Ladiesburg
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Ladiesburg clear sky chart from 2005-11-06 to 2024-12-02.

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	14% 6% 2 6% 4 4 5% 4 6% 8% 40%	101509
	Night	15% 7% 2 6% 4 4 4 4 6% 7% 41%	98092
Transparency	Day	41% 4 11% 25% 16% 3	105148
	Night	41% 3 11% 25% 17% 3	102592
Seeing	Day	17% 8% 25% 26% 17% 8%	15001
	Night	17% 7% 27% 34% 14% 1	24502

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% 3 5% 4 4 5% 4 5% 6% 43%	2549
	11th to 20th	Day	14% 10% 3 9% 6% 4 4 4 4 6% 36%	2840
	21st to end	Day	17% 10% 3 8% 5% 5% 4 4 5% 5% 34%	3124
February	1st to 10th	Day	14% 9% 3 7% 5% 4 5% 4 5% 6% 38%	1710
	11th to 20th	Day	15% 8% 3 6% 4 4 4 4 5% 6% 40%	1701
	21st to end	Day	18% 9% 3 7% 5% 4 4 3 4 5% 39%	1570
March	1st to 10th	Day	21% 6% 2 6% 5% 4 4 4 5% 7% 36%	3369
	11th to 20th	Day	10% 6% 3 6% 4 5% 4 5% 7% 7% 45%	3480
	21st to end	Day	19% 7% 2 7% 4 3 3 3 5% 5% 41%	3875
April	1st to 10th	Day	13% 8% 3 6% 5% 5% 5% 5% 6% 7% 38%	2280
	11th to 20th	Day	13% 7% 2 5% 4 4 4 3 5% 6% 45%	2254
	21st to end	Day	19% 6% 2 6% 4 3 4 4 5% 6% 41%	2280
May	1st to 10th	Day	25% 8% 2 6% 4 4 4 4 7% 8% 30%	4066
	11th to 20th	Day	23% 6% 3 6% 5% 5% 4 4 6% 8% 30%	4324
	21st to end	Day	10% 5% 2 6% 4 4 4 4 6% 10% 45%	4823
June	1st to 10th	Day	12% 5% 2 6% 4 4 4 4 7% 9% 42%	2660
	11th to 20th	Day	11% 6% 2 6% 5% 5% 5% 5% 7% 9% 40%	2660
	21st to end	Day	9% 4 2 5% 4 5% 5% 4 7% 11% 45%	2660
July	1st to 10th	Day	5% 4 2 6% 5% 6% 6% 5% 9% 10% 42%	4440
	11th to 20th	Day	8% 5% 2 5% 5% 5% 5% 5% 8% 10% 41%	4356
	21st to end	Day	10% 7% 3 8% 6% 5% 6% 4 7% 8% 37%	4466
August	1st to 10th	Day	15% 6% 2 7% 5% 5% 6% 5% 7% 8% 34%	4104
	11th to 20th	Day	10% 5% 2 6% 4 5% 6% 5% 7% 8% 41%	3897
	21st to end	Day	11% 6% 2 5% 3 4 5% 4 6% 9% 46%	4180
September	1st to 10th	Day	16% 6% 2 5% 3 4 3 4 5% 7% 46%	2280
	11th to 20th	Day	12% 5% 2 5% 4 4 5% 3 5% 8% 48%	2280
	21st to end	Day	20% 7% 2 6% 4 4 3 3 5% 7% 38%	1995
October	1st to 10th	Day	16% 6% 2 5% 4 4 4 3 5% 7% 45%	1900
	11th to 20th	Day	17% 4 2 5% 4 4 3 3 5% 6% 48%	1900
	21st to end	Day	13% 6% 2 6% 4 4 4 3 5% 6% 47%	2090
November	1st to 10th	Day	11% 5% 2 4 3 3 4 3 6% 7% 51%	1837
	11th to 20th	Day	14% 6% 2 5% 3 4 4 3 5% 7% 47%	1749
	21st to end	Day	16% 6% 2 5% 4 4 5% 3 5% 7% 44%	1600
December	1st to 10th	Day	17% 9% 2 6% 5% 4 4 4 6% 7% 37%	1528
	11th to 20th	Day	16% 6% 3 6% 5% 4 4 4 6% 6% 39%	1910
	21st to end	Day	17% 7% 3 7% 5% 5% 5% 4 7% 7% 33%	2772
January	1st to 10th	Night	13% 8% 3 7% 5% 5% 4 4 6% 6% 40%	4395
	11th to 20th	Night	18% 8% 2 6% 4 3 3 3 5% 6% 43%	4120
	21st to end	Night	20% 9% 3 6% 4 4 4 3 5% 6% 36%	4532
February	1st to 10th	Night	15% 7% 3 6% 4 4 5% 4 6% 7% 40%	2470
	11th to 20th	Night	17% 9% 2 7% 4 3 4 3 5% 6% 41%	2365
	21st to end	Night	17% 9% 2 6% 5% 3 4 4 5% 6% 38%	1884
March	1st to 10th	Night	20% 9% 3 5% 4 4 4 3 5% 6% 38%	3479
	11th to 20th	Night	11% 6% 2 5% 4 4 4 3 5% 6% 49%	3480
	21st to end	Night	13% 9% 3 6% 4 4 3 3 4 5% 47%	3755
April	1st to 10th	Night	15% 8% 3 6% 5% 4 4 5% 6% 6% 38%	1900
	11th to 20th	Night	12% 7% 3 6% 4 4 3 4 6% 7% 45%	1875
	21st to end	Night	18% 5% 1 4 3 4 4 4 6% 8% 42%	1900
May	1st to 10th	Night	25% 8% 3 6% 4 4 4 4 5% 8% 30%	2859
	11th to 20th	Night	23% 10% 4 7% 4 4 4 3 6% 7% 30%	2568
	21st to end	Night	10% 6% 2 6% 5% 4 5% 4 8% 10% 40%	2732
June	1st to 10th	Night	11% 4 2 6% 4 3 4 4 5% 10% 45%	1520
	11th to 20th	Night	10% 6% 3 6% 5% 5% 5% 5% 7% 8% 41%	1520
	21st to end	Night	8% 4 2 6% 6% 4 5% 5% 6% 9% 44%	1520
July	1st to 10th	Night	7% 4 2 8% 6% 6% 5% 5% 7% 10% 41%	2520
	11th to 20th	Night	6% 6% 3 8% 6% 5% 5% 5% 7% 10% 40%	2601
	21st to end	Night	11% 7% 3 7% 4 4 5% 5% 7% 8% 40%	3087
August	1st to 10th	Night	17% 6% 3 7% 4 5% 5% 4 7% 10% 33%	2825
	11th to 20th	Night	9% 6% 3 7% 5% 6% 6% 5% 6% 9% 39%	2899
	21st to end	Night	11% 5% 2 6% 4 4 4 3 5% 9% 46%	3476
September	1st to 10th	Night	14% 5% 2 5% 4 4 3 5% 5% 8% 46%	1900
	11th to 20th	Night	11% 6% 2 5% 3 3 3 3 5% 7% 53%	1900
	21st to end	Night	19% 6% 2 6% 3 4 5% 3 5% 6% 41%	2179
October	1st to 10th	Night	19% 7% 2 5% 3 4 4 3 5% 5% 44%	2280
	11th to 20th	Night	14% 5% 2 5% 3 3 3 3 4 6% 51%	2280
	21st to end	Night	17% 5% 2 4 3 3 4 2 5% 8% 48%	2508
November	1st to 10th	Night	11% 5% 2 4 3 3 4 2 4 6% 54%	2459
	11th to 20th	Night	14% 8% 2 5% 4 3 4 3 5% 6% 46%	2649
	21st to end	Night	13% 5% 2 6% 4 5% 4 3 6% 7% 44%	2800
December	1st to 10th	Night	16% 8% 3 6% 4 4 4 4 6% 6% 39%	2686
	11th to 20th	Night	17% 5% 2 6% 4 5% 5% 4 5% 6% 41%	3285
	21st to end	Night	16% 7% 2 6% 5% 5% 6% 4 8% 8% 33%	4884

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	42% 2 9% 30% 13% 4	2550
	11th to 20th	Day	51% 1 9% 20% 15% 4	2840
	21st to end	Day	53% 2 10% 23% 11% 2	3124
February	1st to 10th	Day	47% 4 11% 25% 11% 2	1710
	11th to 20th	Day	45% 4 8% 25% 15% 3	1710
	21st to end	Day	50% 2 10% 21% 14% 4	1570
March	1st to 10th	Day	50% 2 9% 24% 12% 3	3369
	11th to 20th	Day	38% 2 7% 30% 19% 4	3480
	21st to end	Day	47% 2 10% 22% 17% 3	3875
April	1st to 10th	Day	43% 3 12% 20% 17% 4	2280
	11th to 20th	Day	40% 3 11% 23% 19% 5%	2254
	21st to end	Day	44% 3 9% 22% 19% 3	2280
May	1st to 10th	Day	52% 3 11% 22% 10% 1	4104
	11th to 20th	Day	53% 3 12% 22% 9% 2	4328
	21st to end	Day	37% 3 14% 27% 17% 2	4837
June	1st to 10th	Day	37% 4 15% 26% 16% 2	2660
	11th to 20th	Day	39% 6% 13% 25% 15% 2	2660
	21st to end	Day	33% 5% 14% 29% 17% 2	2660
July	1st to 10th	Day	33% 8% 17% 24% 13% 5%	4370
	11th to 20th	Day	34% 7% 15% 30% 13% 2	4281
	21st to end	Day	44% 5% 10% 21% 18% 2	4324
August	1st to 10th	Day	45% 7% 13% 25% 9%	4091
	11th to 20th	Day	36% 6% 13% 27% 16% 1	3936
	21st to end	Day	34% 5% 13% 29% 18% 2	4180
September	1st to 10th	Day	39% 4 11% 21% 21% 4	2280
	11th to 20th	Day	35% 3 8% 28% 22% 4	2280
	21st to end	Day	47% 3 8% 20% 20% 2	1995
October	1st to 10th	Day	37% 3 8% 20% 27% 5%	3160
	11th to 20th	Day	28% 3 10% 28% 22% 8%	3140
	21st to end	Day	26% 3 10% 31% 28% 3	3428
November	1st to 10th	Day	33% 2 13% 26% 21% 5%	1837
	11th to 20th	Day	37% 2 11% 25% 21% 4	1749
	21st to end	Day	41% 3 10% 31% 13% 2	1600
December	1st to 10th	Day	47% 3 13% 25% 11% 1	1528
	11th to 20th	Day	44% 3 11% 31% 10% 2	1906
	21st to end	Day	50% 2 14% 22% 12% 1	2772
January	1st to 10th	Night	44% 2 8% 28% 15% 3	4395
	11th to 20th	Night	44% 2 10% 26% 16% 2	4120
	21st to end	Night	50% 1 7% 28% 12% 2	4532
February	1st to 10th	Night	42% 3 14% 26% 13% 2	2470
	11th to 20th	Night	45% 2 9% 23% 18% 3	2367
	21st to end	Night	47% 3 9% 22% 14% 5%	1884
March	1st to 10th	Night	48% 2 8% 30% 11% 2	3479
	11th to 20th	Night	37% 2 7% 33% 18% 3	3480
	21st to end	Night	41% 2 8% 23% 21% 5%	3755
April	1st to 10th	Night	45% 3 9% 21% 18% 4	1900
	11th to 20th	Night	38% 3 12% 22% 19% 6%	1875
	21st to end	Night	40% 3 10% 26% 16% 4	1900
May	1st to 10th	Night	54% 3 9% 19% 12% 3	2886
	11th to 20th	Night	55% 4 10% 20% 10% 1	2569
	21st to end	Night	39% 3 17% 27% 11% 2	2739
June	1st to 10th	Night	34% 6% 11% 27% 18% 3	1520
	11th to 20th	Night	40% 5% 13% 26% 15% 2	1520
	21st to end	Night	35% 5% 13% 26% 18% 2	1520
July	1st to 10th	Night	37% 8% 18% 19% 13% 5%	2480
	11th to 20th	Night	38% 8% 15% 24% 14% 2	2553
	21st to end	Night	39% 6% 14% 21% 18% 1	2988
August	1st to 10th	Night	46% 6% 17% 22% 8% 1	2814
	11th to 20th	Night	40% 7% 11% 27% 14% 1	2926
	21st to end	Night	34% 5% 13% 30% 16% 2	3476
September	1st to 10th	Night	37% 4 12% 21% 21% 5%	1900
	11th to 20th	Night	33% 4 9% 29% 24% 3	1900
	21st to end	Night	45% 4 8% 21% 19% 3	2179
October	1st to 10th	Night	41% 4 10% 21% 21% 3	3800
	11th to 20th	Night	25% 3 10% 26% 30% 6%	3779
	21st to end	Night	25% 3 11% 33% 25% 4	4120
November	1st to 10th	Night	33% 2 10% 28% 22% 5%	2459
	11th to 20th	Night	38% 3 8% 25% 21% 5%	2649
	21st to end	Night	39% 3 12% 25% 19% 3	2800
December	1st to 10th	Night	45% 4 12% 26% 12% 1	2686
	11th to 20th	Night	44% 3 11% 23% 17% 3	3288
	21st to end	Night	47% 2 15% 23% 12% 1	4884

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	20% 15% 37% 21% 6% 1	189
	11th to 20th	Day	23% 20% 33% 17% 6%	270
	21st to end	Day	19% 18% 39% 16% 8% 1	297
February	1st to 10th	Day	19% 14% 44% 18% 4	270
	11th to 20th	Day	25% 19% 37% 17% 2	308
	21st to end	Day	26% 13% 35% 20% 5% 1	382
March	1st to 10th	Day	17% 19% 30% 26% 7% 1	460
	11th to 20th	Day	20% 17% 33% 21% 8% 2	460
	21st to end	Day	22% 10% 34% 24% 9% 1	506
April	1st to 10th	Day	20% 13% 31% 25% 8% 3	460
	11th to 20th	Day	15% 12% 31% 20% 15% 6%	452
	21st to end	Day	23% 9% 28% 23% 12% 3	460
May	1st to 10th	Day	27% 6% 28% 23% 10% 5%	463
	11th to 20th	Day	21% 6% 26% 24% 15% 7%	487
	21st to end	Day	15% 3 19% 24% 28% 11%	529
June	1st to 10th	Day	13% 5% 24% 26% 20% 12%	490
	11th to 20th	Day	13% 5% 22% 27% 23% 9%	490
	21st to end	Day	10% 4 20% 34% 23% 9%	490
July	1st to 10th	Day	11% 1 13% 29% 30% 16%	485
	11th to 20th	Day	6% 2 12% 28% 34% 17%	484
	21st to end	Day	10% 3 14% 31% 31% 11%	532
August	1st to 10th	Day	11% 2 14% 25% 30% 18%	486
	11th to 20th	Day	10% 4 12% 31% 27% 16%	479
	21st to end	Day	10% 2 13% 29% 28% 18%	539
September	1st to 10th	Day	19% 3 16% 19% 26% 18%	490
	11th to 20th	Day	12% 3 13% 31% 24% 18%	490
	21st to end	Day	25% 6% 20% 25% 18% 6%	490
October	1st to 10th	Day	19% 6% 16% 27% 22% 10%	490
	11th to 20th	Day	17% 8% 24% 30% 17% 4	490
	21st to end	Day	14% 6% 32% 31% 13% 4	539
November	1st to 10th	Day	14% 7% 26% 34% 15% 3	435
	11th to 20th	Day	15% 10% 32% 28% 13% 1	349
	21st to end	Day	19% 12% 37% 20% 11% 2	200
December	1st to 10th	Day	26% 9% 32% 26% 3 3	182
	11th to 20th	Day	21% 12% 33% 23% 11% 1	180
	21st to end	Day	20% 11% 34% 25% 9% 1	198
January	1st to 10th	Night	19% 11% 39% 28% 3	760
	11th to 20th	Night	21% 11% 32% 32% 3	760
	21st to end	Night	18% 10% 40% 30% 2	836
February	1st to 10th	Night	19% 9% 36% 32% 2	760
	11th to 20th	Night	23% 13% 40% 22% 1	743
	21st to end	Night	25% 12% 37% 23% 3	628
March	1st to 10th	Night	18% 13% 37% 27% 5%	760
	11th to 20th	Night	22% 10% 35% 28% 5%	760
	21st to end	Night	17% 10% 39% 29% 4 1	836
April	1st to 10th	Night	19% 11% 36% 28% 6%	760
	11th to 20th	Night	15% 8% 34% 32% 11% 1	751
	21st to end	Night	21% 6% 31% 33% 9% 1	760
May	1st to 10th	Night	20% 7% 23% 37% 12%	603
	11th to 20th	Night	22% 4 21% 38% 13% 1	421
	21st to end	Night	15% 1 17% 41% 24% 2	411
June	1st to 10th	Night	13% 2 22% 37% 25% 1	380
	11th to 20th	Night	12% 2 16% 48% 20% 2	380
	21st to end	Night	9% 4 17% 49% 22%	380
July	1st to 10th	Night	11% 3 14% 39% 31% 3	370
	11th to 20th	Night	8% 2 10% 43% 34% 3	410
	21st to end	Night	9% 2 9% 48% 29% 3	624
August	1st to 10th	Night	12% 2 7% 44% 33% 2	567
	11th to 20th	Night	12% 3 11% 39% 32% 4	626
	21st to end	Night	14% 2 11% 39% 31% 4	836
September	1st to 10th	Night	17% 2 12% 37% 29% 4	760
	11th to 20th	Night	13% 4 11% 35% 34% 3	760
	21st to end	Night	23% 3 17% 36% 20% 1	760
October	1st to 10th	Night	21% 4 18% 33% 21% 4	760
	11th to 20th	Night	16% 6% 27% 36% 14% 1	760
	21st to end	Night	19% 6% 28% 35% 12%	836
November	1st to 10th	Night	13% 4 29% 42% 10% 1	780
	11th to 20th	Night	19% 8% 31% 33% 9%	800
	21st to end	Night	15% 9% 34% 34% 8%	800
December	1st to 10th	Night	21% 9% 38% 25% 7%	768
	11th to 20th	Night	18% 6% 39% 31% 6%	760
	21st to end	Night	20% 7% 33% 37% 3	836

Page generated at 2024-11-29 10:43:07. Version ac07

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