	97567
Transparency	Day	45% 5% 12% 25% 13% 1	105120
	Night	45% 4 11% 24% 14% 1	102163
Seeing	Day	18% 13% 31% 24% 12% 3	15950
	Night	17% 11% 32% 29% 11% 1	25796

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% 16% 8% 18% 6% 5% 4 3 4 4 24%	2527
	11th to 20th	Day	9% 13% 5% 13% 7% 5% 7% 9% 8% 7% 19%	2530
	21st to end	Day	15% 18% 8% 12% 5% 3 3 2 5% 6% 22%	2984
February	1st to 10th	Day	9% 12% 5% 9% 6% 6% 5% 4 6% 7% 31%	1710
	11th to 20th	Day	11% 11% 4 8% 6% 4 5% 4 6% 6% 35%	1712
	21st to end	Day	12% 11% 5% 10% 6% 5% 4 3 4 7% 33%	1570
March	1st to 10th	Day	14% 9% 3 6% 3 4 3 2 4 6% 46%	3120
	11th to 20th	Day	10% 7% 3 8% 5% 4 4 3 5% 7% 43%	3475
	21st to end	Day	20% 15% 4 9% 4 3 4 3 4 6% 28%	4032
April	1st to 10th	Day	17% 13% 3 8% 5% 5% 4 4 4 6% 31%	2280
	11th to 20th	Day	18% 12% 4 7% 5% 5% 4 3 5% 6% 32%	2254
	21st to end	Day	19% 10% 4 7% 4 5% 5% 4 6% 5% 31%	2299
May	1st to 10th	Day	17% 8% 2 6% 5% 5% 5% 4 6% 7% 37%	4391
	11th to 20th	Day	14% 7% 3 7% 4 4 4 3 6% 8% 41%	4399
	21st to end	Day	17% 7% 3 7% 5% 4 4 5% 6% 7% 37%	4824
June	1st to 10th	Day	12% 5% 2 6% 4 4 4 3 7% 9% 45%	2660
	11th to 20th	Day	13% 6% 3 6% 5% 5% 5% 4 5% 8% 41%	2660
	21st to end	Day	13% 6% 2 6% 6% 4 5% 4 6% 8% 39%	2660
July	1st to 10th	Day	11% 5% 2 7% 5% 6% 6% 6% 7% 9% 36%	4440
	11th to 20th	Day	4 3 1 5% 4 5% 5% 5% 8% 9% 50%	4440
	21st to end	Day	8% 6% 3 7% 5% 5% 5% 4 7% 8% 42%	4813
August	1st to 10th	Day	9% 6% 3 7% 5% 5% 5% 4 6% 8% 41%	4268
	11th to 20th	Day	13% 5% 3 5% 4 4 4 4 5% 7% 46%	3945
	21st to end	Day	10% 6% 2 6% 4 4 5% 4 7% 9% 43%	4180
September	1st to 10th	Day	13% 6% 2 5% 4 4 4 4 5% 8% 44%	2280
	11th to 20th	Day	12% 6% 2 6% 4 4 4 4 5% 8% 45%	2269
	21st to end	Day	13% 6% 3 6% 4 4 4 3 6% 8% 43%	2047
October	1st to 10th	Day	13% 8% 2 6% 3 4 3 3 4 7% 46%	1900
	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	12% 9% 3 8% 4 3 3 4 5% 8% 41%	1708
	11th to 20th	Day	13% 13% 5% 11% 6% 4 4 3 4 7% 30%	1601
	21st to end	Day	13% 10% 4 8% 6% 3 4 2 5% 6% 39%	1520
December	1st to 10th	Day	13% 13% 5% 10% 7% 4 5% 3 5% 6% 30%	1520
	11th to 20th	Day	12% 14% 6% 8% 7% 5% 4 4 5% 8% 28%	1918
	21st to end	Day	18% 21% 9% 12% 5% 4 4 3 3 4 18%	2783
January	1st to 10th	Night	9% 13% 8% 15% 6% 5% 4 3 4 4 29%	4428
	11th to 20th	Night	10% 14% 6% 15% 7% 5% 5% 5% 8% 5% 20%	4440
	21st to end	Night	14% 18% 8% 12% 4 4 5% 3 4 5% 22%	4682
February	1st to 10th	Night	8% 13% 6% 12% 6% 6% 5% 4 5% 5% 32%	2470
	11th to 20th	Night	10% 9% 4 8% 5% 5% 5% 3 5% 5% 40%	2354
	21st to end	Night	14% 12% 3 10% 4 4 4 3 5% 6% 36%	1884
March	1st to 10th	Night	13% 9% 3 7% 4 4 4 3 5% 6% 42%	3733
	11th to 20th	Night	10% 7% 3 7% 4 5% 5% 4 6% 7% 42%	3513
	21st to end	Night	25% 10% 4 11% 4 4 3 2 4 5% 29%	3598
April	1st to 10th	Night	17% 11% 3 8% 4 4 4 3 4 6% 36%	1900
	11th to 20th	Night	19% 9% 2 6% 4 4 4 2 5% 7% 37%	1875
	21st to end	Night	18% 9% 2 6% 4 4 4 3 7% 6% 36%	1880
May	1st to 10th	Night	16% 8% 3 7% 4 5% 4 4 5% 7% 36%	2511
	11th to 20th	Night	10% 7% 2 7% 4 3 4 3 4 7% 47%	2506
	21st to end	Night	11% 8% 3 6% 4 5% 4 4 6% 7% 43%	2743
June	1st to 10th	Night	10% 5% 3 7% 4 3 4 4 7% 9% 46%	1520
	11th to 20th	Night	10% 6% 2 7% 4 4 4 3 5% 8% 46%	1520
	21st to end	Night	9% 6% 2 5% 4 3 4 4 5% 8% 48%	1520
July	1st to 10th	Night	13% 6% 2 5% 4 3 4 4 5% 8% 46%	2530
	11th to 20th	Night	4 3 1 4 4 4 5% 3 6% 9% 57%	2530
	21st to end	Night	6% 5% 2 6% 4 5% 5% 5% 6% 8% 47%	2750
August	1st to 10th	Night	10% 5% 2 5% 4 4 5% 3 6% 7% 49%	2668
	11th to 20th	Night	11% 6% 2 5% 4 3 3 3 5% 7% 51%	2891
	21st to end	Night	10% 6% 2 5% 4 3 4 3 5% 7% 49%	3476
September	1st to 10th	Night	9% 6% 2 5% 3 4 3 4 4 7% 53%	1900
	11th to 20th	Night	12% 5% 2 4 3 4 3 3 5% 6% 53%	1900
	21st to end	Night	12% 6% 2 5% 4 4 4 3 4 6% 52%	2119
October	1st to 10th	Night	13% 6% 2 5% 3 3 3 4 5% 6% 51%	2280
	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%	2470
	11th to 20th	Night	12% 11% 4 10% 7% 4 4 3 5% 6% 33%	2574
	21st to end	Night	15% 10% 4 9% 5% 3 4 3 4 6% 37%	2660
December	1st to 10th	Night	12% 12% 4 10% 7% 5% 5% 4 6% 7% 28%	2660
	11th to 20th	Night	12% 14% 5% 13% 6% 6% 4 3 4 5% 26%	3279
	21st to end	Night	19% 17% 6% 13% 5% 5% 4 3 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	2299
May	1st to 10th	Day	46% 5% 9% 24% 16% 1	4432
	11th to 20th	Day	42% 4 9% 34% 11% 1	4403
	21st to end	Day	46% 5% 9% 24% 15% 2	4837
June	1st to 10th	Day	37% 5% 14% 28% 15% 2	2660
	11th to 20th	Day	40% 5% 13% 23% 17% 1	2660
	21st to end	Day	41% 6% 14% 25% 12% 2	2660
July	1st to 10th	Day	41% 8% 16% 26% 7% 1	4371
	11th to 20th	Day	27% 8% 15% 32% 18% 1	4365
	21st to end	Day	37% 7% 13% 24% 18% 2	4662
August	1st to 10th	Day	38% 6% 15% 27% 13% 1	4253
	11th to 20th	Day	36% 5% 12% 33% 13%	3984
	21st to end	Day	36% 6% 14% 30% 13% 1	4179
September	1st to 10th	Day	38% 5% 12% 26% 18% 1	2280
	11th to 20th	Day	37% 5% 13% 32% 13% 1	2269
	21st to end	Day	39% 4 12% 31% 14% 1	2047
October	1st to 10th	Day	24% 3 7% 42% 23% 1	3160
	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	42% 4 14% 23% 15% 2	1708
	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	46% 5% 11% 21% 15% 2	1880
May	1st to 10th	Night	47% 5% 11% 19% 18%	2535
	11th to 20th	Night	38% 4 10% 27% 20% 2	2507
	21st to end	Night	40% 5% 10% 26% 18% 1	2751
June	1st to 10th	Night	34% 6% 12% 30% 17% 2	1520
	11th to 20th	Night	36% 5% 11% 27% 19% 2	1520
	21st to end	Night	33% 6% 14% 28% 16% 4	1520
July	1st to 10th	Night	37% 5% 17% 26% 13% 3	2490
	11th to 20th	Night	24% 5% 16% 36% 18% 2	2482
	21st to end	Night	31% 7% 16% 24% 19% 3	2662
August	1st to 10th	Night	33% 5% 13% 29% 18% 2	2659
	11th to 20th	Night	32% 5% 14% 32% 16% 1	2918
	21st to end	Night	33% 6% 14% 26% 18% 2	3476
September	1st to 10th	Night	31% 5% 11% 30% 22% 1	1900
	11th to 20th	Night	33% 4 12% 34% 16% 1	1900
	21st to end	Night	34% 4 11% 31% 20% 1	2119
October	1st to 10th	Night	26% 3 7% 36% 28% 2	3800
	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% 16% 2	2470
	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	25% 15% 32% 19% 8% 2	460
May	1st to 10th	Day	20% 16% 31% 25% 6% 2	645
	11th to 20th	Day	20% 14% 30% 24% 10% 3	675
	21st to end	Day	20% 12% 26% 25% 13% 4	734
June	1st to 10th	Day	12% 8% 30% 32% 15% 3	680
	11th to 20th	Day	16% 9% 34% 27% 13% 2	680
	21st to end	Day	17% 9% 29% 28% 13% 4	680
July	1st to 10th	Day	10% 4 23% 30% 25% 9%	671
	11th to 20th	Day	8% 7% 28% 30% 20% 7%	668
	21st to end	Day	7% 6% 28% 35% 17% 7%	739
August	1st to 10th	Day	8% 5% 25% 31% 23% 8%	676
	11th to 20th	Day	15% 6% 22% 26% 22% 8%	608
	21st to end	Day	12% 8% 25% 28% 20% 7%	539
September	1st to 10th	Day	17% 8% 24% 29% 17% 5%	490
	11th to 20th	Day	14% 7% 24% 31% 19% 5%	490
	21st to end	Day	19% 13% 28% 25% 13% 2	447
October	1st to 10th	Day	15% 15% 32% 25% 11% 1	300
	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% 20% 6% 1	282
	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	21% 11% 32% 26% 8% 1	570
May	1st to 10th	Night	21% 8% 34% 31% 5%	570
	11th to 20th	Night	17% 8% 30% 34% 10%	561
	21st to end	Night	15% 7% 29% 33% 15% 1	617
June	1st to 10th	Night	11% 8% 28% 42% 11%	570
	11th to 20th	Night	14% 5% 31% 37% 13%	570
	21st to end	Night	11% 5% 26% 41% 16% 1	570
July	1st to 10th	Night	8% 3 18% 39% 30% 3	555
	11th to 20th	Night	7% 5% 21% 43% 22% 3	552
	21st to end	Night	6% 2 18% 49% 22% 3	624
August	1st to 10th	Night	8% 1 17% 46% 25% 2	567
	11th to 20th	Night	10% 3 18% 37% 27% 5%	564
	21st to end	Night	12% 4 18% 40% 23% 3	627
September	1st to 10th	Night	11% 5% 25% 36% 17% 5%	570
	11th to 20th	Night	13% 4 26% 32% 21% 4	570
	21st to end	Night	14% 10% 28% 32% 14% 2	751
October	1st to 10th	Night	15% 9% 29% 28% 17% 1	760
	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	760
	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 2024-11-03 01:11:23. Version ac07

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