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 2024-12-06.

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% 8% 3 6% 5% 4 4 4 5% 7% 37%	101663
	Night	17% 7% 2 6% 4 4 4 4 5% 7% 40%	98060
Transparency	Day	44% 7% 12% 21% 13% 2	105195
	Night	42% 7% 13% 22% 14% 2	102617
Seeing	Day	24% 17% 29% 18% 9% 3	14985
	Night	22% 17% 30% 23% 8% 1	24205

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	13% 10% 3 7% 4 5% 4 3 4 6% 40%	2517
	11th to 20th	Day	14% 12% 5% 11% 6% 5% 4 4 4 5% 31%	2520
	21st to end	Day	20% 12% 4 7% 4 4 4 4 5% 5% 30%	3068
February	1st to 10th	Day	16% 9% 2 8% 6% 5% 6% 5% 5% 6% 34%	1710
	11th to 20th	Day	13% 10% 3 7% 5% 6% 4 3 5% 6% 38%	1798
	21st to end	Day	19% 10% 3 7% 6% 4 4 3 5% 5% 34%	1570
March	1st to 10th	Day	24% 10% 3 7% 5% 3 3 3 4 5% 34%	3116
	11th to 20th	Day	9% 8% 3 8% 5% 4 5% 4 6% 8% 39%	3433
	21st to end	Day	20% 10% 3 5% 4 3 3 3 4 6% 41%	4070
April	1st to 10th	Day	16% 11% 3 6% 5% 4 5% 4 4 6% 36%	2280
	11th to 20th	Day	17% 8% 2 6% 4 4 4 4 4 7% 39%	2254
	21st to end	Day	18% 6% 2 6% 5% 5% 4 4 6% 6% 38%	2280
May	1st to 10th	Day	27% 7% 3 6% 4 4 4 3 5% 6% 31%	4202
	11th to 20th	Day	23% 9% 3 8% 5% 5% 5% 4 5% 6% 28%	4398
	21st to end	Day	14% 5% 2 5% 4 4 5% 4 7% 10% 42%	4837
June	1st to 10th	Day	15% 5% 3 7% 5% 6% 5% 4 6% 9% 35%	2660
	11th to 20th	Day	16% 7% 2 6% 6% 4 5% 4 7% 8% 34%	2660
	21st to end	Day	14% 6% 2 7% 5% 5% 5% 4 6% 9% 38%	2660
July	1st to 10th	Day	10% 5% 2 7% 6% 6% 6% 5% 7% 10% 37%	4440
	11th to 20th	Day	11% 6% 2 6% 5% 5% 5% 5% 7% 10% 39%	4440
	21st to end	Day	15% 8% 3 8% 5% 5% 5% 4 6% 7% 34%	4814
August	1st to 10th	Day	22% 5% 2 7% 5% 5% 5% 4 6% 8% 31%	4171
	11th to 20th	Day	14% 5% 3 6% 4 4 5% 5% 7% 9% 38%	3743
	21st to end	Day	16% 5% 2 5% 3 3 4 4 6% 8% 45%	4180
September	1st to 10th	Day	17% 6% 2 6% 4 4 4 4 5% 8% 41%	2280
	11th to 20th	Day	14% 5% 2 5% 4 3 3 4 4 7% 50%	2235
	21st to end	Day	19% 6% 2 7% 4 4 4 3 6% 6% 39%	2090
October	1st to 10th	Day	20% 7% 2 6% 4 4 4 3 5% 7% 39%	1922
	11th to 20th	Day	15% 6% 2 6% 4 4 5% 4 5% 7% 43%	1900
	21st to end	Day	22% 6% 2 5% 5% 4 4 4 5% 6% 38%	1976
November	1st to 10th	Day	14% 7% 2 5% 3 3 3 2 4 5% 51%	1761
	11th to 20th	Day	17% 8% 2 5% 3 3 4 3 5% 8% 42%	1800
	21st to end	Day	17% 8% 2 6% 5% 5% 6% 3 5% 7% 37%	1640
December	1st to 10th	Day	17% 10% 4 8% 5% 4 5% 3 6% 6% 33%	1560
	11th to 20th	Day	20% 9% 3 6% 4 4 4 3 6% 6% 35%	1906
	21st to end	Day	19% 12% 5% 10% 5% 5% 5% 4 5% 6% 24%	2772
January	1st to 10th	Night	15% 7% 2 6% 5% 4 4 4 5% 7% 40%	4429
	11th to 20th	Night	14% 10% 4 11% 5% 5% 4 3 5% 5% 35%	4440
	21st to end	Night	22% 12% 3 6% 5% 3 4 3 5% 5% 32%	4587
February	1st to 10th	Night	15% 9% 3 6% 5% 4 4 3 5% 7% 39%	2470
	11th to 20th	Night	14% 7% 2 7% 5% 4 5% 4 6% 7% 38%	2267
	21st to end	Night	18% 9% 2 7% 4 4 4 4 5% 5% 39%	1884
March	1st to 10th	Night	23% 10% 3 7% 4 4 3 3 5% 5% 35%	3724
	11th to 20th	Night	11% 8% 3 6% 4 4 4 3 6% 8% 43%	3524
	21st to end	Night	15% 10% 3 7% 3 4 3 3 4 5% 42%	3548
April	1st to 10th	Night	16% 8% 3 8% 6% 5% 5% 4 5% 7% 34%	1900
	11th to 20th	Night	19% 7% 2 5% 4 4 5% 4 5% 6% 39%	1875
	21st to end	Night	19% 7% 3 4 3 4 4 4 5% 7% 40%	1900
May	1st to 10th	Night	28% 8% 3 6% 3 3 4 3 5% 6% 31%	2766
	11th to 20th	Night	25% 9% 3 7% 4 3 3 3 4 6% 32%	2495
	21st to end	Night	14% 5% 2 6% 5% 4 5% 5% 6% 9% 40%	2738
June	1st to 10th	Night	17% 5% 2 5% 4 3 4 3 4 8% 43%	1520
	11th to 20th	Night	14% 6% 2 4 4 4 5% 5% 5% 9% 42%	1520
	21st to end	Night	12% 4 1 5% 3 4 4 4 7% 9% 46%	1520
July	1st to 10th	Night	10% 5% 2 7% 5% 5% 5% 5% 7% 8% 41%	2520
	11th to 20th	Night	12% 5% 3 5% 4 4 5% 5% 6% 10% 41%	2520
	21st to end	Night	17% 7% 2 5% 4 4 4 4 5% 8% 41%	2739
August	1st to 10th	Night	22% 5% 2 6% 3 4 4 4 6% 8% 35%	2754
	11th to 20th	Night	15% 7% 2 6% 4 4 4 3 5% 6% 43%	3053
	21st to end	Night	14% 4 1 4 3 3 3 3 5% 8% 51%	3476
September	1st to 10th	Night	15% 6% 2 5% 3 4 4 3 5% 7% 47%	1900
	11th to 20th	Night	13% 6% 2 4 3 3 3 2 4 6% 53%	1943
	21st to end	Night	18% 6% 2 6% 4 3 3 4 5% 6% 43%	2090
October	1st to 10th	Night	22% 6% 2 5% 3 3 4 3 4 5% 44%	2255
	11th to 20th	Night	18% 6% 1 5% 3 3 3 3 4 5% 48%	2280
	21st to end	Night	21% 7% 2 4 3 3 3 3 6% 7% 42%	2622
November	1st to 10th	Night	13% 6% 2 5% 4 4 4 3 5% 6% 50%	2537
	11th to 20th	Night	19% 7% 3 5% 3 4 3 3 5% 5% 44%	2600
	21st to end	Night	14% 7% 2 5% 4 4 4 4 5% 7% 42%	2755
December	1st to 10th	Night	18% 7% 3 6% 5% 4 5% 4 6% 7% 35%	2737
	11th to 20th	Night	18% 9% 2 5% 5% 4 4 4 5% 6% 36%	3288
	21st to end	Night	21% 10% 4 8% 4 4 4 3 5% 6% 31%	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	45% 6% 14% 26% 7% 2	2518
	11th to 20th	Day	55% 7% 10% 18% 8% 2	2520
	21st to end	Day	54% 7% 11% 18% 8% 1	3068
February	1st to 10th	Day	51% 7% 13% 18% 11% 1	1710
	11th to 20th	Day	46% 6% 10% 22% 14% 2	1807
	21st to end	Day	50% 6% 10% 22% 10% 2	1570
March	1st to 10th	Day	54% 5% 11% 20% 9% 2	3119
	11th to 20th	Day	39% 9% 15% 25% 10% 1	3433
	21st to end	Day	46% 5% 8% 14% 22% 4	4070
April	1st to 10th	Day	47% 7% 10% 20% 13% 4	2280
	11th to 20th	Day	45% 6% 11% 22% 14% 2	2254
	21st to end	Day	45% 7% 10% 20% 14% 4	2280
May	1st to 10th	Day	53% 6% 12% 17% 10% 2	4216
	11th to 20th	Day	54% 9% 11% 18% 8% 1	4402
	21st to end	Day	35% 9% 14% 25% 15% 2	4837
June	1st to 10th	Day	45% 9% 12% 19% 14% 1	2660
	11th to 20th	Day	45% 8% 13% 21% 10% 2	2660
	21st to end	Day	41% 9% 13% 24% 12%	2660
July	1st to 10th	Day	41% 10% 13% 22% 13% 1	4370
	11th to 20th	Day	38% 9% 17% 22% 13%	4365
	21st to end	Day	48% 7% 11% 18% 15% 1	4661
August	1st to 10th	Day	51% 8% 14% 19% 9%	4157
	11th to 20th	Day	40% 8% 15% 27% 10%	3779
	21st to end	Day	36% 6% 13% 31% 12% 1	4180
September	1st to 10th	Day	42% 7% 12% 21% 17% 1	2280
	11th to 20th	Day	34% 7% 10% 23% 24% 2	2235
	21st to end	Day	46% 6% 10% 19% 18% 2	2090
October	1st to 10th	Day	42% 5% 10% 18% 21% 3	3195
	11th to 20th	Day	33% 5% 9% 27% 21% 5%	3140
	21st to end	Day	30% 5% 16% 26% 19% 3	3240
November	1st to 10th	Day	36% 5% 13% 24% 18% 3	1761
	11th to 20th	Day	41% 6% 11% 23% 16% 3	1800
	21st to end	Day	46% 7% 14% 23% 8% 1	1640
December	1st to 10th	Day	51% 7% 15% 15% 11% 1	1560
	11th to 20th	Day	49% 7% 16% 20% 7% 1	1906
	21st to end	Day	59% 9% 10% 15% 7%	2772
January	1st to 10th	Night	42% 8% 13% 26% 9% 2	4429
	11th to 20th	Night	50% 7% 13% 21% 9% 1	4440
	21st to end	Night	53% 8% 11% 18% 9% 1	4587
February	1st to 10th	Night	45% 7% 14% 21% 11% 1	2470
	11th to 20th	Night	44% 7% 13% 19% 14% 2	2269
	21st to end	Night	46% 5% 11% 21% 14% 3	1884
March	1st to 10th	Night	50% 7% 12% 19% 11% 2	3734
	11th to 20th	Night	36% 9% 17% 25% 12% 1	3525
	21st to end	Night	43% 6% 8% 18% 20% 4	3548
April	1st to 10th	Night	49% 7% 12% 18% 13% 2	1900
	11th to 20th	Night	44% 8% 9% 22% 16% 1	1875
	21st to end	Night	43% 7% 11% 20% 16% 3	1900
May	1st to 10th	Night	53% 7% 10% 20% 8% 2	2772
	11th to 20th	Night	51% 9% 14% 16% 10% 1	2496
	21st to end	Night	37% 11% 15% 23% 13% 2	2739
June	1st to 10th	Night	40% 7% 11% 24% 17% 1	1520
	11th to 20th	Night	38% 9% 16% 26% 11% 1	1520
	21st to end	Night	32% 9% 17% 28% 13%	1520
July	1st to 10th	Night	38% 9% 18% 18% 16% 1	2480
	11th to 20th	Night	37% 9% 16% 25% 12% 1	2472
	21st to end	Night	42% 7% 14% 18% 18% 1	2651
August	1st to 10th	Night	45% 10% 17% 20% 8% 1	2744
	11th to 20th	Night	41% 7% 15% 27% 10%	3083
	21st to end	Night	32% 6% 12% 32% 17% 1	3476
September	1st to 10th	Night	38% 7% 12% 25% 18% 1	1900
	11th to 20th	Night	33% 6% 11% 24% 24% 2	1943
	21st to end	Night	41% 6% 10% 22% 20% 1	2090
October	1st to 10th	Night	41% 5% 12% 23% 18% 1	3762
	11th to 20th	Night	30% 4 10% 27% 24% 4	3779
	21st to end	Night	31% 6% 15% 28% 18% 2	4308
November	1st to 10th	Night	35% 6% 14% 22% 20% 3	2537
	11th to 20th	Night	42% 5% 12% 21% 18% 3	2600
	21st to end	Night	39% 8% 16% 26% 10% 1	2755
December	1st to 10th	Night	47% 8% 13% 22% 10% 1	2737
	11th to 20th	Night	47% 7% 15% 17% 12% 1	3288
	21st to end	Night	53% 8% 13% 19% 7%	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% 26% 26% 6% 2	180
	21st to end	Day	26% 32% 30% 8% 2 1	283
February	1st to 10th	Day	33% 30% 28% 7% 1	270
	11th to 20th	Day	34% 28% 31% 5% 1	406
	21st to end	Day	37% 24% 28% 10% 2	382
March	1st to 10th	Day	31% 23% 31% 12% 2	460
	11th to 20th	Day	29% 26% 30% 11% 2 1	460
	21st to end	Day	33% 25% 28% 9% 4 1	506
April	1st to 10th	Day	32% 25% 26% 12% 4	460
	11th to 20th	Day	28% 25% 27% 13% 6% 1	452
	21st to end	Day	29% 20% 32% 12% 4 2	460
May	1st to 10th	Day	32% 22% 26% 12% 6% 2	463
	11th to 20th	Day	22% 18% 32% 18% 7% 2	487
	21st to end	Day	18% 12% 30% 25% 13% 2	529
June	1st to 10th	Day	20% 14% 31% 22% 11% 2	490
	11th to 20th	Day	19% 17% 23% 27% 13% 1	490
	21st to end	Day	17% 14% 32% 25% 10% 2	490
July	1st to 10th	Day	15% 9% 30% 24% 16% 5%	485
	11th to 20th	Day	12% 7% 29% 31% 19% 3	484
	21st to end	Day	15% 8% 34% 28% 11% 3	532
August	1st to 10th	Day	13% 7% 29% 27% 17% 6%	486
	11th to 20th	Day	14% 7% 25% 31% 18% 4	479
	21st to end	Day	16% 10% 29% 24% 14% 7%	539
September	1st to 10th	Day	21% 10% 26% 21% 15% 7%	490
	11th to 20th	Day	14% 9% 28% 22% 16% 10%	490
	21st to end	Day	26% 11% 29% 20% 10% 4	490
October	1st to 10th	Day	28% 10% 23% 21% 12% 5%	490
	11th to 20th	Day	20% 20% 29% 22% 7% 2	490
	21st to end	Day	28% 16% 31% 18% 6% 1	479
November	1st to 10th	Day	22% 19% 28% 21% 9% 2	395
	11th to 20th	Day	27% 23% 30% 16% 4 1	400
	21st to end	Day	30% 25% 30% 13% 2 1	240
December	1st to 10th	Day	30% 29% 27% 9% 4 1	190
	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% 22% 33% 17% 2	760
	21st to end	Night	20% 28% 35% 15% 2	836
February	1st to 10th	Night	26% 22% 35% 16% 1	760
	11th to 20th	Night	25% 30% 35% 9% 1	743
	21st to end	Night	32% 24% 28% 13% 2	628
March	1st to 10th	Night	27% 23% 33% 14% 3	760
	11th to 20th	Night	26% 25% 29% 17% 3	760
	21st to end	Night	23% 26% 31% 15% 4 1	836
April	1st to 10th	Night	22% 24% 32% 20% 3	760
	11th to 20th	Night	24% 19% 32% 20% 5%	751
	21st to end	Night	25% 18% 31% 21% 5%	760
May	1st to 10th	Night	28% 14% 29% 22% 6%	541
	11th to 20th	Night	22% 10% 36% 25% 6% 1	374
	21st to end	Night	16% 7% 27% 36% 12%	411
June	1st to 10th	Night	18% 8% 26% 35% 14%	380
	11th to 20th	Night	14% 8% 32% 34% 11%	380
	21st to end	Night	13% 5% 30% 42% 10% 1	380
July	1st to 10th	Night	13% 4 25% 40% 16% 2	370
	11th to 20th	Night	11% 4 26% 43% 15% 1	368
	21st to end	Night	14% 5% 23% 42% 15% 1	416
August	1st to 10th	Night	14% 3 23% 39% 19% 2	522
	11th to 20th	Night	15% 5% 20% 37% 21% 2	718
	21st to end	Night	16% 5% 22% 33% 22% 1	836
September	1st to 10th	Night	18% 6% 27% 29% 17% 2	760
	11th to 20th	Night	16% 6% 26% 28% 20% 4	760
	21st to end	Night	22% 8% 24% 29% 16% 2	760
October	1st to 10th	Night	25% 11% 23% 24% 15% 1	760
	11th to 20th	Night	21% 14% 30% 27% 8%	760
	21st to end	Night	28% 15% 30% 21% 6%	836
November	1st to 10th	Night	18% 21% 29% 23% 9% 1	780
	11th to 20th	Night	26% 20% 28% 20% 6% 1	800
	21st to end	Night	23% 22% 31% 19% 5% 1	800
December	1st to 10th	Night	25% 21% 34% 15% 4	783
	11th to 20th	Night	25% 22% 33% 18% 3	760
	21st to end	Night	26% 22% 33% 16% 3	836

Page generated at 2024-12-03 06:45:08. Version ac07

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