Ware Shoals Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Ware Shoals Park clear sky chart from 2005-11-06 to 2026-09-29.

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	12% 6% 2 6% 4 4 5% 4 6% 8% 42%	148867
	Night	13% 6% 2 6% 4 4 4 4 6% 8% 43%	142511
Transparency	Day	37% 7% 13% 20% 18% 6%	152565
	Night	38% 6% 11% 18% 20% 7%	146872
Seeing	Day	16% 9% 24% 25% 19% 8%	17697
	Night	16% 8% 23% 30% 20% 3	27701

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	14% 6% 2 5% 4 3 4 3 5% 6% 49%	5258
	11th to 20th	Day	11% 6% 2 4 2 2 2 2 3 3 62%	5280
	21st to end	Day	22% 8% 2 7% 4 4 3 3 4 5% 40%	5780
February	1st to 10th	Day	14% 7% 2 5% 4 4 4 4 5% 7% 43%	1995
	11th to 20th	Day	22% 6% 2 5% 3 3 3 3 5% 5% 43%	2048
	21st to end	Day	19% 7% 2 5% 3 3 4 3 4 6% 42%	1730
March	1st to 10th	Day	20% 7% 3 7% 4 3 3 3 4 5% 40%	5000
	11th to 20th	Day	9% 4 2 6% 4 4 3 4 4 6% 54%	5090
	21st to end	Day	16% 6% 2 6% 4 4 4 3 4 5% 45%	5586
April	1st to 10th	Day	11% 5% 2 6% 4 4 4 4 6% 6% 47%	2310
	11th to 20th	Day	11% 5% 2 5% 4 3 4 3 5% 7% 51%	2448
	21st to end	Day	10% 5% 2 5% 4 3 5% 4 6% 7% 49%	2730
May	1st to 10th	Day	13% 7% 2 7% 5% 5% 5% 4 7% 8% 38%	7616
	11th to 20th	Day	14% 6% 2 7% 4 5% 5% 4 6% 8% 38%	7626
	21st to end	Day	15% 7% 3 7% 5% 5% 5% 4 7% 8% 34%	8391
June	1st to 10th	Day	9% 6% 2 7% 6% 5% 5% 5% 8% 11% 36%	2730
	11th to 20th	Day	6% 4 2 6% 5% 6% 6% 5% 8% 10% 42%	2730
	21st to end	Day	5% 5% 2 6% 5% 5% 6% 5% 9% 13% 40%	2730
July	1st to 10th	Day	5% 5% 2 6% 5% 6% 5% 6% 9% 12% 39%	7680
	11th to 20th	Day	6% 5% 2 6% 5% 5% 6% 6% 9% 13% 36%	7680
	21st to end	Day	8% 6% 3 7% 6% 7% 7% 6% 10% 13% 28%	8340
August	1st to 10th	Day	15% 8% 3 8% 5% 6% 7% 5% 8% 12% 22%	6014
	11th to 20th	Day	8% 4 1 4 3 4 5% 5% 7% 12% 46%	5951
	21st to end	Day	7% 4 3 6% 4 5% 6% 4 6% 9% 46%	5998
September	1st to 10th	Day	8% 5% 2 5% 4 5% 5% 5% 8% 10% 43%	2310
	11th to 20th	Day	12% 6% 3 7% 5% 4 5% 4 6% 7% 41%	2310
	21st to end	Day	16% 6% 2 5% 4 4 4 4 6% 6% 43%	2288
October	1st to 10th	Day	13% 5% 2 4 3 3 3 3 4 6% 53%	2158
	11th to 20th	Day	12% 5% 2 4 2 2 3 2 4 5% 59%	2000
	21st to end	Day	11% 5% 2 5% 4 4 2 2 3 4 58%	2200
November	1st to 10th	Day	15% 5% 2 5% 4 3 3 2 3 5% 53%	2032
	11th to 20th	Day	14% 4 2 4 3 3 3 3 4 7% 53%	1890
	21st to end	Day	13% 5% 2 4 3 3 4 3 5% 6% 50%	1890
December	1st to 10th	Day	16% 7% 2 5% 3 4 2 3 5% 5% 49%	3020
	11th to 20th	Day	17% 7% 2 5% 3 3 4 4 6% 6% 44%	3463
	21st to end	Day	22% 6% 2 5% 2 2 3 2 4 6% 45%	4565
January	1st to 10th	Night	14% 6% 2 5% 3 4 3 2 4 5% 53%	7635
	11th to 20th	Night	11% 6% 2 5% 4 3 4 2 4 5% 54%	7680
	21st to end	Night	19% 8% 2 6% 3 3 3 2 3 5% 46%	8401
February	1st to 10th	Night	14% 6% 3 6% 4 4 4 3 4 6% 46%	2620
	11th to 20th	Night	20% 6% 2 5% 4 4 3 3 3 5% 44%	2458
	21st to end	Night	16% 6% 3 4 4 3 3 3 6% 7% 44%	2076
March	1st to 10th	Night	19% 6% 2 5% 3 3 4 3 5% 7% 42%	5060
	11th to 20th	Night	9% 4 2 4 3 3 4 4 6% 7% 55%	5090
	21st to end	Night	15% 5% 2 5% 4 4 4 3 5% 6% 48%	5588
April	1st to 10th	Night	11% 5% 2 5% 5% 4 4 3 5% 7% 49%	2310
	11th to 20th	Night	10% 5% 2 4 4 4 3 3 4 7% 54%	2136
	21st to end	Night	9% 5% 2 5% 4 4 4 4 5% 6% 52%	1890
May	1st to 10th	Night	13% 7% 3 8% 4 5% 5% 4 6% 10% 35%	5237
	11th to 20th	Night	16% 7% 2 6% 5% 4 5% 4 6% 8% 38%	5234
	21st to end	Night	16% 7% 3 7% 4 5% 5% 4 7% 8% 34%	5761
June	1st to 10th	Night	11% 5% 2 7% 6% 4 5% 4 9% 11% 35%	1890
	11th to 20th	Night	8% 5% 3 6% 5% 5% 5% 5% 8% 12% 39%	1890
	21st to end	Night	7% 5% 2 6% 5% 5% 7% 6% 8% 10% 38%	1890
July	1st to 10th	Night	8% 6% 3 7% 6% 6% 7% 6% 9% 12% 30%	5278
	11th to 20th	Night	8% 5% 2 7% 6% 6% 7% 7% 10% 14% 28%	5277
	21st to end	Night	10% 8% 3 10% 6% 6% 6% 6% 8% 12% 23%	5736
August	1st to 10th	Night	17% 9% 3 8% 6% 6% 7% 6% 9% 12% 18%	4135
	11th to 20th	Night	8% 6% 2 7% 5% 6% 6% 5% 8% 13% 34%	4095
	21st to end	Night	8% 6% 2 6% 5% 5% 5% 4 6% 8% 43%	5048
September	1st to 10th	Night	9% 6% 2 6% 4 5% 5% 4 8% 9% 43%	2310
	11th to 20th	Night	13% 7% 3 7% 5% 4 5% 4 6% 9% 37%	2310
	21st to end	Night	15% 5% 2 5% 4 4 4 4 5% 7% 45%	2289
October	1st to 10th	Night	11% 5% 2 5% 3 3 3 3 5% 5% 54%	2240
	11th to 20th	Night	12% 5% 1 4 3 3 3 3 4 5% 56%	2400
	21st to end	Night	13% 4 1 4 3 3 3 3 4 5% 58%	2640
November	1st to 10th	Night	13% 6% 2 4 3 3 3 2 4 5% 55%	2482
	11th to 20th	Night	15% 5% 1 4 3 3 3 3 3 6% 53%	2730
	21st to end	Night	15% 5% 2 5% 4 3 3 3 5% 6% 50%	2730
December	1st to 10th	Night	15% 6% 2 4 3 3 4 3 4 4 52%	4380
	11th to 20th	Night	17% 7% 2 5% 3 3 3 3 4 6% 46%	4952
	21st to end	Night	21% 5% 2 5% 4 3 4 3 4 5% 44%	6633

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	37% 4 7% 24% 23% 5%	5259
	11th to 20th	Day	29% 3 4 14% 38% 13%	5280
	21st to end	Day	48% 2 5% 14% 19% 11%	5780
February	1st to 10th	Day	40% 4 9% 21% 20% 6%	1995
	11th to 20th	Day	43% 4 5% 19% 22% 5%	2058
	21st to end	Day	43% 4 8% 15% 22% 9%	1730
March	1st to 10th	Day	46% 4 7% 14% 18% 11%	5000
	11th to 20th	Day	31% 4 7% 14% 25% 19%	5090
	21st to end	Day	42% 4 6% 20% 22% 6%	5586
April	1st to 10th	Day	35% 5% 11% 19% 25% 5%	2310
	11th to 20th	Day	33% 5% 9% 20% 23% 10%	2448
	21st to end	Day	32% 6% 12% 26% 21% 4	2730
May	1st to 10th	Day	41% 8% 14% 23% 12% 2	7651
	11th to 20th	Day	41% 8% 15% 21% 13% 2	7630
	21st to end	Day	45% 9% 13% 16% 15% 2	8405
June	1st to 10th	Day	38% 9% 16% 24% 10% 2	2730
	11th to 20th	Day	33% 9% 19% 25% 13% 1	2730
	21st to end	Day	32% 12% 18% 21% 14% 3	2730
July	1st to 10th	Day	32% 12% 23% 26% 6% 1	7615
	11th to 20th	Day	34% 15% 29% 20% 3 1	7611
	21st to end	Day	41% 13% 20% 17% 8% 1	8156
August	1st to 10th	Day	50% 13% 18% 15% 4	6001
	11th to 20th	Day	27% 9% 23% 26% 14% 1	5990
	21st to end	Day	32% 10% 15% 24% 17% 3	5998
September	1st to 10th	Day	34% 9% 14% 21% 19% 3	2310
	11th to 20th	Day	40% 7% 12% 18% 20% 2	2310
	21st to end	Day	40% 6% 12% 19% 17% 6%	2288
October	1st to 10th	Day	28% 4 6% 19% 32% 11%	3509
	11th to 20th	Day	20% 2 5% 15% 30% 27%	3240
	21st to end	Day	26% 3 4 22% 30% 14%	3538
November	1st to 10th	Day	35% 4 7% 18% 27% 10%	2032
	11th to 20th	Day	32% 3 7% 22% 26% 9%	1890
	21st to end	Day	34% 6% 7% 22% 24% 7%	1890
December	1st to 10th	Day	38% 3 6% 17% 28% 9%	3020
	11th to 20th	Day	40% 6% 8% 19% 19% 9%	3460
	21st to end	Day	41% 3 8% 24% 22% 2	4565
January	1st to 10th	Night	35% 3 8% 22% 26% 6%	7636
	11th to 20th	Night	33% 3 5% 15% 34% 11%	7680
	21st to end	Night	43% 2 5% 15% 25% 10%	8401
February	1st to 10th	Night	40% 3 8% 21% 21% 7%	2620
	11th to 20th	Night	43% 4 6% 18% 23% 7%	2459
	21st to end	Night	39% 5% 8% 17% 21% 11%	2076
March	1st to 10th	Night	41% 4 9% 13% 26% 7%	5060
	11th to 20th	Night	27% 4 7% 13% 30% 18%	5090
	21st to end	Night	38% 4 6% 20% 21% 11%	5588
April	1st to 10th	Night	35% 5% 9% 19% 25% 7%	2310
	11th to 20th	Night	31% 4 7% 23% 25% 10%	2136
	21st to end	Night	31% 6% 10% 27% 21% 4	1890
May	1st to 10th	Night	43% 8% 14% 20% 13% 2	5264
	11th to 20th	Night	42% 7% 15% 21% 14% 1	5235
	21st to end	Night	45% 8% 13% 17% 15% 2	5771
June	1st to 10th	Night	40% 10% 17% 19% 12% 2	1890
	11th to 20th	Night	34% 9% 18% 24% 13% 2	1890
	21st to end	Night	36% 13% 16% 18% 14% 3	1890
July	1st to 10th	Night	40% 13% 23% 18% 5% 1	5235
	11th to 20th	Night	38% 17% 26% 15% 3 1	5226
	21st to end	Night	49% 12% 20% 13% 5% 1	5606
August	1st to 10th	Night	53% 14% 17% 13% 3	4124
	11th to 20th	Night	36% 11% 24% 22% 7%	4122
	21st to end	Night	36% 9% 14% 24% 15% 2	5048
September	1st to 10th	Night	36% 9% 16% 19% 16% 4	2310
	11th to 20th	Night	42% 7% 14% 16% 19% 2	2310
	21st to end	Night	39% 5% 12% 18% 20% 6%	2289
October	1st to 10th	Night	27% 6% 10% 18% 32% 7%	3656
	11th to 20th	Night	20% 3 6% 17% 27% 28%	3899
	21st to end	Night	26% 3 5% 20% 28% 18%	4252
November	1st to 10th	Night	32% 5% 7% 18% 27% 11%	2482
	11th to 20th	Night	33% 4 6% 18% 28% 12%	2730
	21st to end	Night	36% 4 6% 20% 26% 8%	2730
December	1st to 10th	Night	36% 4 5% 17% 30% 8%	4380
	11th to 20th	Night	40% 5% 10% 16% 21% 9%	4954
	21st to end	Night	42% 4 7% 25% 20% 3	6633

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	20% 20% 39% 18% 3	330
	11th to 20th	Day	25% 20% 33% 19% 3	330
	21st to end	Day	25% 23% 38% 11% 3	363
February	1st to 10th	Day	16% 19% 44% 18% 3	330
	11th to 20th	Day	35% 15% 35% 13% 2	330
	21st to end	Day	30% 19% 35% 13% 2 1	273
March	1st to 10th	Day	24% 13% 31% 25% 7%	519
	11th to 20th	Day	20% 15% 40% 19% 6%	540
	21st to end	Day	19% 14% 38% 22% 7% 1	594
April	1st to 10th	Day	17% 15% 31% 24% 11% 1	540
	11th to 20th	Day	12% 13% 33% 25% 15% 1	532
	21st to end	Day	14% 9% 26% 29% 16% 6%	540
May	1st to 10th	Day	13% 12% 33% 22% 15% 4	543
	11th to 20th	Day	16% 7% 20% 26% 23% 8%	567
	21st to end	Day	18% 5% 18% 24% 22% 13%	617
June	1st to 10th	Day	12% 4 17% 31% 25% 11%	570
	11th to 20th	Day	7% 4 16% 31% 26% 16%	570
	21st to end	Day	8% 3 14% 32% 29% 14%	570
July	1st to 10th	Day	8% 2 11% 22% 34% 22%	565
	11th to 20th	Day	7% 1 9% 26% 38% 19%	564
	21st to end	Day	6% 2 10% 29% 37% 17%	620
August	1st to 10th	Day	16% 6% 13% 23% 26% 17%	566
	11th to 20th	Day	13% 4 10% 23% 30% 21%	559
	21st to end	Day	12% 4 11% 26% 27% 20%	627
September	1st to 10th	Day	9% 1 12% 31% 31% 16%	570
	11th to 20th	Day	17% 3 12% 22% 31% 15%	570
	21st to end	Day	19% 4 17% 27% 25% 8%	562
October	1st to 10th	Day	17% 5% 22% 28% 17% 10%	530
	11th to 20th	Day	13% 6% 23% 30% 23% 5%	530
	21st to end	Day	15% 7% 26% 29% 20% 3	583
November	1st to 10th	Day	20% 8% 25% 27% 14% 4	510
	11th to 20th	Day	16% 12% 39% 22% 9% 1	330
	21st to end	Day	12% 15% 35% 27% 9% 2	330
December	1st to 10th	Day	27% 17% 32% 20% 3	330
	11th to 20th	Day	23% 11% 35% 24% 6% 1	330
	21st to end	Day	28% 15% 32% 17% 6% 2	363
January	1st to 10th	Night	22% 14% 30% 27% 6%	840
	11th to 20th	Night	20% 15% 33% 25% 6%	840
	21st to end	Night	20% 13% 37% 27% 3	924
February	1st to 10th	Night	18% 12% 32% 32% 5%	840
	11th to 20th	Night	24% 13% 36% 24% 3	823
	21st to end	Night	20% 16% 34% 27% 3	692
March	1st to 10th	Night	18% 12% 32% 32% 5%	840
	11th to 20th	Night	16% 13% 35% 27% 8% 1	840
	21st to end	Night	16% 12% 36% 27% 9%	924
April	1st to 10th	Night	12% 16% 29% 32% 11%	840
	11th to 20th	Night	12% 11% 29% 33% 14% 1	792
	21st to end	Night	12% 6% 26% 36% 20% 1	630
May	1st to 10th	Night	11% 7% 29% 35% 17% 1	630
	11th to 20th	Night	13% 4 25% 33% 23% 2	621
	21st to end	Night	14% 3 13% 33% 31% 6%	683
June	1st to 10th	Night	14% 2 14% 34% 30% 6%	630
	11th to 20th	Night	11% 1 17% 28% 35% 9%	630
	21st to end	Night	8% 2 12% 33% 38% 7%	630
July	1st to 10th	Night	10% 2 8% 27% 42% 11%	615
	11th to 20th	Night	10% 1 6% 28% 45% 10%	612
	21st to end	Night	8% 2 11% 28% 43% 7%	690
August	1st to 10th	Night	15% 3 9% 29% 35% 9%	627
	11th to 20th	Night	13% 2 10% 28% 39% 8%	624
	21st to end	Night	12% 2 10% 26% 41% 9%	787
September	1st to 10th	Night	10% 2 11% 31% 38% 7%	840
	11th to 20th	Night	15% 3 12% 26% 38% 5%	840
	21st to end	Night	17% 3 15% 31% 30% 4	833
October	1st to 10th	Night	13% 4 17% 31% 29% 6%	800
	11th to 20th	Night	15% 5% 21% 35% 21% 4	800
	21st to end	Night	14% 8% 22% 34% 21% 2	880
November	1st to 10th	Night	15% 6% 23% 35% 19% 2	820
	11th to 20th	Night	18% 9% 28% 31% 13% 1	840
	21st to end	Night	16% 8% 28% 34% 13% 1	840
December	1st to 10th	Night	22% 12% 26% 32% 8%	840
	11th to 20th	Night	19% 10% 27% 33% 10% 1	840
	21st to end	Night	25% 12% 25% 31% 7%	924

Page generated at 2026-09-26 04:18:43. Version ac07

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