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 2026-09-14.

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	14% 6% 2 6% 5% 5% 5% 4 6% 8% 40%	148513
	Night	15% 6% 2 6% 4 4 4 4 5% 7% 43%	142559
Transparency	Day	40% 6% 12% 19% 17% 6%	152263
	Night	39% 5% 11% 19% 19% 6%	146881
Seeing	Day	20% 11% 23% 23% 16% 8%	17414
	Night	19% 9% 21% 29% 19% 4	27392

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	19% 6% 2 5% 3 3 3 3 4 5% 46%	5258
	11th to 20th	Day	11% 5% 2 4 3 2 2 2 3 3 63%	5280
	21st to end	Day	23% 7% 3 6% 4 3 3 3 4 5% 39%	5780
February	1st to 10th	Day	17% 8% 2 5% 3 3 4 3 5% 6% 43%	2097
	11th to 20th	Day	22% 6% 2 5% 4 4 4 3 5% 5% 42%	2048
	21st to end	Day	21% 6% 2 5% 4 4 4 3 5% 5% 41%	1730
March	1st to 10th	Day	22% 7% 3 5% 4 4 4 2 4 5% 40%	4806
	11th to 20th	Day	12% 5% 2 5% 3 3 3 2 5% 6% 53%	5090
	21st to end	Day	19% 5% 2 5% 4 4 3 3 4 5% 45%	5586
April	1st to 10th	Day	14% 5% 2 5% 3 5% 5% 5% 6% 7% 42%	2314
	11th to 20th	Day	13% 5% 2 6% 5% 4 4 3 5% 6% 47%	2515
	21st to end	Day	14% 4 2 5% 4 4 4 4 6% 7% 47%	2730
May	1st to 10th	Day	15% 8% 3 7% 4 4 4 4 6% 8% 35%	7616
	11th to 20th	Day	16% 7% 3 7% 5% 5% 6% 5% 6% 8% 33%	7626
	21st to end	Day	19% 7% 3 8% 5% 5% 5% 4 6% 7% 30%	8391
June	1st to 10th	Day	12% 6% 3 7% 6% 6% 6% 5% 7% 9% 32%	2730
	11th to 20th	Day	7% 5% 2 6% 6% 6% 7% 6% 9% 11% 35%	2730
	21st to end	Day	7% 4 1 6% 6% 6% 7% 6% 9% 10% 37%	2730
July	1st to 10th	Day	5% 4 2 7% 6% 7% 7% 6% 9% 12% 34%	7680
	11th to 20th	Day	7% 5% 2 7% 7% 8% 8% 7% 10% 12% 28%	7680
	21st to end	Day	9% 6% 3 9% 7% 7% 8% 6% 8% 10% 25%	8340
August	1st to 10th	Day	10% 7% 3 8% 6% 7% 8% 6% 8% 11% 26%	6014
	11th to 20th	Day	6% 3 2 5% 4 5% 5% 5% 8% 13% 44%	5816
	21st to end	Day	6% 4 2 6% 5% 5% 6% 4 7% 8% 46%	6016
September	1st to 10th	Day	10% 6% 3 6% 5% 6% 7% 5% 7% 8% 37%	2310
	11th to 20th	Day	17% 6% 2 7% 5% 5% 5% 4 7% 7% 36%	2233
	21st to end	Day	16% 6% 2 6% 4 3 3 3 5% 8% 43%	2200
October	1st to 10th	Day	15% 6% 2 4 3 3 3 3 5% 6% 52%	2200
	11th to 20th	Day	13% 5% 1 4 3 2 4 3 4 5% 56%	2037
	21st to end	Day	15% 5% 1 4 3 3 3 2 4 5% 56%	2200
November	1st to 10th	Day	14% 4 2 4 3 3 3 3 4 5% 56%	1902
	11th to 20th	Day	16% 4 1 3 3 3 3 2 4 7% 54%	1890
	21st to end	Day	16% 5% 1 4 3 3 4 3 4 5% 50%	1890
December	1st to 10th	Day	20% 5% 2 3 3 3 4 3 4 5% 48%	3020
	11th to 20th	Day	18% 7% 2 6% 4 3 4 4 4 4 42%	3463
	21st to end	Day	24% 5% 1 4 3 2 3 2 5% 7% 44%	4565
January	1st to 10th	Night	18% 5% 1 5% 3 3 3 3 4 5% 49%	7635
	11th to 20th	Night	13% 7% 2 4 3 3 3 3 4 5% 54%	7680
	21st to end	Night	21% 8% 2 5% 3 3 3 2 4 4 45%	8401
February	1st to 10th	Night	16% 6% 2 5% 3 3 3 3 5% 6% 47%	2520
	11th to 20th	Night	22% 6% 2 5% 4 4 3 2 4 5% 42%	2458
	21st to end	Night	20% 7% 2 6% 5% 4 4 4 4 6% 39%	2076
March	1st to 10th	Night	23% 7% 2 6% 4 4 4 3 5% 6% 37%	5265
	11th to 20th	Night	11% 4 1 4 3 3 4 4 6% 7% 54%	5090
	21st to end	Night	17% 6% 2 5% 4 4 4 3 4 6% 45%	5588
April	1st to 10th	Night	15% 5% 1 4 4 4 4 4 5% 6% 48%	2310
	11th to 20th	Night	13% 5% 1 5% 4 3 3 3 5% 7% 51%	2064
	21st to end	Night	12% 6% 2 5% 3 3 4 3 6% 7% 49%	1890
May	1st to 10th	Night	15% 7% 2 7% 5% 5% 5% 4 6% 8% 35%	5237
	11th to 20th	Night	19% 7% 2 6% 4 5% 4 4 5% 8% 36%	5234
	21st to end	Night	20% 7% 2 7% 4 4 5% 4 6% 7% 32%	5761
June	1st to 10th	Night	10% 7% 2 8% 6% 5% 5% 5% 8% 8% 36%	1890
	11th to 20th	Night	8% 6% 2 4 5% 5% 5% 5% 8% 11% 42%	1890
	21st to end	Night	8% 4 2 5% 4 4 5% 5% 8% 10% 44%	1890
July	1st to 10th	Night	8% 6% 3 8% 5% 6% 6% 5% 8% 11% 33%	5278
	11th to 20th	Night	8% 6% 2 7% 6% 6% 7% 6% 9% 12% 31%	5277
	21st to end	Night	14% 8% 3 8% 5% 5% 5% 4 7% 9% 30%	5736
August	1st to 10th	Night	13% 8% 3 8% 5% 5% 6% 5% 8% 11% 28%	4135
	11th to 20th	Night	9% 4 2 6% 4 3 5% 4 8% 12% 42%	4211
	21st to end	Night	8% 5% 2 6% 5% 5% 5% 4 7% 9% 45%	5061
September	1st to 10th	Night	11% 6% 3 6% 5% 5% 5% 6% 6% 8% 40%	2310
	11th to 20th	Night	16% 7% 3 6% 3 5% 4 4 6% 8% 38%	2234
	21st to end	Night	15% 7% 2 5% 4 4 4 3 5% 6% 46%	2200
October	1st to 10th	Night	16% 4 2 4 4 3 3 2 4 6% 53%	2200
	11th to 20th	Night	13% 4 2 5% 4 2 3 2 4 5% 55%	2361
	21st to end	Night	15% 4 1 4 3 2 2 2 5% 6% 55%	2640
November	1st to 10th	Night	16% 5% 2 4 2 2 2 2 4 6% 55%	2612
	11th to 20th	Night	16% 5% 1 3 3 3 3 3 4 6% 53%	2730
	21st to end	Night	16% 6% 2 5% 3 4 4 3 5% 6% 46%	2730
December	1st to 10th	Night	19% 5% 2 5% 3 2 3 2 4 5% 50%	4380
	11th to 20th	Night	20% 6% 2 6% 3 3 3 3 4 5% 44%	4952
	21st to end	Night	24% 6% 1 4 3 3 3 3 4 6% 42%	6633

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	41% 4 4 22% 22% 7%	5259
	11th to 20th	Day	29% 2 4 13% 35% 18%	5280
	21st to end	Day	49% 3 3 15% 18% 12%	5780
February	1st to 10th	Day	42% 4 6% 21% 21% 6%	2097
	11th to 20th	Day	45% 3 6% 19% 20% 7%	2058
	21st to end	Day	45% 3 7% 15% 20% 9%	1730
March	1st to 10th	Day	48% 3 6% 14% 20% 10%	4806
	11th to 20th	Day	33% 3 6% 14% 24% 20%	5090
	21st to end	Day	43% 3 5% 23% 20% 6%	5586
April	1st to 10th	Day	39% 5% 10% 20% 20% 5%	2314
	11th to 20th	Day	37% 4 8% 19% 25% 7%	2515
	21st to end	Day	36% 4 11% 29% 18% 3	2730
May	1st to 10th	Day	46% 5% 12% 21% 14% 2	7651
	11th to 20th	Day	47% 7% 14% 20% 10% 2	7630
	21st to end	Day	53% 6% 10% 16% 13% 2	8405
June	1st to 10th	Day	45% 7% 17% 21% 8% 2	2730
	11th to 20th	Day	36% 9% 20% 21% 12% 1	2730
	21st to end	Day	36% 10% 18% 20% 13% 3	2730
July	1st to 10th	Day	36% 13% 23% 23% 5%	7615
	11th to 20th	Day	40% 17% 25% 15% 2 1	7611
	21st to end	Day	48% 11% 16% 18% 7% 1	8156
August	1st to 10th	Day	44% 12% 17% 22% 4	6001
	11th to 20th	Day	27% 10% 26% 24% 11% 2	5855
	21st to end	Day	32% 8% 15% 26% 18% 2	6016
September	1st to 10th	Day	40% 7% 14% 19% 17% 3	2310
	11th to 20th	Day	44% 5% 13% 18% 18% 2	2233
	21st to end	Day	39% 5% 11% 19% 19% 6%	2200
October	1st to 10th	Day	26% 3 7% 17% 38% 9%	3590
	11th to 20th	Day	22% 2 5% 14% 29% 28%	3290
	21st to end	Day	30% 3 5% 21% 27% 14%	3538
November	1st to 10th	Day	32% 3 7% 16% 30% 12%	1902
	11th to 20th	Day	33% 2 6% 22% 28% 10%	1890
	21st to end	Day	36% 3 7% 18% 29% 7%	1890
December	1st to 10th	Day	39% 3 4 17% 26% 10%	3020
	11th to 20th	Day	45% 4 6% 16% 21% 9%	3460
	21st to end	Day	41% 2 7% 26% 20% 3	4565
January	1st to 10th	Night	38% 3 10% 19% 24% 7%	7636
	11th to 20th	Night	34% 3 4 17% 29% 13%	7680
	21st to end	Night	44% 2 4 15% 24% 11%	8401
February	1st to 10th	Night	38% 3 8% 22% 23% 6%	2520
	11th to 20th	Night	46% 3 5% 18% 22% 6%	2459
	21st to end	Night	46% 4 7% 16% 21% 7%	2076
March	1st to 10th	Night	48% 3 6% 14% 22% 6%	5265
	11th to 20th	Night	29% 4 7% 17% 26% 17%	5090
	21st to end	Night	42% 2 7% 23% 18% 8%	5588
April	1st to 10th	Night	36% 5% 10% 19% 24% 6%	2310
	11th to 20th	Night	34% 3 6% 25% 23% 9%	2064
	21st to end	Night	35% 4 11% 28% 20% 3	1890
May	1st to 10th	Night	46% 5% 13% 22% 11% 2	5264
	11th to 20th	Night	47% 5% 15% 21% 11% 1	5235
	21st to end	Night	50% 6% 12% 20% 11% 1	5771
June	1st to 10th	Night	43% 9% 16% 20% 11% 2	1890
	11th to 20th	Night	34% 8% 21% 23% 13% 1	1890
	21st to end	Night	32% 10% 20% 21% 14% 3	1890
July	1st to 10th	Night	40% 12% 24% 20% 4	5235
	11th to 20th	Night	41% 15% 27% 15% 2 1	5226
	21st to end	Night	48% 10% 18% 17% 5% 2	5606
August	1st to 10th	Night	46% 12% 19% 19% 4	4124
	11th to 20th	Night	30% 11% 25% 21% 12% 1	4238
	21st to end	Night	33% 8% 16% 26% 16% 1	5061
September	1st to 10th	Night	39% 8% 14% 20% 16% 4	2310
	11th to 20th	Night	43% 7% 13% 19% 17% 1	2234
	21st to end	Night	40% 5% 11% 20% 19% 6%	2200
October	1st to 10th	Night	27% 4 11% 15% 36% 8%	3590
	11th to 20th	Night	19% 2 5% 19% 31% 23%	3847
	21st to end	Night	29% 3 4 21% 27% 16%	4252
November	1st to 10th	Night	33% 3 7% 19% 27% 11%	2612
	11th to 20th	Night	34% 3 5% 19% 28% 12%	2730
	21st to end	Night	39% 4 5% 22% 24% 7%	2730
December	1st to 10th	Night	38% 3 5% 17% 28% 9%	4380
	11th to 20th	Night	42% 4 8% 17% 22% 7%	4954
	21st to end	Night	44% 2 6% 25% 19% 3	6633

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	30% 24% 34% 11% 2	330
	11th to 20th	Day	33% 25% 25% 12% 5%	330
	21st to end	Day	31% 25% 31% 10% 2 1	363
February	1st to 10th	Day	25% 22% 35% 15% 2	330
	11th to 20th	Day	43% 21% 27% 8%	330
	21st to end	Day	36% 20% 33% 10% 1	273
March	1st to 10th	Day	27% 17% 29% 20% 6%	426
	11th to 20th	Day	27% 17% 32% 19% 5% 1	540
	21st to end	Day	27% 17% 31% 17% 6% 1	594
April	1st to 10th	Day	23% 14% 28% 23% 11% 1	540
	11th to 20th	Day	17% 17% 31% 23% 10% 3	532
	21st to end	Day	20% 12% 26% 24% 14% 4	540
May	1st to 10th	Day	17% 16% 29% 21% 11% 6%	543
	11th to 20th	Day	18% 10% 21% 28% 15% 9%	567
	21st to end	Day	20% 9% 21% 23% 18% 11%	617
June	1st to 10th	Day	17% 6% 18% 29% 20% 10%	570
	11th to 20th	Day	10% 4 20% 28% 22% 16%	570
	21st to end	Day	8% 4 20% 31% 22% 14%	570
July	1st to 10th	Day	10% 3 12% 24% 30% 21%	565
	11th to 20th	Day	10% 3 10% 24% 31% 22%	564
	21st to end	Day	7% 2 13% 27% 31% 20%	620
August	1st to 10th	Day	17% 3 15% 26% 21% 17%	566
	11th to 20th	Day	13% 2 10% 28% 28% 18%	559
	21st to end	Day	15% 3 12% 26% 29% 15%	627
September	1st to 10th	Day	11% 4 16% 27% 29% 13%	570
	11th to 20th	Day	19% 4 12% 23% 30% 11%	542
	21st to end	Day	20% 5% 18% 26% 25% 8%	530
October	1st to 10th	Day	19% 5% 21% 31% 17% 7%	530
	11th to 20th	Day	16% 8% 22% 34% 17% 4	530
	21st to end	Day	20% 10% 26% 27% 15% 2	583
November	1st to 10th	Day	21% 9% 31% 24% 12% 3	380
	11th to 20th	Day	22% 18% 35% 21% 5%	330
	21st to end	Day	21% 18% 35% 19% 7% 1	330
December	1st to 10th	Day	32% 21% 30% 14% 3	330
	11th to 20th	Day	25% 18% 35% 16% 5% 1	330
	21st to end	Day	35% 14% 30% 16% 5% 1	363
January	1st to 10th	Night	26% 16% 30% 22% 6%	840
	11th to 20th	Night	23% 18% 28% 26% 6%	840
	21st to end	Night	24% 17% 33% 24% 2	924
February	1st to 10th	Night	20% 15% 30% 31% 5%	840
	11th to 20th	Night	26% 18% 31% 22% 3	823
	21st to end	Night	26% 15% 32% 25% 3	692
March	1st to 10th	Night	22% 15% 29% 30% 4	840
	11th to 20th	Night	20% 15% 30% 28% 6% 1	840
	21st to end	Night	21% 14% 27% 29% 8%	924
April	1st to 10th	Night	19% 14% 28% 28% 10%	840
	11th to 20th	Night	16% 13% 23% 33% 14% 1	635
	21st to end	Night	15% 7% 22% 34% 20% 2	630
May	1st to 10th	Night	14% 9% 23% 33% 20% 1	630
	11th to 20th	Night	20% 5% 17% 31% 24% 4	621
	21st to end	Night	17% 4 14% 30% 29% 7%	683
June	1st to 10th	Night	12% 3 13% 33% 34% 5%	630
	11th to 20th	Night	11% 2 11% 31% 31% 13%	630
	21st to end	Night	8% 2 10% 35% 37% 8%	630
July	1st to 10th	Night	12% 3 7% 23% 46% 9%	615
	11th to 20th	Night	12% 2 6% 23% 44% 13%	612
	21st to end	Night	10% 2 8% 26% 42% 12%	690
August	1st to 10th	Night	18% 2 7% 23% 38% 12%	627
	11th to 20th	Night	17% 3 7% 24% 39% 10%	624
	21st to end	Night	14% 3 7% 28% 39% 9%	695
September	1st to 10th	Night	12% 3 10% 32% 34% 8%	840
	11th to 20th	Night	20% 3 12% 28% 33% 5%	813
	21st to end	Night	18% 4 12% 35% 28% 3	800
October	1st to 10th	Night	17% 5% 18% 31% 23% 6%	800
	11th to 20th	Night	15% 9% 21% 35% 19% 3	800
	21st to end	Night	17% 9% 20% 34% 17% 3	880
November	1st to 10th	Night	18% 8% 22% 33% 17% 3	820
	11th to 20th	Night	19% 11% 25% 33% 12% 1	840
	21st to end	Night	20% 13% 25% 29% 11% 1	840
December	1st to 10th	Night	26% 14% 25% 27% 7% 1	840
	11th to 20th	Night	21% 13% 27% 30% 8% 1	840
	21st to end	Night	29% 12% 25% 29% 5%	924

Page generated at 2026-09-11 04:11:57. Version ac07

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