Ebo Landing
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Ebo Landing clear sky chart from 2005-11-06 to 2025-12-18.

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	9% 5% 2 6% 5% 5% 5% 4 7% 9% 43%	127041
	Night	10% 6% 2 6% 4 4 5% 4 6% 9% 43%	123998
Transparency	Day	35% 7% 18% 21% 15% 5%	130726
	Night	37% 6% 14% 19% 17% 7%	128382
Seeing	Day	11% 3 11% 27% 32% 16%	16954
	Night	12% 4 14% 30% 31% 9%	27019

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	8% 6% 2 5% 3 4 3 3 4 6% 55%	4056
	11th to 20th	Day	16% 6% 2 6% 4 4 4 3 5% 6% 44%	4060
	21st to end	Day	12% 8% 3 7% 5% 3 3 3 5% 8% 45%	4466
February	1st to 10th	Day	15% 6% 2 5% 5% 3 5% 3 6% 7% 43%	1940
	11th to 20th	Day	14% 6% 2 6% 4 4 5% 3 4 6% 47%	1948
	21st to end	Day	13% 6% 2 5% 5% 3 3 2 4 8% 48%	1733
March	1st to 10th	Day	16% 8% 3 7% 4 4 4 3 5% 7% 39%	4935
	11th to 20th	Day	7% 3 1 4 3 3 4 3 6% 8% 57%	4980
	21st to end	Day	13% 6% 2 6% 4 4 3 3 5% 6% 48%	5465
April	1st to 10th	Day	8% 5% 2 5% 4 3 4 3 7% 9% 51%	2200
	11th to 20th	Day	10% 5% 2 5% 4 3 4 3 6% 7% 50%	2279
	21st to end	Day	5% 4 1 4 4 4 5% 3 5% 8% 57%	2444
May	1st to 10th	Day	8% 4 2 6% 4 5% 5% 4 7% 11% 45%	5862
	11th to 20th	Day	10% 6% 2 6% 4 4 5% 4 6% 10% 43%	5861
	21st to end	Day	4 2 1 4 4 5% 6% 6% 8% 11% 48%	6433
June	1st to 10th	Day	9% 6% 2 6% 6% 5% 5% 5% 10% 12% 33%	2600
	11th to 20th	Day	5% 4 2 6% 6% 6% 7% 6% 9% 12% 37%	2600
	21st to end	Day	7% 5% 2 6% 6% 7% 7% 7% 10% 11% 32%	2600
July	1st to 10th	Day	6% 5% 2 9% 7% 7% 8% 7% 10% 12% 26%	5900
	11th to 20th	Day	3 2 1 5% 4 5% 7% 6% 10% 16% 40%	5900
	21st to end	Day	3 3 1 5% 5% 6% 6% 6% 9% 13% 42%	6424
August	1st to 10th	Day	12% 6% 3 8% 6% 6% 6% 5% 8% 12% 27%	4234
	11th to 20th	Day	5% 3 2 6% 5% 5% 6% 6% 9% 13% 40%	4151
	21st to end	Day	9% 6% 3 7% 6% 6% 6% 6% 8% 10% 34%	4082
September	1st to 10th	Day	11% 6% 3 9% 6% 6% 7% 4 8% 10% 31%	2200
	11th to 20th	Day	14% 6% 3 8% 6% 5% 6% 5% 7% 8% 32%	2200
	21st to end	Day	14% 6% 3 6% 5% 5% 5% 4 6% 9% 37%	2200
October	1st to 10th	Day	13% 6% 2 7% 5% 4 5% 3 7% 8% 41%	2134
	11th to 20th	Day	8% 4 2 4 4 4 4 4 4 8% 55%	2000
	21st to end	Day	10% 5% 2 4 3 3 5% 3 4 7% 53%	2200
November	1st to 10th	Day	11% 6% 2 5% 4 4 3 3 6% 7% 51%	2057
	11th to 20th	Day	10% 7% 2 4 4 3 3 3 5% 7% 51%	2085
	21st to end	Day	12% 6% 3 6% 4 3 4 4 5% 8% 47%	1890
December	1st to 10th	Day	7% 4 2 5% 5% 4 4 3 4 7% 55%	3020
	11th to 20th	Day	14% 7% 3 6% 4 4 4 3 5% 6% 44%	3436
	21st to end	Day	14% 8% 3 8% 4 4 4 3 5% 6% 41%	4466
January	1st to 10th	Night	10% 5% 2 5% 3 3 3 3 5% 6% 56%	5889
	11th to 20th	Night	13% 7% 3 7% 4 4 5% 4 5% 7% 40%	5900
	21st to end	Night	13% 7% 3 7% 4 4 3 3 5% 8% 43%	6490
February	1st to 10th	Night	15% 7% 2 6% 4 4 4 3 5% 6% 43%	2456
	11th to 20th	Night	14% 8% 3 5% 4 4 4 3 4 6% 45%	2338
	21st to end	Night	13% 5% 2 5% 5% 4 5% 4 6% 6% 45%	1895
March	1st to 10th	Night	17% 10% 3 6% 3 3 4 3 4 5% 43%	4918
	11th to 20th	Night	6% 4 1 4 3 3 4 4 6% 10% 53%	4980
	21st to end	Night	10% 7% 2 5% 4 4 3 3 5% 7% 50%	5467
April	1st to 10th	Night	9% 4 1 5% 4 4 4 4 6% 8% 50%	2200
	11th to 20th	Night	9% 5% 2 6% 4 3 3 4 5% 7% 53%	2067
	21st to end	Night	6% 4 1 4 4 4 4 3 6% 9% 55%	1970
May	1st to 10th	Night	5% 5% 2 6% 5% 5% 5% 5% 6% 11% 45%	4033
	11th to 20th	Night	12% 6% 2 5% 3 4 5% 4 6% 10% 42%	4032
	21st to end	Night	6% 4 2 6% 5% 5% 5% 5% 7% 11% 43%	4421
June	1st to 10th	Night	9% 6% 3 6% 5% 6% 6% 5% 9% 10% 35%	1800
	11th to 20th	Night	6% 6% 2 7% 5% 6% 6% 5% 10% 14% 36%	1800
	21st to end	Night	8% 4 3 6% 5% 6% 5% 6% 9% 16% 33%	1800
July	1st to 10th	Night	6% 6% 3 9% 7% 7% 8% 5% 10% 12% 27%	4058
	11th to 20th	Night	3 4 2 7% 6% 6% 7% 7% 10% 14% 34%	4057
	21st to end	Night	4 5% 2 7% 6% 6% 8% 6% 10% 13% 32%	4427
August	1st to 10th	Night	15% 6% 3 7% 6% 6% 7% 6% 9% 12% 25%	2915
	11th to 20th	Night	4 4 2 6% 5% 6% 7% 5% 9% 13% 39%	2875
	21st to end	Night	8% 5% 2 7% 6% 5% 6% 5% 8% 10% 38%	3799
September	1st to 10th	Night	11% 8% 3 6% 7% 5% 6% 5% 8% 11% 30%	2200
	11th to 20th	Night	14% 7% 3 8% 6% 6% 5% 5% 8% 9% 29%	2200
	21st to end	Night	13% 6% 3 10% 4 4 4 4 7% 8% 37%	2200
October	1st to 10th	Night	14% 6% 2 7% 4 4 5% 4 7% 8% 41%	2265
	11th to 20th	Night	8% 4 1 4 3 4 4 3 5% 7% 56%	2400
	21st to end	Night	9% 4 2 5% 4 4 4 4 5% 6% 54%	2640
November	1st to 10th	Night	11% 5% 1 5% 5% 4 4 4 5% 7% 49%	2461
	11th to 20th	Night	12% 7% 3 5% 4 4 4 3 5% 6% 49%	2531
	21st to end	Night	13% 5% 2 5% 4 4 4 3 6% 8% 45%	2730
December	1st to 10th	Night	10% 5% 2 5% 3 3 3 2 4 7% 54%	4380
	11th to 20th	Night	12% 8% 3 8% 4 4 4 3 4 5% 45%	4914
	21st to end	Night	15% 8% 3 7% 4 4 4 3 5% 6% 41%	6490

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	31% 4 7% 15% 33% 10%	4057
	11th to 20th	Day	42% 3 6% 15% 23% 12%	4060
	21st to end	Day	38% 7% 5% 22% 17% 10%	4466
February	1st to 10th	Day	40% 5% 11% 16% 21% 8%	1940
	11th to 20th	Day	39% 4 8% 17% 22% 9%	1958
	21st to end	Day	35% 4 10% 20% 19% 11%	1733
March	1st to 10th	Day	44% 4 9% 17% 20% 6%	4935
	11th to 20th	Day	25% 5% 14% 17% 17% 22%	4980
	21st to end	Day	37% 4 10% 19% 19% 11%	5465
April	1st to 10th	Day	29% 6% 13% 25% 18% 10%	2200
	11th to 20th	Day	32% 5% 10% 23% 19% 10%	2279
	21st to end	Day	23% 6% 15% 27% 24% 5%	2444
May	1st to 10th	Day	31% 7% 18% 30% 11% 2	5897
	11th to 20th	Day	35% 6% 18% 30% 9% 1	5865
	21st to end	Day	25% 7% 22% 27% 17% 2	6447
June	1st to 10th	Day	37% 10% 22% 21% 10%	2600
	11th to 20th	Day	32% 12% 23% 26% 8%	2600
	21st to end	Day	37% 13% 27% 17% 6%	2600
July	1st to 10th	Day	41% 12% 33% 12% 1	5835
	11th to 20th	Day	24% 11% 48% 15% 2	5831
	21st to end	Day	28% 12% 32% 24% 4	6240
August	1st to 10th	Day	45% 9% 31% 13% 1	4221
	11th to 20th	Day	30% 9% 27% 24% 10%	4190
	21st to end	Day	40% 9% 23% 25% 2	4082
September	1st to 10th	Day	44% 12% 19% 16% 8% 1	2200
	11th to 20th	Day	45% 9% 16% 19% 9% 1	2200
	21st to end	Day	41% 7% 17% 19% 14% 3	2200
October	1st to 10th	Day	46% 5% 11% 12% 16% 10%	3472
	11th to 20th	Day	20% 5% 5% 22% 35% 13%	3240
	21st to end	Day	23% 3 6% 23% 35% 10%	3538
November	1st to 10th	Day	33% 4 13% 20% 20% 11%	2057
	11th to 20th	Day	34% 4 9% 20% 24% 9%	2085
	21st to end	Day	35% 4 11% 23% 20% 7%	1890
December	1st to 10th	Day	30% 4 11% 24% 23% 8%	3020
	11th to 20th	Day	42% 4 10% 19% 20% 5%	3433
	21st to end	Day	46% 4 8% 22% 16% 4	4466
January	1st to 10th	Night	29% 3 7% 12% 38% 11%	5889
	11th to 20th	Night	44% 3 6% 15% 24% 8%	5900
	21st to end	Night	41% 4 8% 18% 19% 11%	6490
February	1st to 10th	Night	41% 5% 8% 16% 20% 10%	2456
	11th to 20th	Night	41% 4 8% 17% 19% 12%	2339
	21st to end	Night	38% 5% 9% 20% 16% 11%	1895
March	1st to 10th	Night	43% 4 10% 16% 16% 12%	4918
	11th to 20th	Night	26% 5% 12% 19% 20% 19%	4980
	21st to end	Night	35% 4 9% 19% 21% 12%	5467
April	1st to 10th	Night	30% 6% 14% 21% 17% 11%	2200
	11th to 20th	Night	30% 5% 8% 26% 22% 9%	2067
	21st to end	Night	25% 4 14% 27% 23% 6%	1970
May	1st to 10th	Night	31% 9% 19% 26% 12% 2	4060
	11th to 20th	Night	37% 6% 20% 26% 10% 1	4033
	21st to end	Night	32% 8% 16% 28% 15% 1	4429
June	1st to 10th	Night	39% 10% 21% 21% 10%	1800
	11th to 20th	Night	35% 11% 22% 23% 8%	1800
	21st to end	Night	35% 13% 28% 18% 6% 1	1800
July	1st to 10th	Night	45% 10% 31% 13% 1	4015
	11th to 20th	Night	36% 13% 37% 12% 2	4006
	21st to end	Night	39% 11% 27% 22% 2	4297
August	1st to 10th	Night	49% 10% 30% 10% 1	2904
	11th to 20th	Night	34% 8% 26% 25% 8%	2902
	21st to end	Night	38% 9% 22% 28% 3	3799
September	1st to 10th	Night	46% 11% 18% 16% 8% 1	2200
	11th to 20th	Night	47% 10% 17% 17% 9%	2200
	21st to end	Night	43% 7% 15% 18% 14% 3	2200
October	1st to 10th	Night	47% 5% 10% 14% 14% 11%	3707
	11th to 20th	Night	21% 4 5% 19% 33% 18%	3899
	21st to end	Night	22% 4 6% 20% 35% 13%	4252
November	1st to 10th	Night	35% 4 9% 20% 20% 12%	2461
	11th to 20th	Night	37% 4 8% 19% 22% 10%	2531
	21st to end	Night	37% 4 10% 21% 19% 9%	2730
December	1st to 10th	Night	31% 3 11% 21% 25% 9%	4380
	11th to 20th	Night	41% 3 10% 21% 17% 8%	4916
	21st to end	Night	45% 4 10% 18% 20% 3	6490

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	12% 6% 27% 39% 16%	300
	11th to 20th	Day	7% 4 22% 43% 20% 4	300
	21st to end	Day	18% 4 27% 39% 11%	330
February	1st to 10th	Day	16% 4 20% 36% 23% 1	300
	11th to 20th	Day	20% 3 22% 37% 17% 1	300
	21st to end	Day	14% 2 20% 45% 17% 2	332
March	1st to 10th	Day	12% 3 27% 36% 20% 2	500
	11th to 20th	Day	13% 4 22% 35% 22% 4	500
	21st to end	Day	13% 5% 22% 38% 19% 2	550
April	1st to 10th	Day	10% 2 21% 42% 22% 3	500
	11th to 20th	Day	10% 3 20% 33% 27% 8%	492
	21st to end	Day	6% 2 12% 34% 36% 11%	500
May	1st to 10th	Day	6% 2 15% 36% 33% 9%	503
	11th to 20th	Day	7% 2 8% 32% 38% 13%	527
	21st to end	Day	8% 2 5% 23% 40% 23%	573
June	1st to 10th	Day	13% 1 3 22% 42% 20%	530
	11th to 20th	Day	8% 2 2 20% 38% 29%	530
	21st to end	Day	7% 2 1 13% 45% 32%	530
July	1st to 10th	Day	6% 2 1 9% 41% 41%	525
	11th to 20th	Day	5% 1 5% 45% 44%	524
	21st to end	Day	5% 3 1 9% 45% 37%	576
August	1st to 10th	Day	9% 2 2 11% 41% 36%	526
	11th to 20th	Day	5% 1 1 6% 43% 44%	519
	21st to end	Day	12% 3 1 11% 39% 33%	583
September	1st to 10th	Day	15% 3 3 14% 40% 24%	530
	11th to 20th	Day	16% 3 2 20% 43% 16%	530
	21st to end	Day	15% 2 5% 16% 42% 20%	530
October	1st to 10th	Day	18% 3 7% 32% 32% 8%	530
	11th to 20th	Day	9% 4 12% 33% 31% 11%	530
	21st to end	Day	11% 2 11% 30% 37% 8%	583
November	1st to 10th	Day	16% 3 16% 28% 28% 10%	535
	11th to 20th	Day	18% 2 16% 38% 21% 5%	525
	21st to end	Day	15% 2 16% 40% 23% 4	330
December	1st to 10th	Day	13% 2 22% 44% 17% 3	330
	11th to 20th	Day	18% 3 20% 35% 22% 2	321
	21st to end	Day	16% 5% 16% 37% 24% 3	330
January	1st to 10th	Night	14% 8% 29% 36% 12% 1	800
	11th to 20th	Night	12% 7% 25% 36% 17% 3	800
	21st to end	Night	18% 6% 28% 39% 9% 1	880
February	1st to 10th	Night	17% 4 25% 36% 16% 2	800
	11th to 20th	Night	19% 6% 24% 37% 14%	783
	21st to end	Night	17% 4 20% 47% 12%	660
March	1st to 10th	Night	12% 3 25% 42% 18% 1	800
	11th to 20th	Night	12% 5% 20% 42% 19% 3	800
	21st to end	Night	11% 4 22% 39% 22% 2	880
April	1st to 10th	Night	11% 3 23% 40% 21% 3	800
	11th to 20th	Night	10% 4 19% 35% 26% 5%	791
	21st to end	Night	7% 2 13% 37% 36% 5%	770
May	1st to 10th	Night	7% 2 14% 37% 32% 9%	600
	11th to 20th	Night	7% 1 11% 33% 35% 13%	591
	21st to end	Night	10% 2 4 27% 42% 15%	650
June	1st to 10th	Night	11% 1 2 31% 45% 11%	600
	11th to 20th	Night	7% 2 3 23% 43% 23%	600
	21st to end	Night	10% 2 2 17% 48% 21%	600
July	1st to 10th	Night	7% 2 2 16% 45% 28%	585
	11th to 20th	Night	7% 2 1 10% 48% 32%	582
	21st to end	Night	5% 3 1 14% 57% 20%	657
August	1st to 10th	Night	12% 2 1 12% 52% 21%	597
	11th to 20th	Night	7% 2 2 10% 49% 30%	594
	21st to end	Night	14% 2 3 14% 41% 26%	870
September	1st to 10th	Night	13% 2 3 16% 46% 20%	800
	11th to 20th	Night	15% 3 4 19% 46% 14%	800
	21st to end	Night	15% 2 4 22% 43% 14%	800
October	1st to 10th	Night	18% 2 9% 29% 34% 9%	800
	11th to 20th	Night	9% 3 13% 31% 37% 8%	800
	21st to end	Night	11% 3 15% 28% 36% 7%	880
November	1st to 10th	Night	13% 4 15% 34% 29% 5%	820
	11th to 20th	Night	15% 5% 20% 33% 23% 3	840
	21st to end	Night	14% 5% 19% 35% 22% 4	840
December	1st to 10th	Night	16% 5% 22% 32% 22% 3	840
	11th to 20th	Night	17% 4 22% 32% 22% 4	829
	21st to end	Night	17% 7% 18% 35% 20% 2	880

Page generated at 2025-12-15 01:13:50. Version ac07

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