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 2024-12-24.

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% 5% 5% 4 6% 7% 41%	101275
	Night	13% 6% 2 6% 4 4 4 3 5% 7% 45%	98888
Transparency	Day	40% 4 11% 20% 18% 7%	104921
	Night	37% 5% 11% 19% 20% 9%	103383
Seeing	Day	14% 9% 20% 24% 23% 10%	15165
	Night	15% 8% 25% 30% 19% 3	24964

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	19% 10% 2 6% 3 3 4 3 4 7% 40%	2847
	11th to 20th	Day	17% 7% 3 5% 3 2 3 2 4 4 50%	2850
	21st to end	Day	23% 10% 3 6% 5% 3 3 2 3 6% 37%	3135
February	1st to 10th	Day	19% 10% 3 6% 5% 4 3 2 4 4 39%	1781
	11th to 20th	Day	19% 9% 4 7% 4 3 3 2 5% 5% 39%	1848
	21st to end	Day	19% 11% 3 7% 4 3 4 3 5% 5% 35%	1655
March	1st to 10th	Day	21% 11% 3 9% 5% 4 4 4 5% 6% 28%	3436
	11th to 20th	Day	16% 9% 3 8% 5% 5% 4 4 5% 7% 34%	3480
	21st to end	Day	14% 10% 3 8% 6% 4 3 2 4 5% 41%	3814
April	1st to 10th	Day	12% 8% 2 7% 5% 4 4 4 5% 7% 43%	2275
	11th to 20th	Day	15% 7% 3 7% 5% 4 3 4 5% 6% 40%	2254
	21st to end	Day	11% 6% 2 6% 4 5% 5% 4 7% 6% 42%	2280
May	1st to 10th	Day	13% 9% 3 8% 6% 5% 5% 4 6% 8% 34%	3765
	11th to 20th	Day	12% 6% 3 7% 4 4 4 4 6% 6% 44%	3764
	21st to end	Day	8% 6% 2 7% 5% 5% 6% 5% 7% 9% 40%	4373
June	1st to 10th	Day	8% 5% 3 7% 6% 7% 7% 6% 8% 10% 36%	2470
	11th to 20th	Day	5% 6% 2 5% 6% 6% 6% 6% 8% 9% 40%	2470
	21st to end	Day	7% 4 2 6% 6% 6% 7% 5% 9% 11% 35%	2470
July	1st to 10th	Day	6% 6% 3 8% 7% 8% 7% 6% 8% 10% 32%	4120
	11th to 20th	Day	7% 6% 3 8% 6% 7% 8% 6% 10% 10% 28%	4120
	21st to end	Day	16% 9% 3 8% 6% 5% 6% 5% 6% 8% 28%	4465
August	1st to 10th	Day	3 3 1 3 3 3 4 3 5% 8% 63%	3880
	11th to 20th	Day	5% 3 2 4 4 4 5% 4 8% 13% 49%	3729
	21st to end	Day	11% 6% 2 6% 5% 6% 5% 4 6% 8% 39%	4180
September	1st to 10th	Day	10% 5% 2 6% 5% 6% 6% 4 7% 9% 39%	2280
	11th to 20th	Day	13% 6% 2 6% 5% 5% 5% 4 6% 7% 42%	2280
	21st to end	Day	11% 4 2 5% 3 4 4 3 4 7% 54%	2003
October	1st to 10th	Day	6% 4 2 5% 4 4 3 2 5% 6% 59%	1900
	11th to 20th	Day	10% 4 2 5% 2 3 3 3 5% 5% 57%	1900
	21st to end	Day	13% 5% 2 5% 3 3 3 2 4 6% 55%	2090
November	1st to 10th	Day	11% 7% 2 6% 3 3 3 3 4 6% 52%	1958
	11th to 20th	Day	12% 5% 2 5% 3 3 3 3 3 5% 54%	2000
	21st to end	Day	14% 7% 2 7% 4 5% 3 3 5% 6% 44%	2000
December	1st to 10th	Day	18% 8% 2 6% 3 4 4 3 5% 5% 42%	1990
	11th to 20th	Day	15% 10% 3 7% 4 3 4 3 4 7% 39%	2251
	21st to end	Day	17% 9% 2 6% 3 3 4 3 5% 5% 43%	3162
January	1st to 10th	Night	17% 7% 2 6% 4 3 3 3 4 6% 46%	4108
	11th to 20th	Night	15% 7% 2 5% 3 3 3 2 4 5% 50%	4120
	21st to end	Night	25% 7% 2 5% 3 2 3 3 3 5% 41%	4532
February	1st to 10th	Night	17% 8% 3 5% 4 3 4 3 5% 6% 42%	2396
	11th to 20th	Night	22% 9% 2 5% 3 3 2 3 4 5% 43%	2218
	21st to end	Night	22% 8% 3 7% 3 4 3 3 4 6% 38%	1815
March	1st to 10th	Night	23% 9% 3 8% 5% 4 4 3 4 5% 32%	3419
	11th to 20th	Night	16% 8% 3 7% 5% 5% 5% 4 5% 7% 36%	3480
	21st to end	Night	14% 7% 3 6% 4 4 4 3 5% 7% 42%	3817
April	1st to 10th	Night	13% 5% 2 5% 4 3 5% 4 6% 7% 47%	1905
	11th to 20th	Night	15% 6% 3 5% 4 3 3 3 6% 6% 45%	1875
	21st to end	Night	9% 4 3 5% 4 4 4 3 6% 7% 51%	1900
May	1st to 10th	Night	13% 7% 2 7% 5% 4 4 4 6% 9% 38%	3130
	11th to 20th	Night	15% 6% 2 5% 4 4 4 3 5% 7% 44%	3129
	21st to end	Night	9% 6% 2 6% 5% 5% 5% 3 8% 10% 41%	3186
June	1st to 10th	Night	6% 5% 2 6% 5% 4 5% 5% 7% 8% 46%	1710
	11th to 20th	Night	4 3 1 4 4 4 4 4 7% 10% 53%	1710
	21st to end	Night	6% 4 3 4 4 4 5% 5% 9% 10% 46%	1710
July	1st to 10th	Night	6% 6% 3 7% 5% 5% 7% 6% 8% 11% 36%	2850
	11th to 20th	Night	8% 5% 2 6% 4 5% 6% 5% 8% 12% 38%	2850
	21st to end	Night	10% 8% 3 9% 5% 5% 5% 3 7% 10% 34%	3098
August	1st to 10th	Night	2 1 1 2 2 2 4 3 5% 10% 67%	3047
	11th to 20th	Night	3 3 1 5% 3 5% 4 4 8% 14% 49%	3100
	21st to end	Night	8% 5% 3 8% 5% 5% 5% 4 6% 7% 44%	3476
September	1st to 10th	Night	7% 6% 2 7% 4 5% 4 5% 7% 8% 45%	1900
	11th to 20th	Night	9% 6% 2 5% 5% 4 5% 5% 6% 7% 45%	1900
	21st to end	Night	9% 5% 2 4 3 4 4 3 6% 6% 55%	2150
October	1st to 10th	Night	6% 4 1 4 3 4 4 4 5% 6% 59%	2280
	11th to 20th	Night	9% 5% 2 4 3 3 3 3 4 5% 59%	2280
	21st to end	Night	12% 5% 1 4 2 4 3 3 3 5% 58%	2508
November	1st to 10th	Night	12% 5% 2 5% 3 3 3 3 5% 6% 53%	2340
	11th to 20th	Night	13% 4 2 4 4 3 3 3 4 7% 55%	2400
	21st to end	Night	14% 7% 2 6% 4 3 4 3 5% 5% 47%	2400
December	1st to 10th	Night	18% 7% 2 6% 4 3 3 3 4 6% 45%	2405
	11th to 20th	Night	15% 8% 2 8% 4 4 3 3 5% 5% 43%	3166
	21st to end	Night	17% 10% 3 5% 3 3 3 3 4 6% 43%	4578

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	46% 2 3 19% 25% 5%	2848
	11th to 20th	Day	39% 2 7% 19% 26% 7%	2850
	21st to end	Day	51% 2 4 14% 19% 9%	3135
February	1st to 10th	Day	50% 3 6% 14% 18% 10%	1781
	11th to 20th	Day	48% 4 5% 16% 18% 9%	1858
	21st to end	Day	51% 4 7% 13% 16% 10%	1655
March	1st to 10th	Day	58% 3 7% 13% 13% 5%	3436
	11th to 20th	Day	49% 4 7% 20% 16% 4	3480
	21st to end	Day	47% 3 7% 17% 21% 5%	3814
April	1st to 10th	Day	42% 4 9% 21% 16% 8%	2275
	11th to 20th	Day	45% 3 8% 18% 17% 8%	2254
	21st to end	Day	39% 6% 9% 21% 22% 4	2280
May	1st to 10th	Day	48% 4 11% 22% 12% 3	3800
	11th to 20th	Day	40% 3 11% 19% 24% 2	3768
	21st to end	Day	39% 5% 14% 30% 11% 2	4385
June	1st to 10th	Day	41% 7% 15% 22% 13% 2	2470
	11th to 20th	Day	36% 7% 15% 24% 16% 2	2470
	21st to end	Day	39% 9% 16% 21% 12% 2	2470
July	1st to 10th	Day	44% 8% 21% 20% 6% 1	4056
	11th to 20th	Day	46% 8% 22% 18% 4	4051
	21st to end	Day	53% 7% 14% 20% 6% 1	4325
August	1st to 10th	Day	20% 5% 12% 35% 27% 1	3866
	11th to 20th	Day	26% 6% 21% 37% 9% 1	3765
	21st to end	Day	42% 7% 14% 15% 20% 2	4179
September	1st to 10th	Day	40% 7% 14% 19% 15% 6%	2280
	11th to 20th	Day	39% 6% 13% 18% 18% 6%	2280
	21st to end	Day	33% 4 9% 24% 21% 10%	2003
October	1st to 10th	Day	19% 3 6% 14% 21% 37%	3160
	11th to 20th	Day	18% 2 4 16% 31% 29%	3140
	21st to end	Day	24% 2 4 16% 38% 16%	3428
November	1st to 10th	Day	36% 3 6% 18% 27% 10%	1958
	11th to 20th	Day	34% 3 6% 15% 28% 14%	2000
	21st to end	Day	42% 3 7% 19% 22% 8%	2000
December	1st to 10th	Day	45% 2 10% 18% 17% 7%	1990
	11th to 20th	Day	46% 3 6% 14% 24% 7%	2249
	21st to end	Day	44% 2 6% 17% 27% 4	3162
January	1st to 10th	Night	41% 3 5% 17% 26% 8%	4108
	11th to 20th	Night	37% 3 7% 19% 24% 9%	4120
	21st to end	Night	47% 3 7% 17% 20% 7%	4532
February	1st to 10th	Night	44% 3 6% 17% 20% 10%	2396
	11th to 20th	Night	45% 3 5% 16% 20% 11%	2219
	21st to end	Night	49% 4 7% 13% 14% 13%	1815
March	1st to 10th	Night	55% 4 6% 14% 15% 6%	3419
	11th to 20th	Night	48% 3 10% 16% 17% 6%	3480
	21st to end	Night	43% 3 10% 16% 23% 5%	3817
April	1st to 10th	Night	36% 6% 10% 20% 18% 11%	1905
	11th to 20th	Night	39% 4 10% 18% 18% 12%	1875
	21st to end	Night	32% 5% 9% 23% 25% 6%	1900
May	1st to 10th	Night	42% 5% 13% 20% 15% 5%	3160
	11th to 20th	Night	40% 4 10% 21% 22% 2	3130
	21st to end	Night	38% 4 18% 25% 14% 1	3195
June	1st to 10th	Night	33% 8% 17% 23% 17% 1	1710
	11th to 20th	Night	25% 6% 20% 29% 17% 3	1710
	21st to end	Night	30% 9% 19% 28% 14% 1	1710
July	1st to 10th	Night	39% 11% 25% 18% 6% 1	2805
	11th to 20th	Night	36% 9% 27% 21% 6%	2796
	21st to end	Night	46% 8% 19% 21% 6% 1	2999
August	1st to 10th	Night	13% 6% 17% 32% 29% 2	3037
	11th to 20th	Night	23% 7% 25% 34% 8% 1	3130
	21st to end	Night	39% 7% 14% 18% 18% 4	3476
September	1st to 10th	Night	34% 8% 16% 21% 14% 8%	1900
	11th to 20th	Night	36% 7% 14% 17% 18% 8%	1900
	21st to end	Night	29% 5% 9% 22% 22% 13%	2150
October	1st to 10th	Night	19% 4 6% 14% 21% 35%	3800
	11th to 20th	Night	17% 2 4 19% 28% 30%	3779
	21st to end	Night	22% 2 4 13% 37% 21%	4120
November	1st to 10th	Night	33% 3 8% 17% 26% 13%	2340
	11th to 20th	Night	32% 3 8% 16% 26% 15%	2400
	21st to end	Night	39% 3 7% 16% 24% 11%	2400
December	1st to 10th	Night	42% 3 9% 19% 21% 7%	2405
	11th to 20th	Night	44% 3 6% 13% 24% 10%	3167
	21st to end	Night	44% 3 5% 20% 22% 6%	4578

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	25% 19% 35% 16% 5%	270
	11th to 20th	Day	23% 23% 32% 16% 5% 1	270
	21st to end	Day	29% 19% 32% 16% 4	297
February	1st to 10th	Day	26% 20% 29% 19% 6% 1	270
	11th to 20th	Day	35% 17% 34% 10% 3	270
	21st to end	Day	28% 29% 33% 10%	225
March	1st to 10th	Day	24% 17% 34% 20% 5%	270
	11th to 20th	Day	21% 22% 37% 16% 4	270
	21st to end	Day	16% 22% 36% 20% 6%	297
April	1st to 10th	Day	19% 18% 33% 22% 7%	455
	11th to 20th	Day	21% 18% 30% 17% 12% 2	452
	21st to end	Day	15% 14% 29% 27% 15% 1	460
May	1st to 10th	Day	17% 11% 29% 28% 13% 2	463
	11th to 20th	Day	13% 6% 23% 32% 19% 7%	487
	21st to end	Day	9% 6% 22% 34% 22% 7%	669
June	1st to 10th	Day	10% 3 13% 34% 31% 9%	680
	11th to 20th	Day	7% 3 15% 36% 29% 10%	680
	21st to end	Day	9% 2 11% 27% 32% 19%	680
July	1st to 10th	Day	7% 2 6% 24% 39% 21%	671
	11th to 20th	Day	5% 1 6% 24% 41% 23%	668
	21st to end	Day	9% 2 8% 26% 38% 17%	739
August	1st to 10th	Day	6% 1 4 25% 39% 24%	543
	11th to 20th	Day	7% 1 6% 17% 44% 25%	479
	21st to end	Day	13% 3 7% 19% 35% 23%	539
September	1st to 10th	Day	9% 1 9% 26% 35% 20%	490
	11th to 20th	Day	12% 2 11% 22% 33% 19%	490
	21st to end	Day	12% 3 13% 28% 28% 15%	345
October	1st to 10th	Day	5% 4 25% 36% 24% 5%	300
	11th to 20th	Day	10% 7% 26% 31% 19% 7%	300
	21st to end	Day	18% 10% 25% 25% 17% 5%	330
November	1st to 10th	Day	17% 10% 26% 30% 14% 3	300
	11th to 20th	Day	16% 12% 30% 27% 13% 2	300
	21st to end	Day	19% 18% 31% 19% 11% 2	300
December	1st to 10th	Day	20% 14% 36% 18% 11% 1	300
	11th to 20th	Day	24% 13% 38% 18% 7%	300
	21st to end	Day	23% 17% 33% 19% 7% 1	306
January	1st to 10th	Night	23% 14% 35% 23% 6%	950
	11th to 20th	Night	21% 14% 32% 26% 7%	950
	21st to end	Night	24% 13% 35% 23% 4	1045
February	1st to 10th	Night	21% 15% 34% 25% 5%	876
	11th to 20th	Night	27% 14% 30% 25% 4	743
	21st to end	Night	26% 18% 35% 19% 3	559
March	1st to 10th	Night	21% 12% 34% 28% 6%	570
	11th to 20th	Night	17% 14% 39% 23% 6% 1	570
	21st to end	Night	18% 9% 39% 26% 8%	627
April	1st to 10th	Night	16% 12% 38% 26% 6% 1	570
	11th to 20th	Night	18% 13% 35% 24% 10%	563
	21st to end	Night	9% 9% 37% 32% 12% 1	570
May	1st to 10th	Night	11% 9% 33% 34% 12% 1	570
	11th to 20th	Night	11% 4 33% 32% 18% 1	561
	21st to end	Night	7% 4 23% 40% 22% 4	617
June	1st to 10th	Night	8% 2 13% 42% 32% 4	570
	11th to 20th	Night	5% 1 14% 43% 32% 5%	570
	21st to end	Night	9% 2 9% 35% 33% 12%	570
July	1st to 10th	Night	5% 2 7% 32% 45% 9%	555
	11th to 20th	Night	6% 1 7% 33% 39% 14%	552
	21st to end	Night	6% 1 6% 38% 39% 10%	624
August	1st to 10th	Night	4 1 5% 33% 45% 12%	567
	11th to 20th	Night	5% 1 5% 33% 45% 13%	564
	21st to end	Night	10% 3 7% 29% 39% 13%	627
September	1st to 10th	Night	9% 2 8% 34% 40% 7%	570
	11th to 20th	Night	12% 2 9% 28% 41% 8%	570
	21st to end	Night	11% 2 12% 34% 36% 5%	680
October	1st to 10th	Night	8% 2 19% 34% 33% 4	760
	11th to 20th	Night	11% 5% 25% 34% 21% 3	760
	21st to end	Night	14% 7% 23% 35% 19% 2	836
November	1st to 10th	Night	14% 5% 25% 34% 20% 2	780
	11th to 20th	Night	15% 9% 29% 33% 14%	800
	21st to end	Night	18% 10% 31% 27% 13% 1	800
December	1st to 10th	Night	21% 12% 28% 30% 9%	805
	11th to 20th	Night	23% 10% 30% 28% 9%	1000
	21st to end	Night	24% 13% 31% 26% 6%	1063

Page generated at 2024-12-21 03:13:51. Version ac07

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