Abita Springs
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Abita Springs clear sky chart from 2005-11-06 to 2025-08-05.

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	11% 5% 2 6% 5% 5% 5% 4 6% 8% 41%	124521
	Night	12% 6% 2 6% 4 4 4 4 6% 8% 45%	123556
Transparency	Day	38% 6% 13% 19% 17% 7%	128219
	Night	36% 6% 13% 19% 18% 8%	127932
Seeing	Day	13% 8% 20% 25% 23% 11%	15685
	Night	13% 6% 20% 30% 23% 6%	25251

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	17% 5% 2 5% 4 4 4 3 5% 7% 45%	4077
	11th to 20th	Day	14% 6% 2 5% 4 4 3 2 3 5% 51%	4167
	21st to end	Day	22% 7% 3 6% 4 4 4 4 4 5% 36%	4972
February	1st to 10th	Day	17% 9% 3 6% 4 4 4 4 4 6% 39%	2000
	11th to 20th	Day	17% 7% 3 6% 3 3 3 4 5% 6% 43%	1948
	21st to end	Day	16% 8% 2 9% 5% 4 4 3 5% 6% 37%	1650
March	1st to 10th	Day	19% 8% 3 7% 4 3 4 4 5% 7% 36%	4664
	11th to 20th	Day	12% 6% 2 5% 4 4 4 4 6% 8% 45%	4980
	21st to end	Day	14% 7% 3 7% 5% 4 4 4 5% 6% 41%	5754
April	1st to 10th	Day	12% 6% 2 7% 5% 5% 6% 5% 6% 7% 39%	2400
	11th to 20th	Day	13% 5% 2 8% 4 4 4 4 5% 8% 41%	2374
	21st to end	Day	9% 5% 2 5% 5% 4 5% 5% 7% 8% 47%	2400
May	1st to 10th	Day	16% 6% 2 7% 4 5% 5% 4 6% 9% 34%	5405
	11th to 20th	Day	9% 5% 2 5% 4 4 5% 4 7% 9% 46%	5404
	21st to end	Day	7% 4 2 6% 5% 5% 5% 5% 8% 12% 42%	5932
June	1st to 10th	Day	9% 6% 2 7% 6% 7% 7% 5% 8% 11% 32%	2400
	11th to 20th	Day	5% 5% 2 7% 7% 7% 7% 6% 8% 12% 34%	2534
	21st to end	Day	7% 6% 2 7% 8% 7% 8% 7% 9% 11% 28%	2600
July	1st to 10th	Day	6% 5% 2 7% 6% 7% 8% 6% 9% 13% 31%	5900
	11th to 20th	Day	5% 4 2 7% 6% 7% 7% 5% 9% 13% 36%	5767
	21st to end	Day	7% 5% 2 7% 6% 7% 8% 7% 10% 13% 28%	5922
August	1st to 10th	Day	3 3 1 5% 4 5% 5% 5% 7% 10% 52%	3833
	11th to 20th	Day	5% 4 2 6% 5% 6% 6% 6% 9% 11% 39%	3729
	21st to end	Day	9% 6% 3 9% 7% 6% 7% 5% 7% 8% 32%	4180
September	1st to 10th	Day	11% 6% 3 7% 6% 6% 6% 5% 8% 10% 32%	2280
	11th to 20th	Day	10% 7% 2 7% 6% 5% 6% 5% 6% 8% 38%	2215
	21st to end	Day	8% 4 2 5% 5% 5% 5% 4 6% 7% 48%	2090
October	1st to 10th	Day	7% 4 2 5% 3 4 5% 4 6% 7% 54%	2023
	11th to 20th	Day	6% 4 1 5% 5% 3 4 4 5% 7% 56%	1900
	21st to end	Day	10% 4 1 6% 3 3 3 3 4 6% 58%	2090
November	1st to 10th	Day	8% 5% 2 5% 3 4 4 4 6% 6% 52%	1958
	11th to 20th	Day	11% 5% 2 4 3 3 3 3 5% 5% 55%	1892
	21st to end	Day	13% 6% 2 7% 4 3 4 3 6% 6% 46%	1800
December	1st to 10th	Day	19% 6% 2 6% 4 4 4 3 5% 5% 42%	2930
	11th to 20th	Day	10% 6% 2 6% 4 4 4 4 5% 6% 48%	3396
	21st to end	Day	18% 7% 2 6% 4 4 4 3 4 6% 43%	4955
January	1st to 10th	Night	18% 7% 2 4 3 3 3 3 4 5% 48%	5870
	11th to 20th	Night	20% 7% 2 4 3 2 3 2 4 5% 48%	5785
	21st to end	Night	23% 7% 2 5% 4 3 4 3 5% 6% 38%	5984
February	1st to 10th	Night	18% 6% 2 6% 4 3 4 3 4 6% 43%	2400
	11th to 20th	Night	20% 8% 2 6% 4 3 3 3 6% 6% 40%	2338
	21st to end	Night	20% 8% 3 7% 3 3 3 3 5% 7% 38%	1980
March	1st to 10th	Night	19% 9% 3 7% 4 3 4 3 5% 6% 38%	5217
	11th to 20th	Night	13% 6% 2 5% 4 3 4 3 5% 6% 49%	4980
	21st to end	Night	16% 6% 2 5% 4 3 4 3 5% 6% 46%	5174
April	1st to 10th	Night	15% 6% 2 6% 5% 3 3 3 5% 6% 45%	2000
	11th to 20th	Night	13% 6% 2 6% 3 4 4 4 4 6% 47%	1975
	21st to end	Night	7% 5% 2 4 3 3 4 3 5% 9% 55%	2000
May	1st to 10th	Night	16% 6% 2 7% 4 5% 4 3 5% 8% 39%	4490
	11th to 20th	Night	14% 6% 2 5% 4 4 4 4 5% 8% 46%	4489
	21st to end	Night	8% 5% 1 5% 4 4 5% 4 7% 12% 45%	4922
June	1st to 10th	Night	8% 6% 1 6% 4 5% 5% 5% 8% 11% 43%	2000
	11th to 20th	Night	3 4 2 5% 4 5% 7% 6% 8% 11% 45%	1857
	21st to end	Night	6% 5% 2 6% 6% 6% 6% 5% 8% 10% 40%	1800
July	1st to 10th	Night	4 3 2 7% 5% 5% 6% 6% 9% 12% 40%	4078
	11th to 20th	Night	4 3 1 5% 5% 5% 6% 5% 9% 13% 45%	4199
	21st to end	Night	5% 5% 2 7% 6% 6% 6% 6% 9% 14% 36%	4929
August	1st to 10th	Night	2 2 1 3 4 4 5% 4 8% 11% 57%	3184
	11th to 20th	Night	3 2 1 5% 4 5% 6% 5% 9% 15% 45%	3100
	21st to end	Night	6% 5% 2 7% 5% 6% 6% 5% 8% 10% 40%	3476
September	1st to 10th	Night	8% 5% 3 6% 5% 6% 5% 5% 7% 11% 39%	1900
	11th to 20th	Night	9% 6% 2 6% 4 4 5% 5% 7% 9% 43%	1944
	21st to end	Night	7% 5% 2 5% 4 3 4 4 6% 8% 53%	2090
October	1st to 10th	Night	7% 4 1 5% 3 4 3 3 4 7% 59%	2152
	11th to 20th	Night	6% 4 2 4 4 3 4 3 5% 6% 61%	2280
	21st to end	Night	11% 4 2 4 3 3 3 3 5% 6% 57%	2508
November	1st to 10th	Night	11% 5% 2 5% 3 3 4 2 4 6% 56%	2340
	11th to 20th	Night	12% 5% 2 4 3 3 4 3 4 6% 54%	2503
	21st to end	Night	12% 6% 3 5% 4 4 4 3 6% 7% 48%	2600
December	1st to 10th	Night	15% 7% 2 7% 5% 4 4 3 4 5% 44%	4250
	11th to 20th	Night	11% 7% 2 5% 4 4 4 4 5% 6% 48%	4778
	21st to end	Night	20% 9% 2 6% 3 4 3 2 3 4 43%	5984

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	39% 3 6% 19% 25% 8%	4078
	11th to 20th	Day	37% 3 4 15% 31% 10%	4167
	21st to end	Day	50% 3 7% 13% 16% 11%	4972
February	1st to 10th	Day	46% 4 8% 13% 20% 10%	2000
	11th to 20th	Day	41% 5% 9% 17% 19% 10%	1958
	21st to end	Day	46% 5% 8% 15% 18% 9%	1650
March	1st to 10th	Day	47% 5% 7% 17% 14% 10%	4664
	11th to 20th	Day	35% 7% 8% 15% 19% 16%	4980
	21st to end	Day	43% 5% 10% 16% 17% 8%	5756
April	1st to 10th	Day	40% 8% 9% 17% 18% 9%	2400
	11th to 20th	Day	40% 5% 8% 19% 19% 9%	2374
	21st to end	Day	32% 7% 10% 23% 22% 6%	2400
May	1st to 10th	Day	44% 8% 13% 22% 10% 3	5440
	11th to 20th	Day	32% 6% 16% 27% 19% 1	5408
	21st to end	Day	32% 7% 16% 31% 12% 2	5945
June	1st to 10th	Day	40% 12% 12% 24% 11% 1	2400
	11th to 20th	Day	36% 11% 15% 23% 13% 2	2534
	21st to end	Day	44% 11% 18% 19% 9%	2600
July	1st to 10th	Day	43% 7% 28% 19% 3	5836
	11th to 20th	Day	38% 9% 40% 11% 1	5698
	21st to end	Day	43% 11% 21% 22% 3	5752
August	1st to 10th	Day	25% 7% 15% 28% 24%	3821
	11th to 20th	Day	35% 7% 20% 27% 9% 1	3765
	21st to end	Day	47% 9% 13% 16% 13% 2	4179
September	1st to 10th	Day	41% 11% 17% 15% 12% 4	2280
	11th to 20th	Day	40% 9% 14% 16% 14% 7%	2215
	21st to end	Day	33% 7% 10% 22% 18% 9%	2090
October	1st to 10th	Day	26% 4 6% 12% 22% 30%	3361
	11th to 20th	Day	16% 4 4 20% 27% 29%	3140
	21st to end	Day	20% 3 5% 13% 41% 18%	3428
November	1st to 10th	Day	30% 5% 8% 20% 26% 11%	1958
	11th to 20th	Day	31% 4 6% 18% 28% 13%	1892
	21st to end	Day	37% 4 7% 20% 20% 12%	1800
December	1st to 10th	Day	45% 3 7% 15% 23% 7%	2930
	11th to 20th	Day	36% 4 9% 19% 22% 10%	3393
	21st to end	Day	43% 5% 6% 17% 25% 5%	4955
January	1st to 10th	Night	39% 3 6% 19% 25% 9%	5870
	11th to 20th	Night	40% 3 4 16% 27% 10%	5785
	21st to end	Night	48% 2 7% 13% 20% 10%	5984
February	1st to 10th	Night	43% 3 8% 17% 20% 9%	2400
	11th to 20th	Night	44% 4 6% 15% 19% 12%	2339
	21st to end	Night	44% 5% 10% 15% 14% 12%	1980
March	1st to 10th	Night	48% 4 8% 12% 18% 10%	5217
	11th to 20th	Night	36% 5% 9% 14% 21% 15%	4980
	21st to end	Night	38% 5% 10% 22% 17% 8%	5174
April	1st to 10th	Night	40% 6% 10% 16% 17% 11%	2000
	11th to 20th	Night	38% 5% 9% 21% 18% 10%	1975
	21st to end	Night	27% 5% 13% 23% 24% 8%	2000
May	1st to 10th	Night	42% 7% 14% 21% 13% 3	4520
	11th to 20th	Night	37% 5% 16% 26% 16% 1	4490
	21st to end	Night	31% 7% 20% 31% 10% 1	4931
June	1st to 10th	Night	32% 9% 19% 28% 11% 1	2000
	11th to 20th	Night	28% 11% 21% 28% 10% 1	1857
	21st to end	Night	35% 11% 24% 21% 10%	1800
July	1st to 10th	Night	34% 9% 33% 19% 4	4035
	11th to 20th	Night	29% 14% 45% 10% 1	4148
	21st to end	Night	37% 13% 21% 26% 2	4785
August	1st to 10th	Night	20% 7% 22% 27% 24% 1	3172
	11th to 20th	Night	26% 11% 27% 28% 8%	3130
	21st to end	Night	37% 11% 19% 19% 11% 4	3476
September	1st to 10th	Night	37% 10% 20% 17% 11% 5%	1900
	11th to 20th	Night	35% 8% 17% 18% 14% 8%	1944
	21st to end	Night	29% 6% 13% 26% 17% 10%	2090
October	1st to 10th	Night	30% 3 7% 13% 23% 25%	3594
	11th to 20th	Night	16% 3 5% 20% 28% 28%	3779
	21st to end	Night	19% 2 6% 11% 39% 24%	4120
November	1st to 10th	Night	31% 3 8% 20% 24% 14%	2340
	11th to 20th	Night	31% 3 7% 16% 27% 15%	2503
	21st to end	Night	36% 4 6% 20% 21% 13%	2600
December	1st to 10th	Night	43% 3 6% 17% 24% 7%	4250
	11th to 20th	Night	37% 3 11% 18% 20% 11%	4780
	21st to end	Night	46% 3 6% 16% 22% 7%	5984

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	23% 14% 39% 17% 6% 1	300
	11th to 20th	Day	22% 18% 34% 21% 5% 1	300
	21st to end	Day	22% 21% 41% 13% 3	330
February	1st to 10th	Day	25% 19% 33% 16% 5% 1	300
	11th to 20th	Day	28% 19% 32% 17% 4	300
	21st to end	Day	16% 26% 42% 13% 2	249
March	1st to 10th	Day	19% 18% 39% 20% 4	300
	11th to 20th	Day	19% 25% 33% 19% 3	300
	21st to end	Day	19% 16% 33% 23% 8% 1	454
April	1st to 10th	Day	18% 15% 34% 23% 10% 1	500
	11th to 20th	Day	16% 16% 31% 24% 10% 2	492
	21st to end	Day	10% 9% 29% 31% 16% 4	500
May	1st to 10th	Day	15% 8% 30% 27% 18% 3	503
	11th to 20th	Day	12% 6% 21% 32% 21% 8%	527
	21st to end	Day	6% 4 17% 36% 25% 12%	573
June	1st to 10th	Day	11% 2 12% 32% 27% 15%	530
	11th to 20th	Day	7% 3 13% 31% 33% 14%	664
	21st to end	Day	9% 2 9% 29% 31% 20%	730
July	1st to 10th	Day	8% 2 7% 26% 35% 22%	721
	11th to 20th	Day	6% 1 5% 20% 42% 27%	663
	21st to end	Day	10% 1 4 18% 43% 24%	576
August	1st to 10th	Day	4 1 5% 22% 38% 30%	502
	11th to 20th	Day	7% 1 4 18% 38% 31%	479
	21st to end	Day	12% 2 7% 22% 34% 24%	539
September	1st to 10th	Day	10% 3 6% 23% 39% 19%	490
	11th to 20th	Day	10% 4 10% 24% 35% 16%	490
	21st to end	Day	8% 3 11% 29% 36% 13%	490
October	1st to 10th	Day	7% 4 18% 40% 24% 6%	423
	11th to 20th	Day	6% 7% 24% 36% 23% 5%	300
	21st to end	Day	16% 9% 19% 36% 15% 5%	330
November	1st to 10th	Day	14% 7% 24% 36% 17% 2	300
	11th to 20th	Day	16% 14% 30% 26% 13% 1	300
	21st to end	Day	14% 14% 36% 25% 9% 2	300
December	1st to 10th	Day	20% 11% 32% 24% 11% 2	300
	11th to 20th	Day	20% 14% 38% 22% 5% 1	300
	21st to end	Day	25% 12% 32% 22% 8% 1	330
January	1st to 10th	Night	20% 10% 33% 31% 6% 1	995
	11th to 20th	Night	21% 11% 30% 31% 8% 1	950
	21st to end	Night	22% 11% 32% 30% 5%	880
February	1st to 10th	Night	20% 10% 36% 29% 6%	800
	11th to 20th	Night	24% 12% 29% 28% 6%	783
	21st to end	Night	23% 14% 36% 25% 3	660
March	1st to 10th	Night	16% 13% 35% 29% 7%	735
	11th to 20th	Night	14% 9% 31% 35% 11% 1	600
	21st to end	Night	15% 10% 30% 34% 10%	660
April	1st to 10th	Night	17% 11% 28% 32% 12%	600
	11th to 20th	Night	14% 10% 30% 32% 14% 1	593
	21st to end	Night	10% 4 25% 42% 18% 1	600
May	1st to 10th	Night	12% 4 22% 42% 20% 1	600
	11th to 20th	Night	8% 4 19% 41% 25% 4	591
	21st to end	Night	7% 1 14% 37% 34% 7%	650
June	1st to 10th	Night	8% 2 8% 36% 38% 8%	600
	11th to 20th	Night	3 2 7% 29% 48% 12%	600
	21st to end	Night	7% 1 7% 26% 43% 16%	600
July	1st to 10th	Night	6% 1 2 17% 52% 21%	585
	11th to 20th	Night	5% 1 2 12% 48% 32%	582
	21st to end	Night	5% 1 3 15% 53% 23%	657
August	1st to 10th	Night	3 1 17% 49% 28%	579
	11th to 20th	Night	4 3 13% 50% 29%	564
	21st to end	Night	8% 1 6% 19% 43% 23%	627
September	1st to 10th	Night	10% 1 6% 20% 45% 18%	570
	11th to 20th	Night	10% 3 7% 25% 44% 11%	614
	21st to end	Night	10% 1 9% 32% 40% 7%	760
October	1st to 10th	Night	8% 2 16% 37% 32% 5%	760
	11th to 20th	Night	7% 5% 19% 39% 26% 3	760
	21st to end	Night	12% 7% 18% 37% 23% 3	836
November	1st to 10th	Night	14% 5% 16% 43% 20% 2	780
	11th to 20th	Night	14% 8% 26% 36% 16% 1	800
	21st to end	Night	14% 8% 27% 33% 17% 1	800
December	1st to 10th	Night	17% 10% 28% 30% 15% 1	800
	11th to 20th	Night	18% 8% 30% 34% 10% 1	800
	21st to end	Night	24% 11% 29% 29% 7%	880

Page generated at 2025-08-02 00:32:27. Version ac07

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