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 2026-03-18.

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	17% 7% 3 6% 4 4 5% 4 5% 7% 37%	131297
	Night	16% 7% 2 6% 4 4 4 4 5% 7% 40%	130185
Transparency	Day	44% 7% 12% 21% 14% 2	134811
	Night	43% 6% 13% 21% 15% 2	134758
Seeing	Day	25% 18% 28% 18% 8% 2	16567
	Night	22% 17% 29% 23% 8% 1	25881

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	11% 9% 3 9% 5% 5% 5% 3 5% 7% 37%	4661
	11th to 20th	Day	13% 12% 4 11% 5% 4 4 3 4 6% 35%	4650
	21st to end	Day	14% 8% 3 5% 4 4 5% 5% 6% 6% 40%	5696
February	1st to 10th	Day	15% 9% 2 8% 6% 5% 5% 5% 5% 6% 35%	1890
	11th to 20th	Day	13% 10% 4 8% 5% 5% 4 3 5% 6% 37%	1994
	21st to end	Day	18% 10% 3 7% 6% 4 4 3 5% 5% 36%	1730
March	1st to 10th	Day	20% 8% 3 6% 4 4 4 3 4 5% 39%	4576
	11th to 20th	Day	12% 7% 3 8% 5% 4 4 4 6% 7% 40%	4980
	21st to end	Day	18% 9% 2 5% 4 4 4 3 5% 6% 40%	5832
April	1st to 10th	Day	17% 11% 3 6% 5% 4 5% 4 4 6% 36%	2400
	11th to 20th	Day	17% 8% 2 6% 4 4 4 4 5% 7% 38%	2374
	21st to end	Day	17% 6% 2 6% 5% 5% 4 4 6% 6% 38%	2400
May	1st to 10th	Day	29% 6% 2 5% 4 4 4 4 5% 7% 29%	6010
	11th to 20th	Day	23% 8% 2 7% 4 4 4 4 5% 6% 32%	6318
	21st to end	Day	22% 6% 2 5% 4 4 5% 4 7% 9% 33%	6949
June	1st to 10th	Day	16% 5% 3 7% 5% 6% 5% 4 6% 9% 36%	2800
	11th to 20th	Day	17% 7% 2 6% 5% 4 5% 4 6% 8% 34%	2800
	21st to end	Day	14% 6% 2 7% 5% 5% 5% 4 6% 9% 38%	2800
July	1st to 10th	Day	10% 6% 2 7% 5% 5% 6% 5% 7% 10% 37%	6360
	11th to 20th	Day	11% 6% 2 6% 5% 6% 6% 6% 8% 11% 33%	6360
	21st to end	Day	13% 6% 2 6% 4 4 5% 4 6% 8% 41%	6926
August	1st to 10th	Day	22% 5% 2 7% 5% 5% 4 4 6% 7% 32%	4303
	11th to 20th	Day	14% 5% 3 6% 4 4 5% 5% 7% 9% 39%	3864
	21st to end	Day	15% 5% 2 5% 3 3 4 4 6% 8% 45%	4312
September	1st to 10th	Day	16% 6% 2 6% 4 4 4 4 5% 8% 41%	2400
	11th to 20th	Day	13% 5% 2 5% 4 3 4 4 4 7% 50%	2352
	21st to end	Day	19% 6% 2 7% 4 4 4 3 6% 6% 38%	2200
October	1st to 10th	Day	19% 7% 2 6% 4 4 4 3 5% 7% 41%	2023
	11th to 20th	Day	15% 6% 2 6% 4 4 5% 4 5% 7% 42%	2000
	21st to end	Day	21% 5% 2 5% 5% 4 4 4 5% 6% 39%	2080
November	1st to 10th	Day	13% 7% 2 5% 4 4 3 2 4 5% 50%	1851
	11th to 20th	Day	16% 8% 2 5% 4 4 4 3 5% 8% 42%	1890
	21st to end	Day	17% 8% 2 6% 5% 5% 6% 3 5% 6% 36%	1722
December	1st to 10th	Day	14% 9% 3 7% 5% 4 5% 3 5% 6% 39%	2680
	11th to 20th	Day	21% 10% 2 5% 4 3 4 3 5% 5% 39%	3066
	21st to end	Day	17% 10% 4 9% 4 4 5% 3 5% 7% 31%	4048
January	1st to 10th	Night	11% 8% 3 9% 6% 6% 6% 5% 6% 7% 34%	8234
	11th to 20th	Night	13% 9% 3 11% 5% 5% 4 3 5% 6% 35%	8235
	21st to end	Night	13% 8% 2 6% 5% 4 5% 4 5% 6% 42%	8484
February	1st to 10th	Night	15% 9% 3 6% 5% 5% 4 3 5% 7% 39%	2730
	11th to 20th	Night	15% 8% 3 7% 5% 4 5% 4 6% 6% 37%	2511
	21st to end	Night	17% 9% 2 7% 4 4 4 4 5% 5% 39%	2076
March	1st to 10th	Night	19% 8% 3 6% 4 4 4 3 5% 6% 40%	5484
	11th to 20th	Night	13% 7% 3 6% 4 3 4 3 5% 7% 45%	5118
	21st to end	Night	15% 9% 3 7% 4 4 4 3 5% 5% 41%	5086
April	1st to 10th	Night	16% 9% 3 8% 6% 5% 5% 4 5% 6% 34%	2000
	11th to 20th	Night	19% 7% 2 5% 4 4 5% 4 5% 6% 39%	1975
	21st to end	Night	19% 7% 3 4 3 4 4 4 5% 7% 40%	2000
May	1st to 10th	Night	31% 7% 3 6% 3 3 4 3 5% 7% 28%	3958
	11th to 20th	Night	24% 8% 3 6% 4 4 4 3 5% 6% 34%	3575
	21st to end	Night	22% 6% 2 6% 4 4 5% 4 5% 8% 35%	3926
June	1st to 10th	Night	18% 5% 2 6% 4 3 4 3 4 8% 43%	1600
	11th to 20th	Night	16% 5% 2 4 4 4 5% 5% 5% 9% 42%	1600
	21st to end	Night	12% 4 1 5% 4 4 4 4 7% 9% 46%	1600
July	1st to 10th	Night	12% 6% 2 7% 5% 4 5% 4 6% 8% 41%	3600
	11th to 20th	Night	14% 6% 3 5% 5% 5% 5% 5% 7% 9% 36%	3600
	21st to end	Night	14% 5% 1 4 3 3 4 4 5% 7% 50%	3926
August	1st to 10th	Night	21% 5% 2 6% 3 4 4 4 6% 8% 36%	2842
	11th to 20th	Night	15% 7% 2 6% 4 4 4 4 5% 6% 43%	3151
	21st to end	Night	14% 4 1 4 3 3 3 3 5% 8% 52%	3586
September	1st to 10th	Night	15% 6% 2 5% 3 3 4 3 5% 7% 48%	2000
	11th to 20th	Night	13% 6% 2 4 4 3 3 2 4 6% 53%	2046
	21st to end	Night	18% 6% 2 6% 4 3 3 4 5% 6% 43%	2200
October	1st to 10th	Night	21% 6% 2 5% 3 3 3 3 4 5% 46%	2374
	11th to 20th	Night	18% 6% 1 5% 3 3 3 4 4 5% 48%	2400
	21st to end	Night	21% 7% 2 4 3 3 3 3 6% 7% 42%	2760
November	1st to 10th	Night	13% 6% 2 5% 3 3 4 3 5% 7% 49%	2667
	11th to 20th	Night	18% 6% 3 5% 3 4 3 3 5% 6% 44%	2730
	21st to end	Night	14% 7% 2 6% 4 4 4 4 5% 7% 42%	2893
December	1st to 10th	Night	13% 6% 3 7% 4 4 4 4 5% 7% 42%	4720
	11th to 20th	Night	23% 8% 2 5% 4 4 4 3 4 5% 38%	5348
	21st to end	Night	19% 11% 4 8% 4 4 4 3 4 5% 33%	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	46% 5% 15% 21% 12% 2	4662
	11th to 20th	Day	51% 4 11% 17% 12% 5%	4680
	21st to end	Day	43% 5% 13% 23% 15% 1	5696
February	1st to 10th	Day	49% 6% 12% 19% 12% 2	1890
	11th to 20th	Day	48% 6% 9% 21% 14% 1	2003
	21st to end	Day	49% 5% 11% 22% 10% 2	1730
March	1st to 10th	Day	48% 4 11% 18% 13% 6%	4579
	11th to 20th	Day	40% 8% 16% 25% 8% 4	4980
	21st to end	Day	45% 5% 11% 11% 23% 5%	5832
April	1st to 10th	Day	48% 7% 10% 20% 13% 4	2400
	11th to 20th	Day	45% 6% 11% 21% 15% 2	2374
	21st to end	Day	45% 7% 10% 21% 14% 4	2400
May	1st to 10th	Day	54% 7% 13% 15% 9% 1	6021
	11th to 20th	Day	51% 7% 9% 21% 11% 1	6322
	21st to end	Day	45% 8% 13% 21% 12% 1	6949
June	1st to 10th	Day	45% 9% 12% 19% 14% 1	2800
	11th to 20th	Day	46% 8% 13% 21% 11% 2	2800
	21st to end	Day	41% 9% 13% 23% 12% 1	2800
July	1st to 10th	Day	41% 10% 12% 22% 14% 1	6290
	11th to 20th	Day	41% 10% 17% 22% 10%	6285
	21st to end	Day	41% 6% 12% 21% 19% 1	6728
August	1st to 10th	Day	50% 8% 13% 19% 9%	4289
	11th to 20th	Day	40% 8% 15% 27% 10%	3900
	21st to end	Day	36% 6% 13% 31% 13% 1	4312
September	1st to 10th	Day	41% 7% 12% 22% 17% 1	2400
	11th to 20th	Day	34% 7% 10% 23% 24% 2	2352
	21st to end	Day	46% 6% 10% 18% 17% 2	2200
October	1st to 10th	Day	41% 5% 10% 19% 21% 3	3296
	11th to 20th	Day	34% 5% 9% 27% 20% 5%	3240
	21st to end	Day	30% 5% 16% 26% 19% 3	3344
November	1st to 10th	Day	37% 6% 13% 24% 18% 3	1851
	11th to 20th	Day	41% 6% 11% 23% 15% 3	1890
	21st to end	Day	48% 7% 13% 23% 8% 1	1722
December	1st to 10th	Day	46% 5% 15% 23% 9% 1	2680
	11th to 20th	Day	48% 5% 14% 20% 11% 1	3066
	21st to end	Day	52% 6% 11% 16% 13% 1	4048
January	1st to 10th	Night	46% 6% 14% 20% 12% 2	8234
	11th to 20th	Night	48% 5% 14% 17% 12% 4	8280
	21st to end	Night	42% 5% 12% 20% 19% 3	8484
February	1st to 10th	Night	44% 7% 14% 22% 12% 2	2730
	11th to 20th	Night	46% 7% 13% 19% 14% 2	2513
	21st to end	Night	46% 5% 11% 21% 14% 3	2076
March	1st to 10th	Night	45% 5% 13% 19% 13% 5%	5494
	11th to 20th	Night	37% 7% 18% 23% 10% 4	5119
	21st to end	Night	44% 6% 8% 16% 22% 3	5086
April	1st to 10th	Night	50% 7% 11% 17% 13% 3	2000
	11th to 20th	Night	45% 7% 9% 22% 16% 1	1975
	21st to end	Night	42% 7% 11% 20% 16% 3	2000
May	1st to 10th	Night	55% 7% 12% 16% 9% 1	3964
	11th to 20th	Night	49% 9% 12% 16% 12% 1	3576
	21st to end	Night	45% 9% 14% 21% 10% 1	3927
June	1st to 10th	Night	41% 7% 11% 24% 17% 1	1600
	11th to 20th	Night	39% 9% 16% 25% 11% 1	1600
	21st to end	Night	33% 9% 17% 28% 13% 1	1600
July	1st to 10th	Night	40% 8% 16% 19% 16% 1	3560
	11th to 20th	Night	43% 9% 14% 22% 11% 1	3552
	21st to end	Night	33% 6% 13% 27% 20% 1	3809
August	1st to 10th	Night	45% 9% 16% 20% 8% 1	2832
	11th to 20th	Night	40% 7% 15% 27% 10%	3181
	21st to end	Night	32% 6% 12% 33% 17% 1	3586
September	1st to 10th	Night	37% 7% 12% 26% 18% 1	2000
	11th to 20th	Night	33% 6% 11% 24% 24% 2	2046
	21st to end	Night	41% 7% 10% 21% 19% 1	2200
October	1st to 10th	Night	40% 5% 12% 23% 19% 1	3881
	11th to 20th	Night	31% 4 10% 27% 24% 4	3899
	21st to end	Night	31% 5% 15% 29% 18% 2	4446
November	1st to 10th	Night	35% 6% 14% 22% 20% 3	2667
	11th to 20th	Night	42% 5% 12% 22% 17% 3	2730
	21st to end	Night	39% 8% 15% 26% 11% 1	2893
December	1st to 10th	Night	41% 6% 15% 30% 8% 1	4720
	11th to 20th	Night	49% 5% 13% 18% 14% 1	5348
	21st to end	Night	52% 6% 12% 16% 12% 2	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	39% 26% 24% 10% 1	220
	11th to 20th	Day	43% 27% 23% 5% 2	220
	21st to end	Day	29% 34% 27% 7% 2 1	347
February	1st to 10th	Day	34% 31% 26% 7% 2	330
	11th to 20th	Day	37% 28% 30% 5% 1	482
	21st to end	Day	35% 27% 27% 9% 2	446
March	1st to 10th	Day	33% 23% 31% 11% 2	540
	11th to 20th	Day	31% 25% 30% 11% 2 1	528
	21st to end	Day	33% 25% 28% 8% 4 1	550
April	1st to 10th	Day	35% 26% 25% 11% 4	500
	11th to 20th	Day	29% 26% 26% 12% 6% 1	492
	21st to end	Day	29% 21% 32% 12% 4 2	500
May	1st to 10th	Day	33% 22% 26% 11% 6% 2	503
	11th to 20th	Day	24% 19% 31% 17% 7% 2	527
	21st to end	Day	20% 12% 30% 24% 12% 2	573
June	1st to 10th	Day	21% 14% 31% 22% 10% 2	530
	11th to 20th	Day	21% 17% 24% 25% 12% 1	530
	21st to end	Day	17% 13% 32% 26% 10% 2	530
July	1st to 10th	Day	14% 9% 30% 26% 15% 5%	525
	11th to 20th	Day	12% 7% 29% 30% 19% 4	524
	21st to end	Day	15% 8% 34% 30% 10% 3	576
August	1st to 10th	Day	13% 7% 29% 28% 17% 6%	526
	11th to 20th	Day	14% 7% 24% 32% 18% 5%	519
	21st to end	Day	16% 10% 30% 24% 13% 7%	583
September	1st to 10th	Day	20% 10% 27% 21% 15% 6%	530
	11th to 20th	Day	13% 9% 29% 23% 17% 9%	530
	21st to end	Day	25% 11% 28% 21% 10% 4	530
October	1st to 10th	Day	27% 10% 23% 21% 13% 5%	530
	11th to 20th	Day	21% 21% 28% 21% 7% 2	530
	21st to end	Day	27% 17% 32% 17% 6% 1	517
November	1st to 10th	Day	23% 20% 27% 20% 8% 2	425
	11th to 20th	Day	28% 24% 29% 16% 3	430
	21st to end	Day	31% 27% 29% 11% 2 1	262
December	1st to 10th	Day	31% 28% 28% 9% 4	220
	11th to 20th	Day	40% 28% 21% 8% 2	220
	21st to end	Day	33% 23% 30% 10% 4	242
January	1st to 10th	Night	22% 27% 36% 12% 3	840
	11th to 20th	Night	29% 22% 32% 16% 2	840
	21st to end	Night	21% 29% 34% 14% 2	924
February	1st to 10th	Night	26% 23% 34% 16% 1	840
	11th to 20th	Night	27% 29% 35% 9%	823
	21st to end	Night	31% 24% 30% 13% 2	692
March	1st to 10th	Night	28% 24% 33% 14% 3	840
	11th to 20th	Night	27% 24% 29% 17% 3	829
	21st to end	Night	23% 26% 32% 15% 4 1	880
April	1st to 10th	Night	23% 24% 31% 19% 2	800
	11th to 20th	Night	25% 20% 31% 19% 5%	791
	21st to end	Night	25% 18% 31% 21% 5%	800
May	1st to 10th	Night	28% 14% 29% 22% 6%	569
	11th to 20th	Night	22% 10% 35% 25% 6% 1	394
	21st to end	Night	18% 8% 28% 35% 12%	433
June	1st to 10th	Night	19% 8% 26% 35% 13%	400
	11th to 20th	Night	16% 8% 32% 34% 11%	400
	21st to end	Night	13% 6% 30% 42% 10% 1	400
July	1st to 10th	Night	13% 5% 24% 41% 16% 2	390
	11th to 20th	Night	12% 5% 25% 43% 15% 1	388
	21st to end	Night	13% 5% 25% 41% 15% 1	438
August	1st to 10th	Night	14% 3 22% 40% 20% 2	550
	11th to 20th	Night	15% 5% 20% 38% 21% 2	756
	21st to end	Night	16% 5% 24% 33% 21% 1	880
September	1st to 10th	Night	18% 7% 26% 29% 18% 2	800
	11th to 20th	Night	16% 5% 25% 29% 21% 4	800
	21st to end	Night	21% 7% 24% 30% 15% 2	800
October	1st to 10th	Night	25% 10% 23% 25% 17% 1	800
	11th to 20th	Night	22% 15% 29% 27% 7%	800
	21st to end	Night	27% 15% 31% 21% 6%	880
November	1st to 10th	Night	19% 20% 30% 23% 8%	820
	11th to 20th	Night	27% 20% 27% 19% 5% 1	840
	21st to end	Night	23% 22% 30% 19% 5%	840
December	1st to 10th	Night	25% 21% 34% 15% 4	840
	11th to 20th	Night	26% 21% 33% 17% 3	840
	21st to end	Night	27% 22% 32% 16% 3	924

Page generated at 2026-03-15 02:23:57. Version ac07

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