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 2024-01-14.

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% 9% 4 7% 7% 4 5% 5% 6% 7% 32%	74716
	Night	14% 9% 4 7% 6% 4 5% 5% 5% 7% 34%	75026
Transparency	Day	50% 7% 12% 19% 11% 1	74425
	Night	49% 7% 12% 20% 11% 1	74851
Seeing	Day	23% 17% 28% 19% 10% 3	13608
	Night	20% 16% 28% 25% 9% 1	23030

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	10% 12% 7% 11% 8% 4 7% 4 6% 6% 26%	1517
	11th to 20th	Day	12% 12% 5% 15% 8% 4 6% 6% 5% 6% 21%	1518
	21st to end	Day	10% 12% 6% 13% 10% 4 6% 6% 5% 5% 23%	1782
February	1st to 10th	Day	15% 14% 6% 12% 8% 4 6% 4 5% 4 23%	1620
	11th to 20th	Day	14% 10% 6% 11% 8% 4 6% 5% 5% 6% 26%	1599
	21st to end	Day	18% 12% 3 11% 8% 3 4 4 5% 6% 26%	1480
March	1st to 10th	Day	13% 12% 6% 10% 7% 4 5% 4 4 5% 30%	1873
	11th to 20th	Day	14% 12% 5% 8% 8% 3 4 4 3 6% 32%	1980
	21st to end	Day	17% 12% 5% 7% 6% 4 5% 4 5% 5% 30%	2248
April	1st to 10th	Day	13% 11% 5% 8% 7% 3 4 4 4 6% 34%	2160
	11th to 20th	Day	16% 11% 3 7% 6% 3 5% 4 5% 6% 34%	2134
	21st to end	Day	17% 9% 4 6% 6% 2 4 4 6% 6% 35%	2178
May	1st to 10th	Day	17% 10% 4 7% 6% 4 6% 5% 5% 6% 32%	2420
	11th to 20th	Day	17% 7% 4 6% 7% 3 5% 4 6% 8% 32%	2478
	21st to end	Day	13% 7% 3 6% 6% 4 6% 5% 5% 8% 39%	2725
June	1st to 10th	Day	16% 6% 3 6% 7% 4 4 5% 6% 8% 35%	2520
	11th to 20th	Day	13% 7% 3 7% 6% 4 6% 5% 6% 8% 36%	2520
	21st to end	Day	11% 6% 3 6% 6% 4 6% 5% 7% 9% 37%	2520
July	1st to 10th	Day	9% 5% 2 6% 7% 5% 6% 6% 7% 9% 37%	2520
	11th to 20th	Day	8% 5% 2 6% 6% 4 6% 5% 7% 10% 39%	2520
	21st to end	Day	11% 5% 3 6% 7% 4 7% 6% 8% 8% 35%	2677
August	1st to 10th	Day	9% 6% 3 6% 6% 4 6% 7% 7% 10% 35%	2327
	11th to 20th	Day	12% 7% 3 6% 7% 4 6% 7% 7% 9% 33%	2244
	21st to end	Day	12% 7% 3 6% 8% 3 6% 5% 6% 9% 35%	2376
September	1st to 10th	Day	15% 7% 3 5% 5% 3 5% 5% 5% 8% 39%	2160
	11th to 20th	Day	12% 7% 2 6% 5% 4 4 5% 5% 6% 45%	2160
	21st to end	Day	16% 6% 3 5% 6% 3 5% 5% 6% 8% 37%	1906
October	1st to 10th	Day	16% 7% 3 6% 5% 3 5% 5% 6% 8% 35%	1800
	11th to 20th	Day	17% 8% 3 7% 7% 4 5% 4 4 7% 34%	1800
	21st to end	Day	19% 11% 4 7% 7% 4 5% 5% 5% 6% 27%	1954
November	1st to 10th	Day	14% 10% 4 7% 5% 3 4 5% 4 6% 39%	1671
	11th to 20th	Day	14% 11% 4 7% 8% 3 5% 5% 6% 6% 32%	1611
	21st to end	Day	16% 12% 4 7% 6% 3 5% 5% 6% 7% 30%	1520
December	1st to 10th	Day	17% 13% 8% 8% 8% 4 4 5% 6% 6% 21%	1520
	11th to 20th	Day	19% 12% 6% 9% 5% 3 4 5% 4 5% 27%	1906
	21st to end	Day	21% 17% 6% 9% 8% 3 5% 4 4 5% 17%	2772
January	1st to 10th	Night	11% 11% 6% 10% 8% 4 6% 6% 6% 7% 26%	2649
	11th to 20th	Night	13% 10% 5% 11% 8% 5% 5% 7% 5% 8% 23%	2511
	21st to end	Night	9% 11% 4 10% 10% 5% 8% 6% 6% 8% 24%	2574
February	1st to 10th	Night	15% 9% 5% 8% 8% 4 6% 6% 6% 7% 27%	2340
	11th to 20th	Night	13% 10% 5% 9% 8% 5% 6% 7% 6% 6% 26%	2246
	21st to end	Night	16% 10% 4 10% 8% 3 5% 5% 5% 6% 27%	1776
March	1st to 10th	Night	11% 10% 6% 10% 8% 4 6% 5% 5% 5% 29%	2070
	11th to 20th	Night	15% 9% 4 8% 8% 4 4 4 4 6% 33%	1979
	21st to end	Night	14% 11% 4 8% 6% 3 4 5% 5% 5% 35%	2107
April	1st to 10th	Night	14% 10% 5% 8% 6% 3 6% 5% 6% 6% 31%	1800
	11th to 20th	Night	17% 7% 3 6% 5% 3 5% 4 7% 7% 36%	1775
	21st to end	Night	17% 8% 4 5% 6% 4 3 5% 5% 6% 38%	1796
May	1st to 10th	Night	20% 9% 4 6% 5% 3 3 4 5% 6% 34%	1540
	11th to 20th	Night	13% 6% 3 6% 6% 3 7% 5% 7% 7% 37%	1415
	21st to end	Night	10% 6% 3 6% 5% 4 5% 5% 6% 8% 42%	1550
June	1st to 10th	Night	14% 6% 3 6% 5% 3 5% 5% 5% 8% 40%	1440
	11th to 20th	Night	12% 5% 3 7% 6% 3 5% 5% 7% 9% 39%	1440
	21st to end	Night	8% 6% 3 5% 6% 3 4 6% 6% 8% 46%	1440
July	1st to 10th	Night	8% 5% 3 6% 6% 3 5% 4 7% 8% 45%	1440
	11th to 20th	Night	8% 3 2 4 4 3 5% 6% 7% 11% 46%	1440
	21st to end	Night	10% 6% 3 5% 5% 4 5% 5% 6% 8% 43%	1637
August	1st to 10th	Night	6% 5% 2 6% 6% 3 5% 6% 7% 9% 46%	1611
	11th to 20th	Night	10% 6% 2 7% 6% 4 4 6% 7% 7% 39%	1638
	21st to end	Night	10% 5% 3 5% 5% 3 6% 6% 6% 8% 44%	1980
September	1st to 10th	Night	14% 6% 3 6% 5% 4 4 5% 5% 6% 44%	1800
	11th to 20th	Night	12% 5% 1 5% 4 3 3 4 5% 8% 50%	1800
	21st to end	Night	14% 6% 3 5% 5% 3 5% 5% 6% 7% 41%	2048
October	1st to 10th	Night	15% 7% 3 6% 4 3 4 5% 5% 7% 40%	2160
	11th to 20th	Night	16% 8% 3 5% 5% 3 4 5% 5% 7% 40%	2160
	21st to end	Night	20% 10% 3 7% 6% 4 4 4 5% 7% 31%	2400
November	1st to 10th	Night	10% 10% 3 6% 5% 3 5% 4 4 7% 42%	2407
	11th to 20th	Night	16% 9% 3 7% 5% 3 6% 5% 6% 6% 32%	2565
	21st to end	Night	13% 10% 4 8% 6% 4 5% 6% 6% 7% 31%	2660
December	1st to 10th	Night	16% 12% 5% 9% 8% 4 5% 5% 6% 8% 23%	2660
	11th to 20th	Night	17% 12% 5% 9% 7% 4 6% 4 4 5% 27%	3288
	21st to end	Night	21% 15% 6% 9% 7% 3 5% 4 5% 5% 20%	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	60% 6% 10% 17% 6% 1	1518
	11th to 20th	Day	64% 8% 10% 11% 6% 1	1518
	21st to end	Day	62% 5% 11% 14% 6% 1	1782
February	1st to 10th	Day	64% 5% 10% 11% 8% 1	1620
	11th to 20th	Day	59% 7% 7% 18% 8%	1608
	21st to end	Day	60% 5% 9% 17% 8% 2	1480
March	1st to 10th	Day	57% 5% 9% 19% 8% 2	1876
	11th to 20th	Day	55% 4 9% 19% 11% 3	1980
	21st to end	Day	56% 5% 9% 16% 12% 2	2248
April	1st to 10th	Day	53% 4 9% 21% 10% 2	2160
	11th to 20th	Day	50% 5% 11% 18% 14% 1	2134
	21st to end	Day	49% 5% 10% 20% 12% 3	2178
May	1st to 10th	Day	52% 6% 10% 20% 11% 3	2420
	11th to 20th	Day	50% 7% 10% 19% 12% 2	2482
	21st to end	Day	44% 8% 14% 21% 12% 2	2725
June	1st to 10th	Day	46% 8% 11% 20% 13% 1	2520
	11th to 20th	Day	45% 7% 14% 21% 12% 1	2520
	21st to end	Day	41% 10% 13% 24% 12% 1	2520
July	1st to 10th	Day	42% 9% 13% 22% 13% 1	2450
	11th to 20th	Day	38% 8% 16% 24% 13% 1	2445
	21st to end	Day	43% 9% 13% 21% 14% 1	2527
August	1st to 10th	Day	41% 10% 15% 21% 12%	2314
	11th to 20th	Day	45% 8% 14% 23% 9% 1	2244
	21st to end	Day	45% 8% 12% 21% 13% 2	2376
September	1st to 10th	Day	43% 5% 13% 24% 12% 2	2160
	11th to 20th	Day	39% 7% 11% 23% 19% 2	2160
	21st to end	Day	45% 5% 14% 21% 14% 2	1906
October	1st to 10th	Day	47% 7% 12% 21% 13% 1	1800
	11th to 20th	Day	50% 6% 11% 22% 11%	1800
	21st to end	Day	56% 6% 13% 15% 8% 1	1954
November	1st to 10th	Day	46% 6% 12% 21% 13% 2	1671
	11th to 20th	Day	52% 5% 12% 20% 9% 2	1611
	21st to end	Day	53% 7% 13% 20% 7% 1	1520
December	1st to 10th	Day	63% 8% 11% 12% 6%	1520
	11th to 20th	Day	59% 6% 15% 14% 5%	1906
	21st to end	Day	69% 8% 8% 13% 3	2772
January	1st to 10th	Night	56% 7% 11% 17% 8% 1	2649
	11th to 20th	Night	58% 9% 14% 14% 5%	2511
	21st to end	Night	58% 7% 11% 16% 8% 1	2574
February	1st to 10th	Night	56% 6% 12% 17% 8% 1	2340
	11th to 20th	Night	57% 7% 10% 16% 8% 1	2248
	21st to end	Night	57% 5% 10% 16% 10% 2	1776
March	1st to 10th	Night	55% 7% 10% 19% 8% 2	2080
	11th to 20th	Night	54% 5% 11% 19% 10% 1	1980
	21st to end	Night	52% 5% 9% 17% 14% 3	2107
April	1st to 10th	Night	53% 6% 10% 18% 11% 2	1800
	11th to 20th	Night	46% 6% 14% 18% 15% 1	1775
	21st to end	Night	46% 6% 12% 19% 14% 3	1796
May	1st to 10th	Night	50% 6% 11% 20% 11% 3	1540
	11th to 20th	Night	44% 9% 11% 19% 16% 2	1416
	21st to end	Night	38% 9% 15% 22% 13% 2	1551
June	1st to 10th	Night	42% 6% 11% 25% 15% 1	1440
	11th to 20th	Night	40% 9% 14% 24% 11% 2	1440
	21st to end	Night	35% 9% 13% 28% 14% 1	1440
July	1st to 10th	Night	36% 9% 15% 25% 14% 2	1400
	11th to 20th	Night	32% 9% 17% 24% 17% 1	1392
	21st to end	Night	37% 9% 15% 21% 16% 2	1546
August	1st to 10th	Night	32% 10% 18% 28% 12% 1	1600
	11th to 20th	Night	40% 10% 14% 24% 12%	1638
	21st to end	Night	36% 9% 14% 24% 15% 1	1980
September	1st to 10th	Night	40% 7% 12% 26% 13% 2	1800
	11th to 20th	Night	33% 6% 14% 27% 19% 1	1800
	21st to end	Night	41% 8% 11% 23% 17% 1	2048
October	1st to 10th	Night	43% 8% 14% 22% 13% 1	2160
	11th to 20th	Night	44% 7% 13% 23% 11% 2	2160
	21st to end	Night	53% 6% 12% 18% 9% 1	2400
November	1st to 10th	Night	42% 6% 13% 23% 14% 2	2407
	11th to 20th	Night	51% 5% 13% 19% 10% 2	2565
	21st to end	Night	50% 7% 15% 21% 6%	2660
December	1st to 10th	Night	59% 8% 14% 15% 4	2660
	11th to 20th	Night	60% 6% 11% 16% 7% 1	3288
	21st to end	Night	66% 6% 10% 15% 3	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	35% 20% 29% 12% 3 1	180
	11th to 20th	Day	34% 26% 30% 8% 1 1	190
	21st to end	Day	25% 31% 30% 10% 3	264
February	1st to 10th	Day	34% 33% 26% 6%	240
	11th to 20th	Day	36% 29% 31% 4	266
	21st to end	Day	37% 25% 26% 10% 2	346
March	1st to 10th	Day	32% 23% 30% 13% 2	420
	11th to 20th	Day	31% 24% 28% 13% 4 1	420
	21st to end	Day	35% 23% 24% 11% 6% 2	462
April	1st to 10th	Day	30% 20% 30% 15% 4 1	420
	11th to 20th	Day	25% 23% 29% 11% 8% 3	412
	21st to end	Day	28% 22% 28% 15% 5% 2	420
May	1st to 10th	Day	29% 15% 30% 16% 7% 4	423
	11th to 20th	Day	23% 18% 28% 19% 10% 2	447
	21st to end	Day	18% 11% 30% 22% 13% 6%	485
June	1st to 10th	Day	17% 17% 31% 22% 11% 2	450
	11th to 20th	Day	15% 14% 30% 27% 13% 1	450
	21st to end	Day	13% 12% 36% 25% 11% 3	450
July	1st to 10th	Day	13% 8% 29% 28% 16% 7%	445
	11th to 20th	Day	7% 6% 32% 29% 21% 5%	444
	21st to end	Day	11% 8% 34% 29% 14% 4	488
August	1st to 10th	Day	8% 8% 28% 30% 20% 7%	446
	11th to 20th	Day	13% 6% 29% 27% 17% 8%	439
	21st to end	Day	13% 10% 27% 24% 16% 9%	495
September	1st to 10th	Day	18% 12% 21% 24% 17% 8%	450
	11th to 20th	Day	12% 10% 26% 24% 18% 10%	450
	21st to end	Day	21% 11% 30% 20% 14% 4	450
October	1st to 10th	Day	23% 13% 21% 24% 15% 5%	450
	11th to 20th	Day	26% 16% 30% 20% 8% 1	450
	21st to end	Day	29% 20% 27% 17% 6% 1	482
November	1st to 10th	Day	23% 18% 25% 21% 11% 1	365
	11th to 20th	Day	27% 23% 27% 18% 5%	271
	21st to end	Day	27% 29% 32% 9% 2	180
December	1st to 10th	Day	29% 29% 28% 8% 5% 1	180
	11th to 20th	Day	33% 29% 26% 11% 1 1	180
	21st to end	Day	32% 27% 28% 11% 2	198
January	1st to 10th	Night	20% 26% 36% 15% 3	760
	11th to 20th	Night	23% 22% 31% 21% 3	735
	21st to end	Night	19% 26% 34% 20% 2	792
February	1st to 10th	Night	25% 23% 34% 17% 2	720
	11th to 20th	Night	26% 26% 34% 13% 1	703
	21st to end	Night	29% 23% 31% 15% 2	592
March	1st to 10th	Night	22% 25% 33% 17% 2	720
	11th to 20th	Night	27% 20% 30% 18% 4	720
	21st to end	Night	23% 21% 33% 16% 6% 1	792
April	1st to 10th	Night	25% 21% 31% 20% 4	720
	11th to 20th	Night	23% 19% 30% 20% 7% 1	711
	21st to end	Night	23% 13% 32% 25% 6%	716
May	1st to 10th	Night	27% 9% 23% 28% 11% 1	460
	11th to 20th	Night	16% 12% 31% 32% 9%	354
	21st to end	Night	13% 11% 27% 31% 17% 1	389
June	1st to 10th	Night	16% 7% 25% 37% 14% 1	360
	11th to 20th	Night	14% 10% 23% 37% 16%	360
	21st to end	Night	9% 4 30% 44% 13%	360
July	1st to 10th	Night	10% 5% 22% 43% 18% 2	350
	11th to 20th	Night	9% 3 21% 43% 21% 3	348
	21st to end	Night	14% 5% 16% 47% 16% 2	457
August	1st to 10th	Night	8% 3 21% 42% 25% 1	537
	11th to 20th	Night	12% 4 16% 36% 27% 4	574
	21st to end	Night	11% 5% 18% 38% 26% 2	792
September	1st to 10th	Night	15% 7% 23% 35% 17% 2	720
	11th to 20th	Night	14% 6% 22% 29% 24% 5%	720
	21st to end	Night	16% 10% 24% 29% 18% 2	720
October	1st to 10th	Night	20% 11% 23% 26% 18% 2	720
	11th to 20th	Night	21% 16% 27% 28% 8%	720
	21st to end	Night	27% 16% 28% 24% 4	792
November	1st to 10th	Night	18% 15% 32% 27% 8%	740
	11th to 20th	Night	24% 19% 30% 19% 7% 1	760
	21st to end	Night	23% 18% 32% 22% 4 1	760
December	1st to 10th	Night	26% 22% 31% 16% 4	760
	11th to 20th	Night	24% 21% 31% 21% 3	760
	21st to end	Night	24% 22% 35% 17% 2	836

Page generated at 2024-01-11 04:22:38. Version ac07

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