Ocracoke Campground
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Ocracoke Campground 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% 7% 2 6% 4 4 4 4 6% 8% 42%	100768
	Night	13% 7% 2 6% 5% 4 4 4 6% 8% 41%	98213
Transparency	Day	38% 8% 15% 22% 13% 3	104409
	Night	40% 7% 14% 21% 15% 4	102712
Seeing	Day	14% 5% 19% 27% 26% 10%	15544
	Night	16% 7% 20% 28% 23% 6%	25210

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	10% 8% 2 7% 4 3 4 3 4 7% 48%	2781
	11th to 20th	Day	10% 6% 3 6% 5% 4 5% 4 6% 6% 45%	2840
	21st to end	Day	12% 11% 3 8% 4 4 4 3 5% 7% 38%	3124
February	1st to 10th	Day	15% 8% 2 5% 4 4 5% 4 6% 7% 41%	1761
	11th to 20th	Day	18% 8% 2 7% 4 3 3 3 5% 5% 41%	1848
	21st to end	Day	14% 7% 3 5% 4 5% 4 4 6% 7% 42%	1570
March	1st to 10th	Day	22% 10% 3 6% 4 3 3 2 6% 6% 35%	3297
	11th to 20th	Day	10% 5% 2 5% 3 3 3 3 4 6% 55%	3480
	21st to end	Day	16% 7% 2 4 4 3 4 3 4 6% 47%	3962
April	1st to 10th	Day	12% 5% 2 5% 4 4 3 3 4 6% 52%	2280
	11th to 20th	Day	8% 5% 2 5% 4 4 4 5% 6% 8% 50%	2254
	21st to end	Day	8% 4 2 4 4 4 4 3 6% 7% 54%	2280
May	1st to 10th	Day	8% 6% 2 6% 5% 5% 5% 4 7% 9% 42%	3765
	11th to 20th	Day	17% 9% 3 8% 5% 5% 5% 4 6% 7% 32%	3895
	21st to end	Day	7% 5% 2 6% 4 4 5% 4 7% 10% 45%	4823
June	1st to 10th	Day	9% 6% 2 7% 5% 6% 5% 4 7% 10% 40%	2660
	11th to 20th	Day	8% 4 2 4 4 5% 4 4 8% 11% 45%	2660
	21st to end	Day	7% 4 2 6% 5% 5% 7% 6% 8% 11% 39%	2660
July	1st to 10th	Day	9% 6% 2 6% 4 4 5% 4 8% 12% 40%	4362
	11th to 20th	Day	7% 7% 3 8% 6% 6% 6% 5% 8% 12% 34%	4120
	21st to end	Day	8% 7% 3 7% 6% 6% 6% 5% 9% 11% 32%	4466
August	1st to 10th	Day	13% 12% 4 10% 5% 5% 4 4 7% 9% 27%	3918
	11th to 20th	Day	7% 5% 2 6% 5% 4 5% 4 7% 9% 45%	3730
	21st to end	Day	8% 6% 3 7% 4 5% 5% 4 8% 9% 42%	4180
September	1st to 10th	Day	12% 6% 3 7% 5% 4 4 4 6% 9% 39%	2280
	11th to 20th	Day	14% 7% 2 7% 5% 6% 5% 5% 6% 7% 36%	2275
	21st to end	Day	18% 8% 3 7% 5% 4 4 3 5% 6% 37%	2066
October	1st to 10th	Day	13% 6% 2 6% 4 4 4 3 5% 5% 48%	1900
	11th to 20th	Day	13% 5% 2 5% 4 4 4 2 5% 5% 51%	1900
	21st to end	Day	11% 5% 2 5% 4 3 4 3 5% 6% 52%	2090
November	1st to 10th	Day	15% 6% 2 5% 4 4 4 3 5% 6% 45%	1841
	11th to 20th	Day	15% 6% 2 5% 4 3 3 3 5% 7% 47%	1710
	21st to end	Day	13% 6% 2 6% 4 3 4 4 5% 7% 47%	1710
December	1st to 10th	Day	15% 7% 3 7% 5% 5% 5% 4 5% 7% 37%	1598
	11th to 20th	Day	16% 6% 2 5% 4 3 2 3 4 5% 51%	1910
	21st to end	Day	12% 6% 3 6% 4 4 4 3 5% 7% 46%	2772
January	1st to 10th	Night	13% 8% 2 6% 4 4 4 3 5% 7% 45%	4160
	11th to 20th	Night	14% 7% 2 6% 4 5% 5% 4 6% 7% 40%	4120
	21st to end	Night	13% 7% 2 7% 5% 5% 4 3 6% 6% 42%	4532
February	1st to 10th	Night	18% 7% 2 5% 4 4 4 4 5% 6% 40%	2418
	11th to 20th	Night	17% 10% 2 7% 4 3 4 4 6% 5% 38%	2218
	21st to end	Night	16% 7% 2 7% 5% 4 4 4 4 6% 41%	1884
March	1st to 10th	Night	20% 12% 4 8% 5% 4 4 3 4 5% 30%	3552
	11th to 20th	Night	11% 6% 2 6% 4 3 4 3 6% 6% 48%	3480
	21st to end	Night	15% 8% 3 5% 4 3 3 3 4 5% 48%	3668
April	1st to 10th	Night	12% 7% 2 6% 3 3 4 3 5% 6% 48%	1900
	11th to 20th	Night	9% 6% 2 6% 4 5% 5% 4 7% 6% 46%	1875
	21st to end	Night	10% 4 2 5% 4 4 4 4 5% 7% 51%	1900
May	1st to 10th	Night	8% 6% 3 6% 6% 6% 6% 5% 8% 10% 38%	3130
	11th to 20th	Night	18% 8% 3 6% 5% 4 4 4 6% 8% 35%	3022
	21st to end	Night	9% 7% 3 5% 4 4 5% 4 7% 10% 41%	2732
June	1st to 10th	Night	11% 5% 2 6% 4 5% 5% 4 7% 10% 39%	1520
	11th to 20th	Night	8% 5% 2 4 4 4 6% 5% 7% 12% 43%	1520
	21st to end	Night	8% 6% 2 5% 6% 6% 5% 5% 8% 11% 38%	1520
July	1st to 10th	Night	6% 6% 2 8% 5% 6% 5% 5% 8% 12% 36%	2578
	11th to 20th	Night	8% 6% 2 8% 6% 6% 7% 5% 9% 13% 31%	2840
	21st to end	Night	9% 6% 2 7% 5% 6% 6% 6% 10% 14% 30%	3087
August	1st to 10th	Night	11% 10% 4 10% 6% 5% 5% 5% 7% 11% 26%	2980
	11th to 20th	Night	6% 5% 2 7% 5% 6% 6% 4 8% 10% 39%	3097
	21st to end	Night	8% 5% 2 6% 5% 4 5% 5% 8% 10% 40%	3476
September	1st to 10th	Night	12% 6% 2 7% 6% 5% 6% 5% 8% 8% 34%	1900
	11th to 20th	Night	15% 8% 3 8% 5% 4 4 3 6% 8% 36%	1905
	21st to end	Night	18% 8% 2 7% 5% 5% 5% 4 5% 6% 34%	2109
October	1st to 10th	Night	12% 7% 3 7% 4 4 4 3 5% 7% 45%	2280
	11th to 20th	Night	15% 6% 2 4 3 4 4 3 5% 6% 48%	2280
	21st to end	Night	12% 4 2 5% 4 3 4 3 4 6% 52%	2508
November	1st to 10th	Night	14% 7% 2 6% 4 4 4 3 5% 6% 43%	2334
	11th to 20th	Night	17% 7% 2 6% 4 3 3 3 5% 6% 42%	2470
	21st to end	Night	13% 6% 2 6% 4 3 4 3 5% 7% 48%	2470
December	1st to 10th	Night	15% 9% 3 7% 4 5% 4 4 5% 7% 38%	2579
	11th to 20th	Night	14% 7% 3 6% 4 3 3 3 5% 6% 46%	3285
	21st to end	Night	12% 8% 3 6% 4 4 4 3 5% 7% 45%	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	37% 6% 9% 29% 17% 2	2782
	11th to 20th	Day	38% 6% 8% 24% 19% 5%	2840
	21st to end	Day	45% 7% 11% 18% 15% 5%	3124
February	1st to 10th	Day	42% 5% 14% 23% 14% 2	1761
	11th to 20th	Day	46% 4 10% 18% 18% 4	1857
	21st to end	Day	41% 6% 14% 20% 15% 5%	1570
March	1st to 10th	Day	51% 5% 12% 14% 12% 6%	3297
	11th to 20th	Day	30% 5% 11% 19% 22% 12%	3480
	21st to end	Day	38% 6% 11% 25% 16% 4	3962
April	1st to 10th	Day	34% 6% 14% 21% 21% 4	2280
	11th to 20th	Day	31% 6% 14% 27% 17% 5%	2254
	21st to end	Day	28% 6% 15% 30% 18% 3	2280
May	1st to 10th	Day	35% 10% 23% 22% 9% 1	3800
	11th to 20th	Day	48% 10% 13% 23% 6% 1	3899
	21st to end	Day	31% 10% 17% 32% 9%	4837
June	1st to 10th	Day	38% 9% 18% 23% 12%	2660
	11th to 20th	Day	31% 10% 20% 28% 10%	2660
	21st to end	Day	35% 12% 21% 24% 8%	2660
July	1st to 10th	Day	35% 8% 26% 24% 6%	4294
	11th to 20th	Day	41% 13% 30% 13% 4	4051
	21st to end	Day	43% 13% 19% 17% 8%	4324
August	1st to 10th	Day	53% 8% 25% 11% 3	3905
	11th to 20th	Day	34% 10% 18% 26% 11%	3766
	21st to end	Day	36% 8% 21% 26% 9% 1	4180
September	1st to 10th	Day	41% 11% 19% 17% 12% 2	2280
	11th to 20th	Day	45% 9% 13% 19% 13% 1	2275
	21st to end	Day	48% 6% 12% 17% 15% 1	2066
October	1st to 10th	Day	35% 4 8% 23% 23% 6%	3160
	11th to 20th	Day	29% 4 7% 19% 23% 17%	3140
	21st to end	Day	26% 5% 8% 34% 22% 5%	3428
November	1st to 10th	Day	40% 7% 9% 20% 21% 3	1841
	11th to 20th	Day	38% 4 11% 21% 21% 5%	1710
	21st to end	Day	37% 5% 13% 23% 20% 3	1710
December	1st to 10th	Day	46% 7% 14% 19% 11% 3	1598
	11th to 20th	Day	39% 4 9% 23% 20% 5%	1906
	21st to end	Day	38% 5% 14% 24% 17% 2	2772
January	1st to 10th	Night	38% 6% 9% 24% 19% 3	4160
	11th to 20th	Night	43% 5% 10% 21% 16% 5%	4120
	21st to end	Night	41% 7% 10% 19% 19% 4	4532
February	1st to 10th	Night	43% 5% 11% 22% 15% 4	2418
	11th to 20th	Night	47% 5% 10% 16% 17% 4	2220
	21st to end	Night	45% 5% 11% 18% 16% 5%	1884
March	1st to 10th	Night	57% 5% 9% 15% 12% 2	3552
	11th to 20th	Night	35% 7% 10% 14% 21% 12%	3480
	21st to end	Night	40% 5% 10% 25% 15% 5%	3668
April	1st to 10th	Night	37% 5% 14% 19% 21% 5%	1900
	11th to 20th	Night	37% 5% 14% 23% 16% 5%	1875
	21st to end	Night	32% 7% 12% 30% 15% 3	1900
May	1st to 10th	Night	37% 11% 21% 20% 9% 1	3160
	11th to 20th	Night	46% 8% 15% 19% 11% 1	3023
	21st to end	Night	34% 9% 22% 25% 9% 1	2739
June	1st to 10th	Night	38% 9% 19% 23% 11% 1	1520
	11th to 20th	Night	32% 9% 21% 26% 11% 1	1520
	21st to end	Night	37% 11% 21% 24% 8%	1520
July	1st to 10th	Night	37% 10% 26% 22% 5%	2537
	11th to 20th	Night	42% 13% 28% 14% 3	2786
	21st to end	Night	40% 16% 20% 14% 9%	2988
August	1st to 10th	Night	50% 8% 26% 14% 2	2969
	11th to 20th	Night	37% 11% 19% 24% 9%	3127
	21st to end	Night	35% 9% 19% 28% 9% 1	3476
September	1st to 10th	Night	44% 10% 16% 18% 11% 1	1900
	11th to 20th	Night	47% 8% 13% 18% 12% 2	1905
	21st to end	Night	50% 7% 11% 19% 12%	2109
October	1st to 10th	Night	39% 5% 8% 19% 24% 4	3800
	11th to 20th	Night	31% 3 6% 18% 20% 22%	3779
	21st to end	Night	25% 4 8% 34% 24% 6%	4120
November	1st to 10th	Night	41% 6% 10% 20% 19% 4	2334
	11th to 20th	Night	43% 5% 10% 17% 20% 5%	2470
	21st to end	Night	37% 4 11% 24% 20% 4	2470
December	1st to 10th	Night	46% 6% 13% 17% 14% 3	2579
	11th to 20th	Night	40% 5% 10% 20% 20% 5%	3288
	21st to end	Night	38% 5% 13% 24% 18% 2	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	16% 14% 38% 23% 9%	256
	11th to 20th	Day	16% 9% 33% 33% 10% 1	270
	21st to end	Day	16% 12% 34% 26% 11% 1	297
February	1st to 10th	Day	18% 8% 32% 30% 11% 1	321
	11th to 20th	Day	22% 12% 34% 27% 5%	456
	21st to end	Day	16% 9% 33% 30% 10% 2	382
March	1st to 10th	Day	16% 10% 35% 26% 13% 1	460
	11th to 20th	Day	17% 10% 33% 27% 12% 1	460
	21st to end	Day	16% 7% 34% 28% 12% 3	506
April	1st to 10th	Day	16% 9% 30% 29% 14% 2	460
	11th to 20th	Day	9% 7% 25% 29% 25% 4	452
	21st to end	Day	9% 4 25% 35% 23% 5%	460
May	1st to 10th	Day	11% 5% 22% 33% 22% 7%	463
	11th to 20th	Day	16% 3 13% 33% 25% 10%	487
	21st to end	Day	12% 3 9% 26% 31% 19%	529
June	1st to 10th	Day	11% 2 9% 33% 36% 9%	490
	11th to 20th	Day	10% 3 9% 25% 37% 17%	490
	21st to end	Day	8% 2 10% 23% 42% 16%	490
July	1st to 10th	Day	11% 4 5% 17% 43% 21%	485
	11th to 20th	Day	8% 2 5% 19% 46% 21%	484
	21st to end	Day	9% 3 5% 24% 46% 14%	532
August	1st to 10th	Day	13% 2 6% 24% 37% 17%	486
	11th to 20th	Day	10% 2 3 20% 40% 24%	479
	21st to end	Day	13% 3 5% 20% 41% 18%	539
September	1st to 10th	Day	13% 3 9% 21% 30% 23%	490
	11th to 20th	Day	15% 4 10% 25% 34% 12%	490
	21st to end	Day	22% 3 10% 26% 29% 12%	490
October	1st to 10th	Day	17% 4 12% 23% 31% 12%	490
	11th to 20th	Day	14% 5% 17% 32% 24% 8%	490
	21st to end	Day	11% 6% 19% 27% 27% 9%	539
November	1st to 10th	Day	17% 7% 19% 27% 24% 6%	445
	11th to 20th	Day	19% 5% 28% 32% 12% 3	370
	21st to end	Day	14% 9% 25% 31% 18% 3	370
December	1st to 10th	Day	17% 7% 38% 25% 11% 2	258
	11th to 20th	Day	18% 8% 33% 24% 16% 2	180
	21st to end	Day	17% 6% 30% 29% 15% 2	198
January	1st to 10th	Night	16% 16% 33% 25% 10% 1	760
	11th to 20th	Night	16% 13% 29% 29% 13% 1	760
	21st to end	Night	20% 13% 34% 27% 6%	836
February	1st to 10th	Night	21% 10% 31% 29% 8% 1	760
	11th to 20th	Night	22% 14% 32% 24% 7%	743
	21st to end	Night	19% 12% 30% 28% 9% 1	628
March	1st to 10th	Night	15% 11% 32% 29% 11% 1	760
	11th to 20th	Night	16% 10% 31% 30% 11% 3	760
	21st to end	Night	17% 11% 28% 29% 13% 2	836
April	1st to 10th	Night	14% 9% 32% 30% 14% 1	760
	11th to 20th	Night	11% 6% 26% 32% 21% 4	751
	21st to end	Night	12% 4 23% 37% 21% 2	760
May	1st to 10th	Night	15% 5% 20% 36% 19% 4	760
	11th to 20th	Night	16% 4 20% 32% 20% 7%	693
	21st to end	Night	12% 2 7% 30% 34% 14%	411
June	1st to 10th	Night	13% 2 11% 34% 33% 7%	380
	11th to 20th	Night	9% 2 8% 29% 43% 11%	380
	21st to end	Night	10% 2 7% 35% 37% 9%	380
July	1st to 10th	Night	7% 1 5% 29% 44% 13%	401
	11th to 20th	Night	11% 2 4 21% 47% 16%	552
	21st to end	Night	10% 3 5% 28% 47% 7%	624
August	1st to 10th	Night	12% 2 5% 27% 41% 12%	657
	11th to 20th	Night	11% 3 3 26% 38% 19%	750
	21st to end	Night	14% 2 4 22% 42% 16%	836
September	1st to 10th	Night	14% 2 7% 20% 38% 19%	760
	11th to 20th	Night	18% 3 8% 26% 35% 10%	760
	21st to end	Night	22% 4 8% 26% 33% 8%	760
October	1st to 10th	Night	15% 3 13% 26% 33% 10%	760
	11th to 20th	Night	18% 5% 20% 28% 23% 6%	760
	21st to end	Night	14% 7% 21% 27% 25% 6%	836
November	1st to 10th	Night	15% 6% 19% 33% 22% 5%	760
	11th to 20th	Night	20% 7% 21% 33% 17% 2	760
	21st to end	Night	15% 9% 26% 28% 19% 3	760
December	1st to 10th	Night	19% 11% 28% 26% 15% 1	760
	11th to 20th	Night	17% 10% 31% 30% 10% 3	760
	21st to end	Night	17% 11% 29% 31% 11% 1	836

Page generated at 2024-11-03 02:11:23. Version ac07

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