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 2025-01-22.

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	8% 6% 2 5% 4 4 4 3 5% 7% 52%	105171
	Night	8% 6% 2 5% 3 3 3 3 5% 7% 56%	104355
Transparency	Day	31% 5% 10% 21% 21% 12%	109082
	Night	27% 5% 11% 21% 21% 15%	108571
Seeing	Day	10% 6% 24% 33% 22% 6%	15024
	Night	10% 6% 31% 38% 14% 1	25103

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	9% 4 2 5% 3 3 3 2 4 6% 61%	2937
	11th to 20th	Day	7% 6% 2 4 2 2 3 3 6% 5% 61%	3110
	21st to end	Day	10% 6% 2 5% 4 4 4 3 5% 7% 51%	3497
February	1st to 10th	Day	9% 7% 3 6% 4 3 3 3 4 5% 53%	1900
	11th to 20th	Day	10% 7% 2 6% 4 4 3 3 4 5% 53%	1849
	21st to end	Day	9% 6% 1 4 3 3 2 3 5% 7% 56%	1570
March	1st to 10th	Day	11% 8% 3 6% 4 3 4 3 4 5% 48%	3184
	11th to 20th	Day	14% 11% 3 8% 4 3 4 3 4 6% 39%	3480
	21st to end	Day	7% 6% 2 5% 4 4 4 3 6% 7% 51%	3814
April	1st to 10th	Day	8% 7% 3 5% 4 4 4 3 6% 7% 51%	2138
	11th to 20th	Day	11% 6% 2 5% 3 3 4 3 4 6% 51%	2254
	21st to end	Day	9% 7% 3 5% 4 3 3 3 4 6% 53%	2280
May	1st to 10th	Day	12% 8% 3 6% 4 4 4 4 5% 7% 44%	4068
	11th to 20th	Day	11% 6% 2 6% 4 4 4 3 4 6% 49%	4082
	21st to end	Day	8% 6% 2 6% 5% 5% 5% 4 6% 8% 47%	4477
June	1st to 10th	Day	4 4 1 5% 4 4 5% 3 6% 9% 55%	2470
	11th to 20th	Day	5% 4 2 5% 3 3 5% 3 6% 8% 53%	2470
	21st to end	Day	6% 5% 2 6% 5% 5% 5% 4 6% 8% 47%	2470
July	1st to 10th	Day	6% 4 2 5% 4 4 4 4 7% 9% 50%	4120
	11th to 20th	Day	3 3 1 4 4 5% 5% 4 6% 10% 55%	4120
	21st to end	Day	7% 4 2 5% 4 4 5% 4 7% 9% 47%	4350
August	1st to 10th	Day	1 2 1 3 3 3 3 3 5% 7% 69%	3785
	11th to 20th	Day	4 2 1 3 3 3 3 3 5% 9% 64%	3726
	21st to end	Day	4 4 1 6% 5% 6% 6% 4 7% 9% 48%	4180
September	1st to 10th	Day	10% 6% 2 6% 5% 5% 5% 4 7% 7% 43%	2119
	11th to 20th	Day	10% 5% 2 6% 5% 5% 5% 4 6% 8% 42%	2090
	21st to end	Day	9% 4 2 7% 4 4 4 3 5% 8% 50%	2090
October	1st to 10th	Day	6% 5% 1 4 3 4 5% 3 6% 7% 57%	2090
	11th to 20th	Day	10% 6% 2 5% 3 3 3 3 4 6% 54%	2090
	21st to end	Day	9% 5% 2 4 3 3 3 2 3 5% 61%	2105
November	1st to 10th	Day	11% 7% 2 5% 3 3 4 3 4 6% 52%	1837
	11th to 20th	Day	8% 5% 2 4 4 4 3 3 4 6% 57%	1800
	21st to end	Day	10% 7% 3 6% 3 3 3 3 5% 6% 53%	1800
December	1st to 10th	Day	19% 8% 3 7% 3 3 3 3 4 5% 43%	2940
	11th to 20th	Day	10% 8% 2 7% 4 5% 4 3 5% 6% 47%	3391
	21st to end	Day	8% 6% 2 4 3 2 2 2 3 4 64%	4488
January	1st to 10th	Night	7% 5% 2 6% 3 3 3 3 3 7% 58%	4238
	11th to 20th	Night	7% 5% 1 3 2 2 2 2 4 4 69%	4109
	21st to end	Night	13% 7% 2 5% 3 3 3 3 4 7% 49%	4192
February	1st to 10th	Night	9% 7% 3 5% 2 3 3 3 5% 6% 55%	2280
	11th to 20th	Night	11% 6% 2 5% 4 3 3 3 4 5% 54%	2218
	21st to end	Night	9% 6% 2 5% 3 4 4 3 5% 6% 53%	1884
March	1st to 10th	Night	7% 7% 2 5% 4 4 3 3 6% 7% 52%	3676
	11th to 20th	Night	12% 11% 3 8% 4 4 3 3 4 5% 43%	3480
	21st to end	Night	8% 9% 2 6% 3 3 3 3 4 6% 54%	3817
April	1st to 10th	Night	5% 6% 2 5% 4 4 4 4 5% 7% 54%	2036
	11th to 20th	Night	9% 6% 2 6% 3 4 4 4 4 6% 52%	1877
	21st to end	Night	9% 6% 2 4 3 3 3 3 4 6% 55%	1900
May	1st to 10th	Night	14% 9% 3 6% 3 3 3 3 5% 7% 45%	2837
	11th to 20th	Night	7% 6% 2 5% 3 4 3 3 5% 7% 56%	2823
	21st to end	Night	7% 5% 2 5% 3 3 3 3 6% 9% 53%	3090
June	1st to 10th	Night	2 2 1 3 2 2 3 4 7% 12% 62%	1710
	11th to 20th	Night	2 2 1 4 3 3 5% 5% 6% 10% 60%	1710
	21st to end	Night	4 4 1 4 4 3 3 5% 6% 9% 56%	1710
July	1st to 10th	Night	3 3 1 4 3 3 4 4 6% 10% 59%	2850
	11th to 20th	Night	2 2 1 4 3 3 4 4 5% 9% 64%	2850
	21st to end	Night	7% 4 2 5% 4 4 4 4 6% 8% 53%	3209
August	1st to 10th	Night	1 1 2 2 2 3 3 5% 7% 74%	3155
	11th to 20th	Night	2 2 1 3 2 3 4 3 6% 10% 65%	3113
	21st to end	Night	4 4 1 5% 4 3 4 4 6% 11% 55%	3487
September	1st to 10th	Night	7% 6% 2 5% 4 4 3 4 6% 7% 52%	2061
	11th to 20th	Night	7% 5% 3 7% 4 4 4 3 5% 8% 50%	2090
	21st to end	Night	7% 4 2 4 3 4 3 4 6% 8% 56%	2090
October	1st to 10th	Night	5% 4 1 3 3 3 3 2 5% 7% 64%	2090
	11th to 20th	Night	10% 4 2 5% 3 3 3 3 4 6% 58%	2090
	21st to end	Night	9% 5% 1 4 2 2 3 2 3 4 65%	2471
November	1st to 10th	Night	9% 6% 2 4 2 3 3 2 4 5% 58%	2456
	11th to 20th	Night	7% 5% 2 4 3 3 3 3 5% 7% 60%	2600
	21st to end	Night	11% 6% 2 5% 3 3 4 3 5% 6% 52%	2600
December	1st to 10th	Night	20% 8% 2 5% 3 4 4 3 4 5% 42%	4250
	11th to 20th	Night	11% 8% 2 5% 3 3 3 2 3 5% 53%	4816
	21st to end	Night	8% 7% 2 4 2 2 3 2 4 6% 61%	6490

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	25% 3 6% 16% 25% 26%	2938
	11th to 20th	Day	24% 3 7% 15% 31% 20%	3110
	21st to end	Day	33% 4 7% 15% 30% 11%	3497
February	1st to 10th	Day	34% 3 8% 13% 22% 20%	1900
	11th to 20th	Day	34% 4 7% 17% 21% 17%	1859
	21st to end	Day	28% 4 7% 16% 24% 21%	1570
March	1st to 10th	Day	38% 4 6% 13% 20% 19%	3184
	11th to 20th	Day	47% 5% 7% 11% 18% 12%	3480
	21st to end	Day	31% 5% 8% 15% 18% 21%	3814
April	1st to 10th	Day	33% 4 9% 18% 19% 18%	2138
	11th to 20th	Day	34% 5% 8% 18% 20% 16%	2254
	21st to end	Day	34% 4 8% 20% 20% 14%	2280
May	1st to 10th	Day	38% 7% 10% 13% 20% 11%	4106
	11th to 20th	Day	36% 5% 8% 19% 21% 11%	4086
	21st to end	Day	33% 8% 11% 26% 16% 6%	4489
June	1st to 10th	Day	25% 6% 13% 31% 21% 4	2470
	11th to 20th	Day	27% 5% 13% 27% 22% 6%	2470
	21st to end	Day	34% 6% 13% 23% 19% 5%	2470
July	1st to 10th	Day	28% 7% 18% 37% 9% 1	4056
	11th to 20th	Day	24% 6% 16% 34% 18% 3	4051
	21st to end	Day	29% 7% 18% 29% 17% 1	4213
August	1st to 10th	Day	15% 4 11% 39% 30% 1	3772
	11th to 20th	Day	19% 5% 18% 43% 14% 2	3762
	21st to end	Day	31% 7% 15% 25% 20% 2	4179
September	1st to 10th	Day	39% 7% 12% 18% 17% 8%	2119
	11th to 20th	Day	38% 7% 12% 21% 17% 6%	2090
	21st to end	Day	31% 6% 13% 20% 18% 12%	2090
October	1st to 10th	Day	17% 5% 6% 14% 26% 33%	3480
	11th to 20th	Day	30% 3 7% 16% 20% 25%	3458
	21st to end	Day	24% 2 4 19% 38% 13%	3443
November	1st to 10th	Day	34% 5% 9% 20% 20% 13%	1837
	11th to 20th	Day	29% 4 7% 19% 22% 19%	1800
	21st to end	Day	34% 3 6% 19% 22% 16%	1800
December	1st to 10th	Day	45% 3 7% 16% 18% 11%	2940
	11th to 20th	Day	38% 5% 7% 15% 22% 14%	3389
	21st to end	Day	26% 2 4 18% 27% 23%	4488
January	1st to 10th	Night	26% 3 6% 11% 29% 24%	4238
	11th to 20th	Night	21% 2 4 19% 26% 28%	4109
	21st to end	Night	36% 3 6% 13% 28% 15%	4192
February	1st to 10th	Night	30% 4 8% 14% 22% 22%	2280
	11th to 20th	Night	33% 3 7% 17% 22% 18%	2218
	21st to end	Night	31% 5% 6% 15% 22% 21%	1884
March	1st to 10th	Night	29% 5% 11% 16% 23% 15%	3676
	11th to 20th	Night	43% 6% 7% 13% 16% 14%	3480
	21st to end	Night	32% 5% 10% 16% 17% 20%	3817
April	1st to 10th	Night	30% 5% 10% 19% 17% 20%	2036
	11th to 20th	Night	32% 5% 10% 16% 17% 18%	1877
	21st to end	Night	31% 4 10% 22% 19% 14%	1900
May	1st to 10th	Night	38% 6% 9% 18% 17% 12%	2864
	11th to 20th	Night	27% 8% 11% 23% 21% 10%	2824
	21st to end	Night	28% 7% 14% 29% 12% 10%	3099
June	1st to 10th	Night	14% 8% 17% 36% 22% 2	1710
	11th to 20th	Night	19% 6% 16% 30% 23% 7%	1710
	21st to end	Night	23% 6% 18% 28% 19% 5%	1710
July	1st to 10th	Night	20% 7% 24% 38% 10% 1	2805
	11th to 20th	Night	17% 6% 18% 36% 20% 3	2796
	21st to end	Night	26% 6% 21% 32% 14% 1	3107
August	1st to 10th	Night	11% 4 15% 41% 28% 1	3144
	11th to 20th	Night	16% 6% 25% 42% 11% 2	3143
	21st to end	Night	25% 8% 21% 27% 17% 2	3487
September	1st to 10th	Night	31% 8% 12% 23% 18% 8%	2061
	11th to 20th	Night	32% 7% 15% 23% 18% 5%	2090
	21st to end	Night	26% 6% 14% 24% 18% 13%	2090
October	1st to 10th	Night	15% 3 8% 15% 22% 36%	3480
	11th to 20th	Night	25% 3 8% 15% 25% 25%	3460
	21st to end	Night	22% 2 5% 19% 35% 17%	4071
November	1st to 10th	Night	29% 4 8% 20% 25% 15%	2456
	11th to 20th	Night	25% 4 9% 22% 21% 20%	2600
	21st to end	Night	33% 4 8% 16% 22% 17%	2600
December	1st to 10th	Night	44% 3 8% 15% 15% 14%	4250
	11th to 20th	Night	36% 3 6% 15% 21% 19%	4817
	21st to end	Night	26% 3 5% 19% 28% 19%	6490

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% 8% 1	300
	11th to 20th	Day	14% 10% 38% 28% 9% 1	300
	21st to end	Day	12% 11% 41% 27% 9%	300
February	1st to 10th	Day	19% 14% 33% 22% 11% 1	270
	11th to 20th	Day	19% 13% 40% 21% 6% 1	270
	21st to end	Day	14% 12% 52% 20% 2	225
March	1st to 10th	Day	14% 10% 45% 27% 3	270
	11th to 20th	Day	13% 13% 43% 22% 10%	270
	21st to end	Day	11% 15% 48% 21% 6%	297
April	1st to 10th	Day	10% 13% 44% 29% 4	318
	11th to 20th	Day	11% 15% 42% 27% 6%	452
	21st to end	Day	11% 12% 42% 28% 7%	460
May	1st to 10th	Day	13% 6% 41% 32% 7% 1	639
	11th to 20th	Day	14% 5% 34% 34% 11% 1	675
	21st to end	Day	13% 7% 30% 37% 12% 2	734
June	1st to 10th	Day	5% 3 19% 48% 23% 3	680
	11th to 20th	Day	6% 1 20% 49% 21% 4	680
	21st to end	Day	5% 1 13% 42% 31% 8%	680
July	1st to 10th	Day	8% 1 8% 38% 35% 11%	671
	11th to 20th	Day	4 1 5% 37% 46% 7%	668
	21st to end	Day	4 1 4 39% 40% 12%	673
August	1st to 10th	Day	2 2 35% 43% 17%	487
	11th to 20th	Day	8% 1 4 30% 42% 14%	477
	21st to end	Day	6% 2 4 29% 41% 18%	539
September	1st to 10th	Day	10% 3 3 25% 41% 19%	329
	11th to 20th	Day	7% 1 3 25% 44% 20%	300
	21st to end	Day	12% 1 6% 29% 38% 14%	300
October	1st to 10th	Day	5% 2 11% 38% 36% 9%	300
	11th to 20th	Day	12% 3 18% 42% 21% 3	300
	21st to end	Day	14% 10% 26% 29% 18% 3	330
November	1st to 10th	Day	14% 7% 28% 35% 14% 2	300
	11th to 20th	Day	16% 11% 27% 25% 15% 7%	300
	21st to end	Day	15% 13% 38% 24% 8% 2	300
December	1st to 10th	Day	17% 6% 31% 29% 13% 3	300
	11th to 20th	Day	12% 12% 39% 25% 11% 1	300
	21st to end	Day	16% 10% 33% 30% 11% 1	330
January	1st to 10th	Night	12% 9% 38% 34% 8%	1000
	11th to 20th	Night	14% 9% 38% 32% 7%	911
	21st to end	Night	14% 9% 38% 31% 7%	840
February	1st to 10th	Night	13% 13% 39% 28% 6%	760
	11th to 20th	Night	15% 11% 43% 27% 4	744
	21st to end	Night	14% 13% 49% 23% 1	628
March	1st to 10th	Night	14% 12% 47% 24% 3	728
	11th to 20th	Night	14% 9% 40% 33% 4	570
	21st to end	Night	10% 12% 51% 22% 4	627
April	1st to 10th	Night	7% 9% 52% 29% 4	570
	11th to 20th	Night	11% 12% 52% 23% 1	563
	21st to end	Night	11% 11% 52% 23% 4	570
May	1st to 10th	Night	11% 8% 49% 29% 3	570
	11th to 20th	Night	9% 7% 43% 34% 6% 1	561
	21st to end	Night	9% 6% 39% 38% 7%	617
June	1st to 10th	Night	3 2 25% 57% 12% 1	570
	11th to 20th	Night	3 1 35% 52% 9%	570
	21st to end	Night	5% 1 21% 52% 20% 1	570
July	1st to 10th	Night	6% 2 8% 57% 26% 2	555
	11th to 20th	Night	2 1 9% 61% 27%	552
	21st to end	Night	3 1 8% 58% 29% 2	624
August	1st to 10th	Night	2 4 55% 38% 1	567
	11th to 20th	Night	4 1 4 51% 37% 3	564
	21st to end	Night	5% 2 6% 45% 39% 4	627
September	1st to 10th	Night	6% 2 7% 44% 38% 3	570
	11th to 20th	Night	8% 2 7% 47% 35% 2	570
	21st to end	Night	7% 2 13% 46% 29% 2	570
October	1st to 10th	Night	6% 2 16% 50% 25% 1	570
	11th to 20th	Night	11% 4 24% 42% 18% 2	570
	21st to end	Night	11% 7% 27% 35% 18% 2	799
November	1st to 10th	Night	12% 6% 25% 39% 17% 1	896
	11th to 20th	Night	10% 6% 32% 37% 14% 2	1000
	21st to end	Night	14% 8% 33% 34% 11% 1	1000
December	1st to 10th	Night	14% 6% 30% 41% 9% 1	1000
	11th to 20th	Night	16% 8% 34% 34% 8%	1000
	21st to end	Night	12% 8% 37% 34% 8%	1100

Page generated at 2025-01-19 02:06:46. Version ac07

Copyright © 2025 Attilla Danko.