Shreveport
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Shreveport clear sky chart from 2005-11-06 to 2025-12-03.

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% 45%	126826
	Night	12% 6% 2 5% 4 3 4 3 5% 7% 49%	124105
Transparency	Day	37% 6% 10% 21% 19% 7%	130433
	Night	34% 5% 10% 20% 21% 9%	128574
Seeing	Day	13% 7% 20% 25% 25% 11%	16572
	Night	13% 5% 23% 34% 22% 3	26349

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% 11% 3 5% 3 3 2 2 4 5% 45%	4077
	11th to 20th	Day	15% 5% 2 3 2 3 3 3 5% 8% 52%	4080
	21st to end	Day	23% 9% 2 5% 3 2 3 2 3 4 43%	4488
February	1st to 10th	Day	21% 10% 4 5% 4 4 3 3 3 4 40%	1800
	11th to 20th	Day	20% 8% 3 6% 4 4 4 2 4 5% 39%	1904
	21st to end	Day	22% 8% 3 6% 4 4 3 2 4 5% 40%	1815
March	1st to 10th	Day	18% 11% 3 8% 4 3 3 2 3 5% 39%	4936
	11th to 20th	Day	14% 6% 2 5% 3 4 3 3 4 6% 50%	4980
	21st to end	Day	13% 9% 3 8% 4 4 4 3 5% 5% 42%	5462
April	1st to 10th	Day	13% 7% 2 6% 5% 4 4 3 5% 6% 44%	2300
	11th to 20th	Day	15% 8% 2 6% 5% 4 4 4 5% 7% 41%	2374
	21st to end	Day	11% 6% 2 6% 5% 5% 5% 3 5% 6% 45%	2400
May	1st to 10th	Day	16% 8% 3 8% 5% 5% 5% 4 5% 7% 36%	5405
	11th to 20th	Day	13% 6% 3 7% 5% 5% 6% 4 6% 8% 39%	5834
	21st to end	Day	10% 6% 3 7% 5% 5% 5% 5% 7% 9% 39%	6434
June	1st to 10th	Day	7% 5% 2 6% 6% 6% 7% 5% 7% 10% 41%	2600
	11th to 20th	Day	5% 4 2 6% 6% 6% 6% 5% 8% 10% 43%	2600
	21st to end	Day	5% 4 2 5% 5% 5% 5% 6% 8% 10% 47%	2600
July	1st to 10th	Day	8% 5% 2 7% 6% 6% 7% 6% 8% 12% 33%	5900
	11th to 20th	Day	6% 4 2 5% 4 5% 5% 4 8% 10% 49%	5900
	21st to end	Day	11% 7% 3 7% 5% 5% 4 4 6% 8% 41%	6422
August	1st to 10th	Day	2 2 1 3 3 3 3 3 5% 8% 68%	4234
	11th to 20th	Day	4 2 1 4 3 4 5% 4 7% 11% 54%	3912
	21st to end	Day	7% 5% 3 6% 5% 6% 7% 5% 7% 9% 41%	4312
September	1st to 10th	Day	7% 5% 2 5% 4 5% 5% 5% 6% 8% 47%	2400
	11th to 20th	Day	11% 6% 2 5% 5% 4 5% 4 7% 7% 44%	2240
	21st to end	Day	7% 4 2 4 4 4 4 3 6% 8% 54%	2159
October	1st to 10th	Day	6% 3 2 4 3 3 4 3 5% 7% 62%	2000
	11th to 20th	Day	12% 5% 2 4 2 2 3 2 4 6% 57%	2000
	21st to end	Day	16% 5% 2 5% 3 3 3 2 4 4 54%	2200
November	1st to 10th	Day	12% 6% 2 4 4 4 3 3 5% 6% 50%	2058
	11th to 20th	Day	11% 5% 3 5% 4 3 3 3 4 6% 53%	2100
	21st to end	Day	18% 7% 2 6% 3 4 4 3 4 5% 44%	2063
December	1st to 10th	Day	18% 7% 2 6% 3 3 3 2 3 6% 48%	2958
	11th to 20th	Day	18% 9% 3 6% 4 4 4 4 4 5% 40%	3391
	21st to end	Day	16% 8% 3 7% 4 3 3 3 4 5% 44%	4488
January	1st to 10th	Night	17% 5% 2 5% 2 3 3 2 4 5% 52%	5888
	11th to 20th	Night	14% 5% 2 4 3 2 2 2 4 7% 54%	5900
	21st to end	Night	25% 9% 3 7% 3 3 2 2 3 3 40%	6490
February	1st to 10th	Night	17% 8% 2 5% 3 3 3 3 4 5% 46%	2600
	11th to 20th	Night	21% 7% 2 5% 4 3 3 3 3 5% 43%	2396
	21st to end	Night	20% 8% 2 6% 4 3 3 2 3 5% 45%	1815
March	1st to 10th	Night	19% 8% 2 5% 4 3 4 4 5% 6% 41%	4919
	11th to 20th	Night	13% 6% 2 5% 3 3 4 3 5% 7% 48%	4980
	21st to end	Night	14% 7% 2 7% 4 4 4 3 5% 5% 43%	5467
April	1st to 10th	Night	12% 5% 2 4 4 4 4 4 5% 7% 49%	2099
	11th to 20th	Night	11% 6% 3 5% 5% 3 4 4 6% 7% 47%	1975
	21st to end	Night	11% 6% 2 5% 4 3 4 2 5% 8% 49%	2000
May	1st to 10th	Night	14% 8% 3 8% 5% 4 4 4 6% 7% 37%	4490
	11th to 20th	Night	14% 7% 3 7% 4 4 4 4 6% 8% 39%	4063
	21st to end	Night	10% 6% 2 6% 4 4 5% 4 7% 8% 45%	4443
June	1st to 10th	Night	4 4 2 5% 4 3 4 5% 6% 12% 51%	1800
	11th to 20th	Night	5% 3 1 4 5% 4 4 4 5% 10% 54%	1800
	21st to end	Night	4 4 2 5% 4 4 3 4 7% 9% 54%	1800
July	1st to 10th	Night	6% 5% 2 7% 6% 5% 6% 6% 9% 12% 36%	4078
	11th to 20th	Night	4 2 1 5% 3 3 5% 5% 7% 13% 53%	4077
	21st to end	Night	10% 6% 3 6% 4 4 3 3 6% 9% 45%	4449
August	1st to 10th	Night	2 1 2 2 2 3 3 5% 8% 72%	2926
	11th to 20th	Night	3 2 1 3 3 3 4 5% 7% 12% 59%	3135
	21st to end	Night	5% 3 2 6% 5% 5% 5% 5% 7% 8% 48%	3586
September	1st to 10th	Night	7% 4 2 6% 4 4 4 3 6% 8% 53%	2000
	11th to 20th	Night	10% 4 2 5% 4 4 4 4 6% 7% 50%	2154
	21st to end	Night	7% 3 1 4 3 4 4 3 5% 7% 58%	2220
October	1st to 10th	Night	6% 3 1 4 3 3 3 3 5% 6% 63%	2400
	11th to 20th	Night	10% 5% 1 4 3 2 3 2 4 5% 61%	2400
	21st to end	Night	14% 4 1 4 3 4 3 2 3 4 57%	2640
November	1st to 10th	Night	11% 5% 2 4 3 3 3 2 4 6% 57%	2460
	11th to 20th	Night	10% 5% 2 5% 4 3 3 3 4 5% 56%	2520
	21st to end	Night	14% 7% 2 6% 3 3 3 3 5% 5% 49%	2552
December	1st to 10th	Night	18% 6% 2 5% 3 3 3 3 4 5% 47%	4277
	11th to 20th	Night	15% 9% 3 6% 5% 5% 4 3 4 4 44%	4816
	21st to end	Night	15% 9% 3 5% 4 3 3 2 4 4 48%	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	43% 2 6% 24% 21% 3	4078
	11th to 20th	Day	32% 2 7% 24% 26% 9%	4080
	21st to end	Day	47% 2 4 14% 20% 14%	4488
February	1st to 10th	Day	49% 4 6% 15% 17% 9%	1800
	11th to 20th	Day	49% 4 5% 16% 19% 7%	1913
	21st to end	Day	48% 4 7% 10% 21% 10%	1815
March	1st to 10th	Day	50% 3 5% 12% 18% 12%	4936
	11th to 20th	Day	36% 4 4 16% 22% 17%	4980
	21st to end	Day	44% 4 9% 20% 19% 4	5464
April	1st to 10th	Day	41% 5% 8% 21% 17% 8%	2300
	11th to 20th	Day	43% 6% 7% 16% 20% 8%	2374
	21st to end	Day	38% 7% 9% 20% 22% 4	2400
May	1st to 10th	Day	46% 6% 10% 25% 11% 2	5440
	11th to 20th	Day	42% 6% 12% 19% 19% 2	5838
	21st to end	Day	39% 8% 12% 22% 16% 3	6447
June	1st to 10th	Day	35% 10% 14% 25% 15% 1	2600
	11th to 20th	Day	32% 9% 15% 24% 17% 3	2600
	21st to end	Day	29% 10% 16% 27% 16% 3	2600
July	1st to 10th	Day	39% 12% 21% 22% 6%	5836
	11th to 20th	Day	27% 8% 19% 34% 12%	5831
	21st to end	Day	39% 7% 14% 28% 11%	6240
August	1st to 10th	Day	16% 6% 14% 31% 29% 5%	4220
	11th to 20th	Day	23% 7% 20% 36% 13% 1	3949
	21st to end	Day	36% 9% 14% 19% 20% 1	4311
September	1st to 10th	Day	33% 8% 13% 18% 19% 9%	2400
	11th to 20th	Day	37% 8% 12% 19% 18% 6%	2240
	21st to end	Day	28% 5% 10% 22% 25% 10%	2159
October	1st to 10th	Day	15% 3 7% 13% 25% 37%	3260
	11th to 20th	Day	19% 2 5% 17% 32% 25%	3240
	21st to end	Day	27% 4 5% 19% 33% 12%	3538
November	1st to 10th	Day	33% 6% 9% 18% 25% 10%	2058
	11th to 20th	Day	33% 4 7% 18% 26% 12%	2100
	21st to end	Day	43% 4 5% 18% 23% 7%	2063
December	1st to 10th	Day	41% 3 6% 21% 24% 5%	2958
	11th to 20th	Day	46% 5% 6% 15% 20% 9%	3389
	21st to end	Day	43% 4 5% 18% 26% 4	4488
January	1st to 10th	Night	36% 3 6% 24% 26% 5%	5888
	11th to 20th	Night	32% 3 5% 18% 31% 10%	5900
	21st to end	Night	51% 2 5% 12% 18% 11%	6490
February	1st to 10th	Night	41% 4 7% 18% 19% 11%	2600
	11th to 20th	Night	45% 3 7% 16% 20% 9%	2397
	21st to end	Night	44% 3 7% 14% 17% 15%	1815
March	1st to 10th	Night	45% 4 6% 12% 22% 13%	4919
	11th to 20th	Night	35% 4 7% 15% 19% 19%	4980
	21st to end	Night	41% 5% 9% 17% 21% 6%	5467
April	1st to 10th	Night	34% 6% 11% 21% 17% 11%	2099
	11th to 20th	Night	35% 6% 10% 18% 20% 12%	1975
	21st to end	Night	33% 5% 10% 23% 25% 4	2000
May	1st to 10th	Night	45% 7% 10% 22% 12% 4	4520
	11th to 20th	Night	41% 7% 13% 18% 19% 2	4064
	21st to end	Night	34% 8% 15% 25% 13% 5%	4452
June	1st to 10th	Night	25% 9% 16% 28% 19% 2	1800
	11th to 20th	Night	26% 7% 16% 28% 19% 5%	1800
	21st to end	Night	25% 7% 17% 25% 23% 4	1800
July	1st to 10th	Night	36% 11% 24% 24% 5% 1	4035
	11th to 20th	Night	22% 8% 26% 31% 13% 1	4026
	21st to end	Night	36% 6% 18% 28% 11% 1	4320
August	1st to 10th	Night	11% 5% 16% 31% 32% 5%	2916
	11th to 20th	Night	18% 6% 17% 43% 14% 2	3164
	21st to end	Night	30% 8% 15% 23% 22% 2	3586
September	1st to 10th	Night	30% 7% 14% 19% 19% 11%	2000
	11th to 20th	Night	32% 7% 12% 21% 19% 9%	2154
	21st to end	Night	25% 5% 11% 21% 27% 11%	2220
October	1st to 10th	Night	14% 3 5% 14% 21% 42%	3920
	11th to 20th	Night	17% 2 4 16% 32% 28%	3899
	21st to end	Night	24% 3 5% 16% 35% 16%	4252
November	1st to 10th	Night	30% 4 9% 17% 28% 12%	2460
	11th to 20th	Night	31% 4 8% 17% 26% 14%	2520
	21st to end	Night	37% 4 7% 18% 24% 9%	2552
December	1st to 10th	Night	40% 4 6% 17% 27% 5%	4277
	11th to 20th	Night	44% 4 8% 13% 22% 10%	4817
	21st to end	Night	40% 3 6% 17% 28% 5%	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	20% 13% 40% 18% 9%	300
	11th to 20th	Day	25% 14% 33% 21% 6% 1	300
	21st to end	Day	21% 15% 37% 22% 5%	330
February	1st to 10th	Day	26% 11% 34% 23% 6% 1	300
	11th to 20th	Day	30% 18% 35% 14% 3	300
	21st to end	Day	29% 18% 35% 13% 3 1	249
March	1st to 10th	Day	25% 16% 32% 20% 7%	300
	11th to 20th	Day	19% 21% 34% 22% 4 1	300
	21st to end	Day	15% 19% 39% 20% 6% 1	330
April	1st to 10th	Day	19% 14% 36% 23% 9% 1	400
	11th to 20th	Day	18% 14% 31% 23% 13% 1	492
	21st to end	Day	14% 9% 30% 30% 15% 2	500
May	1st to 10th	Day	15% 9% 29% 32% 13% 1	503
	11th to 20th	Day	15% 6% 22% 32% 20% 5%	710
	21st to end	Day	10% 6% 20% 34% 24% 6%	789
June	1st to 10th	Day	7% 2 12% 32% 35% 11%	730
	11th to 20th	Day	5% 2 13% 31% 38% 11%	730
	21st to end	Day	5% 1 9% 26% 39% 19%	730
July	1st to 10th	Day	8% 1 7% 25% 40% 20%	721
	11th to 20th	Day	5% 1 6% 22% 42% 24%	718
	21st to end	Day	8% 1 5% 23% 43% 20%	794
August	1st to 10th	Day	5% 1 5% 19% 47% 24%	726
	11th to 20th	Day	7% 1 4 17% 48% 24%	558
	21st to end	Day	11% 2 5% 18% 36% 28%	583
September	1st to 10th	Day	8% 1 7% 22% 37% 25%	530
	11th to 20th	Day	10% 1 6% 24% 34% 25%	370
	21st to end	Day	8% 4 8% 31% 34% 15%	330
October	1st to 10th	Day	6% 2 16% 33% 31% 12%	330
	11th to 20th	Day	9% 5% 26% 32% 20% 8%	330
	21st to end	Day	21% 8% 26% 24% 14% 6%	363
November	1st to 10th	Day	13% 6% 26% 29% 22% 3	330
	11th to 20th	Day	12% 9% 31% 33% 14% 2	330
	21st to end	Day	19% 12% 32% 21% 15% 1	330
December	1st to 10th	Day	17% 10% 40% 21% 9% 3	306
	11th to 20th	Day	22% 12% 32% 25% 8% 1	300
	21st to end	Day	18% 15% 39% 20% 6% 2	330
January	1st to 10th	Night	21% 8% 32% 33% 7%	1000
	11th to 20th	Night	21% 10% 33% 28% 8% 1	1000
	21st to end	Night	22% 7% 34% 32% 4	1100
February	1st to 10th	Night	21% 9% 33% 32% 5%	1000
	11th to 20th	Night	26% 8% 33% 28% 5%	842
	21st to end	Night	24% 12% 35% 26% 3	495
March	1st to 10th	Night	20% 7% 32% 35% 6%	600
	11th to 20th	Night	17% 10% 33% 33% 6% 1	600
	21st to end	Night	16% 7% 35% 35% 7%	660
April	1st to 10th	Night	14% 10% 36% 33% 8%	600
	11th to 20th	Night	13% 10% 35% 30% 11% 1	593
	21st to end	Night	13% 7% 35% 32% 12% 1	600
May	1st to 10th	Night	11% 6% 32% 38% 13% 1	600
	11th to 20th	Night	12% 6% 22% 40% 18% 2	591
	21st to end	Night	7% 3 19% 42% 25% 4	650
June	1st to 10th	Night	4 2 10% 42% 39% 3	600
	11th to 20th	Night	3 3 9% 42% 40% 3	600
	21st to end	Night	5% 1 9% 33% 45% 7%	600
July	1st to 10th	Night	4 1 3 31% 50% 10%	585
	11th to 20th	Night	3 1 4 30% 52% 10%	582
	21st to end	Night	4 1 5% 28% 51% 11%	657
August	1st to 10th	Night	3 1 3 26% 57% 11%	597
	11th to 20th	Night	5% 1 4 27% 56% 8%	594
	21st to end	Night	7% 2 4 28% 49% 10%	660
September	1st to 10th	Night	7% 1 6% 32% 46% 8%	600
	11th to 20th	Night	11% 1 6% 29% 46% 8%	600
	21st to end	Night	8% 2 9% 37% 40% 5%	620
October	1st to 10th	Night	7% 1 10% 40% 38% 5%	800
	11th to 20th	Night	12% 3 18% 40% 24% 2	800
	21st to end	Night	14% 5% 23% 37% 18% 2	880
November	1st to 10th	Night	12% 4 21% 40% 21% 2	820
	11th to 20th	Night	10% 6% 26% 42% 15% 1	840
	21st to end	Night	17% 8% 29% 32% 13% 1	872
December	1st to 10th	Night	18% 7% 29% 37% 9%	1011
	11th to 20th	Night	21% 7% 29% 35% 8%	1000
	21st to end	Night	20% 7% 32% 32% 9%	1100

Page generated at 2025-11-30 00:00:51. Version ac07

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