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 2024-07-31.

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 6% 4 4 4 4 6% 8% 43%	89922
	Night	14% 7% 3 7% 4 4 4 3 5% 7% 42%	89866
Transparency	Day	38% 8% 13% 24% 15% 3	89681
	Night	41% 7% 12% 23% 15% 3	89711
Seeing	Day	15% 5% 19% 29% 25% 8%	14836
	Night	16% 7% 24% 31% 19% 3	24291

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% 3 6% 3 3 3 3 4 5% 46%	2521
	11th to 20th	Day	13% 8% 3 8% 4 3 4 3 5% 5% 44%	2840
	21st to end	Day	13% 10% 5% 9% 5% 4 4 4 4 6% 37%	3124
February	1st to 10th	Day	13% 9% 2 6% 5% 4 4 5% 6% 7% 38%	1710
	11th to 20th	Day	19% 7% 3 5% 3 3 4 3 5% 5% 43%	1829
	21st to end	Day	17% 8% 3 7% 5% 4 4 3 5% 5% 39%	1570
March	1st to 10th	Day	22% 10% 3 6% 3 3 4 3 4 6% 36%	3233
	11th to 20th	Day	10% 4 1 4 3 3 4 3 5% 7% 56%	3480
	21st to end	Day	18% 8% 2 6% 3 4 4 3 4 6% 42%	3991
April	1st to 10th	Day	12% 6% 2 5% 3 4 3 4 5% 8% 49%	2280
	11th to 20th	Day	10% 5% 2 4 4 3 4 3 6% 8% 50%	2254
	21st to end	Day	13% 6% 2 4 4 3 5% 4 5% 7% 48%	2280
May	1st to 10th	Day	15% 8% 3 7% 4 5% 5% 4 6% 8% 34%	3765
	11th to 20th	Day	19% 9% 3 8% 4 5% 4 3 5% 7% 33%	4345
	21st to end	Day	9% 4 2 5% 4 4 4 4 6% 11% 48%	4823
June	1st to 10th	Day	10% 5% 1 5% 4 3 5% 4 7% 11% 45%	2660
	11th to 20th	Day	9% 5% 2 4 3 4 4 5% 7% 11% 46%	2660
	21st to end	Day	7% 5% 2 5% 5% 4 5% 4 7% 11% 46%	2660
July	1st to 10th	Day	7% 5% 2 5% 5% 4 5% 4 8% 11% 44%	2660
	11th to 20th	Day	6% 4 2 5% 4 4 5% 6% 8% 12% 43%	2636
	21st to end	Day	8% 4 2 5% 5% 5% 6% 6% 9% 12% 38%	2679
August	1st to 10th	Day	9% 5% 2 6% 4 5% 5% 4 8% 11% 41%	2299
	11th to 20th	Day	11% 6% 2 6% 5% 5% 4 4 6% 10% 40%	2126
	21st to end	Day	10% 5% 2 6% 5% 4 5% 3 7% 11% 41%	2376
September	1st to 10th	Day	15% 5% 2 5% 4 4 4 3 7% 9% 43%	2160
	11th to 20th	Day	11% 6% 2 6% 4 3 5% 4 5% 7% 46%	2153
	21st to end	Day	18% 8% 3 6% 4 4 3 3 5% 7% 39%	1954
October	1st to 10th	Day	14% 6% 2 6% 5% 4 3 3 5% 6% 46%	1800
	11th to 20th	Day	15% 5% 2 5% 3 3 3 3 4 6% 50%	1800
	21st to end	Day	12% 7% 3 6% 5% 4 4 3 4 6% 46%	1980
November	1st to 10th	Day	13% 6% 3 6% 3 3 4 3 5% 7% 48%	1703
	11th to 20th	Day	12% 7% 2 5% 5% 3 4 4 4 7% 46%	1710
	21st to end	Day	16% 5% 2 5% 4 4 3 3 4 6% 47%	1659
December	1st to 10th	Day	16% 8% 3 6% 4 4 4 4 5% 7% 39%	1520
	11th to 20th	Day	15% 9% 3 6% 3 3 3 3 3 6% 47%	1910
	21st to end	Day	16% 7% 2 5% 5% 3 4 3 5% 6% 43%	2772
January	1st to 10th	Night	14% 8% 4 7% 4 4 4 4 4 6% 42%	4420
	11th to 20th	Night	16% 8% 4 9% 5% 4 4 3 4 5% 39%	4120
	21st to end	Night	17% 9% 3 10% 5% 4 4 3 4 4 37%	4532
February	1st to 10th	Night	16% 8% 3 6% 4 3 3 3 5% 6% 43%	2470
	11th to 20th	Night	19% 8% 2 5% 4 4 4 3 5% 6% 40%	2236
	21st to end	Night	18% 7% 3 5% 3 3 4 3 4 5% 45%	1884
March	1st to 10th	Night	23% 9% 3 6% 4 3 4 3 4 6% 35%	3616
	11th to 20th	Night	15% 6% 2 5% 3 3 4 3 4 6% 48%	3480
	21st to end	Night	18% 9% 3 5% 3 3 3 2 3 4 46%	3640
April	1st to 10th	Night	14% 8% 2 6% 5% 4 4 4 6% 7% 39%	1900
	11th to 20th	Night	12% 5% 2 4 4 4 3 3 5% 6% 51%	1875
	21st to end	Night	13% 6% 2 6% 4 5% 4 3 5% 9% 43%	1900
May	1st to 10th	Night	16% 8% 3 10% 4 5% 5% 4 6% 8% 32%	3130
	11th to 20th	Night	19% 9% 2 7% 5% 4 5% 3 5% 7% 34%	2576
	21st to end	Night	10% 6% 3 8% 4 4 5% 4 6% 8% 41%	2732
June	1st to 10th	Night	11% 7% 3 7% 5% 4 5% 4 7% 9% 39%	1520
	11th to 20th	Night	8% 5% 2 6% 5% 5% 6% 5% 8% 10% 41%	1520
	21st to end	Night	8% 6% 1 5% 4 5% 5% 5% 7% 9% 45%	1520
July	1st to 10th	Night	8% 5% 2 8% 5% 6% 5% 5% 7% 11% 39%	1520
	11th to 20th	Night	6% 5% 2 5% 4 5% 6% 5% 7% 10% 43%	1540
	21st to end	Night	8% 6% 2 7% 5% 6% 6% 5% 7% 10% 38%	1870
August	1st to 10th	Night	7% 6% 2 7% 6% 5% 6% 6% 8% 10% 37%	1619
	11th to 20th	Night	9% 7% 3 7% 5% 5% 4 4 6% 10% 40%	1774
	21st to end	Night	9% 5% 2 6% 5% 5% 5% 4 6% 11% 41%	1980
September	1st to 10th	Night	11% 6% 2 6% 5% 4 4 4 5% 7% 46%	1800
	11th to 20th	Night	10% 5% 3 7% 4 4 5% 3 6% 7% 47%	1805
	21st to end	Night	17% 7% 2 7% 4 6% 5% 3 5% 8% 35%	2003
October	1st to 10th	Night	14% 6% 2 5% 4 3 4 3 5% 7% 47%	2160
	11th to 20th	Night	16% 5% 1 6% 4 4 3 3 5% 6% 47%	2160
	21st to end	Night	16% 7% 3 5% 3 3 3 3 4 6% 46%	2376
November	1st to 10th	Night	13% 7% 2 7% 4 3 3 3 4 6% 47%	2372
	11th to 20th	Night	15% 8% 2 6% 4 3 3 3 5% 6% 44%	2470
	21st to end	Night	12% 6% 2 5% 4 3 4 3 5% 7% 49%	2517
December	1st to 10th	Night	17% 9% 3 7% 5% 5% 4 4 5% 6% 37%	2660
	11th to 20th	Night	17% 8% 3 7% 4 3 4 3 5% 7% 41%	3285
	21st to end	Night	13% 8% 2 6% 4 3 4 3 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	38% 6% 9% 30% 15% 2	2522
	11th to 20th	Day	41% 4 9% 21% 20% 4	2840
	21st to end	Day	47% 6% 11% 23% 13% 2	3124
February	1st to 10th	Day	42% 6% 12% 24% 12% 3	1710
	11th to 20th	Day	43% 4 9% 23% 17% 5%	1838
	21st to end	Day	46% 6% 11% 18% 14% 5%	1570
March	1st to 10th	Day	48% 6% 11% 19% 14% 3	3233
	11th to 20th	Day	26% 6% 11% 27% 24% 6%	3480
	21st to end	Day	43% 6% 10% 19% 18% 4	3991
April	1st to 10th	Day	34% 7% 12% 22% 20% 5%	2280
	11th to 20th	Day	32% 6% 12% 25% 20% 5%	2254
	21st to end	Day	35% 7% 12% 24% 17% 4	2280
May	1st to 10th	Day	46% 12% 13% 20% 8% 2	3800
	11th to 20th	Day	46% 9% 14% 23% 7% 1	4349
	21st to end	Day	30% 13% 16% 24% 15% 2	4837
June	1st to 10th	Day	31% 10% 16% 27% 14% 1	2660
	11th to 20th	Day	31% 8% 17% 28% 14% 2	2660
	21st to end	Day	31% 9% 17% 25% 17% 2	2660
July	1st to 10th	Day	32% 10% 18% 24% 14% 2	2590
	11th to 20th	Day	30% 11% 20% 28% 10% 1	2561
	21st to end	Day	33% 11% 17% 22% 16% 1	2537
August	1st to 10th	Day	34% 10% 19% 27% 10% 1	2286
	11th to 20th	Day	38% 9% 15% 25% 13%	2126
	21st to end	Day	35% 9% 14% 24% 15% 2	2376
September	1st to 10th	Day	37% 7% 17% 20% 17% 3	2160
	11th to 20th	Day	37% 6% 11% 24% 20% 2	2153
	21st to end	Day	45% 6% 9% 21% 17% 2	1954
October	1st to 10th	Day	39% 7% 9% 24% 18% 3	1800
	11th to 20th	Day	35% 5% 11% 27% 19% 3	1800
	21st to end	Day	39% 6% 8% 24% 19% 4	1980
November	1st to 10th	Day	37% 6% 10% 26% 17% 4	1703
	11th to 20th	Day	37% 6% 13% 19% 20% 5%	1710
	21st to end	Day	37% 6% 9% 27% 18% 3	1659
December	1st to 10th	Day	44% 6% 13% 22% 13% 2	1520
	11th to 20th	Day	40% 5% 9% 27% 15% 4	1906
	21st to end	Day	40% 7% 12% 27% 13% 1	2772
January	1st to 10th	Night	41% 4 10% 25% 16% 3	4420
	11th to 20th	Night	45% 6% 9% 23% 15% 1	4120
	21st to end	Night	49% 5% 9% 22% 13% 2	4532
February	1st to 10th	Night	42% 4 11% 25% 16% 2	2470
	11th to 20th	Night	45% 4 7% 23% 17% 4	2238
	21st to end	Night	42% 5% 8% 21% 18% 5%	1884
March	1st to 10th	Night	49% 5% 10% 21% 13% 2	3616
	11th to 20th	Night	36% 5% 8% 24% 22% 5%	3480
	21st to end	Night	42% 5% 7% 24% 16% 6%	3640
April	1st to 10th	Night	42% 6% 12% 17% 19% 4	1900
	11th to 20th	Night	34% 6% 11% 22% 22% 5%	1875
	21st to end	Night	38% 7% 12% 22% 17% 4	1900
May	1st to 10th	Night	48% 10% 12% 20% 9% 1	3160
	11th to 20th	Night	49% 7% 13% 23% 7% 1	2577
	21st to end	Night	37% 11% 14% 22% 15%	2739
June	1st to 10th	Night	40% 9% 13% 23% 14% 1	1520
	11th to 20th	Night	35% 10% 15% 23% 15% 1	1520
	21st to end	Night	33% 9% 17% 23% 15% 2	1520
July	1st to 10th	Night	37% 10% 18% 19% 13% 3	1480
	11th to 20th	Night	32% 11% 17% 28% 11% 1	1492
	21st to end	Night	36% 12% 15% 23% 13% 1	1771
August	1st to 10th	Night	37% 12% 19% 22% 10%	1608
	11th to 20th	Night	38% 10% 18% 20% 13%	1774
	21st to end	Night	36% 10% 16% 23% 12% 2	1980
September	1st to 10th	Night	36% 10% 15% 20% 16% 4	1800
	11th to 20th	Night	36% 7% 11% 26% 19% 2	1805
	21st to end	Night	46% 8% 11% 17% 16% 2	2003
October	1st to 10th	Night	37% 7% 11% 24% 18% 3	2160
	11th to 20th	Night	39% 4 9% 25% 20% 3	2160
	21st to end	Night	40% 4 9% 24% 19% 4	2376
November	1st to 10th	Night	38% 5% 12% 24% 17% 4	2372
	11th to 20th	Night	40% 6% 10% 20% 19% 5%	2470
	21st to end	Night	35% 5% 10% 27% 20% 3	2517
December	1st to 10th	Night	48% 6% 11% 20% 13% 2	2660
	11th to 20th	Night	43% 5% 10% 22% 16% 3	3288
	21st to end	Night	39% 5% 15% 27% 12% 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	17% 12% 33% 29% 10%	270
	21st to end	Day	18% 6% 28% 38% 10%	297
February	1st to 10th	Day	16% 9% 21% 40% 14%	270
	11th to 20th	Day	25% 10% 33% 26% 6%	437
	21st to end	Day	22% 8% 30% 30% 8% 1	382
March	1st to 10th	Day	17% 9% 29% 36% 9% 1	460
	11th to 20th	Day	15% 7% 30% 35% 11% 1	460
	21st to end	Day	14% 7% 28% 36% 13% 1	506
April	1st to 10th	Day	12% 9% 29% 33% 15% 2	460
	11th to 20th	Day	10% 3 24% 38% 21% 3	452
	21st to end	Day	15% 6% 22% 36% 20% 2	460
May	1st to 10th	Day	15% 6% 20% 33% 22% 4	463
	11th to 20th	Day	17% 2 19% 31% 24% 6%	487
	21st to end	Day	17% 1 11% 29% 30% 12%	529
June	1st to 10th	Day	12% 2 8% 30% 38% 10%	490
	11th to 20th	Day	9% 1 12% 31% 33% 13%	490
	21st to end	Day	8% 3 11% 30% 37% 10%	490
July	1st to 10th	Day	9% 2 6% 25% 39% 19%	485
	11th to 20th	Day	7% 1 7% 20% 46% 18%	484
	21st to end	Day	11% 1 8% 22% 47% 11%	529
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% 33% 27% 9%	760
	21st to end	Night	20% 11% 35% 30% 4	836
February	1st to 10th	Night	19% 8% 35% 31% 6% 1	760
	11th to 20th	Night	22% 13% 37% 24% 4	743
	21st to end	Night	21% 9% 31% 32% 5% 1	628
March	1st to 10th	Night	17% 10% 32% 32% 9%	760
	11th to 20th	Night	20% 8% 33% 29% 8% 2	760
	21st to end	Night	19% 7% 29% 35% 9% 1	836
April	1st to 10th	Night	17% 8% 34% 32% 8% 1	760
	11th to 20th	Night	14% 5% 26% 40% 14% 1	751
	21st to end	Night	15% 4 26% 40% 14% 1	760
May	1st to 10th	Night	17% 6% 25% 37% 14% 2	760
	11th to 20th	Night	16% 4 21% 37% 20% 2	429
	21st to end	Night	14% 2 13% 32% 33% 6%	411
June	1st to 10th	Night	13% 2 14% 37% 31% 3	380
	11th to 20th	Night	7% 1 12% 45% 29% 6%	380
	21st to end	Night	8% 2 14% 38% 34% 4	380
July	1st to 10th	Night	10% 8% 36% 38% 8%	370
	11th to 20th	Night	7% 1 6% 27% 49% 9%	388
	21st to end	Night	8% 3 11% 34% 38% 6%	624
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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