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 2024-11-04.

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% 6% 2 6% 5% 5% 5% 5% 7% 8% 39%	100230
	Night	12% 6% 2 6% 4 4 4 4 6% 8% 45%	98724
Transparency	Day	38% 7% 12% 18% 17% 7%	103964
	Night	35% 6% 13% 19% 18% 9%	103129
Seeing	Day	13% 8% 20% 25% 23% 11%	14697
	Night	13% 6% 20% 30% 24% 6%	24291

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% 6% 2 5% 5% 4 4 4 6% 7% 41%	2847
	11th to 20th	Day	13% 5% 2 5% 4 4 3 2 3 5% 55%	2911
	21st to end	Day	24% 7% 3 5% 4 4 4 3 4 5% 37%	3476
February	1st to 10th	Day	17% 9% 2 6% 4 4 4 4 4 6% 39%	1900
	11th to 20th	Day	17% 7% 2 6% 3 3 3 4 5% 6% 43%	1848
	21st to end	Day	16% 8% 3 9% 5% 4 4 3 5% 6% 38%	1570
March	1st to 10th	Day	23% 9% 3 7% 4 4 4 4 6% 7% 30%	3248
	11th to 20th	Day	14% 8% 3 7% 5% 5% 5% 5% 7% 9% 34%	3480
	21st to end	Day	11% 6% 3 7% 5% 4 5% 4 6% 7% 41%	4022
April	1st to 10th	Day	11% 5% 2 7% 5% 5% 6% 5% 7% 7% 40%	2280
	11th to 20th	Day	14% 5% 3 8% 4 4 4 5% 5% 8% 40%	2254
	21st to end	Day	9% 5% 2 5% 5% 4 4 4 7% 8% 47%	2280
May	1st to 10th	Day	11% 5% 2 7% 5% 5% 6% 5% 7% 9% 37%	3765
	11th to 20th	Day	13% 6% 2 6% 5% 4 5% 4 6% 8% 41%	3764
	21st to end	Day	5% 4 2 6% 5% 5% 5% 5% 8% 11% 45%	4129
June	1st to 10th	Day	9% 6% 2 7% 6% 7% 7% 5% 8% 11% 31%	2280
	11th to 20th	Day	5% 5% 2 7% 7% 7% 7% 6% 8% 12% 34%	2407
	21st to end	Day	7% 6% 3 7% 8% 7% 8% 7% 9% 10% 27%	2470
July	1st to 10th	Day	7% 6% 3 8% 7% 8% 8% 7% 9% 13% 24%	4120
	11th to 20th	Day	6% 5% 3 7% 7% 8% 8% 6% 9% 12% 30%	4029
	21st to end	Day	8% 6% 3 9% 7% 8% 8% 7% 9% 13% 22%	4118
August	1st to 10th	Day	3 3 1 5% 4 4 5% 5% 6% 10% 53%	3785
	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% 54%	1888
	11th to 20th	Day	11% 5% 2 4 3 3 3 3 5% 5% 55%	1798
	21st to end	Day	13% 6% 2 7% 4 3 4 3 6% 6% 45%	1710
December	1st to 10th	Day	15% 7% 2 6% 4 4 4 4 5% 6% 43%	1710
	11th to 20th	Day	15% 9% 3 7% 4 4 4 4 5% 6% 39%	2162
	21st to end	Day	18% 8% 2 6% 4 5% 5% 3 5% 6% 38%	3472
January	1st to 10th	Night	17% 8% 2 4 3 3 4 3 5% 6% 47%	4090
	11th to 20th	Night	16% 5% 2 4 3 2 3 2 4 5% 53%	4047
	21st to end	Night	26% 7% 2 4 3 2 3 2 4 6% 40%	4180
February	1st to 10th	Night	18% 6% 2 6% 4 3 4 3 5% 6% 43%	2280
	11th to 20th	Night	19% 8% 2 6% 4 3 3 3 6% 6% 42%	2218
	21st to end	Night	19% 8% 2 7% 3 3 3 3 5% 7% 38%	1884
March	1st to 10th	Night	23% 12% 3 7% 4 3 4 3 4 6% 30%	3619
	11th to 20th	Night	15% 7% 3 7% 5% 4 5% 4 6% 7% 37%	3480
	21st to end	Night	14% 6% 2 6% 4 3 4 4 6% 6% 45%	3608
April	1st to 10th	Night	14% 6% 2 6% 5% 3 3 3 5% 6% 46%	1900
	11th to 20th	Night	13% 7% 2 6% 4 4 4 4 4 6% 45%	1875
	21st to end	Night	7% 5% 2 4 3 3 4 3 5% 8% 56%	1900
May	1st to 10th	Night	12% 6% 2 7% 4 4 4 3 5% 8% 45%	3130
	11th to 20th	Night	15% 7% 3 6% 4 4 4 3 5% 6% 43%	3129
	21st to end	Night	7% 4 1 4 4 4 5% 5% 8% 12% 47%	3426
June	1st to 10th	Night	8% 6% 2 6% 4 5% 4 5% 8% 11% 42%	1900
	11th to 20th	Night	3 4 2 5% 4 5% 6% 6% 8% 11% 46%	1764
	21st to end	Night	6% 5% 2 6% 6% 6% 6% 5% 8% 10% 40%	1710
July	1st to 10th	Night	5% 4 2 8% 5% 5% 6% 6% 9% 12% 37%	2850
	11th to 20th	Night	3 3 1 5% 5% 5% 6% 6% 10% 13% 42%	2933
	21st to end	Night	6% 5% 2 7% 6% 6% 6% 6% 9% 14% 31%	3435
August	1st to 10th	Night	2 2 1 3 3 4 4 4 8% 11% 57%	3144
	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 4 3 2 4 2 4 6% 58%	2263
	11th to 20th	Night	11% 5% 1 4 4 3 4 3 4 6% 55%	2377
	21st to end	Night	12% 6% 3 5% 4 4 4 3 6% 7% 47%	2470
December	1st to 10th	Night	15% 7% 2 6% 4 3 3 3 4 7% 45%	2470
	11th to 20th	Night	13% 8% 2 6% 5% 4 5% 4 5% 5% 42%	3012
	21st to end	Night	18% 10% 2 7% 4 4 4 3 4 5% 40%	4180

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	40% 4 7% 16% 23% 10%	2848
	11th to 20th	Day	32% 5% 5% 16% 33% 9%	2911
	21st to end	Day	49% 4 5% 14% 19% 9%	3476
February	1st to 10th	Day	46% 4 8% 13% 19% 10%	1900
	11th to 20th	Day	41% 5% 8% 17% 19% 11%	1858
	21st to end	Day	46% 5% 8% 15% 17% 9%	1570
March	1st to 10th	Day	51% 7% 9% 17% 11% 4	3248
	11th to 20th	Day	42% 9% 10% 17% 17% 5%	3480
	21st to end	Day	39% 8% 11% 14% 20% 8%	4022
April	1st to 10th	Day	39% 8% 10% 17% 18% 9%	2280
	11th to 20th	Day	42% 6% 8% 19% 18% 8%	2254
	21st to end	Day	32% 7% 9% 22% 23% 6%	2280
May	1st to 10th	Day	37% 11% 14% 21% 12% 4	3800
	11th to 20th	Day	37% 9% 11% 19% 23% 2	3768
	21st to end	Day	28% 10% 16% 34% 11% 2	4141
June	1st to 10th	Day	41% 12% 12% 23% 10% 1	2280
	11th to 20th	Day	36% 11% 14% 24% 13% 2	2407
	21st to end	Day	44% 12% 16% 19% 9%	2470
July	1st to 10th	Day	47% 9% 23% 18% 2	4056
	11th to 20th	Day	43% 10% 35% 10% 2 1	3960
	21st to end	Day	48% 13% 19% 16% 3	3987
August	1st to 10th	Day	25% 7% 15% 28% 24%	3773
	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	29% 5% 8% 20% 26% 12%	1888
	11th to 20th	Day	30% 4 6% 19% 28% 12%	1798
	21st to end	Day	38% 5% 7% 19% 20% 11%	1710
December	1st to 10th	Day	40% 5% 9% 19% 18% 8%	1710
	11th to 20th	Day	44% 5% 7% 14% 22% 8%	2159
	21st to end	Day	45% 6% 8% 16% 21% 4	3472
January	1st to 10th	Night	39% 4 7% 15% 24% 11%	4090
	11th to 20th	Night	34% 4 5% 18% 27% 12%	4047
	21st to end	Night	46% 2 5% 15% 23% 8%	4180
February	1st to 10th	Night	43% 3 9% 18% 19% 9%	2280
	11th to 20th	Night	43% 5% 6% 15% 20% 12%	2219
	21st to end	Night	44% 6% 10% 15% 13% 12%	1884
March	1st to 10th	Night	54% 6% 9% 13% 12% 6%	3619
	11th to 20th	Night	43% 7% 11% 15% 17% 6%	3480
	21st to end	Night	37% 7% 10% 21% 19% 7%	3608
April	1st to 10th	Night	39% 6% 10% 17% 17% 11%	1900
	11th to 20th	Night	39% 5% 9% 21% 17% 9%	1875
	21st to end	Night	26% 5% 12% 23% 26% 8%	1900
May	1st to 10th	Night	35% 9% 14% 22% 16% 4	3160
	11th to 20th	Night	39% 7% 13% 21% 18% 2	3130
	21st to end	Night	26% 9% 22% 30% 12% 2	3435
June	1st to 10th	Night	32% 10% 19% 28% 10% 1	1900
	11th to 20th	Night	27% 11% 21% 29% 10% 1	1764
	21st to end	Night	35% 11% 23% 22% 10%	1710
July	1st to 10th	Night	36% 10% 34% 16% 3	2805
	11th to 20th	Night	29% 14% 44% 10% 2	2879
	21st to end	Night	40% 16% 21% 19% 3	3325
August	1st to 10th	Night	19% 7% 21% 27% 24% 1	3132
	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	30% 3 8% 20% 25% 14%	2263
	11th to 20th	Night	31% 4 7% 17% 28% 15%	2377
	21st to end	Night	36% 4 6% 20% 20% 13%	2470
December	1st to 10th	Night	39% 4 9% 21% 20% 7%	2470
	11th to 20th	Night	42% 5% 8% 13% 19% 14%	3014
	21st to end	Night	47% 5% 7% 17% 19% 6%	4180

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% 13% 39% 19% 6% 1	270
	11th to 20th	Day	21% 16% 34% 23% 6% 1	270
	21st to end	Day	22% 22% 41% 13% 3	297
February	1st to 10th	Day	26% 21% 32% 16% 4 1	270
	11th to 20th	Day	28% 18% 32% 18% 4	270
	21st to end	Day	16% 28% 41% 14% 1	225
March	1st to 10th	Day	16% 20% 38% 21% 4	270
	11th to 20th	Day	18% 24% 34% 21% 3	270
	21st to end	Day	18% 16% 34% 23% 8% 1	415
April	1st to 10th	Day	17% 15% 33% 25% 10% 1	460
	11th to 20th	Day	17% 16% 30% 24% 10% 2	452
	21st to end	Day	11% 9% 30% 31% 16% 3	460
May	1st to 10th	Day	13% 8% 30% 28% 19% 3	463
	11th to 20th	Day	12% 6% 18% 32% 23% 9%	487
	21st to end	Day	6% 3 15% 36% 27% 13%	529
June	1st to 10th	Day	12% 2 11% 31% 27% 16%	490
	11th to 20th	Day	7% 3 12% 30% 34% 14%	617
	21st to end	Day	9% 2 10% 28% 31% 20%	680
July	1st to 10th	Day	8% 2 7% 24% 35% 23%	671
	11th to 20th	Day	7% 5% 18% 43% 27%	616
	21st to end	Day	10% 1 4 17% 42% 25%	532
August	1st to 10th	Day	4 1 5% 22% 38% 30%	486
	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% 5% 23% 38% 19% 2	279
	11th to 20th	Day	16% 14% 29% 26% 14% 1	270
	21st to end	Day	15% 13% 36% 25% 9% 2	270
December	1st to 10th	Day	19% 10% 30% 26% 12% 2	270
	11th to 20th	Day	23% 15% 36% 22% 4	270
	21st to end	Day	27% 12% 31% 21% 8% 1	297
January	1st to 10th	Night	20% 10% 31% 32% 6% 1	945
	11th to 20th	Night	20% 10% 30% 32% 8% 1	903
	21st to end	Night	22% 11% 31% 30% 5%	836
February	1st to 10th	Night	20% 10% 36% 29% 6%	760
	11th to 20th	Night	23% 11% 30% 29% 7%	743
	21st to end	Night	22% 15% 35% 26% 2	628
March	1st to 10th	Night	17% 12% 35% 29% 8%	698
	11th to 20th	Night	14% 8% 30% 36% 11% 1	570
	21st to end	Night	15% 10% 30% 34% 11%	627
April	1st to 10th	Night	16% 11% 29% 32% 13%	570
	11th to 20th	Night	14% 10% 29% 32% 14% 1	563
	21st to end	Night	10% 5% 25% 42% 17% 1	570
May	1st to 10th	Night	10% 4 22% 41% 21% 1	570
	11th to 20th	Night	8% 4 17% 41% 26% 4	561
	21st to end	Night	6% 1 14% 37% 35% 7%	617
June	1st to 10th	Night	9% 2 7% 35% 39% 9%	570
	11th to 20th	Night	3 2 7% 29% 47% 12%	570
	21st to end	Night	7% 1 7% 27% 41% 17%	570
July	1st to 10th	Night	7% 1 3 17% 52% 21%	555
	11th to 20th	Night	5% 1 2 12% 49% 31%	552
	21st to end	Night	5% 1 4 15% 54% 22%	624
August	1st to 10th	Night	4 1 18% 49% 28%	567
	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% 15% 44% 21% 2	755
	11th to 20th	Night	14% 8% 26% 36% 16% 1	760
	21st to end	Night	14% 8% 27% 33% 16% 1	760
December	1st to 10th	Night	17% 10% 27% 30% 16% 1	760
	11th to 20th	Night	18% 8% 30% 34% 9% 1	760
	21st to end	Night	24% 11% 28% 29% 7%	836

Page generated at 2024-11-01 21:47:52. Version ac07

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