Cashville
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Cashville clear sky chart from 2005-11-06 to 2024-01-17.

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 4 5% 6% 8% 44%	74741
	Night	14% 6% 3 5% 5% 3 4 5% 5% 7% 43%	75084
Transparency	Day	24% 39% 9% 16% 10% 2	74451
	Night	26% 38% 8% 15% 11% 2	74893
Seeing	Day	15% 5% 18% 29% 25% 8%	14077
	Night	16% 7% 24% 31% 19% 3	23656

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% 7% 5% 7% 4 3 5% 4 5% 6% 40%	1521
	11th to 20th	Day	15% 6% 3 6% 5% 3 4 4 4 5% 44%	1674
	21st to end	Day	15% 7% 4 7% 5% 2 4 4 4 6% 43%	1782
February	1st to 10th	Day	14% 9% 2 5% 6% 3 4 6% 6% 8% 37%	1620
	11th to 20th	Day	20% 6% 3 5% 4 2 4 3 5% 5% 43%	1730
	21st to end	Day	17% 8% 3 6% 6% 3 4 4 5% 5% 38%	1480
March	1st to 10th	Day	15% 5% 2 4 4 2 3 4 4 6% 50%	1858
	11th to 20th	Day	17% 6% 2 4 5% 2 3 4 4 7% 45%	1980
	21st to end	Day	16% 5% 3 5% 5% 3 4 4 4 7% 43%	2271
April	1st to 10th	Day	12% 5% 3 5% 4 2 3 4 5% 8% 49%	2160
	11th to 20th	Day	10% 4 3 4 4 2 4 4 5% 8% 50%	2134
	21st to end	Day	13% 5% 2 4 4 2 5% 5% 5% 7% 48%	2160
May	1st to 10th	Day	13% 5% 3 4 4 3 5% 5% 6% 8% 44%	2160
	11th to 20th	Day	15% 6% 3 6% 4 3 4 4 5% 9% 41%	2439
	21st to end	Day	12% 5% 2 4 4 3 4 5% 6% 10% 45%	2725
June	1st to 10th	Day	10% 4 2 5% 4 2 5% 4 7% 11% 46%	2520
	11th to 20th	Day	9% 5% 2 4 4 3 4 6% 7% 10% 46%	2520
	21st to end	Day	7% 4 2 4 5% 3 6% 6% 7% 11% 45%	2520
July	1st to 10th	Day	8% 5% 2 4 5% 3 5% 5% 8% 11% 44%	2520
	11th to 20th	Day	6% 4 2 4 5% 3 5% 7% 7% 12% 45%	2498
	21st to end	Day	8% 3 3 4 5% 4 6% 7% 8% 13% 39%	2547
August	1st to 10th	Day	9% 5% 2 5% 5% 4 5% 6% 7% 11% 41%	2299
	11th to 20th	Day	11% 5% 3 5% 6% 4 5% 5% 6% 10% 41%	2126
	21st to end	Day	11% 5% 2 5% 6% 3 5% 5% 7% 11% 42%	2376
September	1st to 10th	Day	15% 5% 2 4 5% 3 4 4 7% 9% 43%	2160
	11th to 20th	Day	11% 6% 3 6% 5% 3 4 5% 5% 8% 46%	2153
	21st to end	Day	18% 8% 3 5% 5% 3 4 4 5% 8% 39%	1954
October	1st to 10th	Day	14% 6% 2 5% 6% 3 4 4 5% 6% 46%	1800
	11th to 20th	Day	16% 5% 2 4 4 2 3 4 4 6% 50%	1800
	21st to end	Day	12% 7% 3 6% 5% 3 4 5% 4 6% 46%	1980
November	1st to 10th	Day	13% 6% 3 5% 4 2 4 3 5% 7% 49%	1703
	11th to 20th	Day	13% 6% 2 5% 5% 2 5% 5% 4 7% 47%	1710
	21st to end	Day	16% 5% 2 5% 4 3 3 4 4 7% 47%	1659
December	1st to 10th	Day	16% 8% 3 5% 4 3 4 4 5% 7% 40%	1520
	11th to 20th	Day	15% 9% 3 5% 3 3 3 3 3 6% 48%	1910
	21st to end	Day	16% 7% 3 4 5% 3 4 4 5% 6% 43%	2772
January	1st to 10th	Night	14% 7% 4 6% 6% 3 5% 5% 4 6% 40%	2640
	11th to 20th	Night	16% 6% 3 7% 5% 4 5% 5% 4 7% 38%	2430
	21st to end	Night	17% 6% 3 5% 5% 3 3 4 4 5% 45%	2574
February	1st to 10th	Night	17% 8% 3 5% 4 2 4 4 5% 6% 42%	2340
	11th to 20th	Night	19% 8% 2 4 5% 2 4 4 5% 6% 40%	2115
	21st to end	Night	19% 6% 3 4 3 2 4 4 4 5% 45%	1776
March	1st to 10th	Night	15% 6% 2 4 4 3 3 4 4 6% 49%	2098
	11th to 20th	Night	19% 6% 2 4 4 3 5% 5% 5% 7% 40%	1980
	21st to end	Night	16% 7% 3 6% 4 3 4 4 4 6% 43%	2084
April	1st to 10th	Night	14% 7% 3 5% 6% 3 5% 5% 7% 7% 39%	1800
	11th to 20th	Night	12% 5% 2 4 4 3 4 4 5% 6% 51%	1775
	21st to end	Night	14% 5% 3 6% 4 3 4 4 5% 9% 44%	1800
May	1st to 10th	Night	14% 6% 3 6% 4 3 5% 5% 6% 9% 38%	1800
	11th to 20th	Night	13% 8% 3 5% 5% 3 4 5% 5% 8% 40%	1468
	21st to end	Night	13% 7% 2 5% 5% 3 5% 5% 6% 8% 40%	1550
June	1st to 10th	Night	11% 6% 3 6% 5% 3 4 5% 6% 10% 40%	1440
	11th to 20th	Night	8% 5% 2 5% 6% 4 6% 6% 7% 10% 40%	1440
	21st to end	Night	8% 5% 2 5% 5% 3 5% 6% 8% 10% 43%	1440
July	1st to 10th	Night	9% 4 2 6% 6% 4 5% 5% 7% 11% 40%	1440
	11th to 20th	Night	5% 5% 2 5% 5% 4 6% 7% 8% 10% 43%	1458
	21st to end	Night	7% 5% 3 6% 5% 3 6% 7% 7% 11% 40%	1771
August	1st to 10th	Night	7% 6% 2 6% 6% 4 5% 7% 8% 10% 37%	1619
	11th to 20th	Night	9% 6% 3 6% 5% 4 5% 5% 6% 10% 40%	1774
	21st to end	Night	9% 5% 2 5% 6% 3 6% 5% 6% 11% 41%	1980
September	1st to 10th	Night	11% 5% 2 6% 5% 3 4 5% 5% 7% 46%	1800
	11th to 20th	Night	10% 5% 3 6% 5% 3 4 4 5% 7% 47%	1805
	21st to end	Night	17% 7% 3 6% 5% 5% 5% 4 5% 8% 35%	2003
October	1st to 10th	Night	14% 6% 2 4 4 3 4 4 5% 8% 47%	2160
	11th to 20th	Night	16% 5% 2 5% 5% 3 3 4 4 6% 47%	2160
	21st to end	Night	16% 7% 3 5% 4 2 3 4 4 6% 46%	2376
November	1st to 10th	Night	14% 6% 2 6% 5% 3 3 4 4 6% 47%	2372
	11th to 20th	Night	15% 7% 3 6% 4 3 4 4 5% 6% 44%	2470
	21st to end	Night	12% 5% 2 5% 5% 2 5% 4 5% 7% 49%	2517
December	1st to 10th	Night	17% 8% 3 6% 5% 3 5% 4 4 6% 37%	2660
	11th to 20th	Night	18% 7% 3 6% 5% 2 4 3 5% 6% 41%	3285
	21st to end	Night	13% 8% 3 5% 5% 2 4 4 6% 8% 42%	4884

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	26% 41% 7% 17% 7% 1	1522
	11th to 20th	Day	27% 40% 7% 15% 9% 2	1674
	21st to end	Day	27% 38% 8% 15% 11% 2	1782
February	1st to 10th	Day	28% 37% 8% 15% 10% 2	1620
	11th to 20th	Day	26% 37% 6% 16% 12% 3	1739
	21st to end	Day	31% 37% 7% 14% 9% 3	1480
March	1st to 10th	Day	21% 36% 8% 20% 12% 2	1858
	11th to 20th	Day	25% 38% 9% 14% 11% 3	1980
	21st to end	Day	28% 38% 8% 15% 10% 1	2271
April	1st to 10th	Day	21% 38% 10% 14% 13% 4	2160
	11th to 20th	Day	21% 36% 9% 16% 14% 4	2134
	21st to end	Day	23% 37% 8% 17% 12% 2	2160
May	1st to 10th	Day	24% 40% 10% 15% 10% 1	2160
	11th to 20th	Day	26% 40% 9% 15% 8% 2	2443
	21st to end	Day	21% 40% 11% 18% 9%	2725
June	1st to 10th	Day	19% 39% 12% 19% 9% 1	2520
	11th to 20th	Day	22% 39% 12% 18% 7% 2	2520
	21st to end	Day	22% 40% 11% 15% 11% 1	2520
July	1st to 10th	Day	20% 41% 12% 16% 10% 1	2450
	11th to 20th	Day	19% 43% 12% 18% 7% 1	2423
	21st to end	Day	21% 42% 14% 14% 9%	2405
August	1st to 10th	Day	22% 40% 12% 19% 7% 1	2286
	11th to 20th	Day	26% 39% 10% 16% 9%	2126
	21st to end	Day	26% 40% 10% 15% 8% 2	2376
September	1st to 10th	Day	23% 39% 10% 13% 13% 3	2160
	11th to 20th	Day	24% 37% 6% 18% 14% 1	2153
	21st to end	Day	29% 38% 7% 11% 13% 2	1954
October	1st to 10th	Day	26% 36% 6% 15% 15% 2	1800
	11th to 20th	Day	24% 37% 7% 16% 14% 2	1800
	21st to end	Day	26% 38% 6% 16% 11% 2	1980
November	1st to 10th	Day	21% 42% 7% 17% 12% 2	1703
	11th to 20th	Day	22% 42% 10% 12% 12% 2	1710
	21st to end	Day	24% 40% 7% 15% 11% 2	1659
December	1st to 10th	Day	23% 42% 10% 16% 9% 1	1520
	11th to 20th	Day	29% 33% 7% 19% 10% 3	1906
	21st to end	Day	29% 28% 10% 23% 10% 1	2772
January	1st to 10th	Night	27% 41% 8% 15% 8% 1	2640
	11th to 20th	Night	29% 42% 7% 13% 9% 1	2430
	21st to end	Night	28% 37% 7% 16% 11% 1	2574
February	1st to 10th	Night	28% 36% 6% 16% 12% 2	2340
	11th to 20th	Night	28% 37% 5% 16% 10% 4	2117
	21st to end	Night	29% 36% 6% 13% 13% 3	1776
March	1st to 10th	Night	22% 37% 7% 20% 13% 2	2098
	11th to 20th	Night	29% 38% 6% 14% 10% 3	1980
	21st to end	Night	29% 37% 7% 15% 9% 3	2084
April	1st to 10th	Night	27% 38% 9% 12% 12% 3	1800
	11th to 20th	Night	22% 37% 8% 13% 16% 4	1775
	21st to end	Night	24% 38% 8% 16% 12% 3	1800
May	1st to 10th	Night	26% 39% 10% 15% 9% 2	1800
	11th to 20th	Night	28% 40% 9% 13% 9% 1	1469
	21st to end	Night	25% 41% 11% 15% 8%	1551
June	1st to 10th	Night	24% 39% 10% 17% 9%	1440
	11th to 20th	Night	25% 41% 11% 14% 8% 1	1440
	21st to end	Night	25% 40% 11% 14% 9% 1	1440
July	1st to 10th	Night	23% 44% 11% 13% 8% 1	1400
	11th to 20th	Night	20% 41% 14% 16% 8% 1	1410
	21st to end	Night	23% 43% 11% 14% 8%	1672
August	1st to 10th	Night	23% 42% 13% 16% 5%	1608
	11th to 20th	Night	29% 40% 11% 12% 9%	1774
	21st to end	Night	27% 41% 12% 12% 7% 1	1980
September	1st to 10th	Night	24% 38% 8% 13% 14% 3	1800
	11th to 20th	Night	23% 38% 6% 18% 13% 1	1805
	21st to end	Night	30% 39% 7% 10% 13% 2	2003
October	1st to 10th	Night	24% 37% 7% 16% 14% 2	2160
	11th to 20th	Night	28% 37% 5% 16% 13% 2	2160
	21st to end	Night	26% 37% 6% 17% 12% 2	2376
November	1st to 10th	Night	20% 42% 7% 17% 11% 2	2372
	11th to 20th	Night	25% 41% 7% 13% 11% 2	2470
	21st to end	Night	24% 40% 7% 16% 12% 2	2517
December	1st to 10th	Night	26% 41% 8% 14% 10% 1	2660
	11th to 20th	Night	31% 33% 8% 14% 13% 2	3288
	21st to end	Night	28% 28% 12% 22% 9% 1	4884

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	18% 10% 29% 34% 9%	182
	11th to 20th	Day	16% 12% 33% 29% 10%	258
	21st to end	Day	20% 6% 29% 36% 9%	264
February	1st to 10th	Day	17% 10% 22% 40% 12%	240
	11th to 20th	Day	26% 10% 32% 26% 6%	398
	21st to end	Day	23% 8% 31% 29% 8% 1	346
March	1st to 10th	Day	15% 9% 30% 36% 9%	420
	11th to 20th	Day	17% 8% 29% 34% 11% 1	420
	21st to end	Day	14% 8% 28% 35% 14% 1	462
April	1st to 10th	Day	13% 9% 29% 31% 15% 2	420
	11th to 20th	Day	10% 3 24% 39% 20% 3	412
	21st to end	Day	14% 6% 22% 36% 20% 1	420
May	1st to 10th	Day	15% 6% 20% 34% 21% 4	423
	11th to 20th	Day	18% 2 19% 30% 25% 6%	447
	21st to end	Day	18% 1 12% 27% 30% 12%	485
June	1st to 10th	Day	12% 2 8% 30% 37% 11%	450
	11th to 20th	Day	10% 1 12% 29% 34% 14%	450
	21st to end	Day	8% 2 9% 31% 39% 11%	450
July	1st to 10th	Day	10% 2 6% 22% 40% 20%	445
	11th to 20th	Day	7% 1 4 19% 50% 20%	444
	21st to end	Day	10% 1 6% 22% 50% 12%	488
August	1st to 10th	Day	10% 1 5% 29% 40% 15%	446
	11th to 20th	Day	11% 8% 22% 38% 21%	439
	21st to end	Day	10% 1 9% 25% 37% 18%	495
September	1st to 10th	Day	14% 2 8% 23% 35% 19%	450
	11th to 20th	Day	12% 2 12% 23% 36% 14%	450
	21st to end	Day	22% 4 16% 25% 25% 8%	450
October	1st to 10th	Day	16% 4 12% 28% 28% 11%	450
	11th to 20th	Day	17% 5% 19% 28% 24% 6%	450
	21st to end	Day	15% 7% 25% 28% 20% 5%	495
November	1st to 10th	Day	16% 7% 25% 25% 21% 6%	381
	11th to 20th	Day	15% 9% 28% 30% 15% 2	370
	21st to end	Day	18% 12% 24% 23% 19% 4	319
December	1st to 10th	Day	22% 8% 24% 31% 13% 2	180
	11th to 20th	Day	21% 9% 27% 26% 17%	180
	21st to end	Day	19% 7% 27% 30% 15% 2	198
January	1st to 10th	Night	17% 16% 33% 28% 7%	760
	11th to 20th	Night	18% 13% 32% 28% 9%	748
	21st to end	Night	20% 11% 35% 29% 4	792
February	1st to 10th	Night	20% 8% 36% 29% 5% 1	720
	11th to 20th	Night	22% 13% 37% 24% 4	703
	21st to end	Night	21% 10% 31% 32% 5% 1	592
March	1st to 10th	Night	16% 10% 33% 32% 8%	720
	11th to 20th	Night	21% 7% 32% 30% 8% 2	720
	21st to end	Night	19% 7% 29% 35% 9% 1	792
April	1st to 10th	Night	17% 7% 34% 32% 9% 1	720
	11th to 20th	Night	14% 4 26% 40% 14% 1	711
	21st to end	Night	16% 4 27% 39% 14% 1	720
May	1st to 10th	Night	17% 6% 26% 37% 13% 2	720
	11th to 20th	Night	15% 4 21% 38% 20% 2	407
	21st to end	Night	14% 2 13% 30% 34% 6%	389
June	1st to 10th	Night	14% 2 14% 37% 30% 3	360
	11th to 20th	Night	8% 1 13% 43% 30% 6%	360
	21st to end	Night	8% 1 13% 37% 36% 4	360
July	1st to 10th	Night	10% 9% 36% 37% 9%	350
	11th to 20th	Night	7% 1 5% 26% 51% 9%	366
	21st to end	Night	7% 3 10% 33% 40% 7%	591
August	1st to 10th	Night	9% 8% 34% 41% 7%	545
	11th to 20th	Night	13% 1 9% 31% 39% 8%	710
	21st to end	Night	9% 1 10% 29% 40% 11%	792
September	1st to 10th	Night	13% 2 10% 27% 36% 12%	720
	11th to 20th	Night	11% 2 13% 26% 38% 10%	720
	21st to end	Night	21% 3 15% 30% 28% 4	720
October	1st to 10th	Night	18% 5% 15% 28% 26% 8%	720
	11th to 20th	Night	17% 6% 22% 31% 21% 3	720
	21st to end	Night	18% 9% 23% 29% 17% 4	792
November	1st to 10th	Night	16% 8% 24% 29% 17% 6%	740
	11th to 20th	Night	17% 10% 26% 31% 13% 2	760
	21st to end	Night	14% 12% 27% 29% 16% 2	760
December	1st to 10th	Night	22% 9% 34% 23% 11% 1	760
	11th to 20th	Night	18% 10% 36% 27% 9%	760
	21st to end	Night	18% 11% 29% 31% 11%	836

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