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 2025-02-21.

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 3 5% 7% 46%	108513
	Night	13% 6% 2 5% 4 3 3 3 5% 6% 50%	110251
Transparency	Day	37% 3 10% 26% 20% 4	112158
	Night	35% 3 9% 26% 22% 6%	114747
Seeing	Day	15% 10% 25% 26% 18% 6%	15747
	Night	16% 10% 26% 30% 16% 2	25704

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	14% 8% 2 5% 4 3 3 3 4 4 49%	4077
	11th to 20th	Day	10% 7% 2 5% 3 3 3 3 4 5% 56%	4080
	21st to end	Day	20% 6% 2 3 3 3 3 2 4 5% 50%	4488
February	1st to 10th	Day	18% 7% 3 7% 4 3 4 3 3 5% 43%	1800
	11th to 20th	Day	16% 8% 2 7% 5% 4 4 3 5% 5% 42%	1923
	21st to end	Day	17% 9% 3 7% 6% 4 3 3 6% 6% 37%	1570
March	1st to 10th	Day	22% 9% 2 5% 4 3 4 4 4 5% 38%	3391
	11th to 20th	Day	14% 6% 2 6% 4 3 4 3 4 5% 49%	3480
	21st to end	Day	15% 8% 2 8% 4 3 4 3 4 5% 43%	3899
April	1st to 10th	Day	12% 6% 3 6% 4 3 4 3 6% 7% 46%	2280
	11th to 20th	Day	14% 6% 2 6% 4 4 4 3 6% 7% 42%	2254
	21st to end	Day	17% 7% 2 7% 4 4 4 3 6% 5% 40%	2280
May	1st to 10th	Day	13% 8% 3 7% 6% 5% 5% 4 6% 7% 37%	3765
	11th to 20th	Day	13% 6% 2 6% 5% 5% 5% 4 7% 9% 39%	3980
	21st to end	Day	12% 7% 2 7% 6% 5% 6% 5% 6% 8% 36%	4811
June	1st to 10th	Day	7% 6% 2 6% 5% 5% 6% 5% 8% 9% 42%	2660
	11th to 20th	Day	5% 3 2 4 5% 4 6% 5% 7% 11% 48%	2660
	21st to end	Day	4 4 2 4 5% 5% 5% 5% 7% 11% 50%	2660
July	1st to 10th	Day	9% 5% 2 5% 4 5% 5% 4 7% 9% 44%	4292
	11th to 20th	Day	6% 3 1 4 4 4 4 4 7% 9% 56%	4120
	21st to end	Day	9% 8% 3 9% 6% 5% 6% 4 7% 8% 35%	4465
August	1st to 10th	Day	4 2 1 4 3 3 4 3 5% 9% 61%	4076
	11th to 20th	Day	10% 6% 2 6% 4 4 5% 4 6% 9% 45%	3729
	21st to end	Day	6% 4 1 4 4 4 4 4 6% 9% 55%	4180
September	1st to 10th	Day	10% 5% 2 5% 4 4 5% 5% 6% 7% 48%	2280
	11th to 20th	Day	14% 5% 2 6% 3 5% 4 3 5% 8% 46%	2280
	21st to end	Day	10% 4 2 5% 4 4 4 3 4 7% 55%	2023
October	1st to 10th	Day	7% 4 2 4 3 4 3 3 5% 6% 58%	1900
	11th to 20th	Day	14% 5% 2 3 3 3 3 2 4 5% 58%	1900
	21st to end	Day	18% 5% 2 4 3 3 3 3 5% 5% 50%	2090
November	1st to 10th	Day	13% 6% 2 5% 3 3 2 2 4 6% 55%	1940
	11th to 20th	Day	10% 5% 2 5% 4 3 3 3 5% 7% 53%	1800
	21st to end	Day	19% 7% 2 6% 3 3 3 2 4 5% 47%	1780
December	1st to 10th	Day	13% 6% 2 7% 4 3 3 3 3 4 52%	2610
	11th to 20th	Day	16% 8% 2 7% 3 4 3 3 4 6% 46%	3008
	21st to end	Day	18% 9% 4 8% 4 4 4 4 6% 5% 35%	3982
January	1st to 10th	Night	16% 7% 2 6% 3 3 3 3 3 4 48%	5888
	11th to 20th	Night	12% 5% 2 5% 3 3 3 2 4 4 58%	5900
	21st to end	Night	20% 8% 3 5% 3 2 3 2 3 5% 47%	6490
February	1st to 10th	Night	19% 8% 3 6% 4 3 3 3 4 5% 42%	2600
	11th to 20th	Night	17% 7% 2 6% 4 4 3 2 4 5% 45%	2362
	21st to end	Night	17% 6% 2 5% 4 3 3 3 4 5% 46%	1885
March	1st to 10th	Night	19% 8% 3 7% 4 3 3 2 4 5% 42%	3492
	11th to 20th	Night	15% 6% 2 5% 3 3 3 2 4 5% 52%	3480
	21st to end	Night	12% 6% 2 6% 5% 4 5% 4 6% 7% 45%	3732
April	1st to 10th	Night	10% 6% 2 5% 4 4 4 4 3 7% 50%	1900
	11th to 20th	Night	14% 5% 2 4 4 3 3 3 5% 7% 51%	1875
	21st to end	Night	14% 6% 2 6% 5% 4 5% 3 5% 8% 44%	1900
May	1st to 10th	Night	17% 6% 2 5% 3 4 4 3 6% 8% 41%	3130
	11th to 20th	Night	14% 5% 2 6% 3 3 4 3 6% 8% 45%	2918
	21st to end	Night	12% 6% 3 6% 6% 4 4 4 6% 9% 41%	2753
June	1st to 10th	Night	5% 4 2 5% 3 3 5% 4 7% 10% 51%	1520
	11th to 20th	Night	2 3 1 3 5% 3 4 3 6% 9% 61%	1520
	21st to end	Night	3 3 1 3 4 3 4 4 5% 11% 58%	1520
July	1st to 10th	Night	7% 3 1 5% 3 4 4 5% 7% 11% 50%	2672
	11th to 20th	Night	5% 2 1 3 3 3 3 3 5% 10% 60%	2850
	21st to end	Night	8% 8% 3 8% 5% 5% 5% 4 6% 7% 40%	3098
August	1st to 10th	Night	2 2 1 4 2 3 4 3 6% 9% 65%	2861
	11th to 20th	Night	4 3 1 6% 4 4 4 4 7% 10% 53%	3100
	21st to end	Night	3 2 2 4 3 3 4 3 6% 9% 59%	3476
September	1st to 10th	Night	8% 5% 1 4 4 4 4 4 4 7% 55%	1900
	11th to 20th	Night	10% 6% 2 5% 3 4 3 3 4 7% 52%	1900
	21st to end	Night	7% 5% 1 5% 3 3 4 3 4 6% 59%	2133
October	1st to 10th	Night	7% 3 1 3 3 3 3 3 5% 7% 62%	2280
	11th to 20th	Night	12% 4 1 4 3 3 3 2 4 4 61%	2280
	21st to end	Night	16% 4 2 5% 3 2 3 2 3 4 54%	2508
November	1st to 10th	Night	13% 6% 2 4 3 3 3 3 4 5% 57%	2355
	11th to 20th	Night	11% 4 1 4 2 4 3 3 4 6% 57%	2600
	21st to end	Night	14% 5% 2 4 3 3 4 3 5% 7% 49%	2616
December	1st to 10th	Night	14% 6% 2 5% 3 3 3 2 4 5% 52%	4580
	11th to 20th	Night	15% 7% 3 7% 3 3 3 3 4 5% 47%	5199
	21st to end	Night	21% 8% 2 7% 4 4 4 3 4 5% 38%	6978

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% 1 8% 29% 18% 3	4078
	11th to 20th	Day	33% 2 7% 28% 26% 5%	4080
	21st to end	Day	39% 2 7% 19% 26% 8%	4488
February	1st to 10th	Day	47% 3 9% 24% 16% 3	1800
	11th to 20th	Day	45% 4 9% 19% 18% 5%	1933
	21st to end	Day	48% 2 9% 19% 15% 8%	1570
March	1st to 10th	Day	51% 2 6% 17% 15% 9%	3391
	11th to 20th	Day	40% 2 7% 27% 19% 5%	3480
	21st to end	Day	45% 2 10% 23% 19% 1	3899
April	1st to 10th	Day	38% 4 8% 27% 21% 3	2280
	11th to 20th	Day	41% 3 9% 24% 16% 7%	2254
	21st to end	Day	45% 3 10% 23% 18% 2	2280
May	1st to 10th	Day	47% 3 12% 21% 16% 2	3800
	11th to 20th	Day	41% 4 16% 26% 12% 1	3984
	21st to end	Day	46% 4 11% 25% 14% 2	4824
June	1st to 10th	Day	36% 5% 14% 26% 18% 1	2660
	11th to 20th	Day	27% 6% 15% 32% 17% 4	2660
	21st to end	Day	27% 6% 15% 29% 20% 4	2660
July	1st to 10th	Day	35% 5% 15% 29% 14% 2	4227
	11th to 20th	Day	24% 4 9% 38% 22% 3	4051
	21st to end	Day	45% 7% 13% 26% 8%	4325
August	1st to 10th	Day	20% 4 15% 35% 22% 4	4062
	11th to 20th	Day	36% 5% 14% 30% 14% 1	3765
	21st to end	Day	26% 4 12% 38% 18% 3	4179
September	1st to 10th	Day	36% 3 11% 25% 18% 7%	2280
	11th to 20th	Day	36% 4 10% 20% 27% 4	2280
	21st to end	Day	31% 4 7% 24% 29% 5%	2023
October	1st to 10th	Day	17% 2 5% 16% 43% 17%	3160
	11th to 20th	Day	20% 2 3 23% 41% 11%	3140
	21st to end	Day	31% 2 5% 30% 26% 5%	3428
November	1st to 10th	Day	34% 2 7% 26% 24% 7%	1940
	11th to 20th	Day	32% 2 7% 25% 25% 9%	1800
	21st to end	Day	42% 2 7% 22% 23% 4	1780
December	1st to 10th	Day	37% 3 7% 28% 22% 2	2610
	11th to 20th	Day	42% 3 7% 27% 19% 3	3005
	21st to end	Day	50% 2 8% 22% 14% 3	3982
January	1st to 10th	Night	42% 1 8% 27% 18% 4	5888
	11th to 20th	Night	32% 2 8% 23% 31% 5%	5900
	21st to end	Night	43% 1 7% 21% 23% 4	6490
February	1st to 10th	Night	47% 2 8% 23% 17% 3	2600
	11th to 20th	Night	43% 2 8% 24% 18% 5%	2363
	21st to end	Night	42% 2 8% 20% 20% 8%	1885
March	1st to 10th	Night	47% 1 8% 15% 19% 10%	3492
	11th to 20th	Night	36% 2 9% 28% 20% 5%	3480
	21st to end	Night	41% 1 9% 29% 18% 2	3732
April	1st to 10th	Night	35% 3 10% 24% 21% 6%	1900
	11th to 20th	Night	35% 3 8% 24% 23% 8%	1875
	21st to end	Night	39% 4 10% 24% 20% 3	1900
May	1st to 10th	Night	42% 4 13% 25% 13% 3	3160
	11th to 20th	Night	38% 3 17% 26% 14% 2	2919
	21st to end	Night	40% 3 14% 27% 14% 2	2761
June	1st to 10th	Night	28% 4 13% 29% 23% 2	1520
	11th to 20th	Night	21% 4 13% 33% 26% 4	1520
	21st to end	Night	22% 4 14% 31% 20% 9%	1520
July	1st to 10th	Night	27% 6% 19% 27% 20% 2	2628
	11th to 20th	Night	21% 4 12% 37% 23% 4	2796
	21st to end	Night	43% 5% 12% 26% 14%	2999
August	1st to 10th	Night	17% 4 16% 38% 22% 3	2851
	11th to 20th	Night	26% 5% 20% 32% 17% 1	3130
	21st to end	Night	22% 4 11% 35% 24% 3	3476
September	1st to 10th	Night	30% 3 10% 27% 20% 9%	1900
	11th to 20th	Night	34% 3 9% 22% 26% 6%	1900
	21st to end	Night	28% 3 8% 23% 29% 8%	2133
October	1st to 10th	Night	14% 2 6% 17% 37% 25%	3800
	11th to 20th	Night	19% 1 4 16% 38% 22%	3779
	21st to end	Night	27% 2 5% 24% 32% 9%	4120
November	1st to 10th	Night	31% 3 7% 26% 25% 8%	2355
	11th to 20th	Night	29% 2 6% 27% 26% 10%	2600
	21st to end	Night	36% 3 8% 25% 24% 5%	2616
December	1st to 10th	Night	35% 2 7% 34% 18% 3	4580
	11th to 20th	Night	41% 2 6% 23% 21% 6%	5201
	21st to end	Night	50% 1 8% 24% 14% 3	6978

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	24% 21% 34% 16% 4	300
	11th to 20th	Day	27% 23% 34% 14% 2	300
	21st to end	Day	22% 22% 38% 14% 4	330
February	1st to 10th	Day	28% 20% 35% 12% 4 1	300
	11th to 20th	Day	31% 26% 29% 11% 3	300
	21st to end	Day	33% 25% 31% 9% 2	225
March	1st to 10th	Day	26% 17% 34% 17% 5%	270
	11th to 20th	Day	31% 18% 33% 17% 1	270
	21st to end	Day	24% 22% 35% 13% 5%	344
April	1st to 10th	Day	21% 16% 33% 20% 9% 1	460
	11th to 20th	Day	19% 18% 34% 19% 8% 1	452
	21st to end	Day	20% 14% 36% 20% 8% 2	460
May	1st to 10th	Day	16% 17% 34% 23% 9% 1	463
	11th to 20th	Day	13% 9% 32% 25% 16% 5%	612
	21st to end	Day	10% 8% 29% 31% 17% 6%	734
June	1st to 10th	Day	8% 6% 20% 30% 25% 10%	680
	11th to 20th	Day	6% 2 20% 38% 27% 8%	680
	21st to end	Day	5% 3 22% 36% 26% 9%	680
July	1st to 10th	Day	7% 3 17% 29% 33% 12%	671
	11th to 20th	Day	6% 2 14% 35% 29% 14%	668
	21st to end	Day	8% 2 13% 31% 33% 14%	739
August	1st to 10th	Day	7% 2 11% 37% 35% 8%	661
	11th to 20th	Day	14% 2 12% 30% 30% 11%	479
	21st to end	Day	9% 2 9% 30% 33% 18%	539
September	1st to 10th	Day	9% 4 10% 29% 37% 11%	490
	11th to 20th	Day	12% 3 13% 26% 28% 17%	490
	21st to end	Day	14% 5% 21% 27% 23% 10%	390
October	1st to 10th	Day	7% 6% 21% 39% 22% 5%	300
	11th to 20th	Day	15% 14% 31% 24% 13% 2	300
	21st to end	Day	26% 12% 31% 24% 6% 2	330
November	1st to 10th	Day	15% 13% 35% 23% 12% 2	300
	11th to 20th	Day	14% 17% 37% 23% 8% 2	300
	21st to end	Day	29% 13% 30% 18% 9% 2	300
December	1st to 10th	Day	20% 22% 31% 18% 8% 1	300
	11th to 20th	Day	28% 15% 30% 21% 5% 1	300
	21st to end	Day	23% 25% 35% 14% 3	330
January	1st to 10th	Night	23% 17% 32% 24% 5%	1000
	11th to 20th	Night	22% 19% 35% 21% 3	1000
	21st to end	Night	21% 14% 38% 25% 2	1100
February	1st to 10th	Night	26% 15% 31% 25% 4	1000
	11th to 20th	Night	23% 18% 36% 21% 2	807
	21st to end	Night	24% 18% 35% 21% 2	629
March	1st to 10th	Night	23% 13% 30% 31% 4	621
	11th to 20th	Night	24% 13% 33% 26% 3	570
	21st to end	Night	19% 13% 33% 28% 7%	627
April	1st to 10th	Night	14% 17% 37% 25% 7%	570
	11th to 20th	Night	16% 16% 29% 28% 10% 1	563
	21st to end	Night	17% 9% 37% 26% 10%	570
May	1st to 10th	Night	16% 9% 29% 37% 9% 1	570
	11th to 20th	Night	16% 6% 30% 29% 16% 3	561
	21st to end	Night	10% 4 23% 37% 22% 4	617
June	1st to 10th	Night	7% 3 18% 34% 33% 5%	570
	11th to 20th	Night	3 1 13% 45% 35% 3	570
	21st to end	Night	4 2 16% 40% 35% 4	570
July	1st to 10th	Night	6% 2 8% 38% 36% 10%	555
	11th to 20th	Night	5% 1 8% 36% 41% 8%	552
	21st to end	Night	6% 1 9% 40% 35% 9%	624
August	1st to 10th	Night	4 1 9% 39% 42% 6%	567
	11th to 20th	Night	6% 2 10% 41% 36% 5%	564
	21st to end	Night	7% 1 9% 32% 44% 8%	627
September	1st to 10th	Night	10% 2 9% 33% 43% 4	570
	11th to 20th	Night	12% 3 10% 31% 38% 6%	570
	21st to end	Night	8% 5% 19% 32% 33% 3	708
October	1st to 10th	Night	9% 4 17% 34% 33% 3	760
	11th to 20th	Night	13% 8% 28% 33% 17% 1	760
	21st to end	Night	20% 8% 27% 31% 14% 1	836
November	1st to 10th	Night	16% 9% 26% 34% 13% 1	780
	11th to 20th	Night	14% 10% 31% 34% 11%	800
	21st to end	Night	18% 13% 32% 27% 10%	816
December	1st to 10th	Night	21% 11% 32% 29% 6%	1000
	11th to 20th	Night	22% 11% 31% 31% 4	1000
	21st to end	Night	24% 16% 31% 24% 4	1100

Page generated at 2025-02-18 02:26:26. Version ac07

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