Carolina Beach State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Carolina Beach State Park clear sky chart from 2005-11-06 to 2024-11-10.

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 6% 4 4 4 4 6% 8% 43%	100689
	Night	12% 6% 2 6% 4 4 5% 4 6% 8% 42%	98397
Transparency	Day	38% 6% 15% 21% 15% 5%	104333
	Night	38% 6% 13% 20% 17% 6%	102892
Seeing	Day	13% 4 15% 28% 28% 11%	15666
	Night	14% 5% 18% 30% 26% 7%	25933

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	13% 6% 1 4 4 3 4 3 6% 8% 48%	2836
	11th to 20th	Day	10% 6% 2 6% 5% 4 4 3 5% 7% 48%	2840
	21st to end	Day	13% 8% 3 8% 5% 4 3 3 4 5% 44%	3124
February	1st to 10th	Day	15% 6% 2 7% 5% 5% 4 3 5% 7% 42%	1710
	11th to 20th	Day	17% 7% 2 7% 4 3 3 3 3 5% 45%	1775
	21st to end	Day	13% 8% 2 6% 3 4 4 4 6% 7% 42%	1672
March	1st to 10th	Day	21% 9% 3 6% 4 3 4 3 4 6% 37%	3435
	11th to 20th	Day	9% 4 1 5% 3 3 4 4 5% 7% 54%	3480
	21st to end	Day	15% 6% 2 6% 4 4 4 4 5% 5% 46%	3815
April	1st to 10th	Day	10% 5% 2 3 4 3 4 3 6% 8% 53%	2247
	11th to 20th	Day	9% 4 2 5% 4 3 4 4 6% 7% 53%	2254
	21st to end	Day	8% 3 2 3 4 3 4 3 6% 8% 56%	2280
May	1st to 10th	Day	6% 5% 2 6% 5% 5% 5% 4 7% 10% 45%	3765
	11th to 20th	Day	14% 6% 2 7% 5% 4 4 4 6% 7% 40%	4074
	21st to end	Day	6% 3 2 5% 3 5% 5% 5% 8% 11% 48%	4476
June	1st to 10th	Day	10% 7% 2 6% 5% 5% 5% 5% 8% 10% 37%	2470
	11th to 20th	Day	8% 4 2 4 4 4 5% 5% 7% 12% 43%	2470
	21st to end	Day	8% 4 2 6% 5% 5% 7% 5% 9% 12% 37%	2470
July	1st to 10th	Day	11% 5% 2 7% 4 5% 5% 5% 8% 14% 35%	4120
	11th to 20th	Day	8% 6% 3 8% 6% 5% 6% 5% 8% 10% 35%	4120
	21st to end	Day	8% 6% 3 8% 6% 6% 6% 5% 9% 12% 32%	4466
August	1st to 10th	Day	19% 11% 3 9% 4 4 6% 4 7% 9% 25%	4104
	11th to 20th	Day	7% 5% 2 6% 5% 6% 5% 5% 8% 11% 40%	3735
	21st to end	Day	8% 7% 3 6% 4 4 5% 4 6% 10% 44%	4180
September	1st to 10th	Day	10% 5% 2 7% 5% 5% 5% 4 7% 9% 42%	2280
	11th to 20th	Day	16% 8% 2 7% 4 5% 4 4 5% 7% 38%	2237
	21st to end	Day	17% 6% 3 7% 5% 4 4 4 5% 6% 39%	2001
October	1st to 10th	Day	15% 7% 2 7% 4 4 4 3 5% 5% 44%	1900
	11th to 20th	Day	9% 4 2 5% 4 4 3 4 4 5% 58%	1900
	21st to end	Day	9% 5% 1 6% 4 3 2 3 4 6% 56%	2090
November	1st to 10th	Day	13% 5% 2 4 3 3 3 3 5% 7% 52%	1947
	11th to 20th	Day	13% 6% 2 5% 4 4 3 3 4 6% 51%	1900
	21st to end	Day	10% 5% 2 5% 4 4 4 3 5% 8% 49%	1772
December	1st to 10th	Day	13% 8% 2 7% 5% 4 4 5% 7% 8% 38%	1520
	11th to 20th	Day	15% 5% 2 4 4 3 3 3 4 5% 54%	2100
	21st to end	Day	14% 9% 3 6% 3 4 4 3 6% 7% 41%	3124
January	1st to 10th	Night	13% 8% 3 6% 4 3 4 3 5% 7% 45%	4109
	11th to 20th	Night	11% 8% 2 7% 4 4 4 5% 6% 8% 40%	4120
	21st to end	Night	12% 8% 3 8% 4 4 4 3 5% 5% 45%	4532
February	1st to 10th	Night	17% 6% 2 6% 4 4 4 3 4 6% 44%	2470
	11th to 20th	Night	17% 8% 3 6% 4 3 4 3 4 8% 41%	2288
	21st to end	Night	16% 6% 3 7% 4 4 4 4 4 6% 43%	1779
March	1st to 10th	Night	22% 11% 4 7% 4 3 4 3 4 6% 32%	3418
	11th to 20th	Night	11% 5% 2 6% 4 4 4 4 6% 8% 46%	3480
	21st to end	Night	15% 5% 2 5% 3 3 4 3 5% 7% 49%	3817
April	1st to 10th	Night	9% 6% 2 4 4 4 4 5% 6% 7% 49%	1933
	11th to 20th	Night	9% 6% 2 5% 4 5% 5% 3 5% 5% 50%	1875
	21st to end	Night	7% 5% 2 4 3 4 4 3 6% 6% 56%	1900
May	1st to 10th	Night	6% 5% 2 6% 6% 5% 5% 5% 6% 10% 44%	3130
	11th to 20th	Night	11% 8% 3 8% 4 5% 4 5% 5% 8% 39%	2846
	21st to end	Night	8% 4 2 5% 4 4 4 4 8% 11% 46%	3079
June	1st to 10th	Night	9% 7% 3 7% 5% 5% 5% 5% 8% 10% 36%	1710
	11th to 20th	Night	10% 4 1 5% 5% 4 4 6% 8% 11% 42%	1710
	21st to end	Night	8% 5% 2 7% 6% 5% 7% 6% 9% 12% 34%	1710
July	1st to 10th	Night	8% 4 2 6% 5% 6% 7% 6% 8% 13% 34%	2840
	11th to 20th	Night	7% 5% 2 8% 6% 6% 7% 6% 9% 12% 33%	2840
	21st to end	Night	7% 6% 2 6% 6% 6% 6% 7% 11% 14% 30%	3087
August	1st to 10th	Night	18% 9% 4 7% 4 4 5% 5% 7% 10% 27%	2825
	11th to 20th	Night	7% 5% 2 6% 5% 5% 6% 5% 9% 13% 38%	3060
	21st to end	Night	6% 6% 2 6% 5% 5% 5% 5% 7% 9% 45%	3476
September	1st to 10th	Night	11% 5% 2 7% 4 5% 6% 5% 7% 9% 39%	1900
	11th to 20th	Night	13% 8% 2 7% 5% 4 6% 5% 7% 9% 33%	1938
	21st to end	Night	17% 7% 3 7% 5% 4 4 3 5% 8% 37%	2176
October	1st to 10th	Night	13% 8% 3 6% 4 4 4 3 5% 6% 45%	2280
	11th to 20th	Night	9% 5% 2 5% 3 4 4 3 5% 7% 53%	2280
	21st to end	Night	9% 5% 2 4 4 3 3 3 4 6% 55%	2508
November	1st to 10th	Night	11% 5% 2 5% 4 4 4 3 5% 5% 52%	2336
	11th to 20th	Night	13% 6% 2 5% 5% 4 4 4 5% 6% 46%	2280
	21st to end	Night	11% 6% 2 5% 4 4 4 3 6% 8% 48%	2393
December	1st to 10th	Night	14% 8% 2 6% 4 4 4 4 6% 7% 40%	2660
	11th to 20th	Night	14% 7% 2 5% 4 3 4 3 4 5% 49%	3080
	21st to end	Night	14% 7% 2 6% 4 3 4 3 5% 6% 45%	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	35% 3 9% 22% 25% 6%	2837
	11th to 20th	Day	36% 4 6% 22% 23% 9%	2840
	21st to end	Day	44% 3 7% 20% 18% 7%	3124
February	1st to 10th	Day	43% 3 9% 22% 18% 4	1710
	11th to 20th	Day	43% 3 8% 17% 22% 8%	1784
	21st to end	Day	41% 4 12% 18% 16% 9%	1672
March	1st to 10th	Day	50% 3 10% 15% 14% 7%	3435
	11th to 20th	Day	29% 4 10% 19% 25% 13%	3480
	21st to end	Day	41% 3 9% 24% 17% 6%	3815
April	1st to 10th	Day	29% 4 14% 23% 23% 6%	2247
	11th to 20th	Day	30% 4 14% 25% 19% 9%	2254
	21st to end	Day	26% 5% 15% 27% 24% 3	2280
May	1st to 10th	Day	34% 6% 25% 24% 11% 2	3800
	11th to 20th	Day	43% 4 15% 25% 13%	4078
	21st to end	Day	29% 6% 21% 29% 14% 1	4489
June	1st to 10th	Day	40% 8% 18% 23% 11%	2470
	11th to 20th	Day	31% 9% 22% 25% 11% 1	2470
	21st to end	Day	36% 10% 22% 23% 8% 1	2470
July	1st to 10th	Day	37% 11% 26% 22% 4 1	4055
	11th to 20th	Day	41% 13% 29% 12% 4	4051
	21st to end	Day	41% 11% 26% 15% 7%	4324
August	1st to 10th	Day	55% 8% 23% 12% 2	4091
	11th to 20th	Day	35% 11% 22% 23% 9%	3771
	21st to end	Day	35% 6% 21% 32% 5% 1	4180
September	1st to 10th	Day	38% 9% 20% 18% 13% 3	2280
	11th to 20th	Day	45% 6% 15% 17% 14% 3	2237
	21st to end	Day	45% 7% 11% 19% 15% 3	2001
October	1st to 10th	Day	41% 4 7% 22% 22% 4	3160
	11th to 20th	Day	21% 3 6% 17% 28% 24%	3140
	21st to end	Day	30% 3 6% 26% 26% 9%	3428
November	1st to 10th	Day	32% 4 8% 22% 25% 9%	1947
	11th to 20th	Day	37% 3 8% 20% 24% 8%	1900
	21st to end	Day	34% 4 10% 22% 23% 6%	1772
December	1st to 10th	Day	43% 5% 14% 19% 13% 6%	1520
	11th to 20th	Day	35% 3 7% 22% 24% 9%	2097
	21st to end	Day	42% 3 11% 22% 19% 3	3124
January	1st to 10th	Night	40% 3 8% 21% 22% 6%	4109
	11th to 20th	Night	41% 4 8% 18% 24% 5%	4120
	21st to end	Night	42% 2 8% 15% 26% 6%	4532
February	1st to 10th	Night	43% 3 9% 19% 20% 6%	2470
	11th to 20th	Night	44% 4 8% 16% 20% 8%	2290
	21st to end	Night	43% 3 10% 18% 16% 9%	1779
March	1st to 10th	Night	55% 3 10% 14% 12% 5%	3418
	11th to 20th	Night	36% 5% 10% 13% 22% 14%	3480
	21st to end	Night	37% 3 12% 27% 17% 5%	3817
April	1st to 10th	Night	34% 4 14% 18% 22% 8%	1933
	11th to 20th	Night	36% 4 12% 21% 18% 9%	1875
	21st to end	Night	28% 5% 15% 28% 20% 4	1900
May	1st to 10th	Night	35% 5% 21% 24% 13% 2	3160
	11th to 20th	Night	43% 6% 13% 23% 14%	2847
	21st to end	Night	32% 6% 19% 27% 15%	3087
June	1st to 10th	Night	42% 6% 21% 22% 9%	1710
	11th to 20th	Night	33% 8% 22% 26% 9%	1710
	21st to end	Night	37% 13% 20% 23% 7%	1710
July	1st to 10th	Night	38% 11% 23% 22% 5%	2795
	11th to 20th	Night	40% 13% 32% 12% 3	2786
	21st to end	Night	41% 15% 20% 19% 5%	2988
August	1st to 10th	Night	51% 8% 25% 13% 2	2814
	11th to 20th	Night	35% 11% 24% 23% 7%	3090
	21st to end	Night	35% 7% 18% 34% 6% 1	3476
September	1st to 10th	Night	39% 10% 20% 17% 11% 3	1900
	11th to 20th	Night	45% 7% 14% 19% 13% 2	1938
	21st to end	Night	47% 5% 12% 21% 13% 2	2176
October	1st to 10th	Night	39% 5% 8% 18% 23% 6%	3800
	11th to 20th	Night	20% 4 5% 17% 23% 32%	3779
	21st to end	Night	25% 3 6% 27% 28% 11%	4120
November	1st to 10th	Night	34% 5% 9% 18% 24% 9%	2336
	11th to 20th	Night	40% 4 9% 16% 23% 9%	2280
	21st to end	Night	35% 3 10% 23% 23% 6%	2393
December	1st to 10th	Night	43% 5% 13% 17% 17% 5%	2660
	11th to 20th	Night	39% 3 7% 20% 25% 6%	3082
	21st to end	Night	41% 3 9% 22% 22% 3	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	15% 7% 35% 33% 10% 1	270
	11th to 20th	Day	10% 6% 27% 41% 16% 1	270
	21st to end	Day	18% 5% 31% 35% 10% 1	297
February	1st to 10th	Day	16% 5% 25% 40% 13%	270
	11th to 20th	Day	23% 5% 29% 31% 11% 1	383
	21st to end	Day	16% 6% 29% 36% 11% 2	382
March	1st to 10th	Day	14% 5% 29% 32% 19% 2	460
	11th to 20th	Day	15% 8% 28% 35% 13% 2	460
	21st to end	Day	14% 6% 27% 37% 15% 2	506
April	1st to 10th	Day	12% 8% 24% 33% 21% 3	460
	11th to 20th	Day	11% 3 23% 29% 26% 8%	452
	21st to end	Day	10% 3 17% 35% 25% 10%	460
May	1st to 10th	Day	5% 3 20% 40% 22% 10%	463
	11th to 20th	Day	14% 5% 10% 26% 34% 11%	487
	21st to end	Day	11% 2 7% 23% 36% 20%	529
June	1st to 10th	Day	14% 2 4 28% 37% 14%	490
	11th to 20th	Day	10% 2 8% 22% 36% 21%	490
	21st to end	Day	8% 2 6% 23% 43% 17%	490
July	1st to 10th	Day	11% 2 3 15% 47% 22%	485
	11th to 20th	Day	10% 2 3 14% 50% 22%	484
	21st to end	Day	8% 3 4 18% 48% 19%	532
August	1st to 10th	Day	17% 2 5% 20% 35% 22%	486
	11th to 20th	Day	11% 2 4 18% 39% 27%	479
	21st to end	Day	12% 4 4 15% 42% 24%	539
September	1st to 10th	Day	10% 2 6% 21% 36% 25%	490
	11th to 20th	Day	21% 4 6% 22% 35% 13%	490
	21st to end	Day	19% 3 9% 23% 29% 17%	490
October	1st to 10th	Day	17% 4 11% 24% 30% 13%	490
	11th to 20th	Day	10% 2 15% 32% 32% 9%	490
	21st to end	Day	9% 3 18% 32% 29% 9%	539
November	1st to 10th	Day	16% 4 16% 32% 24% 8%	491
	11th to 20th	Day	15% 6% 24% 35% 18% 2	460
	21st to end	Day	11% 6% 25% 34% 21% 3	380
December	1st to 10th	Day	20% 3 22% 34% 20% 1	180
	11th to 20th	Day	18% 5% 27% 29% 16% 4	245
	21st to end	Day	19% 6% 25% 30% 17% 4	297
January	1st to 10th	Night	15% 13% 29% 32% 11%	760
	11th to 20th	Night	14% 9% 26% 37% 13% 1	760
	21st to end	Night	16% 9% 32% 36% 7%	836
February	1st to 10th	Night	20% 5% 28% 36% 10%	760
	11th to 20th	Night	19% 10% 31% 34% 6%	743
	21st to end	Night	20% 6% 26% 35% 11% 1	628
March	1st to 10th	Night	14% 7% 28% 36% 14% 1	760
	11th to 20th	Night	14% 6% 27% 36% 14% 3	760
	21st to end	Night	15% 4 28% 33% 17% 2	836
April	1st to 10th	Night	12% 6% 26% 34% 19% 2	760
	11th to 20th	Night	13% 4 20% 32% 24% 6%	751
	21st to end	Night	8% 5% 20% 37% 26% 4	760
May	1st to 10th	Night	8% 6% 17% 40% 25% 6%	760
	11th to 20th	Night	16% 3 16% 31% 27% 7%	582
	21st to end	Night	11% 2 6% 23% 39% 19%	617
June	1st to 10th	Night	11% 3 7% 32% 37% 10%	570
	11th to 20th	Night	11% 3 4 27% 40% 15%	570
	21st to end	Night	9% 3 5% 25% 45% 12%	570
July	1st to 10th	Night	8% 2 4 21% 49% 17%	555
	11th to 20th	Night	9% 2 3 18% 52% 17%	552
	21st to end	Night	7% 2 4 23% 51% 13%	624
August	1st to 10th	Night	12% 3 3 24% 42% 16%	567
	11th to 20th	Night	10% 4 3 20% 45% 18%	725
	21st to end	Night	12% 3 5% 19% 43% 19%	836
September	1st to 10th	Night	12% 3 5% 21% 43% 16%	760
	11th to 20th	Night	16% 2 7% 24% 39% 11%	760
	21st to end	Night	21% 2 9% 25% 32% 11%	760
October	1st to 10th	Night	16% 4 11% 28% 31% 10%	760
	11th to 20th	Night	11% 3 20% 33% 26% 7%	760
	21st to end	Night	12% 6% 16% 30% 28% 8%	836
November	1st to 10th	Night	13% 4 20% 34% 24% 5%	779
	11th to 20th	Night	16% 6% 25% 29% 21% 3	760
	21st to end	Night	11% 9% 24% 31% 21% 4	760
December	1st to 10th	Night	18% 8% 25% 33% 14% 2	760
	11th to 20th	Night	15% 8% 26% 32% 16% 2	760
	21st to end	Night	18% 7% 27% 32% 16% 1	836

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