Asheboro
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Asheboro clear sky chart from 2005-11-06 to 2025-07-21.

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% 7% 43%	120436
	Night	14% 6% 2 6% 4 4 4 3 5% 7% 45%	118696
Transparency	Day	38% 6% 11% 20% 18% 6%	124084
	Night	38% 5% 10% 19% 21% 6%	123185
Seeing	Day	17% 12% 26% 24% 16% 6%	16351
	Night	16% 10% 25% 30% 17% 2	26446

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% 6% 2 5% 3 2 3 2 3 4 55%	4056
	11th to 20th	Day	11% 6% 2 5% 3 2 3 2 3 4 59%	4060
	21st to end	Day	14% 8% 3 7% 4 4 4 3 3 4 46%	4466
February	1st to 10th	Day	14% 7% 3 5% 3 4 5% 4 6% 7% 42%	1800
	11th to 20th	Day	21% 7% 2 5% 4 3 3 3 5% 5% 44%	1818
	21st to end	Day	18% 7% 2 6% 5% 4 3 3 4 6% 42%	1767
March	1st to 10th	Day	19% 7% 3 6% 4 3 3 3 5% 6% 41%	4935
	11th to 20th	Day	9% 5% 3 5% 3 4 3 3 5% 7% 54%	4980
	21st to end	Day	16% 6% 2 6% 4 3 4 3 4 5% 47%	5465
April	1st to 10th	Day	10% 4 2 4 4 3 4 3 6% 8% 52%	2269
	11th to 20th	Day	11% 5% 2 6% 4 4 4 3 5% 7% 49%	2374
	21st to end	Day	13% 5% 2 5% 5% 4 4 4 6% 6% 45%	2458
May	1st to 10th	Day	9% 7% 3 8% 5% 5% 6% 5% 8% 11% 33%	5862
	11th to 20th	Day	19% 8% 3 8% 5% 5% 5% 4 7% 8% 29%	5861
	21st to end	Day	12% 5% 2 6% 5% 5% 5% 4 7% 8% 42%	6433
June	1st to 10th	Day	9% 5% 2 7% 6% 5% 5% 5% 8% 9% 39%	2600
	11th to 20th	Day	9% 5% 2 5% 5% 5% 5% 5% 7% 11% 42%	2600
	21st to end	Day	6% 5% 2 5% 6% 7% 6% 5% 7% 10% 41%	2600
July	1st to 10th	Day	7% 6% 2 7% 6% 6% 6% 6% 8% 10% 35%	4250
	11th to 20th	Day	9% 7% 2 7% 5% 6% 6% 6% 9% 11% 32%	4250
	21st to end	Day	12% 8% 3 9% 7% 6% 6% 5% 8% 10% 26%	4466
August	1st to 10th	Day	20% 7% 3 7% 6% 5% 6% 6% 8% 10% 23%	4104
	11th to 20th	Day	8% 5% 3 8% 6% 6% 6% 6% 9% 11% 33%	4012
	21st to end	Day	6% 5% 2 4 4 4 5% 4 6% 10% 51%	4180
September	1st to 10th	Day	9% 5% 1 6% 4 6% 5% 4 5% 9% 45%	2244
	11th to 20th	Day	14% 8% 3 6% 3 4 4 3 6% 8% 40%	2090
	21st to end	Day	20% 7% 2 7% 4 4 4 3 5% 7% 38%	2090
October	1st to 10th	Day	16% 6% 2 5% 3 2 3 2 5% 6% 51%	1909
	11th to 20th	Day	13% 4 1 5% 3 3 3 3 4 4 58%	1900
	21st to end	Day	12% 5% 2 5% 3 3 3 2 4 5% 57%	2090
November	1st to 10th	Day	14% 5% 2 4 3 3 3 3 3 6% 54%	1957
	11th to 20th	Day	14% 5% 1 5% 3 4 3 3 4 5% 53%	1921
	21st to end	Day	13% 5% 2 5% 4 4 4 3 5% 6% 49%	1800
December	1st to 10th	Day	12% 7% 2 5% 3 3 3 3 4 4 54%	2930
	11th to 20th	Day	17% 6% 2 7% 4 4 4 3 5% 5% 43%	3373
	21st to end	Day	18% 6% 2 5% 3 3 4 3 5% 7% 45%	4466
January	1st to 10th	Night	13% 5% 1 5% 3 3 3 2 4 5% 56%	5889
	11th to 20th	Night	12% 6% 2 5% 3 3 3 3 4 4 56%	5900
	21st to end	Night	15% 8% 3 5% 3 3 3 3 4 6% 47%	6490
February	1st to 10th	Night	16% 6% 2 5% 4 3 4 4 5% 6% 46%	2600
	11th to 20th	Night	21% 7% 2 5% 4 4 4 3 4 5% 43%	2463
	21st to end	Night	15% 5% 3 4 3 4 4 3 5% 6% 47%	1861
March	1st to 10th	Night	17% 7% 3 6% 4 4 4 3 4 5% 44%	4918
	11th to 20th	Night	10% 5% 2 5% 4 4 3 3 5% 6% 54%	4980
	21st to end	Night	14% 4 2 6% 4 4 4 3 4 7% 48%	5467
April	1st to 10th	Night	13% 5% 2 5% 3 3 4 3 5% 6% 49%	2130
	11th to 20th	Night	12% 5% 2 5% 4 4 3 3 6% 6% 50%	1975
	21st to end	Night	13% 5% 2 4 5% 4 4 4 5% 7% 47%	1958
May	1st to 10th	Night	13% 7% 2 7% 5% 4 5% 3 6% 9% 39%	4033
	11th to 20th	Night	18% 7% 3 7% 4 4 4 4 5% 9% 34%	4032
	21st to end	Night	15% 5% 2 5% 3 4 4 3 6% 9% 43%	4421
June	1st to 10th	Night	10% 6% 3 5% 5% 5% 5% 5% 7% 11% 39%	1800
	11th to 20th	Night	9% 6% 2 7% 5% 4 5% 5% 6% 10% 40%	1800
	21st to end	Night	8% 5% 2 6% 5% 5% 6% 5% 8% 12% 38%	1800
July	1st to 10th	Night	8% 7% 2 8% 7% 7% 6% 5% 7% 9% 33%	2930
	11th to 20th	Night	12% 8% 3 7% 5% 5% 6% 5% 8% 10% 32%	2930
	21st to end	Night	15% 9% 3 9% 5% 5% 6% 5% 6% 11% 26%	3087
August	1st to 10th	Night	22% 7% 3 7% 6% 7% 6% 5% 7% 9% 22%	2825
	11th to 20th	Night	9% 6% 2 6% 4 5% 5% 5% 8% 12% 38%	2785
	21st to end	Night	5% 4 2 6% 4 4 4 4 6% 9% 51%	3475
September	1st to 10th	Night	10% 6% 2 7% 4 4 5% 4 6% 8% 45%	1931
	11th to 20th	Night	15% 6% 2 5% 4 3 5% 3 6% 7% 43%	2090
	21st to end	Night	19% 7% 2 6% 4 4 4 3 5% 7% 38%	2090
October	1st to 10th	Night	14% 7% 2 5% 3 3 3 2 4 6% 50%	2270
	11th to 20th	Night	14% 5% 2 4 3 3 3 2 4 5% 55%	2280
	21st to end	Night	12% 5% 2 5% 3 3 3 2 3 4 58%	2508
November	1st to 10th	Night	14% 6% 2 5% 3 3 3 2 4 6% 53%	2341
	11th to 20th	Night	13% 5% 2 5% 3 4 4 4 5% 5% 50%	2475
	21st to end	Night	13% 4 2 4 3 3 3 3 6% 6% 52%	2600
December	1st to 10th	Night	13% 7% 2 4 4 3 3 3 4 5% 52%	4250
	11th to 20th	Night	17% 9% 3 7% 4 3 3 3 5% 4 41%	4822
	21st to end	Night	18% 5% 2 5% 3 3 4 3 5% 6% 47%	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	35% 2 5% 20% 32% 6%	4057
	11th to 20th	Day	32% 2 5% 16% 37% 9%	4060
	21st to end	Day	43% 2 5% 20% 22% 7%	4466
February	1st to 10th	Day	39% 5% 10% 21% 19% 5%	1800
	11th to 20th	Day	43% 4 8% 18% 21% 7%	1827
	21st to end	Day	44% 4 9% 16% 21% 6%	1767
March	1st to 10th	Day	44% 3 7% 16% 18% 12%	4935
	11th to 20th	Day	31% 4 7% 16% 25% 17%	4980
	21st to end	Day	41% 4 7% 21% 21% 6%	5465
April	1st to 10th	Day	30% 5% 11% 23% 25% 7%	2269
	11th to 20th	Day	34% 5% 10% 21% 21% 8%	2374
	21st to end	Day	37% 6% 11% 24% 18% 4	2458
May	1st to 10th	Day	42% 9% 17% 20% 11% 1	5897
	11th to 20th	Day	51% 8% 12% 20% 9% 1	5865
	21st to end	Day	38% 7% 13% 20% 19% 3	6447
June	1st to 10th	Day	37% 10% 16% 22% 15% 1	2600
	11th to 20th	Day	34% 9% 17% 23% 15% 2	2600
	21st to end	Day	34% 11% 15% 23% 15% 2	2600
July	1st to 10th	Day	39% 13% 17% 17% 12% 2	4185
	11th to 20th	Day	41% 12% 24% 17% 5% 1	4181
	21st to end	Day	50% 11% 15% 16% 8%	4324
August	1st to 10th	Day	53% 9% 17% 16% 5%	4091
	11th to 20th	Day	40% 11% 20% 19% 9% 1	4051
	21st to end	Day	28% 7% 14% 34% 15% 2	4180
September	1st to 10th	Day	36% 8% 14% 19% 18% 4	2244
	11th to 20th	Day	41% 6% 12% 17% 20% 3	2090
	21st to end	Day	45% 6% 9% 20% 16% 4	2090
October	1st to 10th	Day	33% 4 8% 18% 27% 11%	3169
	11th to 20th	Day	20% 3 6% 20% 24% 27%	3140
	21st to end	Day	25% 3 7% 25% 23% 17%	3428
November	1st to 10th	Day	34% 4 7% 21% 27% 8%	1957
	11th to 20th	Day	33% 5% 7% 21% 27% 7%	1921
	21st to end	Day	36% 3 9% 21% 25% 5%	1800
December	1st to 10th	Day	35% 4 6% 19% 28% 8%	2930
	11th to 20th	Day	43% 4 9% 15% 23% 6%	3370
	21st to end	Day	40% 4 10% 27% 18% 2	4466
January	1st to 10th	Night	32% 3 6% 17% 33% 9%	5889
	11th to 20th	Night	33% 3 5% 16% 35% 8%	5900
	21st to end	Night	40% 3 6% 18% 27% 6%	6490
February	1st to 10th	Night	40% 4 10% 21% 20% 5%	2600
	11th to 20th	Night	44% 4 8% 16% 21% 7%	2465
	21st to end	Night	37% 5% 9% 19% 23% 8%	1861
March	1st to 10th	Night	43% 4 7% 13% 24% 10%	4918
	11th to 20th	Night	31% 4 6% 14% 27% 18%	4980
	21st to end	Night	37% 4 7% 24% 22% 6%	5467
April	1st to 10th	Night	34% 6% 9% 19% 25% 7%	2130
	11th to 20th	Night	34% 5% 10% 22% 22% 8%	1975
	21st to end	Night	36% 7% 11% 23% 18% 4	1958
May	1st to 10th	Night	42% 6% 17% 18% 15% 1	4060
	11th to 20th	Night	46% 8% 14% 17% 14% 1	4033
	21st to end	Night	36% 6% 14% 26% 15% 2	4429
June	1st to 10th	Night	38% 10% 15% 21% 14% 2	1800
	11th to 20th	Night	37% 10% 18% 20% 14% 1	1800
	21st to end	Night	35% 12% 17% 20% 13% 3	1800
July	1st to 10th	Night	44% 11% 15% 14% 14% 2	2885
	11th to 20th	Night	44% 12% 22% 16% 4 1	2876
	21st to end	Night	53% 9% 14% 17% 7%	2988
August	1st to 10th	Night	56% 8% 17% 13% 5%	2814
	11th to 20th	Night	35% 10% 23% 22% 9% 1	2812
	21st to end	Night	29% 8% 12% 28% 20% 2	3475
September	1st to 10th	Night	34% 8% 15% 19% 18% 5%	1931
	11th to 20th	Night	39% 9% 12% 17% 21% 3	2090
	21st to end	Night	45% 7% 11% 16% 16% 5%	2090
October	1st to 10th	Night	39% 4 7% 19% 26% 6%	3790
	11th to 20th	Night	24% 3 6% 20% 28% 19%	3779
	21st to end	Night	26% 3 6% 24% 24% 17%	4120
November	1st to 10th	Night	34% 5% 6% 21% 24% 11%	2341
	11th to 20th	Night	35% 4 7% 17% 26% 11%	2475
	21st to end	Night	33% 4 7% 24% 26% 7%	2600
December	1st to 10th	Night	36% 3 6% 19% 28% 7%	4250
	11th to 20th	Night	47% 4 8% 16% 16% 8%	4824
	21st to end	Night	38% 3 12% 23% 22% 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	25% 28% 31% 13% 2	300
	11th to 20th	Day	27% 25% 33% 12% 4	300
	21st to end	Day	19% 27% 42% 9% 3	330
February	1st to 10th	Day	19% 23% 39% 14% 5%	300
	11th to 20th	Day	38% 22% 32% 8% 1	300
	21st to end	Day	27% 23% 31% 16% 3	366
March	1st to 10th	Day	22% 21% 30% 21% 5%	500
	11th to 20th	Day	18% 23% 39% 14% 5% 1	500
	21st to end	Day	24% 19% 35% 17% 5%	550
April	1st to 10th	Day	21% 20% 32% 17% 8% 1	500
	11th to 20th	Day	16% 17% 31% 23% 10% 2	492
	21st to end	Day	17% 14% 31% 26% 11% 2	500
May	1st to 10th	Day	15% 20% 29% 23% 10% 3	503
	11th to 20th	Day	17% 10% 25% 25% 18% 5%	527
	21st to end	Day	17% 7% 22% 26% 22% 7%	573
June	1st to 10th	Day	10% 6% 24% 33% 21% 6%	530
	11th to 20th	Day	10% 6% 21% 30% 25% 9%	530
	21st to end	Day	9% 4 16% 36% 27% 8%	530
July	1st to 10th	Day	9% 2 12% 33% 31% 13%	525
	11th to 20th	Day	6% 2 15% 29% 35% 14%	524
	21st to end	Day	7% 2 14% 34% 29% 13%	532
August	1st to 10th	Day	14% 4 19% 26% 26% 12%	486
	11th to 20th	Day	10% 2 16% 30% 29% 13%	479
	21st to end	Day	11% 2 14% 29% 28% 17%	539
September	1st to 10th	Day	13% 2 17% 26% 30% 12%	490
	11th to 20th	Day	18% 5% 14% 24% 26% 12%	490
	21st to end	Day	22% 5% 22% 31% 16% 3	490
October	1st to 10th	Day	18% 7% 23% 24% 23% 6%	490
	11th to 20th	Day	13% 10% 27% 26% 20% 5%	490
	21st to end	Day	14% 12% 26% 27% 16% 5%	539
November	1st to 10th	Day	18% 11% 30% 25% 13% 3	495
	11th to 20th	Day	18% 17% 30% 24% 10% 1	421
	21st to end	Day	12% 21% 32% 22% 11% 2	300
December	1st to 10th	Day	23% 21% 38% 14% 4	300
	11th to 20th	Day	22% 15% 32% 22% 9%	300
	21st to end	Day	25% 18% 31% 19% 5% 2	330
January	1st to 10th	Night	22% 19% 32% 22% 5%	800
	11th to 20th	Night	20% 16% 34% 25% 5%	800
	21st to end	Night	19% 15% 37% 26% 3	880
February	1st to 10th	Night	21% 14% 35% 28% 3	800
	11th to 20th	Night	27% 19% 33% 20% 1	783
	21st to end	Night	18% 17% 37% 25% 3	660
March	1st to 10th	Night	18% 17% 35% 27% 4	800
	11th to 20th	Night	20% 17% 33% 23% 7% 1	800
	21st to end	Night	18% 14% 39% 24% 4	880
April	1st to 10th	Night	17% 20% 32% 25% 6%	800
	11th to 20th	Night	15% 15% 33% 26% 10% 1	791
	21st to end	Night	15% 7% 33% 37% 8%	758
May	1st to 10th	Night	14% 12% 31% 34% 9%	600
	11th to 20th	Night	15% 5% 25% 34% 19% 1	591
	21st to end	Night	15% 4 15% 37% 27% 2	650
June	1st to 10th	Night	12% 4 20% 37% 25% 3	600
	11th to 20th	Night	12% 3 17% 35% 30% 4	600
	21st to end	Night	9% 2 14% 39% 34% 2	600
July	1st to 10th	Night	10% 2 12% 32% 39% 5%	585
	11th to 20th	Night	8% 1 9% 36% 40% 6%	582
	21st to end	Night	8% 2 12% 37% 37% 5%	624
August	1st to 10th	Night	14% 1 10% 35% 33% 6%	567
	11th to 20th	Night	11% 3 9% 35% 36% 6%	564
	21st to end	Night	11% 2 11% 30% 40% 7%	835
September	1st to 10th	Night	11% 1 13% 33% 34% 7%	760
	11th to 20th	Night	18% 3 13% 28% 34% 5%	760
	21st to end	Night	20% 5% 17% 33% 22% 2	760
October	1st to 10th	Night	17% 5% 18% 29% 25% 6%	760
	11th to 20th	Night	17% 8% 23% 33% 18% 2	760
	21st to end	Night	14% 10% 24% 31% 19% 2	836
November	1st to 10th	Night	16% 8% 25% 33% 16% 2	780
	11th to 20th	Night	15% 14% 28% 32% 11%	800
	21st to end	Night	15% 11% 29% 31% 12% 1	800
December	1st to 10th	Night	22% 13% 30% 30% 6%	800
	11th to 20th	Night	20% 10% 32% 30% 8%	800
	21st to end	Night	24% 14% 24% 31% 7%	880

Page generated at 2025-07-18 01:10:03. Version ac07

Copyright © 2025 Attilla Danko.