Lagniappe Farm
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lagniappe Farm clear sky chart from 2005-11-06 to 2026-03-03.

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	13% 6% 2 6% 4 4 5% 4 6% 8% 42%	130945
	Night	14% 6% 2 6% 4 4 4 4 5% 7% 44%	130217
Transparency	Day	38% 7% 12% 22% 17% 5%	134549
	Night	38% 6% 11% 22% 18% 5%	134683
Seeing	Day	19% 11% 27% 25% 14% 5%	16671
	Night	17% 8% 29% 32% 13% 1	26476

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	15% 5% 2 5% 3 5% 4 3 5% 5% 47%	5230
	11th to 20th	Day	12% 8% 2 5% 3 3 3 3 3 4 53%	5280
	21st to end	Day	14% 6% 3 6% 4 4 4 3 4 6% 46%	5780
February	1st to 10th	Day	12% 7% 3 7% 5% 4 4 3 6% 6% 43%	1890
	11th to 20th	Day	19% 7% 3 6% 3 4 3 4 4 6% 41%	1853
	21st to end	Day	18% 8% 3 6% 4 4 4 3 5% 7% 38%	1782
March	1st to 10th	Day	17% 6% 2 6% 5% 4 4 3 6% 7% 41%	4957
	11th to 20th	Day	10% 6% 2 5% 3 4 4 3 4 7% 52%	4980
	21st to end	Day	16% 6% 3 6% 5% 4 5% 4 5% 6% 41%	5465
April	1st to 10th	Day	13% 6% 1 5% 4 4 4 4 6% 7% 47%	2380
	11th to 20th	Day	12% 6% 2 5% 4 4 3 3 5% 7% 48%	2374
	21st to end	Day	16% 7% 2 6% 5% 4 4 4 5% 7% 41%	2410
May	1st to 10th	Day	15% 7% 2 6% 5% 5% 6% 5% 7% 10% 33%	5862
	11th to 20th	Day	22% 6% 2 6% 4 4 5% 4 6% 9% 32%	5861
	21st to end	Day	16% 4 2 6% 4 4 5% 4 7% 10% 39%	6885
June	1st to 10th	Day	11% 4 2 4 6% 5% 5% 4 7% 9% 42%	2800
	11th to 20th	Day	11% 5% 2 6% 5% 4 5% 5% 7% 9% 41%	2800
	21st to end	Day	9% 4 2 5% 4 5% 5% 5% 7% 9% 46%	2800
July	1st to 10th	Day	7% 4 2 6% 5% 5% 6% 5% 7% 11% 43%	6188
	11th to 20th	Day	8% 6% 2 7% 6% 6% 7% 7% 9% 13% 29%	5900
	21st to end	Day	9% 5% 2 6% 6% 5% 6% 5% 7% 10% 38%	6424
August	1st to 10th	Day	14% 6% 2 6% 5% 5% 6% 5% 7% 11% 33%	4234
	11th to 20th	Day	9% 5% 2 7% 5% 6% 6% 5% 8% 10% 38%	4059
	21st to end	Day	10% 4 2 5% 3 5% 4 4 6% 9% 49%	4312
September	1st to 10th	Day	12% 5% 2 6% 4 4 4 3 5% 7% 47%	2400
	11th to 20th	Day	13% 5% 2 6% 3 4 4 3 6% 8% 46%	2348
	21st to end	Day	22% 7% 2 6% 4 3 5% 4 5% 5% 36%	2115
October	1st to 10th	Day	14% 6% 2 5% 3 4 3 4 4 6% 49%	2000
	11th to 20th	Day	16% 4 2 4 3 3 4 3 3 6% 52%	2000
	21st to end	Day	13% 5% 2 5% 4 3 4 3 4 5% 53%	2200
November	1st to 10th	Day	11% 6% 1 5% 4 3 3 3 5% 6% 54%	2057
	11th to 20th	Day	14% 5% 2 5% 3 3 4 4 5% 6% 51%	1841
	21st to end	Day	14% 6% 1 5% 4 4 2 3 5% 6% 51%	1680
December	1st to 10th	Day	11% 5% 2 6% 3 4 4 4 5% 5% 51%	2680
	11th to 20th	Day	19% 7% 3 4 3 2 3 3 4 6% 47%	3070
	21st to end	Day	19% 7% 3 6% 4 4 4 3 5% 6% 39%	4048
January	1st to 10th	Night	11% 6% 2 4 3 4 5% 4 5% 5% 50%	7658
	11th to 20th	Night	13% 6% 2 5% 3 3 3 3 4 5% 55%	7680
	21st to end	Night	13% 6% 2 5% 3 3 3 2 4 5% 51%	8401
February	1st to 10th	Night	14% 7% 2 6% 4 5% 5% 4 6% 7% 42%	2730
	11th to 20th	Night	20% 7% 2 6% 4 3 3 3 4 5% 42%	2652
	21st to end	Night	15% 7% 3 5% 4 4 3 4 6% 5% 44%	2020
March	1st to 10th	Night	16% 6% 2 5% 4 3 4 3 4 6% 48%	4941
	11th to 20th	Night	11% 6% 2 4 3 3 4 3 5% 7% 53%	4980
	21st to end	Night	12% 6% 2 6% 4 4 4 4 5% 6% 46%	5467
April	1st to 10th	Night	15% 8% 2 5% 4 4 4 3 5% 7% 44%	2020
	11th to 20th	Night	11% 5% 2 5% 4 4 4 4 5% 8% 48%	1975
	21st to end	Night	15% 5% 2 5% 3 4 4 4 5% 8% 46%	2000
May	1st to 10th	Night	19% 9% 3 7% 5% 4 4 4 5% 8% 32%	4041
	11th to 20th	Night	24% 6% 2 6% 5% 5% 4 4 6% 7% 31%	4032
	21st to end	Night	16% 7% 2 7% 5% 5% 4 3 6% 9% 37%	3966
June	1st to 10th	Night	11% 5% 2 5% 4 4 4 4 8% 10% 44%	1600
	11th to 20th	Night	12% 5% 2 5% 5% 6% 6% 4 6% 9% 41%	1600
	21st to end	Night	9% 4 2 5% 5% 4 6% 5% 7% 9% 44%	1600
July	1st to 10th	Night	9% 5% 2 7% 5% 5% 6% 5% 7% 10% 39%	3751
	11th to 20th	Night	11% 8% 4 10% 6% 6% 7% 5% 8% 9% 27%	4057
	21st to end	Night	7% 6% 3 7% 6% 6% 7% 5% 8% 10% 35%	4427
August	1st to 10th	Night	15% 6% 2 7% 6% 6% 4 4 7% 9% 33%	2915
	11th to 20th	Night	11% 8% 3 8% 5% 5% 5% 5% 6% 8% 36%	2955
	21st to end	Night	11% 6% 2 6% 5% 4 4 4 6% 8% 44%	3586
September	1st to 10th	Night	14% 5% 2 5% 3 5% 4 3 5% 7% 47%	2000
	11th to 20th	Night	11% 7% 3 6% 4 4 4 4 5% 6% 47%	2049
	21st to end	Night	23% 7% 2 5% 4 4 4 3 5% 6% 38%	2285
October	1st to 10th	Night	18% 6% 2 5% 4 3 3 3 4 5% 47%	2400
	11th to 20th	Night	16% 5% 2 3 3 3 4 3 5% 6% 50%	2400
	21st to end	Night	14% 5% 2 4 4 3 3 3 5% 6% 52%	2640
November	1st to 10th	Night	12% 6% 2 5% 3 3 3 3 4 5% 53%	2461
	11th to 20th	Night	14% 6% 2 5% 4 3 3 3 4 6% 49%	2773
	21st to end	Night	13% 4 1 5% 3 4 3 3 4 7% 51%	2940
December	1st to 10th	Night	10% 5% 2 5% 4 3 3 3 5% 8% 52%	4720
	11th to 20th	Night	19% 7% 2 5% 4 3 4 3 4 5% 44%	5345
	21st to end	Night	17% 6% 2 5% 3 4 5% 4 6% 7% 42%	7150

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	38% 3 10% 23% 18% 7%	5231
	11th to 20th	Day	35% 4 5% 19% 23% 14%	5280
	21st to end	Day	40% 4 7% 28% 17% 4	5780
February	1st to 10th	Day	40% 6% 11% 25% 15% 3	1890
	11th to 20th	Day	44% 4 8% 21% 19% 4	1862
	21st to end	Day	45% 6% 11% 17% 16% 5%	1782
March	1st to 10th	Day	40% 6% 8% 19% 17% 10%	4957
	11th to 20th	Day	31% 6% 8% 25% 22% 9%	4980
	21st to end	Day	43% 6% 10% 16% 17% 7%	5465
April	1st to 10th	Day	35% 6% 12% 21% 18% 8%	2380
	11th to 20th	Day	35% 6% 12% 20% 22% 6%	2374
	21st to end	Day	41% 7% 11% 23% 14% 4	2410
May	1st to 10th	Day	43% 10% 16% 19% 12% 1	5897
	11th to 20th	Day	47% 9% 13% 19% 12% 1	5865
	21st to end	Day	37% 9% 14% 20% 18% 2	6900
June	1st to 10th	Day	35% 9% 15% 25% 15% 1	2800
	11th to 20th	Day	38% 10% 15% 21% 15% 2	2800
	21st to end	Day	32% 9% 17% 25% 16% 2	2800
July	1st to 10th	Day	34% 9% 20% 20% 13% 4	6121
	11th to 20th	Day	41% 11% 20% 21% 6% 1	5831
	21st to end	Day	38% 8% 14% 23% 17%	6240
August	1st to 10th	Day	43% 8% 18% 25% 6%	4221
	11th to 20th	Day	38% 8% 15% 24% 14%	4098
	21st to end	Day	32% 6% 18% 28% 15% 2	4312
September	1st to 10th	Day	36% 8% 13% 18% 21% 5%	2400
	11th to 20th	Day	35% 7% 10% 26% 19% 4	2348
	21st to end	Day	48% 7% 10% 18% 14% 3	2115
October	1st to 10th	Day	35% 4 7% 19% 30% 5%	3260
	11th to 20th	Day	25% 4 7% 23% 29% 11%	3240
	21st to end	Day	21% 3 10% 29% 23% 13%	3538
November	1st to 10th	Day	31% 5% 10% 24% 26% 5%	2057
	11th to 20th	Day	33% 5% 10% 22% 23% 7%	1841
	21st to end	Day	35% 5% 9% 25% 22% 3	1680
December	1st to 10th	Day	35% 5% 10% 25% 18% 8%	2680
	11th to 20th	Day	40% 3 13% 25% 15% 5%	3066
	21st to end	Day	44% 6% 13% 21% 15% 1	4048
January	1st to 10th	Night	34% 4 10% 23% 22% 7%	7659
	11th to 20th	Night	34% 3 5% 21% 26% 12%	7680
	21st to end	Night	36% 3 7% 28% 21% 5%	8401
February	1st to 10th	Night	40% 6% 11% 23% 17% 3	2730
	11th to 20th	Night	44% 4 8% 20% 18% 6%	2654
	21st to end	Night	40% 5% 10% 20% 17% 7%	2020
March	1st to 10th	Night	36% 6% 8% 22% 20% 9%	4941
	11th to 20th	Night	29% 5% 9% 21% 27% 8%	4980
	21st to end	Night	37% 5% 10% 21% 21% 7%	5467
April	1st to 10th	Night	39% 5% 11% 17% 22% 6%	2020
	11th to 20th	Night	34% 7% 12% 21% 21% 6%	1975
	21st to end	Night	36% 7% 12% 24% 16% 5%	2000
May	1st to 10th	Night	48% 8% 16% 17% 8% 4	4068
	11th to 20th	Night	47% 9% 13% 20% 10% 1	4033
	21st to end	Night	43% 7% 15% 23% 11% 2	3973
June	1st to 10th	Night	33% 10% 14% 26% 16% 1	1600
	11th to 20th	Night	37% 10% 16% 22% 14% 1	1600
	21st to end	Night	32% 11% 16% 20% 18% 3	1600
July	1st to 10th	Night	39% 10% 20% 15% 14% 2	3710
	11th to 20th	Night	49% 11% 18% 16% 5% 1	4006
	21st to end	Night	39% 10% 15% 22% 13%	4297
August	1st to 10th	Night	47% 7% 16% 23% 6% 1	2904
	11th to 20th	Night	44% 8% 13% 22% 13% 1	2982
	21st to end	Night	37% 8% 13% 29% 12% 1	3586
September	1st to 10th	Night	37% 7% 12% 22% 16% 7%	2000
	11th to 20th	Night	36% 6% 11% 24% 20% 3	2049
	21st to end	Night	47% 6% 11% 18% 15% 3	2285
October	1st to 10th	Night	41% 4 9% 19% 21% 6%	3920
	11th to 20th	Night	25% 4 8% 22% 30% 11%	3899
	21st to end	Night	22% 4 7% 30% 27% 10%	4252
November	1st to 10th	Night	33% 5% 9% 22% 25% 6%	2461
	11th to 20th	Night	37% 4 7% 21% 24% 7%	2773
	21st to end	Night	35% 4 10% 23% 22% 6%	2940
December	1st to 10th	Night	30% 4 10% 28% 24% 4	4720
	11th to 20th	Night	44% 4 10% 19% 17% 6%	5348
	21st to end	Night	39% 7% 13% 24% 16% 1	7150

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	27% 21% 32% 16% 4	323
	11th to 20th	Day	25% 30% 28% 14% 3	330
	21st to end	Day	25% 24% 34% 13% 2 1	363
February	1st to 10th	Day	22% 21% 39% 14% 3	330
	11th to 20th	Day	38% 23% 28% 10% 1	340
	21st to end	Day	29% 17% 30% 21% 3	446
March	1st to 10th	Day	24% 17% 35% 20% 4	508
	11th to 20th	Day	22% 20% 32% 20% 6% 1	500
	21st to end	Day	24% 17% 33% 19% 5% 1	550
April	1st to 10th	Day	25% 18% 29% 20% 6% 1	500
	11th to 20th	Day	19% 16% 31% 21% 10% 3	492
	21st to end	Day	23% 12% 33% 21% 10% 2	500
May	1st to 10th	Day	20% 13% 34% 20% 10% 3	503
	11th to 20th	Day	21% 12% 30% 23% 11% 3	527
	21st to end	Day	21% 4 25% 28% 17% 4	573
June	1st to 10th	Day	13% 4 29% 30% 19% 5%	530
	11th to 20th	Day	13% 7% 25% 32% 16% 8%	530
	21st to end	Day	11% 5% 22% 35% 22% 6%	530
July	1st to 10th	Day	12% 4 16% 33% 27% 9%	525
	11th to 20th	Day	6% 3 16% 36% 27% 12%	524
	21st to end	Day	9% 4 18% 35% 23% 11%	576
August	1st to 10th	Day	14% 4 18% 28% 24% 11%	526
	11th to 20th	Day	13% 3 16% 30% 27% 11%	519
	21st to end	Day	9% 4 16% 33% 24% 13%	583
September	1st to 10th	Day	15% 5% 18% 27% 21% 15%	530
	11th to 20th	Day	15% 3 16% 32% 24% 9%	530
	21st to end	Day	31% 7% 23% 25% 11% 4	530
October	1st to 10th	Day	18% 7% 21% 30% 18% 7%	530
	11th to 20th	Day	17% 12% 26% 25% 17% 3	530
	21st to end	Day	16% 13% 31% 28% 9% 3	583
November	1st to 10th	Day	16% 10% 34% 26% 11% 3	535
	11th to 20th	Day	18% 12% 33% 27% 8% 2	373
	21st to end	Day	20% 18% 32% 22% 7%	220
December	1st to 10th	Day	23% 16% 37% 18% 5%	220
	11th to 20th	Day	21% 15% 34% 21% 8% 1	220
	21st to end	Day	24% 19% 34% 16% 6% 1	242
January	1st to 10th	Night	18% 14% 40% 25% 3	840
	11th to 20th	Night	19% 14% 34% 29% 3	840
	21st to end	Night	17% 13% 41% 26% 2	924
February	1st to 10th	Night	18% 12% 39% 29% 2	840
	11th to 20th	Night	24% 16% 40% 19% 2	823
	21st to end	Night	21% 14% 41% 22% 2	692
March	1st to 10th	Night	17% 17% 37% 26% 3	809
	11th to 20th	Night	21% 14% 36% 22% 6% 1	800
	21st to end	Night	18% 15% 37% 26% 5%	880
April	1st to 10th	Night	19% 16% 36% 24% 5%	800
	11th to 20th	Night	14% 13% 36% 29% 8% 1	791
	21st to end	Night	16% 9% 35% 33% 7%	800
May	1st to 10th	Night	21% 8% 29% 30% 12% 1	608
	11th to 20th	Night	20% 4 27% 34% 15% 1	591
	21st to end	Night	17% 1 20% 38% 21% 3	454
June	1st to 10th	Night	11% 2 20% 45% 22% 1	400
	11th to 20th	Night	12% 2 18% 42% 24% 2	400
	21st to end	Night	10% 1 21% 48% 20% 2	400
July	1st to 10th	Night	13% 3 14% 36% 32% 3	449
	11th to 20th	Night	6% 2 12% 39% 36% 5%	582
	21st to end	Night	8% 1 15% 41% 30% 5%	657
August	1st to 10th	Night	13% 2 11% 40% 31% 3	597
	11th to 20th	Night	14% 3 11% 39% 30% 3	635
	21st to end	Night	13% 3 12% 37% 31% 4	880
September	1st to 10th	Night	16% 2 14% 35% 28% 5%	800
	11th to 20th	Night	13% 4 15% 36% 29% 3	800
	21st to end	Night	26% 4 18% 31% 20% 1	800
October	1st to 10th	Night	20% 5% 19% 30% 22% 4	800
	11th to 20th	Night	18% 7% 25% 34% 16% 1	800
	21st to end	Night	16% 7% 31% 34% 11% 1	880
November	1st to 10th	Night	15% 7% 31% 33% 13% 2	820
	11th to 20th	Night	17% 9% 34% 31% 8%	840
	21st to end	Night	14% 9% 36% 31% 10% 1	840
December	1st to 10th	Night	19% 10% 36% 27% 8%	840
	11th to 20th	Night	19% 8% 35% 33% 5%	840
	21st to end	Night	19% 9% 32% 36% 3	924

Page generated at 2026-02-28 01:40:22. Version ac07

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