Catahoula Lake
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Catahoula Lake clear sky chart from 2005-11-06 to 2026-04-17.

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% 2 6% 5% 4 5% 4 6% 7% 42%	131386
	Night	14% 6% 2 6% 4 4 4 3 5% 7% 45%	131000
Transparency	Day	40% 4 11% 20% 18% 7%	134993
	Night	38% 4 11% 19% 20% 9%	135471
Seeing	Day	14% 9% 21% 24% 22% 9%	16865
	Night	15% 8% 25% 30% 19% 3	26717

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 7% 4 3 3 3 4 6% 42%	5289
	11th to 20th	Day	10% 6% 3 5% 4 3 4 3 5% 7% 51%	5310
	21st to end	Day	24% 11% 3 7% 4 3 3 2 3 5% 35%	5812
February	1st to 10th	Day	19% 10% 3 6% 4 4 3 2 4 4 40%	1969
	11th to 20th	Day	19% 9% 4 7% 5% 3 3 3 5% 5% 38%	2048
	21st to end	Day	18% 10% 3 8% 4 3 4 3 5% 5% 36%	1824
March	1st to 10th	Day	20% 10% 3 8% 5% 4 4 3 4 5% 34%	5046
	11th to 20th	Day	13% 7% 2 6% 4 4 4 3 4 6% 46%	5090
	21st to end	Day	13% 9% 3 8% 5% 4 3 3 5% 6% 41%	5583
April	1st to 10th	Day	12% 8% 2 7% 5% 4 5% 4 5% 7% 42%	2515
	11th to 20th	Day	14% 7% 3 7% 5% 4 3 4 5% 7% 41%	2446
	21st to end	Day	11% 6% 2 6% 4 5% 5% 4 7% 6% 42%	2400
May	1st to 10th	Day	17% 9% 3 8% 5% 4 4 4 6% 8% 33%	5405
	11th to 20th	Day	11% 6% 3 7% 5% 5% 5% 4 7% 8% 40%	5404
	21st to end	Day	8% 6% 2 7% 5% 5% 6% 4 7% 9% 40%	6288
June	1st to 10th	Day	8% 5% 3 7% 6% 7% 6% 6% 7% 10% 36%	2600
	11th to 20th	Day	5% 6% 2 5% 6% 6% 6% 6% 8% 9% 40%	2600
	21st to end	Day	7% 4 2 6% 6% 6% 7% 5% 9% 11% 37%	2600
July	1st to 10th	Day	5% 5% 3 8% 7% 8% 8% 6% 8% 11% 32%	5900
	11th to 20th	Day	6% 5% 3 7% 5% 6% 7% 6% 9% 10% 37%	5900
	21st to end	Day	11% 7% 3 7% 5% 5% 6% 5% 7% 10% 34%	6422
August	1st to 10th	Day	3 2 1 3 3 4 4 3 6% 8% 63%	4003
	11th to 20th	Day	5% 3 2 4 4 4 5% 4 8% 13% 49%	3849
	21st to end	Day	11% 6% 2 6% 5% 6% 5% 4 7% 8% 39%	4312
September	1st to 10th	Day	10% 5% 2 6% 5% 6% 6% 4 7% 9% 41%	2400
	11th to 20th	Day	12% 6% 2 6% 4 5% 5% 4 6% 7% 43%	2400
	21st to end	Day	10% 4 2 5% 3 4 4 3 4 7% 54%	2108
October	1st to 10th	Day	6% 4 2 5% 4 4 3 2 5% 6% 59%	2000
	11th to 20th	Day	9% 4 1 5% 2 3 3 3 5% 5% 59%	2000
	21st to end	Day	12% 5% 2 5% 3 3 3 2 4 6% 55%	2200
November	1st to 10th	Day	11% 6% 2 6% 3 3 3 3 4 6% 53%	2058
	11th to 20th	Day	11% 5% 2 5% 3 3 3 3 4 6% 54%	2100
	21st to end	Day	15% 7% 2 7% 4 5% 3 3 5% 6% 44%	2100
December	1st to 10th	Day	20% 8% 2 6% 4 4 4 3 4 5% 41%	3337
	11th to 20th	Day	14% 9% 3 7% 5% 4 4 3 5% 6% 40%	3481
	21st to end	Day	17% 8% 2 6% 3 2 3 2 4 5% 48%	4587
January	1st to 10th	Night	19% 6% 2 5% 3 3 3 2 4 6% 48%	7634
	11th to 20th	Night	14% 8% 2 6% 3 3 3 3 4 6% 47%	7680
	21st to end	Night	27% 8% 3 6% 3 3 4 3 5% 5% 32%	8402
February	1st to 10th	Night	16% 7% 3 5% 4 3 3 3 5% 6% 44%	2648
	11th to 20th	Night	22% 9% 2 6% 3 3 2 3 4 5% 42%	2458
	21st to end	Night	21% 9% 3 7% 3 4 3 3 4 5% 39%	1999
March	1st to 10th	Night	19% 9% 3 7% 4 4 4 3 4 5% 37%	5029
	11th to 20th	Night	15% 7% 2 6% 4 4 4 3 4 6% 45%	5090
	21st to end	Night	17% 7% 3 6% 4 4 4 3 4 6% 43%	5588
April	1st to 10th	Night	14% 5% 2 5% 5% 3 5% 4 5% 7% 46%	2105
	11th to 20th	Night	14% 6% 3 5% 4 3 3 3 6% 6% 47%	2035
	21st to end	Night	10% 4 3 5% 5% 4 4 4 6% 7% 50%	2000
May	1st to 10th	Night	14% 8% 2 7% 5% 4 5% 3 6% 8% 37%	4490
	11th to 20th	Night	16% 6% 2 6% 4 4 4 3 6% 8% 41%	4489
	21st to end	Night	9% 6% 2 6% 5% 5% 5% 4 8% 10% 41%	4578
June	1st to 10th	Night	6% 5% 2 6% 4 4 5% 5% 7% 9% 47%	1800
	11th to 20th	Night	4 3 1 5% 5% 4 4 4 7% 10% 53%	1800
	21st to end	Night	6% 4 2 4 4 4 5% 5% 9% 11% 46%	1800
July	1st to 10th	Night	5% 5% 2 7% 5% 5% 7% 7% 9% 11% 36%	4078
	11th to 20th	Night	6% 4 2 5% 3 4 5% 5% 8% 14% 44%	4077
	21st to end	Night	8% 6% 3 8% 5% 5% 5% 4 7% 10% 38%	4449
August	1st to 10th	Night	2 1 1 2 2 2 4 3 5% 10% 67%	3144
	11th to 20th	Night	3 3 1 5% 3 5% 4 4 8% 14% 49%	3200
	21st to end	Night	8% 5% 3 8% 5% 5% 5% 4 6% 7% 44%	3586
September	1st to 10th	Night	7% 6% 2 7% 4 5% 4 5% 7% 8% 46%	2000
	11th to 20th	Night	9% 6% 2 5% 5% 5% 5% 5% 6% 7% 46%	2000
	21st to end	Night	8% 5% 2 5% 3 4 4 3 6% 6% 56%	2264
October	1st to 10th	Night	6% 4 1 4 3 4 4 3 5% 6% 60%	2400
	11th to 20th	Night	9% 5% 2 4 3 3 3 3 4 5% 60%	2400
	21st to end	Night	12% 5% 1 4 2 4 3 3 3 5% 58%	2640
November	1st to 10th	Night	12% 5% 2 5% 3 3 3 2 5% 6% 54%	2460
	11th to 20th	Night	12% 4 2 4 3 3 3 3 4 7% 55%	2520
	21st to end	Night	14% 6% 2 6% 4 3 4 3 5% 5% 47%	2520
December	1st to 10th	Night	22% 7% 2 6% 4 4 3 2 3 6% 42%	4058
	11th to 20th	Night	15% 8% 2 7% 4 4 3 3 5% 6% 42%	4946
	21st to end	Night	17% 9% 3 5% 3 3 2 2 4 5% 48%	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	45% 3 5% 23% 21% 2	5290
	11th to 20th	Day	34% 2 7% 20% 29% 8%	5310
	21st to end	Day	54% 2 4 11% 17% 13%	5812
February	1st to 10th	Day	49% 2 5% 15% 18% 10%	1969
	11th to 20th	Day	49% 4 6% 16% 17% 8%	2058
	21st to end	Day	50% 4 6% 12% 17% 11%	1824
March	1st to 10th	Day	53% 3 6% 13% 15% 10%	5046
	11th to 20th	Day	40% 3 6% 16% 21% 14%	5090
	21st to end	Day	46% 3 9% 19% 18% 6%	5585
April	1st to 10th	Day	43% 4 9% 21% 16% 8%	2515
	11th to 20th	Day	43% 3 8% 18% 19% 8%	2446
	21st to end	Day	39% 6% 9% 21% 21% 4	2400
May	1st to 10th	Day	49% 4 11% 23% 10% 2	5440
	11th to 20th	Day	42% 4 15% 19% 19% 1	5408
	21st to end	Day	38% 4 13% 28% 15% 1	6301
June	1st to 10th	Day	40% 7% 15% 22% 14% 2	2600
	11th to 20th	Day	36% 7% 15% 23% 16% 2	2600
	21st to end	Day	38% 9% 17% 23% 12% 1	2600
July	1st to 10th	Day	43% 8% 23% 19% 7% 1	5836
	11th to 20th	Day	38% 8% 27% 24% 3	5831
	21st to end	Day	44% 7% 17% 25% 7%	6240
August	1st to 10th	Day	20% 5% 12% 35% 26% 1	3989
	11th to 20th	Day	26% 6% 22% 37% 9% 1	3885
	21st to end	Day	42% 7% 15% 15% 20% 2	4311
September	1st to 10th	Day	38% 7% 15% 19% 16% 6%	2400
	11th to 20th	Day	38% 6% 13% 20% 18% 6%	2400
	21st to end	Day	32% 4 9% 23% 22% 10%	2108
October	1st to 10th	Day	19% 4 6% 14% 21% 36%	3260
	11th to 20th	Day	18% 2 4 17% 31% 29%	3240
	21st to end	Day	24% 2 4 17% 38% 15%	3538
November	1st to 10th	Day	35% 3 6% 18% 27% 10%	2058
	11th to 20th	Day	33% 3 7% 17% 27% 13%	2100
	21st to end	Day	41% 3 7% 19% 22% 8%	2100
December	1st to 10th	Day	47% 2 7% 17% 22% 5%	3337
	11th to 20th	Day	46% 3 7% 15% 21% 10%	3479
	21st to end	Day	41% 2 5% 22% 27% 3	4587
January	1st to 10th	Night	40% 2 8% 23% 21% 6%	7635
	11th to 20th	Night	39% 3 5% 16% 27% 11%	7680
	21st to end	Night	54% 3 5% 13% 17% 8%	8402
February	1st to 10th	Night	43% 3 6% 17% 21% 10%	2648
	11th to 20th	Night	47% 3 6% 16% 18% 10%	2459
	21st to end	Night	49% 4 7% 13% 14% 14%	1999
March	1st to 10th	Night	50% 3 5% 12% 21% 9%	5029
	11th to 20th	Night	41% 2 7% 14% 17% 18%	5090
	21st to end	Night	44% 3 9% 17% 21% 6%	5588
April	1st to 10th	Night	37% 6% 10% 19% 17% 10%	2105
	11th to 20th	Night	38% 4 10% 19% 19% 11%	2035
	21st to end	Night	33% 5% 9% 23% 24% 6%	2000
May	1st to 10th	Night	45% 4 13% 22% 13% 4	4520
	11th to 20th	Night	41% 3 15% 22% 17% 2	4490
	21st to end	Night	37% 4 18% 26% 14% 1	4587
June	1st to 10th	Night	32% 7% 18% 23% 18% 1	1800
	11th to 20th	Night	25% 6% 21% 29% 16% 3	1800
	21st to end	Night	29% 9% 20% 28% 14% 1	1800
July	1st to 10th	Night	38% 10% 27% 17% 7%	4035
	11th to 20th	Night	29% 10% 34% 22% 5%	4026
	21st to end	Night	41% 8% 18% 24% 8% 1	4320
August	1st to 10th	Night	14% 6% 17% 33% 29% 2	3134
	11th to 20th	Night	24% 7% 26% 34% 8% 1	3230
	21st to end	Night	39% 7% 14% 18% 18% 4	3586
September	1st to 10th	Night	34% 8% 16% 21% 14% 7%	2000
	11th to 20th	Night	35% 7% 14% 19% 18% 7%	2000
	21st to end	Night	28% 5% 10% 22% 22% 13%	2264
October	1st to 10th	Night	19% 4 6% 14% 22% 35%	3920
	11th to 20th	Night	17% 2 3 19% 29% 29%	3899
	21st to end	Night	22% 2 4 14% 37% 21%	4252
November	1st to 10th	Night	32% 3 8% 17% 26% 13%	2460
	11th to 20th	Night	31% 3 8% 17% 26% 15%	2520
	21st to end	Night	39% 3 7% 17% 23% 11%	2520
December	1st to 10th	Night	47% 2 6% 16% 26% 4	4058
	11th to 20th	Night	43% 3 7% 14% 24% 8%	4947
	21st to end	Night	41% 3 5% 20% 26% 6%	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	26% 20% 35% 15% 4	330
	11th to 20th	Day	22% 25% 33% 15% 5% 1	330
	21st to end	Day	33% 17% 31% 17% 3	363
February	1st to 10th	Day	23% 19% 33% 19% 5% 1	330
	11th to 20th	Day	36% 18% 33% 9% 4	330
	21st to end	Day	25% 30% 33% 10% 1	273
March	1st to 10th	Day	26% 15% 35% 19% 5%	330
	11th to 20th	Day	22% 22% 36% 15% 4	330
	21st to end	Day	15% 20% 36% 21% 7% 1	363
April	1st to 10th	Day	19% 19% 33% 22% 7%	535
	11th to 20th	Day	20% 18% 31% 18% 12% 1	516
	21st to end	Day	14% 14% 29% 28% 15% 1	500
May	1st to 10th	Day	18% 12% 29% 27% 12% 2	503
	11th to 20th	Day	14% 7% 24% 30% 18% 7%	527
	21st to end	Day	10% 6% 23% 34% 21% 6%	721
June	1st to 10th	Day	10% 4 14% 34% 30% 9%	730
	11th to 20th	Day	7% 2 16% 37% 28% 9%	730
	21st to end	Day	8% 2 11% 27% 33% 19%	730
July	1st to 10th	Day	7% 3 6% 24% 40% 20%	721
	11th to 20th	Day	5% 1 7% 24% 41% 22%	718
	21st to end	Day	8% 2 8% 26% 38% 18%	794
August	1st to 10th	Day	5% 1 5% 25% 39% 24%	586
	11th to 20th	Day	6% 1 5% 17% 45% 26%	519
	21st to end	Day	13% 3 8% 20% 34% 22%	583
September	1st to 10th	Day	9% 1 11% 26% 35% 18%	530
	11th to 20th	Day	12% 2 11% 23% 33% 20%	530
	21st to end	Day	11% 4 14% 30% 27% 14%	377
October	1st to 10th	Day	5% 4 27% 35% 23% 5%	330
	11th to 20th	Day	9% 7% 25% 32% 21% 7%	330
	21st to end	Day	18% 9% 26% 25% 17% 5%	363
November	1st to 10th	Day	17% 11% 25% 29% 15% 3	330
	11th to 20th	Day	15% 11% 30% 29% 13% 2	330
	21st to end	Day	18% 18% 32% 19% 11% 2	330
December	1st to 10th	Day	22% 14% 36% 17% 10% 1	330
	11th to 20th	Day	23% 12% 38% 19% 8%	330
	21st to end	Day	22% 18% 32% 20% 7% 1	363
January	1st to 10th	Night	23% 14% 36% 22% 5%	1050
	11th to 20th	Night	21% 15% 32% 24% 7%	1050
	21st to end	Night	25% 13% 34% 24% 4	1155
February	1st to 10th	Night	20% 15% 36% 25% 4	968
	11th to 20th	Night	29% 14% 29% 24% 4	823
	21st to end	Night	26% 18% 35% 18% 3	615
March	1st to 10th	Night	22% 12% 34% 26% 5%	630
	11th to 20th	Night	18% 15% 38% 23% 6%	630
	21st to end	Night	18% 8% 40% 26% 8%	693
April	1st to 10th	Night	17% 13% 38% 26% 6%	630
	11th to 20th	Night	17% 13% 36% 23% 10%	611
	21st to end	Night	10% 9% 36% 32% 12% 1	600
May	1st to 10th	Night	12% 9% 33% 34% 12% 1	600
	11th to 20th	Night	12% 5% 33% 31% 18% 1	591
	21st to end	Night	7% 4 23% 40% 21% 4	650
June	1st to 10th	Night	8% 2 13% 43% 31% 4	600
	11th to 20th	Night	5% 2 15% 43% 31% 4	600
	21st to end	Night	9% 2 9% 34% 36% 12%	600
July	1st to 10th	Night	5% 2 7% 31% 46% 8%	585
	11th to 20th	Night	5% 1 7% 34% 39% 14%	582
	21st to end	Night	6% 1 6% 37% 39% 10%	657
August	1st to 10th	Night	4 1 5% 34% 44% 12%	597
	11th to 20th	Night	4 1 4 32% 45% 13%	594
	21st to end	Night	10% 3 7% 29% 38% 12%	660
September	1st to 10th	Night	8% 2 10% 34% 40% 6%	600
	11th to 20th	Night	12% 2 9% 27% 42% 8%	600
	21st to end	Night	11% 2 12% 34% 36% 5%	716
October	1st to 10th	Night	7% 2 20% 35% 32% 4	800
	11th to 20th	Night	11% 5% 25% 35% 22% 3	800
	21st to end	Night	14% 7% 24% 35% 18% 2	880
November	1st to 10th	Night	14% 5% 25% 34% 20% 2	820
	11th to 20th	Night	15% 8% 30% 33% 14%	840
	21st to end	Night	18% 10% 32% 27% 12% 1	840
December	1st to 10th	Night	23% 12% 27% 29% 8%	845
	11th to 20th	Night	23% 10% 30% 28% 9%	1050
	21st to end	Night	24% 13% 31% 25% 7%	1155

Page generated at 2026-04-14 01:44:28. Version ac07

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