Waynesboro
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Waynesboro clear sky chart from 2005-11-06 to 2024-01-16.

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	13% 6% 2 5% 5% 3 5% 5% 6% 8% 42%	74645
	Night	13% 6% 2 5% 5% 3 5% 5% 5% 7% 45%	75164
Transparency	Day	40% 6% 12% 23% 16% 3	74366
	Night	38% 5% 12% 24% 17% 4	74962
Seeing	Day	19% 13% 24% 24% 15% 6%	13888
	Night	16% 11% 24% 31% 15% 2	23799

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	11% 8% 4 5% 6% 3 5% 4 5% 6% 44%	1706
	11th to 20th	Day	14% 8% 3 6% 5% 3 5% 4 4 6% 40%	1671
	21st to end	Day	13% 8% 3 5% 5% 3 4 4 6% 6% 44%	1782
February	1st to 10th	Day	11% 7% 4 8% 5% 4 5% 5% 5% 6% 40%	1620
	11th to 20th	Day	14% 7% 3 6% 5% 3 5% 4 6% 6% 41%	1573
	21st to end	Day	16% 7% 2 5% 7% 3 4 5% 6% 6% 39%	1547
March	1st to 10th	Day	13% 6% 2 4 4 2 4 5% 3 6% 51%	1980
	11th to 20th	Day	15% 6% 3 6% 5% 3 6% 5% 5% 7% 39%	1980
	21st to end	Day	14% 9% 3 7% 5% 3 5% 5% 5% 6% 37%	2178
April	1st to 10th	Day	9% 6% 3 5% 4 3 5% 4 6% 9% 47%	2108
	11th to 20th	Day	11% 6% 2 4 5% 3 5% 4 5% 7% 46%	2134
	21st to end	Day	15% 6% 3 6% 5% 4 5% 4 4 6% 41%	2215
May	1st to 10th	Day	14% 6% 2 6% 6% 4 6% 6% 6% 8% 37%	2340
	11th to 20th	Day	17% 6% 3 6% 6% 3 5% 5% 6% 7% 35%	2301
	21st to end	Day	13% 6% 2 6% 5% 3 6% 5% 6% 9% 38%	2611
June	1st to 10th	Day	12% 4 2 5% 5% 4 6% 5% 6% 9% 43%	2520
	11th to 20th	Day	10% 5% 3 5% 6% 4 7% 6% 7% 10% 37%	2520
	21st to end	Day	8% 4 2 5% 5% 3 5% 6% 7% 10% 42%	2520
July	1st to 10th	Day	10% 5% 3 6% 5% 4 6% 6% 7% 9% 38%	2352
	11th to 20th	Day	6% 3 2 6% 6% 4 7% 8% 8% 12% 37%	2340
	21st to end	Day	9% 5% 3 6% 7% 4 7% 7% 8% 9% 33%	2547
August	1st to 10th	Day	10% 6% 2 7% 7% 4 7% 6% 8% 10% 33%	2327
	11th to 20th	Day	13% 5% 2 6% 8% 4 5% 7% 7% 9% 34%	2281
	21st to end	Day	11% 6% 2 6% 5% 3 6% 6% 7% 10% 39%	2376
September	1st to 10th	Day	13% 6% 2 5% 4 4 4 5% 4 7% 46%	2160
	11th to 20th	Day	13% 6% 2 6% 5% 3 5% 4 5% 8% 44%	2055
	21st to end	Day	21% 6% 2 5% 5% 3 4 5% 6% 7% 37%	1936
October	1st to 10th	Day	16% 5% 2 5% 5% 3 4 4 5% 6% 47%	1800
	11th to 20th	Day	16% 5% 1 4 3 2 4 4 5% 7% 50%	1800
	21st to end	Day	13% 6% 2 4 5% 2 4 3 4 6% 50%	1980
November	1st to 10th	Day	12% 5% 2 3 4 2 3 3 5% 5% 55%	1857
	11th to 20th	Day	13% 5% 2 4 4 3 4 4 5% 6% 50%	1701
	21st to end	Day	13% 5% 3 4 4 3 3 4 5% 6% 50%	1520
December	1st to 10th	Day	14% 7% 3 5% 5% 3 5% 4 6% 7% 40%	1520
	11th to 20th	Day	14% 5% 2 4 3 2 3 3 3 6% 54%	1910
	21st to end	Day	18% 7% 2 5% 5% 3 4 5% 6% 8% 36%	2877
January	1st to 10th	Night	12% 6% 2 4 5% 3 5% 4 5% 7% 47%	2459
	11th to 20th	Night	13% 7% 3 7% 4 3 5% 5% 5% 7% 42%	2417
	21st to end	Night	12% 8% 2 5% 4 2 4 4 5% 6% 46%	2574
February	1st to 10th	Night	11% 8% 2 5% 5% 3 6% 5% 6% 7% 42%	2340
	11th to 20th	Night	17% 8% 3 5% 4 2 5% 4 5% 5% 42%	2273
	21st to end	Night	13% 8% 3 5% 5% 3 4 5% 5% 8% 42%	1706
March	1st to 10th	Night	11% 4 2 5% 5% 3 5% 5% 4 6% 51%	1980
	11th to 20th	Night	17% 6% 2 4 5% 3 4 5% 5% 7% 41%	1980
	21st to end	Night	14% 7% 4 5% 5% 2 4 5% 4 6% 44%	2178
April	1st to 10th	Night	11% 6% 3 6% 6% 3 5% 4 6% 8% 44%	1850
	11th to 20th	Night	11% 5% 2 4 5% 3 4 5% 4 9% 48%	1775
	21st to end	Night	15% 5% 2 5% 5% 2 5% 4 5% 6% 45%	1760
May	1st to 10th	Night	15% 6% 3 4 5% 3 4 5% 5% 9% 42%	1620
	11th to 20th	Night	16% 7% 2 6% 5% 3 4 5% 6% 9% 37%	1592
	21st to end	Night	15% 5% 2 5% 5% 3 5% 4 6% 10% 41%	1659
June	1st to 10th	Night	9% 5% 2 4 5% 3 5% 6% 6% 11% 45%	1440
	11th to 20th	Night	10% 4 3 5% 5% 2 7% 6% 6% 8% 44%	1440
	21st to end	Night	8% 4 3 4 4 3 5% 5% 6% 11% 47%	1440
July	1st to 10th	Night	9% 6% 3 5% 6% 3 4 5% 7% 8% 44%	1602
	11th to 20th	Night	5% 3 2 5% 5% 3 6% 6% 7% 13% 45%	1620
	21st to end	Night	7% 5% 3 5% 6% 4 6% 6% 7% 12% 40%	1771
August	1st to 10th	Night	8% 6% 2 6% 7% 4 5% 7% 8% 9% 38%	1611
	11th to 20th	Night	11% 7% 4 6% 6% 4 5% 5% 6% 8% 40%	1602
	21st to end	Night	11% 6% 2 5% 6% 4 5% 5% 7% 10% 38%	1980
September	1st to 10th	Night	13% 5% 2 4 4 3 4 3 6% 8% 48%	1800
	11th to 20th	Night	12% 5% 3 4 5% 2 4 4 6% 8% 47%	1901
	21st to end	Night	21% 7% 2 5% 4 3 4 3 4 5% 42%	2024
October	1st to 10th	Night	17% 5% 2 5% 5% 2 4 3 5% 7% 46%	2160
	11th to 20th	Night	14% 5% 2 4 4 2 4 4 5% 6% 50%	2160
	21st to end	Night	13% 3 2 5% 4 2 3 4 5% 7% 51%	2376
November	1st to 10th	Night	11% 7% 3 5% 4 2 4 3 4 5% 53%	2221
	11th to 20th	Night	12% 6% 3 5% 3 3 5% 4 4 6% 51%	2474
	21st to end	Night	13% 5% 2 4 4 3 5% 5% 5% 6% 50%	2660
December	1st to 10th	Night	14% 7% 2 6% 5% 3 5% 5% 4 7% 42%	2660
	11th to 20th	Night	13% 6% 3 5% 4 2 4 4 4 6% 47%	3285
	21st to end	Night	14% 5% 2 6% 5% 4 5% 6% 6% 7% 41%	4774

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	41% 5% 9% 22% 18% 5%	1707
	11th to 20th	Day	45% 4 9% 22% 17% 2	1671
	21st to end	Day	40% 4 9% 23% 19% 5%	1782
February	1st to 10th	Day	45% 4 10% 23% 15% 3	1620
	11th to 20th	Day	43% 5% 9% 20% 18% 5%	1582
	21st to end	Day	46% 4 10% 18% 17% 6%	1547
March	1st to 10th	Day	36% 4 9% 24% 23% 5%	1980
	11th to 20th	Day	44% 5% 10% 18% 17% 6%	1980
	21st to end	Day	46% 6% 10% 20% 13% 5%	2178
April	1st to 10th	Day	35% 5% 11% 23% 18% 8%	2108
	11th to 20th	Day	36% 5% 12% 21% 21% 5%	2134
	21st to end	Day	44% 4 11% 23% 13% 4	2215
May	1st to 10th	Day	43% 6% 15% 19% 14% 2	2340
	11th to 20th	Day	46% 7% 16% 20% 9% 2	2305
	21st to end	Day	43% 6% 15% 24% 10% 1	2611
June	1st to 10th	Day	37% 7% 16% 25% 14% 1	2520
	11th to 20th	Day	40% 8% 17% 20% 14% 1	2520
	21st to end	Day	34% 9% 16% 26% 13% 1	2520
July	1st to 10th	Day	41% 8% 14% 21% 15% 2	2287
	11th to 20th	Day	34% 9% 19% 23% 13% 1	2271
	21st to end	Day	42% 9% 13% 23% 12% 1	2405
August	1st to 10th	Day	43% 7% 18% 23% 9% 1	2314
	11th to 20th	Day	43% 8% 15% 22% 11% 1	2281
	21st to end	Day	38% 7% 19% 22% 11% 2	2376
September	1st to 10th	Day	39% 6% 15% 19% 18% 4	2160
	11th to 20th	Day	39% 6% 7% 27% 18% 3	2055
	21st to end	Day	45% 5% 10% 19% 18% 2	1936
October	1st to 10th	Day	38% 5% 8% 28% 16% 5%	1800
	11th to 20th	Day	35% 3 11% 26% 21% 4	1800
	21st to end	Day	36% 3 7% 27% 21% 5%	1980
November	1st to 10th	Day	32% 4 9% 24% 27% 5%	1857
	11th to 20th	Day	36% 4 10% 21% 22% 8%	1701
	21st to end	Day	35% 4 9% 25% 24% 3	1520
December	1st to 10th	Day	44% 4 11% 22% 16% 4	1520
	11th to 20th	Day	33% 3 9% 28% 19% 7%	1906
	21st to end	Day	44% 5% 11% 26% 13% 2	2877
January	1st to 10th	Night	37% 5% 10% 22% 19% 7%	2459
	11th to 20th	Night	42% 5% 10% 22% 17% 4	2417
	21st to end	Night	38% 3 8% 25% 22% 3	2574
February	1st to 10th	Night	40% 5% 12% 24% 16% 3	2340
	11th to 20th	Night	43% 4 8% 20% 18% 7%	2275
	21st to end	Night	41% 3 12% 22% 16% 6%	1706
March	1st to 10th	Night	34% 5% 10% 26% 20% 5%	1980
	11th to 20th	Night	41% 6% 7% 22% 19% 4	1980
	21st to end	Night	42% 5% 11% 20% 16% 5%	2178
April	1st to 10th	Night	38% 6% 11% 20% 19% 6%	1850
	11th to 20th	Night	34% 4 15% 20% 22% 5%	1775
	21st to end	Night	40% 4 11% 27% 15% 4	1760
May	1st to 10th	Night	40% 5% 15% 23% 13% 4	1620
	11th to 20th	Night	43% 7% 15% 21% 11% 2	1593
	21st to end	Night	40% 7% 17% 26% 10% 1	1660
June	1st to 10th	Night	33% 9% 13% 31% 13% 1	1440
	11th to 20th	Night	36% 9% 16% 25% 12% 2	1440
	21st to end	Night	32% 8% 19% 23% 17% 3	1440
July	1st to 10th	Night	37% 8% 18% 20% 14% 3	1557
	11th to 20th	Night	29% 10% 21% 28% 12% 2	1566
	21st to end	Night	35% 8% 20% 26% 12%	1672
August	1st to 10th	Night	40% 8% 18% 24% 9% 1	1600
	11th to 20th	Night	41% 7% 16% 24% 12% 1	1602
	21st to end	Night	40% 7% 19% 23% 9% 3	1980
September	1st to 10th	Night	36% 6% 16% 21% 17% 4	1800
	11th to 20th	Night	35% 5% 11% 28% 18% 3	1901
	21st to end	Night	45% 4 10% 22% 17% 3	2024
October	1st to 10th	Night	39% 4 11% 26% 17% 3	2160
	11th to 20th	Night	36% 3 8% 27% 21% 4	2160
	21st to end	Night	33% 4 9% 24% 26% 5%	2376
November	1st to 10th	Night	34% 3 9% 22% 25% 6%	2221
	11th to 20th	Night	36% 3 8% 22% 24% 6%	2474
	21st to end	Night	36% 4 8% 25% 21% 5%	2660
December	1st to 10th	Night	43% 5% 9% 23% 16% 4	2660
	11th to 20th	Night	39% 4 8% 22% 21% 6%	3288
	21st to end	Night	41% 4 11% 24% 18% 2	4774

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	26% 30% 26% 14% 4	270
	11th to 20th	Day	29% 29% 26% 14% 1	257
	21st to end	Day	28% 28% 29% 12% 2	264
February	1st to 10th	Day	27% 29% 33% 9% 2	240
	11th to 20th	Day	40% 25% 28% 7%	240
	21st to end	Day	34% 19% 25% 18% 2	319
March	1st to 10th	Day	24% 25% 26% 20% 5%	420
	11th to 20th	Day	25% 23% 27% 17% 5% 2	420
	21st to end	Day	23% 17% 32% 22% 5% 1	462
April	1st to 10th	Day	23% 23% 25% 19% 10% 1	420
	11th to 20th	Day	20% 16% 26% 22% 12% 4	412
	21st to end	Day	24% 16% 29% 19% 9% 2	420
May	1st to 10th	Day	22% 21% 27% 19% 8% 4	423
	11th to 20th	Day	21% 11% 28% 23% 14% 4	447
	21st to end	Day	19% 7% 20% 27% 20% 8%	485
June	1st to 10th	Day	14% 6% 26% 27% 20% 6%	450
	11th to 20th	Day	14% 7% 24% 28% 18% 9%	450
	21st to end	Day	10% 8% 26% 31% 18% 7%	450
July	1st to 10th	Day	11% 4 16% 31% 27% 11%	445
	11th to 20th	Day	5% 2 19% 34% 27% 13%	444
	21st to end	Day	11% 4 19% 32% 23% 11%	488
August	1st to 10th	Day	13% 4 17% 27% 28% 12%	446
	11th to 20th	Day	13% 2 18% 27% 27% 13%	439
	21st to end	Day	11% 3 14% 32% 21% 18%	495
September	1st to 10th	Day	15% 6% 15% 23% 23% 18%	450
	11th to 20th	Day	14% 4 14% 29% 28% 11%	450
	21st to end	Day	27% 9% 17% 25% 18% 4	450
October	1st to 10th	Day	20% 7% 19% 29% 19% 6%	450
	11th to 20th	Day	18% 15% 23% 23% 18% 3	450
	21st to end	Day	16% 17% 32% 21% 12% 3	495
November	1st to 10th	Day	18% 11% 28% 28% 13% 3	455
	11th to 20th	Day	23% 13% 26% 26% 12% 1	313
	21st to end	Day	22% 17% 32% 20% 8% 2	180
December	1st to 10th	Day	24% 21% 33% 15% 5% 1	180
	11th to 20th	Day	23% 22% 25% 19% 9% 2	180
	21st to end	Day	26% 20% 30% 17% 7%	229
January	1st to 10th	Night	18% 20% 35% 23% 3	760
	11th to 20th	Night	20% 18% 30% 29% 3	744
	21st to end	Night	18% 20% 34% 26% 2	792
February	1st to 10th	Night	16% 20% 33% 29% 2	720
	11th to 20th	Night	23% 24% 32% 20% 1	703
	21st to end	Night	20% 19% 34% 25% 2	592
March	1st to 10th	Night	14% 22% 31% 29% 4	720
	11th to 20th	Night	26% 16% 29% 22% 6% 1	720
	21st to end	Night	19% 14% 32% 28% 6% 1	792
April	1st to 10th	Night	16% 20% 34% 23% 7%	720
	11th to 20th	Night	15% 16% 28% 29% 12% 1	711
	21st to end	Night	19% 10% 31% 31% 9% 1	680
May	1st to 10th	Night	20% 10% 24% 29% 17% 1	540
	11th to 20th	Night	18% 6% 22% 36% 16% 1	531
	21st to end	Night	17% 2 14% 38% 26% 3	499
June	1st to 10th	Night	9% 2 17% 49% 21% 2	360
	11th to 20th	Night	10% 4 16% 40% 29% 1	360
	21st to end	Night	10% 3 17% 45% 22% 3	360
July	1st to 10th	Night	10% 2 14% 32% 36% 7%	507
	11th to 20th	Night	6% 1 8% 35% 44% 6%	522
	21st to end	Night	8% 3 11% 38% 33% 6%	591
August	1st to 10th	Night	11% 2 10% 39% 33% 4	537
	11th to 20th	Night	14% 3 8% 35% 37% 4	538
	21st to end	Night	13% 3 9% 35% 34% 5%	792
September	1st to 10th	Night	16% 2 11% 33% 32% 6%	720
	11th to 20th	Night	13% 3 12% 34% 33% 5%	720
	21st to end	Night	24% 6% 16% 31% 21% 2	720
October	1st to 10th	Night	19% 6% 17% 31% 24% 3	720
	11th to 20th	Night	17% 11% 24% 31% 16% 1	720
	21st to end	Night	16% 10% 28% 32% 13% 2	792
November	1st to 10th	Night	15% 10% 24% 35% 13% 2	740
	11th to 20th	Night	16% 14% 26% 33% 10% 1	760
	21st to end	Night	17% 15% 27% 31% 10% 1	760
December	1st to 10th	Night	19% 15% 31% 28% 7%	760
	11th to 20th	Night	16% 14% 29% 35% 6%	760
	21st to end	Night	16% 16% 28% 37% 4	836

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