Limekiln State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Limekiln State Park clear sky chart from 2005-11-06 to 2026-08-30.

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	6% 3 1 3 2 2 3 3 5% 6% 67%	151866
	Night	7% 4 1 3 2 2 2 3 6% 5% 64%	147915
Transparency	Day	12% 33% 5% 12% 18% 20%	146848
	Night	15% 33% 4 10% 17% 21%	143918
Seeing	Day	8% 7% 21% 34% 24% 5%	17971
	Night	8% 4 14% 33% 32% 9%	27420

By Month

Percentage Cloud Cover SW (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% 3 3 4 3 5% 6% 50%	5183
	11th to 20th	Day	9% 4 2 4 3 3 3 3 4 6% 61%	5340
	21st to end	Day	11% 7% 2 6% 4 4 4 4 6% 8% 44%	5843
February	1st to 10th	Day	17% 6% 2 4 3 3 3 4 4 5% 50%	1890
	11th to 20th	Day	13% 6% 2 6% 4 3 4 3 6% 8% 46%	2025
	21st to end	Day	12% 8% 2 3 4 4 4 4 5% 7% 47%	1730
March	1st to 10th	Day	12% 8% 2 7% 5% 4 4 4 7% 7% 38%	4922
	11th to 20th	Day	12% 5% 2 5% 3 3 3 3 4 6% 54%	5110
	21st to end	Day	12% 7% 2 5% 4 4 5% 5% 6% 9% 41%	5740
April	1st to 10th	Day	10% 5% 2 4 4 3 4 4 5% 7% 53%	2520
	11th to 20th	Day	8% 4 1 4 3 3 4 3 6% 6% 57%	2489
	21st to end	Day	5% 4 2 3 3 3 3 4 5% 7% 61%	2520
May	1st to 10th	Day	3 2 1 2 2 2 2 2 4 5% 75%	7058
	11th to 20th	Day	1 1 1 1 1 2 3 3 7% 79%	7479
	21st to end	Day	2 1 1 2 1 1 2 4 5% 6% 75%	8992
June	1st to 10th	Day	1 2 1 2 2 2 2 3 6% 7% 72%	2940
	11th to 20th	Day	1 1 1 1 1 1 3 5% 5% 80%	2940
	21st to end	Day	1 1 1 1 1 1 1 2 3 4 85%	2940
July	1st to 10th	Day	1 1 1 3 7% 5% 82%	8072
	11th to 20th	Day	2 2 1 2 2 1 2 1 8% 6% 73%	7650
	21st to end	Day	1 1 1 2 3 9% 6% 77%	8304
August	1st to 10th	Day	1 1 1 1 2 2 3 3 86%	5866
	11th to 20th	Day	1 1 1 1 1 2 3 92%	5484
	21st to end	Day	1 1 1 1 1 1 3 5% 85%	6093
September	1st to 10th	Day	1 1 1 1 2 2 3 4 85%	2400
	11th to 20th	Day	2 1 2 2 1 2 2 2 6% 80%	2400
	21st to end	Day	2 2 1 2 2 1 3 2 3 5% 77%	2150
October	1st to 10th	Day	1 1 1 2 2 2 2 3 5% 5% 77%	3280
	11th to 20th	Day	3 2 1 2 2 2 2 2 2 4 79%	3261
	21st to end	Day	4 4 1 4 3 2 3 3 5% 6% 66%	3558
November	1st to 10th	Day	7% 5% 1 3 2 2 3 2 5% 7% 64%	2036
	11th to 20th	Day	9% 4 2 4 2 2 3 4 4 6% 60%	1890
	21st to end	Day	11% 4 1 4 3 4 3 3 4 6% 57%	1861
December	1st to 10th	Day	8% 5% 2 4 2 4 3 3 6% 7% 54%	2700
	11th to 20th	Day	21% 6% 2 4 3 3 3 3 5% 7% 42%	3108
	21st to end	Day	21% 8% 2 5% 4 4 4 4 6% 7% 33%	4092
January	1st to 10th	Night	16% 7% 2 4 2 2 2 2 3 6% 53%	7718
	11th to 20th	Night	9% 5% 2 3 2 3 3 3 5% 7% 59%	7650
	21st to end	Night	12% 7% 2 6% 4 3 3 4 6% 7% 45%	8371
February	1st to 10th	Night	16% 6% 2 4 4 3 3 3 4 5% 51%	2730
	11th to 20th	Night	13% 5% 1 4 3 3 3 3 5% 7% 51%	2480
	21st to end	Night	11% 7% 3 5% 4 3 3 3 5% 6% 52%	2076
March	1st to 10th	Night	16% 9% 2 7% 5% 4 4 3 6% 6% 38%	5187
	11th to 20th	Night	12% 7% 2 4 2 3 3 3 4 6% 55%	5110
	21st to end	Night	14% 11% 2 5% 3 3 3 3 5% 7% 45%	5476
April	1st to 10th	Night	7% 6% 2 5% 4 3 3 3 5% 6% 55%	2100
	11th to 20th	Night	7% 5% 2 4 4 3 3 3 4 6% 61%	2079
	21st to end	Night	3 4 2 3 3 3 3 3 7% 8% 62%	2100
May	1st to 10th	Night	1 2 1 2 2 2 2 3 7% 4 74%	5919
	11th to 20th	Night	1 1 1 1 1 2 4 6% 6% 76%	5398
	21st to end	Night	1 2 1 2 1 1 2 3 6% 3 78%	5181
June	1st to 10th	Night	2 2 1 1 1 1 2 3 7% 6% 74%	1680
	11th to 20th	Night	1 1 1 2 1 1 1 2 5% 5% 80%	1680
	21st to end	Night	1 1 1 1 1 2 4 4 85%	1680
July	1st to 10th	Night	1 1 13% 3 82%	4876
	11th to 20th	Night	1 2 1 2 2 2 2 2 10% 4 73%	5340
	21st to end	Night	1 1 1 2 3 17% 4 70%	5806
August	1st to 10th	Night	1 1 1 1 1 1 2 3 3 87%	4165
	11th to 20th	Night	1 1 1 1 1 2 2 93%	4606
	21st to end	Night	1 1 1 1 1 1 4 4 85%	5105
September	1st to 10th	Night	1 1 1 1 1 1 3 3 87%	2000
	11th to 20th	Night	2 2 1 2 1 1 1 1 3 4 81%	2000
	21st to end	Night	2 2 1 2 1 1 2 1 4 3 82%	2243
October	1st to 10th	Night	2 2 1 2 1 2 2 2 4 5% 77%	3920
	11th to 20th	Night	2 2 1 2 2 2 2 2 3 4 78%	3897
	21st to end	Night	4 4 1 2 1 2 3 2 4 5% 72%	4253
November	1st to 10th	Night	6% 4 1 3 3 2 2 2 4 5% 68%	2481
	11th to 20th	Night	9% 5% 2 4 2 3 3 3 5% 7% 60%	2730
	21st to end	Night	7% 5% 2 5% 3 3 4 3 5% 6% 57%	2756
December	1st to 10th	Night	8% 4 2 4 3 3 3 3 5% 5% 60%	4700
	11th to 20th	Night	19% 7% 2 5% 4 3 4 4 7% 6% 40%	5316
	21st to end	Night	19% 8% 3 7% 5% 4 4 4 5% 6% 35%	7106

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	26% 23% 9% 18% 16% 7%	5184
	11th to 20th	Day	21% 22% 5% 6% 15% 32%	5340
	21st to end	Day	29% 22% 4 12% 21% 12%	5843
February	1st to 10th	Day	19% 60% 4 5% 7% 6%	1890
	11th to 20th	Day	18% 58% 4 9% 7% 4	2035
	21st to end	Day	13% 60% 5% 10% 8% 3	1730
March	1st to 10th	Day	29% 32% 8% 8% 19% 4	4922
	11th to 20th	Day	22% 29% 7% 22% 12% 9%	5110
	21st to end	Day	25% 33% 9% 20% 11% 1	5740
April	1st to 10th	Day	14% 59% 3 12% 8% 4	2520
	11th to 20th	Day	9% 60% 5% 12% 10% 3	2492
	21st to end	Day	8% 60% 7% 12% 11% 3	2520
May	1st to 10th	Day	10% 22% 4 20% 34% 11%	7058
	11th to 20th	Day	4 21% 10% 21% 29% 14%	7482
	21st to end	Day	6% 21% 6% 20% 32% 14%	8994
June	1st to 10th	Day	3 58% 5% 11% 16% 7%	2940
	11th to 20th	Day	2 58% 3 10% 14% 13%	2940
	21st to end	Day	3 56% 2 6% 13% 21%	2940
July	1st to 10th	Day	2 18% 1 4 17% 58%	8006
	11th to 20th	Day	10% 19% 2 5% 11% 53%	7581
	21st to end	Day	3 18% 2 10% 25% 42%	8119
August	1st to 10th	Day	7% 33% 1 7% 18% 33%	4306
	11th to 20th	Day	2 33% 2 10% 19% 35%	4000
	21st to end	Day	4 33% 2 12% 20% 28%	4420
September	1st to 10th	Day	2 56% 3 10% 15% 15%	2400
	11th to 20th	Day	6% 56% 5% 10% 13% 11%	2400
	21st to end	Day	6% 56% 3 8% 16% 11%	2150
October	1st to 10th	Day	6% 35% 2 5% 14% 38%	3280
	11th to 20th	Day	7% 35% 3 13% 26% 16%	3261
	21st to end	Day	13% 34% 2 9% 27% 14%	3558
November	1st to 10th	Day	6% 53% 3 11% 15% 12%	2036
	11th to 20th	Day	16% 55% 5% 8% 11% 6%	1890
	21st to end	Day	14% 54% 5% 10% 10% 7%	1861
December	1st to 10th	Day	18% 35% 3 10% 20% 14%	2700
	11th to 20th	Day	30% 31% 6% 9% 12% 11%	3108
	21st to end	Day	34% 28% 8% 15% 10% 5%	4092
January	1st to 10th	Night	28% 21% 9% 17% 17% 8%	7718
	11th to 20th	Night	20% 22% 4 8% 13% 33%	7650
	21st to end	Night	29% 22% 4 9% 19% 17%	8371
February	1st to 10th	Night	19% 59% 3 5% 8% 6%	2730
	11th to 20th	Night	16% 59% 3 8% 11% 4	2481
	21st to end	Night	12% 59% 4 11% 9% 5%	2076
March	1st to 10th	Night	34% 31% 5% 8% 16% 6%	5187
	11th to 20th	Night	22% 29% 6% 20% 13% 11%	5110
	21st to end	Night	29% 30% 7% 16% 16% 3	5476
April	1st to 10th	Night	14% 59% 3 10% 10% 4	2100
	11th to 20th	Night	11% 59% 4 11% 12% 4	2079
	21st to end	Night	9% 59% 6% 13% 10% 4	2100
May	1st to 10th	Night	8% 21% 7% 16% 30% 17%	5917
	11th to 20th	Night	5% 21% 6% 15% 26% 27%	5399
	21st to end	Night	5% 21% 4 17% 29% 24%	5182
June	1st to 10th	Night	3 58% 3 9% 17% 10%	1680
	11th to 20th	Night	3 57% 2 9% 13% 16%	1680
	21st to end	Night	1 56% 1 4 12% 26%	1680
July	1st to 10th	Night	1 18% 1 3 18% 59%	4834
	11th to 20th	Night	9% 18% 1 4 12% 55%	5286
	21st to end	Night	3 18% 1 7% 23% 46%	5679
August	1st to 10th	Night	6% 33% 1 4 14% 42%	3047
	11th to 20th	Night	2 33% 1 7% 11% 46%	3356
	21st to end	Night	4 33% 1 9% 18% 35%	3698
September	1st to 10th	Night	2 56% 2 7% 13% 21%	2000
	11th to 20th	Night	5% 56% 2 9% 14% 14%	2000
	21st to end	Night	5% 56% 2 8% 16% 13%	2243
October	1st to 10th	Night	6% 34% 2 5% 11% 42%	3920
	11th to 20th	Night	7% 35% 3 9% 28% 18%	3897
	21st to end	Night	11% 34% 2 8% 26% 19%	4253
November	1st to 10th	Night	7% 52% 2 11% 16% 12%	2481
	11th to 20th	Night	16% 54% 3 8% 13% 6%	2730
	21st to end	Night	15% 56% 5% 7% 11% 7%	2756
December	1st to 10th	Night	16% 34% 4 10% 20% 16%	4700
	11th to 20th	Night	31% 32% 6% 7% 13% 11%	5316
	21st to end	Night	38% 27% 5% 14% 12% 4	7106

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	29% 10% 24% 21% 12% 3	383
	11th to 20th	Day	14% 7% 23% 31% 20% 4	430
	21st to end	Day	14% 11% 26% 28% 18% 4	473
February	1st to 10th	Day	21% 13% 20% 21% 19% 5%	430
	11th to 20th	Day	20% 13% 27% 24% 14% 1	522
	21st to end	Day	12% 15% 29% 29% 15% 1	446
March	1st to 10th	Day	20% 14% 29% 28% 9% 1	540
	11th to 20th	Day	19% 10% 28% 25% 16% 2	540
	21st to end	Day	15% 11% 31% 33% 9%	594
April	1st to 10th	Day	14% 10% 30% 29% 15% 2	540
	11th to 20th	Day	11% 13% 29% 30% 15% 2	532
	21st to end	Day	8% 10% 31% 30% 16% 4	540
May	1st to 10th	Day	7% 9% 29% 31% 20% 4	543
	11th to 20th	Day	7% 7% 26% 35% 21% 5%	568
	21st to end	Day	5% 8% 22% 36% 22% 6%	617
June	1st to 10th	Day	2 4 22% 40% 23% 9%	570
	11th to 20th	Day	1 5% 24% 42% 23% 5%	570
	21st to end	Day	1 3 17% 44% 26% 9%	570
July	1st to 10th	Day	1 1 16% 40% 36% 7%	566
	11th to 20th	Day	2 7% 39% 40% 11%	564
	21st to end	Day	1 10% 41% 38% 10%	619
August	1st to 10th	Day	2 1 13% 46% 29% 9%	567
	11th to 20th	Day	1 1 14% 42% 32% 10%	557
	21st to end	Day	2 1 10% 43% 37% 7%	620
September	1st to 10th	Day	1 3 14% 40% 36% 6%	530
	11th to 20th	Day	4 4 18% 38% 32% 5%	530
	21st to end	Day	3 6% 15% 36% 34% 5%	530
October	1st to 10th	Day	3 5% 22% 34% 31% 5%	530
	11th to 20th	Day	5% 5% 20% 32% 31% 7%	530
	21st to end	Day	6% 5% 20% 34% 28% 6%	583
November	1st to 10th	Day	7% 8% 18% 29% 32% 6%	512
	11th to 20th	Day	14% 8% 20% 30% 22% 6%	330
	21st to end	Day	11% 7% 25% 29% 23% 4	313
December	1st to 10th	Day	15% 8% 24% 31% 18% 4	220
	11th to 20th	Day	14% 12% 22% 25% 20% 7%	220
	21st to end	Day	19% 16% 25% 24% 13% 4	242
January	1st to 10th	Night	19% 5% 17% 30% 20% 8%	840
	11th to 20th	Night	13% 5% 15% 33% 26% 8%	840
	21st to end	Night	16% 3 16% 36% 25% 4	924
February	1st to 10th	Night	18% 7% 15% 30% 23% 6%	840
	11th to 20th	Night	15% 7% 19% 31% 21% 7%	824
	21st to end	Night	13% 8% 23% 33% 21% 2	692
March	1st to 10th	Night	17% 7% 20% 32% 19% 4	840
	11th to 20th	Night	14% 6% 18% 32% 23% 7%	840
	21st to end	Night	13% 6% 21% 35% 22% 3	924
April	1st to 10th	Night	11% 5% 20% 38% 23% 3	840
	11th to 20th	Night	8% 6% 21% 36% 23% 5%	831
	21st to end	Night	5% 4 24% 33% 25% 9%	840
May	1st to 10th	Night	4 3 19% 40% 28% 7%	840
	11th to 20th	Night	3 2 15% 39% 33% 8%	661
	21st to end	Night	3 4 13% 39% 32% 10%	455
June	1st to 10th	Night	2 1 13% 37% 37% 10%	420
	11th to 20th	Night	1 1 15% 37% 37% 9%	420
	21st to end	Night	1 9% 33% 44% 13%	420
July	1st to 10th	Night	1 4 33% 51% 12%	453
	11th to 20th	Night	2 2 23% 53% 20%	612
	21st to end	Night	2 26% 51% 21%	690
August	1st to 10th	Night	1 4 32% 47% 16%	642
	11th to 20th	Night	6% 30% 50% 13%	832
	21st to end	Night	1 4 26% 54% 14%	916
September	1st to 10th	Night	6% 30% 51% 13%	800
	11th to 20th	Night	2 1 8% 38% 41% 11%	800
	21st to end	Night	3 1 10% 28% 43% 15%	800
October	1st to 10th	Night	4 1 13% 36% 36% 10%	800
	11th to 20th	Night	6% 2 12% 33% 36% 12%	800
	21st to end	Night	5% 2 11% 37% 29% 16%	880
November	1st to 10th	Night	6% 5% 14% 34% 30% 11%	820
	11th to 20th	Night	11% 4 13% 35% 29% 8%	840
	21st to end	Night	9% 3 17% 37% 27% 7%	840
December	1st to 10th	Night	15% 4 18% 35% 23% 6%	840
	11th to 20th	Night	18% 5% 17% 33% 23% 4	840
	21st to end	Night	17% 10% 21% 29% 18% 5%	924

Page generated at 2026-08-27 01:07:10. Version ac07

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