Poinsett State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Poinsett 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	13% 6% 2 6% 4 4 5% 4 6% 8% 42%	127162
	Night	13% 6% 2 6% 4 4 4 4 6% 8% 44%	123877
Transparency	Day	38% 6% 12% 19% 18% 6%	130808
	Night	38% 6% 11% 18% 20% 8%	128300
Seeing	Day	15% 10% 24% 24% 19% 8%	16928
	Night	15% 9% 24% 32% 18% 2	27006

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	14% 5% 2 5% 2 3 3 3 4 6% 54%	4056
	11th to 20th	Day	11% 5% 2 4 3 3 3 2 3 6% 57%	4060
	21st to end	Day	14% 8% 3 7% 5% 3 4 3 4 5% 44%	4466
February	1st to 10th	Day	15% 7% 2 6% 5% 4 4 4 5% 7% 43%	1800
	11th to 20th	Day	19% 8% 2 5% 3 3 3 2 4 4 45%	1928
	21st to end	Day	16% 6% 2 6% 4 3 4 3 4 6% 44%	1750
March	1st to 10th	Day	21% 9% 3 6% 4 3 4 3 4 5% 39%	4935
	11th to 20th	Day	8% 4 2 4 4 4 4 3 5% 7% 54%	4980
	21st to end	Day	13% 6% 2 6% 4 4 4 3 4 5% 47%	5465
April	1st to 10th	Day	10% 4 2 5% 4 4 4 3 6% 8% 50%	2200
	11th to 20th	Day	10% 5% 1 5% 5% 4 4 3 6% 7% 50%	2374
	21st to end	Day	8% 5% 2 4 5% 4 4 4 6% 8% 50%	2458
May	1st to 10th	Day	10% 6% 3 7% 5% 5% 5% 4 7% 11% 37%	5862
	11th to 20th	Day	17% 7% 2 7% 5% 5% 5% 4 7% 8% 33%	5861
	21st to end	Day	11% 5% 2 6% 5% 4 5% 4 6% 8% 44%	6433
June	1st to 10th	Day	10% 5% 2 7% 6% 5% 5% 5% 8% 11% 36%	2600
	11th to 20th	Day	7% 4 2 5% 5% 6% 7% 6% 7% 11% 40%	2600
	21st to end	Day	5% 4 2 7% 6% 6% 7% 6% 8% 11% 39%	2600
July	1st to 10th	Day	14% 7% 3 8% 7% 7% 7% 6% 7% 10% 24%	5900
	11th to 20th	Day	6% 4 2 7% 6% 7% 7% 6% 11% 15% 30%	5900
	21st to end	Day	10% 7% 3 7% 6% 6% 7% 6% 8% 12% 29%	6424
August	1st to 10th	Day	24% 6% 2 7% 5% 6% 6% 5% 7% 11% 21%	4234
	11th to 20th	Day	11% 6% 2 7% 5% 5% 6% 5% 8% 10% 36%	4148
	21st to end	Day	7% 4 2 6% 4 5% 5% 5% 8% 10% 44%	4312
September	1st to 10th	Day	8% 5% 2 7% 5% 5% 6% 5% 7% 9% 42%	2244
	11th to 20th	Day	14% 6% 2 7% 4 4 5% 4 6% 9% 40%	2200
	21st to end	Day	18% 6% 2 6% 4 3 5% 4 5% 7% 41%	2200
October	1st to 10th	Day	13% 7% 2 6% 4 3 4 3 5% 6% 48%	2061
	11th to 20th	Day	10% 4 2 5% 3 3 3 3 3 7% 58%	2000
	21st to end	Day	11% 4 2 5% 3 3 3 3 4 4 58%	2200
November	1st to 10th	Day	13% 4 2 3 3 3 3 3 4 6% 54%	2057
	11th to 20th	Day	14% 6% 2 5% 3 2 2 2 4 7% 52%	2042
	21st to end	Day	13% 5% 2 6% 3 3 4 3 5% 6% 50%	1890
December	1st to 10th	Day	12% 5% 2 5% 4 4 4 4 5% 5% 51%	3020
	11th to 20th	Day	15% 6% 2 6% 4 3 3 3 5% 7% 47%	3436
	21st to end	Day	20% 7% 2 5% 3 3 3 3 4 5% 44%	4466
January	1st to 10th	Night	12% 5% 2 5% 3 3 4 3 3 5% 56%	5889
	11th to 20th	Night	12% 5% 2 5% 4 4 4 3 5% 7% 48%	5900
	21st to end	Night	14% 9% 3 6% 3 4 4 3 4 5% 47%	6490
February	1st to 10th	Night	16% 6% 2 5% 4 4 4 4 5% 7% 44%	2600
	11th to 20th	Night	19% 7% 2 6% 4 3 3 3 5% 5% 43%	2353
	21st to end	Night	13% 5% 2 7% 4 4 4 3 5% 6% 46%	1879
March	1st to 10th	Night	19% 9% 3 6% 4 4 3 3 5% 6% 39%	4918
	11th to 20th	Night	11% 4 1 4 3 3 3 3 5% 8% 54%	4980
	21st to end	Night	13% 4 2 5% 4 4 3 3 5% 7% 49%	5467
April	1st to 10th	Night	10% 5% 2 5% 4 4 4 3 6% 7% 50%	2197
	11th to 20th	Night	11% 5% 2 5% 3 2 3 2 6% 7% 53%	1975
	21st to end	Night	8% 4 2 5% 4 4 5% 4 6% 6% 53%	1957
May	1st to 10th	Night	8% 6% 2 7% 5% 5% 5% 4 7% 10% 41%	4033
	11th to 20th	Night	17% 7% 2 5% 4 4 4 4 7% 10% 36%	4032
	21st to end	Night	12% 5% 2 6% 4 4 5% 4 6% 9% 42%	4421
June	1st to 10th	Night	11% 6% 3 6% 5% 5% 6% 6% 8% 11% 34%	1800
	11th to 20th	Night	8% 6% 2 7% 5% 4 6% 4 7% 10% 41%	1800
	21st to end	Night	6% 5% 2 6% 5% 5% 6% 7% 10% 12% 36%	1800
July	1st to 10th	Night	14% 8% 3 8% 6% 6% 6% 5% 9% 11% 25%	4058
	11th to 20th	Night	8% 5% 3 8% 6% 6% 7% 6% 10% 13% 28%	4057
	21st to end	Night	12% 8% 3 10% 6% 7% 6% 5% 8% 10% 25%	4427
August	1st to 10th	Night	23% 7% 3 7% 6% 5% 5% 5% 7% 10% 22%	2915
	11th to 20th	Night	10% 7% 2 7% 5% 5% 6% 5% 7% 10% 35%	2875
	21st to end	Night	7% 4 2 5% 4 5% 5% 4 6% 12% 47%	3576
September	1st to 10th	Night	8% 6% 2 7% 7% 5% 6% 4 6% 9% 40%	2151
	11th to 20th	Night	12% 7% 3 8% 5% 4 5% 4 6% 7% 40%	2200
	21st to end	Night	16% 7% 3 6% 4 5% 4 4 5% 7% 39%	2200
October	1st to 10th	Night	13% 6% 2 5% 3 3 4 3 4 6% 51%	2337
	11th to 20th	Night	13% 4 1 4 3 3 3 3 5% 5% 56%	2400
	21st to end	Night	10% 5% 2 5% 3 3 3 2 5% 5% 57%	2640
November	1st to 10th	Night	13% 6% 2 5% 3 3 3 2 4 5% 55%	2461
	11th to 20th	Night	13% 7% 2 4 3 3 3 3 4 6% 52%	2575
	21st to end	Night	12% 5% 2 5% 4 3 3 3 5% 7% 49%	2730
December	1st to 10th	Night	14% 5% 2 5% 3 3 3 3 4 5% 53%	4380
	11th to 20th	Night	16% 7% 3 6% 4 3 3 3 5% 5% 45%	4914
	21st to end	Night	19% 7% 2 5% 4 3 4 3 5% 6% 42%	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% 3 5% 20% 33% 7%	4057
	11th to 20th	Day	31% 2 4 16% 37% 9%	4060
	21st to end	Day	42% 4 4 17% 22% 12%	4466
February	1st to 10th	Day	42% 4 8% 21% 19% 6%	1800
	11th to 20th	Day	44% 3 5% 17% 24% 7%	1938
	21st to end	Day	41% 5% 7% 17% 21% 9%	1750
March	1st to 10th	Day	49% 3 5% 13% 21% 9%	4935
	11th to 20th	Day	30% 4 8% 16% 25% 17%	4980
	21st to end	Day	40% 3 8% 18% 22% 10%	5465
April	1st to 10th	Day	32% 4 12% 21% 24% 7%	2200
	11th to 20th	Day	33% 4 10% 22% 20% 11%	2374
	21st to end	Day	30% 5% 11% 27% 23% 4	2458
May	1st to 10th	Day	40% 6% 16% 25% 11% 2	5897
	11th to 20th	Day	47% 6% 16% 19% 11% 1	5865
	21st to end	Day	36% 6% 14% 20% 21% 2	6447
June	1st to 10th	Day	40% 8% 16% 24% 11% 1	2600
	11th to 20th	Day	34% 8% 20% 24% 13% 1	2600
	21st to end	Day	35% 10% 19% 23% 12% 1	2600
July	1st to 10th	Day	50% 10% 17% 17% 4 1	5835
	11th to 20th	Day	37% 15% 33% 11% 3 1	5831
	21st to end	Day	43% 12% 17% 21% 6%	6240
August	1st to 10th	Day	55% 9% 20% 12% 3	4221
	11th to 20th	Day	40% 9% 17% 23% 12%	4187
	21st to end	Day	33% 7% 15% 32% 13% 1	4312
September	1st to 10th	Day	36% 8% 16% 18% 17% 5%	2244
	11th to 20th	Day	40% 7% 12% 19% 20% 3	2200
	21st to end	Day	43% 5% 9% 22% 16% 5%	2200
October	1st to 10th	Day	36% 4 7% 18% 27% 8%	3360
	11th to 20th	Day	19% 2 6% 17% 29% 27%	3240
	21st to end	Day	25% 3 5% 20% 32% 15%	3538
November	1st to 10th	Day	32% 4 7% 20% 26% 12%	2057
	11th to 20th	Day	35% 2 7% 19% 26% 10%	2042
	21st to end	Day	35% 3 9% 20% 23% 9%	1890
December	1st to 10th	Day	35% 4 6% 18% 27% 10%	3020
	11th to 20th	Day	39% 3 10% 22% 20% 6%	3433
	21st to end	Day	43% 3 7% 22% 23% 2	4466
January	1st to 10th	Night	32% 3 4 18% 36% 7%	5889
	11th to 20th	Night	36% 3 5% 16% 32% 7%	5900
	21st to end	Night	41% 4 5% 13% 28% 9%	6490
February	1st to 10th	Night	40% 3 8% 20% 21% 8%	2600
	11th to 20th	Night	44% 4 6% 18% 20% 8%	2354
	21st to end	Night	39% 4 8% 18% 19% 13%	1879
March	1st to 10th	Night	47% 3 7% 12% 22% 9%	4918
	11th to 20th	Night	29% 4 6% 12% 29% 19%	4980
	21st to end	Night	35% 4 8% 22% 20% 12%	5467
April	1st to 10th	Night	34% 4 12% 19% 22% 10%	2197
	11th to 20th	Night	31% 3 11% 21% 23% 11%	1975
	21st to end	Night	30% 5% 12% 25% 21% 6%	1957
May	1st to 10th	Night	37% 7% 16% 25% 13% 2	4060
	11th to 20th	Night	42% 8% 20% 18% 12%	4033
	21st to end	Night	36% 8% 12% 24% 19% 2	4429
June	1st to 10th	Night	39% 10% 17% 21% 11% 1	1800
	11th to 20th	Night	37% 9% 20% 23% 10% 2	1800
	21st to end	Night	34% 13% 21% 22% 9% 2	1800
July	1st to 10th	Night	50% 11% 20% 15% 4 1	4015
	11th to 20th	Night	42% 15% 30% 10% 3	4006
	21st to end	Night	53% 10% 16% 17% 4	4297
August	1st to 10th	Night	55% 8% 22% 12% 2 1	2904
	11th to 20th	Night	42% 10% 21% 20% 7%	2902
	21st to end	Night	29% 7% 17% 34% 12% 1	3576
September	1st to 10th	Night	39% 9% 15% 20% 12% 6%	2151
	11th to 20th	Night	43% 7% 12% 19% 17% 3	2200
	21st to end	Night	44% 6% 13% 18% 15% 4	2200
October	1st to 10th	Night	35% 4 8% 18% 27% 7%	3818
	11th to 20th	Night	20% 2 5% 15% 25% 33%	3899
	21st to end	Night	24% 3 6% 21% 28% 18%	4252
November	1st to 10th	Night	32% 3 8% 16% 26% 14%	2461
	11th to 20th	Night	34% 3 8% 16% 28% 12%	2575
	21st to end	Night	35% 3 8% 20% 23% 11%	2730
December	1st to 10th	Night	35% 3 7% 16% 29% 10%	4380
	11th to 20th	Night	42% 4 9% 18% 18% 9%	4916
	21st to end	Night	43% 3 6% 22% 23% 3	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	18% 21% 45% 12% 3	300
	11th to 20th	Day	16% 23% 36% 21% 4 1	300
	21st to end	Day	22% 24% 38% 14% 2	330
February	1st to 10th	Day	17% 21% 40% 17% 5%	300
	11th to 20th	Day	34% 19% 34% 10% 2	300
	21st to end	Day	21% 18% 38% 18% 5% 1	349
March	1st to 10th	Day	19% 19% 30% 22% 9%	500
	11th to 20th	Day	18% 19% 38% 18% 6%	500
	21st to end	Day	17% 19% 37% 19% 8% 1	550
April	1st to 10th	Day	14% 19% 34% 22% 10% 1	500
	11th to 20th	Day	11% 16% 29% 23% 17% 3	492
	21st to end	Day	10% 9% 28% 28% 18% 6%	500
May	1st to 10th	Day	11% 15% 31% 24% 13% 6%	503
	11th to 20th	Day	16% 7% 20% 27% 21% 8%	527
	21st to end	Day	13% 6% 18% 26% 22% 14%	573
June	1st to 10th	Day	11% 4 18% 31% 27% 9%	530
	11th to 20th	Day	9% 4 16% 29% 27% 15%	530
	21st to end	Day	6% 2 15% 31% 31% 16%	530
July	1st to 10th	Day	8% 3 8% 24% 32% 24%	525
	11th to 20th	Day	7% 2 6% 25% 39% 21%	524
	21st to end	Day	7% 3 10% 28% 35% 17%	576
August	1st to 10th	Day	19% 4 11% 26% 25% 16%	526
	11th to 20th	Day	13% 4 7% 26% 32% 18%	519
	21st to end	Day	14% 3 11% 26% 28% 18%	583
September	1st to 10th	Day	9% 3 15% 26% 32% 14%	530
	11th to 20th	Day	16% 3 13% 26% 31% 10%	530
	21st to end	Day	22% 3 15% 25% 25% 10%	530
October	1st to 10th	Day	17% 5% 21% 28% 19% 8%	530
	11th to 20th	Day	12% 7% 24% 29% 22% 7%	530
	21st to end	Day	13% 8% 25% 30% 19% 5%	583
November	1st to 10th	Day	17% 7% 29% 26% 16% 6%	535
	11th to 20th	Day	19% 10% 38% 23% 8% 2	482
	21st to end	Day	11% 14% 38% 26% 9% 2	330
December	1st to 10th	Day	22% 15% 40% 16% 7% 1	330
	11th to 20th	Day	20% 13% 37% 21% 7% 1	321
	21st to end	Day	26% 15% 35% 14% 8% 2	330
January	1st to 10th	Night	19% 15% 33% 27% 7%	800
	11th to 20th	Night	18% 13% 33% 29% 7%	800
	21st to end	Night	19% 14% 36% 28% 3	880
February	1st to 10th	Night	20% 14% 31% 32% 4	800
	11th to 20th	Night	21% 17% 34% 26% 2	783
	21st to end	Night	16% 16% 36% 28% 4	660
March	1st to 10th	Night	17% 14% 34% 29% 7%	800
	11th to 20th	Night	17% 13% 37% 27% 6%	800
	21st to end	Night	15% 16% 35% 26% 8%	880
April	1st to 10th	Night	16% 16% 34% 27% 8%	800
	11th to 20th	Night	13% 12% 32% 31% 12% 1	791
	21st to end	Night	9% 9% 32% 39% 10%	757
May	1st to 10th	Night	11% 8% 31% 38% 12% 1	600
	11th to 20th	Night	13% 5% 29% 35% 15% 2	591
	21st to end	Night	11% 3 14% 39% 30% 3	650
June	1st to 10th	Night	12% 3 17% 41% 23% 3	600
	11th to 20th	Night	10% 2 15% 38% 28% 8%	600
	21st to end	Night	8% 2 12% 41% 33% 5%	600
July	1st to 10th	Night	10% 3 8% 36% 35% 8%	585
	11th to 20th	Night	7% 2 7% 34% 43% 7%	582
	21st to end	Night	8% 3 8% 39% 36% 6%	657
August	1st to 10th	Night	15% 3 7% 31% 38% 6%	597
	11th to 20th	Night	11% 2 9% 35% 37% 7%	594
	21st to end	Night	13% 3 9% 31% 37% 6%	870
September	1st to 10th	Night	10% 4 11% 32% 38% 5%	800
	11th to 20th	Night	16% 3 11% 33% 33% 5%	800
	21st to end	Night	19% 5% 14% 31% 28% 3	800
October	1st to 10th	Night	16% 3 18% 34% 26% 4	800
	11th to 20th	Night	15% 6% 21% 32% 23% 2	800
	21st to end	Night	12% 8% 24% 32% 21% 3	880
November	1st to 10th	Night	15% 8% 24% 34% 16% 3	820
	11th to 20th	Night	17% 10% 28% 31% 13% 1	840
	21st to end	Night	13% 10% 31% 29% 15% 2	840
December	1st to 10th	Night	20% 11% 28% 31% 9%	840
	11th to 20th	Night	18% 10% 26% 34% 11% 1	829
	21st to end	Night	25% 12% 25% 29% 9% 1	880

Page generated at 2025-12-15 01:13:54. Version ac07

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