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 2024-06-17.

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	15% 10% 4 9% 6% 5% 5% 4 5% 7% 32%	89466
	Night	15% 10% 4 9% 5% 5% 5% 4 5% 6% 33%	89394
Transparency	Day	51% 7% 11% 20% 10% 1	89187
	Night	51% 7% 12% 19% 10% 1	89226
Seeing	Day	23% 17% 29% 19% 10% 3	14188
	Night	20% 16% 28% 25% 9% 1	23559

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	13% 16% 8% 11% 5% 5% 4 2 4 4 27%	2517
	11th to 20th	Day	11% 14% 7% 19% 6% 6% 5% 4 4 4 20%	2616
	21st to end	Day	17% 15% 10% 12% 7% 4 5% 4 4 4 19%	3124
February	1st to 10th	Day	14% 15% 4 12% 7% 6% 5% 3 5% 4 25%	1710
	11th to 20th	Day	13% 12% 5% 13% 6% 5% 6% 3 5% 6% 26%	1690
	21st to end	Day	17% 13% 3 12% 6% 4 3 3 5% 6% 27%	1570
March	1st to 10th	Day	22% 14% 5% 9% 5% 4 4 2 3 4 27%	3262
	11th to 20th	Day	9% 14% 4 11% 6% 5% 4 3 4 5% 35%	3480
	21st to end	Day	16% 11% 4 9% 5% 4 4 4 5% 6% 32%	3940
April	1st to 10th	Day	15% 13% 4 9% 6% 4 4 3 4 6% 32%	2280
	11th to 20th	Day	15% 12% 3 7% 6% 4 5% 3 6% 6% 33%	2254
	21st to end	Day	17% 9% 3 7% 5% 3 4 3 6% 6% 35%	2299
May	1st to 10th	Day	23% 9% 3 6% 4 4 4 3 5% 6% 32%	4258
	11th to 20th	Day	19% 9% 3 8% 6% 5% 5% 4 6% 8% 26%	4398
	21st to end	Day	11% 7% 2 7% 4 4 4 4 7% 9% 41%	4837
June	1st to 10th	Day	15% 7% 2 7% 6% 5% 5% 4 6% 8% 34%	2660
	11th to 20th	Day	12% 7% 3 7% 5% 5% 5% 4 7% 8% 36%	2607
	21st to end	Day	11% 6% 3 7% 5% 6% 5% 5% 7% 9% 37%	2520
July	1st to 10th	Day	9% 6% 2 7% 6% 7% 5% 5% 7% 9% 36%	2520
	11th to 20th	Day	8% 6% 2 7% 6% 6% 5% 4 7% 10% 39%	2520
	21st to end	Day	11% 6% 3 7% 6% 6% 6% 5% 8% 7% 35%	2677
August	1st to 10th	Day	9% 6% 3 7% 5% 6% 6% 6% 7% 10% 35%	2327
	11th to 20th	Day	12% 7% 3 8% 5% 5% 6% 5% 7% 9% 33%	2244
	21st to end	Day	12% 7% 2 8% 6% 4 6% 4 6% 9% 35%	2376
September	1st to 10th	Day	15% 7% 3 6% 5% 4 5% 4 5% 8% 39%	2160
	11th to 20th	Day	12% 8% 2 6% 4 5% 4 3 5% 6% 45%	2160
	21st to end	Day	16% 6% 3 7% 5% 5% 4 4 6% 8% 37%	1906
October	1st to 10th	Day	16% 8% 3 7% 5% 5% 5% 4 6% 8% 35%	1800
	11th to 20th	Day	17% 8% 3 9% 6% 5% 5% 3 4 7% 34%	1800
	21st to end	Day	18% 12% 3 8% 5% 5% 5% 4 5% 6% 27%	1954
November	1st to 10th	Day	13% 10% 3 8% 4 4 4 4 5% 6% 39%	1671
	11th to 20th	Day	13% 11% 4 8% 7% 4 5% 4 6% 6% 31%	1611
	21st to end	Day	15% 13% 3 8% 6% 5% 5% 3 6% 6% 30%	1520
December	1st to 10th	Day	17% 15% 6% 10% 7% 4 5% 4 6% 6% 21%	1520
	11th to 20th	Day	19% 13% 6% 10% 5% 3 4 4 4 5% 27%	1906
	21st to end	Day	20% 18% 6% 11% 6% 5% 4 4 4 5% 17%	2772
January	1st to 10th	Night	13% 13% 7% 12% 6% 5% 5% 4 5% 6% 25%	4429
	11th to 20th	Night	12% 12% 6% 14% 6% 5% 4 5% 5% 6% 24%	4340
	21st to end	Night	20% 14% 6% 14% 8% 6% 4 3 4 4 18%	4532
February	1st to 10th	Night	14% 10% 5% 8% 7% 6% 5% 4 6% 6% 28%	2470
	11th to 20th	Night	12% 11% 4 10% 7% 6% 7% 5% 6% 6% 27%	2375
	21st to end	Night	16% 12% 4 12% 6% 4 5% 5% 5% 5% 27%	1884
March	1st to 10th	Night	18% 13% 5% 10% 6% 5% 4 3 4 4 28%	3574
	11th to 20th	Night	11% 14% 5% 9% 7% 5% 4 4 5% 6% 30%	3479
	21st to end	Night	13% 11% 4 9% 5% 4 4 3 5% 5% 37%	3691
April	1st to 10th	Night	14% 12% 4 9% 5% 4 5% 4 6% 6% 30%	1900
	11th to 20th	Night	17% 8% 3 7% 4 4 4 3 7% 7% 35%	1875
	21st to end	Night	16% 9% 3 6% 6% 4 3 3 6% 6% 38%	1895
May	1st to 10th	Night	25% 9% 3 7% 4 3 3 2 4 6% 32%	2683
	11th to 20th	Night	20% 9% 3 6% 4 4 5% 4 6% 7% 32%	2495
	21st to end	Night	9% 6% 3 7% 5% 5% 5% 5% 7% 8% 40%	2738
June	1st to 10th	Night	13% 7% 2 6% 5% 4 5% 3 6% 8% 40%	1520
	11th to 20th	Night	11% 6% 2 8% 5% 4 5% 5% 6% 9% 39%	1496
	21st to end	Night	8% 6% 3 6% 5% 4 5% 4 6% 7% 46%	1440
July	1st to 10th	Night	8% 5% 2 7% 5% 4 5% 4 7% 8% 45%	1440
	11th to 20th	Night	8% 4 2 5% 4 5% 5% 4 7% 10% 46%	1440
	21st to end	Night	10% 7% 2 6% 4 5% 5% 4 6% 8% 43%	1637
August	1st to 10th	Night	6% 5% 2 7% 4 4 5% 5% 7% 8% 46%	1611
	11th to 20th	Night	10% 7% 2 8% 5% 4 5% 5% 7% 7% 39%	1638
	21st to end	Night	9% 5% 2 6% 5% 5% 6% 4 6% 8% 44%	1980
September	1st to 10th	Night	14% 6% 2 6% 4 5% 4 4 5% 6% 44%	1800
	11th to 20th	Night	12% 6% 1 6% 3 4 3 3 5% 8% 50%	1800
	21st to end	Night	14% 6% 3 5% 4 4 5% 4 6% 7% 41%	2048
October	1st to 10th	Night	15% 7% 3 7% 3 4 4 4 5% 7% 40%	2160
	11th to 20th	Night	16% 9% 2 6% 4 5% 4 3 5% 6% 40%	2160
	21st to end	Night	20% 11% 3 8% 5% 5% 3 3 5% 7% 31%	2400
November	1st to 10th	Night	9% 11% 2 7% 5% 5% 4 3 5% 7% 42%	2407
	11th to 20th	Night	16% 10% 3 8% 4 5% 5% 4 6% 6% 32%	2565
	21st to end	Night	12% 11% 3 9% 6% 5% 6% 4 6% 7% 31%	2660
December	1st to 10th	Night	16% 13% 5% 10% 7% 5% 5% 5% 7% 7% 22%	2660
	11th to 20th	Night	17% 12% 5% 11% 6% 5% 5% 3 4 5% 26%	3288
	21st to end	Night	21% 16% 5% 10% 6% 5% 4 3 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% 5% 11% 18% 4 1	2518
	11th to 20th	Day	67% 6% 9% 12% 6% 1	2616
	21st to end	Day	69% 6% 9% 12% 4 1	3124
February	1st to 10th	Day	63% 5% 11% 13% 8% 1	1710
	11th to 20th	Day	57% 7% 7% 19% 8%	1699
	21st to end	Day	58% 5% 9% 18% 8% 2	1570
March	1st to 10th	Day	61% 4 8% 20% 6% 1	3265
	11th to 20th	Day	50% 6% 13% 20% 9% 2	3480
	21st to end	Day	51% 7% 9% 18% 14% 2	3940
April	1st to 10th	Day	54% 4 9% 21% 10% 2	2280
	11th to 20th	Day	50% 6% 10% 19% 14% 1	2254
	21st to end	Day	48% 5% 10% 20% 13% 3	2299
May	1st to 10th	Day	52% 6% 9% 21% 11% 2	4270
	11th to 20th	Day	55% 9% 10% 18% 7% 1	4402
	21st to end	Day	38% 8% 12% 26% 14% 2	4837
June	1st to 10th	Day	46% 8% 12% 20% 13% 1	2660
	11th to 20th	Day	44% 7% 14% 21% 12% 1	2607
	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	59% 6% 11% 17% 6% 1	4429
	11th to 20th	Night	59% 7% 12% 15% 5%	4340
	21st to end	Night	69% 6% 7% 13% 5%	4532
February	1st to 10th	Night	55% 6% 12% 18% 8% 1	2470
	11th to 20th	Night	57% 7% 10% 17% 8% 1	2377
	21st to end	Night	56% 6% 10% 16% 10% 2	1884
March	1st to 10th	Night	59% 5% 10% 17% 8% 1	3584
	11th to 20th	Night	53% 7% 13% 20% 6% 1	3480
	21st to end	Night	48% 5% 9% 22% 14% 3	3691
April	1st to 10th	Night	54% 6% 10% 18% 11% 1	1900
	11th to 20th	Night	47% 6% 13% 18% 15% 1	1875
	21st to end	Night	45% 6% 12% 20% 15% 2	1895
May	1st to 10th	Night	54% 5% 10% 21% 8% 2	2690
	11th to 20th	Night	50% 12% 13% 15% 9% 1	2496
	21st to end	Night	37% 11% 14% 19% 16% 2	2739
June	1st to 10th	Night	41% 6% 11% 25% 15% 1	1520
	11th to 20th	Night	40% 9% 14% 24% 11% 2	1496
	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% 27% 30% 8% 1	207
	21st to end	Day	26% 29% 31% 11% 3	297
February	1st to 10th	Day	32% 32% 27% 7% 1	270
	11th to 20th	Day	35% 29% 31% 6%	297
	21st to end	Day	37% 24% 27% 10% 2	382
March	1st to 10th	Day	33% 23% 29% 13% 3	460
	11th to 20th	Day	31% 24% 28% 13% 3 1	460
	21st to end	Day	34% 24% 25% 11% 6% 2	506
April	1st to 10th	Day	32% 20% 29% 15% 3 1	460
	11th to 20th	Day	26% 24% 29% 11% 8% 3	452
	21st to end	Day	27% 22% 28% 17% 5% 2	460
May	1st to 10th	Day	29% 16% 30% 15% 7% 3	463
	11th to 20th	Day	23% 17% 28% 19% 10% 3	487
	21st to end	Day	17% 11% 30% 23% 13% 5%	529
June	1st to 10th	Day	17% 17% 31% 22% 12% 2	490
	11th to 20th	Day	15% 14% 31% 27% 13% 1	475
	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% 23% 31% 21% 3	760
	21st to end	Night	20% 26% 33% 20% 2	836
February	1st to 10th	Night	24% 21% 34% 19% 2	760
	11th to 20th	Night	25% 26% 35% 12% 1	743
	21st to end	Night	29% 22% 31% 16% 3	628
March	1st to 10th	Night	23% 25% 32% 17% 3	760
	11th to 20th	Night	27% 21% 30% 18% 4	760
	21st to end	Night	23% 22% 32% 16% 6% 1	836
April	1st to 10th	Night	25% 20% 32% 20% 3	760
	11th to 20th	Night	25% 19% 29% 20% 7% 1	751
	21st to end	Night	23% 13% 32% 26% 7%	755
May	1st to 10th	Night	28% 9% 24% 28% 11% 1	485
	11th to 20th	Night	17% 11% 30% 32% 9%	374
	21st to end	Night	13% 10% 27% 33% 17%	411
June	1st to 10th	Night	16% 7% 26% 37% 14% 1	380
	11th to 20th	Night	13% 10% 23% 38% 16%	374
	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 2024-06-14 13:06:16. Version ac07

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