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 2024-11-02.

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% 4 4 3 5% 6% 38%	101542
	Night	18% 9% 3 8% 5% 4 4 3 5% 5% 36%	97602
Transparency	Day	46% 7% 12% 17% 13% 5%	101286
	Night	49% 8% 12% 17% 11% 4	97447
Seeing	Day	18% 9% 19% 25% 21% 7%	14686
	Night	21% 7% 18% 32% 20% 2	23604

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	34% 15% 6% 14% 8% 4 4 2 3 3 7%	2539
	11th to 20th	Day	39% 13% 4 10% 6% 4 4 2 2 3 12%	2540
	21st to end	Day	28% 12% 4 13% 8% 6% 5% 3 4 4 13%	3114
February	1st to 10th	Day	26% 13% 4 9% 7% 6% 6% 3 5% 6% 14%	1710
	11th to 20th	Day	26% 13% 4 10% 7% 6% 4 3 5% 5% 17%	1665
	21st to end	Day	25% 14% 5% 10% 6% 5% 4 4 3 5% 18%	1484
March	1st to 10th	Day	17% 13% 5% 11% 7% 7% 7% 5% 6% 6% 16%	3319
	11th to 20th	Day	17% 10% 3 8% 6% 5% 4 3 4 6% 35%	3490
	21st to end	Day	21% 12% 4 11% 7% 7% 6% 4 6% 6% 17%	3884
April	1st to 10th	Day	23% 13% 4 9% 8% 6% 5% 3 5% 6% 18%	2280
	11th to 20th	Day	20% 12% 3 8% 5% 5% 4 4 5% 6% 26%	2249
	21st to end	Day	18% 11% 3 9% 5% 5% 5% 4 6% 8% 26%	2465
May	1st to 10th	Day	20% 8% 3 7% 5% 5% 4 4 5% 6% 34%	4313
	11th to 20th	Day	10% 5% 2 5% 3 3 3 3 5% 7% 52%	4377
	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	16% 7% 3 8% 5% 4 3 4 5% 7% 39%	1900
	11th to 20th	Day	16% 9% 4 10% 6% 5% 5% 4 5% 7% 30%	1900
	21st to end	Day	20% 12% 4 10% 6% 5% 4 2 4 6% 26%	2067
November	1st to 10th	Day	27% 13% 5% 11% 7% 5% 4 4 4 5% 15%	1584
	11th to 20th	Day	27% 11% 4 11% 8% 5% 5% 4 5% 4 17%	1520
	21st to end	Day	25% 11% 4 11% 7% 6% 4 4 4 5% 20%	1520
December	1st to 10th	Day	25% 12% 5% 11% 7% 4 4 3 4 5% 21%	1520
	11th to 20th	Day	27% 11% 4 12% 8% 6% 6% 5% 6% 6% 9%	1928
	21st to end	Day	29% 16% 5% 16% 8% 5% 5% 3 4 3 6%	2794
January	1st to 10th	Night	31% 17% 7% 11% 5% 5% 4 3 4 3 10%	4406
	11th to 20th	Night	37% 15% 4 8% 5% 4 4 2 4 4 15%	4420
	21st to end	Night	32% 13% 5% 10% 7% 5% 4 3 4 4 14%	4552
February	1st to 10th	Night	24% 14% 4 10% 5% 5% 5% 4 5% 6% 17%	2470
	11th to 20th	Night	26% 12% 3 8% 5% 4 4 3 4 5% 25%	2402
	21st to end	Night	24% 14% 4 9% 6% 4 3 3 5% 6% 21%	1970
March	1st to 10th	Night	16% 14% 4 10% 7% 7% 6% 5% 5% 6% 20%	3554
	11th to 20th	Night	15% 8% 2 7% 5% 4 5% 3 5% 6% 40%	3490
	21st to end	Night	20% 13% 5% 11% 7% 6% 6% 4 5% 5% 18%	3768
April	1st to 10th	Night	24% 12% 3 9% 6% 5% 4 3 6% 6% 23%	1900
	11th to 20th	Night	18% 10% 3 7% 5% 4 5% 3 5% 7% 32%	1879
	21st to end	Night	20% 9% 3 8% 4 5% 4 4 6% 6% 31%	1711
May	1st to 10th	Night	19% 8% 3 7% 5% 4 4 3 4 5% 38%	2648
	11th to 20th	Night	8% 5% 2 4 4 3 3 3 5% 7% 56%	2516
	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	14% 6% 3 6% 5% 3 3 3 5% 6% 46%	2280
	11th to 20th	Night	16% 6% 2 6% 5% 5% 4 4 5% 7% 41%	2280
	21st to end	Night	21% 9% 3 8% 4 3 4 3 5% 5% 36%	2529
November	1st to 10th	Night	27% 9% 3 8% 5% 4 5% 3 6% 6% 23%	2517
	11th to 20th	Night	29% 10% 3 10% 5% 4 5% 3 5% 5% 22%	2660
	21st to end	Night	22% 10% 3 10% 6% 5% 4 3 4 5% 27%	2660
December	1st to 10th	Night	25% 11% 4 8% 6% 4 4 3 5% 5% 24%	2660
	11th to 20th	Night	27% 12% 4 10% 7% 5% 5% 4 5% 6% 15%	3276
	21st to end	Night	24% 13% 6% 14% 8% 6% 4 3 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	64% 9% 11% 13% 3	3319
	11th to 20th	Day	49% 7% 11% 22% 10% 1	3490
	21st to end	Day	65% 11% 12% 8% 4	3884
April	1st to 10th	Day	65% 8% 11% 12% 3	2280
	11th to 20th	Day	58% 8% 12% 13% 7% 3	2252
	21st to end	Day	55% 10% 14% 12% 8% 1	2465
May	1st to 10th	Day	49% 9% 12% 18% 12%	4313
	11th to 20th	Day	31% 6% 19% 31% 12% 1	4380
	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	44% 7% 11% 18% 17% 4	1900
	11th to 20th	Day	54% 7% 12% 14% 12% 2	1900
	21st to end	Day	59% 6% 9% 12% 12% 1	2067
November	1st to 10th	Day	71% 7% 9% 10% 4	1584
	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	62% 9% 11% 14% 4	3554
	11th to 20th	Night	42% 11% 13% 21% 12% 1	3490
	21st to end	Night	65% 11% 13% 11% 1	3768
April	1st to 10th	Night	61% 8% 12% 13% 6%	1900
	11th to 20th	Night	51% 8% 17% 15% 7% 3	1879
	21st to end	Night	52% 8% 14% 17% 7% 2	1711
May	1st to 10th	Night	45% 10% 12% 22% 10% 2	2648
	11th to 20th	Night	27% 6% 17% 36% 12% 2	2516
	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	39% 6% 9% 24% 18% 4	2280
	11th to 20th	Night	42% 9% 14% 18% 15% 3	2280
	21st to end	Night	51% 7% 9% 15% 16% 2	2529
November	1st to 10th	Night	59% 10% 10% 14% 7%	2517
	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% 3	460
	11th to 20th	Day	26% 12% 20% 21% 17% 4	460
	21st to end	Day	27% 15% 24% 22% 11% 2	506
April	1st to 10th	Day	28% 15% 22% 18% 12% 5%	460
	11th to 20th	Day	25% 16% 24% 21% 9% 6%	452
	21st to end	Day	22% 14% 23% 22% 16% 4	460
May	1st to 10th	Day	17% 11% 22% 26% 18% 6%	463
	11th to 20th	Day	22% 9% 15% 24% 20% 10%	488
	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% 20% 11% 7%	516
November	1st to 10th	Day	29% 14% 23% 17% 12% 5%	226
	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	760
	11th to 20th	Night	24% 9% 21% 29% 16% 1	760
	21st to end	Night	26% 10% 25% 25% 13% 1	836
April	1st to 10th	Night	28% 9% 18% 26% 19% 1	760
	11th to 20th	Night	22% 9% 23% 29% 17% 1	751
	21st to end	Night	22% 6% 22% 32% 17% 1	571
May	1st to 10th	Night	16% 5% 25% 37% 17% 1	449
	11th to 20th	Night	14% 5% 18% 37% 23% 2	374
	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% 27% 16% 4	836
November	1st to 10th	Night	30% 8% 17% 29% 15% 1	744
	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 2024-10-29 22:22:56. Version ac07

Copyright © 2024 Attilla Danko.