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 2024-11-05.

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 7% 5% 5% 5% 4 7% 8% 39%	101115
	Night	12% 6% 2 6% 4 4 5% 4 6% 8% 43%	97877
Transparency	Day	41% 6% 13% 18% 16% 7%	104831
	Night	38% 6% 13% 19% 17% 8%	102300
Seeing	Day	16% 8% 24% 25% 18% 8%	15407
	Night	15% 8% 22% 32% 20% 3	25463

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% 5% 2 6% 5% 5% 6% 4 5% 6% 45%	2836
	11th to 20th	Day	12% 7% 2 5% 4 3 4 3 5% 8% 48%	2840
	21st to end	Day	14% 7% 2 7% 4 4 4 3 5% 6% 45%	3124
February	1st to 10th	Day	15% 8% 3 5% 5% 4 5% 3 6% 7% 39%	1790
	11th to 20th	Day	18% 6% 2 5% 3 3 3 2 5% 5% 47%	1848
	21st to end	Day	13% 6% 3 5% 5% 3 3 3 5% 7% 46%	1642
March	1st to 10th	Day	20% 9% 2 7% 4 4 4 3 6% 5% 35%	3435
	11th to 20th	Day	7% 5% 1 5% 4 4 4 4 6% 8% 54%	3480
	21st to end	Day	16% 7% 2 5% 4 4 4 3 5% 6% 44%	3815
April	1st to 10th	Day	9% 5% 1 5% 5% 4 5% 4 5% 6% 50%	2090
	11th to 20th	Day	12% 5% 2 6% 4 4 4 3 5% 8% 48%	2192
	21st to end	Day	5% 5% 2 4 4 4 5% 4 6% 8% 53%	2349
May	1st to 10th	Day	7% 4 2 6% 5% 5% 6% 5% 7% 9% 44%	4082
	11th to 20th	Day	14% 7% 3 7% 5% 5% 5% 3 6% 7% 38%	4081
	21st to end	Day	6% 4 2 6% 4 5% 5% 4 7% 10% 47%	4476
June	1st to 10th	Day	9% 7% 3 8% 7% 6% 7% 7% 8% 10% 30%	2470
	11th to 20th	Day	6% 4 2 6% 6% 8% 7% 5% 8% 12% 35%	2470
	21st to end	Day	7% 6% 2 8% 7% 7% 8% 6% 10% 10% 29%	2470
July	1st to 10th	Day	13% 8% 4 9% 7% 6% 6% 6% 9% 10% 21%	4120
	11th to 20th	Day	5% 4 2 9% 8% 8% 10% 8% 10% 13% 23%	4120
	21st to end	Day	6% 6% 3 10% 9% 9% 9% 7% 10% 12% 19%	4466
August	1st to 10th	Day	20% 6% 3 8% 7% 7% 6% 6% 8% 9% 19%	4104
	11th to 20th	Day	6% 5% 2 7% 6% 7% 7% 7% 9% 12% 31%	4044
	21st to end	Day	10% 7% 3 9% 6% 7% 7% 6% 8% 10% 29%	4055
September	1st to 10th	Day	10% 7% 3 8% 6% 8% 8% 5% 7% 8% 30%	2090
	11th to 20th	Day	13% 8% 4 8% 6% 6% 6% 4 6% 7% 33%	2090
	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% 5% 2 5% 4 3 4 3 5% 6% 52%	1898
	11th to 20th	Day	12% 8% 2 4 3 2 3 4 4 6% 51%	1853
	21st to end	Day	14% 6% 1 5% 4 3 4 2 4 7% 49%	1710
December	1st to 10th	Day	12% 6% 3 6% 4 5% 5% 4 6% 6% 43%	1710
	11th to 20th	Day	16% 6% 2 4 3 3 4 2 4 6% 49%	2153
	21st to end	Day	17% 10% 3 5% 3 3 3 3 4 5% 43%	3124
January	1st to 10th	Night	15% 6% 2 5% 4 5% 5% 4 5% 6% 43%	4109
	11th to 20th	Night	9% 7% 2 6% 5% 4 4 3 7% 7% 45%	4120
	21st to end	Night	14% 9% 3 7% 4 3 4 2 4 5% 43%	4532
February	1st to 10th	Night	15% 8% 3 6% 4 4 4 3 4 6% 43%	2387
	11th to 20th	Night	17% 7% 2 5% 4 3 3 3 5% 5% 46%	2218
	21st to end	Night	11% 6% 2 6% 5% 5% 4 4 5% 6% 46%	1810
March	1st to 10th	Night	21% 12% 4 7% 4 3 4 3 4 5% 35%	3418
	11th to 20th	Night	10% 5% 2 5% 4 4 4 3 6% 7% 50%	3480
	21st to end	Night	15% 6% 2 6% 3 4 4 3 5% 7% 46%	3817
April	1st to 10th	Night	10% 5% 2 4 4 4 4 4 6% 6% 50%	2090
	11th to 20th	Night	11% 5% 2 5% 3 3 3 3 5% 7% 52%	1934
	21st to end	Night	7% 4 2 4 4 3 4 4 6% 8% 54%	1845
May	1st to 10th	Night	5% 5% 2 6% 5% 4 4 4 7% 12% 47%	2813
	11th to 20th	Night	10% 5% 2 7% 4 4 5% 4 6% 9% 43%	2812
	21st to end	Night	8% 4 2 4 4 4 4 4 6% 8% 52%	3079
June	1st to 10th	Night	9% 6% 2 7% 5% 6% 5% 5% 9% 13% 34%	1710
	11th to 20th	Night	7% 5% 2 7% 5% 5% 5% 5% 9% 13% 38%	1710
	21st to end	Night	6% 4 2 6% 5% 7% 7% 6% 11% 13% 33%	1710
July	1st to 10th	Night	10% 8% 3 9% 6% 6% 5% 6% 8% 11% 28%	2840
	11th to 20th	Night	5% 5% 2 8% 7% 7% 8% 6% 11% 14% 28%	2840
	21st to end	Night	7% 7% 3 9% 7% 7% 7% 6% 9% 11% 25%	3087
August	1st to 10th	Night	18% 6% 3 7% 5% 6% 6% 5% 9% 11% 24%	2825
	11th to 20th	Night	6% 5% 2 7% 5% 6% 6% 6% 9% 10% 38%	2785
	21st to end	Night	7% 5% 2 7% 5% 5% 5% 4 7% 10% 43%	3560
September	1st to 10th	Night	11% 7% 3 6% 6% 5% 5% 6% 7% 10% 34%	2090
	11th to 20th	Night	10% 7% 2 8% 5% 5% 4 5% 6% 9% 38%	2090
	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	11% 5% 2 5% 3 3 4 3 5% 6% 53%	2280
	11th to 20th	Night	14% 7% 2 5% 4 3 3 2 4 5% 51%	2323
	21st to end	Night	12% 5% 2 6% 5% 4 4 3 5% 7% 48%	2470
December	1st to 10th	Night	13% 6% 2 6% 4 4 4 4 6% 7% 43%	2470
	11th to 20th	Night	17% 6% 2 5% 4 4 3 3 3 5% 48%	3042
	21st to end	Night	17% 8% 3 6% 5% 4 4 3 5% 5% 39%	4532

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	37% 6% 7% 17% 21% 12%	2837
	11th to 20th	Day	36% 3 7% 19% 25% 10%	2840
	21st to end	Day	40% 4 8% 15% 21% 12%	3124
February	1st to 10th	Day	44% 4 9% 16% 19% 8%	1790
	11th to 20th	Day	40% 3 7% 15% 26% 9%	1858
	21st to end	Day	38% 4 8% 19% 21% 11%	1642
March	1st to 10th	Day	49% 5% 7% 17% 15% 8%	3435
	11th to 20th	Day	29% 4 11% 18% 23% 15%	3480
	21st to end	Day	42% 4 7% 19% 20% 8%	3815
April	1st to 10th	Day	33% 4 10% 21% 19% 11%	2090
	11th to 20th	Day	35% 4 9% 20% 21% 11%	2192
	21st to end	Day	27% 5% 10% 27% 24% 7%	2349
May	1st to 10th	Day	34% 7% 13% 27% 15% 4	4120
	11th to 20th	Day	44% 6% 12% 21% 16% 2	4085
	21st to end	Day	30% 7% 17% 23% 22% 1	4489
June	1st to 10th	Day	45% 9% 16% 17% 12% 1	2470
	11th to 20th	Day	39% 9% 16% 25% 11% 1	2470
	21st to end	Day	44% 10% 19% 17% 9% 1	2470
July	1st to 10th	Day	53% 7% 21% 16% 3 1	4055
	11th to 20th	Day	47% 10% 29% 11% 3	4051
	21st to end	Day	52% 11% 23% 11% 2 1	4324
August	1st to 10th	Day	57% 6% 23% 10% 2	4091
	11th to 20th	Day	41% 7% 19% 23% 9%	4083
	21st to end	Day	49% 6% 15% 26% 5%	4055
September	1st to 10th	Day	48% 8% 15% 12% 12% 4	2090
	11th to 20th	Day	48% 7% 12% 17% 12% 3	2090
	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	34% 3 9% 17% 23% 14%	1898
	11th to 20th	Day	35% 3 7% 19% 23% 13%	1853
	21st to end	Day	37% 3 8% 23% 21% 9%	1710
December	1st to 10th	Day	40% 5% 11% 19% 16% 9%	1710
	11th to 20th	Day	37% 3 6% 20% 28% 6%	2150
	21st to end	Day	45% 3 6% 18% 24% 4	3124
January	1st to 10th	Night	40% 4 7% 14% 21% 13%	4109
	11th to 20th	Night	38% 4 6% 17% 26% 9%	4120
	21st to end	Night	44% 4 8% 11% 23% 11%	4532
February	1st to 10th	Night	42% 4 8% 18% 19% 9%	2387
	11th to 20th	Night	40% 3 8% 16% 21% 12%	2219
	21st to end	Night	39% 4 9% 19% 16% 13%	1810
March	1st to 10th	Night	52% 4 10% 13% 14% 7%	3418
	11th to 20th	Night	33% 4 10% 16% 22% 15%	3480
	21st to end	Night	39% 4 11% 18% 19% 10%	3817
April	1st to 10th	Night	34% 5% 11% 19% 19% 11%	2090
	11th to 20th	Night	31% 4 9% 24% 20% 12%	1934
	21st to end	Night	27% 5% 13% 26% 23% 6%	1845
May	1st to 10th	Night	28% 8% 17% 29% 14% 4	2840
	11th to 20th	Night	37% 8% 14% 25% 15% 1	2813
	21st to end	Night	27% 7% 15% 30% 18% 3	3087
June	1st to 10th	Night	38% 10% 22% 21% 9% 1	1710
	11th to 20th	Night	34% 10% 22% 26% 7%	1710
	21st to end	Night	35% 13% 26% 19% 6% 1	1710
July	1st to 10th	Night	48% 8% 19% 21% 3 1	2795
	11th to 20th	Night	42% 10% 34% 11% 3	2786
	21st to end	Night	49% 14% 22% 13% 2	2988
August	1st to 10th	Night	51% 9% 27% 12% 2	2814
	11th to 20th	Night	36% 9% 25% 24% 6%	2812
	21st to end	Night	36% 6% 21% 33% 4	3560
September	1st to 10th	Night	42% 10% 20% 15% 11% 2	2090
	11th to 20th	Night	41% 7% 19% 18% 12% 3	2090
	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	33% 3 9% 16% 24% 15%	2280
	11th to 20th	Night	37% 2 7% 18% 23% 13%	2323
	21st to end	Night	38% 3 8% 20% 21% 9%	2470
December	1st to 10th	Night	39% 5% 14% 17% 19% 6%	2470
	11th to 20th	Night	40% 3 7% 17% 26% 7%	3044
	21st to end	Night	46% 4 6% 18% 21% 4	4532

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% 21% 50% 8% 3	270
	11th to 20th	Day	18% 17% 41% 16% 7% 1	270
	21st to end	Day	35% 20% 36% 8% 2	297
February	1st to 10th	Day	24% 18% 39% 16% 3	270
	11th to 20th	Day	30% 20% 35% 15%	270
	21st to end	Day	21% 19% 41% 15% 3	297
March	1st to 10th	Day	20% 16% 33% 20% 10% 1	460
	11th to 20th	Day	17% 17% 40% 18% 6% 2	460
	21st to end	Day	19% 18% 35% 18% 8% 1	506
April	1st to 10th	Day	21% 15% 31% 21% 10% 2	460
	11th to 20th	Day	16% 15% 30% 23% 11% 5%	452
	21st to end	Day	9% 12% 31% 26% 15% 6%	460
May	1st to 10th	Day	9% 14% 30% 28% 14% 6%	463
	11th to 20th	Day	13% 5% 28% 27% 19% 9%	487
	21st to end	Day	12% 4 19% 29% 24% 12%	529
June	1st to 10th	Day	12% 2 19% 29% 26% 12%	490
	11th to 20th	Day	7% 6% 17% 30% 23% 17%	490
	21st to end	Day	8% 3 14% 37% 26% 14%	490
July	1st to 10th	Day	9% 1 8% 26% 36% 20%	485
	11th to 20th	Day	10% 1 4 26% 38% 21%	484
	21st to end	Day	7% 3 8% 36% 33% 14%	532
August	1st to 10th	Day	13% 2 12% 30% 26% 17%	486
	11th to 20th	Day	9% 2 8% 29% 34% 19%	479
	21st to end	Day	15% 1 10% 28% 28% 18%	539
September	1st to 10th	Day	15% 2 10% 31% 30% 12%	490
	11th to 20th	Day	18% 1 16% 34% 23% 7%	490
	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	17% 7% 29% 28% 15% 4	472
	11th to 20th	Day	21% 9% 38% 22% 9% 1	413
	21st to end	Day	18% 10% 37% 26% 7% 1	270
December	1st to 10th	Day	21% 13% 39% 18% 9% 1	270
	11th to 20th	Day	22% 16% 33% 21% 7%	270
	21st to end	Day	30% 11% 31% 22% 6% 1	297
January	1st to 10th	Night	18% 16% 33% 27% 6%	760
	11th to 20th	Night	15% 15% 29% 32% 8% 1	760
	21st to end	Night	21% 15% 35% 24% 4	836
February	1st to 10th	Night	22% 12% 33% 27% 6%	760
	11th to 20th	Night	23% 14% 32% 25% 5%	743
	21st to end	Night	17% 15% 36% 27% 4	628
March	1st to 10th	Night	16% 12% 32% 33% 7%	760
	11th to 20th	Night	17% 13% 33% 28% 9% 1	760
	21st to end	Night	13% 15% 35% 28% 8%	836
April	1st to 10th	Night	15% 14% 35% 28% 8% 1	760
	11th to 20th	Night	14% 12% 31% 28% 14% 1	751
	21st to end	Night	10% 10% 30% 36% 14% 1	705
May	1st to 10th	Night	8% 7% 24% 41% 19% 1	570
	11th to 20th	Night	7% 5% 24% 38% 23% 3	561
	21st to end	Night	12% 1 12% 39% 31% 4	617
June	1st to 10th	Night	12% 1 12% 42% 29% 4	570
	11th to 20th	Night	8% 2 13% 33% 35% 9%	570
	21st to end	Night	6% 2 11% 39% 34% 7%	570
July	1st to 10th	Night	9% 1 7% 32% 42% 8%	555
	11th to 20th	Night	9% 1 3 33% 44% 10%	552
	21st to end	Night	8% 1 5% 39% 40% 6%	624
August	1st to 10th	Night	10% 6% 34% 40% 11%	567
	11th to 20th	Night	9% 1 4 31% 43% 11%	564
	21st to end	Night	14% 2 8% 31% 35% 11%	812
September	1st to 10th	Night	14% 2 8% 33% 37% 6%	760
	11th to 20th	Night	15% 1 11% 36% 32% 5%	760
	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% 37% 20% 2	760
	11th to 20th	Night	17% 10% 27% 33% 12% 1	760
	21st to end	Night	16% 8% 28% 31% 16% 1	760
December	1st to 10th	Night	18% 11% 28% 30% 12% 1	760
	11th to 20th	Night	19% 10% 27% 31% 12% 1	760
	21st to end	Night	24% 11% 28% 27% 11%	836

Page generated at 2024-11-03 02:11:21. Version ac07

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