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 2024-03-08.

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	18% 8% 4 7% 6% 3 4 4 5% 6% 33%	78533
	Night	21% 9% 4 7% 6% 3 4 4 4 5% 32%	81062
Transparency	Day	52% 7% 11% 16% 11% 3	78237
	Night	53% 7% 11% 16% 10% 3	80879
Seeing	Day	19% 9% 19% 25% 21% 7%	13734
	Night	22% 7% 18% 32% 20% 2	22864

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	35% 14% 6% 13% 9% 4 4 3 3 3 7%	2539
	11th to 20th	Day	39% 12% 5% 9% 8% 3 4 3 2 3 12%	2540
	21st to end	Day	28% 11% 4 11% 10% 5% 5% 4 5% 4 13%	3114
February	1st to 10th	Day	26% 12% 5% 7% 8% 4 6% 4 5% 6% 15%	1710
	11th to 20th	Day	26% 12% 5% 9% 8% 4 5% 4 5% 5% 17%	1665
	21st to end	Day	26% 13% 6% 9% 7% 4 3 5% 3 5% 18%	1484
March	1st to 10th	Day	23% 11% 5% 8% 8% 4 6% 6% 7% 5% 16%	1978
	11th to 20th	Day	25% 11% 4 9% 7% 4 5% 4 5% 6% 21%	1980
	21st to end	Day	25% 11% 5% 9% 8% 5% 6% 5% 6% 6% 15%	2212
April	1st to 10th	Day	24% 12% 4 8% 8% 4 5% 4 6% 6% 18%	2160
	11th to 20th	Day	22% 11% 4 7% 6% 4 5% 5% 5% 6% 26%	2129
	21st to end	Day	18% 9% 4 8% 6% 4 5% 6% 5% 8% 27%	2335
May	1st to 10th	Day	15% 8% 3 7% 6% 4 4 5% 5% 7% 36%	2452
	11th to 20th	Day	17% 8% 3 8% 6% 3 5% 5% 5% 7% 32%	2477
	21st to end	Day	20% 8% 3 5% 6% 3 6% 5% 7% 7% 31%	2723
June	1st to 10th	Day	19% 8% 3 7% 5% 3 4 5% 5% 7% 34%	2520
	11th to 20th	Day	16% 6% 4 7% 7% 4 6% 5% 6% 8% 31%	2520
	21st to end	Day	8% 4 2 4 4 3 4 5% 5% 5% 56%	2520
July	1st to 10th	Day	5% 3 1 4 3 2 4 4 4 7% 62%	2520
	11th to 20th	Day	5% 3 1 3 3 2 3 3 4 6% 66%	2520
	21st to end	Day	4 2 1 2 2 1 2 2 3 4 76%	2731
August	1st to 10th	Day	2 2 1 3 3 3 4 4 5% 7% 66%	2328
	11th to 20th	Day	3 4 1 3 3 2 2 3 4 6% 68%	2298
	21st to end	Day	5% 4 2 3 4 3 4 4 5% 8% 59%	2451
September	1st to 10th	Day	6% 3 2 3 3 2 3 3 4 7% 65%	2160
	11th to 20th	Day	10% 7% 3 6% 5% 3 6% 4 5% 7% 45%	2151
	21st to end	Day	15% 5% 2 6% 5% 3 5% 4 5% 5% 45%	1900
October	1st to 10th	Day	16% 6% 3 7% 6% 4 3 4 5% 7% 39%	1800
	11th to 20th	Day	16% 9% 4 8% 7% 4 5% 4 4 7% 30%	1800
	21st to end	Day	21% 12% 4 8% 8% 4 4 3 4 6% 27%	1959
November	1st to 10th	Day	27% 12% 5% 10% 8% 3 5% 5% 4 6% 15%	1575
	11th to 20th	Day	27% 10% 5% 9% 9% 4 5% 5% 4 4 18%	1520
	21st to end	Day	25% 10% 4 9% 8% 4 5% 4 4 5% 20%	1520
December	1st to 10th	Day	25% 11% 5% 9% 8% 3 4 3 5% 5% 22%	1520
	11th to 20th	Day	27% 10% 5% 11% 10% 4 6% 6% 6% 6% 9%	1928
	21st to end	Day	29% 15% 5% 14% 10% 4 5% 4 3 3 6%	2794
January	1st to 10th	Night	31% 17% 7% 10% 7% 4 5% 4 4 3 10%	4406
	11th to 20th	Night	37% 14% 4 7% 5% 3 4 3 4 4 15%	4420
	21st to end	Night	32% 12% 5% 9% 8% 4 4 3 4 4 14%	4552
February	1st to 10th	Night	24% 13% 5% 9% 7% 4 6% 5% 4 7% 17%	2470
	11th to 20th	Night	26% 11% 4 8% 6% 3 4 4 4 5% 25%	2402
	21st to end	Night	25% 13% 4 8% 7% 3 3 4 5% 6% 21%	1970
March	1st to 10th	Night	22% 12% 4 8% 6% 4 5% 5% 5% 6% 24%	2141
	11th to 20th	Night	23% 9% 4 7% 8% 3 5% 5% 6% 8% 24%	1980
	21st to end	Night	25% 11% 6% 8% 8% 3 5% 4 5% 5% 20%	2143
April	1st to 10th	Night	25% 11% 4 8% 6% 3 5% 4 5% 6% 23%	1800
	11th to 20th	Night	19% 9% 3 7% 6% 3 5% 4 5% 7% 32%	1779
	21st to end	Night	20% 8% 4 7% 5% 3 5% 4 6% 6% 31%	1621
May	1st to 10th	Night	13% 7% 3 7% 6% 2 5% 5% 5% 6% 41%	1506
	11th to 20th	Night	14% 7% 3 5% 6% 3 5% 5% 6% 9% 35%	1416
	21st to end	Night	16% 8% 3 6% 6% 3 6% 5% 6% 8% 33%	1552
June	1st to 10th	Night	16% 7% 3 7% 6% 3 5% 5% 5% 7% 37%	1440
	11th to 20th	Night	15% 7% 3 7% 5% 3 4 5% 5% 6% 40%	1440
	21st to end	Night	6% 5% 2 5% 5% 2 3 3 3 5% 60%	1440
July	1st to 10th	Night	5% 3 1 2 3 1 3 3 3 5% 71%	1440
	11th to 20th	Night	3 3 2 2 2 1 3 3 3 5% 71%	1440
	21st to end	Night	2 1 1 1 1 1 2 2 3 4 82%	1583
August	1st to 10th	Night	2 3 1 2 2 1 2 2 5% 8% 72%	1611
	11th to 20th	Night	3 3 1 2 3 2 3 2 3 4 74%	1602
	21st to end	Night	6% 4 1 3 3 2 2 3 4 6% 67%	1903
September	1st to 10th	Night	6% 3 1 2 2 2 3 3 4 6% 68%	1800
	11th to 20th	Night	9% 4 3 5% 5% 3 4 4 5% 6% 52%	1808
	21st to end	Night	10% 5% 2 5% 5% 2 4 4 4 7% 53%	2060
October	1st to 10th	Night	15% 6% 3 6% 5% 2 4 3 4 6% 46%	2160
	11th to 20th	Night	16% 5% 2 5% 5% 3 4 5% 5% 7% 42%	2160
	21st to end	Night	21% 8% 3 6% 5% 3 4 3 4 5% 37%	2395
November	1st to 10th	Night	27% 8% 4 7% 6% 3 4 4 6% 6% 23%	2504
	11th to 20th	Night	29% 9% 4 8% 6% 3 5% 4 5% 5% 22%	2660
	21st to end	Night	23% 8% 4 8% 7% 4 5% 4 4 5% 27%	2660
December	1st to 10th	Night	26% 10% 4 7% 7% 3 5% 4 4 6% 25%	2660
	11th to 20th	Night	27% 11% 5% 9% 8% 4 6% 4 5% 6% 15%	3276
	21st to end	Night	25% 12% 6% 12% 9% 4 5% 5% 5% 4 12%	4862

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	83% 6% 5% 3 1 1	2539
	11th to 20th	Day	78% 5% 5% 8% 2 1	2540
	21st to end	Day	73% 8% 7% 7% 4	3114
February	1st to 10th	Day	68% 8% 10% 9% 4	1710
	11th to 20th	Day	68% 9% 8% 9% 4 1	1674
	21st to end	Day	69% 6% 10% 9% 5% 2	1484
March	1st to 10th	Day	66% 9% 10% 10% 5%	1978
	11th to 20th	Day	65% 6% 10% 12% 6% 1	1980
	21st to end	Day	70% 9% 11% 9% 2	2212
April	1st to 10th	Day	66% 8% 11% 11% 3	2160
	11th to 20th	Day	59% 7% 12% 13% 6% 3	2132
	21st to end	Day	55% 10% 14% 12% 8% 1	2335
May	1st to 10th	Day	47% 7% 15% 20% 10% 1	2452
	11th to 20th	Day	51% 8% 14% 19% 7% 1	2480
	21st to end	Day	50% 11% 16% 18% 4	2724
June	1st to 10th	Day	50% 7% 17% 20% 5%	2520
	11th to 20th	Day	50% 9% 20% 16% 6%	2520
	21st to end	Day	29% 7% 17% 31% 12% 4	2520
July	1st to 10th	Day	22% 6% 15% 27% 23% 7%	2451
	11th to 20th	Day	20% 5% 10% 26% 31% 8%	2445
	21st to end	Day	13% 3 9% 30% 38% 7%	2579
August	1st to 10th	Day	18% 6% 15% 33% 21% 6%	2312
	11th to 20th	Day	18% 4 15% 33% 24% 6%	2298
	21st to end	Day	22% 7% 12% 30% 25% 4	2451
September	1st to 10th	Day	20% 5% 12% 30% 21% 12%	2160
	11th to 20th	Day	37% 7% 13% 20% 15% 7%	2151
	21st to end	Day	39% 7% 12% 20% 16% 5%	1900
October	1st to 10th	Day	45% 7% 11% 18% 16% 4	1800
	11th to 20th	Day	55% 6% 12% 14% 12% 2	1800
	21st to end	Day	59% 6% 9% 12% 13% 1	1959
November	1st to 10th	Day	70% 7% 9% 10% 4	1575
	11th to 20th	Day	69% 7% 8% 8% 6% 2	1520
	21st to end	Day	66% 7% 7% 8% 11% 1	1520
December	1st to 10th	Day	66% 5% 9% 10% 9% 1	1520
	11th to 20th	Day	71% 12% 7% 8% 1	1928
	21st to end	Day	82% 8% 5% 3 2	2794
January	1st to 10th	Night	78% 7% 6% 5% 3 1	4406
	11th to 20th	Night	74% 5% 6% 10% 4 1	4420
	21st to end	Night	73% 7% 7% 8% 5% 1	4552
February	1st to 10th	Night	66% 8% 10% 11% 4 1	2470
	11th to 20th	Night	62% 6% 13% 11% 7% 2	2404
	21st to end	Night	63% 6% 12% 10% 6% 2	1970
March	1st to 10th	Night	61% 8% 10% 15% 6%	2141
	11th to 20th	Night	57% 9% 13% 14% 6% 2	1980
	21st to end	Night	65% 8% 13% 13% 1	2143
April	1st to 10th	Night	61% 8% 12% 13% 6%	1800
	11th to 20th	Night	52% 8% 17% 14% 6% 3	1779
	21st to end	Night	53% 7% 14% 16% 7% 2	1621
May	1st to 10th	Night	42% 8% 15% 24% 8% 3	1506
	11th to 20th	Night	44% 8% 18% 21% 6% 3	1416
	21st to end	Night	45% 12% 17% 20% 5%	1552
June	1st to 10th	Night	45% 7% 17% 25% 5% 1	1440
	11th to 20th	Night	43% 9% 19% 22% 7%	1440
	21st to end	Night	27% 6% 16% 33% 13% 4	1440
July	1st to 10th	Night	18% 6% 14% 29% 24% 8%	1400
	11th to 20th	Night	17% 3 13% 25% 34% 8%	1392
	21st to end	Night	8% 2 11% 34% 35% 10%	1495
August	1st to 10th	Night	13% 5% 16% 38% 22% 6%	1602
	11th to 20th	Night	16% 5% 13% 38% 21% 7%	1602
	21st to end	Night	18% 5% 12% 37% 22% 6%	1903
September	1st to 10th	Night	18% 7% 13% 31% 21% 12%	1800
	11th to 20th	Night	32% 8% 13% 24% 15% 9%	1808
	21st to end	Night	32% 7% 14% 22% 17% 8%	2060
October	1st to 10th	Night	40% 6% 9% 23% 17% 4	2160
	11th to 20th	Night	41% 8% 13% 18% 15% 4	2160
	21st to end	Night	50% 7% 9% 15% 17% 2	2395
November	1st to 10th	Night	59% 10% 10% 14% 7%	2504
	11th to 20th	Night	64% 8% 9% 9% 8% 2	2660
	21st to end	Night	59% 8% 8% 10% 12% 2	2660
December	1st to 10th	Night	61% 7% 10% 11% 10% 1	2660
	11th to 20th	Night	69% 10% 8% 9% 4	3276
	21st to end	Night	73% 10% 9% 6% 2	4862

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% 16% 16% 17% 11% 2	180
	11th to 20th	Day	36% 10% 18% 20% 11% 5%	180
	21st to end	Day	26% 12% 19% 22% 16% 6%	388
February	1st to 10th	Day	32% 12% 18% 17% 16% 5%	370
	11th to 20th	Day	30% 13% 24% 19% 10% 4	365
	21st to end	Day	30% 16% 20% 20% 11% 3	341
March	1st to 10th	Day	28% 14% 22% 22% 11% 2	449
	11th to 20th	Day	28% 12% 20% 21% 16% 3	420
	21st to end	Day	28% 13% 24% 22% 12% 2	462
April	1st to 10th	Day	30% 15% 20% 19% 10% 5%	420
	11th to 20th	Day	26% 16% 23% 20% 9% 7%	412
	21st to end	Day	21% 14% 23% 22% 16% 4	420
May	1st to 10th	Day	17% 10% 21% 27% 19% 6%	423
	11th to 20th	Day	24% 10% 15% 23% 20% 9%	448
	21st to end	Day	14% 7% 19% 26% 25% 9%	485
June	1st to 10th	Day	20% 7% 17% 26% 23% 6%	450
	11th to 20th	Day	16% 9% 22% 28% 21% 4	450
	21st to end	Day	7% 5% 14% 36% 31% 7%	450
July	1st to 10th	Day	6% 4 13% 35% 31% 11%	446
	11th to 20th	Day	4 2 18% 36% 30% 10%	444
	21st to end	Day	3 1 15% 30% 40% 11%	487
August	1st to 10th	Day	3 2 11% 32% 36% 15%	447
	11th to 20th	Day	3 2 8% 34% 37% 16%	437
	21st to end	Day	4 4 17% 35% 31% 9%	495
September	1st to 10th	Day	6% 3 22% 30% 30% 8%	450
	11th to 20th	Day	10% 6% 16% 27% 29% 11%	450
	21st to end	Day	15% 6% 22% 27% 23% 6%	450
October	1st to 10th	Day	17% 7% 21% 24% 21% 10%	450
	11th to 20th	Day	20% 9% 15% 24% 22% 10%	450
	21st to end	Day	26% 11% 25% 19% 11% 7%	474
November	1st to 10th	Day	28% 14% 23% 17% 13% 5%	223
	11th to 20th	Day	23% 16% 19% 17% 17% 8%	180
	21st to end	Day	27% 12% 19% 18% 15% 8%	180
December	1st to 10th	Day	33% 11% 15% 19% 16% 6%	180
	11th to 20th	Day	37% 11% 21% 19% 10% 3	180
	21st to end	Day	35% 16% 17% 17% 12% 4	198
January	1st to 10th	Night	36% 13% 16% 19% 14% 2	760
	11th to 20th	Night	36% 9% 14% 20% 19% 2	760
	21st to end	Night	28% 8% 16% 28% 18% 2	836
February	1st to 10th	Night	28% 10% 18% 25% 17% 2	760
	11th to 20th	Night	31% 8% 19% 25% 16% 1	744
	21st to end	Night	30% 12% 20% 27% 12%	628
March	1st to 10th	Night	26% 11% 21% 27% 14% 1	750
	11th to 20th	Night	24% 9% 21% 30% 16% 1	720
	21st to end	Night	27% 9% 23% 26% 14% 1	792
April	1st to 10th	Night	29% 9% 18% 26% 18% 1	720
	11th to 20th	Night	23% 9% 22% 29% 17% 1	711
	21st to end	Night	23% 5% 21% 32% 18% 1	541
May	1st to 10th	Night	14% 5% 25% 38% 17% 1	426
	11th to 20th	Night	15% 5% 18% 36% 23% 2	354
	21st to end	Night	17% 5% 18% 36% 22% 1	389
June	1st to 10th	Night	18% 4 18% 40% 21%	360
	11th to 20th	Night	15% 4 25% 42% 13% 1	360
	21st to end	Night	8% 1 23% 46% 21%	360
July	1st to 10th	Night	5% 3 10% 56% 25% 1	350
	11th to 20th	Night	5% 2 20% 50% 22% 1	348
	21st to end	Night	3 1 12% 56% 27% 1	401
August	1st to 10th	Night	4 1 10% 44% 36% 5%	537
	11th to 20th	Night	4 1 9% 41% 43% 3	534
	21st to end	Night	7% 2 14% 46% 29% 2	715
September	1st to 10th	Night	7% 2 16% 45% 28% 2	720
	11th to 20th	Night	10% 3 14% 32% 35% 6%	720
	21st to end	Night	11% 5% 15% 38% 28% 3	720
October	1st to 10th	Night	15% 4 19% 32% 26% 3	720
	11th to 20th	Night	18% 6% 13% 32% 25% 5%	720
	21st to end	Night	23% 8% 21% 27% 17% 4	792
November	1st to 10th	Night	29% 8% 17% 29% 15% 1	740
	11th to 20th	Night	32% 10% 20% 24% 13% 1	760
	21st to end	Night	25% 8% 17% 29% 18% 3	760
December	1st to 10th	Night	30% 8% 14% 28% 17% 3	760
	11th to 20th	Night	33% 10% 18% 22% 16% 1	760
	21st to end	Night	35% 10% 20% 22% 11% 1	836

Page generated at 2024-03-05 04:23:58. Version ac07

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