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 2025-04-26.

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	7% 3 1 3 2 2 3 3 4 6% 65%	117539
	Night	8% 4 1 3 2 2 3 3 5% 5% 63%	119979
Transparency	Day	12% 41% 5% 12% 14% 16%	117300
	Night	15% 40% 4 10% 14% 17%	119808
Seeing	Day	8% 7% 21% 34% 25% 5%	16136
	Night	8% 4 14% 32% 32% 9%	25734

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	9% 4 2 5% 3 3 4 4 5% 6% 56%	3989
	11th to 20th	Day	11% 5% 2 5% 3 3 3 3 4 6% 56%	4100
	21st to end	Day	13% 7% 2 7% 4 4 4 3 6% 7% 43%	4510
February	1st to 10th	Day	18% 6% 2 4 3 3 3 4 4 5% 49%	1800
	11th to 20th	Day	12% 6% 2 5% 4 4 4 3 6% 8% 48%	1926
	21st to end	Day	12% 8% 2 3 4 4 4 4 5% 7% 47%	1650
March	1st to 10th	Day	13% 8% 3 7% 5% 5% 4 4 7% 7% 37%	4815
	11th to 20th	Day	12% 5% 2 5% 3 3 3 3 4 6% 53%	5000
	21st to end	Day	12% 7% 2 5% 4 4 5% 5% 6% 9% 40%	5616
April	1st to 10th	Day	10% 5% 2 4 4 3 3 4 5% 7% 53%	2400
	11th to 20th	Day	7% 4 1 3 3 3 4 3 6% 6% 57%	2369
	21st to end	Day	5% 4 1 3 2 3 3 4 5% 8% 62%	2342
May	1st to 10th	Day	5% 3 1 2 1 2 2 2 3 4 77%	3800
	11th to 20th	Day	2 1 1 1 1 3 4 4 9% 74%	4005
	21st to end	Day	2 2 1 2 2 2 3 3 3 5% 76%	4813
June	1st to 10th	Day	2 2 1 2 2 2 3 3 5% 7% 72%	2660
	11th to 20th	Day	1 1 1 1 1 1 3 4 5% 81%	2660
	21st to end	Day	1 1 1 1 1 1 1 2 2 4 85%	2660
July	1st to 10th	Day	1 1 1 2 3 91%	4338
	11th to 20th	Day	1 1 1 1 1 2 1 7% 6% 79%	4110
	21st to end	Day	1 1 1 1 1 2 6% 5% 82%	4455
August	1st to 10th	Day	1 1 2 1 1 3 3 4 4 81%	4063
	11th to 20th	Day	1 1 1 1 1 2 3 90%	3724
	21st to end	Day	1 1 1 1 1 1 2 4 88%	4180
September	1st to 10th	Day	1 1 1 1 2 2 3 4 85%	2280
	11th to 20th	Day	2 1 1 2 1 1 2 2 6% 81%	2280
	21st to end	Day	1 2 1 2 2 1 3 2 3 5% 79%	2043
October	1st to 10th	Day	1 1 1 2 2 2 3 2 5% 4 77%	3180
	11th to 20th	Day	2 2 1 2 2 2 2 2 2 4 79%	3161
	21st to end	Day	4 4 1 4 3 2 3 3 4 6% 66%	3448
November	1st to 10th	Day	7% 5% 1 3 2 2 3 2 5% 7% 64%	1937
	11th to 20th	Day	7% 4 2 4 2 2 3 4 4 6% 62%	1800
	21st to end	Day	11% 4 1 4 3 4 3 3 4 6% 56%	1773
December	1st to 10th	Day	9% 5% 2 5% 2 4 3 3 6% 7% 54%	2620
	11th to 20th	Day	22% 6% 2 4 3 3 3 3 5% 7% 42%	3028
	21st to end	Day	21% 8% 2 5% 4 4 4 4 7% 7% 34%	4004
January	1st to 10th	Night	9% 6% 2 4 2 3 3 2 4 8% 59%	5955
	11th to 20th	Night	11% 6% 2 4 2 3 3 3 5% 5% 56%	5880
	21st to end	Night	13% 7% 2 6% 4 3 3 3 5% 7% 46%	6468
February	1st to 10th	Night	16% 6% 2 4 4 3 3 3 4 5% 51%	2600
	11th to 20th	Night	12% 5% 1 4 3 3 4 3 5% 8% 53%	2359
	21st to end	Night	11% 7% 2 4 3 3 3 3 4 6% 53%	1980
March	1st to 10th	Night	16% 9% 2 7% 5% 4 4 3 6% 6% 37%	5074
	11th to 20th	Night	12% 7% 2 4 2 3 3 3 4 6% 55%	5000
	21st to end	Night	15% 11% 2 5% 3 3 3 3 5% 7% 45%	5358
April	1st to 10th	Night	7% 6% 2 4 4 3 3 3 5% 6% 56%	2000
	11th to 20th	Night	7% 4 2 4 4 3 3 3 4 5% 62%	1979
	21st to end	Night	3 4 1 3 2 2 3 3 6% 9% 64%	1954
May	1st to 10th	Night	2 1 2 2 2 2 2 4 4 80%	3180
	11th to 20th	Night	2 1 2 1 2 3 6% 9% 6% 69%	2882
	21st to end	Night	2 2 1 2 1 1 2 2 5% 4 80%	2762
June	1st to 10th	Night	2 2 1 1 1 1 2 2 5% 6% 76%	1520
	11th to 20th	Night	1 1 1 2 1 1 2 1 4 5% 81%	1520
	21st to end	Night	1 1 1 1 1 2 3 4 86%	1520
July	1st to 10th	Night	1 1 1 2 2 93%	2620
	11th to 20th	Night	1 1 1 2 1 1 6% 4 83%	2860
	21st to end	Night	1 1 1 1 2 11% 5% 77%	3109
August	1st to 10th	Night	1 1 2 1 1 1 2 3 4 83%	2874
	11th to 20th	Night	1 1 1 1 1 1 2 2 92%	3126
	21st to end	Night	1 1 1 1 1 1 1 3 3 88%	3498
September	1st to 10th	Night	1 1 1 1 1 1 3 3 87%	1900
	11th to 20th	Night	2 2 2 1 1 1 1 3 5% 81%	1900
	21st to end	Night	1 1 2 1 1 2 1 3 3 84%	2130
October	1st to 10th	Night	2 2 1 2 1 2 2 2 4 5% 77%	3800
	11th to 20th	Night	2 2 1 2 2 2 2 2 3 4 78%	3777
	21st to end	Night	4 4 1 2 2 2 3 2 4 5% 72%	4121
November	1st to 10th	Night	6% 4 1 3 3 2 2 3 4 5% 67%	2360
	11th to 20th	Night	7% 4 2 4 2 3 3 3 5% 7% 62%	2600
	21st to end	Night	8% 5% 2 5% 3 3 4 3 5% 6% 57%	2625
December	1st to 10th	Night	9% 4 2 4 3 3 3 3 5% 5% 59%	4560
	11th to 20th	Night	20% 7% 2 5% 4 3 4 4 7% 6% 39%	5176
	21st to end	Night	18% 8% 3 7% 5% 4 5% 4 5% 6% 36%	6952

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	17% 30% 10% 21% 15% 7%	3989
	11th to 20th	Day	23% 28% 6% 8% 12% 23%	4100
	21st to end	Day	29% 29% 4 11% 14% 13%	4510
February	1st to 10th	Day	19% 63% 4 4 7% 5%	1800
	11th to 20th	Day	15% 61% 4 9% 7% 4	1936
	21st to end	Day	12% 63% 5% 9% 8% 3	1650
March	1st to 10th	Day	30% 33% 8% 7% 18% 4	4815
	11th to 20th	Day	22% 30% 7% 22% 12% 8%	5000
	21st to end	Day	24% 34% 10% 20% 11% 1	5616
April	1st to 10th	Day	13% 62% 3 12% 7% 3	2400
	11th to 20th	Day	8% 63% 5% 12% 10% 3	2372
	21st to end	Day	5% 64% 7% 10% 10% 3	2342
May	1st to 10th	Day	8% 39% 5% 16% 18% 13%	3800
	11th to 20th	Day	4 39% 14% 25% 13% 6%	4008
	21st to end	Day	3 39% 7% 19% 26% 6%	4814
June	1st to 10th	Day	4 64% 5% 11% 12% 5%	2660
	11th to 20th	Day	2 64% 3 11% 13% 8%	2660
	21st to end	Day	3 62% 2 6% 10% 17%	2660
July	1st to 10th	Day	1 34% 2 5% 8% 49%	4271
	11th to 20th	Day	4 35% 2 7% 6% 46%	4041
	21st to end	Day	2 34% 3 6% 20% 36%	4315
August	1st to 10th	Day	8% 35% 1 7% 17% 31%	4048
	11th to 20th	Day	1 35% 2 9% 18% 35%	3760
	21st to end	Day	2 35% 2 12% 20% 28%	4179
September	1st to 10th	Day	2 59% 3 9% 12% 15%	2280
	11th to 20th	Day	5% 59% 5% 9% 11% 11%	2280
	21st to end	Day	5% 58% 3 8% 16% 11%	2043
October	1st to 10th	Day	6% 36% 2 4 13% 38%	3180
	11th to 20th	Day	7% 36% 3 13% 25% 16%	3161
	21st to end	Day	13% 35% 2 9% 27% 13%	3448
November	1st to 10th	Day	6% 55% 3 10% 15% 12%	1937
	11th to 20th	Day	13% 57% 5% 8% 11% 6%	1800
	21st to end	Day	15% 57% 5% 8% 10% 6%	1773
December	1st to 10th	Day	19% 36% 3 9% 20% 13%	2620
	11th to 20th	Day	30% 31% 6% 9% 12% 11%	3028
	21st to end	Day	33% 29% 8% 15% 9% 5%	4004
January	1st to 10th	Night	17% 27% 9% 21% 17% 8%	5955
	11th to 20th	Night	23% 28% 5% 10% 12% 22%	5880
	21st to end	Night	28% 29% 4 8% 13% 18%	6468
February	1st to 10th	Night	19% 62% 3 4 7% 5%	2600
	11th to 20th	Night	12% 61% 3 8% 11% 4	2360
	21st to end	Night	10% 62% 4 10% 9% 5%	1980
March	1st to 10th	Night	35% 31% 5% 8% 15% 6%	5074
	11th to 20th	Night	22% 29% 6% 20% 13% 10%	5000
	21st to end	Night	29% 31% 7% 17% 15% 2	5358
April	1st to 10th	Night	13% 62% 3 10% 9% 3	2000
	11th to 20th	Night	10% 62% 4 10% 11% 3	1979
	21st to end	Night	5% 63% 6% 12% 9% 5%	1954
May	1st to 10th	Night	4 39% 6% 16% 17% 17%	3180
	11th to 20th	Night	5% 39% 10% 20% 13% 13%	2883
	21st to end	Night	3 38% 6% 14% 24% 15%	2762
June	1st to 10th	Night	3 64% 3 8% 14% 7%	1520
	11th to 20th	Night	3 63% 3 10% 12% 10%	1520
	21st to end	Night	1 62% 1 4 9% 23%	1520
July	1st to 10th	Night	1 33% 1 4 8% 52%	2578
	11th to 20th	Night	3 34% 1 6% 6% 49%	2806
	21st to end	Night	3 34% 2 5% 19% 39%	3011
August	1st to 10th	Night	6% 35% 1 4 13% 40%	2865
	11th to 20th	Night	1 35% 1 6% 10% 47%	3156
	21st to end	Night	3 35% 2 8% 18% 34%	3498
September	1st to 10th	Night	2 59% 1 6% 11% 20%	1900
	11th to 20th	Night	4 59% 2 9% 12% 14%	1900
	21st to end	Night	4 58% 2 8% 15% 13%	2130
October	1st to 10th	Night	6% 35% 2 4 10% 43%	3800
	11th to 20th	Night	7% 36% 3 9% 28% 18%	3777
	21st to end	Night	11% 35% 2 7% 26% 19%	4121
November	1st to 10th	Night	7% 55% 2 10% 16% 12%	2360
	11th to 20th	Night	13% 57% 3 8% 13% 6%	2600
	21st to end	Night	15% 58% 5% 6% 10% 6%	2625
December	1st to 10th	Night	17% 35% 4 10% 19% 15%	4560
	11th to 20th	Night	32% 32% 6% 7% 13% 10%	5176
	21st to end	Night	37% 28% 5% 14% 12% 3	6952

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% 10% 24% 22% 13% 3	355
	11th to 20th	Day	15% 8% 25% 29% 19% 4	400
	21st to end	Day	14% 10% 25% 28% 19% 4	440
February	1st to 10th	Day	22% 14% 19% 20% 20% 6%	400
	11th to 20th	Day	16% 14% 28% 25% 15% 1	483
	21st to end	Day	12% 14% 28% 30% 16% 1	414
March	1st to 10th	Day	21% 13% 27% 29% 9% 1	500
	11th to 20th	Day	21% 11% 27% 24% 15% 2	500
	21st to end	Day	16% 12% 32% 31% 9%	550
April	1st to 10th	Day	15% 10% 30% 29% 15% 2	500
	11th to 20th	Day	10% 13% 29% 30% 15% 2	492
	21st to end	Day	5% 10% 31% 32% 17% 5%	481
May	1st to 10th	Day	8% 10% 29% 32% 19% 3	463
	11th to 20th	Day	7% 6% 25% 35% 22% 5%	488
	21st to end	Day	5% 9% 20% 36% 24% 6%	529
June	1st to 10th	Day	3 4 21% 40% 24% 8%	490
	11th to 20th	Day	1 5% 23% 42% 25% 4	490
	21st to end	Day	1 1 15% 45% 30% 8%	490
July	1st to 10th	Day	1 13% 41% 39% 6%	486
	11th to 20th	Day	2 6% 39% 43% 11%	484
	21st to end	Day	1 9% 40% 40% 10%	531
August	1st to 10th	Day	3 1 13% 47% 29% 8%	487
	11th to 20th	Day	1 1 13% 43% 34% 8%	477
	21st to end	Day	1 1 9% 41% 39% 8%	539
September	1st to 10th	Day	1 3 12% 41% 37% 7%	490
	11th to 20th	Day	3 3 18% 38% 33% 5%	490
	21st to end	Day	3 5% 13% 37% 36% 6%	490
October	1st to 10th	Day	3 5% 20% 35% 32% 5%	490
	11th to 20th	Day	5% 4 19% 33% 32% 7%	490
	21st to end	Day	6% 5% 20% 34% 29% 6%	539
November	1st to 10th	Day	7% 9% 19% 28% 32% 5%	473
	11th to 20th	Day	10% 7% 20% 32% 24% 7%	300
	21st to end	Day	12% 6% 26% 28% 23% 5%	285
December	1st to 10th	Day	17% 9% 23% 29% 19% 5%	200
	11th to 20th	Day	15% 13% 22% 26% 19% 7%	200
	21st to end	Day	15% 16% 26% 25% 13% 4	220
January	1st to 10th	Night	17% 5% 17% 31% 21% 9%	800
	11th to 20th	Night	14% 5% 15% 32% 27% 8%	800
	21st to end	Night	16% 3 15% 35% 26% 5%	880
February	1st to 10th	Night	19% 7% 14% 30% 24% 7%	800
	11th to 20th	Night	13% 7% 19% 32% 22% 7%	784
	21st to end	Night	13% 8% 20% 35% 22% 3	660
March	1st to 10th	Night	18% 7% 19% 32% 20% 4	800
	11th to 20th	Night	15% 6% 17% 31% 24% 7%	800
	21st to end	Night	13% 6% 21% 34% 22% 4	880
April	1st to 10th	Night	11% 5% 20% 37% 24% 4	800
	11th to 20th	Night	8% 7% 21% 35% 24% 6%	791
	21st to end	Night	4 4 23% 33% 25% 9%	782
May	1st to 10th	Night	4 3 19% 39% 27% 7%	760
	11th to 20th	Night	4 1 12% 39% 36% 8%	597
	21st to end	Night	3 4 13% 36% 33% 10%	411
June	1st to 10th	Night	3 2 13% 36% 37% 10%	380
	11th to 20th	Night	1 1 14% 37% 37% 10%	380
	21st to end	Night	1 8% 32% 44% 14%	380
July	1st to 10th	Night	1 3 30% 53% 13%	409
	11th to 20th	Night	2 2 21% 54% 21%	552
	21st to end	Night	2 23% 52% 22%	624
August	1st to 10th	Night	1 4 32% 46% 17%	580
	11th to 20th	Night	6% 31% 49% 14%	752
	21st to end	Night	1 4 23% 57% 15%	836
September	1st to 10th	Night	6% 28% 53% 13%	760
	11th to 20th	Night	2 1 8% 35% 42% 12%	760
	21st to end	Night	3 1 9% 28% 45% 15%	760
October	1st to 10th	Night	4 1 13% 35% 37% 10%	760
	11th to 20th	Night	6% 2 10% 33% 37% 12%	760
	21st to end	Night	5% 2 10% 35% 30% 17%	836
November	1st to 10th	Night	6% 5% 14% 33% 31% 12%	780
	11th to 20th	Night	9% 4 13% 35% 30% 8%	800
	21st to end	Night	10% 3 16% 35% 29% 8%	800
December	1st to 10th	Night	16% 4 16% 34% 24% 6%	800
	11th to 20th	Night	19% 5% 17% 31% 23% 5%	800
	21st to end	Night	15% 10% 21% 30% 19% 5%	880

Page generated at 2025-04-23 06:25:01. Version ac07

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