Batesburg-Leesville High School
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Batesburg-Leesville High School clear sky chart from 2005-11-06 to 2026-09-29.

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 5% 5% 4 6% 8% 41%	148932
	Night	12% 6% 2 6% 4 4 4 4 6% 8% 43%	142488
Transparency	Day	40% 5% 13% 20% 17% 6%	152617
	Night	39% 5% 12% 19% 19% 7%	146875
Seeing	Day	15% 10% 24% 24% 19% 8%	17834
	Night	15% 9% 25% 31% 18% 3	27851

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% 4 2 4 3 4 4 3 5% 7% 50%	5258
	11th to 20th	Day	11% 5% 2 4 2 2 3 2 3 5% 60%	5280
	21st to end	Day	18% 8% 3 7% 4 4 4 3 4 5% 40%	5780
February	1st to 10th	Day	14% 7% 2 5% 5% 4 4 4 6% 7% 42%	1953
	11th to 20th	Day	20% 7% 2 6% 3 3 3 2 4 6% 43%	2048
	21st to end	Day	18% 7% 3 6% 4 4 4 3 4 6% 43%	1763
March	1st to 10th	Day	20% 9% 3 7% 4 3 3 2 4 5% 40%	5045
	11th to 20th	Day	8% 4 2 5% 3 4 4 3 5% 7% 55%	5090
	21st to end	Day	15% 7% 3 7% 4 4 4 3 4 4 46%	5586
April	1st to 10th	Day	10% 5% 2 4 4 4 5% 4 6% 7% 49%	2310
	11th to 20th	Day	10% 5% 2 5% 4 4 4 3 6% 6% 50%	2431
	21st to end	Day	9% 5% 2 4 4 4 5% 4 6% 8% 48%	2693
May	1st to 10th	Day	13% 7% 3 6% 4 4 5% 4 6% 8% 39%	7616
	11th to 20th	Day	13% 6% 3 6% 4 5% 5% 4 7% 8% 38%	7626
	21st to end	Day	13% 7% 3 7% 5% 6% 5% 5% 6% 8% 35%	8391
June	1st to 10th	Day	10% 5% 2 8% 5% 5% 5% 5% 9% 10% 35%	2730
	11th to 20th	Day	6% 6% 2 5% 5% 5% 6% 5% 9% 10% 41%	2730
	21st to end	Day	4 5% 2 6% 5% 6% 7% 5% 10% 13% 38%	2730
July	1st to 10th	Day	8% 6% 2 7% 5% 6% 7% 6% 9% 13% 31%	7680
	11th to 20th	Day	5% 5% 2 6% 6% 7% 8% 7% 10% 14% 29%	7680
	21st to end	Day	7% 6% 3 8% 6% 7% 8% 7% 10% 14% 25%	8340
August	1st to 10th	Day	17% 7% 3 8% 6% 7% 8% 5% 8% 11% 20%	6014
	11th to 20th	Day	7% 4 2 6% 5% 5% 6% 6% 9% 12% 39%	5951
	21st to end	Day	9% 5% 2 7% 5% 5% 5% 5% 8% 10% 39%	6036
September	1st to 10th	Day	6% 6% 2 7% 6% 5% 5% 5% 7% 10% 42%	2310
	11th to 20th	Day	13% 7% 2 6% 5% 4 4 4 6% 8% 41%	2310
	21st to end	Day	16% 7% 2 6% 4 4 3 4 5% 7% 42%	2288
October	1st to 10th	Day	12% 6% 2 6% 3 3 3 3 5% 6% 50%	2120
	11th to 20th	Day	12% 4 2 4 3 2 3 2 3 5% 60%	2000
	21st to end	Day	12% 5% 2 4 4 3 3 2 4 5% 57%	2200
November	1st to 10th	Day	13% 6% 2 5% 3 4 3 3 4 5% 54%	2057
	11th to 20th	Day	13% 5% 2 4 3 2 3 3 4 6% 55%	1948
	21st to end	Day	13% 6% 2 6% 4 4 4 3 4 6% 50%	1890
December	1st to 10th	Day	12% 6% 2 5% 4 4 4 3 5% 5% 49%	3020
	11th to 20th	Day	14% 6% 2 6% 3 4 3 3 5% 6% 47%	3463
	21st to end	Day	20% 6% 2 5% 3 3 3 2 5% 6% 45%	4565
January	1st to 10th	Night	11% 6% 2 6% 3 4 3 3 4 5% 53%	7635
	11th to 20th	Night	11% 6% 2 5% 3 3 4 3 5% 6% 52%	7680
	21st to end	Night	18% 9% 2 6% 4 3 3 2 3 5% 44%	8401
February	1st to 10th	Night	15% 6% 3 6% 4 3 4 3 5% 6% 47%	2665
	11th to 20th	Night	19% 7% 3 5% 4 4 3 3 4 5% 44%	2458
	21st to end	Night	15% 6% 2 5% 4 4 4 3 5% 6% 46%	2041
March	1st to 10th	Night	19% 8% 3 6% 4 4 4 3 4 6% 40%	5028
	11th to 20th	Night	11% 3 1 4 3 3 3 4 5% 7% 55%	5090
	21st to end	Night	14% 5% 2 5% 4 4 4 4 5% 7% 48%	5588
April	1st to 10th	Night	10% 5% 2 5% 4 4 4 3 6% 7% 50%	2310
	11th to 20th	Night	10% 5% 2 5% 4 3 4 3 4 7% 54%	2137
	21st to end	Night	7% 4 1 5% 5% 3 3 4 5% 7% 53%	1943
May	1st to 10th	Night	11% 8% 3 8% 5% 5% 5% 4 7% 9% 37%	5237
	11th to 20th	Night	14% 6% 2 5% 4 4 5% 5% 6% 9% 40%	5234
	21st to end	Night	14% 8% 3 7% 5% 5% 5% 5% 6% 8% 36%	5761
June	1st to 10th	Night	10% 7% 3 8% 6% 5% 5% 5% 7% 10% 33%	1890
	11th to 20th	Night	7% 6% 2 6% 5% 5% 5% 4 7% 10% 41%	1890
	21st to end	Night	5% 5% 1 7% 6% 6% 6% 6% 10% 12% 36%	1890
July	1st to 10th	Night	8% 8% 3 8% 6% 5% 6% 5% 8% 12% 30%	5278
	11th to 20th	Night	7% 6% 2 8% 5% 5% 8% 6% 11% 14% 28%	5277
	21st to end	Night	9% 10% 3 11% 6% 6% 6% 6% 8% 12% 22%	5736
August	1st to 10th	Night	18% 9% 3 9% 5% 6% 7% 5% 8% 10% 19%	4135
	11th to 20th	Night	7% 5% 2 6% 5% 4 5% 4 9% 15% 37%	4095
	21st to end	Night	8% 6% 2 6% 4 4 5% 4 6% 9% 45%	5037
September	1st to 10th	Night	9% 6% 3 5% 5% 4 6% 5% 7% 10% 42%	2310
	11th to 20th	Night	11% 7% 3 7% 5% 4 4 4 6% 7% 41%	2310
	21st to end	Night	15% 6% 2 6% 4 4 4 3 4 7% 44%	2289
October	1st to 10th	Night	11% 6% 2 6% 3 4 3 3 4 7% 51%	2280
	11th to 20th	Night	13% 5% 1 4 3 3 3 3 5% 6% 56%	2400
	21st to end	Night	11% 5% 2 5% 3 3 3 3 4 5% 57%	2640
November	1st to 10th	Night	12% 6% 2 5% 3 3 3 2 4 5% 55%	2461
	11th to 20th	Night	13% 6% 2 4 3 3 3 3 4 6% 53%	2667
	21st to end	Night	13% 5% 2 5% 4 3 4 3 5% 7% 49%	2730
December	1st to 10th	Night	13% 6% 2 5% 3 3 3 3 4 6% 53%	4380
	11th to 20th	Night	16% 7% 3 6% 3 3 3 2 5% 6% 46%	4952
	21st to end	Night	19% 7% 2 6% 3 4 4 3 4 5% 43%	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	34% 3 9% 25% 23% 6%	5259
	11th to 20th	Day	30% 2 4 14% 36% 14%	5280
	21st to end	Day	47% 2 4 16% 20% 11%	5780
February	1st to 10th	Day	40% 4 10% 21% 19% 6%	1953
	11th to 20th	Day	43% 3 5% 19% 24% 5%	2058
	21st to end	Day	43% 5% 7% 14% 21% 9%	1763
March	1st to 10th	Day	48% 3 6% 13% 21% 10%	5045
	11th to 20th	Day	29% 4 8% 15% 25% 18%	5090
	21st to end	Day	42% 3 7% 19% 22% 8%	5586
April	1st to 10th	Day	33% 5% 10% 20% 26% 6%	2310
	11th to 20th	Day	32% 5% 10% 21% 22% 10%	2431
	21st to end	Day	32% 7% 10% 27% 21% 4	2693
May	1st to 10th	Day	42% 5% 15% 24% 12% 2	7651
	11th to 20th	Day	42% 4 17% 21% 14% 2	7630
	21st to end	Day	45% 7% 15% 15% 16% 2	8405
June	1st to 10th	Day	40% 10% 16% 21% 10% 2	2730
	11th to 20th	Day	34% 9% 18% 26% 13% 1	2730
	21st to end	Day	34% 11% 17% 23% 13% 2	2730
July	1st to 10th	Day	43% 6% 22% 23% 5% 1	7615
	11th to 20th	Day	43% 8% 28% 18% 2	7611
	21st to end	Day	46% 8% 20% 17% 7% 1	8156
August	1st to 10th	Day	56% 7% 22% 12% 3	6001
	11th to 20th	Day	37% 5% 22% 25% 11%	5990
	21st to end	Day	40% 4 14% 26% 15% 1	6036
September	1st to 10th	Day	35% 10% 15% 19% 17% 4	2310
	11th to 20th	Day	41% 7% 11% 19% 19% 3	2310
	21st to end	Day	42% 6% 10% 19% 18% 6%	2288
October	1st to 10th	Day	34% 3 5% 17% 31% 10%	3458
	11th to 20th	Day	19% 2 4 17% 27% 30%	3240
	21st to end	Day	28% 2 3 20% 32% 15%	3538
November	1st to 10th	Day	35% 3 7% 18% 25% 13%	2057
	11th to 20th	Day	31% 4 7% 20% 26% 11%	1948
	21st to end	Day	36% 4 9% 19% 23% 9%	1890
December	1st to 10th	Day	37% 3 6% 18% 27% 9%	3020
	11th to 20th	Day	39% 2 10% 22% 20% 7%	3460
	21st to end	Day	40% 3 7% 23% 24% 2	4565
January	1st to 10th	Night	34% 3 7% 23% 27% 5%	7636
	11th to 20th	Night	33% 3 5% 16% 32% 11%	7680
	21st to end	Night	45% 3 4 15% 24% 10%	8401
February	1st to 10th	Night	39% 3 8% 20% 21% 8%	2665
	11th to 20th	Night	43% 4 6% 18% 21% 8%	2459
	21st to end	Night	39% 5% 8% 17% 19% 12%	2041
March	1st to 10th	Night	45% 4 8% 12% 24% 7%	5028
	11th to 20th	Night	28% 4 7% 13% 29% 19%	5090
	21st to end	Night	37% 4 7% 20% 20% 12%	5588
April	1st to 10th	Night	33% 4 12% 20% 22% 8%	2310
	11th to 20th	Night	31% 5% 8% 22% 24% 11%	2137
	21st to end	Night	29% 5% 10% 27% 23% 5%	1943
May	1st to 10th	Night	43% 5% 15% 23% 12% 2	5264
	11th to 20th	Night	40% 5% 18% 21% 14% 1	5235
	21st to end	Night	44% 8% 13% 18% 15% 2	5771
June	1st to 10th	Night	42% 10% 15% 20% 12% 2	1890
	11th to 20th	Night	36% 9% 18% 24% 12% 2	1890
	21st to end	Night	35% 12% 19% 21% 11% 2	1890
July	1st to 10th	Night	46% 6% 23% 19% 5% 1	5235
	11th to 20th	Night	43% 10% 31% 13% 2 1	5226
	21st to end	Night	53% 8% 19% 13% 6% 1	5606
August	1st to 10th	Night	59% 8% 19% 11% 3	4124
	11th to 20th	Night	36% 5% 26% 26% 7%	4122
	21st to end	Night	36% 6% 15% 28% 14% 2	5037
September	1st to 10th	Night	36% 8% 15% 23% 13% 5%	2310
	11th to 20th	Night	41% 8% 11% 19% 18% 3	2310
	21st to end	Night	39% 6% 13% 19% 17% 5%	2289
October	1st to 10th	Night	35% 3 8% 17% 31% 7%	3722
	11th to 20th	Night	19% 3 5% 16% 26% 32%	3899
	21st to end	Night	26% 2 5% 19% 29% 19%	4252
November	1st to 10th	Night	33% 4 7% 16% 27% 13%	2461
	11th to 20th	Night	33% 3 7% 17% 26% 13%	2667
	21st to end	Night	34% 4 9% 18% 24% 10%	2730
December	1st to 10th	Night	35% 3 6% 16% 31% 9%	4380
	11th to 20th	Night	40% 2 11% 18% 20% 9%	4954
	21st to end	Night	43% 3 5% 24% 21% 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	17% 25% 41% 14% 3	330
	11th to 20th	Day	22% 24% 35% 18% 2	330
	21st to end	Day	22% 25% 39% 12% 2	363
February	1st to 10th	Day	16% 24% 40% 16% 4	330
	11th to 20th	Day	33% 21% 33% 12% 1	330
	21st to end	Day	26% 22% 34% 13% 5%	306
March	1st to 10th	Day	19% 20% 31% 21% 9%	540
	11th to 20th	Day	18% 19% 40% 17% 6%	540
	21st to end	Day	18% 18% 38% 19% 8%	594
April	1st to 10th	Day	18% 16% 33% 22% 10% 1	540
	11th to 20th	Day	12% 14% 32% 24% 15% 3	532
	21st to end	Day	12% 10% 31% 27% 17% 3	540
May	1st to 10th	Day	12% 12% 34% 26% 13% 3	543
	11th to 20th	Day	17% 5% 21% 32% 17% 8%	567
	21st to end	Day	15% 7% 17% 27% 23% 11%	617
June	1st to 10th	Day	13% 5% 15% 33% 25% 10%	570
	11th to 20th	Day	8% 4 18% 29% 28% 13%	570
	21st to end	Day	7% 2 14% 34% 29% 15%	570
July	1st to 10th	Day	9% 2 9% 25% 32% 23%	565
	11th to 20th	Day	7% 2 10% 23% 38% 20%	564
	21st to end	Day	8% 1 11% 32% 33% 14%	620
August	1st to 10th	Day	19% 3 11% 24% 29% 14%	566
	11th to 20th	Day	12% 4 10% 23% 33% 18%	559
	21st to end	Day	14% 2 11% 27% 30% 16%	627
September	1st to 10th	Day	9% 3 13% 31% 32% 13%	570
	11th to 20th	Day	16% 3 12% 27% 29% 13%	570
	21st to end	Day	21% 2 16% 27% 27% 8%	562
October	1st to 10th	Day	15% 6% 23% 30% 18% 8%	530
	11th to 20th	Day	12% 6% 24% 31% 20% 6%	530
	21st to end	Day	14% 9% 28% 27% 17% 5%	583
November	1st to 10th	Day	19% 9% 27% 25% 15% 5%	535
	11th to 20th	Day	16% 12% 39% 23% 7% 2	388
	21st to end	Day	11% 16% 39% 24% 9% 1	330
December	1st to 10th	Day	25% 19% 34% 17% 4	330
	11th to 20th	Day	21% 14% 41% 17% 7% 1	330
	21st to end	Day	26% 18% 32% 16% 5% 2	363
January	1st to 10th	Night	19% 16% 34% 25% 6%	840
	11th to 20th	Night	16% 17% 34% 26% 6%	840
	21st to end	Night	19% 17% 38% 22% 3	924
February	1st to 10th	Night	18% 14% 36% 28% 4	840
	11th to 20th	Night	21% 18% 35% 24% 2	823
	21st to end	Night	17% 18% 36% 25% 3	692
March	1st to 10th	Night	17% 12% 34% 31% 6%	840
	11th to 20th	Night	17% 13% 39% 24% 7%	840
	21st to end	Night	14% 15% 38% 25% 7%	924
April	1st to 10th	Night	14% 15% 32% 29% 9%	840
	11th to 20th	Night	13% 12% 31% 32% 12%	831
	21st to end	Night	9% 9% 31% 38% 13%	683
May	1st to 10th	Night	12% 7% 32% 37% 12%	630
	11th to 20th	Night	11% 4 30% 34% 18% 2	621
	21st to end	Night	11% 4 17% 38% 27% 4	683
June	1st to 10th	Night	12% 2 22% 37% 23% 4	630
	11th to 20th	Night	10% 3 14% 35% 29% 9%	630
	21st to end	Night	8% 2 12% 40% 32% 7%	630
July	1st to 10th	Night	9% 1 9% 36% 37% 7%	615
	11th to 20th	Night	11% 2 6% 34% 39% 9%	612
	21st to end	Night	8% 2 11% 35% 38% 6%	690
August	1st to 10th	Night	16% 2 8% 30% 37% 7%	627
	11th to 20th	Night	16% 1 7% 32% 38% 6%	624
	21st to end	Night	13% 2 11% 32% 38% 5%	845
September	1st to 10th	Night	11% 2 11% 35% 36% 5%	840
	11th to 20th	Night	15% 2 13% 28% 38% 4	840
	21st to end	Night	18% 3 15% 33% 27% 5%	833
October	1st to 10th	Night	14% 5% 19% 33% 26% 4	800
	11th to 20th	Night	15% 6% 23% 31% 22% 3	800
	21st to end	Night	13% 8% 25% 32% 21% 2	880
November	1st to 10th	Night	15% 8% 24% 33% 18% 3	820
	11th to 20th	Night	15% 10% 31% 31% 11% 1	840
	21st to end	Night	14% 10% 31% 29% 14% 1	840
December	1st to 10th	Night	19% 12% 28% 31% 9% 1	840
	11th to 20th	Night	19% 10% 27% 33% 10% 1	840
	21st to end	Night	24% 12% 27% 30% 7%	924

Page generated at 2026-09-26 04:18:43. Version ac07

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