Little Pee Dee State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Little Pee Dee State Park clear sky chart from 2005-11-06 to 2025-12-18.

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	12% 6% 2 7% 5% 5% 5% 4 6% 8% 41%	127087
	Night	12% 6% 2 6% 4 4 4 4 6% 8% 44%	123977
Transparency	Day	39% 7% 12% 18% 18% 6%	130692
	Night	37% 7% 12% 18% 20% 7%	128442
Seeing	Day	15% 9% 24% 25% 19% 8%	17097
	Night	15% 7% 25% 33% 18% 2	27195

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% 5% 2 5% 3 3 3 2 3 6% 55%	4056
	11th to 20th	Day	12% 5% 2 4 3 2 3 2 3 6% 57%	4060
	21st to end	Day	12% 9% 3 7% 4 4 4 3 5% 5% 43%	4466
February	1st to 10th	Day	16% 8% 3 6% 5% 4 4 4 5% 6% 41%	1800
	11th to 20th	Day	20% 7% 2 5% 4 3 4 2 4 5% 44%	1823
	21st to end	Day	16% 6% 2 6% 4 4 4 4 6% 6% 42%	1815
March	1st to 10th	Day	19% 8% 3 7% 4 4 4 3 4 5% 40%	4935
	11th to 20th	Day	10% 5% 2 5% 4 3 4 3 5% 7% 53%	4980
	21st to end	Day	13% 5% 2 6% 5% 4 4 3 4 5% 49%	5465
April	1st to 10th	Day	10% 4 1 4 4 4 4 3 7% 8% 50%	2285
	11th to 20th	Day	9% 5% 2 5% 4 5% 5% 4 6% 6% 50%	2374
	21st to end	Day	9% 5% 2 5% 5% 4 4 4 5% 7% 51%	2400
May	1st to 10th	Day	8% 6% 3 8% 5% 5% 6% 5% 8% 11% 35%	5758
	11th to 20th	Day	16% 8% 3 8% 5% 5% 5% 4 7% 9% 31%	5861
	21st to end	Day	10% 6% 2 6% 4 5% 5% 4 7% 8% 43%	6433
June	1st to 10th	Day	9% 6% 3 8% 5% 6% 6% 4 8% 10% 34%	2600
	11th to 20th	Day	9% 5% 2 5% 6% 5% 7% 6% 7% 10% 38%	2600
	21st to end	Day	7% 5% 2 6% 7% 6% 7% 6% 9% 12% 34%	2600
July	1st to 10th	Day	9% 7% 4 10% 7% 7% 7% 6% 8% 10% 25%	5900
	11th to 20th	Day	7% 6% 3 8% 6% 6% 8% 6% 10% 13% 27%	5900
	21st to end	Day	8% 7% 3 8% 7% 7% 7% 6% 9% 11% 26%	6424
August	1st to 10th	Day	22% 9% 3 9% 6% 6% 6% 5% 8% 8% 18%	4234
	11th to 20th	Day	11% 7% 3 7% 5% 5% 6% 5% 7% 11% 33%	4019
	21st to end	Day	7% 4 2 7% 5% 4 6% 5% 7% 11% 42%	4312
September	1st to 10th	Day	8% 5% 2 7% 6% 6% 6% 5% 7% 9% 40%	2400
	11th to 20th	Day	13% 7% 3 7% 4 5% 6% 4 6% 7% 40%	2203
	21st to end	Day	16% 7% 2 7% 4 4 5% 4 6% 7% 38%	2184
October	1st to 10th	Day	14% 6% 2 6% 4 4 4 3 4 8% 45%	2000
	11th to 20th	Day	10% 6% 2 5% 3 3 3 2 3 6% 57%	2000
	21st to end	Day	11% 5% 2 5% 3 3 3 3 4 6% 57%	2200
November	1st to 10th	Day	12% 5% 2 4 3 3 3 3 4 5% 55%	2057
	11th to 20th	Day	13% 6% 2 5% 3 2 3 2 4 5% 53%	2100
	21st to end	Day	12% 6% 1 5% 4 4 3 3 5% 6% 51%	1921
December	1st to 10th	Day	11% 5% 3 6% 4 3 4 3 5% 5% 51%	3020
	11th to 20th	Day	16% 6% 2 6% 3 4 3 3 4 6% 47%	3436
	21st to end	Day	15% 7% 3 7% 4 3 3 3 5% 6% 44%	4466
January	1st to 10th	Night	12% 5% 2 4 3 3 3 3 4 5% 57%	5889
	11th to 20th	Night	12% 6% 2 6% 3 4 4 3 4 6% 49%	5900
	21st to end	Night	12% 9% 3 7% 4 4 4 3 5% 5% 45%	6490
February	1st to 10th	Night	16% 6% 3 6% 4 4 3 3 5% 7% 45%	2600
	11th to 20th	Night	18% 7% 2 6% 4 4 4 3 4 6% 42%	2456
	21st to end	Night	13% 6% 1 6% 4 4 4 3 5% 7% 47%	1815
March	1st to 10th	Night	18% 9% 3 7% 4 4 3 3 4 5% 39%	4918
	11th to 20th	Night	11% 5% 2 5% 3 3 4 4 5% 8% 51%	4980
	21st to end	Night	12% 4 2 6% 4 4 4 3 5% 6% 51%	5467
April	1st to 10th	Night	12% 4 2 5% 4 4 4 4 6% 7% 49%	2112
	11th to 20th	Night	9% 5% 2 6% 4 3 4 3 5% 6% 52%	1975
	21st to end	Night	8% 4 2 5% 4 4 4 4 6% 7% 52%	2000
May	1st to 10th	Night	7% 6% 3 6% 4 5% 5% 5% 8% 11% 41%	4178
	11th to 20th	Night	15% 8% 3 7% 4 5% 4 4 5% 10% 35%	4032
	21st to end	Night	11% 6% 2 6% 4 5% 5% 4 6% 10% 40%	4421
June	1st to 10th	Night	10% 6% 3 7% 5% 5% 6% 6% 8% 10% 35%	1800
	11th to 20th	Night	10% 6% 3 5% 5% 6% 5% 4 7% 10% 39%	1800
	21st to end	Night	6% 4 2 6% 6% 5% 7% 6% 8% 12% 36%	1800
July	1st to 10th	Night	10% 7% 3 10% 7% 6% 6% 6% 8% 10% 26%	4058
	11th to 20th	Night	10% 6% 3 8% 5% 6% 6% 6% 9% 15% 26%	4057
	21st to end	Night	11% 9% 4 10% 6% 7% 7% 5% 8% 10% 24%	4427
August	1st to 10th	Night	21% 8% 3 7% 5% 5% 6% 4 6% 9% 25%	2915
	11th to 20th	Night	8% 6% 3 8% 6% 5% 6% 6% 7% 10% 35%	2994
	21st to end	Night	7% 5% 2 5% 4 5% 5% 5% 8% 10% 46%	3586
September	1st to 10th	Night	8% 5% 2 6% 6% 6% 4 4 7% 10% 42%	2000
	11th to 20th	Night	12% 6% 3 8% 6% 4 4 4 6% 7% 40%	2192
	21st to end	Night	15% 7% 3 7% 5% 4 5% 3 5% 6% 40%	2215
October	1st to 10th	Night	12% 7% 2 5% 3 3 4 3 5% 7% 48%	2400
	11th to 20th	Night	11% 5% 2 5% 3 3 3 3 3 6% 56%	2400
	21st to end	Night	10% 5% 2 4 3 3 3 3 5% 6% 56%	2640
November	1st to 10th	Night	13% 6% 2 5% 3 3 3 2 4 5% 55%	2461
	11th to 20th	Night	13% 8% 2 4 3 4 3 2 4 6% 51%	2520
	21st to end	Night	12% 5% 2 5% 4 3 3 4 6% 7% 50%	2695
December	1st to 10th	Night	12% 7% 2 5% 3 3 4 3 4 5% 52%	4380
	11th to 20th	Night	14% 7% 3 7% 5% 4 4 4 4 5% 44%	4914
	21st to end	Night	15% 7% 3 6% 4 4 4 3 5% 6% 45%	6490

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	32% 4 6% 18% 32% 7%	4057
	11th to 20th	Day	31% 4 5% 17% 33% 11%	4060
	21st to end	Day	42% 4 5% 15% 22% 11%	4466
February	1st to 10th	Day	44% 5% 10% 18% 19% 5%	1800
	11th to 20th	Day	44% 4 6% 18% 22% 7%	1832
	21st to end	Day	41% 5% 9% 16% 19% 8%	1815
March	1st to 10th	Day	48% 5% 6% 12% 21% 9%	4935
	11th to 20th	Day	30% 5% 8% 14% 27% 16%	4980
	21st to end	Day	38% 5% 7% 19% 22% 9%	5465
April	1st to 10th	Day	31% 6% 11% 21% 25% 6%	2285
	11th to 20th	Day	33% 6% 10% 20% 21% 10%	2374
	21st to end	Day	32% 6% 12% 23% 22% 5%	2400
May	1st to 10th	Day	39% 10% 17% 24% 9% 1	5792
	11th to 20th	Day	47% 9% 14% 19% 11% 1	5865
	21st to end	Day	35% 9% 14% 19% 20% 3	6447
June	1st to 10th	Day	41% 10% 16% 21% 12% 1	2600
	11th to 20th	Day	36% 11% 19% 21% 11% 3	2600
	21st to end	Day	37% 13% 16% 22% 10% 2	2600
July	1st to 10th	Day	49% 11% 19% 16% 4 1	5835
	11th to 20th	Day	41% 16% 30% 10% 2 1	5831
	21st to end	Day	46% 13% 16% 17% 8% 1	6240
August	1st to 10th	Day	60% 11% 15% 10% 4	4221
	11th to 20th	Day	42% 11% 16% 20% 11%	4058
	21st to end	Day	33% 9% 15% 30% 12% 1	4312
September	1st to 10th	Day	37% 11% 15% 17% 15% 5%	2400
	11th to 20th	Day	42% 8% 11% 16% 18% 5%	2203
	21st to end	Day	44% 6% 11% 18% 15% 4	2184
October	1st to 10th	Day	37% 4 8% 20% 25% 6%	3260
	11th to 20th	Day	20% 3 5% 17% 27% 27%	3240
	21st to end	Day	26% 3 5% 20% 29% 16%	3538
November	1st to 10th	Day	31% 4 9% 17% 29% 10%	2057
	11th to 20th	Day	34% 4 8% 18% 27% 10%	2100
	21st to end	Day	34% 5% 8% 20% 24% 9%	1921
December	1st to 10th	Day	35% 5% 7% 16% 25% 12%	3020
	11th to 20th	Day	39% 4 10% 21% 20% 5%	3433
	21st to end	Day	40% 4 10% 21% 22% 2	4466
January	1st to 10th	Night	30% 4 7% 16% 37% 7%	5889
	11th to 20th	Night	35% 5% 7% 14% 32% 7%	5900
	21st to end	Night	40% 5% 6% 13% 26% 10%	6490
February	1st to 10th	Night	40% 5% 8% 20% 20% 7%	2600
	11th to 20th	Night	43% 5% 8% 15% 21% 8%	2458
	21st to end	Night	36% 6% 11% 16% 21% 10%	1815
March	1st to 10th	Night	46% 5% 8% 10% 24% 6%	4918
	11th to 20th	Night	31% 5% 9% 11% 26% 18%	4980
	21st to end	Night	34% 5% 9% 21% 21% 10%	5467
April	1st to 10th	Night	33% 6% 11% 18% 23% 9%	2112
	11th to 20th	Night	31% 7% 10% 21% 20% 11%	1975
	21st to end	Night	31% 7% 13% 24% 21% 5%	2000
May	1st to 10th	Night	33% 10% 18% 23% 13% 2	4207
	11th to 20th	Night	43% 9% 17% 20% 11%	4033
	21st to end	Night	35% 10% 16% 22% 15% 2	4429
June	1st to 10th	Night	38% 14% 14% 22% 10% 1	1800
	11th to 20th	Night	38% 11% 18% 22% 10% 1	1800
	21st to end	Night	35% 13% 22% 21% 8% 2	1800
July	1st to 10th	Night	49% 11% 22% 13% 3 1	4015
	11th to 20th	Night	44% 15% 31% 8% 3	4006
	21st to end	Night	52% 11% 14% 19% 5%	4297
August	1st to 10th	Night	55% 11% 20% 12% 3	2904
	11th to 20th	Night	40% 12% 20% 20% 6%	3021
	21st to end	Night	31% 8% 16% 33% 12% 1	3586
September	1st to 10th	Night	35% 10% 18% 18% 14% 5%	2000
	11th to 20th	Night	42% 9% 12% 17% 16% 4	2192
	21st to end	Night	45% 7% 12% 20% 13% 4	2215
October	1st to 10th	Night	37% 5% 9% 19% 25% 6%	3920
	11th to 20th	Night	21% 3 5% 14% 26% 30%	3899
	21st to end	Night	25% 4 7% 22% 26% 16%	4252
November	1st to 10th	Night	32% 5% 8% 17% 26% 13%	2461
	11th to 20th	Night	35% 4 8% 14% 27% 11%	2520
	21st to end	Night	33% 5% 9% 21% 24% 9%	2695
December	1st to 10th	Night	35% 4 7% 14% 28% 12%	4380
	11th to 20th	Night	42% 5% 11% 16% 18% 8%	4916
	21st to end	Night	39% 6% 9% 20% 23% 2	6490

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	19% 22% 39% 17% 3	300
	11th to 20th	Day	16% 21% 37% 21% 6%	300
	21st to end	Day	20% 22% 38% 16% 4	330
February	1st to 10th	Day	17% 21% 35% 23% 4	300
	11th to 20th	Day	35% 16% 34% 12% 2	315
	21st to end	Day	18% 20% 35% 21% 6% 1	414
March	1st to 10th	Day	17% 20% 32% 23% 8%	500
	11th to 20th	Day	18% 18% 37% 19% 7% 1	500
	21st to end	Day	17% 15% 37% 21% 9% 1	550
April	1st to 10th	Day	17% 16% 33% 23% 10% 2	500
	11th to 20th	Day	12% 16% 27% 23% 17% 6%	492
	21st to end	Day	12% 11% 28% 26% 18% 6%	500
May	1st to 10th	Day	10% 13% 33% 23% 15% 6%	503
	11th to 20th	Day	14% 6% 23% 29% 23% 6%	527
	21st to end	Day	17% 6% 18% 23% 23% 12%	573
June	1st to 10th	Day	12% 4 18% 31% 25% 10%	530
	11th to 20th	Day	12% 4 14% 31% 25% 15%	530
	21st to end	Day	8% 3 13% 29% 30% 18%	530
July	1st to 10th	Day	9% 3 11% 25% 33% 20%	525
	11th to 20th	Day	10% 3 7% 23% 37% 20%	524
	21st to end	Day	6% 2 11% 27% 39% 15%	576
August	1st to 10th	Day	17% 3 13% 25% 27% 16%	526
	11th to 20th	Day	14% 2 8% 24% 31% 22%	519
	21st to end	Day	13% 2 11% 25% 30% 19%	583
September	1st to 10th	Day	9% 4 13% 31% 25% 18%	530
	11th to 20th	Day	15% 4 14% 26% 30% 12%	530
	21st to end	Day	18% 3 17% 31% 21% 9%	530
October	1st to 10th	Day	15% 7% 20% 28% 20% 9%	530
	11th to 20th	Day	12% 8% 24% 28% 20% 6%	530
	21st to end	Day	12% 7% 27% 26% 22% 5%	583
November	1st to 10th	Day	15% 7% 27% 30% 15% 4	535
	11th to 20th	Day	17% 11% 33% 28% 10% 2	540
	21st to end	Day	13% 15% 32% 25% 12% 2	361
December	1st to 10th	Day	20% 16% 39% 16% 9%	330
	11th to 20th	Day	20% 14% 32% 25% 8% 2	321
	21st to end	Day	20% 14% 38% 17% 8% 3	330
January	1st to 10th	Night	17% 14% 36% 27% 6%	800
	11th to 20th	Night	17% 12% 33% 30% 8%	800
	21st to end	Night	18% 13% 35% 30% 3	880
February	1st to 10th	Night	20% 12% 33% 30% 5%	800
	11th to 20th	Night	21% 15% 37% 25% 2	783
	21st to end	Night	17% 13% 38% 29% 4	660
March	1st to 10th	Night	17% 12% 34% 30% 6%	800
	11th to 20th	Night	17% 11% 39% 26% 7%	800
	21st to end	Night	15% 13% 38% 28% 7%	880
April	1st to 10th	Night	15% 16% 32% 31% 7%	800
	11th to 20th	Night	12% 10% 35% 30% 12%	791
	21st to end	Night	11% 8% 32% 39% 10%	800
May	1st to 10th	Night	11% 6% 33% 35% 14%	669
	11th to 20th	Night	13% 6% 25% 41% 15% 1	591
	21st to end	Night	10% 3 15% 38% 31% 3	650
June	1st to 10th	Night	13% 3 16% 45% 22% 2	600
	11th to 20th	Night	13% 3 15% 37% 27% 6%	600
	21st to end	Night	8% 2 14% 37% 36% 4	600
July	1st to 10th	Night	9% 2 11% 39% 35% 5%	585
	11th to 20th	Night	10% 1 6% 34% 41% 7%	582
	21st to end	Night	7% 1 10% 41% 38% 4	657
August	1st to 10th	Night	15% 2 8% 32% 38% 5%	597
	11th to 20th	Night	10% 1 9% 37% 37% 6%	661
	21st to end	Night	12% 2 10% 35% 36% 5%	880
September	1st to 10th	Night	10% 2 13% 34% 36% 5%	800
	11th to 20th	Night	16% 1 14% 35% 28% 6%	800
	21st to end	Night	18% 4 17% 34% 24% 3	800
October	1st to 10th	Night	16% 4 19% 33% 26% 4	800
	11th to 20th	Night	15% 5% 24% 32% 22% 3	800
	21st to end	Night	12% 6% 25% 34% 20% 3	880
November	1st to 10th	Night	15% 7% 24% 35% 17% 2	820
	11th to 20th	Night	17% 11% 27% 33% 11% 1	840
	21st to end	Night	14% 8% 30% 31% 15% 1	840
December	1st to 10th	Night	20% 10% 27% 35% 7% 1	840
	11th to 20th	Night	18% 9% 26% 35% 11% 1	829
	21st to end	Night	19% 11% 30% 30% 9% 1	880

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