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 2024-10-25.

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	6% 3 1 3 2 2 3 3 4 6% 66%	100821
	Night	8% 4 1 3 2 2 3 2 4 5% 64%	98209
Transparency	Day	10% 48% 5% 11% 12% 14%	100582
	Night	13% 48% 4 10% 11% 14%	98038
Seeing	Day	8% 7% 20% 34% 26% 5%	15536
	Night	8% 3 13% 33% 33% 10%	25004

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 6% 4 4 5% 4 5% 5% 47%	2777
	11th to 20th	Day	16% 7% 3 7% 4 4 4 4 5% 7% 38%	2860
	21st to end	Day	18% 8% 2 7% 4 4 4 3 5% 8% 37%	3146
February	1st to 10th	Day	17% 6% 2 4 3 3 4 4 4 5% 49%	1710
	11th to 20th	Day	12% 6% 2 5% 3 4 4 3 6% 8% 48%	1827
	21st to end	Day	13% 8% 2 3 4 4 4 4 5% 6% 47%	1570
March	1st to 10th	Day	14% 9% 3 7% 5% 5% 4 4 7% 8% 35%	3344
	11th to 20th	Day	10% 5% 1 4 3 3 4 3 4 6% 58%	3490
	21st to end	Day	12% 9% 2 6% 5% 4 5% 5% 5% 7% 41%	3916
April	1st to 10th	Day	10% 5% 2 4 4 3 4 4 5% 7% 52%	2280
	11th to 20th	Day	8% 4 1 3 3 3 4 3 6% 6% 58%	2249
	21st to end	Day	5% 3 1 3 2 3 3 4 5% 7% 63%	2280
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	2 2 1 2 2 2 2 3 5% 5% 74%	1900
	11th to 20th	Day	4 2 1 3 2 2 2 3 3 6% 72%	1900
	21st to end	Day	6% 3 1 3 2 2 3 2 4 6% 68%	2025
November	1st to 10th	Day	8% 5% 1 3 3 2 3 3 5% 7% 63%	1839
	11th to 20th	Day	8% 4 2 4 2 2 3 4 4 6% 62%	1710
	21st to end	Day	11% 4 1 4 3 4 3 3 4 6% 58%	1685
December	1st to 10th	Day	13% 6% 2 5% 3 4 3 4 6% 6% 47%	1520
	11th to 20th	Day	28% 7% 2 4 4 3 3 3 5% 6% 34%	1928
	21st to end	Day	22% 9% 2 5% 4 4 3 3 5% 7% 38%	2794
January	1st to 10th	Night	12% 6% 2 5% 3 3 3 3 3 6% 54%	4159
	11th to 20th	Night	16% 9% 3 5% 3 4 4 4 5% 6% 40%	4110
	21st to end	Night	18% 8% 2 7% 4 3 3 3 5% 7% 39%	4521
February	1st to 10th	Night	16% 6% 1 4 3 3 3 3 4 6% 52%	2470
	11th to 20th	Night	11% 5% 1 4 3 3 4 3 5% 8% 53%	2238
	21st to end	Night	12% 7% 2 4 3 3 3 3 4 6% 53%	1884
March	1st to 10th	Night	18% 10% 2 6% 5% 4 4 3 5% 6% 36%	3525
	11th to 20th	Night	7% 6% 2 4 2 3 3 3 3 6% 61%	3490
	21st to end	Night	14% 11% 2 5% 4 3 4 3 5% 7% 42%	3736
April	1st to 10th	Night	8% 6% 2 4 4 3 4 3 5% 6% 55%	1900
	11th to 20th	Night	7% 4 1 4 4 3 3 3 4 5% 63%	1879
	21st to end	Night	3 4 2 2 2 2 3 3 6% 9% 64%	1900
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	4 3 1 3 2 2 3 2 4 5% 73%	2280
	11th to 20th	Night	3 3 2 2 3 3 2 4 5% 73%	2280
	21st to end	Night	4 3 1 3 2 2 2 2 4 5% 71%	2436
November	1st to 10th	Night	6% 4 1 3 3 2 2 3 4 5% 66%	2239
	11th to 20th	Night	7% 4 2 4 2 3 3 3 5% 7% 61%	2470
	21st to end	Night	6% 5% 2 4 3 3 4 3 5% 6% 59%	2493
December	1st to 10th	Night	14% 5% 2 3 3 3 3 3 5% 5% 53%	2660
	11th to 20th	Night	27% 8% 1 4 4 3 4 3 5% 5% 37%	3276
	21st to end	Night	19% 7% 3 6% 4 4 4 3 4 6% 40%	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	20% 42% 8% 21% 8% 1	2777
	11th to 20th	Day	33% 40% 8% 11% 5% 2	2860
	21st to end	Day	31% 41% 5% 15% 6% 2	3146
February	1st to 10th	Day	17% 66% 4 4 7% 4	1710
	11th to 20th	Day	13% 64% 4 8% 7% 4	1837
	21st to end	Day	11% 66% 5% 8% 8% 2	1570
March	1st to 10th	Day	25% 47% 9% 7% 10% 2	3344
	11th to 20th	Day	11% 41% 5% 21% 10% 11%	3490
	21st to end	Day	22% 47% 9% 15% 6% 1	3916
April	1st to 10th	Day	13% 65% 2 11% 5% 3	2280
	11th to 20th	Day	7% 66% 4 11% 10% 2	2252
	21st to end	Day	5% 66% 7% 10% 10% 3	2280
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	3 59% 2 7% 10% 19%	1900
	11th to 20th	Day	7% 59% 3 8% 10% 11%	1900
	21st to end	Day	7% 60% 2 8% 11% 13%	2025
November	1st to 10th	Day	6% 58% 3 8% 13% 12%	1839
	11th to 20th	Day	13% 60% 4 6% 10% 6%	1710
	21st to end	Day	12% 60% 4 8% 10% 6%	1685
December	1st to 10th	Day	16% 61% 4 7% 5% 7%	1520
	11th to 20th	Day	31% 48% 3 5% 8% 6%	1928
	21st to end	Day	29% 39% 5% 15% 9% 4	2794
January	1st to 10th	Night	19% 38% 10% 19% 10% 3	4159
	11th to 20th	Night	32% 40% 7% 14% 5% 2	4110
	21st to end	Night	32% 41% 5% 10% 9% 3	4521
February	1st to 10th	Night	17% 65% 3 5% 6% 4	2470
	11th to 20th	Night	11% 65% 3 7% 11% 4	2239
	21st to end	Night	9% 65% 4 10% 8% 4	1884
March	1st to 10th	Night	30% 45% 6% 9% 8% 2	3525
	11th to 20th	Night	11% 41% 3 17% 17% 11%	3490
	21st to end	Night	25% 44% 8% 13% 8% 1	3736
April	1st to 10th	Night	12% 65% 3 9% 8% 3	1900
	11th to 20th	Night	9% 65% 4 10% 10% 3	1879
	21st to end	Night	5% 65% 6% 11% 8% 4	1900
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	5% 58% 2 6% 8% 21%	2280
	11th to 20th	Night	6% 59% 4 6% 14% 12%	2280
	21st to end	Night	6% 59% 2 8% 11% 14%	2436
November	1st to 10th	Night	6% 58% 2 9% 14% 11%	2239
	11th to 20th	Night	13% 60% 3 7% 12% 6%	2470
	21st to end	Night	13% 61% 4 6% 10% 6%	2493
December	1st to 10th	Night	14% 60% 5% 9% 7% 6%	2660
	11th to 20th	Night	29% 50% 3 5% 7% 6%	3276
	21st to end	Night	29% 39% 5% 10% 13% 4	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% 14% 26% 30% 16% 1	382
March	1st to 10th	Day	20% 12% 27% 30% 10% 1	460
	11th to 20th	Day	19% 11% 26% 26% 17% 2	460
	21st to end	Day	15% 12% 32% 30% 10%	506
April	1st to 10th	Day	15% 10% 29% 29% 16% 2	460
	11th to 20th	Day	10% 13% 29% 31% 15% 2	452
	21st to end	Day	5% 10% 32% 32% 17% 5%	460
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% 18% 33% 31% 7%	514
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	13% 7% 18% 36% 23% 3	628
March	1st to 10th	Night	17% 6% 18% 33% 21% 4	760
	11th to 20th	Night	13% 6% 17% 31% 26% 7%	760
	21st to end	Night	12% 6% 20% 34% 23% 4	836
April	1st to 10th	Night	11% 4 20% 37% 25% 4	760
	11th to 20th	Night	8% 7% 21% 35% 23% 6%	751
	21st to end	Night	4 4 24% 33% 25% 10%	760
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% 31% 17%	812
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 2024-10-22 17:21:03. Version ac07

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