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 2024-12-09.

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% 5% 5% 5% 4 6% 8% 41%	101226
	Night	13% 6% 2 6% 4 4 4 4 5% 7% 44%	98503
Transparency	Day	39% 6% 12% 24% 15% 4	104876
	Night	38% 5% 12% 24% 17% 4	102992
Seeing	Day	19% 13% 24% 24% 14% 6%	15112
	Night	16% 11% 24% 31% 15% 2	24961

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	15% 7% 2 5% 4 3 4 3 5% 6% 46%	2836
	11th to 20th	Day	10% 8% 3 9% 6% 5% 5% 3 4 5% 42%	2840
	21st to end	Day	14% 9% 3 8% 4 4 4 3 5% 6% 39%	3124
February	1st to 10th	Day	10% 8% 3 8% 5% 5% 5% 4 5% 6% 42%	1710
	11th to 20th	Day	14% 8% 2 6% 4 4 5% 4 6% 6% 41%	1663
	21st to end	Day	16% 8% 2 7% 6% 4 4 4 5% 5% 39%	1641
March	1st to 10th	Day	17% 10% 4 7% 4 3 4 3 4 6% 37%	3435
	11th to 20th	Day	9% 5% 2 5% 4 4 4 4 5% 7% 50%	3480
	21st to end	Day	16% 8% 3 7% 5% 5% 5% 4 5% 5% 37%	3815
April	1st to 10th	Day	8% 8% 2 6% 5% 4 5% 3 6% 8% 46%	2226
	11th to 20th	Day	11% 7% 2 5% 4 4 4 3 5% 7% 46%	2254
	21st to end	Day	15% 7% 2 7% 5% 5% 4 3 5% 6% 41%	2339
May	1st to 10th	Day	15% 7% 3 7% 6% 6% 6% 5% 7% 7% 31%	4082
	11th to 20th	Day	21% 7% 3 7% 5% 4 4 4 6% 7% 33%	4081
	21st to end	Day	10% 5% 2 5% 4 5% 5% 4 7% 11% 43%	4625
June	1st to 10th	Day	11% 5% 2 5% 4 5% 5% 5% 6% 9% 42%	2660
	11th to 20th	Day	10% 5% 2 6% 5% 6% 7% 5% 7% 10% 37%	2660
	21st to end	Day	7% 5% 2 6% 5% 5% 5% 5% 8% 10% 42%	2660
July	1st to 10th	Day	6% 4 2 6% 4 5% 6% 6% 9% 11% 41%	4132
	11th to 20th	Day	8% 5% 2 7% 5% 5% 6% 6% 8% 13% 34%	4120
	21st to end	Day	10% 7% 3 8% 7% 6% 7% 5% 8% 10% 28%	4466
August	1st to 10th	Day	13% 5% 2 7% 5% 6% 6% 5% 8% 10% 32%	4104
	11th to 20th	Day	9% 5% 2 6% 6% 6% 6% 5% 8% 11% 37%	3994
	21st to end	Day	7% 5% 2 6% 4 5% 5% 4 6% 10% 47%	4180
September	1st to 10th	Day	13% 6% 2 6% 4 4 5% 4 4 7% 47%	2280
	11th to 20th	Day	13% 6% 2 6% 4 4 5% 3 5% 8% 43%	2169
	21st to end	Day	22% 7% 2 6% 4 4 3 4 5% 7% 36%	2043
October	1st to 10th	Day	16% 5% 2 6% 4 3 3 3 5% 6% 47%	1900
	11th to 20th	Day	15% 5% 1 4 3 3 3 3 5% 6% 51%	1900
	21st to end	Day	12% 6% 2 5% 3 3 4 3 4 6% 52%	2090
November	1st to 10th	Day	11% 5% 2 4 4 3 3 3 5% 5% 55%	1957
	11th to 20th	Day	13% 6% 2 4 4 4 3 3 6% 6% 49%	1789
	21st to end	Day	12% 5% 2 5% 4 4 4 3 6% 6% 50%	1600
December	1st to 10th	Day	14% 8% 2 6% 4 4 4 3 6% 7% 41%	1584
	11th to 20th	Day	14% 6% 2 4 3 3 3 2 3 6% 53%	1910
	21st to end	Day	18% 7% 2 6% 4 4 4 4 6% 8% 36%	2877
January	1st to 10th	Night	11% 7% 2 5% 4 3 4 4 5% 6% 50%	4109
	11th to 20th	Night	13% 9% 3 6% 3 3 4 3 4 6% 48%	4120
	21st to end	Night	16% 10% 3 7% 4 3 3 3 4 5% 43%	4532
February	1st to 10th	Night	10% 8% 3 6% 4 4 5% 4 6% 7% 43%	2470
	11th to 20th	Night	17% 9% 3 5% 4 3 4 3 5% 6% 42%	2403
	21st to end	Night	13% 8% 2 6% 4 4 4 4 5% 7% 42%	1810
March	1st to 10th	Night	19% 7% 3 7% 5% 4 4 4 5% 6% 37%	3418
	11th to 20th	Night	10% 5% 2 5% 4 4 4 4 5% 7% 51%	3480
	21st to end	Night	13% 7% 3 5% 4 3 4 3 5% 5% 48%	3817
April	1st to 10th	Night	10% 7% 2 7% 5% 4 5% 3 6% 8% 43%	1952
	11th to 20th	Night	11% 6% 2 5% 4 3 4 4 5% 9% 48%	1875
	21st to end	Night	15% 6% 2 6% 4 4 5% 4 5% 7% 44%	1857
May	1st to 10th	Night	17% 7% 2 6% 4 5% 4 4 6% 8% 34%	2813
	11th to 20th	Night	23% 9% 2 6% 4 4 3 3 5% 7% 36%	2812
	21st to end	Night	11% 5% 1 6% 4 4 5% 4 7% 11% 44%	2925
June	1st to 10th	Night	9% 5% 2 5% 4 4 5% 5% 6% 11% 44%	1520
	11th to 20th	Night	9% 5% 2 5% 5% 4 6% 5% 7% 9% 44%	1520
	21st to end	Night	8% 5% 2 4 3 5% 5% 4 6% 11% 47%	1520
July	1st to 10th	Night	6% 4 2 5% 4 5% 5% 5% 8% 10% 46%	2822
	11th to 20th	Night	7% 6% 2 8% 6% 6% 5% 5% 7% 12% 37%	2840
	21st to end	Night	10% 7% 4 9% 6% 5% 6% 4 7% 9% 32%	3087
August	1st to 10th	Night	14% 6% 2 6% 6% 5% 5% 4 8% 9% 35%	2825
	11th to 20th	Night	8% 6% 3 9% 6% 6% 5% 4 7% 9% 36%	2803
	21st to end	Night	10% 7% 2 6% 4 4 4 3 6% 9% 45%	3476
September	1st to 10th	Night	12% 5% 2 5% 4 4 4 3 5% 7% 47%	1900
	11th to 20th	Night	13% 5% 2 5% 4 4 4 4 6% 8% 45%	2007
	21st to end	Night	22% 8% 2 6% 3 4 4 2 5% 5% 41%	2137
October	1st to 10th	Night	17% 5% 2 6% 4 3 4 2 5% 6% 45%	2280
	11th to 20th	Night	14% 5% 2 4 3 3 3 3 5% 6% 51%	2280
	21st to end	Night	12% 3 2 5% 3 3 3 3 5% 6% 53%	2508
November	1st to 10th	Night	10% 7% 2 5% 3 4 4 2 4 5% 53%	2341
	11th to 20th	Night	12% 6% 2 6% 3 4 4 3 4 6% 50%	2606
	21st to end	Night	12% 5% 2 5% 3 4 5% 4 5% 6% 50%	2800
December	1st to 10th	Night	13% 7% 2 7% 4 4 4 4 4 7% 43%	2779
	11th to 20th	Night	13% 7% 2 6% 4 4 4 3 4 6% 47%	3285
	21st to end	Night	14% 6% 2 6% 4 5% 5% 5% 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	39% 4 6% 29% 17% 5%	2837
	11th to 20th	Day	45% 5% 6% 19% 19% 6%	2840
	21st to end	Day	46% 3 7% 23% 17% 3	3124
February	1st to 10th	Day	43% 4 10% 24% 16% 3	1710
	11th to 20th	Day	42% 4 9% 21% 18% 5%	1672
	21st to end	Day	47% 3 10% 18% 17% 5%	1641
March	1st to 10th	Day	49% 4 8% 20% 13% 6%	3435
	11th to 20th	Day	33% 5% 8% 28% 20% 7%	3480
	21st to end	Day	48% 5% 10% 19% 15% 3	3815
April	1st to 10th	Day	36% 5% 11% 23% 18% 8%	2226
	11th to 20th	Day	36% 5% 12% 22% 20% 5%	2254
	21st to end	Day	44% 4 11% 24% 13% 4	2339
May	1st to 10th	Day	49% 6% 14% 20% 10% 1	4120
	11th to 20th	Day	49% 6% 12% 23% 9% 1	4085
	21st to end	Day	34% 6% 17% 23% 17% 2	4639
June	1st to 10th	Day	37% 7% 16% 25% 14% 1	2660
	11th to 20th	Day	39% 8% 16% 21% 13% 1	2660
	21st to end	Day	34% 9% 16% 27% 14% 1	2660
July	1st to 10th	Day	34% 10% 21% 20% 10% 5%	4067
	11th to 20th	Day	37% 9% 20% 25% 8% 1	4051
	21st to end	Day	48% 8% 13% 21% 9% 1	4324
August	1st to 10th	Day	43% 8% 19% 23% 6%	4091
	11th to 20th	Day	36% 9% 15% 29% 11% 1	4033
	21st to end	Day	32% 7% 19% 30% 10% 1	4180
September	1st to 10th	Day	38% 6% 14% 18% 20% 4	2280
	11th to 20th	Day	39% 6% 7% 27% 18% 3	2169
	21st to end	Day	47% 5% 10% 19% 17% 2	2043
October	1st to 10th	Day	33% 5% 8% 20% 29% 5%	3160
	11th to 20th	Day	24% 3 9% 27% 24% 13%	3140
	21st to end	Day	22% 2 10% 31% 23% 13%	3428
November	1st to 10th	Day	32% 4 9% 25% 26% 5%	1957
	11th to 20th	Day	35% 4 10% 21% 22% 8%	1789
	21st to end	Day	35% 4 9% 25% 24% 3	1600
December	1st to 10th	Day	43% 4 11% 22% 17% 4	1584
	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	34% 5% 8% 25% 24% 4	4109
	11th to 20th	Night	38% 3 7% 23% 23% 6%	4120
	21st to end	Night	45% 3 6% 25% 17% 4	4532
February	1st to 10th	Night	39% 5% 11% 25% 16% 3	2470
	11th to 20th	Night	43% 4 8% 20% 18% 6%	2405
	21st to end	Night	41% 4 12% 23% 15% 6%	1810
March	1st to 10th	Night	48% 5% 8% 22% 14% 4	3418
	11th to 20th	Night	31% 5% 6% 24% 28% 6%	3480
	21st to end	Night	39% 4 10% 24% 19% 4	3817
April	1st to 10th	Night	38% 6% 11% 19% 19% 6%	1952
	11th to 20th	Night	34% 4 16% 21% 21% 5%	1875
	21st to end	Night	40% 4 11% 27% 15% 4	1857
May	1st to 10th	Night	47% 5% 15% 20% 11% 2	2840
	11th to 20th	Night	49% 5% 12% 24% 9% 1	2813
	21st to end	Night	35% 6% 18% 26% 12% 3	2932
June	1st to 10th	Night	33% 9% 13% 31% 13% 1	1520
	11th to 20th	Night	35% 9% 16% 27% 12% 2	1520
	21st to end	Night	31% 8% 19% 23% 17% 3	1520
July	1st to 10th	Night	32% 10% 24% 18% 14% 2	2777
	11th to 20th	Night	38% 10% 20% 24% 8% 1	2786
	21st to end	Night	46% 9% 16% 20% 9%	2988
August	1st to 10th	Night	44% 7% 19% 24% 5% 1	2814
	11th to 20th	Night	41% 9% 16% 24% 11%	2830
	21st to end	Night	35% 6% 18% 32% 7% 2	3476
September	1st to 10th	Night	36% 6% 15% 20% 17% 5%	1900
	11th to 20th	Night	36% 6% 10% 27% 19% 3	2007
	21st to end	Night	46% 5% 9% 21% 16% 3	2137
October	1st to 10th	Night	42% 4 10% 20% 20% 5%	3800
	11th to 20th	Night	25% 3 8% 23% 29% 11%	3779
	21st to end	Night	20% 3 10% 31% 26% 11%	4120
November	1st to 10th	Night	34% 3 9% 22% 26% 6%	2341
	11th to 20th	Night	36% 3 8% 22% 24% 7%	2606
	21st to end	Night	35% 4 9% 25% 22% 5%	2800
December	1st to 10th	Night	42% 5% 9% 24% 17% 4	2779
	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	30% 29% 26% 14% 1	270
	21st to end	Day	27% 27% 32% 13% 2	297
February	1st to 10th	Day	25% 27% 34% 11% 2	270
	11th to 20th	Day	42% 23% 26% 8%	270
	21st to end	Day	34% 19% 26% 18% 2	353
March	1st to 10th	Day	25% 23% 26% 20% 5% 1	460
	11th to 20th	Day	25% 24% 28% 17% 5% 2	460
	21st to end	Day	22% 17% 33% 22% 5% 1	506
April	1st to 10th	Day	23% 24% 25% 17% 9% 1	460
	11th to 20th	Day	21% 16% 27% 22% 11% 4	452
	21st to end	Day	23% 17% 30% 20% 9% 2	460
May	1st to 10th	Day	21% 21% 27% 19% 8% 4	463
	11th to 20th	Day	22% 10% 27% 23% 14% 4	487
	21st to end	Day	18% 8% 22% 26% 19% 7%	529
June	1st to 10th	Day	14% 7% 27% 26% 19% 6%	490
	11th to 20th	Day	13% 7% 24% 28% 19% 9%	490
	21st to end	Day	10% 8% 26% 32% 17% 7%	490
July	1st to 10th	Day	11% 4 16% 32% 28% 10%	485
	11th to 20th	Day	6% 2 19% 36% 25% 12%	484
	21st to end	Day	12% 4 19% 32% 23% 10%	532
August	1st to 10th	Day	13% 5% 18% 27% 26% 12%	486
	11th to 20th	Day	12% 3 19% 28% 25% 12%	479
	21st to end	Day	10% 3 14% 32% 22% 18%	539
September	1st to 10th	Day	15% 5% 16% 25% 23% 17%	490
	11th to 20th	Day	16% 3 16% 28% 27% 10%	490
	21st to end	Day	28% 9% 18% 24% 17% 4	490
October	1st to 10th	Day	20% 7% 20% 30% 18% 6%	490
	11th to 20th	Day	17% 16% 23% 23% 19% 3	490
	21st to end	Day	14% 15% 32% 22% 14% 3	539
November	1st to 10th	Day	17% 11% 29% 28% 12% 3	495
	11th to 20th	Day	22% 13% 28% 25% 11% 1	341
	21st to end	Day	25% 19% 30% 19% 7% 2	200
December	1st to 10th	Day	24% 22% 32% 16% 5% 1	196
	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% 28% 3	760
	21st to end	Night	18% 20% 34% 26% 2	836
February	1st to 10th	Night	15% 19% 32% 31% 2	760
	11th to 20th	Night	23% 24% 32% 19% 1	743
	21st to end	Night	20% 19% 34% 25% 3	628
March	1st to 10th	Night	16% 21% 30% 29% 4	760
	11th to 20th	Night	25% 18% 29% 22% 6% 1	760
	21st to end	Night	19% 15% 32% 27% 6% 1	836
April	1st to 10th	Night	17% 20% 34% 22% 6%	760
	11th to 20th	Night	15% 16% 29% 29% 11% 1	751
	21st to end	Night	18% 10% 31% 31% 9% 1	717
May	1st to 10th	Night	20% 9% 24% 29% 17% 1	570
	11th to 20th	Night	19% 7% 22% 35% 16% 1	561
	21st to end	Night	16% 2 16% 38% 26% 3	527
June	1st to 10th	Night	8% 2 18% 49% 21% 2	380
	11th to 20th	Night	9% 4 15% 41% 29% 2	380
	21st to end	Night	10% 3 17% 45% 22% 2	380
July	1st to 10th	Night	10% 2 14% 32% 36% 6%	537
	11th to 20th	Night	6% 1 8% 36% 43% 5%	552
	21st to end	Night	9% 4 11% 39% 32% 6%	624
August	1st to 10th	Night	11% 2 10% 39% 33% 4	567
	11th to 20th	Night	13% 3 8% 37% 36% 4	569
	21st to end	Night	13% 3 9% 36% 35% 5%	836
September	1st to 10th	Night	15% 2 12% 34% 31% 6%	760
	11th to 20th	Night	14% 3 12% 34% 32% 5%	760
	21st to end	Night	25% 6% 16% 30% 21% 2	760
October	1st to 10th	Night	20% 6% 17% 31% 23% 3	760
	11th to 20th	Night	16% 11% 24% 32% 16% 1	760
	21st to end	Night	15% 10% 28% 32% 14% 2	836
November	1st to 10th	Night	14% 9% 24% 36% 13% 2	780
	11th to 20th	Night	16% 13% 27% 33% 10% 1	800
	21st to end	Night	17% 15% 28% 30% 10% 1	800
December	1st to 10th	Night	18% 15% 33% 27% 7%	795
	11th to 20th	Night	16% 14% 29% 35% 6%	760
	21st to end	Night	16% 16% 28% 37% 4	836

Page generated at 2024-12-06 03:54:53. Version ac07

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