Pickett CCC Memorial State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pickett CCC Memorial State Park clear sky chart from 2005-11-06 to 2026-07-01.

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% 9% 3 8% 5% 5% 5% 4 6% 7% 36%	137546
	Night	13% 9% 3 8% 5% 4 4 3 5% 7% 39%	134834
Transparency	Day	44% 7% 11% 21% 14% 2	141259
	Night	42% 6% 11% 22% 16% 3	139192
Seeing	Day	19% 13% 25% 22% 15% 6%	16873
	Night	18% 11% 24% 28% 17% 3	26908

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	16% 11% 7% 12% 5% 4 5% 3 4 4 28%	5258
	11th to 20th	Day	13% 10% 6% 14% 4 3 3 2 3 4 39%	5280
	21st to end	Day	18% 12% 5% 7% 6% 3 4 3 4 6% 32%	5855
February	1st to 10th	Day	15% 13% 4 9% 5% 5% 4 3 5% 5% 31%	2100
	11th to 20th	Day	21% 10% 5% 9% 5% 4 3 3 4 5% 31%	2048
	21st to end	Day	18% 11% 4 9% 4 4 3 4 4 5% 34%	1730
March	1st to 10th	Day	16% 13% 5% 8% 4 4 4 3 5% 5% 33%	4616
	11th to 20th	Day	12% 9% 3 7% 4 4 4 3 4 6% 44%	5090
	21st to end	Day	12% 9% 2 7% 4 4 5% 3 6% 6% 41%	5586
April	1st to 10th	Day	12% 8% 3 6% 5% 4 4 4 7% 8% 40%	2470
	11th to 20th	Day	13% 9% 3 5% 4 4 5% 4 5% 6% 42%	2494
	21st to end	Day	14% 7% 3 7% 5% 5% 4 4 6% 8% 37%	2711
May	1st to 10th	Day	16% 10% 3 7% 5% 5% 5% 4 6% 8% 31%	7616
	11th to 20th	Day	12% 8% 3 8% 6% 5% 5% 4 6% 7% 34%	7626
	21st to end	Day	17% 10% 4 10% 6% 6% 5% 4 5% 7% 27%	8391
June	1st to 10th	Day	11% 6% 3 6% 6% 5% 6% 4 7% 9% 36%	2730
	11th to 20th	Day	7% 5% 2 5% 5% 6% 6% 5% 8% 10% 41%	2730
	21st to end	Day	7% 5% 2 6% 5% 5% 6% 6% 9% 12% 38%	2730
July	1st to 10th	Day	7% 4 2 7% 6% 6% 6% 5% 8% 10% 38%	5900
	11th to 20th	Day	8% 6% 2 8% 6% 7% 7% 6% 8% 10% 30%	5900
	21st to end	Day	13% 9% 3 9% 6% 6% 6% 6% 8% 10% 23%	6424
August	1st to 10th	Day	8% 5% 2 6% 5% 6% 5% 5% 8% 10% 40%	4234
	11th to 20th	Day	8% 5% 3 7% 5% 5% 6% 6% 8% 12% 35%	3989
	21st to end	Day	6% 4 2 5% 4 5% 5% 4 6% 8% 50%	4312
September	1st to 10th	Day	14% 7% 3 6% 5% 4 5% 4 5% 7% 39%	2266
	11th to 20th	Day	13% 7% 2 7% 5% 5% 5% 3 6% 8% 40%	2200
	21st to end	Day	16% 5% 2 5% 4 4 4 4 6% 6% 45%	2200
October	1st to 10th	Day	10% 5% 2 5% 3 3 3 3 6% 7% 52%	2200
	11th to 20th	Day	12% 5% 2 5% 4 3 4 3 5% 5% 52%	2085
	21st to end	Day	17% 7% 2 4 4 3 4 3 6% 7% 44%	2095
November	1st to 10th	Day	11% 7% 2 6% 3 3 3 3 5% 6% 51%	1852
	11th to 20th	Day	14% 9% 2 5% 3 4 4 2 5% 7% 44%	1890
	21st to end	Day	14% 11% 3 6% 4 4 4 4 5% 6% 40%	1890
December	1st to 10th	Day	15% 11% 3 8% 4 3 4 3 4 5% 39%	3020
	11th to 20th	Day	18% 16% 6% 9% 4 4 4 3 4 5% 26%	3463
	21st to end	Day	15% 14% 6% 9% 5% 4 5% 4 6% 7% 25%	4565
January	1st to 10th	Night	14% 13% 5% 11% 4 3 3 3 4 5% 34%	7635
	11th to 20th	Night	15% 12% 4 9% 5% 5% 3 2 3 4 39%	7680
	21st to end	Night	16% 14% 4 9% 5% 4 4 3 3 4 36%	8323
February	1st to 10th	Night	16% 10% 4 9% 5% 5% 4 4 5% 6% 31%	2520
	11th to 20th	Night	22% 10% 4 9% 4 4 3 2 5% 4 31%	2458
	21st to end	Night	20% 12% 4 9% 5% 4 3 2 4 6% 31%	2076
March	1st to 10th	Night	16% 13% 4 7% 4 4 4 3 4 6% 33%	5457
	11th to 20th	Night	11% 7% 2 5% 4 4 4 4 5% 7% 48%	5090
	21st to end	Night	13% 9% 3 8% 5% 5% 5% 3 5% 6% 37%	5588
April	1st to 10th	Night	11% 8% 3 6% 4 5% 4 4 6% 6% 44%	2167
	11th to 20th	Night	13% 7% 3 6% 4 3 3 4 6% 6% 45%	2075
	21st to end	Night	12% 8% 3 7% 5% 4 4 3 5% 8% 41%	1907
May	1st to 10th	Night	14% 8% 3 8% 5% 5% 5% 5% 7% 8% 31%	5237
	11th to 20th	Night	12% 8% 3 8% 5% 5% 5% 4 6% 8% 35%	5234
	21st to end	Night	15% 9% 3 8% 6% 5% 5% 4 6% 8% 31%	5761
June	1st to 10th	Night	8% 6% 2 6% 5% 5% 6% 5% 7% 9% 42%	1890
	11th to 20th	Night	5% 4 1 6% 4 4 5% 4 8% 10% 48%	1890
	21st to end	Night	6% 4 2 5% 5% 5% 6% 5% 8% 12% 42%	1890
July	1st to 10th	Night	6% 5% 2 6% 4 5% 6% 5% 8% 10% 43%	4058
	11th to 20th	Night	7% 5% 2 6% 5% 5% 6% 5% 8% 12% 39%	4057
	21st to end	Night	9% 8% 3 9% 6% 6% 6% 5% 7% 12% 28%	4427
August	1st to 10th	Night	6% 4 3 6% 5% 4 4 4 7% 10% 47%	2915
	11th to 20th	Night	6% 5% 2 7% 5% 5% 5% 5% 7% 10% 44%	3055
	21st to end	Night	5% 3 1 3 3 3 4 3 5% 9% 61%	3586
September	1st to 10th	Night	10% 6% 3 7% 4 4 4 4 5% 7% 46%	2112
	11th to 20th	Night	11% 6% 2 7% 4 4 5% 3 6% 7% 47%	2200
	21st to end	Night	12% 5% 3 6% 4 3 3 4 5% 6% 50%	2200
October	1st to 10th	Night	10% 4 2 4 2 3 3 2 4 7% 58%	2200
	11th to 20th	Night	14% 5% 1 4 3 4 4 2 4 6% 52%	2313
	21st to end	Night	14% 8% 2 6% 4 3 3 2 4 7% 48%	2742
November	1st to 10th	Night	11% 7% 2 6% 4 3 3 3 4 6% 51%	2666
	11th to 20th	Night	12% 9% 2 6% 4 3 3 3 5% 7% 46%	2730
	21st to end	Night	14% 11% 3 7% 4 3 3 2 4 6% 42%	2730
December	1st to 10th	Night	14% 13% 4 11% 5% 5% 3 2 4 4 35%	4380
	11th to 20th	Night	20% 14% 5% 10% 3 3 3 2 4 4 32%	4952
	21st to end	Night	13% 13% 6% 9% 6% 6% 6% 4 6% 7% 24%	6633

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	58% 5% 9% 18% 9% 1	5259
	11th to 20th	Day	50% 4 4 18% 22% 2	5280
	21st to end	Day	53% 3 8% 22% 12% 2	5855
February	1st to 10th	Day	54% 5% 7% 17% 15% 1	2100
	11th to 20th	Day	57% 3 7% 18% 12% 2	2058
	21st to end	Day	52% 4 9% 16% 14% 5%	1730
March	1st to 10th	Day	51% 5% 6% 14% 16% 7%	4616
	11th to 20th	Day	40% 5% 8% 22% 20% 6%	5090
	21st to end	Day	42% 6% 10% 27% 14% 1	5586
April	1st to 10th	Day	40% 6% 12% 24% 15% 3	2470
	11th to 20th	Day	42% 5% 8% 21% 21% 3	2494
	21st to end	Day	44% 7% 12% 25% 12% 2	2711
May	1st to 10th	Day	48% 7% 13% 22% 10% 1	7651
	11th to 20th	Day	46% 8% 13% 21% 12% 1	7630
	21st to end	Day	54% 8% 10% 15% 10% 2	8405
June	1st to 10th	Day	41% 9% 12% 21% 15% 2	2730
	11th to 20th	Day	34% 11% 16% 21% 16% 1	2730
	21st to end	Day	35% 10% 17% 20% 13% 4	2730
July	1st to 10th	Day	35% 11% 18% 22% 13% 1	5835
	11th to 20th	Day	41% 13% 20% 21% 5% 1	5831
	21st to end	Day	50% 11% 16% 18% 5%	6240
August	1st to 10th	Day	33% 10% 17% 26% 12%	4221
	11th to 20th	Day	35% 10% 17% 24% 12% 1	4028
	21st to end	Day	28% 8% 13% 37% 13% 2	4311
September	1st to 10th	Day	43% 8% 11% 18% 18% 4	2266
	11th to 20th	Day	41% 7% 10% 22% 18% 2	2200
	21st to end	Day	38% 6% 11% 23% 19% 4	2200
October	1st to 10th	Day	24% 5% 7% 21% 38% 4	3590
	11th to 20th	Day	24% 3 10% 23% 31% 9%	3377
	21st to end	Day	31% 4 9% 27% 20% 10%	3358
November	1st to 10th	Day	35% 4 9% 23% 26% 4	1852
	11th to 20th	Day	40% 3 8% 23% 21% 5%	1890
	21st to end	Day	45% 4 8% 20% 20% 3	1890
December	1st to 10th	Day	46% 5% 7% 19% 22% 1	3020
	11th to 20th	Day	60% 4 7% 16% 11% 2	3460
	21st to end	Day	55% 6% 12% 18% 7% 1	4565
January	1st to 10th	Night	51% 6% 13% 20% 9% 1	7636
	11th to 20th	Night	50% 4 5% 18% 20% 4	7680
	21st to end	Night	52% 3 7% 16% 17% 4	8323
February	1st to 10th	Night	53% 5% 10% 18% 13% 1	2520
	11th to 20th	Night	56% 3 7% 18% 12% 4	2459
	21st to end	Night	56% 4 7% 15% 16% 3	2076
March	1st to 10th	Night	51% 5% 8% 16% 15% 4	5457
	11th to 20th	Night	35% 5% 8% 25% 19% 8%	5090
	21st to end	Night	46% 5% 11% 25% 12% 1	5588
April	1st to 10th	Night	38% 6% 11% 24% 18% 3	2167
	11th to 20th	Night	38% 4 11% 21% 21% 5%	2075
	21st to end	Night	41% 7% 11% 27% 14% 1	1907
May	1st to 10th	Night	47% 9% 12% 22% 9% 1	5264
	11th to 20th	Night	45% 8% 16% 18% 13%	5235
	21st to end	Night	47% 10% 13% 18% 11% 1	5771
June	1st to 10th	Night	35% 8% 14% 26% 15% 2	1890
	11th to 20th	Night	28% 9% 19% 26% 17% 1	1890
	21st to end	Night	32% 9% 17% 24% 14% 3	1890
July	1st to 10th	Night	32% 11% 19% 24% 14% 1	4015
	11th to 20th	Night	33% 10% 23% 25% 7% 2	4006
	21st to end	Night	45% 11% 19% 20% 5% 1	4297
August	1st to 10th	Night	29% 9% 16% 32% 14% 1	2904
	11th to 20th	Night	32% 8% 20% 28% 12% 1	3082
	21st to end	Night	20% 7% 13% 40% 18% 2	3586
September	1st to 10th	Night	35% 9% 12% 19% 19% 5%	2112
	11th to 20th	Night	36% 7% 9% 25% 21% 2	2200
	21st to end	Night	35% 6% 10% 21% 24% 4	2200
October	1st to 10th	Night	22% 5% 8% 24% 33% 7%	3590
	11th to 20th	Night	23% 3 7% 26% 27% 14%	3760
	21st to end	Night	25% 4 9% 24% 26% 12%	4429
November	1st to 10th	Night	36% 4 7% 23% 24% 6%	2666
	11th to 20th	Night	38% 5% 7% 21% 23% 6%	2730
	21st to end	Night	45% 3 7% 24% 18% 3	2730
December	1st to 10th	Night	53% 4 7% 17% 18% 1	4380
	11th to 20th	Night	55% 4 7% 19% 14% 2	4954
	21st to end	Night	55% 8% 11% 17% 9%	6633

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	28% 26% 32% 11% 2 1	330
	11th to 20th	Day	36% 30% 22% 10% 2	330
	21st to end	Day	27% 31% 32% 9% 1	363
February	1st to 10th	Day	28% 28% 30% 13% 2	330
	11th to 20th	Day	39% 27% 26% 6% 1	330
	21st to end	Day	38% 24% 31% 5% 1	273
March	1st to 10th	Day	31% 24% 33% 9% 4	340
	11th to 20th	Day	28% 24% 30% 14% 4 1	540
	21st to end	Day	28% 19% 33% 14% 5% 1	594
April	1st to 10th	Day	26% 20% 28% 17% 9% 1	540
	11th to 20th	Day	22% 20% 30% 18% 9% 1	532
	21st to end	Day	21% 17% 31% 19% 10% 2	540
May	1st to 10th	Day	21% 16% 35% 16% 9% 3	543
	11th to 20th	Day	16% 13% 28% 24% 13% 6%	567
	21st to end	Day	18% 10% 23% 25% 16% 8%	617
June	1st to 10th	Day	12% 9% 21% 31% 19% 9%	570
	11th to 20th	Day	7% 6% 22% 31% 25% 10%	570
	21st to end	Day	8% 5% 24% 29% 24% 11%	570
July	1st to 10th	Day	10% 5% 15% 28% 26% 17%	525
	11th to 20th	Day	9% 6% 14% 30% 28% 14%	524
	21st to end	Day	13% 4 13% 29% 28% 13%	576
August	1st to 10th	Day	15% 3 16% 27% 28% 11%	526
	11th to 20th	Day	10% 4 18% 35% 24% 9%	519
	21st to end	Day	12% 4 11% 28% 28% 17%	583
September	1st to 10th	Day	14% 4 15% 26% 27% 13%	530
	11th to 20th	Day	13% 5% 13% 28% 29% 12%	530
	21st to end	Day	17% 7% 22% 28% 18% 8%	530
October	1st to 10th	Day	11% 7% 20% 32% 25% 5%	530
	11th to 20th	Day	15% 14% 25% 26% 16% 3	530
	21st to end	Day	26% 10% 28% 26% 8% 2	478
November	1st to 10th	Day	19% 14% 36% 23% 5% 3	330
	11th to 20th	Day	20% 19% 39% 18% 3	330
	21st to end	Day	21% 21% 36% 13% 8%	330
December	1st to 10th	Day	29% 22% 35% 11% 3	330
	11th to 20th	Day	29% 19% 32% 15% 4 1	330
	21st to end	Day	31% 23% 32% 12% 3	363
January	1st to 10th	Night	24% 22% 29% 22% 4	840
	11th to 20th	Night	30% 21% 28% 18% 3	840
	21st to end	Night	22% 19% 36% 20% 2	924
February	1st to 10th	Night	25% 17% 33% 22% 3	840
	11th to 20th	Night	29% 19% 34% 17% 1	823
	21st to end	Night	31% 19% 31% 18% 1	692
March	1st to 10th	Night	24% 14% 34% 24% 4	840
	11th to 20th	Night	24% 16% 32% 22% 5% 1	840
	21st to end	Night	21% 15% 33% 24% 7%	924
April	1st to 10th	Night	18% 16% 30% 27% 9%	697
	11th to 20th	Night	17% 13% 34% 25% 11%	623
	21st to end	Night	15% 9% 34% 31% 9% 1	630
May	1st to 10th	Night	16% 8% 29% 30% 14% 3	630
	11th to 20th	Night	13% 9% 24% 33% 19% 3	621
	21st to end	Night	9% 5% 23% 32% 26% 5%	683
June	1st to 10th	Night	9% 4 17% 39% 26% 5%	630
	11th to 20th	Night	5% 2 16% 42% 29% 7%	630
	21st to end	Night	6% 3 15% 39% 30% 6%	630
July	1st to 10th	Night	10% 2 9% 31% 41% 8%	585
	11th to 20th	Night	7% 2 10% 30% 43% 7%	582
	21st to end	Night	8% 2 8% 35% 40% 7%	657
August	1st to 10th	Night	11% 3 8% 31% 41% 7%	597
	11th to 20th	Night	9% 2 9% 37% 35% 7%	594
	21st to end	Night	9% 2 7% 34% 39% 9%	660
September	1st to 10th	Night	11% 3 10% 29% 40% 6%	712
	11th to 20th	Night	13% 3 11% 32% 36% 6%	800
	21st to end	Night	14% 4 17% 33% 28% 5%	800
October	1st to 10th	Night	13% 5% 17% 32% 28% 7%	800
	11th to 20th	Night	17% 9% 22% 33% 18% 2	800
	21st to end	Night	17% 10% 28% 28% 15% 2	880
November	1st to 10th	Night	14% 11% 24% 34% 16% 2	820
	11th to 20th	Night	18% 14% 29% 28% 9% 1	840
	21st to end	Night	21% 15% 28% 26% 9%	840
December	1st to 10th	Night	26% 17% 27% 24% 5%	840
	11th to 20th	Night	23% 17% 28% 25% 5% 1	840
	21st to end	Night	27% 18% 28% 24% 4	924

Page generated at 2026-06-28 01:10:50. Version ac07

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