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 2024-11-05.

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% 7% 3 7% 5% 5% 5% 4 6% 8% 37%	100841
	Night	12% 7% 2 6% 4 4 4 4 6% 8% 44%	98242
Transparency	Day	42% 5% 12% 19% 16% 6%	104487
	Night	37% 4 13% 20% 18% 8%	102737
Seeing	Day	13% 6% 19% 26% 24% 12%	14891
	Night	14% 5% 20% 31% 25% 5%	24653

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% 8% 3 6% 3 4 4 3 5% 6% 38%	2847
	11th to 20th	Day	15% 6% 2 4 3 3 2 1 3 5% 54%	2850
	21st to end	Day	23% 9% 3 7% 4 4 4 3 5% 6% 34%	3135
February	1st to 10th	Day	19% 8% 3 8% 4 4 3 3 6% 6% 36%	1718
	11th to 20th	Day	20% 10% 3 7% 4 4 3 3 3 5% 38%	1913
	21st to end	Day	21% 10% 3 6% 4 3 4 3 5% 5% 36%	1727
March	1st to 10th	Day	22% 10% 3 8% 5% 5% 5% 4 5% 7% 26%	3436
	11th to 20th	Day	17% 8% 3 8% 5% 5% 5% 5% 6% 9% 28%	3480
	21st to end	Day	15% 7% 3 7% 5% 4 4 3 5% 6% 41%	3814
April	1st to 10th	Day	12% 7% 3 7% 6% 5% 5% 3 5% 7% 39%	2194
	11th to 20th	Day	16% 7% 2 6% 5% 4 4 3 7% 8% 37%	2254
	21st to end	Day	10% 7% 2 5% 5% 5% 5% 4 6% 8% 44%	2280
May	1st to 10th	Day	14% 9% 3 9% 6% 6% 5% 5% 6% 7% 29%	3765
	11th to 20th	Day	12% 6% 2 6% 4 4 4 4 5% 8% 44%	3764
	21st to end	Day	6% 5% 2 7% 6% 7% 7% 5% 8% 11% 35%	4465
June	1st to 10th	Day	7% 6% 2 8% 5% 6% 7% 5% 8% 10% 35%	2470
	11th to 20th	Day	4 6% 2 7% 6% 7% 7% 6% 9% 10% 36%	2470
	21st to end	Day	7% 6% 3 8% 7% 7% 9% 7% 10% 12% 25%	2470
July	1st to 10th	Day	7% 6% 3 9% 7% 7% 9% 7% 11% 12% 24%	4120
	11th to 20th	Day	6% 8% 3 12% 9% 8% 9% 6% 8% 10% 21%	4120
	21st to end	Day	13% 9% 3 9% 7% 6% 7% 5% 8% 10% 23%	4465
August	1st to 10th	Day	3 2 1 4 4 5% 6% 5% 7% 10% 54%	3960
	11th to 20th	Day	3 3 2 5% 5% 6% 7% 6% 9% 12% 42%	3729
	21st to end	Day	11% 7% 3 7% 6% 7% 6% 5% 7% 8% 33%	4180
September	1st to 10th	Day	10% 5% 2 8% 6% 6% 7% 5% 6% 10% 35%	2280
	11th to 20th	Day	14% 6% 2 7% 6% 5% 5% 5% 6% 7% 35%	2172
	21st to end	Day	10% 5% 2 6% 6% 5% 5% 3 5% 8% 44%	2027
October	1st to 10th	Day	7% 4 2 5% 4 4 4 3 4 5% 57%	1900
	11th to 20th	Day	10% 5% 1 5% 4 4 3 3 6% 7% 52%	1900
	21st to end	Day	11% 5% 2 4 3 3 4 4 5% 6% 53%	2090
November	1st to 10th	Day	11% 5% 2 5% 5% 4 5% 4 5% 6% 47%	1898
	11th to 20th	Day	11% 7% 3 5% 3 3 3 3 4 6% 51%	1900
	21st to end	Day	15% 8% 2 6% 3 3 5% 4 4 5% 45%	1900
December	1st to 10th	Day	15% 6% 3 6% 5% 4 4 4 4 8% 41%	1852
	11th to 20th	Day	15% 8% 3 7% 5% 5% 4 5% 4 6% 38%	2161
	21st to end	Day	17% 7% 2 6% 4 4 4 3 6% 7% 40%	3135
January	1st to 10th	Night	16% 7% 5% 6% 3 3 3 3 5% 6% 43%	4108
	11th to 20th	Night	15% 8% 2 5% 4 3 3 2 3 5% 50%	4120
	21st to end	Night	24% 8% 3 6% 4 3 3 3 4 7% 35%	4532
February	1st to 10th	Night	17% 8% 3 7% 4 4 4 3 3 5% 40%	2460
	11th to 20th	Night	19% 8% 3 6% 3 3 3 3 4 6% 42%	2168
	21st to end	Night	21% 10% 3 6% 4 3 3 2 6% 6% 37%	1727
March	1st to 10th	Night	23% 12% 4 8% 4 4 3 3 5% 5% 30%	3419
	11th to 20th	Night	21% 9% 3 7% 5% 4 4 4 5% 7% 32%	3480
	21st to end	Night	14% 6% 2 5% 4 4 5% 4 6% 7% 44%	3817
April	1st to 10th	Night	14% 6% 3 6% 4 4 5% 3 6% 8% 40%	1983
	11th to 20th	Night	15% 6% 1 5% 3 3 4 3 5% 8% 47%	1875
	21st to end	Night	9% 5% 2 6% 5% 5% 5% 3 5% 8% 48%	1900
May	1st to 10th	Night	21% 9% 3 7% 5% 4 5% 4 6% 8% 29%	3130
	11th to 20th	Night	13% 7% 3 6% 4 5% 4 3 5% 7% 44%	3129
	21st to end	Night	10% 7% 2 7% 4 5% 4 5% 8% 10% 38%	3097
June	1st to 10th	Night	5% 4 2 5% 4 4 3 4 7% 12% 51%	1710
	11th to 20th	Night	4 4 1 5% 4 4 4 4 7% 12% 50%	1710
	21st to end	Night	5% 5% 1 5% 5% 5% 6% 5% 9% 12% 42%	1710
July	1st to 10th	Night	4 5% 3 8% 5% 5% 6% 5% 8% 13% 38%	2850
	11th to 20th	Night	3 5% 2 7% 6% 5% 6% 5% 9% 12% 40%	2850
	21st to end	Night	7% 8% 3 8% 5% 5% 5% 5% 7% 11% 36%	3098
August	1st to 10th	Night	2 2 1 2 2 3 4 4 7% 10% 64%	2959
	11th to 20th	Night	2 2 1 3 3 3 3 4 6% 13% 60%	3100
	21st to end	Night	8% 5% 2 6% 5% 6% 6% 6% 6% 9% 41%	3476
September	1st to 10th	Night	8% 5% 2 5% 4 3 5% 4 7% 12% 45%	1900
	11th to 20th	Night	11% 6% 2 7% 5% 5% 4 3 6% 9% 40%	2002
	21st to end	Night	8% 4 2 5% 3 3 4 4 5% 7% 55%	2133
October	1st to 10th	Night	5% 4 2 4 4 4 4 4 5% 8% 57%	2280
	11th to 20th	Night	9% 4 2 4 3 4 3 3 4 6% 58%	2280
	21st to end	Night	10% 5% 2 4 2 2 3 3 5% 5% 58%	2508
November	1st to 10th	Night	9% 5% 2 5% 4 4 3 3 6% 6% 53%	2280
	11th to 20th	Night	11% 6% 2 5% 3 3 3 2 4 6% 55%	2280
	21st to end	Night	14% 8% 2 7% 4 4 3 3 4 6% 45%	2280
December	1st to 10th	Night	17% 7% 2 6% 5% 4 4 2 5% 6% 42%	2323
	11th to 20th	Night	14% 9% 3 7% 4 4 3 2 4 6% 43%	3036
	21st to end	Night	18% 9% 3 6% 4 4 4 3 5% 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	48% 2 4 18% 19% 9%	2848
	11th to 20th	Day	35% 2 6% 20% 27% 11%	2850
	21st to end	Day	54% 1 3 15% 17% 9%	3135
February	1st to 10th	Day	49% 3 7% 15% 17% 9%	1718
	11th to 20th	Day	50% 2 7% 15% 17% 10%	1923
	21st to end	Day	51% 3 7% 15% 16% 8%	1727
March	1st to 10th	Day	58% 2 10% 16% 11% 4	3436
	11th to 20th	Day	53% 2 11% 16% 13% 5%	3480
	21st to end	Day	45% 2 10% 17% 23% 3	3814
April	1st to 10th	Day	43% 4 10% 19% 16% 9%	2194
	11th to 20th	Day	44% 3 11% 18% 16% 9%	2254
	21st to end	Day	36% 4 13% 20% 23% 5%	2280
May	1st to 10th	Day	53% 3 11% 20% 11% 3	3800
	11th to 20th	Day	39% 3 8% 22% 24% 3	3768
	21st to end	Day	41% 4 13% 30% 11% 1	4477
June	1st to 10th	Day	40% 5% 17% 22% 14% 1	2470
	11th to 20th	Day	39% 7% 14% 25% 13% 2	2470
	21st to end	Day	44% 9% 21% 20% 7%	2470
July	1st to 10th	Day	45% 12% 24% 17% 2	4056
	11th to 20th	Day	52% 11% 20% 14% 3	4051
	21st to end	Day	54% 8% 19% 16% 3 1	4325
August	1st to 10th	Day	23% 6% 16% 34% 20%	3946
	11th to 20th	Day	29% 10% 29% 29% 4	3765
	21st to end	Day	48% 8% 14% 15% 14% 2	4179
September	1st to 10th	Day	44% 7% 15% 18% 13% 4	2280
	11th to 20th	Day	46% 6% 13% 18% 13% 5%	2172
	21st to end	Day	38% 4 11% 22% 15% 10%	2027
October	1st to 10th	Day	25% 4 5% 13% 19% 35%	3160
	11th to 20th	Day	20% 2 5% 20% 31% 22%	3140
	21st to end	Day	25% 3 5% 10% 43% 14%	3428
November	1st to 10th	Day	35% 4 9% 19% 23% 11%	1898
	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	44% 2 4 17% 24% 9%	4108
	11th to 20th	Night	38% 2 4 19% 27% 10%	4120
	21st to end	Night	51% 1 4 17% 18% 9%	4532
February	1st to 10th	Night	47% 2 6% 14% 20% 11%	2460
	11th to 20th	Night	45% 3 6% 18% 18% 10%	2169
	21st to end	Night	49% 3 8% 14% 15% 11%	1727
March	1st to 10th	Night	57% 2 9% 15% 12% 6%	3419
	11th to 20th	Night	53% 2 10% 16% 15% 4	3480
	21st to end	Night	40% 2 10% 19% 23% 6%	3817
April	1st to 10th	Night	42% 4 10% 19% 15% 10%	1983
	11th to 20th	Night	36% 3 13% 21% 15% 12%	1875
	21st to end	Night	35% 3 10% 23% 22% 6%	1900
May	1st to 10th	Night	54% 3 11% 16% 11% 4	3160
	11th to 20th	Night	41% 3 10% 19% 25% 2	3130
	21st to end	Night	38% 4 21% 26% 11% 1	3106
June	1st to 10th	Night	26% 5% 21% 31% 15% 1	1710
	11th to 20th	Night	25% 8% 19% 31% 15% 2	1710
	21st to end	Night	32% 8% 27% 23% 9%	1710
July	1st to 10th	Night	35% 11% 33% 17% 3	2805
	11th to 20th	Night	32% 12% 36% 17% 3	2796
	21st to end	Night	41% 11% 24% 19% 4	2999
August	1st to 10th	Night	14% 6% 20% 39% 20%	2949
	11th to 20th	Night	17% 7% 38% 32% 6%	3130
	21st to end	Night	38% 10% 17% 20% 14% 2	3476
September	1st to 10th	Night	32% 8% 22% 21% 13% 4	1900
	11th to 20th	Night	40% 5% 18% 18% 14% 5%	2002
	21st to end	Night	29% 5% 12% 25% 18% 12%	2133
October	1st to 10th	Night	21% 3 8% 15% 18% 36%	3800
	11th to 20th	Night	18% 3 4 22% 31% 22%	3779
	21st to end	Night	20% 2 6% 13% 39% 20%	4120
November	1st to 10th	Night	30% 4 9% 21% 24% 11%	2280
	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	17% 14% 36% 22% 10% 1	270
	21st to end	Day	23% 15% 37% 21% 4	297
February	1st to 10th	Day	21% 17% 35% 20% 6%	270
	11th to 20th	Day	30% 15% 29% 23% 3	270
	21st to end	Day	23% 20% 41% 13% 4	225
March	1st to 10th	Day	27% 13% 34% 19% 6%	270
	11th to 20th	Day	16% 19% 41% 17% 6% 1	270
	21st to end	Day	16% 20% 38% 19% 6% 1	297
April	1st to 10th	Day	16% 13% 32% 29% 9%	374
	11th to 20th	Day	23% 11% 27% 25% 13% 1	452
	21st to end	Day	14% 7% 33% 28% 17% 2	460
May	1st to 10th	Day	15% 10% 24% 34% 14% 3	463
	11th to 20th	Day	12% 5% 19% 36% 23% 5%	487
	21st to end	Day	6% 3 25% 35% 23% 8%	722
June	1st to 10th	Day	7% 2 14% 35% 28% 14%	680
	11th to 20th	Day	6% 2 14% 34% 32% 12%	680
	21st to end	Day	10% 2 10% 26% 32% 20%	680
July	1st to 10th	Day	7% 3 6% 27% 37% 21%	671
	11th to 20th	Day	6% 2 5% 23% 38% 25%	668
	21st to end	Day	8% 2 5% 25% 37% 23%	739
August	1st to 10th	Day	4 1 2 19% 43% 31%	597
	11th to 20th	Day	5% 2 3 11% 43% 36%	479
	21st to end	Day	12% 2 6% 17% 36% 27%	539
September	1st to 10th	Day	10% 3 6% 19% 40% 23%	490
	11th to 20th	Day	14% 3 5% 26% 36% 17%	382
	21st to end	Day	11% 1 12% 28% 37% 12%	300
October	1st to 10th	Day	8% 2 17% 38% 27% 8%	300
	11th to 20th	Day	9% 4 17% 38% 19% 13%	300
	21st to end	Day	15% 9% 21% 33% 16% 7%	330
November	1st to 10th	Day	13% 6% 24% 28% 23% 5%	282
	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% 31% 33% 8% 1	950
	21st to end	Night	22% 8% 32% 31% 7%	1045
February	1st to 10th	Night	22% 9% 32% 32% 5%	940
	11th to 20th	Night	23% 10% 30% 31% 6%	693
	21st to end	Night	24% 11% 34% 28% 4	471
March	1st to 10th	Night	20% 6% 30% 34% 9%	570
	11th to 20th	Night	19% 6% 31% 33% 11%	570
	21st to end	Night	17% 6% 30% 36% 12%	627
April	1st to 10th	Night	18% 6% 31% 34% 11% 1	570
	11th to 20th	Night	16% 9% 28% 31% 15%	563
	21st to end	Night	11% 4 31% 39% 15% 1	570
May	1st to 10th	Night	15% 5% 22% 42% 14% 1	570
	11th to 20th	Night	10% 2 24% 40% 22% 1	561
	21st to end	Night	7% 3 13% 39% 34% 4	617
June	1st to 10th	Night	6% 1 6% 32% 48% 8%	570
	11th to 20th	Night	5% 1 5% 33% 48% 8%	570
	21st to end	Night	9% 1 5% 22% 48% 15%	570
July	1st to 10th	Night	5% 2 2 18% 54% 19%	555
	11th to 20th	Night	5% 1 2 14% 54% 24%	552
	21st to end	Night	5% 1 2 19% 53% 20%	624
August	1st to 10th	Night	4 1 1 13% 61% 20%	567
	11th to 20th	Night	5% 1 1 14% 57% 22%	564
	21st to end	Night	10% 1 4 18% 48% 19%	627
September	1st to 10th	Night	9% 2 4 18% 50% 17%	570
	11th to 20th	Night	12% 2 5% 23% 49% 9%	570
	21st to end	Night	9% 1 7% 32% 45% 7%	613
October	1st to 10th	Night	7% 2 8% 39% 38% 7%	760
	11th to 20th	Night	10% 2 18% 40% 26% 4	760
	21st to end	Night	12% 5% 17% 39% 24% 3	836
November	1st to 10th	Night	10% 3 19% 42% 24% 3	760
	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

Page generated at 2024-11-03 01:11:27. Version ac07

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