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 2024-01-13.

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% 3 5% 5% 3 5% 5% 6% 7% 44%	75006
	Night	12% 5% 2 4 4 3 4 4 5% 7% 50%	74746
Transparency	Day	38% 7% 11% 20% 19% 6%	74730
	Night	34% 6% 11% 20% 22% 9%	74542
Seeing	Day	13% 6% 19% 25% 26% 11%	13995
	Night	14% 5% 22% 34% 22% 3	23919

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	16% 10% 3 5% 5% 2 3 2 3 6% 45%	1707
	11th to 20th	Day	20% 6% 3 4 4 1 4 4 4 4 46%	1638
	21st to end	Day	18% 7% 2 5% 4 2 3 3 4 4 47%	1782
February	1st to 10th	Day	21% 9% 4 5% 4 3 3 4 3 4 40%	1620
	11th to 20th	Day	21% 7% 3 6% 4 3 5% 3 3 6% 39%	1709
	21st to end	Day	24% 7% 3 5% 4 3 3 3 4 6% 38%	1628
March	1st to 10th	Day	18% 8% 4 5% 6% 3 4 4 4 6% 39%	1980
	11th to 20th	Day	19% 7% 3 5% 5% 3 4 4 5% 7% 39%	1980
	21st to end	Day	13% 7% 4 6% 5% 3 4 4 4 5% 44%	2178
April	1st to 10th	Day	12% 7% 3 6% 5% 3 5% 4 5% 6% 45%	2070
	11th to 20th	Day	15% 7% 2 5% 5% 3 4 5% 5% 7% 41%	2134
	21st to end	Day	11% 6% 3 5% 6% 3 6% 4 5% 6% 46%	2160
May	1st to 10th	Day	12% 5% 3 6% 6% 3 5% 4 5% 7% 43%	2160
	11th to 20th	Day	11% 5% 3 5% 6% 4 6% 6% 6% 7% 41%	2288
	21st to end	Day	9% 5% 3 6% 5% 3 6% 6% 8% 10% 39%	2531
June	1st to 10th	Day	7% 4 2 5% 7% 4 7% 7% 7% 9% 41%	2340
	11th to 20th	Day	5% 3 2 5% 7% 5% 6% 6% 8% 10% 43%	2340
	21st to end	Day	6% 3 2 4 5% 3 6% 7% 8% 10% 45%	2340
July	1st to 10th	Day	9% 4 2 5% 7% 5% 6% 7% 8% 12% 36%	2340
	11th to 20th	Day	6% 3 2 5% 6% 4 6% 6% 9% 10% 44%	2340
	21st to end	Day	7% 4 2 6% 7% 4 6% 6% 8% 11% 40%	2546
August	1st to 10th	Day	4 3 2 4 5% 3 5% 6% 7% 12% 48%	2328
	11th to 20th	Day	7% 4 2 5% 6% 4 6% 7% 8% 9% 45%	2160
	21st to end	Day	10% 4 3 5% 6% 4 6% 7% 8% 10% 38%	2376
September	1st to 10th	Day	8% 5% 2 4 5% 4 5% 6% 6% 8% 47%	2160
	11th to 20th	Day	11% 5% 3 5% 6% 4 5% 5% 6% 7% 43%	2016
	21st to end	Day	7% 4 2 3 5% 3 4 4 6% 7% 54%	1944
October	1st to 10th	Day	7% 3 2 3 4 2 4 4 5% 7% 60%	1800
	11th to 20th	Day	14% 5% 2 4 3 2 3 4 4 6% 54%	1800
	21st to end	Day	17% 5% 2 4 3 2 3 3 3 4 54%	1980
November	1st to 10th	Day	11% 5% 2 3 4 3 4 4 5% 7% 52%	1858
	11th to 20th	Day	12% 5% 3 4 5% 2 4 4 4 6% 52%	1900
	21st to end	Day	19% 7% 3 5% 4 3 4 3 4 5% 44%	1867
December	1st to 10th	Day	14% 8% 3 6% 4 2 4 3 4 6% 45%	1710
	11th to 20th	Day	17% 8% 3 5% 4 3 4 4 5% 5% 42%	2161
	21st to end	Day	15% 9% 3 6% 5% 3 4 4 4 5% 41%	3135
January	1st to 10th	Night	18% 6% 2 5% 3 2 3 3 4 5% 48%	2458
	11th to 20th	Night	20% 7% 2 4 4 2 3 4 4 5% 46%	2367
	21st to end	Night	18% 6% 2 5% 4 2 3 3 3 4 48%	2574
February	1st to 10th	Night	16% 8% 2 4 4 2 4 3 4 5% 47%	2340
	11th to 20th	Night	21% 6% 2 5% 5% 2 3 3 4 5% 44%	2150
	21st to end	Night	21% 7% 3 5% 4 3 3 3 3 5% 44%	1628
March	1st to 10th	Night	16% 6% 2 4 5% 3 4 3 4 7% 45%	1980
	11th to 20th	Night	16% 6% 3 5% 5% 3 5% 4 5% 6% 42%	1980
	21st to end	Night	13% 6% 2 5% 4 3 3 4 5% 6% 48%	2178
April	1st to 10th	Night	10% 4 2 4 4 3 5% 5% 5% 7% 51%	1890
	11th to 20th	Night	10% 6% 3 5% 6% 2 4 4 5% 8% 48%	1775
	21st to end	Night	10% 5% 2 4 4 3 3 4 4 9% 52%	1800
May	1st to 10th	Night	9% 5% 3 5% 5% 3 4 4 5% 9% 48%	1800
	11th to 20th	Night	10% 5% 2 5% 4 3 3 4 5% 8% 50%	1603
	21st to end	Night	7% 4 3 5% 4 3 5% 4 6% 9% 49%	1745
June	1st to 10th	Night	4 4 2 4 4 2 5% 5% 6% 12% 52%	1620
	11th to 20th	Night	4 2 2 3 4 3 5% 5% 5% 11% 56%	1620
	21st to end	Night	5% 3 2 4 4 3 4 5% 7% 9% 53%	1620
July	1st to 10th	Night	5% 4 2 4 5% 3 5% 6% 7% 12% 46%	1620
	11th to 20th	Night	3 2 1 3 3 1 6% 6% 5% 12% 57%	1620
	21st to end	Night	3 2 2 4 5% 3 5% 5% 7% 12% 52%	1772
August	1st to 10th	Night	3 2 1 2 3 2 3 5% 6% 12% 61%	1611
	11th to 20th	Night	5% 4 1 4 4 3 4 6% 7% 11% 51%	1737
	21st to end	Night	7% 4 2 5% 6% 4 6% 6% 7% 8% 47%	1980
September	1st to 10th	Night	7% 4 2 5% 5% 3 4 4 5% 8% 54%	1800
	11th to 20th	Night	10% 4 2 4 5% 3 4 5% 6% 7% 49%	1938
	21st to end	Night	8% 3 1 3 4 3 4 4 5% 7% 59%	1998
October	1st to 10th	Night	7% 3 2 3 3 2 3 4 5% 7% 61%	2160
	11th to 20th	Night	11% 4 2 4 4 2 3 3 4 5% 59%	2160
	21st to end	Night	15% 4 1 3 4 2 3 3 3 4 57%	2376
November	1st to 10th	Night	11% 4 2 4 3 2 3 3 4 5% 59%	2220
	11th to 20th	Night	10% 5% 3 4 4 2 4 4 4 5% 54%	2280
	21st to end	Night	15% 6% 2 6% 4 2 3 3 5% 5% 49%	2308
December	1st to 10th	Night	17% 6% 2 4 4 2 3 4 5% 6% 46%	2470
	11th to 20th	Night	15% 7% 3 5% 5% 3 4 4 4 3 48%	3036
	21st to end	Night	16% 8% 3 4 4 2 3 3 4 5% 48%	4532

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% 3 7% 18% 23% 7%	1708
	11th to 20th	Day	43% 3 6% 19% 21% 7%	1638
	21st to end	Day	41% 3 5% 17% 25% 9%	1782
February	1st to 10th	Day	49% 4 6% 15% 16% 9%	1620
	11th to 20th	Day	49% 4 6% 16% 19% 7%	1718
	21st to end	Day	50% 4 7% 9% 21% 10%	1628
March	1st to 10th	Day	47% 5% 7% 15% 17% 9%	1980
	11th to 20th	Day	46% 5% 7% 18% 19% 5%	1980
	21st to end	Day	42% 5% 9% 17% 24% 3	2178
April	1st to 10th	Day	41% 5% 7% 21% 17% 8%	2070
	11th to 20th	Day	43% 6% 8% 17% 19% 7%	2134
	21st to end	Day	38% 6% 8% 20% 23% 4	2160
May	1st to 10th	Day	40% 6% 10% 21% 18% 6%	2160
	11th to 20th	Day	40% 7% 11% 24% 15% 3	2292
	21st to end	Day	38% 9% 14% 24% 14% 1	2531
June	1st to 10th	Day	36% 10% 14% 25% 14% 1	2340
	11th to 20th	Day	32% 9% 16% 25% 16% 3	2340
	21st to end	Day	31% 10% 15% 25% 16% 3	2340
July	1st to 10th	Day	37% 12% 19% 22% 9% 1	2276
	11th to 20th	Day	30% 11% 20% 25% 13% 1	2271
	21st to end	Day	33% 11% 20% 25% 11%	2405
August	1st to 10th	Day	27% 9% 19% 30% 14% 1	2314
	11th to 20th	Day	33% 10% 17% 24% 16% 2	2160
	21st to end	Day	36% 11% 16% 20% 14% 2	2376
September	1st to 10th	Day	33% 8% 14% 19% 18% 8%	2160
	11th to 20th	Day	39% 8% 12% 16% 18% 7%	2016
	21st to end	Day	29% 5% 10% 22% 24% 10%	1944
October	1st to 10th	Day	25% 5% 11% 22% 23% 14%	1800
	11th to 20th	Day	32% 4 7% 18% 25% 14%	1800
	21st to end	Day	35% 4 5% 16% 28% 12%	1980
November	1st to 10th	Day	32% 6% 9% 18% 24% 10%	1858
	11th to 20th	Day	34% 5% 6% 17% 27% 11%	1900
	21st to end	Day	43% 4 5% 17% 23% 7%	1867
December	1st to 10th	Day	41% 5% 9% 19% 19% 8%	1710
	11th to 20th	Day	44% 4 6% 14% 24% 7%	2159
	21st to end	Day	45% 4 6% 15% 25% 5%	3135
January	1st to 10th	Night	38% 4 5% 16% 27% 9%	2458
	11th to 20th	Night	42% 5% 7% 17% 21% 8%	2367
	21st to end	Night	41% 4 4 14% 26% 12%	2574
February	1st to 10th	Night	40% 4 7% 18% 20% 11%	2340
	11th to 20th	Night	44% 3 7% 16% 21% 8%	2151
	21st to end	Night	46% 3 7% 13% 17% 14%	1628
March	1st to 10th	Night	41% 5% 8% 15% 22% 11%	1980
	11th to 20th	Night	42% 6% 9% 15% 20% 8%	1980
	21st to end	Night	36% 6% 10% 17% 25% 6%	2178
April	1st to 10th	Night	32% 6% 12% 22% 17% 11%	1890
	11th to 20th	Night	35% 6% 10% 18% 19% 12%	1775
	21st to end	Night	32% 4 10% 23% 26% 4	1800
May	1st to 10th	Night	34% 7% 11% 21% 18% 9%	1800
	11th to 20th	Night	32% 6% 12% 26% 19% 4	1604
	21st to end	Night	31% 7% 15% 27% 19% 1	1746
June	1st to 10th	Night	25% 10% 16% 28% 20% 2	1620
	11th to 20th	Night	23% 7% 17% 30% 20% 4	1620
	21st to end	Night	26% 7% 16% 22% 24% 4	1620
July	1st to 10th	Night	29% 11% 23% 27% 9% 2	1575
	11th to 20th	Night	18% 10% 24% 29% 17% 3	1566
	21st to end	Night	22% 9% 27% 27% 14% 1	1673
August	1st to 10th	Night	16% 7% 22% 35% 18% 2	1601
	11th to 20th	Night	25% 9% 17% 29% 17% 4	1737
	21st to end	Night	32% 9% 16% 23% 16% 3	1980
September	1st to 10th	Night	29% 7% 15% 20% 19% 10%	1800
	11th to 20th	Night	33% 7% 12% 19% 19% 10%	1938
	21st to end	Night	26% 5% 11% 20% 27% 12%	1998
October	1st to 10th	Night	24% 5% 8% 23% 24% 16%	2160
	11th to 20th	Night	29% 4 7% 14% 29% 18%	2160
	21st to end	Night	32% 4 7% 15% 26% 16%	2376
November	1st to 10th	Night	29% 4 9% 17% 28% 13%	2220
	11th to 20th	Night	32% 4 8% 16% 25% 14%	2280
	21st to end	Night	38% 4 6% 18% 24% 10%	2308
December	1st to 10th	Night	38% 6% 10% 18% 20% 8%	2470
	11th to 20th	Night	41% 4 6% 13% 24% 11%	3037
	21st to end	Night	40% 3 7% 17% 26% 7%	4532

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	19% 13% 39% 19% 10%	270
	11th to 20th	Day	26% 11% 33% 22% 7% 1	246
	21st to end	Day	19% 15% 39% 21% 5%	264
February	1st to 10th	Day	27% 10% 33% 24% 6% 1	240
	11th to 20th	Day	31% 15% 36% 16% 3	240
	21st to end	Day	33% 17% 35% 13% 2 1	198
March	1st to 10th	Day	24% 15% 35% 20% 6%	240
	11th to 20th	Day	20% 19% 32% 23% 5% 1	240
	21st to end	Day	16% 19% 36% 22% 7% 1	264
April	1st to 10th	Day	16% 12% 37% 25% 9% 1	330
	11th to 20th	Day	18% 13% 29% 25% 15% 1	412
	21st to end	Day	15% 9% 30% 32% 13% 2	420
May	1st to 10th	Day	15% 7% 28% 35% 14% 1	423
	11th to 20th	Day	14% 4 21% 34% 21% 5%	611
	21st to end	Day	10% 5% 18% 34% 27% 7%	679
June	1st to 10th	Day	7% 2 9% 31% 38% 13%	630
	11th to 20th	Day	4 1 12% 30% 41% 12%	630
	21st to end	Day	6% 1 9% 27% 37% 19%	630
July	1st to 10th	Day	8% 1 7% 24% 39% 21%	621
	11th to 20th	Day	5% 1 6% 21% 41% 27%	618
	21st to end	Day	6% 5% 24% 44% 21%	684
August	1st to 10th	Day	5% 5% 18% 48% 23%	626
	11th to 20th	Day	8% 1 4 17% 48% 22%	474
	21st to end	Day	12% 2 4 15% 36% 31%	495
September	1st to 10th	Day	8% 5% 17% 40% 29%	450
	11th to 20th	Day	10% 1 6% 25% 34% 25%	306
	21st to end	Day	9% 2 5% 30% 36% 18%	270
October	1st to 10th	Day	7% 2 16% 31% 31% 14%	270
	11th to 20th	Day	10% 6% 25% 32% 18% 8%	270
	21st to end	Day	24% 9% 27% 22% 12% 6%	297
November	1st to 10th	Day	13% 4 28% 29% 23% 4	270
	11th to 20th	Day	13% 9% 31% 30% 14% 2	270
	21st to end	Day	19% 12% 30% 22% 14% 1	270
December	1st to 10th	Day	16% 10% 39% 23% 10% 3	270
	11th to 20th	Day	21% 11% 32% 26% 8% 1	270
	21st to end	Day	18% 15% 39% 20% 6% 2	297
January	1st to 10th	Night	21% 7% 32% 33% 7%	950
	11th to 20th	Night	22% 9% 31% 29% 8% 1	911
	21st to end	Night	21% 7% 34% 32% 5%	990
February	1st to 10th	Night	20% 9% 33% 32% 6%	900
	11th to 20th	Night	25% 7% 34% 29% 5%	756
	21st to end	Night	25% 11% 36% 25% 3	444
March	1st to 10th	Night	19% 7% 32% 36% 6%	540
	11th to 20th	Night	17% 9% 33% 34% 7% 1	540
	21st to end	Night	15% 6% 36% 35% 7%	594
April	1st to 10th	Night	12% 8% 38% 34% 9%	540
	11th to 20th	Night	12% 9% 34% 32% 12% 1	533
	21st to end	Night	12% 7% 35% 32% 12% 1	540
May	1st to 10th	Night	10% 5% 32% 38% 14% 1	540
	11th to 20th	Night	12% 4 22% 41% 20% 2	531
	21st to end	Night	7% 2 17% 42% 28% 4	584
June	1st to 10th	Night	4 1 9% 42% 40% 4	540
	11th to 20th	Night	3 2 8% 41% 43% 3	540
	21st to end	Night	5% 1 9% 33% 44% 7%	540
July	1st to 10th	Night	4 1 3 32% 50% 10%	525
	11th to 20th	Night	3 1 4 29% 53% 10%	522
	21st to end	Night	3 5% 28% 52% 11%	591
August	1st to 10th	Night	3 1 4 25% 57% 11%	537
	11th to 20th	Night	5% 1 4 28% 55% 8%	534
	21st to end	Night	7% 2 4 26% 50% 11%	594
September	1st to 10th	Night	7% 5% 30% 49% 9%	540
	11th to 20th	Night	11% 1 6% 29% 46% 7%	540
	21st to end	Night	9% 2 8% 35% 41% 5%	558
October	1st to 10th	Night	8% 1 10% 39% 37% 5%	720
	11th to 20th	Night	13% 3 19% 39% 23% 2	720
	21st to end	Night	16% 5% 23% 36% 19% 3	792
November	1st to 10th	Night	12% 3 21% 40% 22% 2	740
	11th to 20th	Night	11% 7% 25% 41% 16% 1	760
	21st to end	Night	17% 8% 28% 31% 14% 1	788
December	1st to 10th	Night	17% 7% 28% 37% 10%	950
	11th to 20th	Night	21% 7% 29% 35% 8%	950
	21st to end	Night	20% 7% 32% 31% 9%	1045

Page generated at 2024-01-10 00:25:05. Version ac07

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