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 2024-12-09.

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% 6% 2 6% 4 4 4 4 6% 8% 42%	101505
	Night	14% 6% 2 6% 4 4 4 4 5% 7% 43%	98231
Transparency	Day	21% 47% 7% 11% 10% 3	105195
	Night	22% 47% 6% 10% 11% 4	102680
Seeing	Day	16% 9% 24% 25% 19% 8%	15429
	Night	16% 8% 24% 31% 19% 2	25520

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% 5% 2 5% 3 3 3 2 4 6% 51%	2836
	11th to 20th	Day	14% 6% 2 5% 4 3 3 3 4 5% 52%	2840
	21st to end	Day	22% 8% 3 5% 3 3 3 3 4 5% 42%	3124
February	1st to 10th	Day	16% 7% 2 6% 3 4 4 3 5% 6% 43%	1710
	11th to 20th	Day	20% 6% 2 4 4 4 3 3 4 4 46%	1819
	21st to end	Day	19% 8% 2 7% 4 4 4 3 4 5% 40%	1630
March	1st to 10th	Day	23% 7% 2 6% 3 3 4 3 4 6% 39%	3435
	11th to 20th	Day	11% 5% 1 5% 3 4 4 3 5% 6% 53%	3480
	21st to end	Day	21% 7% 2 6% 3 3 3 3 4 5% 43%	3815
April	1st to 10th	Day	11% 4 1 5% 3 4 4 4 6% 7% 51%	2090
	11th to 20th	Day	12% 6% 2 6% 4 4 4 4 5% 7% 47%	2252
	21st to end	Day	12% 5% 2 5% 4 4 4 4 5% 7% 50%	2403
May	1st to 10th	Day	11% 7% 2 7% 5% 5% 5% 5% 7% 10% 36%	4082
	11th to 20th	Day	16% 8% 3 7% 4 4 5% 4 5% 8% 37%	4081
	21st to end	Day	7% 4 2 6% 4 4 4 4 6% 10% 48%	4476
June	1st to 10th	Day	9% 5% 2 7% 5% 6% 6% 5% 7% 10% 38%	2470
	11th to 20th	Day	8% 5% 2 6% 6% 5% 6% 5% 6% 9% 42%	2470
	21st to end	Day	7% 4 2 6% 6% 7% 6% 6% 9% 10% 38%	2470
July	1st to 10th	Day	9% 5% 2 9% 6% 5% 6% 5% 8% 10% 33%	4120
	11th to 20th	Day	7% 5% 2 7% 7% 6% 7% 6% 9% 12% 32%	4120
	21st to end	Day	11% 8% 3 9% 6% 7% 7% 6% 8% 11% 25%	4466
August	1st to 10th	Day	21% 7% 3 7% 4 5% 6% 6% 7% 10% 24%	4104
	11th to 20th	Day	11% 6% 2 7% 5% 5% 6% 5% 8% 11% 34%	4044
	21st to end	Day	6% 4 2 5% 3 4 5% 4 6% 9% 51%	4222
September	1st to 10th	Day	8% 5% 2 6% 5% 5% 6% 4 6% 10% 42%	2123
	11th to 20th	Day	13% 7% 3 7% 4 5% 4 4 7% 8% 39%	2090
	21st to end	Day	17% 6% 2 6% 5% 5% 4 4 5% 6% 40%	2090
October	1st to 10th	Day	13% 5% 2 5% 3 3 3 2 4 5% 53%	1967
	11th to 20th	Day	13% 5% 2 5% 3 3 3 2 4 4 58%	1900
	21st to end	Day	13% 5% 2 4 2 3 3 3 4 5% 58%	2090
November	1st to 10th	Day	14% 5% 2 5% 3 3 3 3 4 5% 54%	1957
	11th to 20th	Day	14% 5% 2 4 2 2 4 3 4 7% 54%	1870
	21st to end	Day	15% 4 2 5% 3 3 4 4 4 5% 51%	1800
December	1st to 10th	Day	17% 8% 3 5% 3 4 4 3 5% 6% 42%	1782
	11th to 20th	Day	17% 5% 2 5% 2 2 2 3 5% 5% 52%	2153
	21st to end	Day	18% 7% 2 5% 4 3 4 4 5% 6% 43%	3124
January	1st to 10th	Night	18% 6% 2 5% 3 4 3 3 4 5% 48%	4109
	11th to 20th	Night	12% 7% 2 6% 4 4 3 4 5% 6% 48%	4120
	21st to end	Night	22% 8% 2 5% 3 3 2 2 4 4 45%	4532
February	1st to 10th	Night	15% 7% 2 6% 5% 3 3 3 5% 5% 46%	2470
	11th to 20th	Night	21% 7% 2 6% 3 3 4 3 4 5% 42%	2242
	21st to end	Night	16% 7% 2 5% 4 3 4 3 5% 7% 44%	1822
March	1st to 10th	Night	24% 9% 3 7% 4 3 4 2 4 6% 35%	3418
	11th to 20th	Night	12% 5% 2 5% 3 4 4 3 5% 7% 51%	3480
	21st to end	Night	20% 5% 2 6% 4 4 4 4 4 6% 44%	3817
April	1st to 10th	Night	12% 6% 2 5% 4 3 4 3 5% 7% 49%	2090
	11th to 20th	Night	11% 5% 2 5% 4 4 3 4 4 7% 51%	1875
	21st to end	Night	11% 5% 2 5% 3 4 3 4 5% 7% 51%	1791
May	1st to 10th	Night	14% 7% 2 5% 4 4 5% 3 5% 8% 43%	2813
	11th to 20th	Night	16% 7% 3 7% 4 4 4 3 5% 8% 38%	2812
	21st to end	Night	8% 6% 2 5% 4 4 6% 4 8% 12% 42%	3079
June	1st to 10th	Night	10% 7% 3 7% 6% 5% 7% 5% 7% 9% 35%	1710
	11th to 20th	Night	10% 6% 2 6% 5% 5% 6% 6% 8% 11% 35%	1710
	21st to end	Night	8% 5% 2 6% 6% 6% 5% 5% 9% 12% 36%	1710
July	1st to 10th	Night	11% 7% 3 8% 6% 6% 6% 5% 8% 10% 29%	2840
	11th to 20th	Night	9% 7% 2 7% 5% 6% 6% 7% 10% 12% 31%	2840
	21st to end	Night	15% 9% 4 9% 6% 7% 6% 5% 7% 9% 22%	3087
August	1st to 10th	Night	24% 8% 3 6% 5% 5% 4 4 7% 9% 24%	2825
	11th to 20th	Night	10% 8% 2 7% 5% 6% 7% 5% 8% 10% 33%	2785
	21st to end	Night	6% 4 2 6% 5% 4 5% 4 6% 10% 49%	3402
September	1st to 10th	Night	9% 5% 2 7% 4 4 6% 4 6% 9% 43%	2052
	11th to 20th	Night	13% 7% 3 7% 5% 4 5% 4 6% 8% 40%	2090
	21st to end	Night	17% 7% 2 6% 4 5% 4 4 5% 7% 39%	2090
October	1st to 10th	Night	14% 6% 2 5% 3 3 3 2 4 6% 52%	2211
	11th to 20th	Night	13% 5% 2 4 2 3 3 3 4 6% 55%	2280
	21st to end	Night	11% 5% 2 5% 3 3 3 2 4 5% 57%	2508
November	1st to 10th	Night	14% 5% 2 5% 4 3 2 2 4 6% 53%	2341
	11th to 20th	Night	13% 6% 2 4 4 3 3 3 4 6% 52%	2525
	21st to end	Night	13% 5% 2 4 3 4 3 3 5% 6% 50%	2600
December	1st to 10th	Night	18% 7% 3 6% 3 4 3 3 4 5% 43%	2581
	11th to 20th	Night	17% 6% 2 5% 3 2 3 3 3 5% 51%	3042
	21st to end	Night	19% 5% 2 6% 4 3 4 4 5% 6% 43%	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	23% 36% 3 18% 15% 5%	2837
	11th to 20th	Day	20% 38% 3 11% 23% 5%	2840
	21st to end	Day	29% 40% 2 9% 16% 3	3124
February	1st to 10th	Day	15% 65% 3 8% 7% 2	1710
	11th to 20th	Day	17% 64% 3 6% 8% 2	1829
	21st to end	Day	19% 65% 2 4 8% 2	1630
March	1st to 10th	Day	35% 42% 6% 7% 4 6%	3435
	11th to 20th	Day	15% 41% 4 9% 22% 9%	3480
	21st to end	Day	27% 40% 3 12% 17% 2	3815
April	1st to 10th	Day	13% 65% 4 7% 9% 2	2090
	11th to 20th	Day	16% 66% 4 6% 6% 2	2252
	21st to end	Day	12% 65% 5% 9% 8% 1	2403
May	1st to 10th	Day	27% 43% 10% 13% 6% 1	4120
	11th to 20th	Day	29% 41% 6% 15% 9% 1	4085
	21st to end	Day	15% 43% 12% 13% 14% 3	4489
June	1st to 10th	Day	13% 67% 6% 9% 4 1	2470
	11th to 20th	Day	10% 67% 8% 9% 6%	2470
	21st to end	Day	14% 66% 6% 9% 6%	2470
July	1st to 10th	Day	28% 40% 14% 12% 5%	4055
	11th to 20th	Day	26% 40% 20% 13% 1	4051
	21st to end	Day	37% 40% 9% 11% 2	4324
August	1st to 10th	Day	40% 38% 12% 9% 1	4091
	11th to 20th	Day	24% 40% 12% 15% 8% 1	4083
	21st to end	Day	12% 39% 10% 25% 12% 2	4222
September	1st to 10th	Day	15% 62% 6% 9% 8% 1	2123
	11th to 20th	Day	18% 61% 5% 6% 8% 1	2090
	21st to end	Day	21% 61% 5% 7% 5% 1	2090
October	1st to 10th	Day	19% 37% 4 14% 19% 7%	3266
	11th to 20th	Day	8% 37% 2 11% 19% 23%	3140
	21st to end	Day	14% 36% 2 17% 17% 14%	3428
November	1st to 10th	Day	19% 56% 3 8% 10% 4	1957
	11th to 20th	Day	15% 56% 3 10% 12% 3	1870
	21st to end	Day	14% 57% 5% 10% 11% 3	1800
December	1st to 10th	Day	20% 58% 4 8% 7% 3	1782
	11th to 20th	Day	15% 47% 2 11% 19% 6%	2150
	21st to end	Day	28% 38% 4 15% 13% 2	3124
January	1st to 10th	Night	24% 37% 3 12% 17% 5%	4109
	11th to 20th	Night	23% 38% 5% 10% 19% 5%	4120
	21st to end	Night	29% 39% 2 9% 17% 4	4532
February	1st to 10th	Night	14% 65% 4 8% 8% 2	2470
	11th to 20th	Night	19% 64% 3 5% 8% 2	2243
	21st to end	Night	14% 65% 4 7% 8% 3	1822
March	1st to 10th	Night	38% 42% 6% 7% 4 3	3418
	11th to 20th	Night	17% 41% 3 8% 19% 12%	3480
	21st to end	Night	25% 41% 3 12% 13% 6%	3817
April	1st to 10th	Night	14% 65% 3 7% 8% 3	2090
	11th to 20th	Night	14% 66% 5% 7% 5% 3	1875
	21st to end	Night	11% 65% 6% 10% 6% 2	1791
May	1st to 10th	Night	26% 42% 8% 15% 8% 1	2840
	11th to 20th	Night	26% 42% 7% 15% 10%	2813
	21st to end	Night	16% 44% 10% 19% 10% 1	3087
June	1st to 10th	Night	15% 67% 5% 8% 3 1	1710
	11th to 20th	Night	12% 67% 7% 8% 5%	1710
	21st to end	Night	14% 67% 7% 7% 4 1	1710
July	1st to 10th	Night	31% 41% 13% 9% 5%	2795
	11th to 20th	Night	28% 42% 18% 10% 1	2786
	21st to end	Night	41% 39% 8% 9% 2	2988
August	1st to 10th	Night	41% 39% 11% 7% 1	2814
	11th to 20th	Night	25% 41% 17% 12% 5%	2812
	21st to end	Night	12% 39% 7% 21% 17% 3	3402
September	1st to 10th	Night	13% 63% 7% 8% 8% 1	2052
	11th to 20th	Night	18% 61% 6% 6% 7% 1	2090
	21st to end	Night	20% 62% 5% 8% 4 1	2090
October	1st to 10th	Night	23% 38% 5% 13% 17% 4	3692
	11th to 20th	Night	9% 37% 3 11% 19% 21%	3779
	21st to end	Night	15% 37% 3 14% 17% 14%	4120
November	1st to 10th	Night	20% 55% 3 7% 11% 3	2341
	11th to 20th	Night	16% 57% 2 7% 13% 6%	2525
	21st to end	Night	14% 57% 3 11% 12% 3	2600
December	1st to 10th	Night	22% 58% 3 7% 8% 2	2581
	11th to 20th	Night	17% 48% 3 8% 17% 7%	3044
	21st to end	Night	27% 38% 6% 13% 16% 1	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% 21% 33% 18% 5%	270
	21st to end	Day	19% 23% 39% 15% 3 1	297
February	1st to 10th	Day	21% 21% 37% 14% 7%	270
	11th to 20th	Day	36% 15% 38% 10% 1	270
	21st to end	Day	25% 24% 32% 16% 3	285
March	1st to 10th	Day	22% 16% 32% 21% 8% 1	460
	11th to 20th	Day	19% 14% 41% 19% 5% 1	460
	21st to end	Day	21% 16% 36% 20% 7% 1	506
April	1st to 10th	Day	19% 16% 32% 20% 10% 2	460
	11th to 20th	Day	13% 17% 30% 23% 14% 3	452
	21st to end	Day	15% 10% 29% 26% 15% 4	460
May	1st to 10th	Day	11% 13% 34% 23% 16% 4	463
	11th to 20th	Day	16% 5% 20% 29% 22% 8%	487
	21st to end	Day	12% 3 19% 26% 26% 12%	529
June	1st to 10th	Day	10% 3 16% 34% 27% 9%	490
	11th to 20th	Day	11% 4 17% 25% 29% 13%	490
	21st to end	Day	8% 2 14% 36% 28% 12%	490
July	1st to 10th	Day	9% 1 9% 25% 35% 21%	485
	11th to 20th	Day	9% 2 8% 28% 36% 17%	484
	21st to end	Day	8% 1 11% 31% 35% 14%	532
August	1st to 10th	Day	15% 3 12% 28% 25% 17%	486
	11th to 20th	Day	13% 4 9% 29% 26% 19%	479
	21st to end	Day	12% 2 9% 28% 30% 19%	539
September	1st to 10th	Day	9% 3 11% 34% 26% 16%	490
	11th to 20th	Day	16% 4 15% 24% 26% 14%	490
	21st to end	Day	20% 6% 18% 25% 26% 5%	490
October	1st to 10th	Day	17% 4 21% 24% 25% 9%	490
	11th to 20th	Day	12% 7% 26% 26% 23% 7%	490
	21st to end	Day	16% 6% 22% 30% 20% 6%	539
November	1st to 10th	Day	19% 6% 26% 30% 16% 4	495
	11th to 20th	Day	16% 15% 34% 24% 9% 2	370
	21st to end	Day	14% 13% 35% 25% 10% 3	300
December	1st to 10th	Day	21% 16% 40% 15% 7%	294
	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% 14% 32% 29% 6%	760
	21st to end	Night	19% 11% 37% 28% 4	836
February	1st to 10th	Night	19% 11% 37% 29% 4	760
	11th to 20th	Night	25% 12% 40% 21% 1	743
	21st to end	Night	20% 16% 37% 23% 4	628
March	1st to 10th	Night	18% 11% 35% 31% 5%	760
	11th to 20th	Night	18% 14% 35% 25% 8% 1	760
	21st to end	Night	19% 11% 34% 28% 7%	836
April	1st to 10th	Night	14% 15% 34% 28% 9%	760
	11th to 20th	Night	14% 13% 29% 30% 14% 1	751
	21st to end	Night	13% 6% 30% 37% 14%	651
May	1st to 10th	Night	13% 8% 28% 37% 14%	570
	11th to 20th	Night	14% 6% 24% 33% 22% 1	561
	21st to end	Night	12% 2 14% 39% 30% 2	617
June	1st to 10th	Night	11% 3 16% 41% 24% 5%	570
	11th to 20th	Night	12% 2 15% 33% 31% 7%	570
	21st to end	Night	8% 2 15% 37% 32% 5%	570
July	1st to 10th	Night	9% 2 11% 33% 39% 6%	555
	11th to 20th	Night	9% 2 8% 34% 40% 8%	552
	21st to end	Night	7% 3 11% 34% 40% 5%	624
August	1st to 10th	Night	14% 2 7% 32% 39% 7%	567
	11th to 20th	Night	12% 3 9% 31% 38% 6%	564
	21st to end	Night	10% 2 9% 30% 43% 6%	788
September	1st to 10th	Night	11% 3 9% 31% 41% 6%	760
	11th to 20th	Night	16% 3 10% 28% 37% 4	760
	21st to end	Night	20% 4 15% 33% 25% 3	760
October	1st to 10th	Night	16% 4 18% 29% 27% 6%	760
	11th to 20th	Night	16% 6% 24% 32% 21% 2	760
	21st to end	Night	13% 8% 22% 32% 22% 2	836
November	1st to 10th	Night	17% 6% 25% 32% 18% 3	780
	11th to 20th	Night	14% 11% 30% 33% 10% 2	800
	21st to end	Night	15% 9% 28% 34% 13% 1	800
December	1st to 10th	Night	19% 12% 29% 33% 7% 1	795
	11th to 20th	Night	20% 8% 27% 35% 11%	760
	21st to end	Night	25% 11% 24% 31% 8%	836

Page generated at 2024-12-06 03:54:52. Version ac07

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