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 2025-05-11.

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	15% 6% 2 6% 4 4 5% 4 6% 7% 42%	114159
	Night	16% 6% 2 5% 4 4 4 3 5% 7% 45%	114798
Transparency	Day	40% 5% 10% 19% 19% 7%	117953
	Night	38% 5% 10% 20% 21% 7%	119143
Seeing	Day	20% 10% 23% 23% 16% 8%	15573
	Night	19% 9% 21% 29% 19% 4	25684

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	17% 5% 2 4 3 3 3 3 4 5% 51%	4056
	11th to 20th	Day	13% 5% 2 4 3 2 2 2 3 4 59%	4060
	21st to end	Day	22% 7% 2 6% 4 3 3 3 3 5% 43%	4466
February	1st to 10th	Day	18% 8% 2 5% 3 3 4 3 5% 6% 43%	1997
	11th to 20th	Day	22% 6% 2 5% 4 3 4 3 5% 4 42%	1948
	21st to end	Day	21% 6% 2 6% 4 4 4 3 4 5% 41%	1650
March	1st to 10th	Day	23% 7% 3 5% 4 4 4 2 4 5% 40%	4701
	11th to 20th	Day	12% 5% 2 5% 3 3 3 2 5% 6% 53%	4980
	21st to end	Day	19% 5% 2 5% 4 4 3 3 4 5% 45%	5465
April	1st to 10th	Day	14% 5% 2 5% 3 5% 5% 5% 6% 7% 43%	2204
	11th to 20th	Day	13% 5% 2 6% 5% 4 4 3 5% 6% 46%	2394
	21st to end	Day	14% 4 2 5% 4 4 4 4 6% 7% 47%	2600
May	1st to 10th	Day	14% 8% 2 7% 4 4 4 4 6% 8% 38%	4212
	11th to 20th	Day	19% 7% 2 7% 4 5% 5% 4 5% 7% 33%	4081
	21st to end	Day	9% 4 2 7% 5% 5% 6% 5% 7% 10% 40%	4476
June	1st to 10th	Day	13% 6% 3 8% 6% 6% 6% 5% 7% 9% 32%	2470
	11th to 20th	Day	7% 5% 2 6% 6% 6% 7% 6% 9% 11% 36%	2470
	21st to end	Day	8% 5% 2 7% 6% 6% 7% 6% 9% 9% 36%	2470
July	1st to 10th	Day	7% 6% 3 8% 6% 8% 7% 6% 9% 11% 29%	4120
	11th to 20th	Day	9% 5% 2 7% 7% 7% 7% 6% 8% 10% 30%	4120
	21st to end	Day	11% 8% 4 12% 10% 9% 8% 7% 8% 8% 17%	4466
August	1st to 10th	Day	9% 6% 3 7% 5% 7% 7% 6% 8% 11% 33%	4104
	11th to 20th	Day	8% 5% 2 7% 4 6% 6% 6% 8% 12% 36%	3954
	21st to end	Day	8% 4 2 6% 5% 5% 6% 4 6% 7% 46%	4131
September	1st to 10th	Day	11% 6% 3 6% 5% 6% 7% 5% 6% 8% 37%	2090
	11th to 20th	Day	18% 6% 2 7% 5% 5% 5% 4 7% 7% 36%	2090
	21st to end	Day	16% 6% 2 6% 4 3 3 3 5% 7% 44%	2090
October	1st to 10th	Day	15% 5% 2 3 3 3 3 3 5% 5% 53%	2090
	11th to 20th	Day	13% 5% 1 4 3 3 4 3 4 5% 55%	1935
	21st to end	Day	15% 5% 1 4 3 3 3 2 4 5% 56%	2090
November	1st to 10th	Day	14% 4 1 4 3 3 3 3 4 5% 55%	1810
	11th to 20th	Day	16% 4 1 3 3 3 3 2 4 7% 52%	1800
	21st to end	Day	16% 5% 2 4 4 3 4 3 4 5% 50%	1800
December	1st to 10th	Day	20% 5% 2 3 3 3 3 3 4 5% 49%	2930
	11th to 20th	Day	19% 7% 2 6% 4 3 4 4 4 4 41%	3373
	21st to end	Day	25% 5% 1 4 3 2 3 3 5% 7% 43%	4466
January	1st to 10th	Night	17% 5% 1 4 3 3 3 3 4 5% 53%	5889
	11th to 20th	Night	15% 7% 2 5% 3 3 2 3 4 5% 52%	5900
	21st to end	Night	20% 7% 2 4 3 3 3 2 4 5% 47%	6490
February	1st to 10th	Night	16% 6% 2 5% 4 3 4 4 5% 6% 47%	2400
	11th to 20th	Night	22% 6% 2 5% 4 4 3 2 4 5% 42%	2338
	21st to end	Night	19% 6% 2 6% 5% 4 4 4 4 6% 40%	1980
March	1st to 10th	Night	23% 7% 2 6% 4 4 4 3 5% 6% 37%	5150
	11th to 20th	Night	11% 4 1 3 3 3 4 4 6% 7% 54%	4980
	21st to end	Night	17% 6% 2 5% 4 4 4 3 5% 6% 44%	5467
April	1st to 10th	Night	15% 5% 1 4 4 3 4 4 5% 6% 49%	2200
	11th to 20th	Night	14% 5% 2 5% 4 3 3 3 5% 6% 50%	1964
	21st to end	Night	12% 6% 2 5% 3 3 4 3 6% 7% 49%	1800
May	1st to 10th	Night	14% 7% 2 7% 4 4 4 4 6% 8% 39%	2903
	11th to 20th	Night	20% 6% 2 5% 4 4 4 3 5% 7% 39%	2818
	21st to end	Night	9% 4 2 6% 4 4 5% 5% 7% 9% 45%	3079
June	1st to 10th	Night	11% 7% 2 8% 6% 5% 5% 5% 8% 8% 35%	1710
	11th to 20th	Night	7% 6% 2 4 5% 5% 5% 5% 8% 11% 43%	1710
	21st to end	Night	8% 4 2 5% 4 5% 6% 5% 7% 10% 44%	1710
July	1st to 10th	Night	11% 8% 3 9% 6% 6% 6% 5% 7% 10% 29%	2840
	11th to 20th	Night	8% 5% 2 6% 6% 7% 7% 6% 8% 12% 33%	2840
	21st to end	Night	15% 9% 4 10% 7% 6% 6% 5% 8% 10% 22%	3087
August	1st to 10th	Night	9% 7% 2 7% 5% 5% 6% 4 8% 12% 34%	2825
	11th to 20th	Night	11% 6% 3 7% 5% 4 5% 4 7% 9% 40%	2870
	21st to end	Night	8% 5% 2 5% 4 5% 4 4 6% 9% 47%	3491
September	1st to 10th	Night	11% 7% 2 6% 5% 5% 5% 6% 6% 8% 40%	2090
	11th to 20th	Night	17% 8% 3 6% 3 4 4 4 6% 7% 38%	2090
	21st to end	Night	15% 6% 2 5% 4 4 4 3 5% 6% 47%	2090
October	1st to 10th	Night	16% 4 2 4 3 3 3 2 3 5% 54%	2090
	11th to 20th	Night	13% 4 2 5% 4 2 3 2 5% 5% 54%	2243
	21st to end	Night	15% 4 1 4 3 2 2 2 5% 6% 56%	2508
November	1st to 10th	Night	16% 5% 2 4 2 2 2 2 4 6% 55%	2484
	11th to 20th	Night	17% 5% 1 3 3 3 3 3 4 6% 52%	2600
	21st to end	Night	16% 6% 2 5% 3 4 4 4 5% 6% 46%	2600
December	1st to 10th	Night	19% 5% 2 5% 3 2 3 2 3 4 51%	4250
	11th to 20th	Night	20% 6% 2 6% 3 3 4 3 4 5% 43%	4822
	21st to end	Night	24% 6% 1 4 3 3 3 3 4 6% 42%	6490

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	37% 3 4 20% 28% 9%	4057
	11th to 20th	Day	32% 1 4 15% 34% 13%	4060
	21st to end	Day	45% 3 3 17% 22% 10%	4466
February	1st to 10th	Day	42% 3 7% 20% 21% 6%	1997
	11th to 20th	Day	45% 3 6% 19% 20% 7%	1958
	21st to end	Day	46% 3 7% 14% 21% 9%	1650
March	1st to 10th	Day	48% 2 5% 14% 20% 10%	4701
	11th to 20th	Day	33% 3 6% 14% 24% 21%	4980
	21st to end	Day	43% 3 5% 23% 20% 6%	5465
April	1st to 10th	Day	39% 5% 10% 20% 20% 6%	2204
	11th to 20th	Day	38% 4 8% 19% 24% 8%	2394
	21st to end	Day	35% 4 11% 29% 18% 3	2600
May	1st to 10th	Day	45% 3 14% 18% 17% 3	4250
	11th to 20th	Day	50% 5% 10% 21% 13% 1	4085
	21st to end	Day	38% 5% 14% 22% 19% 1	4489
June	1st to 10th	Day	46% 6% 17% 21% 8% 2	2470
	11th to 20th	Day	36% 9% 20% 21% 13% 2	2470
	21st to end	Day	38% 9% 18% 19% 13% 3	2470
July	1st to 10th	Day	43% 12% 20% 19% 5% 1	4055
	11th to 20th	Day	43% 12% 22% 17% 4 2	4051
	21st to end	Day	60% 10% 14% 11% 4	4324
August	1st to 10th	Day	39% 8% 16% 30% 6%	4091
	11th to 20th	Day	35% 10% 22% 17% 13% 2	3993
	21st to end	Day	34% 7% 13% 25% 19% 2	4131
September	1st to 10th	Day	42% 7% 13% 18% 17% 3	2090
	11th to 20th	Day	46% 5% 12% 17% 19% 2	2090
	21st to end	Day	40% 5% 10% 19% 20% 7%	2090
October	1st to 10th	Day	26% 3 7% 17% 39% 9%	3480
	11th to 20th	Day	22% 2 5% 14% 29% 28%	3188
	21st to end	Day	30% 3 5% 21% 27% 15%	3428
November	1st to 10th	Day	33% 3 7% 16% 30% 11%	1810
	11th to 20th	Day	34% 2 5% 20% 28% 10%	1800
	21st to end	Day	36% 3 6% 18% 29% 7%	1800
December	1st to 10th	Day	39% 2 4 17% 27% 11%	2930
	11th to 20th	Day	45% 4 5% 16% 21% 9%	3370
	21st to end	Day	42% 2 7% 26% 20% 3	4466
January	1st to 10th	Night	36% 2 5% 17% 30% 9%	5889
	11th to 20th	Night	35% 3 5% 18% 28% 12%	5900
	21st to end	Night	41% 2 4 16% 27% 10%	6490
February	1st to 10th	Night	38% 3 8% 22% 22% 6%	2400
	11th to 20th	Night	46% 3 5% 17% 22% 7%	2339
	21st to end	Night	45% 4 7% 16% 21% 7%	1980
March	1st to 10th	Night	48% 3 6% 14% 22% 6%	5150
	11th to 20th	Night	29% 4 7% 17% 26% 17%	4980
	21st to end	Night	42% 2 6% 23% 19% 8%	5467
April	1st to 10th	Night	35% 4 10% 20% 24% 6%	2200
	11th to 20th	Night	36% 3 6% 23% 22% 10%	1964
	21st to end	Night	35% 4 11% 28% 19% 3	1800
May	1st to 10th	Night	43% 4 15% 23% 14% 1	2930
	11th to 20th	Night	45% 4 14% 23% 13% 1	2819
	21st to end	Night	34% 5% 15% 28% 16% 2	3087
June	1st to 10th	Night	43% 9% 17% 20% 10% 2	1710
	11th to 20th	Night	33% 7% 22% 24% 13% 1	1710
	21st to end	Night	33% 10% 19% 21% 14% 3	1710
July	1st to 10th	Night	48% 10% 19% 18% 5% 1	2795
	11th to 20th	Night	39% 13% 25% 18% 4 1	2786
	21st to end	Night	55% 11% 16% 13% 4 1	2988
August	1st to 10th	Night	39% 10% 22% 23% 5%	2814
	11th to 20th	Night	38% 11% 18% 18% 14% 1	2897
	21st to end	Night	33% 7% 15% 26% 18% 2	3491
September	1st to 10th	Night	40% 8% 13% 19% 16% 4	2090
	11th to 20th	Night	43% 6% 13% 19% 18% 1	2090
	21st to end	Night	39% 5% 10% 20% 19% 6%	2090
October	1st to 10th	Night	27% 4 11% 15% 36% 8%	3480
	11th to 20th	Night	20% 2 5% 19% 31% 23%	3729
	21st to end	Night	28% 3 4 21% 27% 16%	4120
November	1st to 10th	Night	33% 3 7% 19% 26% 11%	2484
	11th to 20th	Night	35% 3 5% 18% 28% 12%	2600
	21st to end	Night	39% 4 5% 21% 24% 7%	2600
December	1st to 10th	Night	38% 3 5% 17% 28% 9%	4250
	11th to 20th	Night	43% 4 7% 17% 22% 7%	4824
	21st to end	Night	45% 2 6% 25% 19% 3	6490

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% 25% 33% 10% 2	300
	11th to 20th	Day	32% 24% 25% 13% 5%	300
	21st to end	Day	31% 24% 31% 11% 2 1	330
February	1st to 10th	Day	26% 20% 36% 15% 3	300
	11th to 20th	Day	45% 20% 28% 7%	300
	21st to end	Day	37% 20% 33% 10% 1	249
March	1st to 10th	Day	29% 17% 28% 19% 7%	391
	11th to 20th	Day	26% 18% 32% 19% 5% 1	500
	21st to end	Day	29% 18% 30% 17% 6% 1	550
April	1st to 10th	Day	24% 15% 28% 22% 10% 1	500
	11th to 20th	Day	17% 17% 32% 22% 9% 3	492
	21st to end	Day	20% 12% 26% 24% 15% 4	500
May	1st to 10th	Day	18% 14% 29% 21% 11% 6%	503
	11th to 20th	Day	19% 8% 20% 29% 15% 10%	487
	21st to end	Day	16% 8% 21% 24% 19% 12%	529
June	1st to 10th	Day	18% 6% 17% 29% 20% 11%	490
	11th to 20th	Day	11% 4 17% 29% 23% 18%	490
	21st to end	Day	10% 4 20% 30% 22% 13%	490
July	1st to 10th	Day	12% 3 12% 22% 29% 22%	485
	11th to 20th	Day	11% 2 11% 24% 30% 23%	484
	21st to end	Day	7% 1 11% 27% 32% 22%	532
August	1st to 10th	Day	16% 3 15% 24% 23% 19%	486
	11th to 20th	Day	15% 2 10% 27% 28% 18%	479
	21st to end	Day	16% 2 10% 25% 30% 17%	539
September	1st to 10th	Day	12% 4 17% 25% 30% 12%	490
	11th to 20th	Day	21% 4 12% 22% 30% 11%	490
	21st to end	Day	21% 5% 16% 25% 25% 8%	490
October	1st to 10th	Day	20% 5% 20% 30% 18% 7%	490
	11th to 20th	Day	17% 9% 22% 33% 16% 4	490
	21st to end	Day	19% 9% 25% 29% 16% 2	539
November	1st to 10th	Day	21% 9% 30% 24% 13% 3	348
	11th to 20th	Day	23% 19% 33% 20% 5%	300
	21st to end	Day	19% 16% 36% 20% 8% 1	300
December	1st to 10th	Day	31% 20% 30% 15% 3	300
	11th to 20th	Day	25% 18% 36% 16% 4 1	300
	21st to end	Day	36% 14% 28% 15% 5% 1	330
January	1st to 10th	Night	26% 17% 30% 21% 6%	800
	11th to 20th	Night	23% 17% 28% 26% 6%	800
	21st to end	Night	23% 17% 33% 25% 3	880
February	1st to 10th	Night	20% 14% 30% 31% 5%	800
	11th to 20th	Night	27% 19% 29% 22% 3	783
	21st to end	Night	25% 15% 31% 26% 3	660
March	1st to 10th	Night	22% 15% 30% 29% 4	800
	11th to 20th	Night	20% 15% 30% 28% 7% 1	800
	21st to end	Night	22% 15% 26% 29% 8%	880
April	1st to 10th	Night	19% 15% 29% 27% 10%	800
	11th to 20th	Night	16% 14% 23% 32% 14% 1	604
	21st to end	Night	15% 6% 23% 34% 20% 2	600
May	1st to 10th	Night	14% 10% 21% 33% 21% 1	600
	11th to 20th	Night	20% 4 17% 30% 25% 4	563
	21st to end	Night	15% 2 13% 30% 31% 7%	617
June	1st to 10th	Night	12% 3 13% 32% 34% 5%	570
	11th to 20th	Night	10% 2 11% 31% 31% 15%	570
	21st to end	Night	9% 2 10% 36% 35% 8%	570
July	1st to 10th	Night	13% 3 8% 22% 44% 10%	555
	11th to 20th	Night	12% 2 6% 24% 43% 14%	552
	21st to end	Night	9% 2 7% 25% 43% 13%	624
August	1st to 10th	Night	16% 1 7% 24% 39% 13%	567
	11th to 20th	Night	17% 2 7% 25% 38% 10%	564
	21st to end	Night	14% 3 6% 27% 41% 10%	629
September	1st to 10th	Night	13% 2 11% 31% 35% 9%	760
	11th to 20th	Night	21% 3 12% 27% 32% 5%	760
	21st to end	Night	18% 4 12% 34% 29% 3	760
October	1st to 10th	Night	17% 5% 19% 30% 24% 6%	760
	11th to 20th	Night	15% 9% 21% 33% 19% 3	760
	21st to end	Night	17% 9% 19% 34% 18% 3	836
November	1st to 10th	Night	18% 8% 21% 32% 18% 3	780
	11th to 20th	Night	20% 11% 25% 32% 12% 1	800
	21st to end	Night	20% 12% 25% 30% 12% 1	800
December	1st to 10th	Night	26% 15% 24% 28% 7% 1	800
	11th to 20th	Night	21% 13% 26% 30% 8% 1	800
	21st to end	Night	29% 12% 25% 28% 5%	880

Page generated at 2025-05-08 09:33:54. Version ac07

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