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 2025-01-07.

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% 7% 2 6% 4 4 4 4 6% 8% 43%	104722
	Night	14% 7% 3 7% 4 4 4 4 5% 7% 42%	104270
Transparency	Day	37% 8% 14% 24% 16% 3	108355
	Night	40% 7% 12% 23% 16% 3	108776
Seeing	Day	14% 5% 19% 29% 25% 8%	15369
	Night	16% 7% 24% 31% 19% 3	24919

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 4 3 4 5% 46%	2569
	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	6% 4 1 5% 4 4 5% 4 8% 13% 45%	4440
	11th to 20th	Day	11% 6% 3 6% 4 4 5% 5% 7% 10% 39%	4390
	21st to end	Day	9% 6% 3 6% 6% 5% 7% 5% 9% 11% 34%	4466
August	1st to 10th	Day	14% 8% 2 7% 4 5% 4 5% 8% 10% 32%	4049
	11th to 20th	Day	9% 6% 3 6% 5% 6% 5% 4 6% 10% 40%	3730
	21st to end	Day	9% 4 2 5% 4 4 5% 3 7% 11% 47%	4180
September	1st to 10th	Day	14% 5% 2 5% 4 4 4 3 7% 8% 43%	2280
	11th to 20th	Day	11% 6% 3 6% 4 3 5% 4 5% 7% 45%	2272
	21st to end	Day	19% 8% 3 6% 4 4 3 3 5% 7% 38%	2062
October	1st to 10th	Day	14% 6% 2 6% 5% 4 4 3 5% 6% 46%	1900
	11th to 20th	Day	15% 5% 2 4 3 3 3 3 4 5% 52%	1900
	21st to end	Day	12% 7% 3 6% 5% 4 4 3 4 6% 48%	2090
November	1st to 10th	Day	13% 6% 3 6% 3 3 4 3 5% 8% 48%	1794
	11th to 20th	Day	12% 7% 2 5% 4 3 4 4 4 7% 46%	1800
	21st to end	Day	16% 5% 2 5% 4 4 3 3 4 6% 48%	1746
December	1st to 10th	Day	11% 8% 3 6% 3 4 4 3 4 6% 49%	2600
	11th to 20th	Day	17% 10% 3 7% 3 3 2 2 3 5% 45%	2990
	21st to end	Day	12% 7% 2 5% 4 4 4 3 6% 8% 46%	3960
January	1st to 10th	Night	13% 8% 4 7% 4 4 4 4 4 6% 42%	4505
	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 7% 5% 6% 5% 5% 7% 11% 38%	2520
	11th to 20th	Night	8% 7% 2 7% 4 5% 5% 5% 7% 11% 37%	2566
	21st to end	Night	12% 9% 3 8% 5% 5% 5% 5% 7% 8% 33%	3087
August	1st to 10th	Night	15% 9% 3 8% 5% 4 5% 4 7% 9% 31%	2847
	11th to 20th	Night	9% 7% 3 7% 5% 5% 4 4 6% 9% 40%	3097
	21st to end	Night	8% 5% 2 6% 4 4 4 4 5% 10% 48%	3476
September	1st to 10th	Night	10% 6% 2 6% 5% 4 4 4 5% 7% 46%	1900
	11th to 20th	Night	10% 5% 3 7% 4 4 5% 3 6% 7% 46%	1906
	21st to end	Night	18% 8% 3 7% 4 5% 5% 3 5% 8% 35%	2115
October	1st to 10th	Night	14% 6% 2 5% 4 4 4 3 5% 7% 47%	2280
	11th to 20th	Night	15% 5% 1 5% 4 4 4 3 4 6% 48%	2280
	21st to end	Night	15% 6% 3 5% 3 3 3 3 4 6% 48%	2508
November	1st to 10th	Night	13% 7% 2 7% 4 3 4 3 4 6% 47%	2501
	11th to 20th	Night	15% 8% 2 6% 4 4 3 3 5% 6% 43%	2600
	21st to end	Night	12% 6% 2 6% 4 3 4 3 5% 7% 49%	2650
December	1st to 10th	Night	10% 6% 2 5% 4 4 4 3 6% 6% 49%	4580
	11th to 20th	Night	18% 9% 3 7% 5% 4 5% 3 5% 6% 36%	5205
	21st to end	Night	11% 8% 3 7% 4 3 4 3 5% 7% 44%	6996

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% 29% 16% 2	2570
	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	29% 12% 26% 20% 11% 2	4370
	11th to 20th	Day	38% 9% 24% 22% 6% 1	4315
	21st to end	Day	39% 12% 16% 19% 13% 1	4324
August	1st to 10th	Day	42% 9% 19% 23% 6%	4036
	11th to 20th	Day	36% 10% 16% 29% 10%	3766
	21st to end	Day	28% 8% 15% 29% 18% 1	4180
September	1st to 10th	Day	37% 7% 16% 19% 18% 3	2280
	11th to 20th	Day	37% 7% 11% 25% 19% 1	2272
	21st to end	Day	46% 6% 8% 20% 17% 2	2062
October	1st to 10th	Day	30% 7% 11% 24% 23% 5%	3160
	11th to 20th	Day	25% 4 9% 22% 33% 7%	3140
	21st to end	Day	25% 4 10% 28% 25% 8%	3428
November	1st to 10th	Day	36% 6% 11% 26% 17% 4	1794
	11th to 20th	Day	38% 6% 12% 19% 20% 5%	1800
	21st to end	Day	37% 6% 9% 27% 19% 3	1746
December	1st to 10th	Day	37% 6% 11% 29% 16% 2	2600
	11th to 20th	Day	43% 4 13% 21% 15% 3	2986
	21st to end	Day	35% 6% 14% 28% 15% 1	3960
January	1st to 10th	Night	41% 4 10% 25% 16% 3	4505
	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	38% 13% 17% 19% 10% 2	2480
	11th to 20th	Night	38% 10% 22% 23% 6% 1	2518
	21st to end	Night	46% 11% 13% 18% 12%	2988
August	1st to 10th	Night	47% 9% 17% 21% 6%	2836
	11th to 20th	Night	38% 9% 16% 25% 11%	3127
	21st to end	Night	31% 8% 11% 26% 23% 1	3476
September	1st to 10th	Night	36% 9% 14% 19% 17% 4	1900
	11th to 20th	Night	36% 7% 10% 26% 18% 2	1906
	21st to end	Night	47% 8% 11% 17% 15% 2	2115
October	1st to 10th	Night	34% 6% 12% 24% 21% 2	3800
	11th to 20th	Night	27% 4 8% 23% 28% 10%	3779
	21st to end	Night	24% 3 8% 31% 24% 11%	4120
November	1st to 10th	Night	38% 5% 12% 24% 18% 4	2501
	11th to 20th	Night	41% 6% 10% 20% 18% 5%	2600
	21st to end	Night	34% 5% 10% 28% 20% 3	2650
December	1st to 10th	Night	34% 6% 11% 27% 20% 3	4580
	11th to 20th	Night	48% 6% 11% 20% 11% 4	5208
	21st to end	Night	39% 5% 14% 27% 13% 1	6996

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	20% 11% 28% 31% 9%	194
	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% 23% 47% 11%	532
August	1st to 10th	Day	12% 2 7% 29% 37% 14%	486
	11th to 20th	Day	10% 1 10% 23% 35% 20%	479
	21st to end	Day	10% 1 10% 24% 37% 17%	539
September	1st to 10th	Day	14% 2 10% 24% 33% 17%	490
	11th to 20th	Day	12% 3 14% 23% 34% 13%	490
	21st to end	Day	22% 6% 17% 24% 24% 7%	490
October	1st to 10th	Day	15% 5% 13% 28% 28% 11%	490
	11th to 20th	Day	17% 7% 20% 27% 24% 6%	490
	21st to end	Day	14% 7% 25% 28% 20% 6%	539
November	1st to 10th	Day	15% 8% 26% 25% 20% 6%	412
	11th to 20th	Day	15% 12% 30% 28% 14% 2	400
	21st to end	Day	18% 14% 23% 23% 18% 4	346
December	1st to 10th	Day	22% 9% 28% 29% 12% 2	200
	11th to 20th	Day	22% 10% 29% 24% 16%	200
	21st to end	Day	18% 9% 28% 30% 13% 2	220
January	1st to 10th	Night	17% 17% 33% 27% 6%	785
	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	7% 3 11% 34% 38% 6%	624
August	1st to 10th	Night	10% 2 9% 33% 40% 7%	576
	11th to 20th	Night	12% 1 10% 31% 38% 8%	750
	21st to end	Night	9% 1 9% 30% 40% 11%	836
September	1st to 10th	Night	12% 2 12% 28% 35% 11%	760
	11th to 20th	Night	12% 3 13% 26% 37% 9%	760
	21st to end	Night	21% 3 15% 29% 28% 3	760
October	1st to 10th	Night	18% 5% 16% 29% 26% 7%	760
	11th to 20th	Night	17% 7% 22% 31% 21% 3	760
	21st to end	Night	17% 9% 23% 29% 17% 4	836
November	1st to 10th	Night	16% 9% 24% 29% 18% 5%	780
	11th to 20th	Night	17% 10% 27% 31% 13% 2	800
	21st to end	Night	15% 13% 27% 29% 15% 2	800
December	1st to 10th	Night	22% 9% 35% 22% 11% 1	800
	11th to 20th	Night	18% 10% 36% 27% 9%	800
	21st to end	Night	18% 11% 30% 31% 11%	880

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