Mt. Pisgah Parking Lot
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Mt. Pisgah Parking Lot clear sky chart from 2005-11-06 to 2024-11-10.

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	11% 7% 3 7% 5% 5% 6% 5% 6% 7% 38%	101147
	Night	11% 7% 2 6% 5% 5% 5% 4 6% 8% 42%	97955
Transparency	Day	41% 8% 12% 18% 16% 5%	104902
	Night	37% 9% 13% 18% 17% 6%	102326
Seeing	Day	19% 16% 24% 21% 13% 7%	15051
	Night	16% 14% 22% 26% 18% 4	25094

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% 6% 2 5% 3 3 3 4 6% 8% 50%	2836
	11th to 20th	Day	9% 8% 2 6% 3 4 5% 4 6% 5% 50%	2840
	21st to end	Day	15% 8% 3 7% 4 4 4 3 5% 6% 43%	3124
February	1st to 10th	Day	10% 9% 2 7% 4 5% 4 5% 5% 6% 43%	1809
	11th to 20th	Day	11% 7% 3 7% 4 4 4 4 5% 6% 43%	1848
	21st to end	Day	11% 7% 2 6% 5% 6% 5% 5% 6% 6% 41%	1570
March	1st to 10th	Day	18% 7% 2 5% 4 3 4 4 6% 6% 41%	3342
	11th to 20th	Day	10% 7% 3 6% 4 4 4 3 4 5% 51%	3480
	21st to end	Day	15% 9% 2 7% 5% 4 4 4 5% 6% 38%	3815
April	1st to 10th	Day	9% 6% 2 6% 5% 4 5% 4 6% 10% 43%	2090
	11th to 20th	Day	12% 7% 3 6% 5% 4 4 4 6% 8% 41%	2273
	21st to end	Day	11% 6% 2 7% 5% 5% 4 4 5% 7% 45%	2470
May	1st to 10th	Day	10% 7% 3 9% 6% 5% 5% 5% 7% 8% 35%	4082
	11th to 20th	Day	15% 8% 3 8% 6% 6% 6% 4 6% 7% 32%	4081
	21st to end	Day	8% 5% 2 7% 6% 6% 6% 6% 8% 9% 38%	4476
June	1st to 10th	Day	11% 7% 3 9% 7% 6% 7% 6% 8% 9% 28%	2470
	11th to 20th	Day	8% 6% 3 8% 6% 7% 7% 6% 8% 9% 31%	2470
	21st to end	Day	8% 6% 3 9% 7% 7% 7% 5% 8% 9% 32%	2470
July	1st to 10th	Day	7% 6% 2 9% 7% 8% 8% 6% 9% 10% 28%	4120
	11th to 20th	Day	10% 7% 3 10% 8% 7% 8% 6% 7% 8% 26%	4120
	21st to end	Day	10% 10% 5% 12% 10% 8% 9% 6% 7% 8% 15%	4466
August	1st to 10th	Day	14% 8% 3 9% 7% 8% 7% 6% 8% 10% 21%	4104
	11th to 20th	Day	9% 7% 3 9% 7% 7% 7% 6% 8% 10% 26%	4044
	21st to end	Day	7% 5% 3 8% 6% 6% 7% 5% 7% 8% 40%	4165
September	1st to 10th	Day	11% 7% 3 9% 7% 6% 6% 5% 6% 6% 35%	2090
	11th to 20th	Day	18% 7% 3 9% 5% 5% 5% 4 6% 7% 31%	2090
	21st to end	Day	16% 8% 3 6% 6% 5% 5% 4 5% 6% 37%	2090
October	1st to 10th	Day	14% 7% 2 6% 4 4 4 4 4 5% 47%	2069
	11th to 20th	Day	9% 6% 2 5% 4 3 4 4 4 6% 54%	1900
	21st to end	Day	11% 5% 2 5% 3 3 3 2 5% 5% 55%	2090
November	1st to 10th	Day	9% 8% 2 4 3 3 3 3 4 5% 55%	1846
	11th to 20th	Day	8% 6% 2 5% 4 4 4 4 6% 6% 52%	1710
	21st to end	Day	10% 5% 2 6% 4 3 4 4 5% 7% 49%	1710
December	1st to 10th	Day	10% 7% 4 8% 6% 6% 5% 4 5% 7% 39%	1710
	11th to 20th	Day	10% 4 2 5% 4 5% 5% 4 6% 7% 49%	2153
	21st to end	Day	14% 6% 3 5% 4 4 4 4 5% 6% 43%	3124
January	1st to 10th	Night	12% 5% 2 5% 4 3 5% 4 6% 6% 48%	4109
	11th to 20th	Night	7% 6% 2 5% 4 4 5% 5% 6% 7% 50%	4120
	21st to end	Night	14% 11% 3 6% 4 4 5% 3 4 5% 41%	4532
February	1st to 10th	Night	7% 7% 3 6% 5% 5% 5% 4 6% 7% 45%	2366
	11th to 20th	Night	11% 9% 2 6% 5% 5% 4 4 5% 5% 42%	2218
	21st to end	Night	10% 7% 2 6% 6% 6% 5% 4 7% 7% 39%	1884
March	1st to 10th	Night	16% 12% 3 8% 6% 5% 5% 4 5% 5% 32%	3509
	11th to 20th	Night	8% 5% 2 5% 4 4 5% 4 6% 8% 48%	3480
	21st to end	Night	15% 6% 2 6% 4 5% 5% 4 5% 7% 40%	3817
April	1st to 10th	Night	8% 6% 2 6% 4 4 4 4 7% 7% 47%	2090
	11th to 20th	Night	10% 6% 3 5% 4 4 4 3 5% 7% 48%	1870
	21st to end	Night	8% 6% 2 6% 5% 3 4 4 5% 6% 50%	1710
May	1st to 10th	Night	9% 7% 2 6% 5% 6% 5% 5% 7% 9% 38%	2813
	11th to 20th	Night	13% 7% 2 7% 5% 5% 6% 4 7% 9% 35%	2812
	21st to end	Night	8% 4 2 5% 4 4 6% 5% 7% 10% 44%	3079
June	1st to 10th	Night	8% 6% 2 7% 6% 5% 6% 5% 9% 12% 35%	1710
	11th to 20th	Night	7% 5% 2 6% 4 4 4 5% 9% 13% 40%	1710
	21st to end	Night	7% 4 2 5% 5% 5% 6% 5% 7% 11% 42%	1710
July	1st to 10th	Night	6% 6% 3 8% 7% 8% 7% 6% 8% 11% 31%	2840
	11th to 20th	Night	6% 6% 2 6% 5% 6% 6% 5% 9% 13% 36%	2840
	21st to end	Night	9% 10% 4 10% 7% 7% 8% 5% 8% 9% 23%	3087
August	1st to 10th	Night	10% 8% 2 7% 6% 6% 7% 6% 8% 11% 30%	2825
	11th to 20th	Night	9% 9% 2 7% 6% 7% 7% 5% 8% 9% 30%	2785
	21st to end	Night	8% 5% 2 5% 4 4 5% 4 7% 9% 47%	3453
September	1st to 10th	Night	12% 7% 3 6% 5% 5% 5% 4 7% 8% 38%	2090
	11th to 20th	Night	18% 9% 3 7% 4 4 4 3 6% 8% 34%	2090
	21st to end	Night	15% 7% 2 6% 3 4 4 3 4 6% 45%	2090
October	1st to 10th	Night	15% 7% 2 5% 4 4 3 3 4 6% 48%	2109
	11th to 20th	Night	11% 7% 2 6% 3 3 4 3 4 5% 50%	2280
	21st to end	Night	10% 5% 2 5% 3 4 4 4 4 5% 55%	2508
November	1st to 10th	Night	10% 7% 2 5% 4 4 5% 3 5% 5% 49%	2435
	11th to 20th	Night	10% 7% 2 5% 3 4 4 3 5% 7% 50%	2470
	21st to end	Night	10% 5% 1 4 5% 4 5% 5% 6% 6% 47%	2470
December	1st to 10th	Night	10% 8% 3 7% 5% 5% 5% 5% 6% 8% 39%	2470
	11th to 20th	Night	11% 8% 2 6% 4 3 4 3 5% 5% 48%	3042
	21st to end	Night	16% 7% 3 6% 4 4 5% 4 6% 7% 37%	4532

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	30% 6% 9% 19% 29% 7%	2837
	11th to 20th	Day	36% 5% 8% 13% 29% 9%	2840
	21st to end	Day	39% 5% 9% 16% 25% 6%	3124
February	1st to 10th	Day	40% 6% 8% 20% 18% 7%	1809
	11th to 20th	Day	40% 8% 9% 16% 20% 6%	1858
	21st to end	Day	42% 8% 10% 15% 17% 8%	1570
March	1st to 10th	Day	41% 7% 8% 18% 16% 10%	3342
	11th to 20th	Day	33% 8% 8% 16% 24% 11%	3480
	21st to end	Day	44% 8% 8% 22% 14% 5%	3815
April	1st to 10th	Day	35% 8% 12% 21% 19% 5%	2090
	11th to 20th	Day	39% 7% 11% 16% 20% 7%	2273
	21st to end	Day	36% 9% 12% 24% 16% 2	2470
May	1st to 10th	Day	44% 11% 13% 19% 12% 1	4120
	11th to 20th	Day	47% 12% 11% 19% 11% 1	4085
	21st to end	Day	36% 13% 16% 19% 16% 1	4489
June	1st to 10th	Day	47% 14% 15% 17% 6% 1	2470
	11th to 20th	Day	43% 13% 17% 16% 10% 1	2470
	21st to end	Day	44% 12% 14% 17% 10% 2	2470
July	1st to 10th	Day	45% 12% 19% 17% 6% 1	4055
	11th to 20th	Day	51% 10% 19% 14% 4 1	4051
	21st to end	Day	62% 12% 14% 8% 3	4324
August	1st to 10th	Day	55% 8% 16% 18% 3	4091
	11th to 20th	Day	48% 8% 19% 12% 9% 3	4083
	21st to end	Day	40% 7% 13% 27% 12% 1	4165
September	1st to 10th	Day	46% 10% 11% 17% 14% 3	2090
	11th to 20th	Day	51% 8% 10% 16% 14% 2	2090
	21st to end	Day	45% 7% 12% 17% 14% 5%	2090
October	1st to 10th	Day	29% 4 7% 18% 30% 12%	3433
	11th to 20th	Day	21% 3 5% 17% 25% 28%	3140
	21st to end	Day	28% 2 7% 25% 20% 18%	3428
November	1st to 10th	Day	32% 4 8% 19% 27% 10%	1846
	11th to 20th	Day	31% 6% 7% 20% 27% 9%	1710
	21st to end	Day	33% 6% 8% 20% 25% 7%	1710
December	1st to 10th	Day	45% 8% 7% 19% 15% 7%	1710
	11th to 20th	Day	32% 7% 10% 16% 25% 11%	2150
	21st to end	Day	38% 7% 9% 21% 21% 5%	3124
January	1st to 10th	Night	34% 6% 11% 16% 25% 8%	4109
	11th to 20th	Night	32% 8% 9% 13% 28% 10%	4120
	21st to end	Night	41% 8% 9% 13% 22% 8%	4532
February	1st to 10th	Night	36% 7% 12% 19% 20% 6%	2366
	11th to 20th	Night	41% 7% 8% 20% 18% 6%	2219
	21st to end	Night	39% 10% 12% 16% 18% 6%	1884
March	1st to 10th	Night	46% 9% 14% 12% 13% 5%	3509
	11th to 20th	Night	30% 9% 9% 22% 19% 11%	3480
	21st to end	Night	41% 9% 11% 21% 13% 6%	3817
April	1st to 10th	Night	33% 8% 13% 22% 20% 3	2090
	11th to 20th	Night	34% 7% 12% 21% 22% 5%	1870
	21st to end	Night	33% 10% 13% 26% 17% 2	1710
May	1st to 10th	Night	40% 13% 14% 23% 9% 1	2840
	11th to 20th	Night	42% 11% 19% 18% 9%	2813
	21st to end	Night	28% 14% 20% 27% 10% 1	3087
June	1st to 10th	Night	38% 15% 20% 20% 7% 1	1710
	11th to 20th	Night	33% 12% 25% 22% 8% 1	1710
	21st to end	Night	32% 14% 21% 19% 12% 3	1710
July	1st to 10th	Night	44% 13% 21% 17% 5%	2795
	11th to 20th	Night	37% 14% 27% 17% 4 1	2786
	21st to end	Night	52% 14% 17% 12% 4	2988
August	1st to 10th	Night	46% 10% 24% 16% 4	2814
	11th to 20th	Night	44% 9% 22% 14% 10%	2812
	21st to end	Night	33% 9% 17% 31% 10% 1	3453
September	1st to 10th	Night	41% 12% 14% 19% 12% 2	2090
	11th to 20th	Night	48% 8% 12% 17% 14% 1	2090
	21st to end	Night	41% 6% 12% 22% 16% 4	2090
October	1st to 10th	Night	29% 4 9% 19% 29% 10%	3512
	11th to 20th	Night	22% 4 7% 19% 26% 23%	3779
	21st to end	Night	30% 3 7% 22% 22% 16%	4120
November	1st to 10th	Night	34% 7% 10% 18% 22% 9%	2435
	11th to 20th	Night	33% 6% 8% 17% 25% 10%	2470
	21st to end	Night	35% 7% 8% 20% 23% 8%	2470
December	1st to 10th	Night	42% 9% 12% 15% 16% 6%	2470
	11th to 20th	Night	33% 7% 12% 14% 25% 9%	3044
	21st to end	Night	42% 7% 10% 17% 20% 4	4532

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	27% 32% 32% 8% 1	270
	11th to 20th	Day	33% 25% 29% 11% 2	270
	21st to end	Day	23% 39% 30% 6% 2	297
February	1st to 10th	Day	27% 31% 31% 9% 2	270
	11th to 20th	Day	37% 34% 26% 3	270
	21st to end	Day	35% 37% 21% 6%	225
March	1st to 10th	Day	24% 27% 29% 14% 5%	401
	11th to 20th	Day	27% 28% 27% 12% 4 1	460
	21st to end	Day	24% 26% 30% 15% 5%	506
April	1st to 10th	Day	22% 25% 28% 18% 6% 1	460
	11th to 20th	Day	19% 25% 25% 19% 9% 2	452
	21st to end	Day	20% 19% 29% 19% 10% 3	460
May	1st to 10th	Day	15% 23% 30% 20% 7% 5%	463
	11th to 20th	Day	17% 14% 25% 24% 12% 7%	487
	21st to end	Day	15% 10% 21% 28% 15% 11%	529
June	1st to 10th	Day	15% 8% 26% 26% 16% 10%	490
	11th to 20th	Day	12% 8% 21% 23% 23% 12%	490
	21st to end	Day	11% 8% 28% 24% 18% 11%	490
July	1st to 10th	Day	11% 5% 15% 28% 26% 15%	485
	11th to 20th	Day	10% 5% 13% 27% 25% 20%	484
	21st to end	Day	10% 4 14% 27% 27% 18%	532
August	1st to 10th	Day	18% 5% 17% 27% 17% 16%	486
	11th to 20th	Day	12% 5% 16% 29% 23% 15%	479
	21st to end	Day	15% 3 15% 27% 25% 15%	539
September	1st to 10th	Day	13% 4 16% 30% 26% 11%	490
	11th to 20th	Day	22% 6% 15% 25% 24% 8%	490
	21st to end	Day	23% 7% 19% 30% 18% 4	490
October	1st to 10th	Day	22% 9% 19% 25% 18% 7%	490
	11th to 20th	Day	13% 18% 25% 27% 14% 3	490
	21st to end	Day	19% 16% 24% 29% 10% 3	539
November	1st to 10th	Day	21% 15% 32% 21% 10% 2	390
	11th to 20th	Day	19% 25% 35% 16% 4	270
	21st to end	Day	17% 27% 37% 12% 7% 1	270
December	1st to 10th	Day	26% 29% 34% 9% 2	270
	11th to 20th	Day	19% 27% 36% 14% 3 1	270
	21st to end	Day	25% 22% 39% 9% 4 1	297
January	1st to 10th	Night	17% 28% 30% 20% 5% 1	760
	11th to 20th	Night	20% 22% 33% 20% 5%	760
	21st to end	Night	18% 26% 32% 21% 3	836
February	1st to 10th	Night	14% 24% 33% 25% 4	760
	11th to 20th	Night	23% 26% 32% 17% 2	743
	21st to end	Night	19% 29% 31% 18% 2	628
March	1st to 10th	Night	16% 26% 31% 22% 5%	760
	11th to 20th	Night	20% 22% 30% 21% 7% 1	760
	21st to end	Night	20% 22% 31% 19% 8%	836
April	1st to 10th	Night	17% 24% 30% 21% 7% 1	760
	11th to 20th	Night	18% 18% 27% 24% 11% 2	641
	21st to end	Night	11% 16% 28% 30% 13% 1	570
May	1st to 10th	Night	13% 14% 29% 27% 15% 2	570
	11th to 20th	Night	16% 9% 22% 31% 20% 3	561
	21st to end	Night	14% 4 15% 28% 31% 8%	617
June	1st to 10th	Night	11% 2 18% 36% 28% 6%	570
	11th to 20th	Night	10% 4 14% 27% 34% 11%	570
	21st to end	Night	7% 3 15% 32% 35% 8%	570
July	1st to 10th	Night	12% 2 8% 23% 47% 8%	555
	11th to 20th	Night	11% 2 8% 24% 43% 13%	552
	21st to end	Night	8% 2 8% 28% 41% 13%	624
August	1st to 10th	Night	11% 2 9% 30% 38% 10%	567
	11th to 20th	Night	13% 3 10% 28% 37% 8%	564
	21st to end	Night	15% 2 9% 22% 41% 10%	669
September	1st to 10th	Night	15% 5% 10% 28% 34% 8%	760
	11th to 20th	Night	24% 5% 9% 27% 30% 6%	760
	21st to end	Night	21% 6% 13% 32% 25% 3	760
October	1st to 10th	Night	19% 9% 17% 24% 23% 7%	760
	11th to 20th	Night	19% 11% 24% 26% 17% 3	760
	21st to end	Night	15% 15% 20% 33% 14% 3	836
November	1st to 10th	Night	17% 12% 20% 29% 18% 3	779
	11th to 20th	Night	16% 19% 20% 32% 11% 2	760
	21st to end	Night	17% 17% 23% 30% 12% 1	760
December	1st to 10th	Night	18% 21% 26% 28% 7%	760
	11th to 20th	Night	16% 18% 29% 30% 7% 1	760
	21st to end	Night	22% 19% 28% 27% 4	836

Page generated at 2024-11-07 06:55:48. Version ac07

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