Dingmans Ferry
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Dingmans Ferry clear sky chart from 2005-11-06 to 2024-01-15.

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	16% 7% 3 6% 6% 3 5% 5% 5% 7% 37%	74766
	Night	17% 7% 3 5% 5% 3 4 4 5% 7% 41%	75017
Transparency	Day	30% 38% 8% 14% 9% 1	74471
	Night	29% 38% 9% 15% 9% 1	74846
Seeing	Day	24% 17% 29% 18% 9% 3	13775
	Night	22% 16% 30% 23% 8% 1	23092

By Month

Percentage Cloud Cover NE (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	12% 8% 4 7% 6% 4 6% 4 6% 7% 38%	1517
	11th to 20th	Day	15% 10% 3 6% 7% 4 6% 5% 5% 7% 32%	1478
	21st to end	Day	12% 9% 3 6% 6% 4 6% 6% 6% 6% 36%	1754
February	1st to 10th	Day	17% 9% 2 6% 8% 3 6% 6% 5% 6% 32%	1620
	11th to 20th	Day	13% 9% 3 7% 6% 4 5% 4 5% 7% 38%	1701
	21st to end	Day	20% 10% 3 6% 6% 3 4 4 5% 5% 34%	1480
March	1st to 10th	Day	13% 8% 4 6% 7% 4 4 4 5% 7% 40%	1797
	11th to 20th	Day	14% 9% 4 7% 6% 3 5% 5% 5% 8% 35%	1947
	21st to end	Day	18% 9% 3 6% 5% 3 5% 4 4 6% 37%	2322
April	1st to 10th	Day	16% 9% 3 5% 5% 3 5% 6% 4 6% 38%	2160
	11th to 20th	Day	17% 7% 3 5% 5% 3 4 4 4 7% 40%	2134
	21st to end	Day	19% 6% 2 5% 5% 4 5% 5% 6% 6% 38%	2160
May	1st to 10th	Day	23% 7% 3 6% 5% 3 5% 5% 5% 6% 33%	2380
	11th to 20th	Day	19% 7% 3 5% 6% 4 5% 5% 5% 8% 35%	2478
	21st to end	Day	16% 5% 2 5% 5% 3 5% 4 6% 8% 39%	2725
June	1st to 10th	Day	16% 5% 3 6% 6% 4 6% 5% 6% 9% 35%	2520
	11th to 20th	Day	17% 7% 3 5% 6% 3 5% 6% 7% 8% 33%	2520
	21st to end	Day	14% 5% 2 6% 6% 4 5% 6% 5% 8% 39%	2520
July	1st to 10th	Day	12% 6% 2 6% 6% 4 6% 6% 7% 9% 36%	2520
	11th to 20th	Day	11% 5% 2 5% 5% 3 5% 6% 8% 9% 40%	2520
	21st to end	Day	12% 6% 3 6% 6% 3 6% 6% 6% 8% 38%	2744
August	1st to 10th	Day	12% 5% 2 7% 7% 5% 5% 7% 7% 8% 35%	2366
	11th to 20th	Day	12% 5% 3 7% 6% 4 5% 7% 7% 7% 35%	2139
	21st to end	Day	16% 6% 2 5% 5% 2 5% 5% 6% 8% 40%	2376
September	1st to 10th	Day	17% 5% 3 5% 5% 4 4 5% 5% 8% 40%	2160
	11th to 20th	Day	14% 5% 2 4 4 2 4 5% 4 7% 49%	2118
	21st to end	Day	17% 6% 3 6% 5% 3 4 4 6% 6% 40%	1980
October	1st to 10th	Day	21% 7% 2 5% 5% 3 4 3 5% 7% 39%	1821
	11th to 20th	Day	16% 6% 2 5% 5% 4 5% 5% 5% 8% 41%	1800
	21st to end	Day	23% 6% 2 5% 5% 3 5% 5% 5% 6% 35%	1872
November	1st to 10th	Day	14% 6% 2 4 4 3 3 3 4 6% 50%	1671
	11th to 20th	Day	18% 7% 3 4 4 2 3 4 5% 7% 42%	1710
	21st to end	Day	17% 7% 3 5% 5% 4 6% 4 5% 7% 38%	1558
December	1st to 10th	Day	17% 9% 4 7% 6% 3 4 4 5% 7% 33%	1520
	11th to 20th	Day	20% 9% 3 6% 4 3 4 4 6% 6% 35%	1906
	21st to end	Day	19% 12% 6% 9% 6% 4 6% 5% 5% 6% 24%	2772
January	1st to 10th	Night	13% 7% 3 5% 5% 3 5% 5% 5% 8% 41%	2649
	11th to 20th	Night	17% 8% 2 6% 6% 4 5% 4 6% 7% 36%	2588
	21st to end	Night	12% 8% 3 5% 5% 3 5% 5% 7% 7% 40%	2601
February	1st to 10th	Night	16% 9% 3 6% 5% 3 5% 4 5% 7% 38%	2340
	11th to 20th	Night	15% 7% 3 6% 6% 3 5% 5% 6% 7% 37%	2144
	21st to end	Night	18% 8% 3 6% 5% 3 4 4 5% 6% 38%	1776
March	1st to 10th	Night	16% 6% 3 6% 4 3 4 4 5% 7% 42%	2150
	11th to 20th	Night	17% 6% 3 5% 4 3 4 4 5% 7% 42%	2010
	21st to end	Night	16% 7% 2 6% 4 2 4 5% 6% 7% 39%	2034
April	1st to 10th	Night	16% 7% 4 7% 7% 4 5% 5% 5% 7% 35%	1800
	11th to 20th	Night	18% 6% 2 5% 4 4 5% 5% 5% 7% 40%	1775
	21st to end	Night	20% 7% 3 4 4 3 4 4 4 7% 39%	1800
May	1st to 10th	Night	23% 8% 3 6% 5% 2 4 4 5% 6% 34%	1594
	11th to 20th	Night	18% 6% 2 5% 5% 3 4 5% 5% 7% 40%	1415
	21st to end	Night	15% 4 2 5% 6% 3 5% 5% 5% 8% 42%	1550
June	1st to 10th	Night	18% 5% 2 5% 5% 3 4 4 4 8% 43%	1440
	11th to 20th	Night	15% 5% 2 4 4 3 5% 6% 5% 8% 42%	1440
	21st to end	Night	12% 4 1 4 4 3 4 5% 7% 9% 47%	1440
July	1st to 10th	Night	11% 5% 2 6% 5% 3 5% 5% 6% 8% 43%	1440
	11th to 20th	Night	11% 5% 2 4 4 3 5% 6% 6% 10% 43%	1440
	21st to end	Night	13% 4 2 3 4 3 4 6% 6% 9% 46%	1574
August	1st to 10th	Night	11% 4 2 5% 4 3 5% 6% 7% 10% 44%	1568
	11th to 20th	Night	13% 6% 2 5% 6% 3 5% 6% 6% 8% 39%	1743
	21st to end	Night	16% 4 2 4 6% 3 3 4 6% 8% 44%	1980
September	1st to 10th	Night	16% 6% 2 4 4 3 4 4 5% 7% 46%	1800
	11th to 20th	Night	14% 5% 2 4 4 2 3 3 4 6% 53%	1840
	21st to end	Night	16% 5% 2 5% 4 2 3 5% 5% 6% 45%	1980
October	1st to 10th	Night	23% 5% 2 4 4 2 3 4 4 5% 44%	2136
	11th to 20th	Night	19% 5% 2 5% 4 2 3 4 4 5% 47%	2160
	21st to end	Night	22% 8% 2 4 3 2 3 4 5% 7% 41%	2484
November	1st to 10th	Night	14% 6% 2 4 4 3 4 4 4 6% 49%	2407
	11th to 20th	Night	19% 6% 3 4 4 3 4 3 5% 6% 44%	2470
	21st to end	Night	14% 6% 2 5% 5% 3 4 5% 5% 8% 43%	2617
December	1st to 10th	Night	19% 6% 3 6% 5% 3 5% 5% 6% 7% 35%	2660
	11th to 20th	Night	18% 8% 2 4 6% 3 5% 5% 5% 7% 36%	3288
	21st to end	Night	21% 10% 4 7% 5% 3 4 4 5% 6% 32%	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	28% 41% 9% 18% 4	1518
	11th to 20th	Day	32% 42% 10% 10% 5% 1	1478
	21st to end	Day	30% 37% 8% 16% 7% 1	1754
February	1st to 10th	Day	34% 36% 7% 13% 9% 1	1620
	11th to 20th	Day	33% 38% 6% 13% 9% 1	1710
	21st to end	Day	35% 36% 7% 14% 7% 2	1480
March	1st to 10th	Day	28% 36% 10% 16% 8% 2	1800
	11th to 20th	Day	33% 37% 7% 13% 9% 1	1947
	21st to end	Day	32% 37% 6% 13% 11% 2	2322
April	1st to 10th	Day	29% 38% 7% 14% 9% 3	2160
	11th to 20th	Day	31% 37% 7% 14% 8% 3	2134
	21st to end	Day	29% 38% 6% 13% 10% 3	2160
May	1st to 10th	Day	32% 37% 6% 13% 10% 2	2380
	11th to 20th	Day	31% 38% 6% 12% 10% 2	2482
	21st to end	Day	27% 39% 10% 13% 10% 2	2725
June	1st to 10th	Day	29% 39% 10% 13% 8% 1	2520
	11th to 20th	Day	32% 38% 9% 14% 5% 1	2520
	21st to end	Day	28% 39% 10% 16% 6%	2520
July	1st to 10th	Day	29% 40% 8% 15% 8% 1	2450
	11th to 20th	Day	24% 39% 12% 16% 8% 1	2445
	21st to end	Day	27% 41% 8% 13% 10% 1	2591
August	1st to 10th	Day	29% 39% 10% 14% 9%	2352
	11th to 20th	Day	29% 38% 9% 15% 9% 1	2139
	21st to end	Day	31% 38% 7% 13% 10% 2	2376
September	1st to 10th	Day	29% 37% 7% 14% 11% 2	2160
	11th to 20th	Day	22% 37% 8% 16% 15% 2	2118
	21st to end	Day	31% 37% 6% 12% 13% 1	1980
October	1st to 10th	Day	29% 37% 8% 15% 10%	1821
	11th to 20th	Day	28% 38% 9% 16% 8% 1	1800
	21st to end	Day	33% 38% 7% 13% 8% 1	1872
November	1st to 10th	Day	20% 41% 8% 16% 12% 2	1671
	11th to 20th	Day	28% 40% 8% 15% 7% 1	1710
	21st to end	Day	29% 41% 8% 15% 6%	1558
December	1st to 10th	Day	32% 40% 11% 11% 5%	1520
	11th to 20th	Day	34% 33% 13% 15% 5%	1906
	21st to end	Day	47% 28% 9% 11% 5%	2772
January	1st to 10th	Night	27% 41% 10% 15% 7%	2649
	11th to 20th	Night	31% 41% 9% 13% 4 1	2588
	21st to end	Night	27% 38% 9% 17% 9% 1	2601
February	1st to 10th	Night	31% 37% 9% 13% 9% 1	2340
	11th to 20th	Night	30% 38% 9% 13% 8% 2	2146
	21st to end	Night	32% 36% 6% 16% 9% 1	1776
March	1st to 10th	Night	26% 37% 12% 17% 7% 1	2160
	11th to 20th	Night	31% 36% 10% 15% 7% 1	2011
	21st to end	Night	27% 37% 8% 14% 11% 3	2034
April	1st to 10th	Night	31% 38% 8% 13% 9% 2	1800
	11th to 20th	Night	31% 38% 6% 14% 11% 1	1775
	21st to end	Night	29% 38% 8% 12% 11% 3	1800
May	1st to 10th	Night	33% 37% 6% 11% 11% 2	1594
	11th to 20th	Night	28% 37% 9% 12% 12% 2	1416
	21st to end	Night	24% 39% 12% 15% 9% 2	1551
June	1st to 10th	Night	28% 38% 9% 15% 9% 1	1440
	11th to 20th	Night	27% 38% 11% 17% 6% 1	1440
	21st to end	Night	21% 40% 12% 20% 7%	1440
July	1st to 10th	Night	27% 40% 11% 13% 8% 1	1400
	11th to 20th	Night	23% 41% 10% 16% 8% 1	1392
	21st to end	Night	20% 41% 13% 14% 11% 1	1486
August	1st to 10th	Night	22% 40% 12% 16% 9%	1558
	11th to 20th	Night	28% 39% 10% 14% 9%	1743
	21st to end	Night	29% 38% 9% 12% 11% 1	1980
September	1st to 10th	Night	26% 38% 8% 16% 11% 1	1800
	11th to 20th	Night	23% 36% 7% 17% 16% 1	1840
	21st to end	Night	27% 36% 8% 15% 14%	1980
October	1st to 10th	Night	28% 37% 7% 16% 11%	2136
	11th to 20th	Night	29% 37% 9% 17% 8% 1	2160
	21st to end	Night	29% 37% 10% 15% 8% 1	2484
November	1st to 10th	Night	20% 41% 9% 14% 14% 2	2407
	11th to 20th	Night	28% 40% 7% 15% 9% 2	2470
	21st to end	Night	25% 40% 10% 17% 7%	2617
December	1st to 10th	Night	29% 41% 9% 14% 6% 1	2660
	11th to 20th	Night	33% 34% 10% 12% 10% 1	3288
	21st to end	Night	42% 28% 11% 15% 4	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	38% 23% 26% 11% 1 1	180
	11th to 20th	Day	41% 24% 28% 6% 2	170
	21st to end	Day	26% 35% 28% 8% 2 2	252
February	1st to 10th	Day	38% 31% 25% 5% 1	240
	11th to 20th	Day	34% 29% 31% 5% 1	369
	21st to end	Day	38% 26% 26% 9% 1	346
March	1st to 10th	Day	30% 24% 33% 12% 2	420
	11th to 20th	Day	28% 26% 31% 11% 3 1	420
	21st to end	Day	33% 24% 28% 9% 4 2	462
April	1st to 10th	Day	31% 26% 26% 12% 4	420
	11th to 20th	Day	27% 24% 27% 14% 7% 1	412
	21st to end	Day	31% 20% 32% 11% 4 2	420
May	1st to 10th	Day	32% 22% 26% 12% 7% 2	423
	11th to 20th	Day	23% 19% 33% 17% 6% 2	447
	21st to end	Day	19% 12% 28% 25% 14% 3	485
June	1st to 10th	Day	20% 14% 32% 22% 10% 2	450
	11th to 20th	Day	20% 18% 24% 25% 12% 1	450
	21st to end	Day	16% 14% 32% 25% 10% 2	450
July	1st to 10th	Day	15% 10% 29% 24% 17% 6%	445
	11th to 20th	Day	12% 6% 28% 32% 20% 3	444
	21st to end	Day	15% 8% 35% 28% 11% 3	488
August	1st to 10th	Day	11% 7% 29% 28% 18% 6%	446
	11th to 20th	Day	15% 6% 25% 32% 18% 5%	439
	21st to end	Day	16% 10% 30% 24% 13% 7%	495
September	1st to 10th	Day	22% 10% 26% 21% 15% 7%	450
	11th to 20th	Day	14% 10% 30% 20% 15% 10%	450
	21st to end	Day	22% 11% 30% 21% 11% 5%	450
October	1st to 10th	Day	29% 10% 23% 21% 12% 5%	450
	11th to 20th	Day	21% 19% 29% 22% 7% 1	450
	21st to end	Day	29% 17% 30% 16% 6% 1	441
November	1st to 10th	Day	22% 17% 27% 22% 9% 2	365
	11th to 20th	Day	28% 23% 29% 16% 4 1	370
	21st to end	Day	28% 24% 32% 14% 2 1	218
December	1st to 10th	Day	31% 29% 27% 9% 4 1	180
	11th to 20th	Day	38% 28% 24% 7% 3	180
	21st to end	Day	33% 24% 29% 10% 4	198
January	1st to 10th	Night	22% 26% 37% 12% 3	760
	11th to 20th	Night	27% 21% 33% 17% 2	740
	21st to end	Night	19% 28% 36% 15% 2	792
February	1st to 10th	Night	27% 22% 35% 15% 1	720
	11th to 20th	Night	25% 30% 35% 10% 1	703
	21st to end	Night	32% 24% 29% 13% 2	592
March	1st to 10th	Night	27% 23% 33% 14% 3	720
	11th to 20th	Night	26% 24% 30% 17% 3	720
	21st to end	Night	22% 25% 33% 15% 5% 1	792
April	1st to 10th	Night	22% 24% 32% 20% 3	720
	11th to 20th	Night	23% 19% 32% 21% 5%	711
	21st to end	Night	26% 17% 31% 21% 4	720
May	1st to 10th	Night	27% 14% 29% 23% 7%	514
	11th to 20th	Night	22% 10% 37% 25% 6% 1	354
	21st to end	Night	16% 7% 27% 36% 13%	389
June	1st to 10th	Night	18% 7% 26% 35% 14%	360
	11th to 20th	Night	15% 8% 32% 33% 12%	360
	21st to end	Night	12% 4 29% 43% 10% 1	360
July	1st to 10th	Night	13% 4 25% 40% 17% 2	350
	11th to 20th	Night	12% 3 25% 43% 16% 1	348
	21st to end	Night	14% 5% 23% 42% 15% 1	394
August	1st to 10th	Night	13% 3 23% 39% 19% 2	494
	11th to 20th	Night	15% 4 19% 37% 22% 2	679
	21st to end	Night	16% 5% 22% 34% 21% 2	792
September	1st to 10th	Night	18% 6% 27% 30% 17% 2	720
	11th to 20th	Night	17% 6% 27% 27% 19% 5%	720
	21st to end	Night	20% 8% 25% 29% 16% 2	720
October	1st to 10th	Night	26% 10% 23% 25% 15% 1	720
	11th to 20th	Night	22% 14% 29% 28% 7%	720
	21st to end	Night	29% 15% 30% 20% 6%	792
November	1st to 10th	Night	18% 20% 29% 24% 9% 1	740
	11th to 20th	Night	26% 19% 28% 19% 6% 1	760
	21st to end	Night	21% 22% 32% 20% 5% 1	760
December	1st to 10th	Night	25% 21% 34% 15% 4	760
	11th to 20th	Night	25% 22% 33% 18% 3	760
	21st to end	Night	26% 22% 33% 16% 3	836

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