Morganton
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Morganton clear sky chart from 2005-11-06 to 2025-10-04.

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 5% 4 6% 8% 42%	126460
	Night	13% 6% 2 6% 4 4 4 4 5% 7% 44%	122934
Transparency	Day	37% 8% 12% 20% 17% 5%	130132
	Night	37% 7% 11% 20% 19% 6%	127331
Seeing	Day	17% 9% 22% 26% 18% 9%	16383
	Night	16% 7% 22% 32% 20% 3	26417

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	13% 5% 2 4 2 2 2 2 4 5% 58%	4056
	11th to 20th	Day	11% 5% 1 4 3 3 3 3 3 5% 60%	4060
	21st to end	Day	18% 5% 2 5% 3 3 3 3 4 5% 48%	4466
February	1st to 10th	Day	14% 6% 2 5% 4 4 3 4 6% 8% 44%	1814
	11th to 20th	Day	19% 7% 2 5% 3 3 4 3 5% 7% 42%	1948
	21st to end	Day	17% 7% 2 6% 4 4 5% 3 4 6% 43%	1650
March	1st to 10th	Day	20% 7% 2 5% 4 3 3 3 5% 5% 43%	4934
	11th to 20th	Day	9% 5% 2 6% 3 3 3 3 4 6% 54%	4980
	21st to end	Day	15% 6% 3 5% 4 4 4 3 5% 6% 46%	5465
April	1st to 10th	Day	11% 4 2 5% 4 4 4 4 6% 8% 49%	2200
	11th to 20th	Day	14% 5% 2 4 4 3 4 4 6% 7% 47%	2371
	21st to end	Day	12% 6% 2 5% 5% 4 5% 4 6% 7% 45%	2600
May	1st to 10th	Day	10% 7% 3 7% 5% 6% 6% 5% 7% 9% 34%	5862
	11th to 20th	Day	18% 7% 3 8% 5% 5% 5% 4 6% 8% 29%	5861
	21st to end	Day	12% 5% 2 6% 4 5% 5% 4 7% 9% 40%	6433
June	1st to 10th	Day	10% 6% 2 7% 5% 6% 7% 5% 7% 10% 35%	2600
	11th to 20th	Day	7% 5% 2 6% 5% 6% 6% 5% 9% 10% 37%	2600
	21st to end	Day	6% 4 2 6% 6% 6% 6% 6% 8% 12% 39%	2600
July	1st to 10th	Day	7% 5% 2 8% 5% 6% 7% 5% 8% 10% 37%	5900
	11th to 20th	Day	7% 6% 2 8% 7% 7% 7% 6% 9% 13% 29%	5900
	21st to end	Day	10% 7% 3 9% 7% 7% 8% 6% 9% 11% 24%	6424
August	1st to 10th	Day	17% 6% 3 7% 6% 6% 7% 6% 8% 10% 24%	4234
	11th to 20th	Day	10% 5% 2 7% 5% 6% 7% 5% 8% 11% 34%	4174
	21st to end	Day	6% 4 2 6% 4 4 5% 4 7% 9% 49%	4399
September	1st to 10th	Day	10% 6% 2 7% 5% 5% 5% 4 6% 9% 42%	2200
	11th to 20th	Day	16% 7% 2 6% 5% 5% 4 4 5% 8% 39%	2200
	21st to end	Day	19% 6% 2 7% 5% 4 4 4 5% 7% 38%	2200
October	1st to 10th	Day	15% 5% 2 4 3 2 2 2 5% 5% 54%	2042
	11th to 20th	Day	13% 4 2 4 2 2 3 2 4 5% 58%	1900
	21st to end	Day	15% 4 2 5% 3 3 2 2 4 4 58%	2090
November	1st to 10th	Day	14% 5% 1 4 3 2 3 2 5% 5% 55%	1928
	11th to 20th	Day	13% 5% 2 5% 3 3 3 2 5% 7% 54%	1800
	21st to end	Day	14% 4 1 4 3 3 4 3 5% 7% 52%	1800
December	1st to 10th	Day	12% 7% 2 4 3 3 4 3 5% 4 53%	2930
	11th to 20th	Day	16% 6% 2 5% 4 3 4 4 5% 7% 45%	3373
	21st to end	Day	19% 6% 2 4 3 3 3 3 4 7% 45%	4466
January	1st to 10th	Night	12% 5% 1 5% 3 2 3 3 4 5% 58%	5889
	11th to 20th	Night	11% 6% 2 4 3 3 3 3 4 4 57%	5900
	21st to end	Night	16% 7% 2 5% 3 3 4 3 5% 6% 47%	6490
February	1st to 10th	Night	13% 5% 2 5% 5% 4 4 4 6% 6% 45%	2583
	11th to 20th	Night	19% 7% 2 5% 3 3 4 3 4 5% 44%	2338
	21st to end	Night	15% 6% 2 5% 4 5% 4 4 5% 6% 43%	1980
March	1st to 10th	Night	17% 6% 2 6% 4 3 4 3 5% 6% 43%	4918
	11th to 20th	Night	8% 4 1 5% 3 4 4 3 5% 8% 55%	4980
	21st to end	Night	14% 4 2 5% 4 4 4 4 6% 7% 45%	5467
April	1st to 10th	Night	11% 5% 2 5% 4 4 4 3 6% 7% 48%	2200
	11th to 20th	Night	12% 5% 1 5% 3 4 3 3 6% 8% 49%	1992
	21st to end	Night	12% 6% 2 6% 4 4 4 3 5% 7% 49%	1800
May	1st to 10th	Night	12% 7% 3 7% 5% 5% 5% 4 7% 9% 37%	4033
	11th to 20th	Night	18% 8% 3 8% 5% 5% 5% 4 6% 9% 30%	4032
	21st to end	Night	14% 6% 2 8% 4 4 4 3 5% 9% 41%	4421
June	1st to 10th	Night	8% 5% 2 7% 5% 5% 7% 6% 9% 11% 36%	1800
	11th to 20th	Night	10% 6% 2 7% 5% 5% 5% 3 7% 9% 39%	1800
	21st to end	Night	7% 4 2 6% 6% 5% 6% 6% 8% 11% 39%	1800
July	1st to 10th	Night	7% 7% 3 8% 6% 6% 7% 5% 9% 11% 32%	4058
	11th to 20th	Night	9% 7% 3 8% 6% 6% 6% 6% 8% 11% 30%	4057
	21st to end	Night	10% 9% 4 10% 7% 6% 6% 6% 8% 11% 24%	4427
August	1st to 10th	Night	18% 8% 3 9% 5% 5% 5% 5% 8% 8% 27%	2915
	11th to 20th	Night	12% 7% 3 8% 6% 6% 6% 5% 7% 9% 30%	2875
	21st to end	Night	7% 5% 2 7% 4 5% 5% 4 6% 9% 45%	3458
September	1st to 10th	Night	11% 6% 2 7% 4 5% 5% 3 6% 7% 43%	2200
	11th to 20th	Night	17% 6% 2 6% 5% 5% 5% 4 5% 7% 36%	2200
	21st to end	Night	19% 7% 2 6% 5% 4 4 3 5% 5% 40%	2200
October	1st to 10th	Night	17% 5% 2 4 3 3 4 3 5% 5% 50%	2205
	11th to 20th	Night	14% 5% 2 4 3 3 3 3 4 5% 53%	2280
	21st to end	Night	14% 4 1 4 3 3 3 2 3 5% 58%	2508
November	1st to 10th	Night	14% 5% 2 5% 4 3 3 3 3 5% 53%	2366
	11th to 20th	Night	13% 5% 2 3 4 3 3 3 4 6% 53%	2600
	21st to end	Night	13% 4 2 5% 3 3 4 4 6% 7% 50%	2600
December	1st to 10th	Night	12% 6% 2 5% 3 3 3 3 4 5% 52%	4250
	11th to 20th	Night	18% 8% 3 6% 4 4 4 3 4 5% 42%	4822
	21st to end	Night	19% 5% 1 4 3 4 3 3 4 6% 46%	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	30% 3 5% 19% 35% 8%	4057
	11th to 20th	Day	28% 4 5% 17% 36% 10%	4060
	21st to end	Day	38% 4 6% 21% 26% 6%	4466
February	1st to 10th	Day	37% 5% 12% 22% 19% 5%	1814
	11th to 20th	Day	41% 6% 9% 20% 19% 6%	1958
	21st to end	Day	42% 7% 8% 17% 20% 7%	1650
March	1st to 10th	Day	42% 5% 6% 16% 18% 13%	4934
	11th to 20th	Day	30% 5% 7% 16% 23% 18%	4980
	21st to end	Day	38% 5% 8% 24% 19% 5%	5465
April	1st to 10th	Day	31% 7% 11% 23% 22% 5%	2200
	11th to 20th	Day	34% 7% 9% 21% 22% 7%	2371
	21st to end	Day	37% 8% 12% 25% 16% 3	2600
May	1st to 10th	Day	41% 11% 15% 20% 12% 1	5897
	11th to 20th	Day	49% 10% 12% 18% 10% 1	5865
	21st to end	Day	38% 9% 14% 19% 17% 3	6447
June	1st to 10th	Day	39% 11% 18% 21% 9% 1	2600
	11th to 20th	Day	36% 13% 18% 19% 13% 1	2600
	21st to end	Day	34% 14% 17% 19% 15% 1	2600
July	1st to 10th	Day	39% 13% 15% 22% 11% 1	5835
	11th to 20th	Day	42% 14% 24% 15% 4	5831
	21st to end	Day	49% 13% 15% 16% 6% 1	6240
August	1st to 10th	Day	49% 12% 18% 17% 4	4221
	11th to 20th	Day	39% 12% 22% 16% 10% 2	4213
	21st to end	Day	29% 9% 15% 35% 11% 2	4399
September	1st to 10th	Day	37% 10% 14% 20% 17% 3	2200
	11th to 20th	Day	42% 9% 11% 19% 16% 3	2200
	21st to end	Day	45% 7% 11% 17% 16% 4	2200
October	1st to 10th	Day	28% 5% 8% 20% 30% 10%	3367
	11th to 20th	Day	21% 3 6% 20% 26% 23%	3140
	21st to end	Day	27% 4 8% 24% 22% 16%	3428
November	1st to 10th	Day	32% 4 9% 20% 28% 7%	1928
	11th to 20th	Day	31% 5% 8% 23% 26% 8%	1800
	21st to end	Day	32% 4 9% 23% 26% 5%	1800
December	1st to 10th	Day	33% 5% 6% 19% 28% 8%	2930
	11th to 20th	Day	38% 6% 11% 17% 21% 8%	3370
	21st to end	Day	38% 6% 11% 27% 16% 3	4466
January	1st to 10th	Night	27% 4 7% 19% 33% 10%	5889
	11th to 20th	Night	29% 5% 6% 18% 33% 9%	5900
	21st to end	Night	36% 4 7% 19% 24% 9%	6490
February	1st to 10th	Night	37% 6% 11% 22% 19% 4	2583
	11th to 20th	Night	41% 5% 9% 18% 21% 6%	2339
	21st to end	Night	40% 6% 10% 17% 21% 6%	1980
March	1st to 10th	Night	39% 7% 7% 15% 24% 8%	4918
	11th to 20th	Night	26% 4 8% 18% 26% 18%	4980
	21st to end	Night	37% 6% 7% 25% 17% 7%	5467
April	1st to 10th	Night	34% 6% 12% 22% 22% 5%	2200
	11th to 20th	Night	33% 7% 10% 22% 21% 8%	1992
	21st to end	Night	35% 6% 14% 23% 19% 4	1800
May	1st to 10th	Night	42% 9% 15% 23% 11% 1	4060
	11th to 20th	Night	50% 9% 13% 18% 9%	4033
	21st to end	Night	37% 9% 13% 25% 15% 2	4429
June	1st to 10th	Night	37% 14% 17% 20% 11% 1	1800
	11th to 20th	Night	38% 11% 20% 21% 9% 1	1800
	21st to end	Night	33% 13% 19% 18% 14% 3	1800
July	1st to 10th	Night	42% 14% 15% 20% 8% 1	4015
	11th to 20th	Night	45% 15% 23% 14% 3 1	4006
	21st to end	Night	51% 14% 16% 14% 5%	4297
August	1st to 10th	Night	50% 13% 19% 14% 4	2904
	11th to 20th	Night	47% 14% 17% 13% 9% 1	2902
	21st to end	Night	34% 11% 13% 31% 10% 2	3458
September	1st to 10th	Night	38% 10% 14% 19% 15% 4	2200
	11th to 20th	Night	44% 10% 11% 17% 17% 1	2200
	21st to end	Night	45% 7% 12% 16% 16% 3	2200
October	1st to 10th	Night	34% 7% 8% 17% 25% 9%	3660
	11th to 20th	Night	22% 3 7% 23% 28% 17%	3779
	21st to end	Night	26% 4 6% 24% 27% 13%	4120
November	1st to 10th	Night	34% 5% 8% 19% 24% 9%	2366
	11th to 20th	Night	32% 5% 7% 20% 25% 10%	2600
	21st to end	Night	32% 6% 7% 24% 26% 6%	2600
December	1st to 10th	Night	33% 5% 8% 21% 28% 5%	4250
	11th to 20th	Night	45% 5% 8% 15% 19% 8%	4824
	21st to end	Night	37% 7% 13% 22% 19% 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	24% 19% 32% 21% 4	300
	11th to 20th	Day	25% 20% 30% 21% 4	300
	21st to end	Day	21% 21% 36% 18% 4	330
February	1st to 10th	Day	20% 16% 38% 21% 6%	300
	11th to 20th	Day	35% 21% 30% 12% 2	300
	21st to end	Day	29% 19% 35% 13% 4	249
March	1st to 10th	Day	23% 14% 30% 25% 7% 1	499
	11th to 20th	Day	23% 15% 31% 24% 5% 1	500
	21st to end	Day	23% 15% 33% 24% 5%	550
April	1st to 10th	Day	20% 16% 30% 20% 12% 1	500
	11th to 20th	Day	16% 15% 28% 25% 13% 3	492
	21st to end	Day	16% 9% 29% 25% 14% 5%	500
May	1st to 10th	Day	12% 12% 30% 29% 12% 5%	503
	11th to 20th	Day	19% 6% 18% 30% 18% 8%	527
	21st to end	Day	17% 5% 16% 27% 22% 13%	573
June	1st to 10th	Day	11% 5% 17% 34% 23% 11%	530
	11th to 20th	Day	8% 4 15% 32% 25% 17%	530
	21st to end	Day	8% 3 13% 33% 28% 15%	530
July	1st to 10th	Day	8% 2 10% 22% 33% 25%	525
	11th to 20th	Day	6% 2 9% 29% 29% 26%	524
	21st to end	Day	9% 2 9% 27% 30% 24%	576
August	1st to 10th	Day	18% 2 16% 24% 22% 18%	526
	11th to 20th	Day	13% 3 12% 24% 31% 18%	519
	21st to end	Day	11% 2 10% 22% 33% 22%	583
September	1st to 10th	Day	12% 3 12% 27% 30% 18%	530
	11th to 20th	Day	18% 5% 11% 21% 30% 15%	530
	21st to end	Day	22% 4 18% 25% 25% 6%	530
October	1st to 10th	Day	18% 4 15% 28% 25% 10%	502
	11th to 20th	Day	15% 8% 21% 29% 21% 7%	490
	21st to end	Day	18% 7% 19% 32% 19% 5%	539
November	1st to 10th	Day	21% 6% 23% 32% 14% 5%	466
	11th to 20th	Day	16% 13% 36% 24% 9% 3	300
	21st to end	Day	15% 14% 31% 25% 13% 2	300
December	1st to 10th	Day	25% 17% 29% 24% 5%	300
	11th to 20th	Day	19% 11% 31% 30% 8% 1	300
	21st to end	Day	25% 12% 32% 22% 7% 2	330
January	1st to 10th	Night	18% 12% 34% 29% 7%	800
	11th to 20th	Night	18% 11% 34% 32% 5%	800
	21st to end	Night	17% 10% 38% 32% 3	880
February	1st to 10th	Night	17% 9% 33% 38% 4	800
	11th to 20th	Night	23% 11% 37% 26% 2	783
	21st to end	Night	17% 15% 35% 30% 3	660
March	1st to 10th	Night	17% 9% 32% 37% 5%	800
	11th to 20th	Night	17% 11% 35% 29% 8%	800
	21st to end	Night	19% 9% 33% 31% 7%	880
April	1st to 10th	Night	16% 11% 34% 30% 10%	800
	11th to 20th	Night	16% 12% 27% 32% 13% 1	768
	21st to end	Night	14% 7% 23% 39% 17%	600
May	1st to 10th	Night	13% 6% 26% 39% 16% 1	600
	11th to 20th	Night	16% 6% 18% 36% 22% 2	591
	21st to end	Night	15% 4 11% 32% 32% 7%	650
June	1st to 10th	Night	10% 3 12% 37% 33% 5%	600
	11th to 20th	Night	12% 3 11% 30% 35% 10%	600
	21st to end	Night	7% 1 9% 32% 44% 7%	600
July	1st to 10th	Night	10% 2 7% 24% 49% 8%	585
	11th to 20th	Night	9% 2 4 26% 46% 13%	582
	21st to end	Night	7% 3 6% 27% 46% 11%	657
August	1st to 10th	Night	16% 2 7% 25% 42% 7%	597
	11th to 20th	Night	12% 3 6% 31% 38% 10%	594
	21st to end	Night	11% 3 8% 25% 43% 10%	761
September	1st to 10th	Night	12% 2 10% 28% 39% 9%	800
	11th to 20th	Night	19% 2 10% 24% 38% 7%	800
	21st to end	Night	23% 2 14% 31% 28% 3	800
October	1st to 10th	Night	18% 3 15% 29% 27% 8%	773
	11th to 20th	Night	17% 5% 22% 34% 20% 2	760
	21st to end	Night	15% 7% 19% 38% 19% 3	836
November	1st to 10th	Night	16% 6% 20% 41% 16% 3	780
	11th to 20th	Night	14% 7% 27% 39% 12% 1	800
	21st to end	Night	15% 8% 25% 37% 15% 1	800
December	1st to 10th	Night	20% 9% 27% 37% 8%	800
	11th to 20th	Night	18% 7% 30% 37% 8% 1	800
	21st to end	Night	24% 9% 26% 34% 7%	880

Page generated at 2025-10-01 01:39:07. Version ac07

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