Kings Mountain State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Kings Mountain State Park clear sky chart from 2005-11-06 to 2025-12-18.

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% 6% 2 6% 4 4 4 4 6% 8% 43%	127181
	Night	14% 6% 2 6% 4 4 4 3 5% 7% 44%	123861
Transparency	Day	38% 6% 12% 20% 18% 6%	130853
	Night	38% 6% 10% 19% 21% 7%	128258
Seeing	Day	17% 9% 23% 24% 18% 9%	16723
	Night	17% 8% 22% 31% 20% 3	26796

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	15% 5% 2 5% 3 2 2 2 3 5% 56%	4056
	11th to 20th	Day	13% 6% 2 4 3 3 3 2 3 3 59%	4060
	21st to end	Day	19% 7% 2 6% 4 4 3 3 4 4 45%	4466
February	1st to 10th	Day	15% 7% 2 5% 4 3 4 4 7% 6% 43%	1806
	11th to 20th	Day	22% 7% 2 4 3 3 3 3 4 5% 44%	1948
	21st to end	Day	19% 8% 2 6% 4 3 3 3 5% 5% 42%	1676
March	1st to 10th	Day	20% 7% 2 6% 4 4 3 3 4 5% 41%	4935
	11th to 20th	Day	10% 5% 2 6% 3 3 3 3 4 7% 54%	4980
	21st to end	Day	18% 6% 2 5% 3 3 3 3 4 5% 47%	5465
April	1st to 10th	Day	12% 4 2 4 4 4 4 4 5% 7% 49%	2200
	11th to 20th	Day	13% 5% 2 5% 3 4 4 4 5% 6% 49%	2344
	21st to end	Day	12% 5% 2 5% 4 4 5% 3 5% 7% 47%	2590
May	1st to 10th	Day	10% 7% 3 7% 5% 4 6% 4 8% 10% 35%	5862
	11th to 20th	Day	19% 7% 3 7% 4 5% 5% 5% 7% 8% 31%	5861
	21st to end	Day	12% 6% 2 6% 4 4 4 3 7% 8% 42%	6433
June	1st to 10th	Day	9% 6% 2 6% 5% 5% 5% 5% 8% 11% 38%	2600
	11th to 20th	Day	8% 5% 2 5% 4 5% 6% 5% 8% 10% 43%	2600
	21st to end	Day	7% 5% 2 5% 5% 5% 5% 5% 9% 12% 41%	2600
July	1st to 10th	Day	9% 6% 2 6% 5% 6% 6% 5% 8% 10% 38%	5900
	11th to 20th	Day	6% 5% 2 6% 5% 6% 7% 5% 9% 13% 35%	5900
	21st to end	Day	9% 7% 3 8% 6% 6% 6% 6% 8% 11% 30%	6424
August	1st to 10th	Day	18% 8% 3 7% 5% 5% 5% 5% 8% 9% 26%	4234
	11th to 20th	Day	9% 6% 2 7% 5% 5% 6% 4 7% 11% 36%	4174
	21st to end	Day	6% 3 1 5% 4 4 5% 4 6% 9% 53%	4387
September	1st to 10th	Day	9% 5% 2 5% 5% 5% 5% 5% 7% 9% 42%	2200
	11th to 20th	Day	12% 7% 2 6% 5% 4 5% 4 6% 8% 42%	2200
	21st to end	Day	16% 8% 2 7% 5% 4 4 4 5% 6% 40%	2200
October	1st to 10th	Day	13% 5% 2 5% 2 3 3 3 4 6% 55%	2100
	11th to 20th	Day	13% 5% 1 3 3 3 3 2 3 5% 59%	2000
	21st to end	Day	15% 5% 1 4 3 2 3 3 3 4 58%	2200
November	1st to 10th	Day	13% 6% 2 5% 3 2 3 2 4 5% 55%	2057
	11th to 20th	Day	14% 4 2 4 3 3 4 3 4 7% 53%	1911
	21st to end	Day	15% 6% 1 5% 4 3 3 2 4 5% 50%	1890
December	1st to 10th	Day	16% 7% 2 4 2 3 3 2 4 5% 52%	3020
	11th to 20th	Day	19% 8% 3 6% 4 3 3 3 4 6% 41%	3436
	21st to end	Day	22% 6% 2 4 2 3 3 3 4 5% 46%	4466
January	1st to 10th	Night	14% 5% 2 4 3 3 3 2 3 4 59%	5889
	11th to 20th	Night	12% 6% 2 4 3 3 3 2 4 5% 56%	5900
	21st to end	Night	19% 7% 2 4 3 3 3 3 4 5% 48%	6490
February	1st to 10th	Night	15% 6% 2 6% 4 3 4 3 4 6% 46%	2590
	11th to 20th	Night	21% 7% 2 5% 4 3 3 3 4 4 43%	2338
	21st to end	Night	16% 6% 2 5% 4 4 4 3 4 7% 45%	1952
March	1st to 10th	Night	19% 6% 2 6% 3 3 3 3 3 6% 44%	4918
	11th to 20th	Night	10% 4 1 4 3 3 4 3 6% 7% 55%	4980
	21st to end	Night	16% 5% 2 5% 4 3 3 3 5% 6% 48%	5467
April	1st to 10th	Night	13% 5% 2 5% 4 3 4 3 5% 7% 48%	2200
	11th to 20th	Night	12% 6% 1 5% 4 3 3 4 4 7% 52%	2005
	21st to end	Night	12% 4 2 5% 4 4 5% 3 6% 7% 47%	1826
May	1st to 10th	Night	14% 7% 2 7% 4 5% 5% 4 6% 8% 39%	4033
	11th to 20th	Night	20% 8% 3 6% 4 4 5% 4 6% 9% 31%	4032
	21st to end	Night	14% 6% 2 6% 4 5% 4 4 7% 9% 40%	4421
June	1st to 10th	Night	11% 6% 2 6% 5% 5% 7% 6% 8% 11% 34%	1800
	11th to 20th	Night	9% 6% 2 6% 6% 6% 6% 5% 7% 10% 37%	1800
	21st to end	Night	7% 6% 2 6% 6% 6% 6% 6% 8% 11% 37%	1800
July	1st to 10th	Night	10% 7% 3 9% 6% 6% 6% 5% 7% 10% 29%	4058
	11th to 20th	Night	8% 6% 3 7% 6% 5% 7% 7% 11% 13% 27%	4057
	21st to end	Night	11% 9% 4 10% 7% 6% 7% 5% 8% 9% 23%	4427
August	1st to 10th	Night	19% 11% 3 9% 5% 5% 4 5% 6% 9% 24%	2915
	11th to 20th	Night	11% 7% 3 9% 5% 7% 7% 5% 7% 10% 29%	2875
	21st to end	Night	6% 4 2 6% 5% 5% 6% 4 8% 10% 46%	3470
September	1st to 10th	Night	10% 5% 2 6% 5% 4 5% 5% 6% 9% 44%	2200
	11th to 20th	Night	14% 7% 3 7% 5% 5% 5% 4 6% 8% 37%	2200
	21st to end	Night	17% 7% 2 6% 4 5% 4 3 5% 8% 40%	2200
October	1st to 10th	Night	14% 5% 2 6% 4 3 3 2 4 6% 51%	2299
	11th to 20th	Night	13% 5% 2 5% 3 2 2 4 5% 5% 53%	2400
	21st to end	Night	14% 4 2 4 3 2 3 2 4 5% 58%	2640
November	1st to 10th	Night	14% 5% 2 5% 3 3 2 2 4 5% 54%	2461
	11th to 20th	Night	14% 5% 2 5% 3 3 3 3 5% 6% 53%	2704
	21st to end	Night	14% 5% 2 5% 3 4 4 3 5% 6% 49%	2730
December	1st to 10th	Night	17% 6% 2 4 3 2 3 3 4 5% 52%	4380
	11th to 20th	Night	20% 8% 2 6% 3 3 3 3 4 5% 44%	4914
	21st to end	Night	21% 4 2 4 3 3 4 3 4 6% 46%	6490

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	33% 2 5% 20% 31% 8%	4057
	11th to 20th	Day	32% 3 4 14% 36% 10%	4060
	21st to end	Day	43% 3 4 17% 23% 10%	4466
February	1st to 10th	Day	40% 5% 10% 21% 19% 5%	1806
	11th to 20th	Day	43% 4 8% 17% 22% 6%	1958
	21st to end	Day	45% 5% 7% 15% 21% 7%	1676
March	1st to 10th	Day	45% 4 6% 14% 19% 12%	4935
	11th to 20th	Day	32% 4 6% 14% 25% 19%	4980
	21st to end	Day	41% 4 5% 23% 22% 5%	5465
April	1st to 10th	Day	33% 6% 9% 21% 25% 6%	2200
	11th to 20th	Day	35% 5% 9% 21% 22% 9%	2344
	21st to end	Day	36% 6% 11% 24% 19% 4	2590
May	1st to 10th	Day	41% 8% 18% 20% 11% 1	5897
	11th to 20th	Day	49% 7% 14% 19% 11% 1	5865
	21st to end	Day	38% 7% 13% 22% 18% 3	6447
June	1st to 10th	Day	37% 9% 15% 26% 11% 1	2600
	11th to 20th	Day	33% 10% 19% 23% 14% 1	2600
	21st to end	Day	32% 10% 19% 23% 15% 2	2600
July	1st to 10th	Day	39% 9% 17% 25% 10% 1	5835
	11th to 20th	Day	36% 11% 32% 17% 4	5831
	21st to end	Day	45% 10% 16% 22% 6% 1	6240
August	1st to 10th	Day	51% 7% 18% 18% 5%	4221
	11th to 20th	Day	40% 9% 19% 19% 12% 1	4213
	21st to end	Day	27% 7% 15% 32% 16% 3	4387
September	1st to 10th	Day	35% 9% 15% 19% 18% 4	2200
	11th to 20th	Day	38% 8% 14% 18% 20% 3	2200
	21st to end	Day	44% 6% 10% 19% 15% 5%	2200
October	1st to 10th	Day	29% 3 6% 21% 30% 10%	3425
	11th to 20th	Day	20% 2 5% 18% 29% 25%	3240
	21st to end	Day	27% 2 4 25% 25% 16%	3538
November	1st to 10th	Day	33% 4 7% 19% 28% 9%	2057
	11th to 20th	Day	32% 4 7% 22% 26% 8%	1911
	21st to end	Day	36% 4 7% 22% 24% 7%	1890
December	1st to 10th	Day	37% 3 6% 19% 26% 10%	3020
	11th to 20th	Day	45% 3 7% 17% 20% 7%	3433
	21st to end	Day	41% 3 8% 27% 19% 2	4466
January	1st to 10th	Night	31% 3 5% 17% 36% 8%	5889
	11th to 20th	Night	32% 4 5% 15% 36% 8%	5900
	21st to end	Night	41% 2 4 18% 27% 9%	6490
February	1st to 10th	Night	40% 4 9% 20% 21% 6%	2590
	11th to 20th	Night	45% 4 7% 16% 22% 7%	2339
	21st to end	Night	40% 5% 9% 16% 23% 7%	1952
March	1st to 10th	Night	41% 4 7% 13% 26% 8%	4918
	11th to 20th	Night	28% 4 7% 15% 28% 18%	4980
	21st to end	Night	38% 4 6% 22% 22% 8%	5467
April	1st to 10th	Night	35% 5% 10% 19% 24% 6%	2200
	11th to 20th	Night	32% 5% 9% 23% 22% 9%	2005
	21st to end	Night	34% 6% 11% 24% 21% 4	1826
May	1st to 10th	Night	41% 7% 14% 21% 15% 1	4060
	11th to 20th	Night	49% 7% 14% 19% 11% 1	4033
	21st to end	Night	38% 7% 13% 25% 15% 2	4429
June	1st to 10th	Night	40% 11% 15% 21% 11% 2	1800
	11th to 20th	Night	39% 11% 17% 22% 10% 2	1800
	21st to end	Night	38% 12% 16% 17% 13% 4	1800
July	1st to 10th	Night	48% 9% 17% 17% 8% 1	4015
	11th to 20th	Night	43% 13% 26% 15% 2 1	4006
	21st to end	Night	55% 9% 15% 16% 5%	4297
August	1st to 10th	Night	56% 7% 18% 15% 4	2904
	11th to 20th	Night	47% 9% 21% 15% 8%	2902
	21st to end	Night	31% 8% 13% 27% 20% 2	3470
September	1st to 10th	Night	34% 10% 15% 19% 17% 5%	2200
	11th to 20th	Night	43% 7% 14% 15% 19% 2	2200
	21st to end	Night	43% 7% 13% 16% 17% 4	2200
October	1st to 10th	Night	35% 4 7% 20% 26% 7%	3754
	11th to 20th	Night	23% 3 5% 19% 25% 24%	3899
	21st to end	Night	29% 2 5% 21% 27% 17%	4252
November	1st to 10th	Night	34% 4 7% 18% 26% 11%	2461
	11th to 20th	Night	33% 4 7% 18% 26% 12%	2704
	21st to end	Night	35% 4 6% 21% 27% 7%	2730
December	1st to 10th	Night	36% 3 6% 19% 27% 9%	4380
	11th to 20th	Night	44% 4 10% 15% 18% 9%	4916
	21st to end	Night	40% 3 10% 23% 21% 2	6490

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	23% 20% 34% 20% 3	300
	11th to 20th	Day	27% 19% 31% 19% 4	300
	21st to end	Day	24% 18% 35% 17% 5%	330
February	1st to 10th	Day	21% 21% 36% 16% 5% 1	300
	11th to 20th	Day	38% 17% 34% 9% 2	300
	21st to end	Day	28% 19% 35% 13% 4	275
March	1st to 10th	Day	25% 15% 29% 23% 6% 2	500
	11th to 20th	Day	22% 15% 36% 20% 6% 1	500
	21st to end	Day	23% 15% 37% 19% 5% 1	550
April	1st to 10th	Day	21% 14% 31% 22% 12% 1	500
	11th to 20th	Day	15% 14% 32% 23% 13% 2	492
	21st to end	Day	16% 9% 27% 28% 15% 5%	500
May	1st to 10th	Day	10% 14% 33% 23% 15% 5%	503
	11th to 20th	Day	18% 7% 20% 26% 21% 9%	527
	21st to end	Day	15% 6% 19% 22% 25% 13%	573
June	1st to 10th	Day	12% 5% 16% 32% 23% 13%	530
	11th to 20th	Day	8% 4 16% 28% 26% 18%	530
	21st to end	Day	9% 3 13% 28% 33% 14%	530
July	1st to 10th	Day	11% 1 8% 24% 33% 23%	525
	11th to 20th	Day	8% 2 7% 28% 31% 24%	524
	21st to end	Day	7% 2 9% 30% 33% 18%	576
August	1st to 10th	Day	18% 3 11% 26% 25% 17%	526
	11th to 20th	Day	12% 3 9% 28% 30% 19%	519
	21st to end	Day	12% 2 10% 25% 30% 21%	583
September	1st to 10th	Day	11% 3 13% 26% 29% 18%	530
	11th to 20th	Day	16% 3 12% 22% 28% 18%	530
	21st to end	Day	20% 4 22% 25% 22% 7%	530
October	1st to 10th	Day	16% 4 19% 29% 22% 9%	530
	11th to 20th	Day	14% 6% 22% 31% 22% 5%	530
	21st to end	Day	19% 8% 21% 29% 17% 5%	583
November	1st to 10th	Day	20% 9% 25% 28% 15% 4	535
	11th to 20th	Day	18% 12% 35% 24% 9% 2	351
	21st to end	Day	15% 12% 33% 28% 11% 2	330
December	1st to 10th	Day	28% 11% 38% 18% 6%	330
	11th to 20th	Day	24% 11% 34% 21% 8% 1	321
	21st to end	Day	28% 14% 31% 19% 7% 2	330
January	1st to 10th	Night	21% 14% 32% 27% 6%	800
	11th to 20th	Night	20% 13% 31% 31% 5%	800
	21st to end	Night	20% 13% 35% 30% 3	880
February	1st to 10th	Night	19% 12% 34% 32% 4	800
	11th to 20th	Night	26% 12% 38% 23% 2	783
	21st to end	Night	21% 14% 35% 27% 3	660
March	1st to 10th	Night	19% 14% 30% 32% 6%	800
	11th to 20th	Night	18% 13% 34% 26% 7% 1	800
	21st to end	Night	18% 12% 34% 29% 7%	880
April	1st to 10th	Night	18% 12% 32% 28% 9%	800
	11th to 20th	Night	15% 12% 29% 28% 16% 1	791
	21st to end	Night	13% 7% 24% 39% 16%	626
May	1st to 10th	Night	12% 8% 28% 35% 17% 1	600
	11th to 20th	Night	15% 6% 20% 34% 24% 2	591
	21st to end	Night	16% 3 11% 32% 35% 4	650
June	1st to 10th	Night	12% 4 12% 38% 31% 4	600
	11th to 20th	Night	11% 4 14% 28% 34% 8%	600
	21st to end	Night	10% 2 11% 32% 40% 7%	600
July	1st to 10th	Night	12% 1 7% 28% 42% 9%	585
	11th to 20th	Night	11% 2 7% 23% 45% 13%	582
	21st to end	Night	9% 2 8% 28% 45% 7%	657
August	1st to 10th	Night	17% 1 6% 28% 40% 8%	597
	11th to 20th	Night	13% 3 7% 30% 38% 9%	594
	21st to end	Night	12% 2 9% 25% 43% 8%	791
September	1st to 10th	Night	11% 2 10% 31% 38% 9%	800
	11th to 20th	Night	16% 4 13% 25% 35% 7%	800
	21st to end	Night	20% 3 15% 32% 28% 3	800
October	1st to 10th	Night	16% 5% 17% 30% 27% 6%	800
	11th to 20th	Night	16% 5% 23% 33% 21% 3	800
	21st to end	Night	16% 7% 23% 33% 19% 3	880
November	1st to 10th	Night	16% 7% 23% 34% 18% 3	820
	11th to 20th	Night	15% 10% 29% 34% 11% 1	840
	21st to end	Night	16% 9% 29% 35% 11% 1	840
December	1st to 10th	Night	24% 10% 26% 33% 7%	840
	11th to 20th	Night	21% 8% 25% 37% 9% 1	829
	21st to end	Night	26% 11% 23% 31% 9%	880

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