The Cove Palisades State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the The Cove Palisades State Park clear sky chart from 2005-11-06 to 2026-09-29.

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	5% 6% 2 6% 4 4 4 3 5% 7% 54%	158619
	Night	6% 7% 3 7% 4 4 4 4 5% 7% 49%	150173
Transparency	Day	32% 3 10% 24% 21% 10%	153415
	Night	37% 4 12% 25% 17% 6%	146375
Seeing	Day	10% 14% 26% 27% 18% 6%	17032
	Night	9% 9% 23% 38% 19% 2	25994

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	10% 16% 4 12% 7% 8% 7% 5% 7% 7% 18%	4722
	11th to 20th	Day	8% 9% 3 7% 4 4 4 3 5% 6% 48%	4740
	21st to end	Day	6% 9% 3 10% 6% 5% 5% 4 7% 9% 37%	5543
February	1st to 10th	Day	8% 12% 4 10% 6% 4 6% 5% 7% 8% 31%	1890
	11th to 20th	Day	8% 11% 3 8% 6% 6% 6% 6% 7% 7% 32%	1845
	21st to end	Day	6% 12% 4 9% 6% 5% 6% 5% 7% 8% 32%	1730
March	1st to 10th	Day	5% 9% 4 9% 6% 6% 5% 5% 8% 10% 33%	4658
	11th to 20th	Day	6% 11% 4 9% 6% 6% 6% 4 5% 6% 37%	5110
	21st to end	Day	5% 10% 4 10% 7% 7% 8% 5% 7% 8% 28%	5865
April	1st to 10th	Day	8% 11% 3 8% 6% 6% 6% 5% 7% 8% 33%	2520
	11th to 20th	Day	7% 9% 3 8% 6% 5% 4 4 6% 7% 40%	2489
	21st to end	Day	7% 5% 3 6% 4 4 5% 4 6% 7% 47%	2603
May	1st to 10th	Day	7% 5% 2 5% 3 4 4 3 5% 7% 56%	8195
	11th to 20th	Day	5% 4 2 6% 4 5% 4 4 5% 7% 54%	8160
	21st to end	Day	6% 5% 2 5% 4 3 4 4 6% 8% 54%	8992
June	1st to 10th	Day	8% 7% 3 6% 4 4 4 3 6% 7% 48%	2940
	11th to 20th	Day	6% 5% 1 5% 4 3 4 3 5% 7% 56%	2940
	21st to end	Day	3 3 1 3 2 3 3 3 5% 6% 67%	2940
July	1st to 10th	Day	1 1 2 1 2 2 2 3 5% 81%	8219
	11th to 20th	Day	2 1 1 2 2 2 2 2 3 3 81%	8220
	21st to end	Day	1 1 1 2 1 2 2 2 3 4 81%	8922
August	1st to 10th	Day	1 2 1 2 2 2 2 2 4 5% 78%	7782
	11th to 20th	Day	1 2 1 2 2 2 3 3 4 6% 74%	7532
	21st to end	Day	4 3 1 3 2 2 2 2 4 6% 70%	7750
September	1st to 10th	Day	2 2 1 3 2 3 3 2 4 5% 75%	2520
	11th to 20th	Day	4 3 2 5% 3 4 4 4 4 7% 61%	2520
	21st to end	Day	7% 5% 1 4 3 3 4 3 4 6% 59%	2227
October	1st to 10th	Day	4 4 2 4 3 3 4 3 4 5% 64%	3280
	11th to 20th	Day	5% 5% 2 6% 4 5% 5% 4 7% 9% 48%	3261
	21st to end	Day	7% 9% 3 7% 5% 7% 6% 4 5% 8% 39%	3380
November	1st to 10th	Day	9% 9% 3 9% 6% 6% 6% 4 7% 7% 34%	1854
	11th to 20th	Day	8% 9% 4 11% 7% 7% 6% 6% 8% 8% 27%	1690
	21st to end	Day	8% 9% 3 8% 6% 5% 6% 5% 7% 9% 34%	1680
December	1st to 10th	Day	7% 8% 3 6% 4 5% 4 4 5% 7% 47%	2700
	11th to 20th	Day	9% 12% 5% 11% 7% 7% 7% 5% 7% 9% 22%	3108
	21st to end	Day	8% 12% 5% 13% 8% 7% 6% 5% 6% 7% 24%	4092
January	1st to 10th	Night	10% 14% 6% 12% 7% 7% 7% 5% 7% 7% 17%	8172
	11th to 20th	Night	8% 8% 3 8% 5% 3 3 3 4 6% 49%	8220
	21st to end	Night	7% 11% 4 9% 6% 6% 5% 4 5% 7% 37%	8655
February	1st to 10th	Night	7% 11% 4 9% 7% 6% 6% 4 7% 9% 30%	2730
	11th to 20th	Night	7% 12% 4 8% 6% 4 5% 4 6% 8% 36%	2662
	21st to end	Night	7% 12% 4 9% 6% 5% 5% 5% 6% 9% 32%	2076
March	1st to 10th	Night	6% 9% 3 7% 5% 6% 6% 5% 8% 9% 36%	5452
	11th to 20th	Night	5% 9% 3 7% 5% 5% 5% 4 6% 7% 43%	5110
	21st to end	Night	6% 10% 4 10% 6% 7% 7% 5% 7% 10% 27%	5352
April	1st to 10th	Night	8% 10% 3 7% 5% 5% 5% 4 6% 8% 38%	2100
	11th to 20th	Night	7% 9% 3 8% 5% 5% 5% 4 6% 7% 42%	2079
	21st to end	Night	9% 7% 2 6% 4 4 5% 4 6% 8% 45%	2011
May	1st to 10th	Night	7% 5% 1 4 3 3 3 3 4 7% 59%	4723
	11th to 20th	Night	5% 6% 2 6% 3 4 4 3 5% 7% 56%	4700
	21st to end	Night	8% 5% 2 4 3 3 3 3 5% 7% 57%	5181
June	1st to 10th	Night	10% 7% 2 5% 4 4 4 3 6% 6% 49%	1680
	11th to 20th	Night	5% 4 2 4 3 4 3 3 5% 8% 58%	1680
	21st to end	Night	5% 3 1 3 2 2 3 2 4 5% 69%	1680
July	1st to 10th	Night	1 1 2 1 2 3 2 3 4 82%	4740
	11th to 20th	Night	2 2 1 3 2 1 2 2 2 3 79%	4740
	21st to end	Night	1 1 2 2 2 2 2 3 5% 79%	5153
August	1st to 10th	Night	1 1 1 2 2 2 3 3 5% 6% 74%	5012
	11th to 20th	Night	1 1 1 3 3 3 4 3 4 5% 72%	5324
	21st to end	Night	3 3 1 4 2 2 3 2 4 5% 72%	6499
September	1st to 10th	Night	2 1 1 2 2 2 2 3 3 4 77%	2100
	11th to 20th	Night	4 2 2 5% 3 3 3 3 6% 8% 62%	2100
	21st to end	Night	6% 4 1 3 2 3 3 3 4 6% 63%	2346
October	1st to 10th	Night	4 4 2 4 3 2 2 2 4 4 69%	3920
	11th to 20th	Night	5% 5% 2 5% 3 4 4 4 7% 8% 52%	3897
	21st to end	Night	7% 6% 3 8% 6% 5% 5% 5% 7% 7% 40%	4423
November	1st to 10th	Night	10% 10% 3 8% 7% 5% 6% 4 6% 9% 34%	2665
	11th to 20th	Night	9% 10% 4 9% 7% 6% 5% 4 7% 8% 30%	2929
	21st to end	Night	6% 10% 3 6% 5% 6% 6% 4 7% 8% 39%	2940
December	1st to 10th	Night	6% 7% 3 7% 3 4 4 3 4 7% 52%	4700
	11th to 20th	Night	9% 14% 6% 13% 7% 7% 7% 5% 7% 7% 20%	5316
	21st to end	Night	9% 12% 5% 12% 7% 7% 5% 4 6% 6% 26%	7106

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	65% 4 14% 13% 3	4723
	11th to 20th	Day	40% 2 10% 23% 20% 4	4740
	21st to end	Day	44% 4 11% 22% 15% 4	5543
February	1st to 10th	Day	51% 5% 14% 21% 7% 1	1890
	11th to 20th	Day	50% 5% 13% 21% 10% 1	1854
	21st to end	Day	49% 6% 15% 18% 10% 1	1730
March	1st to 10th	Day	47% 4 7% 24% 16% 2	4658
	11th to 20th	Day	47% 4 10% 27% 12%	5110
	21st to end	Day	54% 5% 12% 23% 7%	5865
April	1st to 10th	Day	50% 4 12% 22% 11% 1	2520
	11th to 20th	Day	45% 4 13% 21% 15% 3	2492
	21st to end	Day	37% 4 13% 29% 15% 3	2603
May	1st to 10th	Day	30% 3 6% 29% 28% 4	8195
	11th to 20th	Day	30% 4 11% 28% 25% 2	8163
	21st to end	Day	29% 3 16% 32% 18% 1	8994
June	1st to 10th	Day	37% 3 10% 30% 18% 3	2940
	11th to 20th	Day	30% 3 9% 32% 21% 4	2940
	21st to end	Day	19% 3 10% 32% 27% 9%	2940
July	1st to 10th	Day	9% 2 4 20% 33% 31%	8151
	11th to 20th	Day	11% 2 3 10% 25% 49%	8145
	21st to end	Day	10% 2 4 25% 39% 20%	8723
August	1st to 10th	Day	10% 1 2 12% 38% 35%	6164
	11th to 20th	Day	13% 3 7% 34% 32% 11%	5943
	21st to end	Day	15% 2 5% 31% 35% 13%	6077
September	1st to 10th	Day	15% 3 6% 26% 33% 18%	2520
	11th to 20th	Day	25% 3 9% 27% 26% 10%	2520
	21st to end	Day	28% 3 10% 28% 23% 9%	2227
October	1st to 10th	Day	25% 3 9% 26% 26% 12%	3280
	11th to 20th	Day	33% 5% 17% 26% 17% 2	3261
	21st to end	Day	44% 4 9% 28% 14% 1	3380
November	1st to 10th	Day	50% 4 13% 23% 9% 1	1854
	11th to 20th	Day	54% 5% 16% 17% 7%	1690
	21st to end	Day	48% 5% 15% 21% 10% 1	1680
December	1st to 10th	Day	37% 4 15% 28% 16% 1	2700
	11th to 20th	Day	59% 4 17% 17% 3	3108
	21st to end	Day	59% 4 15% 19% 3	4092
January	1st to 10th	Night	65% 5% 14% 13% 3	8172
	11th to 20th	Night	39% 2 9% 26% 20% 4	8220
	21st to end	Night	48% 3 11% 19% 15% 4	8655
February	1st to 10th	Night	51% 5% 17% 18% 8%	2730
	11th to 20th	Night	47% 5% 16% 22% 8% 1	2664
	21st to end	Night	51% 6% 12% 19% 10% 1	2076
March	1st to 10th	Night	46% 4 9% 27% 13% 2	5452
	11th to 20th	Night	41% 5% 14% 30% 10%	5110
	21st to end	Night	54% 7% 15% 19% 5%	5352
April	1st to 10th	Night	45% 5% 17% 22% 10% 1	2100
	11th to 20th	Night	44% 5% 14% 23% 12% 2	2079
	21st to end	Night	40% 6% 14% 27% 12% 3	2011
May	1st to 10th	Night	28% 2 6% 34% 29% 1	4721
	11th to 20th	Night	30% 4 16% 34% 16% 1	4700
	21st to end	Night	28% 3 23% 32% 13% 1	5182
June	1st to 10th	Night	36% 5% 13% 29% 15% 2	1680
	11th to 20th	Night	27% 3 13% 37% 17% 3	1680
	21st to end	Night	20% 2 11% 34% 25% 8%	1680
July	1st to 10th	Night	9% 2 5% 28% 30% 25%	4700
	11th to 20th	Night	13% 2 4 12% 26% 43%	4692
	21st to end	Night	10% 2 3 30% 37% 16%	5040
August	1st to 10th	Night	10% 2 3 14% 40% 31%	3957
	11th to 20th	Night	14% 3 10% 32% 33% 7%	4188
	21st to end	Night	14% 2 7% 33% 35% 9%	5092
September	1st to 10th	Night	13% 3 7% 28% 33% 16%	2100
	11th to 20th	Night	22% 4 10% 28% 24% 11%	2100
	21st to end	Night	25% 2 9% 28% 26% 10%	2346
October	1st to 10th	Night	22% 2 9% 28% 34% 6%	3920
	11th to 20th	Night	31% 3 21% 26% 17% 2	3897
	21st to end	Night	42% 5% 11% 28% 13% 1	4423
November	1st to 10th	Night	49% 5% 13% 21% 11% 1	2665
	11th to 20th	Night	53% 5% 15% 22% 5%	2929
	21st to end	Night	44% 4 16% 23% 11% 1	2940
December	1st to 10th	Night	33% 4 12% 34% 17%	4700
	11th to 20th	Night	63% 4 14% 15% 4	5316
	21st to end	Night	56% 5% 16% 18% 5%	7106

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	20% 18% 30% 20% 11% 1	220
	11th to 20th	Day	16% 8% 25% 35% 11% 5%	220
	21st to end	Day	13% 14% 30% 22% 18% 3	367
February	1st to 10th	Day	17% 19% 26% 23% 13% 1	430
	11th to 20th	Day	14% 20% 32% 23% 9% 2	425
	21st to end	Day	17% 22% 29% 24% 7% 1	446
March	1st to 10th	Day	14% 19% 34% 26% 7% 1	540
	11th to 20th	Day	15% 22% 26% 23% 13% 1	540
	21st to end	Day	17% 22% 27% 25% 8% 1	594
April	1st to 10th	Day	16% 20% 25% 23% 13% 4	540
	11th to 20th	Day	14% 20% 30% 22% 10% 5%	532
	21st to end	Day	10% 22% 25% 26% 14% 3	540
May	1st to 10th	Day	10% 19% 26% 24% 15% 5%	543
	11th to 20th	Day	17% 15% 25% 23% 15% 5%	568
	21st to end	Day	11% 13% 23% 28% 18% 8%	617
June	1st to 10th	Day	10% 16% 21% 26% 18% 8%	570
	11th to 20th	Day	8% 17% 28% 28% 15% 3	570
	21st to end	Day	4 10% 24% 31% 23% 8%	570
July	1st to 10th	Day	2 7% 28% 31% 24% 8%	566
	11th to 20th	Day	2 9% 29% 25% 28% 8%	564
	21st to end	Day	1 6% 25% 30% 26% 11%	619
August	1st to 10th	Day	1 5% 24% 34% 24% 12%	567
	11th to 20th	Day	3 4 19% 32% 26% 15%	557
	21st to end	Day	3 8% 23% 31% 24% 12%	627
September	1st to 10th	Day	3 7% 24% 26% 28% 12%	570
	11th to 20th	Day	6% 9% 22% 29% 26% 9%	570
	21st to end	Day	9% 12% 19% 31% 23% 6%	563
October	1st to 10th	Day	10% 10% 22% 31% 20% 6%	530
	11th to 20th	Day	13% 12% 24% 25% 22% 4	530
	21st to end	Day	12% 18% 26% 22% 18% 4	480
November	1st to 10th	Day	13% 12% 29% 29% 15% 2	330
	11th to 20th	Day	12% 19% 21% 30% 14% 5%	225
	21st to end	Day	16% 13% 26% 28% 15% 2	220
December	1st to 10th	Day	14% 16% 25% 21% 17% 7%	220
	11th to 20th	Day	16% 18% 30% 30% 5% 1	220
	21st to end	Day	12% 20% 29% 27% 10% 2	242
January	1st to 10th	Night	14% 15% 28% 28% 11% 3	840
	11th to 20th	Night	12% 13% 26% 30% 17% 2	840
	21st to end	Night	12% 9% 24% 37% 16% 2	924
February	1st to 10th	Night	12% 11% 28% 33% 15% 1	840
	11th to 20th	Night	12% 11% 28% 36% 12% 1	824
	21st to end	Night	13% 15% 31% 33% 8%	692
March	1st to 10th	Night	12% 14% 30% 33% 11% 1	840
	11th to 20th	Night	10% 12% 28% 35% 13% 1	840
	21st to end	Night	9% 14% 32% 32% 13% 1	924
April	1st to 10th	Night	13% 12% 24% 32% 18% 1	840
	11th to 20th	Night	10% 13% 27% 33% 15% 2	831
	21st to end	Night	11% 9% 24% 37% 17% 1	751
May	1st to 10th	Night	9% 8% 20% 42% 21% 1	420
	11th to 20th	Night	10% 6% 21% 41% 22% 1	414
	21st to end	Night	8% 6% 16% 45% 23% 1	455
June	1st to 10th	Night	14% 5% 20% 43% 19% 1	420
	11th to 20th	Night	6% 4 25% 48% 16% 1	420
	21st to end	Night	5% 2 14% 54% 25%	420
July	1st to 10th	Night	2 1 11% 61% 25%	410
	11th to 20th	Night	1 17% 59% 21% 1	408
	21st to end	Night	1 1 10% 56% 30% 1	460
August	1st to 10th	Night	2 8% 51% 35% 4	531
	11th to 20th	Night	2 1 6% 45% 40% 6%	630
	21st to end	Night	2 3 18% 47% 28% 2	924
September	1st to 10th	Night	2 3 18% 42% 31% 3	840
	11th to 20th	Night	5% 3 14% 44% 30% 5%	840
	21st to end	Night	7% 4 16% 41% 27% 4	832
October	1st to 10th	Night	8% 5% 20% 40% 24% 3	800
	11th to 20th	Night	8% 8% 21% 37% 24% 3	800
	21st to end	Night	11% 7% 26% 35% 16% 4	880
November	1st to 10th	Night	10% 11% 26% 37% 15%	820
	11th to 20th	Night	13% 14% 25% 33% 14% 1	840
	21st to end	Night	10% 11% 25% 34% 18% 2	840
December	1st to 10th	Night	13% 9% 24% 33% 18% 2	840
	11th to 20th	Night	14% 11% 29% 32% 13% 1	840
	21st to end	Night	13% 17% 31% 28% 10% 1	924

Page generated at 2026-09-26 01:18:43. Version ac07

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