Batesville
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Batesville clear sky chart from 2005-11-06 to 2026-06-16.

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	12% 6% 2 6% 4 4 4 4 5% 7% 46%	137046
	Night	13% 6% 2 6% 4 3 4 3 5% 7% 49%	135220
Transparency	Day	37% 4 10% 26% 19% 4	140652
	Night	35% 3 10% 25% 21% 6%	139695
Seeing	Day	15% 11% 25% 25% 18% 6%	17568
	Night	16% 10% 26% 31% 16% 2	27388

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	13% 8% 3 6% 5% 4 3 3 4 5% 46%	5289
	11th to 20th	Day	9% 7% 2 6% 3 3 3 2 3 4 58%	5310
	21st to end	Day	19% 6% 2 5% 3 2 3 2 3 5% 50%	5812
February	1st to 10th	Day	18% 7% 3 7% 4 3 4 2 4 5% 43%	1890
	11th to 20th	Day	15% 8% 2 7% 5% 4 4 3 5% 5% 42%	2022
	21st to end	Day	15% 9% 3 7% 5% 4 3 3 6% 6% 40%	1730
March	1st to 10th	Day	19% 10% 3 6% 4 4 4 4 5% 5% 38%	4971
	11th to 20th	Day	10% 5% 2 5% 3 3 4 3 5% 6% 54%	5090
	21st to end	Day	13% 8% 2 8% 4 3 4 3 5% 7% 43%	5712
April	1st to 10th	Day	13% 6% 2 6% 4 3 4 3 6% 7% 46%	2520
	11th to 20th	Day	14% 7% 2 6% 4 4 4 3 6% 6% 43%	2494
	21st to end	Day	16% 7% 2 7% 5% 4 4 4 6% 6% 38%	2520
May	1st to 10th	Day	13% 8% 3 7% 5% 4 4 4 6% 7% 38%	7021
	11th to 20th	Day	13% 7% 2 7% 5% 5% 5% 4 7% 8% 38%	7443
	21st to end	Day	20% 8% 3 8% 5% 5% 5% 4 6% 7% 28%	9006
June	1st to 10th	Day	7% 6% 2 6% 5% 5% 6% 5% 8% 9% 42%	2940
	11th to 20th	Day	5% 3 2 5% 5% 5% 6% 5% 7% 11% 46%	2871
	21st to end	Day	4 4 2 4 5% 4 5% 5% 7% 10% 51%	2800
July	1st to 10th	Day	7% 5% 2 6% 5% 5% 5% 4 7% 10% 43%	6142
	11th to 20th	Day	4 3 1 4 3 4 5% 4 7% 10% 55%	5900
	21st to end	Day	7% 6% 2 7% 5% 5% 5% 4 7% 10% 43%	6422
August	1st to 10th	Day	4 2 1 4 3 3 4 3 5% 9% 62%	4205
	11th to 20th	Day	9% 6% 2 6% 4 4 5% 4 6% 9% 45%	3849
	21st to end	Day	6% 4 1 4 4 4 4 4 6% 9% 55%	4312
September	1st to 10th	Day	10% 5% 2 5% 4 4 5% 5% 6% 7% 47%	2400
	11th to 20th	Day	13% 4 2 6% 3 5% 4 4 6% 8% 46%	2400
	21st to end	Day	10% 4 2 5% 4 4 4 3 4 6% 55%	2129
October	1st to 10th	Day	7% 4 2 4 3 4 3 3 5% 6% 58%	2000
	11th to 20th	Day	13% 5% 2 3 3 3 3 2 4 4 59%	2000
	21st to end	Day	19% 5% 2 4 3 3 3 3 4 5% 49%	2200
November	1st to 10th	Day	12% 6% 2 5% 3 3 2 2 4 6% 56%	2039
	11th to 20th	Day	10% 5% 2 5% 4 3 3 3 5% 7% 53%	1890
	21st to end	Day	19% 7% 3 5% 3 2 3 2 4 5% 47%	1869
December	1st to 10th	Day	13% 6% 2 7% 4 3 3 3 3 4 52%	2690
	11th to 20th	Day	16% 7% 2 7% 3 4 3 3 4 6% 46%	3088
	21st to end	Day	18% 9% 4 8% 4 4 4 4 6% 5% 36%	4070
January	1st to 10th	Night	16% 7% 2 6% 3 3 3 3 3 5% 47%	7634
	11th to 20th	Night	10% 5% 2 5% 2 2 3 2 3 4 62%	7680
	21st to end	Night	20% 8% 3 6% 3 3 3 2 3 5% 44%	8402
February	1st to 10th	Night	18% 8% 3 6% 4 3 3 3 3 6% 44%	2730
	11th to 20th	Night	17% 7% 2 6% 4 4 3 3 4 5% 45%	2483
	21st to end	Night	16% 6% 2 6% 4 4 3 3 4 5% 47%	2076
March	1st to 10th	Night	17% 8% 3 7% 4 3 4 3 4 4 44%	5133
	11th to 20th	Night	11% 6% 2 6% 3 4 4 3 5% 6% 52%	5090
	21st to end	Night	11% 6% 3 6% 4 4 4 4 5% 7% 46%	5458
April	1st to 10th	Night	11% 6% 2 5% 4 4 4 4 3 7% 50%	2100
	11th to 20th	Night	13% 4 2 4 4 3 3 3 5% 7% 50%	2075
	21st to end	Night	14% 6% 2 5% 5% 4 5% 3 5% 8% 44%	2100
May	1st to 10th	Night	16% 7% 3 7% 4 4 4 4 5% 7% 39%	5832
	11th to 20th	Night	15% 8% 3 8% 4 4 5% 3 5% 6% 39%	5436
	21st to end	Night	21% 9% 3 7% 5% 4 4 3 6% 7% 30%	5162
June	1st to 10th	Night	5% 4 2 6% 4 3 5% 4 7% 10% 50%	1680
	11th to 20th	Night	3 3 1 4 6% 3 4 3 6% 9% 58%	1640
	21st to end	Night	3 3 1 3 4 3 4 4 6% 11% 58%	1600
July	1st to 10th	Night	6% 4 2 6% 4 5% 5% 5% 7% 10% 47%	3816
	11th to 20th	Night	4 2 1 3 3 3 4 3 6% 11% 59%	4077
	21st to end	Night	6% 6% 3 6% 4 4 4 4 6% 8% 49%	4449
August	1st to 10th	Night	2 2 1 4 2 3 4 3 6% 8% 65%	2952
	11th to 20th	Night	4 3 1 6% 4 4 5% 4 7% 10% 53%	3200
	21st to end	Night	4 2 2 4 3 3 4 3 6% 9% 58%	3586
September	1st to 10th	Night	8% 5% 1 4 4 4 4 4 5% 7% 55%	2000
	11th to 20th	Night	10% 6% 2 5% 3 4 3 3 4 7% 52%	2000
	21st to end	Night	8% 5% 2 5% 3 3 4 3 4 6% 58%	2245
October	1st to 10th	Night	7% 3 1 3 2 3 3 3 5% 7% 62%	2400
	11th to 20th	Night	12% 4 1 4 3 3 3 2 4 4 62%	2400
	21st to end	Night	17% 5% 2 5% 3 2 3 2 3 4 53%	2640
November	1st to 10th	Night	12% 6% 2 4 2 3 2 3 4 5% 58%	2476
	11th to 20th	Night	10% 4 1 4 2 4 3 3 4 6% 58%	2730
	21st to end	Night	14% 5% 2 4 3 3 4 3 5% 7% 49%	2747
December	1st to 10th	Night	14% 6% 2 5% 3 3 3 2 4 6% 52%	4720
	11th to 20th	Night	15% 7% 3 7% 3 3 3 2 4 5% 47%	5339
	21st to end	Night	21% 8% 2 7% 4 4 4 3 4 5% 38%	7132

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	42% 2 8% 30% 16% 2	5290
	11th to 20th	Day	32% 2 6% 25% 31% 5%	5310
	21st to end	Day	40% 2 6% 20% 25% 7%	5812
February	1st to 10th	Day	46% 3 9% 24% 16% 3	1890
	11th to 20th	Day	45% 4 9% 20% 18% 5%	2032
	21st to end	Day	45% 2 8% 19% 17% 8%	1730
March	1st to 10th	Day	50% 2 6% 18% 13% 12%	4971
	11th to 20th	Day	32% 2 7% 24% 22% 12%	5090
	21st to end	Day	42% 3 9% 27% 19% 1	5714
April	1st to 10th	Day	38% 4 9% 26% 21% 3	2520
	11th to 20th	Day	41% 3 10% 23% 16% 7%	2494
	21st to end	Day	45% 4 11% 23% 17% 2	2520
May	1st to 10th	Day	46% 4 10% 21% 17% 3	7056
	11th to 20th	Day	43% 5% 13% 23% 14% 3	7447
	21st to end	Day	53% 5% 11% 17% 12% 1	9020
June	1st to 10th	Day	36% 6% 14% 26% 18% 1	2940
	11th to 20th	Day	29% 6% 15% 30% 17% 4	2871
	21st to end	Day	26% 6% 16% 29% 20% 4	2800
July	1st to 10th	Day	34% 6% 13% 27% 18% 1	6077
	11th to 20th	Day	23% 6% 14% 39% 15% 2	5831
	21st to end	Day	35% 7% 14% 33% 11% 1	6240
August	1st to 10th	Day	20% 4 15% 35% 22% 4	4191
	11th to 20th	Day	36% 5% 14% 31% 14% 1	3885
	21st to end	Day	26% 4 12% 37% 18% 3	4311
September	1st to 10th	Day	36% 4 11% 26% 18% 7%	2400
	11th to 20th	Day	35% 4 10% 21% 26% 4	2400
	21st to end	Day	31% 3 8% 23% 29% 5%	2129
October	1st to 10th	Day	17% 2 5% 16% 43% 17%	3260
	11th to 20th	Day	20% 2 4 23% 41% 11%	3240
	21st to end	Day	31% 2 5% 30% 26% 5%	3538
November	1st to 10th	Day	33% 2 7% 27% 24% 7%	2039
	11th to 20th	Day	32% 2 7% 25% 25% 8%	1890
	21st to end	Day	42% 2 7% 22% 23% 4	1869
December	1st to 10th	Day	37% 3 8% 28% 22% 2	2690
	11th to 20th	Day	41% 3 7% 27% 19% 3	3085
	21st to end	Day	50% 2 8% 23% 14% 3	4070
January	1st to 10th	Night	42% 1 8% 31% 15% 3	7635
	11th to 20th	Night	28% 2 6% 21% 36% 7%	7680
	21st to end	Night	44% 2 8% 19% 22% 5%	8402
February	1st to 10th	Night	45% 2 8% 24% 18% 3	2730
	11th to 20th	Night	43% 2 8% 24% 18% 5%	2484
	21st to end	Night	41% 2 7% 20% 22% 9%	2076
March	1st to 10th	Night	45% 2 7% 15% 20% 12%	5133
	11th to 20th	Night	34% 3 8% 25% 18% 12%	5090
	21st to end	Night	38% 2 9% 29% 19% 2	5458
April	1st to 10th	Night	35% 3 10% 25% 21% 6%	2100
	11th to 20th	Night	34% 3 9% 24% 21% 9%	2075
	21st to end	Night	39% 5% 10% 23% 20% 3	2100
May	1st to 10th	Night	45% 4 13% 22% 14% 2	5862
	11th to 20th	Night	46% 4 13% 22% 12% 4	5437
	21st to end	Night	53% 5% 12% 17% 10% 3	5173
June	1st to 10th	Night	29% 4 13% 28% 24% 2	1680
	11th to 20th	Night	24% 4 13% 31% 25% 4	1640
	21st to end	Night	21% 4 14% 32% 20% 8%	1600
July	1st to 10th	Night	31% 6% 15% 23% 23% 2	3774
	11th to 20th	Night	19% 5% 19% 38% 16% 3	4026
	21st to end	Night	33% 5% 15% 33% 15% 1	4320
August	1st to 10th	Night	17% 4 15% 39% 22% 3	2942
	11th to 20th	Night	25% 5% 20% 32% 16% 1	3230
	21st to end	Night	22% 4 11% 35% 24% 3	3586
September	1st to 10th	Night	30% 4 11% 27% 20% 8%	2000
	11th to 20th	Night	33% 3 10% 23% 25% 6%	2000
	21st to end	Night	28% 3 8% 22% 30% 8%	2245
October	1st to 10th	Night	14% 2 6% 17% 37% 24%	3920
	11th to 20th	Night	19% 1 4 16% 38% 22%	3899
	21st to end	Night	28% 2 5% 24% 32% 9%	4252
November	1st to 10th	Night	30% 3 8% 26% 26% 8%	2476
	11th to 20th	Night	29% 2 6% 29% 25% 9%	2730
	21st to end	Night	36% 3 8% 25% 24% 4	2747
December	1st to 10th	Night	35% 2 8% 34% 18% 3	4720
	11th to 20th	Night	41% 2 7% 23% 21% 6%	5341
	21st to end	Night	50% 1 8% 24% 14% 3	7132

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	25% 20% 34% 16% 5%	330
	11th to 20th	Day	26% 24% 35% 14% 2	330
	21st to end	Day	22% 23% 38% 13% 4	363
February	1st to 10th	Day	27% 19% 36% 12% 5% 1	330
	11th to 20th	Day	31% 26% 29% 12% 3	330
	21st to end	Day	30% 24% 33% 11% 3	273
March	1st to 10th	Day	27% 19% 33% 16% 5%	330
	11th to 20th	Day	31% 19% 34% 15% 1	330
	21st to end	Day	24% 21% 39% 13% 4	415
April	1st to 10th	Day	23% 15% 32% 21% 8% 1	540
	11th to 20th	Day	20% 20% 34% 18% 7% 1	532
	21st to end	Day	20% 14% 35% 21% 9% 2	540
May	1st to 10th	Day	17% 18% 34% 22% 8% 1	543
	11th to 20th	Day	15% 11% 32% 24% 14% 4	706
	21st to end	Day	12% 8% 29% 30% 15% 5%	844
June	1st to 10th	Day	8% 6% 23% 31% 23% 9%	780
	11th to 20th	Day	6% 2 21% 37% 26% 8%	756
	21st to end	Day	4 3 21% 36% 27% 9%	730
July	1st to 10th	Day	7% 3 16% 29% 33% 13%	721
	11th to 20th	Day	6% 2 14% 35% 30% 14%	718
	21st to end	Day	8% 2 12% 31% 34% 14%	794
August	1st to 10th	Day	6% 2 11% 39% 34% 7%	710
	11th to 20th	Day	13% 2 11% 29% 30% 14%	519
	21st to end	Day	9% 2 11% 30% 31% 17%	583
September	1st to 10th	Day	9% 4 10% 30% 36% 11%	530
	11th to 20th	Day	11% 3 13% 25% 29% 18%	530
	21st to end	Day	15% 5% 20% 27% 22% 10%	425
October	1st to 10th	Day	7% 5% 23% 39% 21% 5%	330
	11th to 20th	Day	14% 14% 30% 25% 14% 2	330
	21st to end	Day	28% 11% 31% 23% 6% 1	363
November	1st to 10th	Day	15% 14% 35% 24% 11% 2	330
	11th to 20th	Day	14% 17% 37% 22% 8% 2	330
	21st to end	Day	30% 14% 29% 17% 8% 2	330
December	1st to 10th	Day	20% 21% 33% 17% 8% 1	330
	11th to 20th	Day	27% 15% 32% 20% 5% 1	330
	21st to end	Day	23% 25% 35% 15% 3	363
January	1st to 10th	Night	23% 17% 32% 24% 4	1050
	11th to 20th	Night	21% 19% 35% 21% 3	1050
	21st to end	Night	21% 15% 37% 25% 2	1155
February	1st to 10th	Night	24% 15% 32% 25% 4	1050
	11th to 20th	Night	24% 18% 36% 21% 2	848
	21st to end	Night	23% 18% 34% 23% 2	692
March	1st to 10th	Night	23% 13% 31% 29% 4	686
	11th to 20th	Night	24% 14% 33% 26% 3	630
	21st to end	Night	18% 13% 34% 28% 7%	693
April	1st to 10th	Night	14% 16% 37% 26% 7%	630
	11th to 20th	Night	16% 17% 29% 29% 9% 1	623
	21st to end	Night	17% 10% 36% 27% 10% 1	630
May	1st to 10th	Night	15% 9% 29% 37% 8%	630
	11th to 20th	Night	16% 7% 30% 29% 15% 3	621
	21st to end	Night	13% 4 22% 36% 21% 4	683
June	1st to 10th	Night	7% 3 18% 36% 32% 4	630
	11th to 20th	Night	4 1 14% 44% 34% 3	615
	21st to end	Night	4 2 15% 39% 37% 4	600
July	1st to 10th	Night	7% 2 8% 37% 37% 10%	585
	11th to 20th	Night	5% 1 8% 36% 42% 8%	582
	21st to end	Night	5% 2 9% 39% 37% 8%	657
August	1st to 10th	Night	5% 1 9% 39% 42% 5%	597
	11th to 20th	Night	6% 2 10% 40% 37% 6%	594
	21st to end	Night	7% 1 9% 33% 43% 8%	660
September	1st to 10th	Night	10% 2 9% 33% 43% 4	600
	11th to 20th	Night	12% 3 10% 31% 39% 6%	600
	21st to end	Night	9% 5% 19% 32% 33% 3	745
October	1st to 10th	Night	8% 5% 16% 36% 33% 3	800
	11th to 20th	Night	13% 8% 27% 33% 18% 1	800
	21st to end	Night	21% 8% 27% 30% 13% 1	880
November	1st to 10th	Night	16% 9% 27% 34% 13% 1	820
	11th to 20th	Night	14% 10% 31% 34% 11%	840
	21st to end	Night	18% 13% 32% 27% 10%	857
December	1st to 10th	Night	21% 11% 33% 30% 6%	1050
	11th to 20th	Night	22% 11% 31% 31% 4	1050
	21st to end	Night	24% 16% 30% 25% 5%	1155

Page generated at 2026-06-13 01:31:42. Version ac07

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