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 2024-02-25.

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	8% 3 1 3 3 2 3 3 4 6% 64%	78607
	Night	9% 4 2 3 3 2 3 3 4 6% 62%	80716
Transparency	Day	22% 4 9% 22% 25% 18%	78331
	Night	25% 4 8% 19% 25% 20%	80514
Seeing	Day	8% 7% 20% 34% 26% 5%	14562
	Night	8% 3 13% 32% 33% 10%	24168

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	12% 5% 3 5% 4 3 5% 5% 5% 6% 47%	2777
	11th to 20th	Day	16% 7% 3 6% 5% 3 5% 5% 5% 7% 39%	2860
	21st to end	Day	18% 8% 2 6% 5% 3 5% 3 5% 8% 37%	3146
February	1st to 10th	Day	17% 6% 1 4 3 1 4 4 4 5% 49%	1710
	11th to 20th	Day	12% 5% 2 5% 4 3 4 4 6% 8% 48%	1827
	21st to end	Day	13% 6% 2 3 4 3 4 5% 5% 7% 47%	1521
March	1st to 10th	Day	14% 7% 3 5% 6% 3 5% 4 5% 9% 40%	1916
	11th to 20th	Day	15% 6% 2 4 5% 3 6% 4 4 7% 42%	1980
	21st to end	Day	12% 6% 3 4 4 2 4 4 3 6% 53%	2231
April	1st to 10th	Day	11% 5% 2 4 4 2 4 5% 5% 8% 51%	2160
	11th to 20th	Day	8% 3 2 3 4 2 4 4 5% 6% 59%	2129
	21st to end	Day	6% 3 1 2 3 2 3 4 4 7% 64%	2160
May	1st to 10th	Day	4 3 1 2 2 2 3 4 5% 6% 69%	2160
	11th to 20th	Day	4 2 1 1 2 1 2 3 3 8% 72%	2261
	21st to end	Day	3 2 1 2 3 2 3 4 4 6% 69%	2723
June	1st to 10th	Day	2 2 1 2 2 1 3 3 4 7% 73%	2520
	11th to 20th	Day	1 1 1 1 1 1 3 4 5% 82%	2520
	21st to end	Day	1 1 1 1 1 1 1 2 2 4 85%	2520
July	1st to 10th	Day	1 1 1 1 2 3 6% 84%	2477
	11th to 20th	Day	1 1 1 1 1 1 2 2 2 5% 84%	2340
	21st to end	Day	1 1 1 1 1 2 3 4 6% 80%	2546
August	1st to 10th	Day	1 1 1 1 1 1 2 3 4 84%	2313
	11th to 20th	Day	1 2 1 1 2 2 4 86%	2122
	21st to end	Day	1 1 2 1 2 2 3 5% 85%	2376
September	1st to 10th	Day	1 1 1 1 1 2 2 2 4 85%	2160
	11th to 20th	Day	2 1 1 2 1 1 3 2 6% 82%	2160
	21st to end	Day	1 1 1 1 3 1 3 2 3 5% 78%	1936
October	1st to 10th	Day	2 2 1 2 2 1 2 3 5% 5% 74%	1800
	11th to 20th	Day	4 2 1 2 3 2 2 3 3 6% 71%	1800
	21st to end	Day	6% 3 1 2 3 2 3 3 4 6% 67%	1980
November	1st to 10th	Day	8% 4 2 2 3 1 3 3 5% 7% 63%	1839
	11th to 20th	Day	8% 4 2 4 2 2 2 5% 4 6% 63%	1710
	21st to end	Day	11% 3 2 3 3 2 4 4 3 6% 58%	1685
December	1st to 10th	Day	13% 6% 2 5% 3 3 3 5% 6% 6% 48%	1520
	11th to 20th	Day	28% 6% 2 4 4 3 4 4 5% 6% 34%	1928
	21st to end	Day	22% 8% 3 4 4 3 4 4 5% 7% 38%	2794
January	1st to 10th	Night	12% 6% 2 4 4 2 3 3 4 6% 54%	4159
	11th to 20th	Night	16% 9% 3 5% 4 3 4 4 5% 7% 40%	4110
	21st to end	Night	18% 8% 2 6% 5% 3 3 4 5% 7% 39%	4521
February	1st to 10th	Night	16% 6% 2 3 3 2 3 4 3 6% 52%	2470
	11th to 20th	Night	11% 4 1 3 3 2 4 4 5% 8% 54%	2238
	21st to end	Night	12% 7% 3 4 3 2 3 3 5% 6% 53%	1829
March	1st to 10th	Night	14% 7% 3 6% 6% 3 5% 4 6% 5% 42%	2039
	11th to 20th	Night	12% 7% 3 4 3 2 4 4 4 8% 48%	1980
	21st to end	Night	11% 6% 2 5% 3 2 3 3 4 6% 56%	2124
April	1st to 10th	Night	8% 6% 3 4 4 2 4 4 5% 6% 54%	1800
	11th to 20th	Night	7% 3 2 3 4 2 3 3 4 5% 64%	1779
	21st to end	Night	3 4 2 2 2 2 3 4 6% 10% 64%	1800
May	1st to 10th	Night	4 2 1 2 3 2 3 3 5% 6% 69%	1800
	11th to 20th	Night	3 2 2 2 2 2 3 5% 5% 73%	1628
	21st to end	Night	3 2 2 3 2 1 3 3 4 5% 73%	1552
June	1st to 10th	Night	2 2 1 1 1 1 2 3 4 6% 76%	1440
	11th to 20th	Night	1 1 1 2 1 1 2 2 3 5% 81%	1440
	21st to end	Night	1 1 1 1 2 3 4 86%	1440
July	1st to 10th	Night	1 1 1 1 3 4 88%	1478
	11th to 20th	Night	1 1 1 1 1 1 2 3 3 85%	1620
	21st to end	Night	1 1 1 1 2 1 2 2 6% 6% 77%	1773
August	1st to 10th	Night	1 1 1 2 1 1 2 3 3 84%	1623
	11th to 20th	Night	1 1 1 1 2 2 2 3 87%	1780
	21st to end	Night	1 2 1 1 2 3 4 87%	1980
September	1st to 10th	Night	1 1 1 1 1 1 3 4 87%	1800
	11th to 20th	Night	2 2 2 1 1 1 1 3 4 82%	1800
	21st to end	Night	1 1 1 1 1 1 2 2 3 84%	2017
October	1st to 10th	Night	4 2 1 2 2 2 2 3 4 5% 72%	2160
	11th to 20th	Night	3 3 1 2 2 2 3 3 4 5% 72%	2160
	21st to end	Night	4 3 1 3 3 2 3 2 4 5% 71%	2376
November	1st to 10th	Night	6% 4 1 3 3 2 3 3 4 5% 67%	2239
	11th to 20th	Night	7% 4 2 3 3 2 3 3 5% 7% 62%	2470
	21st to end	Night	6% 5% 2 4 3 2 4 4 4 6% 59%	2493
December	1st to 10th	Night	14% 5% 2 3 3 2 3 3 5% 5% 54%	2660
	11th to 20th	Night	27% 7% 2 4 4 2 4 4 4 5% 37%	3276
	21st to end	Night	19% 7% 3 5% 5% 3 4 4 4 6% 41%	4862

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	33% 9% 11% 28% 15% 4	2777
	11th to 20th	Day	42% 6% 11% 18% 13% 9%	2860
	21st to end	Day	45% 6% 8% 19% 14% 7%	3146
February	1st to 10th	Day	36% 5% 8% 16% 20% 14%	1710
	11th to 20th	Day	33% 5% 9% 20% 21% 10%	1837
	21st to end	Day	36% 7% 10% 19% 21% 8%	1521
March	1st to 10th	Day	42% 6% 8% 19% 18% 7%	1916
	11th to 20th	Day	41% 5% 10% 18% 18% 8%	1980
	21st to end	Day	34% 5% 12% 23% 20% 6%	2231
April	1st to 10th	Day	32% 6% 12% 22% 20% 8%	2160
	11th to 20th	Day	24% 6% 12% 27% 23% 8%	2132
	21st to end	Day	19% 6% 12% 30% 26% 6%	2160
May	1st to 10th	Day	16% 5% 12% 26% 30% 11%	2160
	11th to 20th	Day	13% 3 10% 32% 30% 12%	2264
	21st to end	Day	15% 4 17% 32% 24% 7%	2724
June	1st to 10th	Day	13% 5% 12% 26% 32% 13%	2520
	11th to 20th	Day	6% 2 10% 25% 33% 24%	2520
	21st to end	Day	6% 2 4 19% 34% 35%	2520
July	1st to 10th	Day	4 2 5% 15% 37% 38%	2410
	11th to 20th	Day	7% 2 5% 21% 33% 32%	2271
	21st to end	Day	6% 2 8% 22% 31% 30%	2405
August	1st to 10th	Day	7% 2 4 19% 35% 34%	2297
	11th to 20th	Day	5% 1 4 25% 30% 34%	2122
	21st to end	Day	5% 1 4 23% 37% 30%	2376
September	1st to 10th	Day	5% 2 4 17% 33% 40%	2160
	11th to 20th	Day	7% 2 7% 22% 38% 23%	2160
	21st to end	Day	10% 1 7% 22% 37% 23%	1936
October	1st to 10th	Day	13% 4 8% 23% 24% 29%	1800
	11th to 20th	Day	16% 4 8% 25% 23% 25%	1800
	21st to end	Day	19% 2 7% 21% 26% 25%	1980
November	1st to 10th	Day	22% 5% 8% 21% 26% 17%	1839
	11th to 20th	Day	23% 4 11% 19% 25% 17%	1710
	21st to end	Day	29% 2 9% 18% 24% 18%	1685
December	1st to 10th	Day	35% 6% 8% 18% 20% 14%	1520
	11th to 20th	Day	50% 5% 9% 15% 13% 8%	1928
	21st to end	Day	44% 7% 9% 20% 15% 5%	2794
January	1st to 10th	Night	30% 6% 14% 27% 18% 5%	4159
	11th to 20th	Night	42% 6% 10% 20% 13% 9%	4110
	21st to end	Night	44% 5% 10% 15% 17% 9%	4521
February	1st to 10th	Night	35% 4 8% 16% 21% 16%	2470
	11th to 20th	Night	28% 5% 11% 20% 25% 11%	2239
	21st to end	Night	32% 5% 9% 24% 21% 9%	1829
March	1st to 10th	Night	41% 6% 12% 17% 17% 7%	2039
	11th to 20th	Night	35% 6% 9% 17% 22% 11%	1980
	21st to end	Night	30% 5% 12% 22% 22% 9%	2124
April	1st to 10th	Night	31% 4 12% 20% 21% 11%	1800
	11th to 20th	Night	24% 4 10% 27% 25% 12%	1779
	21st to end	Night	16% 5% 11% 30% 28% 10%	1800
May	1st to 10th	Night	16% 4 9% 23% 31% 18%	1800
	11th to 20th	Night	14% 3 8% 24% 34% 16%	1629
	21st to end	Night	13% 3 14% 26% 30% 13%	1552
June	1st to 10th	Night	10% 4 13% 19% 33% 21%	1440
	11th to 20th	Night	9% 2 6% 19% 30% 34%	1440
	21st to end	Night	4 1 3 14% 31% 47%	1440
July	1st to 10th	Night	3 1 3 11% 32% 51%	1436
	11th to 20th	Night	6% 1 3 17% 33% 40%	1566
	21st to end	Night	8% 2 4 19% 29% 38%	1674
August	1st to 10th	Night	8% 1 3 11% 34% 43%	1614
	11th to 20th	Night	5% 1 3 16% 30% 45%	1780
	21st to end	Night	5% 1 3 14% 37% 41%	1980
September	1st to 10th	Night	5% 2 3 9% 28% 53%	1800
	11th to 20th	Night	8% 2 3 17% 34% 36%	1800
	21st to end	Night	8% 1 5% 19% 38% 29%	2017
October	1st to 10th	Night	15% 2 7% 21% 23% 32%	2160
	11th to 20th	Night	15% 3 6% 19% 31% 25%	2160
	21st to end	Night	17% 3 6% 18% 29% 28%	2376
November	1st to 10th	Night	21% 3 8% 20% 27% 20%	2239
	11th to 20th	Night	23% 4 10% 18% 26% 19%	2470
	21st to end	Night	26% 5% 9% 16% 25% 20%	2493
December	1st to 10th	Night	33% 4 8% 18% 20% 17%	2660
	11th to 20th	Night	49% 6% 9% 14% 15% 8%	3276
	21st to end	Night	44% 6% 10% 16% 17% 6%	4862

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% 23% 21% 13% 4	327
	11th to 20th	Day	16% 7% 23% 30% 19% 5%	370
	21st to end	Day	15% 10% 24% 29% 19% 4	407
February	1st to 10th	Day	21% 12% 19% 21% 21% 6%	370
	11th to 20th	Day	14% 14% 27% 27% 16% 2	444
	21st to end	Day	13% 13% 26% 30% 17% 1	363
March	1st to 10th	Day	21% 11% 28% 29% 10% 1	420
	11th to 20th	Day	21% 10% 25% 25% 17% 2	420
	21st to end	Day	15% 12% 32% 31% 10%	462
April	1st to 10th	Day	15% 9% 29% 30% 15% 1	420
	11th to 20th	Day	9% 14% 30% 31% 14% 2	412
	21st to end	Day	5% 10% 31% 32% 17% 5%	420
May	1st to 10th	Day	8% 9% 29% 30% 20% 3	423
	11th to 20th	Day	7% 7% 26% 35% 20% 4	448
	21st to end	Day	5% 9% 21% 36% 22% 6%	485
June	1st to 10th	Day	3 4 21% 39% 24% 8%	450
	11th to 20th	Day	1 5% 20% 44% 26% 5%	450
	21st to end	Day	1 1 16% 43% 30% 8%	450
July	1st to 10th	Day	1 14% 39% 40% 6%	446
	11th to 20th	Day	2 5% 39% 44% 11%	444
	21st to end	Day	1 7% 39% 42% 10%	487
August	1st to 10th	Day	3 1 13% 46% 29% 8%	447
	11th to 20th	Day	1 1 10% 43% 36% 9%	437
	21st to end	Day	1 9% 42% 41% 8%	495
September	1st to 10th	Day	1 3 11% 40% 38% 7%	450
	11th to 20th	Day	2 3 17% 38% 35% 5%	450
	21st to end	Day	3 5% 11% 37% 37% 6%	450
October	1st to 10th	Day	3 5% 21% 34% 32% 5%	450
	11th to 20th	Day	5% 4 19% 32% 32% 8%	450
	21st to end	Day	6% 5% 19% 33% 30% 7%	495
November	1st to 10th	Day	8% 8% 17% 28% 34% 6%	435
	11th to 20th	Day	8% 6% 19% 33% 27% 8%	270
	21st to end	Day	10% 5% 25% 30% 25% 5%	257
December	1st to 10th	Day	17% 9% 23% 29% 19% 3	180
	11th to 20th	Day	14% 14% 19% 27% 19% 7%	180
	21st to end	Day	15% 15% 24% 27% 14% 5%	198
January	1st to 10th	Night	17% 4 15% 32% 22% 9%	760
	11th to 20th	Night	14% 4 13% 32% 28% 8%	760
	21st to end	Night	17% 3 14% 35% 26% 5%	836
February	1st to 10th	Night	19% 6% 13% 30% 25% 7%	760
	11th to 20th	Night	12% 7% 18% 33% 23% 7%	744
	21st to end	Night	14% 8% 18% 35% 23% 3	610
March	1st to 10th	Night	18% 5% 18% 33% 21% 5%	720
	11th to 20th	Night	14% 6% 16% 31% 26% 8%	720
	21st to end	Night	13% 5% 19% 34% 24% 4	792
April	1st to 10th	Night	12% 3 19% 38% 25% 4	720
	11th to 20th	Night	7% 7% 22% 35% 23% 6%	711
	21st to end	Night	4 4 23% 33% 25% 10%	720
May	1st to 10th	Night	4 3 18% 39% 28% 8%	720
	11th to 20th	Night	4 1 13% 38% 35% 9%	566
	21st to end	Night	3 4 14% 36% 33% 10%	389
June	1st to 10th	Night	3 2 13% 35% 38% 11%	360
	11th to 20th	Night	1 1 13% 36% 39% 11%	360
	21st to end	Night	1 8% 32% 45% 15%	360
July	1st to 10th	Night	1 3 29% 53% 14%	386
	11th to 20th	Night	2 1 19% 55% 22%	522
	21st to end	Night	1 1 1 22% 52% 24%	591
August	1st to 10th	Night	1 3 32% 47% 17%	549
	11th to 20th	Night	4 29% 51% 15%	712
	21st to end	Night	1 3 22% 59% 16%	792
September	1st to 10th	Night	5% 25% 56% 14%	720
	11th to 20th	Night	2 1 7% 34% 44% 12%	720
	21st to end	Night	3 1 8% 26% 46% 16%	720
October	1st to 10th	Night	4 1 12% 34% 38% 11%	720
	11th to 20th	Night	6% 2 9% 33% 37% 13%	720
	21st to end	Night	5% 2 9% 35% 32% 18%	792
November	1st to 10th	Night	6% 4 13% 32% 32% 12%	740
	11th to 20th	Night	9% 3 11% 36% 32% 9%	760
	21st to end	Night	8% 3 15% 36% 30% 8%	760
December	1st to 10th	Night	16% 3 14% 35% 24% 7%	760
	11th to 20th	Night	20% 4 16% 31% 24% 5%	760
	21st to end	Night	15% 10% 19% 31% 20% 5%	836

Page generated at 2024-02-22 03:05:42. Version ac07

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