Mt. Pisgah State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Mt. Pisgah State Park clear sky chart from 2005-11-06 to 2026-01-17.

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	14% 10% 4 9% 5% 5% 5% 4 6% 7% 32%	127667
	Night	14% 10% 4 9% 5% 5% 5% 4 5% 6% 32%	123983
Transparency	Day	49% 7% 12% 20% 11% 1	131223
	Night	49% 7% 12% 20% 11% 1	128512
Seeing	Day	23% 17% 28% 19% 10% 3	16186
	Night	21% 16% 28% 25% 9% 1	25578

By Month

Percentage Cloud Cover NE (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	12% 14% 7% 18% 7% 5% 4 3 5% 5% 21%	3677
	11th to 20th	Day	11% 14% 7% 19% 7% 7% 6% 4 4 5% 17%	3756
	21st to end	Day	14% 13% 7% 11% 6% 5% 5% 4 5% 5% 26%	4466
February	1st to 10th	Day	13% 15% 4 12% 7% 6% 5% 3 5% 4 25%	1800
	11th to 20th	Day	13% 12% 5% 13% 6% 5% 6% 3 5% 6% 26%	1782
	21st to end	Day	17% 13% 3 12% 6% 4 3 3 5% 6% 28%	1650
March	1st to 10th	Day	18% 12% 5% 10% 5% 5% 4 2 3 4 32%	4678
	11th to 20th	Day	10% 13% 4 9% 5% 4 4 3 4 6% 39%	4980
	21st to end	Day	12% 10% 4 10% 6% 6% 6% 4 5% 6% 31%	5646
April	1st to 10th	Day	15% 13% 4 9% 6% 4 4 3 4 6% 31%	2400
	11th to 20th	Day	15% 12% 3 7% 6% 4 5% 3 6% 6% 33%	2374
	21st to end	Day	16% 9% 3 7% 5% 3 4 4 6% 6% 36%	2420
May	1st to 10th	Day	26% 10% 3 7% 5% 5% 4 3 5% 6% 27%	6108
	11th to 20th	Day	19% 10% 3 8% 6% 5% 5% 4 6% 7% 28%	6318
	21st to end	Day	18% 8% 2 7% 5% 5% 5% 4 6% 8% 31%	6949
June	1st to 10th	Day	15% 6% 2 7% 6% 5% 5% 4 6% 8% 34%	2800
	11th to 20th	Day	13% 7% 3 7% 5% 5% 5% 4 7% 8% 35%	2800
	21st to end	Day	11% 6% 3 7% 5% 6% 5% 5% 7% 9% 37%	2800
July	1st to 10th	Day	6% 6% 3 8% 6% 6% 6% 5% 8% 10% 38%	6360
	11th to 20th	Day	5% 5% 3 9% 6% 8% 7% 5% 9% 12% 33%	6360
	21st to end	Day	10% 6% 3 7% 6% 5% 6% 4 7% 8% 40%	6750
August	1st to 10th	Day	18% 7% 3 7% 5% 5% 5% 5% 6% 7% 31%	4234
	11th to 20th	Day	13% 8% 3 7% 5% 5% 6% 5% 7% 9% 32%	4055
	21st to end	Day	11% 9% 2 7% 4 3 5% 4 6% 9% 40%	4312
September	1st to 10th	Day	14% 7% 2 6% 5% 4 5% 4 5% 8% 42%	2400
	11th to 20th	Day	11% 7% 2 6% 4 5% 4 3 5% 7% 45%	2400
	21st to end	Day	18% 7% 3 7% 5% 5% 4 4 6% 7% 34%	2117
October	1st to 10th	Day	15% 7% 3 7% 4 4 5% 4 6% 7% 38%	2000
	11th to 20th	Day	16% 9% 3 8% 5% 5% 4 4 5% 7% 35%	2000
	21st to end	Day	17% 11% 3 8% 5% 5% 5% 4 6% 6% 30%	2170
November	1st to 10th	Day	13% 10% 4 8% 4 4 4 4 4 6% 39%	1851
	11th to 20th	Day	12% 12% 4 8% 7% 5% 5% 4 6% 6% 31%	1780
	21st to end	Day	15% 13% 4 8% 6% 5% 5% 3 6% 6% 28%	1680
December	1st to 10th	Day	13% 14% 6% 12% 7% 6% 5% 5% 6% 6% 20%	2680
	11th to 20th	Day	18% 14% 5% 9% 5% 3 4 4 4 4 30%	3066
	21st to end	Day	16% 16% 5% 15% 6% 5% 4 4 5% 6% 18%	4048
January	1st to 10th	Night	11% 11% 6% 16% 7% 5% 5% 4 5% 6% 23%	6489
	11th to 20th	Night	9% 11% 6% 15% 7% 6% 5% 5% 6% 7% 22%	6245
	21st to end	Night	15% 12% 5% 13% 7% 6% 6% 3 5% 5% 23%	6490
February	1st to 10th	Night	14% 10% 5% 9% 7% 6% 5% 5% 6% 6% 27%	2600
	11th to 20th	Night	13% 11% 4 11% 7% 6% 6% 5% 5% 6% 26%	2503
	21st to end	Night	15% 12% 4 12% 6% 4 5% 5% 6% 5% 26%	1980
March	1st to 10th	Night	14% 11% 6% 11% 7% 5% 4 3 4 5% 30%	5144
	11th to 20th	Night	10% 12% 4 8% 5% 4 4 3 5% 6% 37%	4979
	21st to end	Night	13% 11% 4 10% 5% 5% 5% 4 5% 5% 35%	5285
April	1st to 10th	Night	15% 13% 4 9% 6% 4 5% 4 5% 6% 30%	2000
	11th to 20th	Night	17% 9% 4 7% 4 4 4 3 7% 7% 34%	1975
	21st to end	Night	16% 9% 3 6% 6% 4 3 3 6% 6% 38%	1995
May	1st to 10th	Night	29% 9% 3 7% 4 3 4 3 5% 6% 27%	3833
	11th to 20th	Night	21% 8% 3 6% 4 4 4 4 6% 6% 34%	3575
	21st to end	Night	16% 7% 3 7% 5% 5% 5% 4 7% 8% 33%	3926
June	1st to 10th	Night	14% 7% 3 7% 5% 4 5% 3 6% 8% 40%	1600
	11th to 20th	Night	12% 6% 3 8% 5% 4 5% 4 7% 8% 39%	1600
	21st to end	Night	9% 6% 3 6% 5% 4 5% 5% 6% 8% 45%	1600
July	1st to 10th	Night	8% 6% 3 8% 6% 4 5% 4 6% 9% 40%	3600
	11th to 20th	Night	8% 5% 2 7% 5% 5% 6% 5% 8% 11% 37%	3600
	21st to end	Night	8% 6% 2 6% 5% 5% 4 4 5% 7% 48%	4098
August	1st to 10th	Night	16% 6% 3 6% 5% 4 6% 4 6% 7% 37%	2915
	11th to 20th	Night	13% 9% 3 7% 4 4 4 4 6% 6% 42%	2959
	21st to end	Night	10% 8% 3 5% 4 5% 5% 4 6% 8% 42%	3586
September	1st to 10th	Night	12% 6% 2 6% 4 5% 4 4 5% 6% 45%	2000
	11th to 20th	Night	11% 5% 1 6% 3 4 3 3 5% 8% 50%	2000
	21st to end	Night	17% 7% 3 6% 4 4 4 3 6% 7% 38%	2277
October	1st to 10th	Night	15% 7% 2 7% 3 4 4 4 5% 7% 42%	2400
	11th to 20th	Night	16% 9% 2 6% 4 4 4 3 5% 6% 40%	2400
	21st to end	Night	19% 10% 3 8% 5% 4 3 4 5% 7% 33%	2668
November	1st to 10th	Night	9% 11% 3 8% 4 5% 4 3 5% 7% 42%	2667
	11th to 20th	Night	15% 10% 3 8% 5% 5% 5% 4 6% 6% 32%	2836
	21st to end	Night	13% 11% 3 10% 6% 6% 6% 4 6% 6% 29%	2940
December	1st to 10th	Night	11% 10% 6% 12% 7% 7% 6% 5% 7% 7% 23%	4720
	11th to 20th	Night	18% 13% 4 10% 5% 4 4 3 5% 5% 29%	5348
	21st to end	Night	17% 17% 6% 11% 6% 5% 4 3 5% 5% 21%	7150

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	63% 5% 10% 16% 4 1	3678
	11th to 20th	Day	67% 7% 8% 11% 6% 1	3786
	21st to end	Day	59% 6% 9% 17% 8% 1	4466
February	1st to 10th	Day	62% 5% 10% 13% 8% 1	1800
	11th to 20th	Day	58% 7% 7% 19% 8%	1791
	21st to end	Day	58% 5% 9% 19% 8% 2	1650
March	1st to 10th	Day	56% 4 9% 19% 10% 3	4681
	11th to 20th	Day	46% 5% 17% 20% 8% 3	4980
	21st to end	Day	51% 7% 9% 15% 15% 3	5646
April	1st to 10th	Day	55% 4 8% 20% 10% 2	2400
	11th to 20th	Day	51% 6% 10% 18% 14% 1	2374
	21st to end	Day	47% 5% 10% 20% 14% 3	2420
May	1st to 10th	Day	57% 6% 10% 16% 10% 1	6117
	11th to 20th	Day	54% 8% 9% 19% 9% 1	6322
	21st to end	Day	48% 7% 12% 21% 11% 1	6949
June	1st to 10th	Day	45% 8% 12% 21% 14% 1	2800
	11th to 20th	Day	45% 7% 15% 21% 11% 1	2800
	21st to end	Day	41% 10% 14% 23% 12% 1	2800
July	1st to 10th	Day	38% 8% 15% 26% 12% 1	6290
	11th to 20th	Day	39% 9% 18% 22% 11%	6285
	21st to end	Day	39% 8% 12% 23% 17% 1	6555
August	1st to 10th	Day	49% 8% 14% 18% 11% 1	4221
	11th to 20th	Day	44% 8% 15% 25% 7%	4094
	21st to end	Day	39% 6% 13% 31% 9% 1	4312
September	1st to 10th	Day	41% 5% 12% 27% 13% 2	2400
	11th to 20th	Day	37% 6% 11% 25% 19% 2	2400
	21st to end	Day	49% 5% 13% 19% 13% 2	2117
October	1st to 10th	Day	40% 7% 11% 22% 19% 1	3260
	11th to 20th	Day	43% 5% 10% 23% 18% 2	3240
	21st to end	Day	37% 6% 15% 27% 14% 1	3484
November	1st to 10th	Day	45% 6% 12% 21% 13% 2	1851
	11th to 20th	Day	52% 5% 12% 20% 9% 2	1780
	21st to end	Day	54% 7% 13% 19% 6% 1	1680
December	1st to 10th	Day	60% 8% 10% 17% 4	2680
	11th to 20th	Day	58% 5% 12% 15% 9%	3066
	21st to end	Day	64% 8% 10% 12% 5%	4048
January	1st to 10th	Night	59% 7% 10% 15% 9% 1	6489
	11th to 20th	Night	57% 7% 14% 15% 6% 1	6289
	21st to end	Night	61% 7% 8% 11% 12% 1	6490
February	1st to 10th	Night	55% 7% 12% 18% 7% 1	2600
	11th to 20th	Night	57% 7% 10% 16% 8% 1	2505
	21st to end	Night	56% 6% 10% 16% 10% 2	1980
March	1st to 10th	Night	56% 5% 12% 15% 10% 2	5154
	11th to 20th	Night	47% 6% 17% 20% 6% 4	4980
	21st to end	Night	49% 6% 9% 19% 16% 2	5285
April	1st to 10th	Night	55% 6% 9% 17% 10% 2	2000
	11th to 20th	Night	48% 6% 13% 18% 14% 1	1975
	21st to end	Night	45% 6% 12% 20% 14% 3	1995
May	1st to 10th	Night	59% 5% 9% 18% 7% 2	3840
	11th to 20th	Night	49% 10% 13% 16% 11% 1	3576
	21st to end	Night	45% 10% 13% 19% 12% 1	3927
June	1st to 10th	Night	42% 6% 11% 25% 15% 1	1600
	11th to 20th	Night	41% 8% 15% 24% 11% 2	1600
	21st to end	Night	36% 9% 14% 27% 14% 1	1600
July	1st to 10th	Night	39% 7% 15% 25% 13% 1	3560
	11th to 20th	Night	37% 10% 18% 23% 12%	3552
	21st to end	Night	34% 7% 13% 24% 21% 1	3978
August	1st to 10th	Night	43% 10% 16% 22% 9% 1	2904
	11th to 20th	Night	41% 7% 15% 26% 12%	2986
	21st to end	Night	36% 8% 14% 30% 11% 1	3586
September	1st to 10th	Night	38% 7% 12% 27% 15% 2	2000
	11th to 20th	Night	32% 6% 14% 29% 18% 1	2000
	21st to end	Night	44% 7% 11% 22% 15% 1	2277
October	1st to 10th	Night	43% 7% 11% 23% 15% 1	3920
	11th to 20th	Night	36% 6% 12% 25% 17% 4	3899
	21st to end	Night	37% 6% 15% 27% 14% 1	4304
November	1st to 10th	Night	42% 6% 13% 24% 14% 2	2667
	11th to 20th	Night	51% 6% 12% 19% 10% 2	2836
	21st to end	Night	52% 7% 14% 20% 6%	2940
December	1st to 10th	Night	55% 9% 15% 18% 3	4720
	11th to 20th	Night	56% 6% 12% 15% 11% 1	5348
	21st to end	Night	64% 6% 8% 14% 7%	7150

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	37% 21% 28% 11% 3	220
	11th to 20th	Day	37% 26% 29% 7% 1	242
	21st to end	Day	26% 31% 30% 11% 2	330
February	1st to 10th	Day	33% 32% 27% 7% 1	300
	11th to 20th	Day	39% 28% 29% 5%	329
	21st to end	Day	36% 25% 28% 10% 2	414
March	1st to 10th	Day	34% 22% 29% 12% 2	500
	11th to 20th	Day	31% 24% 28% 13% 3 1	500
	21st to end	Day	33% 24% 25% 10% 5% 2	550
April	1st to 10th	Day	33% 21% 28% 14% 3 1	500
	11th to 20th	Day	29% 23% 28% 11% 7% 3	492
	21st to end	Day	26% 22% 28% 16% 6% 2	500
May	1st to 10th	Day	30% 16% 30% 14% 6% 3	503
	11th to 20th	Day	24% 17% 28% 18% 10% 2	527
	21st to end	Day	21% 11% 29% 22% 12% 5%	573
June	1st to 10th	Day	18% 17% 30% 22% 11% 2	530
	11th to 20th	Day	16% 14% 30% 27% 12% 1	530
	21st to end	Day	14% 12% 36% 25% 10% 3	530
July	1st to 10th	Day	12% 8% 30% 29% 16% 6%	525
	11th to 20th	Day	7% 7% 32% 28% 21% 4	524
	21st to end	Day	11% 8% 33% 30% 13% 4	576
August	1st to 10th	Day	10% 8% 26% 29% 20% 7%	526
	11th to 20th	Day	13% 7% 28% 28% 17% 7%	519
	21st to end	Day	14% 10% 27% 25% 16% 9%	583
September	1st to 10th	Day	18% 12% 22% 24% 17% 8%	530
	11th to 20th	Day	11% 8% 25% 24% 20% 12%	530
	21st to end	Day	25% 11% 29% 18% 14% 4	530
October	1st to 10th	Day	22% 13% 20% 24% 15% 6%	530
	11th to 20th	Day	27% 16% 28% 19% 8% 1	530
	21st to end	Day	27% 20% 28% 17% 7% 1	566
November	1st to 10th	Day	24% 19% 27% 19% 9% 1	425
	11th to 20th	Day	27% 24% 26% 18% 4	320
	21st to end	Day	32% 28% 30% 9% 2	220
December	1st to 10th	Day	28% 31% 28% 7% 4 1	220
	11th to 20th	Day	34% 29% 26% 10% 1	220
	21st to end	Day	31% 27% 29% 11% 2	242
January	1st to 10th	Night	20% 26% 37% 14% 3	840
	11th to 20th	Night	24% 23% 31% 19% 2	825
	21st to end	Night	20% 25% 34% 19% 2	880
February	1st to 10th	Night	24% 22% 34% 19% 2	800
	11th to 20th	Night	26% 26% 34% 12% 1	783
	21st to end	Night	28% 23% 32% 15% 2	660
March	1st to 10th	Night	23% 26% 32% 17% 2	800
	11th to 20th	Night	27% 21% 30% 19% 4	800
	21st to end	Night	23% 23% 32% 16% 6% 1	880
April	1st to 10th	Night	26% 20% 31% 20% 3	800
	11th to 20th	Night	25% 20% 29% 20% 6% 1	791
	21st to end	Night	23% 13% 32% 26% 7%	795
May	1st to 10th	Night	28% 9% 23% 28% 10% 1	510
	11th to 20th	Night	18% 12% 29% 32% 9%	394
	21st to end	Night	14% 10% 27% 32% 16%	433
June	1st to 10th	Night	16% 8% 26% 37% 14% 1	400
	11th to 20th	Night	15% 10% 23% 38% 15%	400
	21st to end	Night	10% 5% 30% 43% 14%	400
July	1st to 10th	Night	9% 5% 22% 45% 16% 2	390
	11th to 20th	Night	9% 3 21% 43% 21% 3	388
	21st to end	Night	13% 5% 16% 48% 17% 2	509
August	1st to 10th	Night	8% 3 21% 41% 25% 2	597
	11th to 20th	Night	12% 5% 16% 36% 27% 3	639
	21st to end	Night	12% 5% 18% 38% 25% 2	880
September	1st to 10th	Night	14% 8% 24% 35% 19% 2	800
	11th to 20th	Night	13% 5% 20% 29% 27% 5%	800
	21st to end	Night	19% 10% 23% 28% 18% 2	800
October	1st to 10th	Night	19% 11% 23% 25% 19% 3	800
	11th to 20th	Night	21% 16% 27% 27% 8% 1	800
	21st to end	Night	26% 16% 29% 25% 5%	880
November	1st to 10th	Night	19% 15% 32% 26% 7%	820
	11th to 20th	Night	25% 20% 29% 19% 6% 1	840
	21st to end	Night	24% 19% 32% 21% 3 1	840
December	1st to 10th	Night	26% 22% 31% 17% 4	840
	11th to 20th	Night	25% 21% 30% 21% 3	840
	21st to end	Night	25% 22% 33% 17% 3	924

Page generated at 2026-01-14 01:14:30. Version ac07

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