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 2025-05-11.

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	16% 8% 3 8% 5% 5% 4 3 5% 6% 36%	118033
	Night	18% 9% 3 8% 5% 4 4 3 5% 5% 34%	119737
Transparency	Day	47% 7% 11% 17% 12% 4	117777
	Night	50% 8% 12% 17% 11% 3	119582
Seeing	Day	18% 9% 19% 25% 21% 7%	15254
	Night	21% 7% 18% 32% 20% 2	24338

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	33% 15% 5% 13% 7% 5% 4 3 4 3 8%	3639
	11th to 20th	Day	27% 9% 3 10% 8% 6% 5% 3 4 5% 19%	3640
	21st to end	Day	21% 9% 3 10% 7% 6% 5% 3 5% 5% 27%	4464
February	1st to 10th	Day	25% 14% 4 10% 7% 6% 6% 4 5% 7% 14%	1800
	11th to 20th	Day	26% 13% 5% 10% 7% 6% 4 3 5% 5% 17%	1755
	21st to end	Day	25% 14% 5% 10% 6% 5% 4 4 3 5% 18%	1560
March	1st to 10th	Day	15% 12% 5% 11% 7% 6% 7% 5% 7% 7% 18%	4777
	11th to 20th	Day	22% 13% 3 9% 6% 5% 4 4 4 5% 25%	5000
	21st to end	Day	19% 12% 4 12% 7% 7% 7% 5% 6% 7% 14%	5571
April	1st to 10th	Day	23% 13% 4 9% 8% 6% 5% 3 5% 6% 18%	2400
	11th to 20th	Day	19% 12% 3 8% 5% 5% 4 4 5% 6% 28%	2369
	21st to end	Day	17% 10% 3 9% 5% 5% 5% 4 6% 8% 27%	2595
May	1st to 10th	Day	19% 8% 3 7% 5% 5% 4 4 5% 6% 35%	4450
	11th to 20th	Day	10% 5% 2 5% 3 3 3 3 5% 7% 52%	4380
	21st to end	Day	17% 8% 3 8% 6% 6% 6% 5% 7% 7% 29%	4813
June	1st to 10th	Day	19% 9% 2 7% 5% 4 4 4 5% 6% 35%	2660
	11th to 20th	Day	16% 7% 3 8% 6% 5% 6% 4 6% 8% 31%	2660
	21st to end	Day	8% 5% 2 5% 4 4 4 4 5% 6% 55%	2660
July	1st to 10th	Day	3 2 1 2 2 2 2 2 3 5% 75%	4420
	11th to 20th	Day	3 2 1 3 2 2 2 2 3 4 76%	4420
	21st to end	Day	4 2 1 2 2 2 2 2 3 4 77%	4768
August	1st to 10th	Day	2 2 1 3 2 3 3 2 4 6% 70%	4091
	11th to 20th	Day	4 4 2 5% 3 4 4 3 6% 7% 59%	4026
	21st to end	Day	6% 6% 1 4 3 3 4 3 5% 7% 57%	4307
September	1st to 10th	Day	5% 3 1 4 2 2 3 2 5% 7% 64%	2280
	11th to 20th	Day	9% 7% 3 7% 4 4 5% 4 5% 7% 44%	2270
	21st to end	Day	14% 5% 2 7% 4 4 5% 3 5% 6% 45%	2005
October	1st to 10th	Day	13% 5% 3 7% 4 4 4 4 5% 6% 46%	3180
	11th to 20th	Day	15% 7% 3 8% 6% 6% 5% 5% 7% 8% 29%	3161
	21st to end	Day	19% 11% 4 10% 7% 6% 5% 3 5% 8% 22%	3401
November	1st to 10th	Day	26% 13% 5% 11% 7% 5% 4 3 5% 6% 15%	1659
	11th to 20th	Day	26% 11% 4 11% 8% 5% 5% 4 4 4 17%	1600
	21st to end	Day	24% 11% 4 12% 7% 6% 4 4 4 5% 19%	1600
December	1st to 10th	Day	20% 8% 3 12% 7% 5% 4 3 5% 6% 26%	2620
	11th to 20th	Day	25% 13% 5% 15% 8% 6% 6% 4 5% 5% 7%	3028
	21st to end	Day	30% 17% 5% 15% 8% 5% 5% 3 3 3 6%	4004
January	1st to 10th	Night	30% 16% 6% 11% 5% 5% 5% 3 5% 3 11%	6306
	11th to 20th	Night	27% 11% 3 8% 7% 5% 5% 3 4 5% 22%	6320
	21st to end	Night	24% 10% 4 8% 5% 4 4 3 4 5% 30%	6499
February	1st to 10th	Night	23% 14% 5% 10% 5% 5% 6% 4 5% 6% 17%	2600
	11th to 20th	Night	26% 12% 3 8% 5% 4 4 3 4 5% 25%	2532
	21st to end	Night	24% 14% 4 9% 6% 4 4 4 5% 6% 21%	2070
March	1st to 10th	Night	16% 12% 4 10% 7% 7% 6% 5% 7% 6% 21%	5116
	11th to 20th	Night	18% 11% 4 9% 6% 5% 5% 3 5% 5% 29%	5000
	21st to end	Night	18% 13% 5% 12% 7% 7% 6% 4 6% 7% 15%	5403
April	1st to 10th	Night	23% 12% 3 10% 6% 5% 4 3 6% 5% 23%	2000
	11th to 20th	Night	17% 10% 3 7% 5% 4 5% 3 5% 7% 34%	1979
	21st to end	Night	19% 9% 3 8% 5% 5% 4 4 6% 6% 31%	1801
May	1st to 10th	Night	19% 7% 3 7% 5% 4 4 3 5% 5% 39%	2731
	11th to 20th	Night	8% 5% 2 4 4 3 3 3 5% 7% 56%	2519
	21st to end	Night	14% 7% 3 6% 5% 5% 5% 4 7% 8% 36%	2762
June	1st to 10th	Night	16% 8% 3 7% 5% 4 5% 3 5% 7% 37%	1520
	11th to 20th	Night	14% 8% 2 8% 4 5% 3 4 5% 6% 41%	1520
	21st to end	Night	6% 5% 2 6% 4 4 3 3 4 6% 60%	1520
July	1st to 10th	Night	3 2 1 2 2 1 2 2 2 4 81%	2540
	11th to 20th	Night	3 3 1 2 2 2 2 2 2 4 78%	2540
	21st to end	Night	3 2 2 1 1 2 1 3 4 80%	2781
August	1st to 10th	Night	1 2 1 3 2 1 2 2 4 6% 76%	2848
	11th to 20th	Night	5% 4 2 4 3 4 4 3 5% 6% 60%	2812
	21st to end	Night	8% 4 2 4 3 2 2 3 3 5% 64%	3365
September	1st to 10th	Night	6% 3 1 3 2 2 3 3 4 6% 67%	1900
	11th to 20th	Night	9% 5% 2 6% 5% 5% 4 3 5% 6% 51%	1909
	21st to end	Night	10% 5% 2 6% 4 3 4 3 5% 7% 53%	2175
October	1st to 10th	Night	11% 5% 2 6% 4 3 4 4 5% 6% 49%	3800
	11th to 20th	Night	14% 6% 2 6% 5% 5% 5% 4 6% 8% 39%	3777
	21st to end	Night	19% 9% 3 9% 5% 5% 5% 4 6% 6% 28%	4164
November	1st to 10th	Night	26% 8% 3 8% 5% 4 5% 3 6% 6% 23%	2640
	11th to 20th	Night	29% 10% 4 10% 5% 4 4 3 5% 4 21%	2800
	21st to end	Night	22% 10% 3 10% 6% 5% 5% 3 5% 5% 26%	2800
December	1st to 10th	Night	17% 8% 3 8% 7% 5% 5% 4 6% 6% 30%	4560
	11th to 20th	Night	30% 14% 5% 12% 7% 6% 5% 3 4 5% 10%	5176
	21st to end	Night	27% 12% 5% 13% 7% 6% 5% 4 5% 5% 11%	6952

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% 6% 6% 6% 2	3639
	11th to 20th	Day	66% 6% 7% 13% 7% 1	3640
	21st to end	Day	58% 7% 7% 11% 15% 3	4464
February	1st to 10th	Day	69% 8% 10% 9% 4	1800
	11th to 20th	Day	68% 9% 8% 9% 5% 2	1764
	21st to end	Day	68% 6% 9% 9% 5% 2	1560
March	1st to 10th	Day	59% 9% 12% 15% 4	4777
	11th to 20th	Day	59% 6% 10% 17% 7% 1	5000
	21st to end	Day	66% 11% 13% 8% 3	5571
April	1st to 10th	Day	65% 8% 11% 12% 3	2400
	11th to 20th	Day	56% 8% 12% 14% 8% 2	2372
	21st to end	Day	54% 10% 14% 13% 8% 1	2595
May	1st to 10th	Day	48% 9% 12% 19% 12%	4450
	11th to 20th	Day	31% 6% 19% 31% 12% 1	4383
	21st to end	Day	48% 15% 19% 15% 3	4814
June	1st to 10th	Day	50% 7% 16% 20% 6% 1	2660
	11th to 20th	Day	49% 9% 19% 17% 6%	2660
	21st to end	Day	29% 7% 17% 31% 12% 4	2660
July	1st to 10th	Day	14% 4 9% 19% 23% 32%	4351
	11th to 20th	Day	13% 3 7% 19% 38% 21%	4345
	21st to end	Day	13% 4 11% 27% 38% 7%	4617
August	1st to 10th	Day	16% 5% 10% 30% 27% 12%	4076
	11th to 20th	Day	23% 7% 19% 32% 16% 3	4065
	21st to end	Day	26% 7% 12% 25% 23% 6%	4306
September	1st to 10th	Day	20% 5% 12% 30% 21% 12%	2280
	11th to 20th	Day	37% 8% 14% 20% 15% 6%	2270
	21st to end	Day	38% 7% 13% 21% 15% 5%	2005
October	1st to 10th	Day	36% 7% 8% 22% 23% 3	3180
	11th to 20th	Day	50% 9% 15% 15% 11% 1	3161
	21st to end	Day	58% 7% 9% 16% 10% 1	3401
November	1st to 10th	Day	70% 7% 9% 10% 4	1659
	11th to 20th	Day	70% 8% 8% 8% 5% 2	1600
	21st to end	Day	66% 7% 8% 8% 10% 1	1600
December	1st to 10th	Day	58% 6% 10% 15% 11% 1	2620
	11th to 20th	Day	75% 10% 7% 6% 1	3028
	21st to end	Day	82% 8% 5% 4 2	4004
January	1st to 10th	Night	75% 7% 7% 6% 4 1	6306
	11th to 20th	Night	63% 7% 7% 15% 7% 1	6320
	21st to end	Night	57% 5% 6% 12% 16% 3	6499
February	1st to 10th	Night	66% 9% 9% 11% 4 1	2600
	11th to 20th	Night	62% 6% 12% 10% 7% 2	2534
	21st to end	Night	63% 6% 12% 10% 6% 2	2070
March	1st to 10th	Night	59% 9% 12% 14% 5%	5116
	11th to 20th	Night	55% 10% 10% 16% 8% 1	5000
	21st to end	Night	64% 11% 15% 10% 1	5403
April	1st to 10th	Night	61% 8% 12% 13% 6%	2000
	11th to 20th	Night	50% 7% 16% 16% 8% 3	1979
	21st to end	Night	52% 8% 14% 17% 7% 2	1801
May	1st to 10th	Night	44% 10% 11% 23% 10% 1	2731
	11th to 20th	Night	27% 6% 17% 36% 12% 2	2519
	21st to end	Night	38% 16% 28% 14% 3	2762
June	1st to 10th	Night	46% 7% 16% 25% 5% 1	1520
	11th to 20th	Night	41% 9% 18% 24% 8%	1520
	21st to end	Night	27% 6% 16% 34% 13% 4	1520
July	1st to 10th	Night	11% 4 8% 21% 26% 30%	2500
	11th to 20th	Night	13% 2 8% 19% 33% 25%	2492
	21st to end	Night	9% 3 12% 30% 37% 8%	2694
August	1st to 10th	Night	11% 4 10% 36% 30% 9%	2839
	11th to 20th	Night	22% 8% 21% 33% 12% 4	2839
	21st to end	Night	23% 6% 14% 28% 23% 6%	3365
September	1st to 10th	Night	17% 7% 13% 30% 21% 12%	1900
	11th to 20th	Night	32% 8% 14% 23% 14% 9%	1909
	21st to end	Night	31% 7% 15% 23% 17% 8%	2175
October	1st to 10th	Night	33% 6% 9% 29% 21% 2	3800
	11th to 20th	Night	42% 8% 21% 17% 10% 2	3777
	21st to end	Night	54% 8% 11% 16% 10% 1	4164
November	1st to 10th	Night	59% 10% 10% 14% 7%	2640
	11th to 20th	Night	66% 8% 9% 9% 7% 2	2800
	21st to end	Night	59% 8% 9% 10% 11% 2	2800
December	1st to 10th	Night	50% 9% 10% 19% 12% 1	4560
	11th to 20th	Night	76% 8% 6% 7% 2	5176
	21st to end	Night	72% 11% 10% 6% 2	6952

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	39% 16% 16% 18% 11% 3	200
	11th to 20th	Day	32% 9% 19% 23% 12% 6%	200
	21st to end	Day	24% 12% 19% 23% 15% 8%	420
February	1st to 10th	Day	32% 13% 18% 18% 15% 5%	400
	11th to 20th	Day	30% 13% 24% 19% 10% 4	395
	21st to end	Day	30% 16% 19% 20% 12% 3	369
March	1st to 10th	Day	27% 14% 23% 23% 11% 2	500
	11th to 20th	Day	27% 13% 20% 20% 16% 4	500
	21st to end	Day	27% 15% 24% 23% 11% 2	550
April	1st to 10th	Day	28% 15% 21% 20% 11% 5%	500
	11th to 20th	Day	23% 15% 23% 22% 11% 6%	492
	21st to end	Day	21% 13% 23% 21% 17% 5%	500
May	1st to 10th	Day	16% 11% 23% 27% 18% 6%	503
	11th to 20th	Day	22% 9% 15% 24% 20% 10%	489
	21st to end	Day	14% 8% 19% 26% 25% 9%	529
June	1st to 10th	Day	20% 8% 17% 27% 23% 6%	490
	11th to 20th	Day	15% 10% 23% 28% 21% 4	490
	21st to end	Day	7% 6% 15% 36% 30% 7%	490
July	1st to 10th	Day	5% 3 15% 36% 31% 10%	486
	11th to 20th	Day	4 2 17% 37% 30% 10%	484
	21st to end	Day	3 1 15% 31% 40% 11%	531
August	1st to 10th	Day	3 2 11% 32% 37% 14%	487
	11th to 20th	Day	3 3 9% 34% 35% 16%	477
	21st to end	Day	5% 4 17% 35% 30% 10%	539
September	1st to 10th	Day	6% 3 21% 29% 33% 9%	490
	11th to 20th	Day	10% 6% 18% 28% 28% 10%	490
	21st to end	Day	14% 6% 23% 27% 23% 7%	490
October	1st to 10th	Day	16% 7% 22% 24% 21% 10%	490
	11th to 20th	Day	19% 9% 17% 25% 21% 10%	490
	21st to end	Day	26% 11% 26% 19% 11% 7%	516
November	1st to 10th	Day	27% 15% 24% 16% 13% 6%	247
	11th to 20th	Day	23% 20% 18% 18% 15% 7%	200
	21st to end	Day	27% 12% 19% 19% 16% 8%	200
December	1st to 10th	Day	32% 10% 14% 19% 16% 10%	200
	11th to 20th	Day	36% 12% 22% 19% 9% 3	200
	21st to end	Day	34% 17% 18% 17% 11% 3	220
January	1st to 10th	Night	36% 13% 16% 20% 13% 2	800
	11th to 20th	Night	34% 9% 15% 22% 19% 2	800
	21st to end	Night	26% 8% 16% 29% 19% 3	880
February	1st to 10th	Night	27% 11% 20% 25% 16% 2	800
	11th to 20th	Night	30% 9% 20% 25% 15% 1	784
	21st to end	Night	30% 12% 19% 27% 12%	660
March	1st to 10th	Night	25% 11% 21% 28% 14% 1	800
	11th to 20th	Night	24% 10% 21% 29% 16% 1	800
	21st to end	Night	26% 11% 24% 25% 13% 1	880
April	1st to 10th	Night	27% 9% 18% 27% 19% 1	800
	11th to 20th	Night	21% 9% 23% 30% 16% 1	791
	21st to end	Night	22% 6% 21% 32% 17% 1	601
May	1st to 10th	Night	16% 4 24% 38% 17% 1	472
	11th to 20th	Night	14% 5% 19% 37% 23% 2	375
	21st to end	Night	17% 7% 17% 36% 22% 1	411
June	1st to 10th	Night	18% 5% 17% 40% 20%	380
	11th to 20th	Night	14% 4 26% 42% 13% 1	380
	21st to end	Night	8% 1 23% 47% 21%	380
July	1st to 10th	Night	5% 3 10% 57% 25% 1	370
	11th to 20th	Night	5% 2 19% 51% 22% 1	368
	21st to end	Night	3 1 13% 55% 27% 1	424
August	1st to 10th	Night	3 1 9% 46% 35% 5%	567
	11th to 20th	Night	4 2 9% 41% 42% 2	564
	21st to end	Night	7% 2 14% 45% 29% 2	755
September	1st to 10th	Night	6% 2 16% 45% 29% 2	760
	11th to 20th	Night	10% 3 14% 34% 33% 6%	760
	21st to end	Night	10% 5% 15% 38% 27% 3	760
October	1st to 10th	Night	14% 4 19% 33% 26% 3	760
	11th to 20th	Night	18% 6% 14% 33% 25% 4	760
	21st to end	Night	23% 8% 22% 26% 17% 4	836
November	1st to 10th	Night	29% 8% 18% 29% 16% 1	780
	11th to 20th	Night	33% 11% 19% 23% 13% 1	800
	21st to end	Night	24% 8% 18% 28% 19% 3	800
December	1st to 10th	Night	29% 8% 15% 28% 18% 4	800
	11th to 20th	Night	34% 11% 18% 22% 15% 1	800
	21st to end	Night	35% 11% 20% 22% 11% 1	880

Page generated at 2025-05-08 06:33:58. Version ac07

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