Hayesville
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Hayesville clear sky chart from 2005-11-06 to 2026-09-14.

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	13% 7% 3 7% 5% 4 4 3 5% 6% 42%	158516
	Night	16% 8% 3 8% 5% 4 4 3 5% 6% 38%	149964
Transparency	Day	42% 7% 13% 21% 13% 4	153299
	Night	46% 7% 12% 19% 12% 3	146180
Seeing	Day	17% 9% 19% 26% 21% 7%	17023
	Night	21% 7% 18% 32% 20% 2	25900

By Month

Percentage Cloud Cover SW (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	30% 15% 6% 14% 8% 6% 5% 3 4 3 6%	4722
	11th to 20th	Day	21% 7% 3 9% 7% 6% 4 3 5% 6% 29%	4740
	21st to end	Day	19% 9% 3 10% 7% 6% 6% 3 5% 5% 26%	5783
February	1st to 10th	Day	25% 13% 4 10% 7% 6% 6% 4 5% 6% 14%	1890
	11th to 20th	Day	25% 13% 5% 10% 7% 5% 4 3 5% 5% 17%	1845
	21st to end	Day	26% 14% 5% 10% 7% 5% 4 4 3 5% 18%	1636
March	1st to 10th	Day	15% 12% 5% 11% 7% 6% 7% 5% 7% 7% 18%	4883
	11th to 20th	Day	22% 13% 4 9% 6% 5% 4 4 4 5% 25%	5110
	21st to end	Day	19% 12% 4 12% 7% 7% 7% 5% 6% 7% 14%	5694
April	1st to 10th	Day	22% 12% 3 9% 8% 6% 5% 3 6% 7% 19%	2520
	11th to 20th	Day	19% 11% 3 8% 5% 5% 4 4 5% 7% 28%	2489
	21st to end	Day	17% 10% 3 9% 5% 5% 5% 4 6% 8% 28%	2725
May	1st to 10th	Day	11% 6% 2 6% 4 5% 4 3 5% 8% 45%	7997
	11th to 20th	Day	9% 6% 3 7% 5% 5% 5% 4 7% 8% 40%	8160
	21st to end	Day	12% 6% 2 6% 5% 5% 5% 4 7% 8% 40%	8992
June	1st to 10th	Day	17% 9% 2 7% 5% 4 4 4 5% 7% 36%	2940
	11th to 20th	Day	14% 7% 3 7% 6% 5% 6% 4 6% 8% 34%	2940
	21st to end	Day	8% 5% 2 5% 4 4 4 4 5% 6% 53%	2940
July	1st to 10th	Day	3 2 1 2 2 2 2 2 3 5% 75%	8219
	11th to 20th	Day	3 2 1 2 2 2 2 2 3 4 78%	8220
	21st to end	Day	3 2 1 2 2 2 2 2 3 4 77%	8874
August	1st to 10th	Day	2 2 1 3 2 3 3 2 3 5% 72%	7547
	11th to 20th	Day	4 3 2 4 3 3 4 3 6% 8% 60%	7563
	21st to end	Day	5% 5% 1 4 3 3 4 3 5% 8% 57%	7977
September	1st to 10th	Day	6% 4 2 4 3 3 3 2 5% 7% 61%	2520
	11th to 20th	Day	9% 7% 3 7% 4 4 5% 4 5% 7% 45%	2426
	21st to end	Day	15% 5% 2 7% 4 4 5% 3 5% 6% 46%	2110
October	1st to 10th	Day	13% 6% 3 7% 4 4 4 4 5% 6% 46%	3280
	11th to 20th	Day	15% 7% 3 8% 6% 6% 5% 5% 7% 8% 29%	3261
	21st to end	Day	19% 11% 4 10% 7% 6% 5% 3 5% 8% 21%	3510
November	1st to 10th	Day	26% 12% 5% 11% 8% 5% 5% 4 5% 6% 15%	1743
	11th to 20th	Day	26% 12% 5% 11% 9% 5% 5% 3 4 4 16%	1680
	21st to end	Day	24% 11% 4 12% 7% 6% 4 4 4 5% 19%	1680
December	1st to 10th	Day	21% 8% 3 12% 7% 5% 4 3 5% 6% 25%	2700
	11th to 20th	Day	25% 13% 5% 15% 8% 6% 6% 4 5% 5% 7%	3108
	21st to end	Day	30% 17% 5% 15% 8% 5% 5% 3 3 4 6%	4092
January	1st to 10th	Night	28% 15% 6% 12% 6% 6% 5% 4 5% 4 10%	8172
	11th to 20th	Night	21% 9% 3 8% 7% 5% 5% 3 4 5% 31%	8220
	21st to end	Night	21% 10% 4 10% 6% 4 4 3 4 5% 29%	8415
February	1st to 10th	Night	22% 13% 5% 10% 6% 5% 6% 4 5% 6% 17%	2730
	11th to 20th	Night	26% 13% 3 8% 5% 4 4 3 4 5% 24%	2662
	21st to end	Night	24% 13% 4 9% 6% 4 4 4 5% 6% 21%	2170
March	1st to 10th	Night	16% 12% 4 10% 7% 7% 6% 5% 7% 6% 20%	5230
	11th to 20th	Night	18% 11% 4 9% 6% 5% 5% 3 5% 5% 29%	5110
	21st to end	Night	18% 13% 5% 12% 7% 6% 6% 4 6% 7% 16%	5522
April	1st to 10th	Night	22% 11% 3 9% 6% 5% 5% 3 6% 6% 23%	2100
	11th to 20th	Night	17% 10% 3 8% 5% 4 5% 3 5% 7% 32%	2079
	21st to end	Night	18% 9% 3 8% 4 5% 4 4 6% 6% 32%	1891
May	1st to 10th	Night	13% 5% 2 6% 4 3 4 3 5% 7% 49%	4929
	11th to 20th	Night	11% 8% 3 7% 5% 4 4 3 5% 7% 43%	4700
	21st to end	Night	10% 7% 2 6% 4 4 5% 4 7% 8% 43%	5181
June	1st to 10th	Night	15% 7% 3 7% 5% 4 5% 4 5% 6% 39%	1680
	11th to 20th	Night	13% 7% 2 7% 5% 5% 3 4 5% 7% 43%	1680
	21st to end	Night	7% 5% 2 6% 4 3 3 2 4 6% 58%	1680
July	1st to 10th	Night	3 2 1 2 2 2 2 2 3 5% 76%	4740
	11th to 20th	Night	2 2 1 2 2 2 2 2 3 3 80%	4740
	21st to end	Night	2 2 1 2 2 2 2 2 3 5% 77%	5187
August	1st to 10th	Night	2 3 1 3 2 2 3 2 4 5% 72%	5275
	11th to 20th	Night	7% 4 2 4 3 3 4 3 4 6% 60%	5292
	21st to end	Night	6% 4 2 4 3 3 3 3 4 6% 64%	6258
September	1st to 10th	Night	6% 4 1 4 2 2 3 3 4 6% 64%	2100
	11th to 20th	Night	9% 5% 2 6% 4 4 4 3 5% 6% 51%	2040
	21st to end	Night	9% 5% 2 5% 4 3 4 3 4 7% 54%	2290
October	1st to 10th	Night	11% 5% 2 6% 4 3 4 3 5% 6% 49%	3920
	11th to 20th	Night	14% 6% 2 6% 5% 5% 5% 4 6% 8% 39%	3897
	21st to end	Night	19% 9% 3 9% 6% 5% 5% 4 6% 6% 28%	4297
November	1st to 10th	Night	26% 9% 3 9% 5% 4 5% 3 6% 6% 22%	2775
	11th to 20th	Night	30% 10% 4 10% 5% 4 4 3 4 4 20%	2940
	21st to end	Night	22% 10% 3 11% 6% 5% 5% 3 4 5% 25%	2940
December	1st to 10th	Night	18% 8% 3 8% 7% 5% 5% 4 6% 6% 29%	4700
	11th to 20th	Night	30% 14% 5% 12% 7% 6% 5% 3 4 5% 10%	5316
	21st to end	Night	27% 12% 5% 13% 7% 6% 5% 4 5% 5% 11%	7106

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	80% 7% 6% 5% 2	4723
	11th to 20th	Day	54% 6% 8% 13% 13% 6%	4740
	21st to end	Day	58% 6% 6% 12% 15% 2	5783
February	1st to 10th	Day	68% 8% 10% 9% 4	1890
	11th to 20th	Day	68% 9% 8% 9% 5% 1	1854
	21st to end	Day	69% 7% 9% 9% 6% 2	1636
March	1st to 10th	Day	60% 9% 12% 15% 4	4883
	11th to 20th	Day	60% 6% 9% 17% 7% 1	5110
	21st to end	Day	65% 11% 13% 8% 3	5694
April	1st to 10th	Day	64% 8% 12% 13% 3	2520
	11th to 20th	Day	56% 8% 12% 14% 8% 2	2492
	21st to end	Day	53% 10% 14% 14% 8% 1	2725
May	1st to 10th	Day	35% 7% 13% 30% 15%	7997
	11th to 20th	Day	36% 10% 21% 25% 7% 1	8163
	21st to end	Day	37% 12% 24% 23% 6%	8994
June	1st to 10th	Day	47% 7% 16% 21% 8% 1	2940
	11th to 20th	Day	46% 8% 18% 19% 8% 1	2940
	21st to end	Day	30% 7% 16% 31% 12% 3	2940
July	1st to 10th	Day	12% 4 13% 35% 18% 18%	8151
	11th to 20th	Day	12% 3 6% 19% 40% 20%	8145
	21st to end	Day	12% 4 15% 37% 28% 4	8675
August	1st to 10th	Day	12% 4 8% 28% 30% 18%	5976
	11th to 20th	Day	20% 7% 19% 35% 16% 3	5962
	21st to end	Day	22% 6% 15% 32% 19% 5%	6256
September	1st to 10th	Day	22% 5% 13% 29% 19% 11%	2520
	11th to 20th	Day	37% 8% 14% 21% 15% 6%	2426
	21st to end	Day	38% 7% 13% 21% 16% 5%	2110
October	1st to 10th	Day	37% 7% 8% 22% 23% 3	3280
	11th to 20th	Day	49% 9% 15% 15% 11% 1	3261
	21st to end	Day	58% 7% 9% 16% 9% 1	3510
November	1st to 10th	Day	70% 7% 9% 10% 4	1743
	11th to 20th	Day	71% 8% 8% 8% 5% 2	1680
	21st to end	Day	66% 8% 8% 8% 10% 1	1680
December	1st to 10th	Day	58% 6% 10% 14% 11% 1	2700
	11th to 20th	Day	75% 10% 7% 6% 1	3108
	21st to end	Day	81% 8% 6% 4 2	4092
January	1st to 10th	Night	75% 7% 8% 6% 3 1	8172
	11th to 20th	Night	54% 6% 7% 14% 13% 6%	8220
	21st to end	Night	57% 5% 6% 13% 16% 3	8415
February	1st to 10th	Night	65% 9% 10% 11% 5% 1	2730
	11th to 20th	Night	62% 6% 12% 11% 7% 2	2664
	21st to end	Night	62% 7% 12% 10% 6% 2	2170
March	1st to 10th	Night	60% 9% 12% 14% 5%	5230
	11th to 20th	Night	55% 10% 10% 16% 8% 1	5110
	21st to end	Night	64% 11% 15% 10% 1	5522
April	1st to 10th	Night	60% 8% 13% 13% 5%	2100
	11th to 20th	Night	51% 8% 16% 16% 7% 3	2079
	21st to end	Night	50% 8% 14% 18% 8% 2	1891
May	1st to 10th	Night	33% 7% 12% 36% 12% 1	4927
	11th to 20th	Night	37% 8% 18% 29% 7% 1	4700
	21st to end	Night	34% 12% 27% 24% 4	5182
June	1st to 10th	Night	43% 7% 16% 27% 6% 1	1680
	11th to 20th	Night	38% 9% 17% 26% 9% 1	1680
	21st to end	Night	27% 6% 16% 33% 13% 4	1680
July	1st to 10th	Night	11% 5% 12% 35% 21% 17%	4700
	11th to 20th	Night	12% 2 9% 17% 42% 18%	4692
	21st to end	Night	12% 3 19% 36% 26% 4	5074
August	1st to 10th	Night	9% 3 8% 32% 34% 14%	4169
	11th to 20th	Night	20% 7% 20% 38% 12% 3	4169
	21st to end	Night	19% 6% 17% 36% 18% 5%	4903
September	1st to 10th	Night	20% 7% 14% 29% 20% 11%	2100
	11th to 20th	Night	32% 8% 14% 23% 15% 8%	2040
	21st to end	Night	30% 7% 15% 24% 17% 7%	2290
October	1st to 10th	Night	33% 6% 9% 29% 20% 2	3920
	11th to 20th	Night	41% 8% 21% 17% 11% 2	3897
	21st to end	Night	54% 8% 11% 16% 10% 1	4297
November	1st to 10th	Night	60% 10% 10% 14% 6%	2775
	11th to 20th	Night	66% 7% 9% 9% 7% 2	2940
	21st to end	Night	60% 8% 8% 10% 11% 2	2940
December	1st to 10th	Night	51% 9% 10% 19% 12% 1	4700
	11th to 20th	Night	76% 8% 6% 7% 2	5316
	21st to end	Night	72% 11% 10% 6% 2	7106

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	38% 15% 16% 17% 10% 2	220
	11th to 20th	Day	29% 8% 18% 25% 14% 6%	220
	21st to end	Day	23% 12% 19% 23% 15% 7%	452
February	1st to 10th	Day	32% 12% 18% 18% 16% 4	430
	11th to 20th	Day	29% 13% 25% 20% 9% 4	425
	21st to end	Day	30% 16% 19% 21% 12% 3	397
March	1st to 10th	Day	27% 14% 24% 22% 11% 2	540
	11th to 20th	Day	28% 13% 22% 20% 14% 4	540
	21st to end	Day	26% 15% 25% 22% 10% 2	594
April	1st to 10th	Day	27% 14% 20% 20% 12% 6%	540
	11th to 20th	Day	23% 15% 23% 22% 12% 6%	532
	21st to end	Day	20% 13% 23% 21% 17% 5%	540
May	1st to 10th	Day	15% 10% 22% 29% 19% 6%	543
	11th to 20th	Day	20% 13% 15% 24% 19% 8%	568
	21st to end	Day	13% 8% 18% 27% 25% 9%	617
June	1st to 10th	Day	18% 9% 18% 27% 22% 7%	570
	11th to 20th	Day	13% 9% 24% 30% 21% 4	570
	21st to end	Day	7% 5% 15% 36% 30% 7%	570
July	1st to 10th	Day	4 3 14% 36% 32% 11%	566
	11th to 20th	Day	4 2 19% 37% 30% 9%	564
	21st to end	Day	3 1 15% 31% 38% 13%	619
August	1st to 10th	Day	3 3 11% 32% 35% 16%	567
	11th to 20th	Day	3 3 9% 34% 36% 16%	557
	21st to end	Day	5% 4 16% 34% 30% 11%	627
September	1st to 10th	Day	6% 3 20% 29% 33% 9%	570
	11th to 20th	Day	10% 6% 18% 28% 28% 10%	543
	21st to end	Day	14% 6% 22% 28% 23% 7%	530
October	1st to 10th	Day	16% 8% 22% 24% 20% 9%	530
	11th to 20th	Day	18% 11% 17% 24% 21% 9%	530
	21st to end	Day	25% 11% 26% 20% 11% 6%	559
November	1st to 10th	Day	28% 15% 24% 16% 13% 5%	271
	11th to 20th	Day	22% 18% 21% 18% 15% 6%	220
	21st to end	Day	27% 11% 19% 19% 16% 7%	220
December	1st to 10th	Day	33% 12% 14% 19% 15% 9%	220
	11th to 20th	Day	35% 13% 22% 18% 10% 2	220
	21st to end	Day	33% 18% 18% 17% 11% 4	242
January	1st to 10th	Night	36% 13% 16% 20% 13% 2	840
	11th to 20th	Night	32% 9% 15% 23% 19% 2	840
	21st to end	Night	26% 8% 17% 29% 18% 2	924
February	1st to 10th	Night	26% 10% 20% 26% 17% 2	840
	11th to 20th	Night	30% 9% 20% 25% 15% 1	824
	21st to end	Night	30% 12% 19% 28% 11%	692
March	1st to 10th	Night	26% 11% 21% 28% 13% 1	840
	11th to 20th	Night	24% 10% 22% 28% 15% 1	840
	21st to end	Night	26% 11% 25% 25% 13% 1	924
April	1st to 10th	Night	26% 9% 18% 28% 19% 1	840
	11th to 20th	Night	21% 9% 23% 30% 16% 1	831
	21st to end	Night	21% 7% 21% 33% 17% 1	631
May	1st to 10th	Night	15% 4 24% 37% 18% 1	496
	11th to 20th	Night	14% 5% 20% 37% 22% 1	414
	21st to end	Night	16% 7% 17% 38% 22% 1	455
June	1st to 10th	Night	17% 5% 18% 40% 19%	420
	11th to 20th	Night	13% 4 25% 44% 13% 1	420
	21st to end	Night	8% 2 21% 47% 21%	420
July	1st to 10th	Night	5% 3 10% 58% 24%	410
	11th to 20th	Night	4 2 20% 51% 22% 1	408
	21st to end	Night	3 1 13% 55% 28% 1	469
August	1st to 10th	Night	4 1 10% 46% 35% 4	627
	11th to 20th	Night	4 2 9% 42% 41% 2	624
	21st to end	Night	7% 2 14% 46% 28% 2	835
September	1st to 10th	Night	7% 3 16% 44% 29% 2	840
	11th to 20th	Night	10% 3 14% 34% 33% 6%	812
	21st to end	Night	10% 6% 15% 39% 27% 3	800
October	1st to 10th	Night	14% 4 19% 34% 25% 3	800
	11th to 20th	Night	18% 6% 14% 34% 24% 4	800
	21st to end	Night	23% 8% 22% 27% 16% 4	880
November	1st to 10th	Night	29% 8% 18% 29% 15% 1	820
	11th to 20th	Night	33% 11% 19% 23% 13% 1	840
	21st to end	Night	25% 8% 18% 28% 18% 3	840
December	1st to 10th	Night	29% 8% 14% 28% 17% 3	840
	11th to 20th	Night	33% 11% 18% 21% 15% 1	840
	21st to end	Night	35% 11% 21% 22% 11% 1	924

Page generated at 2026-09-11 01:11:56. Version ac07

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