Waynesville
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Waynesville clear sky chart from 2005-11-06 to 2024-11-05.

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	10% 8% 3 8% 6% 6% 6% 5% 6% 7% 36%	101100
	Night	9% 8% 3 8% 5% 5% 5% 4 6% 8% 39%	97898
Transparency	Day	42% 9% 12% 17% 15% 5%	104868
	Night	38% 10% 14% 18% 15% 6%	102269
Seeing	Day	17% 15% 25% 22% 14% 7%	15000
	Night	14% 12% 23% 28% 19% 4	25035

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	8% 8% 3 8% 4 4 4 5% 7% 8% 41%	2836
	11th to 20th	Day	7% 7% 4 10% 7% 5% 4 4 5% 4 45%	2840
	21st to end	Day	12% 12% 4 7% 4 4 4 3 4 5% 41%	3124
February	1st to 10th	Day	8% 8% 4 9% 5% 5% 6% 4 5% 7% 40%	1827
	11th to 20th	Day	8% 9% 3 9% 6% 5% 4 4 5% 6% 39%	1848
	21st to end	Day	9% 9% 3 8% 7% 5% 4 5% 5% 6% 38%	1570
March	1st to 10th	Day	17% 8% 3 7% 4 4 4 3 5% 6% 38%	3328
	11th to 20th	Day	9% 8% 3 7% 4 4 3 3 4 5% 50%	3480
	21st to end	Day	14% 10% 3 8% 5% 4 5% 3 5% 6% 37%	3815
April	1st to 10th	Day	8% 8% 3 6% 6% 5% 5% 5% 7% 8% 40%	2090
	11th to 20th	Day	11% 8% 3 8% 6% 4 5% 4 6% 6% 40%	2284
	21st to end	Day	11% 7% 3 7% 5% 5% 4 4 5% 6% 42%	2470
May	1st to 10th	Day	9% 9% 4 11% 6% 6% 6% 5% 6% 7% 33%	4082
	11th to 20th	Day	13% 10% 4 10% 7% 6% 6% 4 6% 6% 29%	4081
	21st to end	Day	7% 6% 3 8% 6% 6% 6% 5% 8% 10% 36%	4476
June	1st to 10th	Day	9% 8% 3 8% 8% 8% 7% 5% 8% 9% 26%	2470
	11th to 20th	Day	7% 7% 3 10% 7% 7% 7% 7% 8% 10% 28%	2470
	21st to end	Day	8% 7% 2 8% 7% 7% 7% 6% 7% 10% 31%	2470
July	1st to 10th	Day	8% 7% 3 9% 8% 7% 7% 6% 8% 10% 28%	4120
	11th to 20th	Day	9% 8% 3 11% 8% 8% 8% 6% 7% 8% 25%	4120
	21st to end	Day	10% 8% 3 12% 11% 11% 9% 6% 8% 7% 14%	4466
August	1st to 10th	Day	11% 7% 3 9% 7% 7% 7% 6% 8% 9% 25%	4104
	11th to 20th	Day	8% 6% 3 9% 8% 7% 8% 5% 8% 11% 27%	4044
	21st to end	Day	7% 6% 3 9% 6% 6% 7% 5% 7% 8% 36%	4158
September	1st to 10th	Day	11% 7% 3 9% 7% 6% 7% 5% 6% 7% 31%	2090
	11th to 20th	Day	16% 9% 3 9% 5% 5% 6% 4 6% 7% 30%	2090
	21st to end	Day	14% 7% 3 7% 6% 4 5% 4 6% 7% 36%	2090
October	1st to 10th	Day	11% 6% 2 7% 6% 4 4 4 5% 6% 46%	2081
	11th to 20th	Day	7% 6% 3 6% 4 5% 4 3 5% 6% 52%	1900
	21st to end	Day	9% 6% 2 5% 4 3 4 2 4 7% 53%	2090
November	1st to 10th	Day	7% 6% 2 5% 4 4 4 3 5% 6% 54%	1779
	11th to 20th	Day	7% 7% 2 6% 4 3 4 4 5% 8% 50%	1710
	21st to end	Day	8% 8% 2 6% 4 4 4 4 5% 7% 46%	1710
December	1st to 10th	Day	10% 10% 4 8% 7% 4 6% 4 7% 6% 36%	1710
	11th to 20th	Day	8% 7% 2 7% 5% 4 4 4 7% 7% 45%	2153
	21st to end	Day	10% 7% 3 9% 5% 5% 6% 4 4 6% 40%	3124
January	1st to 10th	Night	9% 9% 4 9% 6% 4 4 4 5% 8% 39%	4109
	11th to 20th	Night	5% 7% 4 10% 5% 5% 5% 4 6% 6% 44%	4120
	21st to end	Night	11% 16% 4 8% 5% 4 3 3 4 4 38%	4532
February	1st to 10th	Night	6% 8% 4 7% 5% 6% 5% 4 6% 8% 41%	2352
	11th to 20th	Night	9% 11% 3 8% 6% 4 5% 4 6% 6% 38%	2218
	21st to end	Night	9% 8% 4 9% 5% 6% 6% 4 7% 7% 35%	1884
March	1st to 10th	Night	15% 14% 4 9% 5% 5% 6% 4 5% 5% 29%	3523
	11th to 20th	Night	8% 8% 3 7% 5% 4 4 3 6% 7% 45%	3480
	21st to end	Night	12% 8% 2 8% 5% 5% 5% 4 6% 8% 38%	3817
April	1st to 10th	Night	8% 9% 3 7% 5% 4 4 3 6% 8% 43%	2090
	11th to 20th	Night	7% 8% 3 7% 5% 4 4 4 5% 7% 45%	1859
	21st to end	Night	8% 8% 3 6% 4 4 4 4 5% 7% 47%	1710
May	1st to 10th	Night	7% 8% 4 11% 7% 6% 6% 4 6% 7% 33%	2813
	11th to 20th	Night	11% 11% 4 11% 6% 5% 5% 4 5% 7% 31%	2812
	21st to end	Night	5% 6% 3 8% 5% 6% 6% 5% 7% 10% 39%	3079
June	1st to 10th	Night	6% 6% 3 8% 6% 6% 6% 5% 9% 11% 33%	1710
	11th to 20th	Night	4 5% 2 7% 5% 5% 5% 6% 9% 13% 40%	1710
	21st to end	Night	6% 4 2 5% 6% 5% 5% 6% 9% 10% 39%	1710
July	1st to 10th	Night	7% 6% 2 6% 6% 7% 7% 6% 10% 12% 31%	2840
	11th to 20th	Night	6% 4 2 7% 7% 6% 6% 5% 9% 11% 37%	2840
	21st to end	Night	8% 7% 4 10% 9% 8% 8% 6% 8% 9% 23%	3087
August	1st to 10th	Night	8% 6% 3 9% 5% 6% 7% 6% 8% 11% 32%	2825
	11th to 20th	Night	8% 7% 2 8% 6% 6% 7% 5% 8% 9% 33%	2785
	21st to end	Night	7% 5% 2 6% 4 4 6% 5% 7% 9% 47%	3460
September	1st to 10th	Night	8% 9% 3 8% 6% 5% 6% 5% 7% 8% 36%	2090
	11th to 20th	Night	12% 9% 3 9% 5% 5% 4 5% 5% 8% 34%	2090
	21st to end	Night	11% 7% 3 7% 4 4 5% 3 5% 8% 43%	2090
October	1st to 10th	Night	11% 8% 2 5% 4 4 4 3 5% 7% 48%	2097
	11th to 20th	Night	8% 7% 3 7% 5% 4 5% 3 5% 5% 49%	2280
	21st to end	Night	8% 8% 2 6% 3 4 4 3 4 6% 52%	2508
November	1st to 10th	Night	8% 7% 3 6% 4 4 4 4 5% 6% 48%	2394
	11th to 20th	Night	8% 9% 2 7% 4 4 4 3 5% 7% 47%	2470
	21st to end	Night	9% 7% 2 6% 5% 4 6% 4 6% 6% 46%	2470
December	1st to 10th	Night	9% 10% 4 9% 5% 4 5% 4 7% 6% 35%	2470
	11th to 20th	Night	9% 10% 3 8% 4 4 4 3 5% 6% 44%	3042
	21st to end	Night	11% 8% 4 11% 6% 5% 5% 5% 7% 8% 30%	4532

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	35% 7% 8% 18% 26% 7%	2837
	11th to 20th	Day	38% 9% 8% 13% 25% 8%	2840
	21st to end	Day	41% 8% 7% 13% 24% 6%	3124
February	1st to 10th	Day	43% 6% 9% 18% 17% 6%	1827
	11th to 20th	Day	44% 7% 8% 15% 19% 7%	1858
	21st to end	Day	45% 8% 9% 13% 18% 8%	1570
March	1st to 10th	Day	43% 7% 8% 16% 15% 10%	3328
	11th to 20th	Day	35% 7% 8% 16% 23% 11%	3480
	21st to end	Day	45% 7% 10% 21% 12% 5%	3815
April	1st to 10th	Day	38% 7% 13% 19% 18% 4	2090
	11th to 20th	Day	42% 8% 9% 16% 20% 5%	2284
	21st to end	Day	41% 7% 11% 24% 15% 2	2470
May	1st to 10th	Day	46% 11% 12% 19% 11% 1	4120
	11th to 20th	Day	50% 12% 10% 19% 9% 1	4085
	21st to end	Day	37% 14% 15% 18% 15% 1	4489
June	1st to 10th	Day	50% 13% 16% 15% 6% 1	2470
	11th to 20th	Day	44% 14% 16% 14% 10% 1	2470
	21st to end	Day	45% 11% 15% 16% 10% 2	2470
July	1st to 10th	Day	45% 15% 18% 16% 6%	4055
	11th to 20th	Day	50% 13% 20% 12% 4 1	4051
	21st to end	Day	60% 15% 13% 8% 3	4324
August	1st to 10th	Day	48% 11% 17% 20% 4	4091
	11th to 20th	Day	43% 12% 22% 12% 8% 2	4083
	21st to end	Day	40% 11% 14% 24% 10% 1	4158
September	1st to 10th	Day	47% 10% 11% 16% 13% 3	2090
	11th to 20th	Day	51% 8% 8% 17% 13% 1	2090
	21st to end	Day	44% 8% 13% 17% 14% 5%	2090
October	1st to 10th	Day	28% 7% 9% 15% 28% 12%	3458
	11th to 20th	Day	23% 4 5% 19% 22% 26%	3140
	21st to end	Day	22% 4 10% 24% 23% 17%	3428
November	1st to 10th	Day	30% 5% 9% 18% 27% 11%	1779
	11th to 20th	Day	32% 6% 7% 19% 26% 10%	1710
	21st to end	Day	36% 6% 7% 20% 23% 8%	1710
December	1st to 10th	Day	46% 7% 9% 17% 15% 6%	1710
	11th to 20th	Day	36% 5% 11% 14% 22% 11%	2150
	21st to end	Day	40% 7% 10% 21% 18% 4	3124
January	1st to 10th	Night	37% 9% 10% 14% 21% 9%	4109
	11th to 20th	Night	37% 9% 7% 11% 26% 10%	4120
	21st to end	Night	47% 6% 7% 12% 19% 8%	4532
February	1st to 10th	Night	40% 7% 12% 17% 19% 5%	2352
	11th to 20th	Night	45% 7% 8% 18% 16% 5%	2219
	21st to end	Night	46% 8% 10% 15% 14% 6%	1884
March	1st to 10th	Night	48% 14% 9% 12% 13% 5%	3523
	11th to 20th	Night	35% 8% 10% 22% 17% 10%	3480
	21st to end	Night	42% 9% 11% 21% 12% 5%	3817
April	1st to 10th	Night	36% 8% 14% 21% 18% 3	2090
	11th to 20th	Night	35% 8% 11% 21% 19% 4	1859
	21st to end	Night	36% 9% 13% 27% 15% 1	1710
May	1st to 10th	Night	44% 12% 14% 22% 7% 1	2840
	11th to 20th	Night	44% 13% 17% 18% 7%	2813
	21st to end	Night	31% 16% 20% 24% 8%	3087
June	1st to 10th	Night	39% 14% 21% 19% 7% 1	1710
	11th to 20th	Night	31% 14% 26% 22% 6% 1	1710
	21st to end	Night	33% 13% 20% 20% 11% 2	1710
July	1st to 10th	Night	37% 18% 23% 17% 4	2795
	11th to 20th	Night	35% 17% 28% 17% 3 1	2786
	21st to end	Night	49% 17% 20% 10% 4	2988
August	1st to 10th	Night	39% 13% 28% 16% 4	2814
	11th to 20th	Night	38% 14% 29% 13% 6%	2812
	21st to end	Night	30% 11% 21% 29% 8% 1	3460
September	1st to 10th	Night	41% 14% 14% 18% 12% 2	2090
	11th to 20th	Night	47% 10% 12% 17% 13% 1	2090
	21st to end	Night	38% 8% 13% 22% 16% 3	2090
October	1st to 10th	Night	27% 7% 13% 19% 26% 8%	3500
	11th to 20th	Night	26% 5% 7% 19% 21% 22%	3779
	21st to end	Night	23% 4 10% 26% 20% 17%	4120
November	1st to 10th	Night	33% 8% 11% 19% 21% 9%	2394
	11th to 20th	Night	36% 5% 8% 18% 23% 11%	2470
	21st to end	Night	36% 7% 8% 21% 21% 7%	2470
December	1st to 10th	Night	46% 8% 11% 15% 14% 6%	2470
	11th to 20th	Night	39% 8% 7% 14% 24% 9%	3044
	21st to end	Night	45% 8% 11% 17% 15% 4	4532

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	24% 30% 34% 10% 1	270
	11th to 20th	Day	31% 28% 26% 12% 2	270
	21st to end	Day	26% 38% 28% 7% 2	297
February	1st to 10th	Day	27% 31% 31% 9% 3	270
	11th to 20th	Day	39% 30% 25% 6%	270
	21st to end	Day	39% 36% 20% 4 1	225
March	1st to 10th	Day	25% 23% 32% 13% 7%	387
	11th to 20th	Day	23% 29% 30% 13% 4 1	460
	21st to end	Day	21% 26% 33% 13% 6%	506
April	1st to 10th	Day	23% 22% 28% 20% 7% 1	460
	11th to 20th	Day	21% 25% 24% 17% 10% 3	452
	21st to end	Day	18% 18% 30% 20% 10% 3	460
May	1st to 10th	Day	17% 22% 29% 19% 8% 5%	463
	11th to 20th	Day	17% 11% 29% 24% 11% 7%	487
	21st to end	Day	12% 12% 22% 30% 15% 10%	529
June	1st to 10th	Day	12% 8% 28% 26% 17% 10%	490
	11th to 20th	Day	7% 8% 25% 23% 26% 11%	490
	21st to end	Day	9% 8% 29% 25% 17% 12%	490
July	1st to 10th	Day	8% 4 20% 25% 27% 16%	485
	11th to 20th	Day	8% 4 16% 28% 25% 19%	484
	21st to end	Day	10% 4 15% 28% 26% 17%	532
August	1st to 10th	Day	15% 5% 21% 23% 20% 16%	486
	11th to 20th	Day	10% 4 19% 29% 23% 15%	479
	21st to end	Day	10% 4 16% 26% 27% 17%	539
September	1st to 10th	Day	9% 4 20% 28% 27% 12%	490
	11th to 20th	Day	16% 6% 19% 25% 24% 10%	490
	21st to end	Day	18% 9% 19% 28% 20% 5%	490
October	1st to 10th	Day	17% 10% 21% 27% 19% 8%	490
	11th to 20th	Day	11% 17% 26% 27% 16% 3	490
	21st to end	Day	16% 15% 24% 29% 12% 4	539
November	1st to 10th	Day	14% 15% 31% 25% 11% 3	353
	11th to 20th	Day	21% 21% 34% 18% 5%	270
	21st to end	Day	16% 25% 33% 20% 6% 1	270
December	1st to 10th	Day	27% 27% 29% 13% 4	270
	11th to 20th	Day	18% 24% 35% 18% 4	270
	21st to end	Day	23% 22% 41% 10% 4 1	297
January	1st to 10th	Night	19% 19% 33% 22% 5% 1	760
	11th to 20th	Night	19% 23% 33% 21% 5%	760
	21st to end	Night	17% 21% 36% 23% 3	836
February	1st to 10th	Night	15% 20% 32% 28% 4	760
	11th to 20th	Night	23% 20% 36% 19% 2	743
	21st to end	Night	25% 24% 29% 19% 3	628
March	1st to 10th	Night	19% 19% 31% 26% 5%	760
	11th to 20th	Night	18% 21% 29% 23% 8% 1	760
	21st to end	Night	18% 19% 33% 22% 8%	836
April	1st to 10th	Night	17% 23% 28% 23% 8% 1	760
	11th to 20th	Night	16% 16% 29% 25% 12% 3	616
	21st to end	Night	12% 15% 24% 35% 13% 1	570
May	1st to 10th	Night	14% 12% 27% 28% 17% 2	570
	11th to 20th	Night	11% 8% 22% 33% 23% 3	561
	21st to end	Night	10% 4 16% 29% 33% 7%	617
June	1st to 10th	Night	6% 4 19% 36% 29% 6%	570
	11th to 20th	Night	4 3 16% 30% 35% 11%	570
	21st to end	Night	6% 3 13% 32% 38% 7%	570
July	1st to 10th	Night	8% 2 9% 29% 43% 9%	555
	11th to 20th	Night	9% 1 7% 28% 41% 13%	552
	21st to end	Night	7% 2 8% 28% 44% 12%	624
August	1st to 10th	Night	7% 3 8% 31% 41% 10%	567
	11th to 20th	Night	9% 2 9% 32% 39% 9%	564
	21st to end	Night	10% 2 8% 27% 40% 12%	654
September	1st to 10th	Night	10% 4 12% 27% 39% 8%	760
	11th to 20th	Night	16% 5% 13% 28% 32% 7%	760
	21st to end	Night	15% 6% 15% 33% 27% 4	760
October	1st to 10th	Night	14% 9% 18% 25% 26% 8%	760
	11th to 20th	Night	14% 10% 24% 32% 18% 2	760
	21st to end	Night	14% 12% 18% 38% 14% 3	836
November	1st to 10th	Night	13% 10% 21% 34% 19% 4	760
	11th to 20th	Night	16% 14% 23% 32% 12% 3	760
	21st to end	Night	16% 14% 24% 30% 14% 1	760
December	1st to 10th	Night	18% 16% 29% 29% 8%	760
	11th to 20th	Night	14% 18% 29% 30% 8% 1	760
	21st to end	Night	20% 16% 30% 29% 5%	836

Page generated at 2024-11-03 02:11:29. Version ac07

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