Devil`s Sinkhole State Natural Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Devil`s Sinkhole State Natural Area clear sky chart from 2005-11-06 to 2024-01-22.

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	9% 5% 2 5% 4 3 4 4 5% 7% 52%	74924
	Night	8% 5% 2 4 4 2 4 4 5% 7% 56%	75042
Transparency	Day	32% 5% 10% 21% 21% 11%	74653
	Night	28% 5% 11% 21% 21% 14%	74833
Seeing	Day	10% 6% 24% 33% 22% 6%	13691
	Night	10% 6% 31% 38% 14% 1	23798

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	10% 6% 2 4 3 2 3 3 3 7% 57%	1707
	11th to 20th	Day	11% 6% 2 3 3 2 3 4 6% 5% 54%	1809
	21st to end	Day	10% 5% 1 4 4 2 4 4 4 5% 57%	1990
February	1st to 10th	Day	9% 6% 3 5% 4 2 4 4 4 5% 54%	1800
	11th to 20th	Day	11% 6% 2 6% 4 3 3 3 4 5% 52%	1749
	21st to end	Day	9% 6% 2 4 4 1 3 3 5% 7% 57%	1480
March	1st to 10th	Day	12% 7% 3 6% 4 2 5% 4 4 7% 47%	1828
	11th to 20th	Day	12% 6% 2 5% 4 3 4 4 5% 6% 49%	1980
	21st to end	Day	10% 6% 3 4 4 3 2 4 4 7% 53%	2178
April	1st to 10th	Day	8% 6% 3 5% 4 3 4 4 6% 8% 50%	2025
	11th to 20th	Day	11% 6% 3 4 4 2 4 4 4 6% 52%	2134
	21st to end	Day	9% 6% 3 5% 4 2 4 4 3 6% 54%	2160
May	1st to 10th	Day	10% 6% 3 5% 4 3 5% 5% 6% 7% 46%	2326
	11th to 20th	Day	10% 6% 3 6% 6% 3 4 4 5% 8% 45%	2302
	21st to end	Day	10% 6% 3 6% 6% 4 6% 5% 5% 7% 42%	2531
June	1st to 10th	Day	4 3 2 4 4 3 5% 4 6% 9% 56%	2340
	11th to 20th	Day	5% 3 2 4 4 3 5% 5% 6% 9% 54%	2340
	21st to end	Day	6% 4 2 6% 5% 4 6% 6% 6% 8% 46%	2340
July	1st to 10th	Day	9% 5% 3 6% 6% 4 5% 6% 7% 9% 40%	2340
	11th to 20th	Day	5% 3 1 3 4 3 5% 5% 5% 8% 58%	2340
	21st to end	Day	5% 2 2 4 4 3 4 4 8% 10% 54%	2484
August	1st to 10th	Day	1 2 1 3 3 2 4 4 6% 8% 64%	2149
	11th to 20th	Day	6% 4 2 4 6% 4 6% 4 6% 9% 50%	2123
	21st to end	Day	6% 5% 2 5% 6% 4 6% 6% 6% 9% 46%	2376
September	1st to 10th	Day	10% 5% 2 6% 6% 4 5% 5% 7% 7% 42%	2008
	11th to 20th	Day	10% 6% 3 5% 6% 4 6% 5% 6% 8% 41%	1980
	21st to end	Day	9% 4 2 6% 5% 3 4 4 5% 8% 49%	1980
October	1st to 10th	Day	6% 5% 2 4 4 2 5% 5% 6% 7% 55%	1980
	11th to 20th	Day	11% 6% 2 4 4 3 3 4 4 6% 53%	1980
	21st to end	Day	10% 5% 3 4 4 2 3 3 3 5% 61%	1995
November	1st to 10th	Day	10% 7% 2 4 4 2 4 4 4 7% 53%	1744
	11th to 20th	Day	8% 5% 2 4 5% 3 4 4 4 6% 55%	1710
	21st to end	Day	11% 6% 3 5% 4 2 3 3 4 5% 52%	1710
December	1st to 10th	Day	11% 5% 2 5% 4 2 3 4 4 7% 53%	1710
	11th to 20th	Day	10% 8% 2 6% 5% 3 3 3 4 6% 49%	2161
	21st to end	Day	10% 6% 2 3 3 2 3 3 3 5% 60%	3135
January	1st to 10th	Night	10% 5% 2 4 3 2 3 4 4 6% 57%	2458
	11th to 20th	Night	10% 7% 2 4 3 2 3 3 5% 5% 56%	2386
	21st to end	Night	11% 6% 2 4 4 2 3 3 4 6% 53%	2400
February	1st to 10th	Night	8% 6% 3 4 3 2 3 3 5% 7% 55%	2160
	11th to 20th	Night	11% 5% 2 4 4 2 4 4 5% 5% 54%	2098
	21st to end	Night	9% 6% 2 5% 3 3 4 4 5% 6% 53%	1776
March	1st to 10th	Night	9% 6% 2 5% 5% 3 3 4 6% 7% 50%	2130
	11th to 20th	Night	11% 5% 3 5% 4 2 4 4 5% 5% 51%	1980
	21st to end	Night	8% 5% 2 4 4 3 3 3 5% 7% 57%	2178
April	1st to 10th	Night	5% 5% 2 4 5% 2 5% 4 5% 8% 55%	1929
	11th to 20th	Night	9% 6% 2 5% 4 2 4 4 5% 6% 54%	1777
	21st to end	Night	9% 5% 3 3 4 2 3 4 4 7% 57%	1800
May	1st to 10th	Night	8% 4 2 5% 4 3 4 4 6% 7% 53%	1634
	11th to 20th	Night	8% 6% 2 5% 5% 3 4 3 5% 8% 50%	1593
	21st to end	Night	8% 6% 3 5% 3 3 3 5% 5% 10% 49%	1745
June	1st to 10th	Night	2 2 1 2 3 1 2 5% 7% 11% 63%	1620
	11th to 20th	Night	1 2 1 3 4 2 4 6% 5% 11% 61%	1620
	21st to end	Night	4 3 1 4 4 3 3 5% 7% 9% 57%	1620
July	1st to 10th	Night	6% 3 2 5% 4 3 5% 6% 6% 11% 50%	1620
	11th to 20th	Night	2 2 1 2 3 2 4 5% 4 8% 66%	1620
	21st to end	Night	3 1 1 2 2 2 4 4 6% 10% 65%	1830
August	1st to 10th	Night	2 1 1 2 2 1 2 3 4 8% 73%	1790
	11th to 20th	Night	4 3 1 3 4 3 5% 5% 7% 10% 55%	1778
	21st to end	Night	4 4 2 4 5% 3 5% 5% 6% 10% 52%	1980
September	1st to 10th	Night	7% 5% 2 5% 5% 3 4 5% 6% 7% 52%	1952
	11th to 20th	Night	7% 5% 3 5% 6% 3 4 4 5% 9% 49%	1980
	21st to end	Night	7% 3 2 3 4 3 3 5% 5% 8% 55%	1980
October	1st to 10th	Night	5% 4 2 3 3 2 3 3 5% 8% 63%	1980
	11th to 20th	Night	10% 4 2 3 4 2 4 3 4 6% 57%	1980
	21st to end	Night	9% 5% 1 3 3 1 3 3 3 4 64%	2340
November	1st to 10th	Night	9% 6% 2 4 3 2 3 3 5% 5% 59%	2330
	11th to 20th	Night	7% 4 2 3 3 2 3 4 5% 7% 59%	2470
	21st to end	Night	12% 6% 2 5% 3 2 4 4 5% 6% 51%	2470
December	1st to 10th	Night	10% 6% 2 4 3 2 4 3 4 6% 55%	2470
	11th to 20th	Night	9% 8% 3 5% 4 3 4 4 3 6% 51%	3036
	21st to end	Night	11% 7% 2 3 3 1 3 3 4 7% 56%	4532

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	29% 3 5% 18% 26% 19%	1708
	11th to 20th	Day	31% 3 7% 17% 25% 18%	1809
	21st to end	Day	31% 3 7% 12% 28% 18%	1990
February	1st to 10th	Day	33% 3 8% 13% 23% 21%	1800
	11th to 20th	Day	35% 4 7% 17% 21% 17%	1759
	21st to end	Day	28% 4 7% 16% 24% 21%	1480
March	1st to 10th	Day	38% 4 7% 16% 19% 15%	1828
	11th to 20th	Day	36% 4 7% 15% 18% 20%	1980
	21st to end	Day	33% 4 8% 17% 20% 18%	2178
April	1st to 10th	Day	34% 3 9% 18% 20% 16%	2025
	11th to 20th	Day	34% 4 8% 18% 20% 16%	2134
	21st to end	Day	33% 4 8% 20% 21% 14%	2160
May	1st to 10th	Day	36% 5% 11% 16% 22% 10%	2326
	11th to 20th	Day	38% 5% 10% 22% 20% 5%	2306
	21st to end	Day	40% 7% 10% 22% 18% 3	2531
June	1st to 10th	Day	25% 6% 13% 31% 21% 4	2340
	11th to 20th	Day	27% 5% 13% 28% 21% 6%	2340
	21st to end	Day	35% 6% 13% 24% 18% 4	2340
July	1st to 10th	Day	37% 9% 16% 26% 10% 1	2276
	11th to 20th	Day	24% 7% 16% 28% 22% 3	2271
	21st to end	Day	20% 8% 24% 34% 14% 1	2346
August	1st to 10th	Day	18% 5% 14% 41% 21% 2	2136
	11th to 20th	Day	31% 8% 15% 29% 15% 3	2123
	21st to end	Day	34% 8% 14% 27% 14% 3	2376
September	1st to 10th	Day	39% 7% 13% 18% 17% 6%	2008
	11th to 20th	Day	39% 7% 12% 21% 16% 5%	1980
	21st to end	Day	32% 6% 13% 20% 19% 10%	1980
October	1st to 10th	Day	27% 7% 11% 24% 23% 9%	1980
	11th to 20th	Day	33% 5% 8% 15% 21% 17%	1980
	21st to end	Day	29% 3 4 16% 27% 20%	1995
November	1st to 10th	Day	33% 5% 9% 21% 20% 12%	1744
	11th to 20th	Day	30% 5% 7% 19% 22% 17%	1710
	21st to end	Day	35% 3 6% 17% 22% 16%	1710
December	1st to 10th	Day	33% 4 9% 17% 26% 11%	1710
	11th to 20th	Day	37% 4 6% 12% 23% 18%	2159
	21st to end	Day	29% 2 5% 16% 26% 21%	3135
January	1st to 10th	Night	29% 3 6% 14% 26% 21%	2458
	11th to 20th	Night	32% 2 6% 17% 24% 19%	2386
	21st to end	Night	34% 3 6% 14% 23% 21%	2400
February	1st to 10th	Night	30% 4 8% 14% 22% 22%	2160
	11th to 20th	Night	33% 3 7% 17% 22% 18%	2098
	21st to end	Night	31% 5% 6% 14% 22% 21%	1776
March	1st to 10th	Night	33% 4 11% 17% 21% 14%	2130
	11th to 20th	Night	35% 5% 8% 14% 17% 20%	1980
	21st to end	Night	29% 3 12% 19% 19% 18%	2178
April	1st to 10th	Night	30% 5% 10% 20% 17% 18%	1929
	11th to 20th	Night	32% 5% 10% 17% 18% 19%	1777
	21st to end	Night	30% 4 11% 22% 19% 14%	1800
May	1st to 10th	Night	30% 5% 12% 22% 20% 11%	1634
	11th to 20th	Night	33% 6% 12% 26% 18% 6%	1594
	21st to end	Night	32% 7% 15% 27% 16% 3	1746
June	1st to 10th	Night	14% 8% 17% 36% 22% 3	1620
	11th to 20th	Night	18% 6% 16% 30% 22% 7%	1620
	21st to end	Night	23% 6% 19% 27% 19% 5%	1620
July	1st to 10th	Night	28% 9% 23% 27% 11% 1	1575
	11th to 20th	Night	17% 8% 15% 32% 25% 4	1566
	21st to end	Night	12% 7% 26% 39% 15% 1	1728
August	1st to 10th	Night	11% 5% 18% 42% 22% 2	1779
	11th to 20th	Night	22% 8% 21% 29% 16% 3	1778
	21st to end	Night	27% 8% 21% 26% 15% 3	1980
September	1st to 10th	Night	30% 8% 13% 23% 19% 7%	1952
	11th to 20th	Night	32% 8% 16% 23% 18% 4	1980
	21st to end	Night	26% 6% 14% 24% 19% 11%	1980
October	1st to 10th	Night	22% 4 14% 25% 22% 12%	1980
	11th to 20th	Night	29% 3 10% 18% 23% 16%	1980
	21st to end	Night	26% 3 6% 18% 25% 23%	2340
November	1st to 10th	Night	28% 4 8% 20% 26% 14%	2330
	11th to 20th	Night	26% 4 9% 22% 21% 19%	2470
	21st to end	Night	34% 4 8% 15% 22% 17%	2470
December	1st to 10th	Night	31% 4 9% 18% 24% 14%	2470
	11th to 20th	Night	36% 4 5% 16% 18% 22%	3037
	21st to end	Night	29% 4 4 15% 29% 18%	4532

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	13% 13% 39% 26% 9% 1	270
	11th to 20th	Day	16% 9% 36% 29% 9% 1	270
	21st to end	Day	12% 10% 43% 28% 6%	267
February	1st to 10th	Day	18% 13% 34% 22% 13% 1	240
	11th to 20th	Day	21% 12% 40% 20% 5% 1	240
	21st to end	Day	15% 13% 51% 20% 3	198
March	1st to 10th	Day	15% 9% 47% 26% 3	240
	11th to 20th	Day	12% 13% 44% 21% 10%	240
	21st to end	Day	11% 15% 47% 20% 6%	264
April	1st to 10th	Day	10% 12% 45% 29% 4	285
	11th to 20th	Day	11% 14% 42% 26% 6%	412
	21st to end	Day	11% 13% 42% 28% 6%	420
May	1st to 10th	Day	12% 6% 41% 32% 7% 1	589
	11th to 20th	Day	14% 5% 34% 34% 12% 2	625
	21st to end	Day	14% 6% 29% 38% 11% 2	679
June	1st to 10th	Day	5% 3 17% 49% 23% 3	630
	11th to 20th	Day	5% 1 20% 49% 22% 4	630
	21st to end	Day	5% 1 14% 41% 32% 7%	630
July	1st to 10th	Day	8% 1 9% 37% 35% 10%	621
	11th to 20th	Day	3 1 3 38% 48% 6%	618
	21st to end	Day	3 1 4 38% 41% 13%	622
August	1st to 10th	Day	2 2 36% 43% 16%	447
	11th to 20th	Day	8% 2 3 30% 42% 15%	437
	21st to end	Day	6% 2 4 28% 41% 19%	495
September	1st to 10th	Day	9% 2 2 23% 42% 21%	298
	11th to 20th	Day	7% 1 2 24% 44% 22%	270
	21st to end	Day	13% 1 6% 27% 39% 14%	270
October	1st to 10th	Day	6% 2 12% 37% 36% 7%	270
	11th to 20th	Day	13% 3 19% 41% 21% 3	270
	21st to end	Day	16% 10% 25% 30% 17% 2	297
November	1st to 10th	Day	13% 6% 29% 36% 15% 2	270
	11th to 20th	Day	17% 10% 26% 26% 15% 6%	270
	21st to end	Day	16% 14% 36% 24% 7% 3	270
December	1st to 10th	Day	16% 6% 30% 31% 14% 4	270
	11th to 20th	Day	13% 13% 40% 25% 10%	270
	21st to end	Day	16% 10% 34% 30% 10% 1	297
January	1st to 10th	Night	12% 8% 37% 34% 8%	950
	11th to 20th	Night	15% 8% 37% 33% 7%	866
	21st to end	Night	14% 9% 39% 31% 7%	800
February	1st to 10th	Night	13% 12% 40% 29% 6%	720
	11th to 20th	Night	15% 10% 43% 28% 5%	704
	21st to end	Night	14% 13% 49% 23% 1	592
March	1st to 10th	Night	14% 11% 47% 24% 3	690
	11th to 20th	Night	13% 10% 39% 34% 4	540
	21st to end	Night	9% 12% 51% 23% 4	594
April	1st to 10th	Night	6% 8% 53% 29% 4	540
	11th to 20th	Night	11% 12% 52% 24% 2	533
	21st to end	Night	10% 10% 53% 23% 4	540
May	1st to 10th	Night	9% 7% 49% 30% 4	540
	11th to 20th	Night	10% 7% 42% 35% 6% 1	531
	21st to end	Night	9% 6% 38% 39% 8%	584
June	1st to 10th	Night	3 1 24% 59% 12% 1	540
	11th to 20th	Night	2 1 35% 52% 10%	540
	21st to end	Night	5% 1 21% 52% 20% 1	540
July	1st to 10th	Night	6% 2 8% 56% 26% 2	525
	11th to 20th	Night	2 1 8% 61% 28%	522
	21st to end	Night	3 1 7% 59% 29% 2	591
August	1st to 10th	Night	2 4 55% 38% 1	537
	11th to 20th	Night	4 1 3 50% 39% 3	534
	21st to end	Night	4 2 5% 45% 40% 4	594
September	1st to 10th	Night	6% 1 7% 45% 38% 3	540
	11th to 20th	Night	8% 2 6% 46% 35% 2	540
	21st to end	Night	7% 2 13% 46% 29% 2	540
October	1st to 10th	Night	6% 2 17% 50% 24% 1	540
	11th to 20th	Night	11% 4 24% 41% 18% 2	540
	21st to end	Night	12% 7% 28% 34% 18% 2	756
November	1st to 10th	Night	12% 6% 24% 40% 17% 1	850
	11th to 20th	Night	10% 6% 31% 37% 14% 2	950
	21st to end	Night	14% 8% 32% 34% 11% 1	950
December	1st to 10th	Night	13% 6% 29% 41% 9% 1	950
	11th to 20th	Night	16% 8% 35% 34% 7%	950
	21st to end	Night	13% 8% 37% 34% 8%	1045

Page generated at 2024-01-19 08:28:31. Version ac07

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