Sun City Carolina Lakes
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Sun City Carolina Lakes clear sky chart from 2005-11-06 to 2024-01-16.

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	13% 5% 2 5% 5% 3 5% 5% 6% 8% 43%	74962
	Night	14% 6% 2 5% 5% 3 4 5% 5% 7% 44%	74855
Transparency	Day	25% 38% 8% 13% 13% 3	74685
	Night	25% 37% 7% 12% 14% 4	74651
Seeing	Day	16% 9% 23% 24% 19% 8%	14185
	Night	16% 8% 24% 31% 19% 2	24329

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	17% 6% 3 5% 5% 3 3 4 4 6% 46%	1706
	11th to 20th	Day	17% 6% 3 4 5% 2 4 4 5% 6% 44%	1671
	21st to end	Day	16% 6% 3 4 4 3 3 4 4 5% 49%	1782
February	1st to 10th	Day	17% 5% 3 6% 4 3 4 4 5% 6% 43%	1620
	11th to 20th	Day	21% 6% 2 3 4 3 4 3 4 5% 46%	1721
	21st to end	Day	20% 7% 2 6% 5% 3 4 4 4 4 41%	1536
March	1st to 10th	Day	16% 5% 2 3 3 2 3 3 5% 6% 53%	1980
	11th to 20th	Day	17% 6% 2 5% 4 4 5% 5% 6% 7% 40%	1980
	21st to end	Day	17% 6% 2 6% 5% 2 4 5% 4 6% 42%	2178
April	1st to 10th	Day	12% 3 1 4 4 3 4 5% 5% 8% 51%	1980
	11th to 20th	Day	13% 5% 2 5% 4 3 4 5% 5% 7% 47%	2132
	21st to end	Day	12% 4 2 4 4 3 4 4 5% 7% 50%	2276
May	1st to 10th	Day	9% 5% 2 5% 6% 4 5% 6% 6% 8% 45%	2340
	11th to 20th	Day	13% 5% 2 5% 5% 3 6% 6% 6% 8% 40%	2301
	21st to end	Day	10% 6% 3 6% 6% 4 5% 5% 6% 9% 39%	2531
June	1st to 10th	Day	9% 4 3 6% 6% 4 6% 6% 7% 10% 39%	2340
	11th to 20th	Day	9% 4 2 5% 6% 4 6% 7% 6% 9% 41%	2340
	21st to end	Day	7% 4 2 5% 7% 5% 6% 7% 8% 10% 39%	2340
July	1st to 10th	Day	8% 4 3 8% 8% 3 7% 7% 8% 11% 34%	2340
	11th to 20th	Day	8% 5% 3 6% 7% 4 7% 8% 9% 11% 32%	2340
	21st to end	Day	6% 5% 3 7% 6% 5% 7% 7% 7% 12% 35%	2547
August	1st to 10th	Day	12% 5% 3 7% 5% 5% 6% 8% 8% 10% 31%	2327
	11th to 20th	Day	13% 7% 2 6% 7% 5% 7% 7% 8% 10% 28%	2303
	21st to end	Day	11% 6% 3 6% 6% 4 6% 6% 6% 10% 36%	2404
September	1st to 10th	Day	8% 4 2 5% 6% 4 6% 5% 6% 10% 43%	2012
	11th to 20th	Day	12% 6% 3 6% 5% 4 4 5% 7% 9% 41%	1980
	21st to end	Day	18% 6% 2 5% 5% 4 4 4 5% 6% 41%	1980
October	1st to 10th	Day	14% 5% 2 4 4 3 3 3 4 5% 53%	1864
	11th to 20th	Day	13% 4 2 5% 3 2 3 3 4 5% 56%	1800
	21st to end	Day	13% 5% 2 4 3 2 3 3 4 5% 57%	1980
November	1st to 10th	Day	14% 4 2 4 4 1 3 3 3 5% 56%	1857
	11th to 20th	Day	14% 4 2 4 2 2 3 4 5% 6% 54%	1777
	21st to end	Day	16% 4 2 4 4 2 4 5% 4 5% 50%	1710
December	1st to 10th	Day	18% 8% 3 5% 4 3 4 4 5% 6% 40%	1710
	11th to 20th	Day	17% 5% 2 4 3 2 2 3 4 6% 52%	2153
	21st to end	Day	18% 7% 3 4 4 3 3 5% 5% 6% 43%	3124
January	1st to 10th	Night	19% 5% 2 5% 4 3 3 3 4 5% 47%	2459
	11th to 20th	Night	16% 6% 3 5% 4 2 4 4 5% 6% 45%	2417
	21st to end	Night	16% 7% 2 4 3 3 3 3 4 5% 49%	2574
February	1st to 10th	Night	16% 7% 2 5% 6% 3 3 4 5% 5% 46%	2340
	11th to 20th	Night	21% 6% 2 5% 4 2 4 4 4 6% 43%	2120
	21st to end	Night	17% 6% 3 5% 4 2 4 3 5% 7% 44%	1718
March	1st to 10th	Night	15% 6% 2 4 4 2 4 3 4 7% 50%	1980
	11th to 20th	Night	16% 6% 2 5% 5% 3 5% 4 6% 7% 42%	1980
	21st to end	Night	15% 6% 2 5% 6% 3 4 5% 5% 7% 42%	2178
April	1st to 10th	Night	12% 5% 2 4 5% 3 4 4 4 7% 50%	1980
	11th to 20th	Night	12% 4 2 4 5% 3 4 4 4 7% 52%	1775
	21st to end	Night	12% 4 2 4 4 3 4 4 5% 7% 51%	1697
May	1st to 10th	Night	10% 5% 2 5% 5% 2 5% 5% 5% 8% 49%	1620
	11th to 20th	Night	12% 5% 3 7% 6% 4 6% 6% 6% 9% 36%	1592
	21st to end	Night	10% 6% 3 4 5% 3 5% 6% 7% 9% 42%	1744
June	1st to 10th	Night	10% 6% 3 6% 7% 3 7% 7% 7% 9% 35%	1620
	11th to 20th	Night	10% 5% 3 6% 5% 4 6% 8% 8% 11% 35%	1620
	21st to end	Night	8% 5% 3 6% 6% 5% 5% 7% 9% 12% 36%	1620
July	1st to 10th	Night	8% 6% 3 6% 7% 5% 8% 6% 9% 11% 31%	1620
	11th to 20th	Night	8% 5% 2 5% 6% 4 7% 7% 8% 12% 36%	1620
	21st to end	Night	6% 5% 3 8% 6% 4 7% 7% 8% 11% 33%	1771
August	1st to 10th	Night	11% 5% 3 6% 7% 4 5% 7% 8% 13% 33%	1611
	11th to 20th	Night	10% 8% 3 7% 6% 4 5% 7% 7% 9% 34%	1598
	21st to end	Night	9% 6% 3 7% 7% 4 7% 7% 8% 12% 32%	1934
September	1st to 10th	Night	9% 4 2 5% 5% 3 6% 6% 6% 9% 44%	1944
	11th to 20th	Night	12% 6% 3 5% 6% 3 4 6% 6% 8% 42%	1980
	21st to end	Night	17% 6% 3 5% 5% 4 5% 5% 5% 6% 40%	1980
October	1st to 10th	Night	15% 6% 2 3 4 2 3 3 4 6% 53%	2094
	11th to 20th	Night	14% 5% 2 4 3 2 3 4 5% 6% 53%	2160
	21st to end	Night	12% 5% 2 4 4 2 3 3 4 5% 56%	2376
November	1st to 10th	Night	14% 5% 2 4 4 3 2 3 3 6% 54%	2221
	11th to 20th	Night	13% 5% 2 4 4 3 4 4 4 6% 52%	2398
	21st to end	Night	13% 4 3 4 4 3 4 4 5% 7% 49%	2470
December	1st to 10th	Night	18% 7% 3 6% 4 3 3 4 4 5% 42%	2470
	11th to 20th	Night	17% 6% 2 4 4 1 3 3 3 5% 52%	3042
	21st to end	Night	20% 5% 1 5% 5% 2 4 4 5% 6% 44%	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	25% 40% 6% 13% 14% 2	1707
	11th to 20th	Day	27% 40% 5% 11% 14% 3	1671
	21st to end	Day	27% 37% 4 13% 15% 4	1782
February	1st to 10th	Day	28% 36% 7% 13% 13% 3	1620
	11th to 20th	Day	27% 36% 4 13% 16% 4	1731
	21st to end	Day	29% 36% 4 13% 12% 5%	1536
March	1st to 10th	Day	21% 36% 5% 16% 19% 5%	1980
	11th to 20th	Day	30% 37% 8% 11% 10% 4	1980
	21st to end	Day	30% 38% 7% 13% 10% 1	2178
April	1st to 10th	Day	20% 36% 8% 14% 18% 4	1980
	11th to 20th	Day	21% 36% 5% 14% 16% 7%	2132
	21st to end	Day	23% 38% 8% 14% 15% 4	2276
May	1st to 10th	Day	24% 40% 10% 13% 11% 2	2340
	11th to 20th	Day	28% 39% 11% 10% 11% 1	2305
	21st to end	Day	25% 39% 8% 16% 10% 1	2531
June	1st to 10th	Day	26% 40% 10% 16% 8% 1	2340
	11th to 20th	Day	26% 40% 10% 14% 9% 1	2340
	21st to end	Day	23% 41% 10% 14% 9% 2	2340
July	1st to 10th	Day	28% 41% 10% 10% 8% 2	2275
	11th to 20th	Day	26% 43% 14% 10% 6% 1	2271
	21st to end	Day	26% 43% 14% 13% 5%	2405
August	1st to 10th	Day	26% 41% 11% 14% 6% 1	2314
	11th to 20th	Day	31% 40% 11% 12% 7%	2303
	21st to end	Day	30% 39% 11% 12% 6% 1	2404
September	1st to 10th	Day	23% 39% 11% 13% 12% 3	2012
	11th to 20th	Day	26% 38% 7% 12% 15% 2	1980
	21st to end	Day	27% 37% 5% 14% 13% 5%	1980
October	1st to 10th	Day	22% 36% 5% 12% 21% 4	1864
	11th to 20th	Day	23% 36% 6% 15% 17% 5%	1800
	21st to end	Day	21% 36% 5% 15% 18% 6%	1980
November	1st to 10th	Day	15% 40% 4 12% 21% 7%	1857
	11th to 20th	Day	19% 39% 6% 12% 18% 6%	1777
	21st to end	Day	24% 40% 5% 12% 14% 6%	1710
December	1st to 10th	Day	26% 40% 6% 12% 14% 2	1710
	11th to 20th	Day	24% 32% 5% 15% 19% 6%	2150
	21st to end	Day	30% 26% 6% 18% 18% 2	3124
January	1st to 10th	Night	24% 40% 7% 12% 16% 2	2459
	11th to 20th	Night	24% 40% 6% 12% 15% 3	2417
	21st to end	Night	28% 37% 3 13% 15% 4	2574
February	1st to 10th	Night	28% 35% 5% 12% 14% 5%	2340
	11th to 20th	Night	28% 36% 4 11% 16% 5%	2121
	21st to end	Night	28% 36% 6% 12% 14% 5%	1718
March	1st to 10th	Night	22% 36% 5% 12% 18% 7%	1980
	11th to 20th	Night	27% 37% 8% 12% 12% 4	1980
	21st to end	Night	29% 38% 8% 13% 11% 2	2178
April	1st to 10th	Night	21% 37% 7% 13% 17% 5%	1980
	11th to 20th	Night	19% 36% 6% 15% 17% 7%	1775
	21st to end	Night	22% 37% 7% 16% 15% 3	1697
May	1st to 10th	Night	24% 39% 11% 13% 11% 2	1620
	11th to 20th	Night	31% 40% 7% 12% 9% 1	1593
	21st to end	Night	25% 40% 9% 17% 9% 1	1745
June	1st to 10th	Night	28% 39% 10% 12% 8% 1	1620
	11th to 20th	Night	29% 39% 9% 14% 7% 1	1620
	21st to end	Night	23% 44% 10% 12% 8% 3	1620
July	1st to 10th	Night	30% 42% 10% 9% 6% 3	1575
	11th to 20th	Night	24% 43% 16% 10% 5% 2	1566
	21st to end	Night	28% 44% 13% 10% 5%	1672
August	1st to 10th	Night	25% 40% 15% 16% 4 1	1600
	11th to 20th	Night	29% 40% 11% 11% 7% 1	1598
	21st to end	Night	32% 41% 11% 11% 4 1	1934
September	1st to 10th	Night	25% 39% 9% 13% 10% 5%	1944
	11th to 20th	Night	27% 38% 9% 10% 15% 1	1980
	21st to end	Night	27% 37% 7% 11% 14% 5%	1980
October	1st to 10th	Night	22% 36% 6% 12% 21% 5%	2094
	11th to 20th	Night	24% 36% 4 13% 16% 6%	2160
	21st to end	Night	23% 36% 4 13% 18% 6%	2376
November	1st to 10th	Night	15% 40% 5% 11% 19% 10%	2221
	11th to 20th	Night	23% 39% 5% 11% 15% 7%	2398
	21st to end	Night	23% 39% 4 12% 17% 5%	2470
December	1st to 10th	Night	24% 40% 6% 11% 15% 4	2470
	11th to 20th	Night	26% 33% 6% 11% 17% 7%	3044
	21st to end	Night	30% 24% 7% 17% 20% 2	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	22% 19% 40% 17% 3	270
	11th to 20th	Day	23% 20% 33% 18% 5%	257
	21st to end	Day	19% 23% 38% 16% 3 1	264
February	1st to 10th	Day	22% 22% 38% 12% 7%	240
	11th to 20th	Day	35% 15% 40% 8% 1	240
	21st to end	Day	25% 23% 31% 17% 3	254
March	1st to 10th	Day	20% 16% 34% 22% 8%	420
	11th to 20th	Day	21% 15% 40% 19% 5%	420
	21st to end	Day	21% 16% 34% 21% 8% 1	462
April	1st to 10th	Day	18% 16% 32% 21% 11% 2	420
	11th to 20th	Day	13% 17% 30% 22% 15% 3	412
	21st to end	Day	16% 10% 29% 25% 15% 5%	420
May	1st to 10th	Day	11% 12% 35% 22% 16% 4	423
	11th to 20th	Day	15% 4 20% 28% 23% 9%	447
	21st to end	Day	13% 4 16% 27% 28% 12%	485
June	1st to 10th	Day	11% 3 15% 33% 29% 9%	450
	11th to 20th	Day	12% 4 18% 23% 30% 14%	450
	21st to end	Day	8% 3 14% 35% 28% 13%	450
July	1st to 10th	Day	10% 1 9% 24% 36% 21%	445
	11th to 20th	Day	9% 2 9% 28% 34% 18%	444
	21st to end	Day	7% 1 10% 30% 38% 14%	488
August	1st to 10th	Day	13% 3 11% 28% 26% 18%	446
	11th to 20th	Day	14% 3 8% 28% 27% 20%	439
	21st to end	Day	13% 2 10% 27% 28% 20%	495
September	1st to 10th	Day	9% 3 10% 33% 28% 17%	450
	11th to 20th	Day	14% 4 14% 25% 28% 15%	450
	21st to end	Day	20% 5% 18% 26% 26% 6%	450
October	1st to 10th	Day	17% 5% 21% 23% 25% 9%	450
	11th to 20th	Day	13% 7% 25% 25% 24% 7%	450
	21st to end	Day	17% 7% 23% 29% 19% 6%	495
November	1st to 10th	Day	19% 6% 25% 29% 17% 4	455
	11th to 20th	Day	16% 14% 34% 25% 9% 2	337
	21st to end	Day	13% 13% 35% 25% 11% 3	270
December	1st to 10th	Day	23% 15% 40% 16% 7%	270
	11th to 20th	Day	21% 11% 33% 24% 10% 1	270
	21st to end	Day	23% 14% 36% 18% 6% 2	297
January	1st to 10th	Night	21% 13% 34% 25% 6%	760
	11th to 20th	Night	19% 13% 33% 29% 6%	744
	21st to end	Night	19% 11% 39% 27% 4	792
February	1st to 10th	Night	20% 11% 36% 29% 4	720
	11th to 20th	Night	25% 12% 40% 21% 1	703
	21st to end	Night	20% 16% 36% 24% 4	592
March	1st to 10th	Night	17% 10% 36% 32% 5%	720
	11th to 20th	Night	19% 13% 34% 25% 8% 1	720
	21st to end	Night	19% 11% 34% 29% 7%	792
April	1st to 10th	Night	15% 14% 33% 29% 10%	720
	11th to 20th	Night	14% 12% 29% 30% 14% 1	711
	21st to end	Night	14% 6% 30% 35% 14%	617
May	1st to 10th	Night	13% 8% 29% 37% 13%	540
	11th to 20th	Night	14% 6% 25% 33% 22% 1	531
	21st to end	Night	13% 2 13% 39% 31% 3	584
June	1st to 10th	Night	11% 3 16% 41% 24% 5%	540
	11th to 20th	Night	13% 2 16% 32% 31% 7%	540
	21st to end	Night	8% 2 14% 37% 32% 6%	540
July	1st to 10th	Night	9% 2 10% 33% 39% 6%	525
	11th to 20th	Night	8% 2 8% 34% 40% 8%	522
	21st to end	Night	6% 3 10% 33% 42% 6%	591
August	1st to 10th	Night	12% 2 7% 32% 40% 7%	537
	11th to 20th	Night	12% 3 9% 30% 40% 6%	534
	21st to end	Night	10% 2 9% 29% 42% 6%	746
September	1st to 10th	Night	10% 2 8% 31% 42% 6%	720
	11th to 20th	Night	15% 3 11% 29% 38% 5%	720
	21st to end	Night	20% 4 15% 32% 26% 3	720
October	1st to 10th	Night	16% 5% 19% 28% 27% 6%	720
	11th to 20th	Night	17% 6% 23% 31% 21% 2	720
	21st to end	Night	14% 9% 22% 32% 21% 2	792
November	1st to 10th	Night	16% 6% 25% 31% 19% 3	740
	11th to 20th	Night	14% 11% 29% 33% 10% 2	760
	21st to end	Night	16% 8% 27% 35% 13% 1	760
December	1st to 10th	Night	19% 12% 29% 32% 7% 1	760
	11th to 20th	Night	20% 8% 27% 35% 11%	760
	21st to end	Night	25% 11% 24% 31% 8%	836

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