Ebenezer Rd
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Ebenezer Rd clear sky chart from 2005-11-06 to 2025-09-19.

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% 4 6% 8% 40%	126216
	Night	11% 6% 2 6% 4 4 4 4 6% 8% 44%	122843
Transparency	Day	40% 5% 13% 19% 16% 7%	129888
	Night	38% 5% 13% 18% 18% 8%	127240
Seeing	Day	16% 9% 25% 25% 18% 8%	16579
	Night	15% 8% 23% 32% 20% 3	26616

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	11% 4 2 5% 4 4 4 3 4 5% 55%	4056
	11th to 20th	Day	14% 6% 2 5% 4 3 3 3 4 7% 50%	4060
	21st to end	Day	13% 7% 2 6% 4 3 4 3 5% 7% 45%	4466
February	1st to 10th	Day	14% 7% 3 5% 5% 4 5% 3 6% 7% 41%	1885
	11th to 20th	Day	19% 6% 2 5% 3 3 3 2 5% 5% 47%	1948
	21st to end	Day	13% 6% 3 5% 4 3 3 3 5% 7% 47%	1726
March	1st to 10th	Day	20% 8% 2 7% 3 4 4 3 5% 6% 38%	4935
	11th to 20th	Day	7% 4 1 5% 3 3 3 4 6% 7% 55%	4980
	21st to end	Day	13% 6% 2 6% 4 4 4 3 4 5% 48%	5465
April	1st to 10th	Day	9% 5% 1 5% 5% 4 5% 4 6% 6% 50%	2200
	11th to 20th	Day	11% 5% 2 5% 4 4 4 3 5% 8% 49%	2309
	21st to end	Day	5% 5% 2 4 4 4 5% 4 6% 8% 52%	2473
May	1st to 10th	Day	9% 5% 2 7% 5% 5% 6% 4 7% 10% 39%	5862
	11th to 20th	Day	15% 6% 2 6% 5% 5% 5% 3 6% 9% 38%	5861
	21st to end	Day	7% 4 2 6% 5% 5% 6% 4 7% 10% 44%	6433
June	1st to 10th	Day	9% 7% 3 8% 7% 6% 7% 7% 8% 10% 30%	2600
	11th to 20th	Day	6% 4 2 6% 6% 8% 8% 5% 8% 12% 34%	2600
	21st to end	Day	7% 6% 2 8% 7% 7% 8% 6% 9% 10% 30%	2600
July	1st to 10th	Day	11% 8% 4 11% 9% 7% 7% 6% 9% 10% 18%	5900
	11th to 20th	Day	4 3 2 8% 7% 8% 9% 8% 10% 14% 26%	5900
	21st to end	Day	5% 5% 3 8% 8% 8% 8% 7% 10% 13% 25%	6424
August	1st to 10th	Day	20% 7% 3 8% 7% 7% 6% 6% 8% 9% 19%	4234
	11th to 20th	Day	7% 5% 2 7% 6% 7% 7% 7% 9% 12% 30%	4174
	21st to end	Day	10% 7% 3 9% 6% 7% 7% 6% 8% 10% 29%	4183
September	1st to 10th	Day	10% 7% 3 8% 6% 8% 8% 5% 7% 8% 31%	2200
	11th to 20th	Day	12% 8% 3 8% 6% 6% 6% 4 6% 7% 34%	2178
	21st to end	Day	14% 6% 3 7% 6% 5% 5% 4 6% 7% 38%	2090
October	1st to 10th	Day	12% 6% 3 8% 5% 4 4 2 5% 5% 47%	2008
	11th to 20th	Day	10% 4 1 3 3 3 3 3 4 6% 59%	1900
	21st to end	Day	10% 5% 2 5% 3 4 3 3 5% 5% 55%	2090
November	1st to 10th	Day	11% 6% 2 5% 4 3 4 3 5% 6% 51%	1957
	11th to 20th	Day	12% 7% 2 5% 3 2 3 3 4 7% 51%	1950
	21st to end	Day	14% 6% 1 5% 3 3 4 2 4 7% 50%	1800
December	1st to 10th	Day	8% 5% 2 6% 4 4 5% 3 5% 5% 53%	2930
	11th to 20th	Day	14% 5% 2 5% 3 3 4 3 5% 7% 49%	3373
	21st to end	Day	18% 10% 3 5% 3 3 3 3 5% 6% 41%	4466
January	1st to 10th	Night	11% 5% 2 4 3 4 3 3 4 5% 56%	5889
	11th to 20th	Night	12% 7% 2 6% 4 4 4 3 6% 7% 44%	5900
	21st to end	Night	13% 8% 3 6% 4 3 4 3 4 6% 45%	6490
February	1st to 10th	Night	14% 7% 2 6% 4 4 4 3 4 6% 44%	2512
	11th to 20th	Night	17% 7% 2 5% 4 3 4 3 5% 5% 46%	2338
	21st to end	Night	11% 6% 2 6% 5% 5% 4 4 5% 7% 46%	1902
March	1st to 10th	Night	19% 10% 3 6% 4 3 3 3 4 5% 41%	4918
	11th to 20th	Night	10% 5% 2 4 3 3 4 3 6% 8% 52%	4980
	21st to end	Night	13% 5% 2 6% 3 3 4 3 5% 6% 51%	5467
April	1st to 10th	Night	11% 5% 2 5% 4 4 4 4 6% 6% 49%	2200
	11th to 20th	Night	11% 5% 2 5% 3 3 3 2 5% 7% 54%	2037
	21st to end	Night	7% 4 2 4 4 3 4 5% 6% 8% 53%	1942
May	1st to 10th	Night	6% 6% 2 7% 5% 5% 5% 4 7% 11% 42%	4033
	11th to 20th	Night	15% 5% 2 6% 4 4 5% 4 7% 11% 39%	4032
	21st to end	Night	9% 5% 2 5% 4 4 5% 4 7% 9% 46%	4421
June	1st to 10th	Night	9% 6% 2 7% 5% 6% 5% 5% 9% 13% 34%	1800
	11th to 20th	Night	7% 5% 2 7% 6% 5% 5% 5% 9% 13% 37%	1800
	21st to end	Night	6% 4 2 5% 5% 7% 7% 6% 11% 13% 34%	1800
July	1st to 10th	Night	9% 8% 3 9% 7% 6% 6% 5% 8% 11% 26%	4058
	11th to 20th	Night	4 5% 2 7% 6% 7% 7% 5% 9% 15% 33%	4057
	21st to end	Night	7% 7% 3 9% 6% 6% 7% 6% 8% 11% 31%	4427
August	1st to 10th	Night	18% 6% 3 7% 5% 6% 6% 5% 9% 11% 23%	2915
	11th to 20th	Night	6% 5% 2 7% 5% 6% 6% 6% 9% 10% 37%	2875
	21st to end	Night	8% 5% 2 7% 5% 5% 5% 4 7% 10% 42%	3673
September	1st to 10th	Night	11% 7% 3 6% 6% 5% 5% 6% 7% 10% 36%	2200
	11th to 20th	Night	10% 7% 2 8% 5% 5% 4 5% 6% 9% 38%	2179
	21st to end	Night	13% 7% 3 7% 5% 5% 4 4 7% 8% 39%	2090
October	1st to 10th	Night	13% 7% 2 6% 3 4 4 3 4 6% 49%	2171
	11th to 20th	Night	10% 5% 1 5% 3 3 3 3 4 5% 59%	2280
	21st to end	Night	9% 5% 2 5% 3 4 4 3 4 5% 55%	2508
November	1st to 10th	Night	12% 5% 2 5% 3 3 4 3 5% 6% 51%	2341
	11th to 20th	Night	14% 7% 2 5% 4 3 3 2 4 5% 51%	2446
	21st to end	Night	12% 5% 2 6% 4 4 4 3 5% 6% 49%	2600
December	1st to 10th	Night	9% 6% 2 4 3 3 4 3 4 5% 56%	4250
	11th to 20th	Night	16% 8% 3 7% 4 4 3 3 4 5% 43%	4822
	21st to end	Night	17% 8% 3 6% 4 4 4 3 5% 5% 43%	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	32% 4 5% 15% 33% 11%	4057
	11th to 20th	Day	37% 2 5% 18% 27% 11%	4060
	21st to end	Day	39% 3 6% 19% 20% 12%	4466
February	1st to 10th	Day	42% 4 9% 18% 20% 8%	1885
	11th to 20th	Day	41% 3 6% 16% 26% 8%	1958
	21st to end	Day	37% 3 8% 19% 21% 12%	1726
March	1st to 10th	Day	48% 4 6% 14% 18% 11%	4935
	11th to 20th	Day	28% 3 10% 18% 20% 22%	4980
	21st to end	Day	40% 3 7% 18% 20% 12%	5465
April	1st to 10th	Day	33% 4 10% 23% 19% 11%	2200
	11th to 20th	Day	34% 4 9% 21% 21% 11%	2309
	21st to end	Day	28% 5% 10% 27% 23% 6%	2473
May	1st to 10th	Day	39% 6% 15% 25% 13% 3	5897
	11th to 20th	Day	43% 4 17% 23% 12% 1	5865
	21st to end	Day	34% 6% 16% 22% 22% 1	6447
June	1st to 10th	Day	45% 9% 16% 17% 12% 1	2600
	11th to 20th	Day	39% 9% 17% 24% 11% 1	2600
	21st to end	Day	43% 10% 20% 18% 9% 1	2600
July	1st to 10th	Day	58% 6% 21% 12% 2 1	5835
	11th to 20th	Day	43% 9% 33% 12% 2	5831
	21st to end	Day	47% 8% 23% 19% 3	6240
August	1st to 10th	Day	58% 6% 23% 10% 2	4221
	11th to 20th	Day	42% 7% 20% 23% 8%	4213
	21st to end	Day	49% 5% 15% 26% 4	4183
September	1st to 10th	Day	47% 8% 15% 13% 14% 4	2200
	11th to 20th	Day	47% 7% 12% 18% 13% 4	2178
	21st to end	Day	44% 5% 12% 18% 17% 4	2090
October	1st to 10th	Day	46% 4 6% 12% 21% 12%	3333
	11th to 20th	Day	17% 2 5% 13% 28% 35%	3140
	21st to end	Day	25% 3 5% 20% 33% 14%	3428
November	1st to 10th	Day	35% 3 8% 17% 23% 14%	1957
	11th to 20th	Day	35% 3 7% 19% 23% 13%	1950
	21st to end	Day	37% 3 7% 22% 21% 10%	1800
December	1st to 10th	Day	33% 3 9% 17% 23% 15%	2930
	11th to 20th	Day	37% 2 6% 26% 23% 5%	3370
	21st to end	Day	46% 2 5% 20% 24% 3	4466
January	1st to 10th	Night	31% 3 6% 14% 35% 11%	5889
	11th to 20th	Night	40% 3 4 17% 26% 9%	5900
	21st to end	Night	41% 3 8% 13% 24% 11%	6490
February	1st to 10th	Night	42% 4 8% 19% 20% 8%	2512
	11th to 20th	Night	41% 3 8% 16% 21% 11%	2339
	21st to end	Night	39% 3 9% 19% 16% 14%	1902
March	1st to 10th	Night	46% 3 7% 14% 17% 13%	4918
	11th to 20th	Night	30% 3 8% 15% 24% 20%	4980
	21st to end	Night	35% 3 10% 18% 21% 13%	5467
April	1st to 10th	Night	35% 5% 11% 20% 19% 11%	2200
	11th to 20th	Night	30% 4 8% 25% 21% 12%	2037
	21st to end	Night	27% 5% 13% 27% 22% 6%	1942
May	1st to 10th	Night	34% 6% 18% 27% 11% 3	4060
	11th to 20th	Night	39% 6% 21% 23% 11% 1	4033
	21st to end	Night	33% 6% 15% 27% 16% 2	4429
June	1st to 10th	Night	37% 9% 22% 21% 10% 1	1800
	11th to 20th	Night	36% 10% 22% 25% 7%	1800
	21st to end	Night	35% 13% 26% 19% 7% 1	1800
July	1st to 10th	Night	50% 8% 23% 16% 2 1	4015
	11th to 20th	Night	39% 9% 39% 11% 2	4006
	21st to end	Night	45% 10% 21% 19% 4	4297
August	1st to 10th	Night	52% 9% 26% 11% 2	2904
	11th to 20th	Night	37% 8% 25% 24% 6%	2902
	21st to end	Night	37% 6% 20% 33% 4	3673
September	1st to 10th	Night	41% 10% 19% 17% 12% 2	2200
	11th to 20th	Night	41% 7% 18% 19% 12% 3	2179
	21st to end	Night	42% 7% 13% 18% 17% 2	2090
October	1st to 10th	Night	39% 3 9% 16% 24% 9%	3626
	11th to 20th	Night	18% 2 4 13% 27% 36%	3779
	21st to end	Night	24% 3 5% 19% 32% 17%	4120
November	1st to 10th	Night	35% 3 9% 16% 23% 14%	2341
	11th to 20th	Night	37% 2 6% 18% 24% 12%	2446
	21st to end	Night	37% 3 8% 19% 22% 10%	2600
December	1st to 10th	Night	31% 3 8% 17% 30% 11%	4250
	11th to 20th	Night	45% 2 9% 17% 20% 8%	4824
	21st to end	Night	44% 3 6% 19% 24% 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	18% 22% 49% 8% 3	300
	11th to 20th	Day	20% 18% 39% 15% 7% 1	300
	21st to end	Day	33% 22% 36% 7% 2	330
February	1st to 10th	Day	22% 17% 42% 15% 3 1	300
	11th to 20th	Day	33% 19% 34% 14%	300
	21st to end	Day	20% 19% 41% 17% 4	325
March	1st to 10th	Day	23% 16% 32% 19% 9% 1	500
	11th to 20th	Day	17% 17% 39% 19% 6% 2	500
	21st to end	Day	19% 18% 36% 18% 8% 1	550
April	1st to 10th	Day	20% 15% 33% 21% 9% 2	500
	11th to 20th	Day	15% 15% 31% 23% 11% 5%	492
	21st to end	Day	9% 11% 31% 27% 15% 7%	500
May	1st to 10th	Day	9% 13% 31% 28% 14% 5%	503
	11th to 20th	Day	13% 5% 29% 26% 18% 9%	527
	21st to end	Day	13% 5% 20% 28% 23% 11%	573
June	1st to 10th	Day	12% 3 20% 29% 24% 11%	530
	11th to 20th	Day	7% 5% 16% 31% 24% 16%	530
	21st to end	Day	7% 2 13% 36% 26% 15%	530
July	1st to 10th	Day	9% 2 9% 26% 35% 20%	525
	11th to 20th	Day	10% 1 4 27% 39% 20%	524
	21st to end	Day	7% 3 7% 35% 33% 14%	576
August	1st to 10th	Day	15% 2 11% 30% 26% 16%	526
	11th to 20th	Day	9% 2 8% 29% 34% 19%	519
	21st to end	Day	16% 1 11% 27% 27% 17%	583
September	1st to 10th	Day	15% 2 12% 31% 29% 11%	530
	11th to 20th	Day	17% 2 16% 34% 23% 7%	522
	21st to end	Day	14% 2 16% 32% 25% 11%	490
October	1st to 10th	Day	18% 4 27% 26% 17% 8%	490
	11th to 20th	Day	13% 6% 25% 31% 19% 7%	490
	21st to end	Day	15% 7% 26% 28% 21% 4	539
November	1st to 10th	Day	18% 7% 29% 27% 15% 4	495
	11th to 20th	Day	20% 10% 38% 21% 9% 2	450
	21st to end	Day	19% 11% 37% 25% 7% 1	300
December	1st to 10th	Day	20% 15% 39% 17% 8% 1	300
	11th to 20th	Day	21% 15% 35% 21% 8%	300
	21st to end	Day	32% 10% 32% 21% 5% 1	330
January	1st to 10th	Night	18% 16% 32% 27% 6%	800
	11th to 20th	Night	16% 15% 30% 31% 8% 1	800
	21st to end	Night	21% 15% 35% 25% 4	880
February	1st to 10th	Night	21% 12% 33% 29% 6%	800
	11th to 20th	Night	24% 15% 32% 24% 5%	783
	21st to end	Night	17% 15% 36% 28% 4	660
March	1st to 10th	Night	16% 13% 32% 33% 6%	800
	11th to 20th	Night	17% 13% 34% 28% 8% 1	800
	21st to end	Night	13% 14% 36% 28% 8%	880
April	1st to 10th	Night	15% 14% 35% 27% 8% 1	800
	11th to 20th	Night	14% 12% 31% 29% 14% 1	791
	21st to end	Night	10% 9% 29% 37% 14% 1	742
May	1st to 10th	Night	8% 7% 24% 42% 19% 1	600
	11th to 20th	Night	8% 5% 25% 38% 21% 3	591
	21st to end	Night	13% 1 13% 39% 30% 4	650
June	1st to 10th	Night	12% 1 13% 42% 28% 4	600
	11th to 20th	Night	8% 2 13% 33% 35% 9%	600
	21st to end	Night	6% 2 11% 39% 35% 7%	600
July	1st to 10th	Night	9% 1 8% 32% 42% 8%	585
	11th to 20th	Night	9% 1 3 32% 45% 10%	582
	21st to end	Night	8% 1 5% 38% 41% 7%	657
August	1st to 10th	Night	11% 6% 34% 38% 10%	597
	11th to 20th	Night	10% 1 4 30% 44% 11%	594
	21st to end	Night	15% 2 8% 31% 33% 11%	855
September	1st to 10th	Night	14% 2 9% 33% 36% 6%	800
	11th to 20th	Night	14% 1 11% 37% 32% 5%	793
	21st to end	Night	17% 1 14% 31% 32% 4	760
October	1st to 10th	Night	16% 3 22% 30% 24% 5%	760
	11th to 20th	Night	12% 5% 21% 36% 22% 4	760
	21st to end	Night	12% 7% 21% 34% 24% 2	836
November	1st to 10th	Night	13% 7% 21% 36% 20% 2	780
	11th to 20th	Night	17% 10% 27% 32% 13% 1	800
	21st to end	Night	16% 9% 27% 31% 15% 1	800
December	1st to 10th	Night	17% 11% 30% 30% 12% 1	800
	11th to 20th	Night	20% 10% 27% 31% 11% 1	800
	21st to end	Night	24% 11% 28% 27% 10%	880

Page generated at 2025-09-16 01:49:11. Version ac07

Copyright © 2025 Attilla Danko.