Lake Charles
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lake Charles clear sky chart from 2005-11-06 to 2024-01-12.

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 6% 6% 4 6% 6% 6% 8% 39%	75023
	Night	12% 6% 2 5% 4 3 4 4 5% 8% 46%	74706
Transparency	Day	42% 5% 12% 19% 16% 6%	74748
	Night	36% 4 13% 21% 18% 8%	74502
Seeing	Day	13% 6% 19% 26% 24% 12%	13757
	Night	14% 4 20% 31% 25% 5%	23652

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	20% 6% 3 4 4 3 5% 4 5% 6% 41%	1707
	11th to 20th	Day	15% 7% 3 5% 5% 3 4 3 4 7% 45%	1629
	21st to end	Day	20% 7% 3 5% 4 2 4 3 4 5% 42%	1782
February	1st to 10th	Day	19% 7% 3 7% 6% 3 4 3 6% 6% 36%	1628
	11th to 20th	Day	20% 9% 4 6% 5% 3 4 3 3 6% 37%	1810
	21st to end	Day	21% 10% 4 5% 6% 2 4 4 5% 5% 35%	1628
March	1st to 10th	Day	19% 7% 3 6% 5% 3 4 4 5% 7% 38%	1980
	11th to 20th	Day	15% 8% 3 7% 5% 3 5% 5% 5% 8% 36%	1980
	21st to end	Day	12% 7% 3 5% 5% 3 4 5% 6% 7% 44%	2178
April	1st to 10th	Day	11% 6% 4 6% 7% 4 5% 5% 5% 7% 40%	2078
	11th to 20th	Day	16% 6% 3 6% 6% 3 4 4 6% 9% 37%	2134
	21st to end	Day	10% 6% 2 5% 5% 3 6% 4 6% 9% 44%	2160
May	1st to 10th	Day	10% 6% 3 6% 5% 4 5% 6% 6% 9% 41%	2160
	11th to 20th	Day	9% 6% 2 5% 5% 3 5% 7% 5% 10% 44%	2124
	21st to end	Day	7% 5% 3 5% 8% 5% 8% 7% 7% 11% 34%	2519
June	1st to 10th	Day	7% 5% 3 7% 6% 4 7% 6% 8% 10% 36%	2340
	11th to 20th	Day	4 5% 3 6% 7% 5% 8% 8% 8% 11% 36%	2340
	21st to end	Day	8% 6% 3 7% 7% 5% 9% 9% 10% 13% 24%	2340
July	1st to 10th	Day	9% 5% 3 7% 8% 5% 8% 8% 9% 12% 27%	2340
	11th to 20th	Day	7% 5% 2 7% 8% 4 7% 8% 9% 12% 31%	2340
	21st to end	Day	8% 5% 2 5% 8% 4 9% 7% 9% 12% 29%	2546
August	1st to 10th	Day	5% 2 2 6% 7% 5% 8% 9% 10% 13% 34%	2254
	11th to 20th	Day	6% 5% 3 6% 7% 5% 8% 9% 8% 11% 33%	2125
	21st to end	Day	10% 5% 2 6% 7% 5% 7% 9% 8% 10% 30%	2376
September	1st to 10th	Day	9% 4 2 7% 7% 5% 7% 7% 6% 10% 36%	2160
	11th to 20th	Day	15% 6% 2 6% 7% 4 6% 6% 6% 7% 35%	2058
	21st to end	Day	11% 5% 3 5% 6% 4 4 4 5% 8% 43%	1921
October	1st to 10th	Day	7% 3 2 5% 4 3 5% 4 5% 6% 56%	1800
	11th to 20th	Day	10% 5% 2 4 5% 2 4 4 6% 7% 51%	1800
	21st to end	Day	11% 5% 2 4 3 2 4 4 5% 6% 53%	1980
November	1st to 10th	Day	11% 5% 2 4 5% 3 5% 5% 5% 6% 48%	1858
	11th to 20th	Day	11% 7% 3 5% 4 2 4 4 4 6% 51%	1900
	21st to end	Day	15% 7% 2 5% 4 2 5% 5% 4 5% 45%	1900
December	1st to 10th	Day	15% 6% 3 6% 5% 3 4 5% 4 8% 42%	1852
	11th to 20th	Day	15% 7% 3 6% 6% 4 5% 6% 4 6% 39%	2161
	21st to end	Day	17% 6% 3 6% 5% 3 4 4 5% 7% 41%	3135
January	1st to 10th	Night	17% 6% 3 5% 4 3 3 4 4 7% 43%	2458
	11th to 20th	Night	18% 7% 2 4 4 3 4 4 4 5% 46%	2360
	21st to end	Night	19% 7% 3 5% 6% 3 4 3 4 6% 42%	2574
February	1st to 10th	Night	18% 8% 3 6% 5% 3 4 4 3 5% 41%	2330
	11th to 20th	Night	20% 7% 3 5% 4 2 3 3 4 6% 42%	2050
	21st to end	Night	22% 9% 3 6% 4 2 4 3 6% 6% 36%	1628
March	1st to 10th	Night	17% 6% 3 6% 4 3 3 4 5% 6% 42%	1980
	11th to 20th	Night	15% 8% 3 5% 5% 3 4 5% 5% 8% 39%	1980
	21st to end	Night	15% 5% 2 4 4 2 4 4 5% 7% 48%	2178
April	1st to 10th	Night	14% 5% 3 5% 5% 3 5% 5% 6% 9% 41%	1879
	11th to 20th	Night	14% 6% 2 4 3 2 4 4 5% 8% 48%	1775
	21st to end	Night	9% 4 2 5% 5% 3 5% 4 5% 8% 48%	1800
May	1st to 10th	Night	12% 5% 2 5% 5% 2 5% 5% 6% 9% 44%	1800
	11th to 20th	Night	7% 6% 2 4 3 3 4 5% 6% 8% 51%	1769
	21st to end	Night	6% 4 2 5% 4 3 4 6% 7% 10% 48%	1752
June	1st to 10th	Night	5% 3 2 5% 5% 2 4 5% 6% 12% 51%	1620
	11th to 20th	Night	3 4 2 5% 4 3 4 5% 7% 13% 51%	1620
	21st to end	Night	6% 5% 2 4 5% 3 6% 7% 8% 12% 42%	1620
July	1st to 10th	Night	5% 4 3 6% 5% 2 6% 7% 8% 12% 42%	1620
	11th to 20th	Night	4 4 2 4 4 2 4 5% 7% 13% 51%	1620
	21st to end	Night	4 4 2 4 4 4 5% 6% 7% 13% 47%	1772
August	1st to 10th	Night	3 2 1 2 3 3 4 6% 9% 12% 55%	1682
	11th to 20th	Night	4 3 2 5% 5% 3 5% 7% 8% 13% 46%	1776
	21st to end	Night	9% 4 3 5% 5% 4 6% 7% 7% 10% 41%	1980
September	1st to 10th	Night	7% 4 2 4 4 3 4 5% 7% 13% 47%	1800
	11th to 20th	Night	11% 6% 3 6% 6% 4 5% 5% 6% 9% 40%	1896
	21st to end	Night	9% 4 2 4 4 2 4 4 5% 7% 55%	2020
October	1st to 10th	Night	5% 3 2 4 4 3 5% 5% 5% 8% 57%	2160
	11th to 20th	Night	9% 4 2 4 4 3 3 4 5% 7% 56%	2160
	21st to end	Night	11% 5% 2 4 2 1 3 3 4 5% 58%	2376
November	1st to 10th	Night	8% 5% 2 4 4 3 4 4 6% 6% 55%	2220
	11th to 20th	Night	11% 5% 2 4 3 2 3 3 5% 6% 56%	2280
	21st to end	Night	14% 7% 3 6% 4 2 4 3 4 6% 46%	2280
December	1st to 10th	Night	17% 6% 3 5% 5% 2 4 3 5% 7% 42%	2323
	11th to 20th	Night	14% 9% 4 6% 5% 2 4 3 4 7% 43%	3036
	21st to end	Night	18% 9% 3 5% 5% 3 4 4 4 5% 41%	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	45% 2 6% 19% 19% 8%	1708
	11th to 20th	Day	41% 3 6% 18% 23% 9%	1629
	21st to end	Day	46% 2 5% 17% 18% 11%	1782
February	1st to 10th	Day	49% 3 7% 15% 16% 9%	1628
	11th to 20th	Day	50% 2 7% 15% 16% 9%	1820
	21st to end	Day	52% 3 7% 15% 16% 7%	1628
March	1st to 10th	Day	46% 3 8% 19% 17% 6%	1980
	11th to 20th	Day	46% 3 10% 13% 21% 7%	1980
	21st to end	Day	39% 3 12% 19% 22% 5%	2178
April	1st to 10th	Day	42% 4 10% 20% 17% 8%	2078
	11th to 20th	Day	44% 3 10% 18% 16% 9%	2134
	21st to end	Day	36% 4 13% 20% 22% 5%	2160
May	1st to 10th	Day	39% 4 13% 21% 18% 6%	2160
	11th to 20th	Day	35% 4 13% 28% 16% 3	2128
	21st to end	Day	41% 6% 15% 23% 14% 1	2519
June	1st to 10th	Day	40% 6% 17% 23% 14% 1	2340
	11th to 20th	Day	39% 7% 15% 25% 13% 1	2340
	21st to end	Day	45% 8% 20% 20% 7%	2340
July	1st to 10th	Day	43% 8% 23% 22% 4	2276
	11th to 20th	Day	43% 8% 24% 20% 4	2271
	21st to end	Day	43% 8% 24% 20% 4 1	2405
August	1st to 10th	Day	36% 8% 24% 24% 8%	2240
	11th to 20th	Day	40% 9% 22% 22% 5% 1	2125
	21st to end	Day	46% 9% 19% 17% 8% 2	2376
September	1st to 10th	Day	43% 7% 15% 19% 12% 4	2160
	11th to 20th	Day	47% 6% 12% 17% 13% 5%	2058
	21st to end	Day	40% 4 10% 22% 16% 8%	1921
October	1st to 10th	Day	31% 4 8% 21% 24% 13%	1800
	11th to 20th	Day	33% 3 7% 18% 26% 13%	1800
	21st to end	Day	32% 2 7% 16% 27% 16%	1980
November	1st to 10th	Day	35% 3 9% 19% 23% 11%	1858
	11th to 20th	Day	34% 3 6% 19% 27% 11%	1900
	21st to end	Day	42% 3 7% 18% 21% 8%	1900
December	1st to 10th	Day	42% 3 10% 22% 15% 8%	1852
	11th to 20th	Day	46% 3 6% 16% 19% 10%	2159
	21st to end	Day	45% 2 6% 16% 25% 6%	3135
January	1st to 10th	Night	42% 3 5% 16% 23% 10%	2458
	11th to 20th	Night	41% 3 5% 18% 21% 12%	2360
	21st to end	Night	46% 2 5% 16% 19% 12%	2574
February	1st to 10th	Night	47% 2 7% 14% 20% 11%	2330
	11th to 20th	Night	45% 3 6% 19% 18% 10%	2051
	21st to end	Night	50% 3 8% 13% 14% 12%	1628
March	1st to 10th	Night	41% 3 11% 17% 17% 10%	1980
	11th to 20th	Night	43% 4 12% 14% 21% 6%	1980
	21st to end	Night	35% 4 11% 21% 22% 7%	2178
April	1st to 10th	Night	41% 4 10% 20% 16% 9%	1879
	11th to 20th	Night	36% 3 13% 21% 15% 12%	1775
	21st to end	Night	35% 3 11% 22% 22% 7%	1800
May	1st to 10th	Night	36% 5% 13% 20% 17% 8%	1800
	11th to 20th	Night	30% 4 14% 27% 23% 2	1770
	21st to end	Night	29% 6% 18% 30% 16% 1	1753
June	1st to 10th	Night	27% 5% 21% 30% 15% 1	1620
	11th to 20th	Night	25% 8% 20% 32% 15% 1	1620
	21st to end	Night	33% 8% 27% 23% 9%	1620
July	1st to 10th	Night	32% 8% 29% 24% 6%	1575
	11th to 20th	Night	25% 8% 38% 23% 6%	1566
	21st to end	Night	26% 9% 34% 24% 7%	1673
August	1st to 10th	Night	19% 8% 32% 34% 7%	1672
	11th to 20th	Night	28% 9% 29% 26% 7% 1	1776
	21st to end	Night	35% 10% 23% 20% 9% 2	1980
September	1st to 10th	Night	30% 8% 23% 22% 13% 4	1800
	11th to 20th	Night	40% 5% 18% 18% 13% 5%	1896
	21st to end	Night	30% 5% 13% 24% 18% 10%	2020
October	1st to 10th	Night	27% 3 11% 23% 22% 14%	2160
	11th to 20th	Night	28% 4 6% 24% 23% 15%	2160
	21st to end	Night	29% 2 7% 17% 26% 19%	2376
November	1st to 10th	Night	30% 3 9% 22% 25% 12%	2220
	11th to 20th	Night	32% 2 8% 20% 26% 13%	2280
	21st to end	Night	40% 2 6% 21% 20% 10%	2280
December	1st to 10th	Night	44% 2 8% 22% 16% 9%	2323
	11th to 20th	Night	43% 2 6% 13% 22% 14%	3037
	21st to end	Night	47% 2 6% 15% 22% 8%	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	28% 10% 38% 15% 8% 1	270
	11th to 20th	Day	18% 12% 35% 23% 11% 1	243
	21st to end	Day	23% 14% 37% 21% 5%	264
February	1st to 10th	Day	21% 15% 35% 22% 6%	240
	11th to 20th	Day	31% 15% 28% 22% 4	240
	21st to end	Day	23% 19% 39% 15% 4	198
March	1st to 10th	Day	26% 14% 35% 19% 6%	240
	11th to 20th	Day	18% 16% 43% 15% 6% 1	240
	21st to end	Day	16% 20% 35% 22% 6% 1	264
April	1st to 10th	Day	14% 13% 33% 30% 10%	338
	11th to 20th	Day	24% 10% 26% 25% 15% 1	412
	21st to end	Day	14% 6% 32% 29% 16% 1	420
May	1st to 10th	Day	14% 9% 22% 36% 15% 3	423
	11th to 20th	Day	12% 4 17% 37% 24% 6%	447
	21st to end	Day	6% 4 21% 36% 24% 8%	667
June	1st to 10th	Day	7% 2 12% 36% 29% 15%	630
	11th to 20th	Day	6% 1 15% 33% 32% 13%	630
	21st to end	Day	11% 2 10% 26% 32% 19%	630
July	1st to 10th	Day	7% 2 6% 27% 37% 21%	621
	11th to 20th	Day	6% 2 5% 22% 39% 26%	618
	21st to end	Day	7% 2 4 25% 38% 24%	684
August	1st to 10th	Day	4 1 2 19% 42% 31%	552
	11th to 20th	Day	5% 2 3 11% 44% 35%	439
	21st to end	Day	11% 2 6% 17% 35% 29%	495
September	1st to 10th	Day	7% 2 4 18% 42% 26%	450
	11th to 20th	Day	14% 2 4 24% 39% 16%	348
	21st to end	Day	12% 1 10% 28% 38% 12%	270
October	1st to 10th	Day	9% 1 16% 37% 29% 9%	270
	11th to 20th	Day	10% 3 17% 36% 20% 14%	270
	21st to end	Day	15% 9% 22% 33% 15% 6%	297
November	1st to 10th	Day	13% 6% 23% 29% 24% 6%	270
	11th to 20th	Day	16% 8% 31% 31% 12% 2	270
	21st to end	Day	20% 13% 29% 24% 12% 2	270
December	1st to 10th	Day	19% 6% 33% 25% 13% 4	270
	11th to 20th	Day	17% 13% 40% 23% 6% 1	270
	21st to end	Day	20% 11% 40% 21% 6% 2	297
January	1st to 10th	Night	22% 7% 32% 31% 9%	950
	11th to 20th	Night	21% 7% 30% 34% 8% 1	908
	21st to end	Night	22% 7% 32% 32% 7%	990
February	1st to 10th	Night	23% 8% 32% 32% 5%	890
	11th to 20th	Night	22% 10% 30% 31% 7%	655
	21st to end	Night	24% 11% 33% 28% 4	444
March	1st to 10th	Night	19% 6% 31% 35% 10%	540
	11th to 20th	Night	19% 6% 31% 33% 11%	540
	21st to end	Night	18% 5% 29% 36% 12%	594
April	1st to 10th	Night	17% 5% 31% 35% 11% 1	540
	11th to 20th	Night	16% 8% 28% 32% 16%	533
	21st to end	Night	11% 3 30% 40% 15% 1	540
May	1st to 10th	Night	14% 5% 23% 43% 15% 1	540
	11th to 20th	Night	9% 2 24% 40% 23% 2	531
	21st to end	Night	6% 2 11% 40% 36% 4	584
June	1st to 10th	Night	6% 1 5% 32% 48% 8%	540
	11th to 20th	Night	4 1 5% 34% 49% 8%	540
	21st to end	Night	9% 1 5% 22% 49% 14%	540
July	1st to 10th	Night	5% 2 2 18% 55% 19%	525
	11th to 20th	Night	4 1 2 14% 54% 24%	522
	21st to end	Night	5% 2 18% 54% 20%	591
August	1st to 10th	Night	4 1 1 12% 61% 21%	537
	11th to 20th	Night	5% 1 1 13% 57% 22%	534
	21st to end	Night	9% 1 4 17% 49% 20%	594
September	1st to 10th	Night	9% 1 3 18% 52% 18%	540
	11th to 20th	Night	12% 2 5% 22% 50% 10%	540
	21st to end	Night	9% 1 6% 31% 45% 7%	580
October	1st to 10th	Night	7% 2 8% 37% 39% 7%	720
	11th to 20th	Night	10% 2 18% 39% 27% 5%	720
	21st to end	Night	13% 5% 17% 38% 24% 3	792
November	1st to 10th	Night	10% 3 18% 43% 24% 3	740
	11th to 20th	Night	14% 5% 21% 40% 18% 1	760
	21st to end	Night	17% 6% 27% 33% 15% 1	760
December	1st to 10th	Night	20% 6% 24% 34% 16%	803
	11th to 20th	Night	21% 6% 30% 34% 9% 1	950
	21st to end	Night	22% 8% 29% 32% 9%	1045

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