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 2025-05-26.

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% 7% 2 6% 4 4 4 4 5% 7% 50%	118126
	Night	7% 8% 3 7% 5% 4 5% 4 5% 7% 46%	119967
Transparency	Day	36% 3 10% 23% 18% 9%	117869
	Night	40% 4 12% 24% 15% 5%	119813
Seeing	Day	10% 14% 26% 27% 17% 6%	15261
	Night	9% 9% 23% 37% 19% 2	24401

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	11% 17% 5% 12% 6% 7% 6% 4 6% 6% 18%	3639
	11th to 20th	Day	11% 11% 4 8% 5% 4 5% 3 5% 5% 39%	3640
	21st to end	Day	7% 9% 3 8% 5% 5% 4 3 6% 8% 41%	4279
February	1st to 10th	Day	8% 12% 4 10% 6% 4 6% 5% 6% 8% 31%	1800
	11th to 20th	Day	8% 11% 3 7% 6% 6% 6% 6% 6% 7% 33%	1755
	21st to end	Day	6% 11% 4 10% 6% 5% 6% 6% 7% 8% 32%	1650
March	1st to 10th	Day	5% 9% 4 9% 6% 6% 5% 5% 8% 10% 33%	4557
	11th to 20th	Day	5% 11% 4 9% 6% 6% 6% 4 5% 6% 37%	5000
	21st to end	Day	5% 10% 4 11% 7% 7% 8% 5% 7% 8% 27%	5739
April	1st to 10th	Day	8% 11% 3 8% 6% 6% 5% 5% 7% 7% 32%	2400
	11th to 20th	Day	7% 9% 3 8% 6% 5% 4 4 6% 6% 41%	2369
	21st to end	Day	6% 5% 3 6% 4 4 5% 4 6% 8% 47%	2479
May	1st to 10th	Day	10% 8% 2 7% 4 4 4 3 5% 6% 47%	4560
	11th to 20th	Day	5% 4 1 4 3 3 3 3 4 5% 64%	4517
	21st to end	Day	8% 6% 2 6% 4 3 4 4 6% 8% 48%	4886
June	1st to 10th	Day	8% 8% 3 7% 4 4 4 3 6% 8% 45%	2660
	11th to 20th	Day	6% 6% 2 5% 4 4 4 3 5% 7% 54%	2660
	21st to end	Day	3 3 1 3 2 3 3 3 5% 6% 68%	2660
July	1st to 10th	Day	1 1 1 1 1 2 2 2 3 85%	4420
	11th to 20th	Day	1 1 1 2 1 2 2 3 4 83%	4420
	21st to end	Day	2 1 2 1 2 2 2 3 4 82%	4790
August	1st to 10th	Day	2 2 1 3 2 2 3 2 4 5% 74%	4224
	11th to 20th	Day	1 2 1 3 2 3 3 3 4 7% 72%	4008
	21st to end	Day	4 3 1 3 2 2 2 2 3 5% 73%	4180
September	1st to 10th	Day	2 1 1 3 1 2 2 2 3 4 78%	2280
	11th to 20th	Day	3 3 2 5% 3 4 4 4 4 7% 60%	2280
	21st to end	Day	7% 6% 2 4 3 3 3 3 4 6% 60%	2032
October	1st to 10th	Day	4 4 1 4 3 3 4 3 4 5% 65%	3180
	11th to 20th	Day	5% 5% 2 6% 4 5% 5% 4 7% 9% 48%	3161
	21st to end	Day	7% 9% 3 7% 5% 7% 6% 4 5% 7% 39%	3275
November	1st to 10th	Day	9% 9% 3 9% 6% 6% 5% 4 7% 7% 34%	1764
	11th to 20th	Day	8% 10% 4 11% 7% 8% 6% 5% 8% 8% 26%	1610
	21st to end	Day	8% 9% 3 8% 6% 5% 6% 5% 7% 9% 35%	1600
December	1st to 10th	Day	7% 8% 3 6% 4 5% 4 4 5% 7% 48%	2620
	11th to 20th	Day	9% 12% 5% 11% 7% 7% 6% 5% 7% 9% 22%	3028
	21st to end	Day	8% 12% 5% 13% 8% 7% 6% 5% 6% 7% 24%	4004
January	1st to 10th	Night	11% 15% 6% 13% 8% 7% 7% 5% 7% 6% 15%	6306
	11th to 20th	Night	11% 11% 4 9% 6% 4 3 3 5% 6% 40%	6320
	21st to end	Night	8% 11% 4 8% 5% 5% 5% 3 5% 6% 40%	6688
February	1st to 10th	Night	7% 11% 4 9% 7% 6% 6% 4 7% 8% 30%	2600
	11th to 20th	Night	7% 12% 4 8% 6% 4 5% 4 6% 8% 37%	2532
	21st to end	Night	7% 12% 4 9% 6% 5% 5% 6% 6% 9% 32%	1980
March	1st to 10th	Night	5% 9% 3 7% 5% 6% 6% 5% 8% 9% 36%	5333
	11th to 20th	Night	5% 9% 3 7% 5% 5% 5% 4 6% 7% 43%	5000
	21st to end	Night	6% 10% 4 10% 6% 7% 7% 5% 7% 10% 27%	5236
April	1st to 10th	Night	9% 10% 3 7% 5% 5% 5% 4 6% 8% 37%	2000
	11th to 20th	Night	7% 9% 3 8% 5% 4 5% 4 6% 7% 42%	1979
	21st to end	Night	9% 7% 2 6% 4 4 5% 4 6% 8% 44%	1915
May	1st to 10th	Night	12% 8% 2 6% 4 3 4 3 4 7% 47%	2620
	11th to 20th	Night	4 5% 2 4 2 3 3 3 4 6% 64%	2596
	21st to end	Night	7% 6% 2 5% 3 4 4 4 5% 7% 53%	2805
June	1st to 10th	Night	10% 8% 2 5% 4 4 4 3 6% 7% 46%	1520
	11th to 20th	Night	6% 5% 2 5% 3 4 3 2 5% 8% 58%	1520
	21st to end	Night	5% 2 1 3 2 2 3 2 4 5% 70%	1520
July	1st to 10th	Night	1 1 1 1 2 1 3 2 87%	2540
	11th to 20th	Night	1 1 1 1 2 1 2 2 3 3 82%	2540
	21st to end	Night	1 1 1 1 1 1 2 3 4 85%	2761
August	1st to 10th	Night	2 2 1 2 1 2 3 3 5% 6% 74%	2709
	11th to 20th	Night	1 1 1 3 2 3 4 2 5% 5% 73%	2830
	21st to end	Night	3 2 1 3 2 2 2 2 3 5% 76%	3498
September	1st to 10th	Night	2 1 2 2 2 2 2 3 4 81%	1900
	11th to 20th	Night	4 3 2 5% 3 3 3 3 6% 7% 63%	1900
	21st to end	Night	6% 4 1 3 2 3 3 3 4 7% 63%	2144
October	1st to 10th	Night	4 4 2 4 3 2 2 2 4 4 70%	3800
	11th to 20th	Night	5% 5% 2 5% 3 4 4 4 7% 8% 52%	3777
	21st to end	Night	8% 6% 3 8% 6% 5% 5% 5% 7% 7% 40%	4286
November	1st to 10th	Night	10% 10% 3 8% 7% 5% 5% 4 6% 9% 34%	2535
	11th to 20th	Night	9% 10% 4 9% 7% 6% 5% 5% 7% 8% 30%	2789
	21st to end	Night	6% 9% 3 6% 5% 6% 6% 4 7% 8% 39%	2800
December	1st to 10th	Night	6% 7% 3 7% 3 4 4 3 4 7% 52%	4560
	11th to 20th	Night	9% 14% 6% 13% 8% 7% 7% 5% 6% 7% 19%	5176
	21st to end	Night	9% 12% 5% 12% 7% 7% 5% 4 6% 6% 26%	6952

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	67% 3 14% 13% 3	3639
	11th to 20th	Day	50% 2 13% 23% 11% 1	3640
	21st to end	Day	43% 3 12% 23% 15% 5%	4279
February	1st to 10th	Day	52% 5% 14% 20% 8% 1	1800
	11th to 20th	Day	49% 5% 14% 21% 10% 1	1764
	21st to end	Day	49% 6% 16% 19% 9% 1	1650
March	1st to 10th	Day	47% 4 7% 24% 17% 2	4557
	11th to 20th	Day	47% 4 10% 27% 12%	5000
	21st to end	Day	54% 5% 12% 23% 6%	5739
April	1st to 10th	Day	51% 4 12% 20% 11% 1	2400
	11th to 20th	Day	45% 4 13% 21% 15% 3	2372
	21st to end	Day	37% 4 13% 29% 15% 2	2479
May	1st to 10th	Day	41% 2 8% 28% 22% 1	4560
	11th to 20th	Day	26% 2 7% 29% 32% 4	4520
	21st to end	Day	37% 3 18% 30% 12% 1	4887
June	1st to 10th	Day	39% 4 10% 30% 16% 2	2660
	11th to 20th	Day	32% 3 10% 34% 18% 4	2660
	21st to end	Day	19% 3 10% 32% 27% 9%	2660
July	1st to 10th	Day	8% 1 4 13% 24% 50%	4351
	11th to 20th	Day	8% 2 4 9% 23% 54%	4345
	21st to end	Day	9% 2 4 18% 37% 31%	4639
August	1st to 10th	Day	15% 2 4 16% 41% 23%	4208
	11th to 20th	Day	14% 3 5% 33% 32% 14%	4047
	21st to end	Day	17% 2 6% 28% 31% 16%	4179
September	1st to 10th	Day	12% 2 5% 27% 34% 20%	2280
	11th to 20th	Day	25% 3 10% 26% 25% 11%	2280
	21st to end	Day	28% 3 11% 28% 22% 9%	2032
October	1st to 10th	Day	24% 3 9% 25% 26% 13%	3180
	11th to 20th	Day	33% 5% 18% 25% 17% 2	3161
	21st to end	Day	44% 4 9% 27% 14% 1	3275
November	1st to 10th	Day	49% 4 13% 23% 10% 1	1764
	11th to 20th	Day	55% 5% 15% 17% 7%	1610
	21st to end	Day	48% 5% 15% 21% 10% 1	1600
December	1st to 10th	Day	36% 4 14% 29% 16% 1	2620
	11th to 20th	Day	59% 4 18% 16% 2	3028
	21st to end	Day	59% 4 15% 19% 3	4004
January	1st to 10th	Night	68% 4 13% 11% 3	6306
	11th to 20th	Night	49% 3 11% 27% 10% 1	6320
	21st to end	Night	47% 2 12% 20% 14% 5%	6688
February	1st to 10th	Night	52% 5% 18% 17% 8%	2600
	11th to 20th	Night	47% 5% 16% 22% 8% 1	2534
	21st to end	Night	52% 6% 13% 20% 9% 1	1980
March	1st to 10th	Night	46% 4 9% 27% 13% 2	5333
	11th to 20th	Night	41% 4 14% 30% 10%	5000
	21st to end	Night	54% 7% 15% 19% 4	5236
April	1st to 10th	Night	46% 5% 17% 21% 10% 1	2000
	11th to 20th	Night	43% 5% 14% 23% 13% 2	1979
	21st to end	Night	41% 6% 14% 26% 11% 3	1915
May	1st to 10th	Night	41% 2 8% 32% 17%	2620
	11th to 20th	Night	26% 3 10% 38% 22% 1	2596
	21st to end	Night	34% 3 29% 28% 7%	2805
June	1st to 10th	Night	38% 5% 14% 29% 12% 1	1520
	11th to 20th	Night	28% 3 14% 38% 14% 3	1520
	21st to end	Night	19% 2 11% 34% 25% 8%	1520
July	1st to 10th	Night	7% 1 6% 15% 28% 43%	2500
	11th to 20th	Night	10% 2 5% 15% 19% 50%	2492
	21st to end	Night	7% 2 3 21% 39% 28%	2674
August	1st to 10th	Night	13% 2 4 19% 39% 22%	2701
	11th to 20th	Night	14% 3 8% 37% 28% 9%	2857
	21st to end	Night	14% 2 9% 31% 31% 13%	3498
September	1st to 10th	Night	11% 2 6% 29% 35% 17%	1900
	11th to 20th	Night	23% 4 10% 27% 24% 12%	1900
	21st to end	Night	26% 2 9% 28% 26% 10%	2144
October	1st to 10th	Night	21% 2 8% 28% 34% 6%	3800
	11th to 20th	Night	30% 3 21% 26% 17% 2	3777
	21st to end	Night	42% 6% 11% 28% 13% 1	4286
November	1st to 10th	Night	50% 5% 12% 21% 12% 1	2535
	11th to 20th	Night	53% 5% 14% 22% 5%	2789
	21st to end	Night	44% 4 16% 23% 12% 1	2800
December	1st to 10th	Night	33% 4 12% 35% 17%	4560
	11th to 20th	Night	63% 4 14% 15% 4	5176
	21st to end	Night	56% 5% 16% 18% 5%	6952

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	21% 18% 28% 21% 12% 1	200
	11th to 20th	Day	18% 9% 26% 34% 9% 6%	200
	21st to end	Day	13% 14% 28% 23% 17% 4	339
February	1st to 10th	Day	18% 20% 26% 23% 12% 1	400
	11th to 20th	Day	14% 22% 31% 23% 9% 2	395
	21st to end	Day	16% 22% 28% 25% 7% 1	414
March	1st to 10th	Day	15% 18% 33% 26% 7% 1	500
	11th to 20th	Day	13% 22% 25% 25% 14% 1	500
	21st to end	Day	17% 23% 26% 26% 8% 1	550
April	1st to 10th	Day	16% 21% 26% 22% 12% 4	500
	11th to 20th	Day	13% 21% 29% 22% 9% 5%	492
	21st to end	Day	9% 23% 25% 25% 14% 3	500
May	1st to 10th	Day	11% 19% 27% 23% 15% 5%	503
	11th to 20th	Day	18% 14% 25% 23% 15% 5%	528
	21st to end	Day	12% 13% 23% 27% 19% 7%	550
June	1st to 10th	Day	10% 16% 21% 25% 18% 9%	490
	11th to 20th	Day	9% 19% 28% 27% 14% 3	490
	21st to end	Day	5% 9% 24% 31% 23% 8%	490
July	1st to 10th	Day	2 7% 30% 31% 23% 7%	486
	11th to 20th	Day	2 8% 29% 25% 29% 8%	484
	21st to end	Day	1 6% 27% 30% 25% 11%	531
August	1st to 10th	Day	1 5% 24% 35% 23% 11%	487
	11th to 20th	Day	3 5% 18% 33% 25% 16%	477
	21st to end	Day	4 8% 23% 30% 23% 12%	539
September	1st to 10th	Day	3 6% 25% 26% 27% 13%	490
	11th to 20th	Day	6% 8% 23% 30% 26% 8%	490
	21st to end	Day	9% 12% 21% 31% 22% 6%	490
October	1st to 10th	Day	10% 10% 22% 30% 20% 7%	490
	11th to 20th	Day	12% 12% 23% 26% 23% 4	490
	21st to end	Day	13% 18% 25% 21% 19% 4	441
November	1st to 10th	Day	14% 12% 28% 28% 15% 3	300
	11th to 20th	Day	12% 20% 20% 29% 14% 5%	205
	21st to end	Day	16% 14% 25% 28% 16% 3	200
December	1st to 10th	Day	12% 17% 24% 22% 19% 8%	200
	11th to 20th	Day	16% 17% 31% 29% 6% 2	200
	21st to end	Day	13% 20% 28% 27% 10% 2	220
January	1st to 10th	Night	15% 15% 28% 28% 12% 3	800
	11th to 20th	Night	12% 14% 26% 29% 17% 2	800
	21st to end	Night	12% 10% 23% 36% 16% 3	880
February	1st to 10th	Night	13% 12% 28% 32% 15% 1	800
	11th to 20th	Night	12% 11% 29% 35% 13% 1	784
	21st to end	Night	13% 15% 30% 34% 8%	660
March	1st to 10th	Night	12% 14% 28% 34% 11% 1	800
	11th to 20th	Night	10% 12% 27% 37% 14% 1	800
	21st to end	Night	8% 14% 32% 31% 14% 1	880
April	1st to 10th	Night	14% 12% 25% 32% 17% 1	800
	11th to 20th	Night	10% 13% 27% 32% 16% 2	791
	21st to end	Night	12% 10% 24% 36% 17% 1	715
May	1st to 10th	Night	9% 9% 21% 40% 20% 1	400
	11th to 20th	Night	10% 5% 21% 41% 23% 1	394
	21st to end	Night	8% 6% 17% 46% 22% 2	422
June	1st to 10th	Night	14% 5% 19% 42% 18% 1	380
	11th to 20th	Night	7% 4 26% 45% 16% 1	380
	21st to end	Night	6% 1 15% 53% 25% 1	380
July	1st to 10th	Night	2 1 12% 61% 24% 1	370
	11th to 20th	Night	1 16% 60% 21% 1	368
	21st to end	Night	1 1 11% 55% 31% 1	416
August	1st to 10th	Night	2 8% 50% 35% 4	480
	11th to 20th	Night	1 1 7% 43% 41% 7%	569
	21st to end	Night	2 3 17% 45% 29% 3	836
September	1st to 10th	Night	2 3 17% 43% 32% 3	760
	11th to 20th	Night	5% 2 14% 43% 30% 6%	760
	21st to end	Night	8% 4 16% 41% 27% 5%	760
October	1st to 10th	Night	8% 5% 20% 40% 24% 3	760
	11th to 20th	Night	8% 8% 20% 36% 25% 3	760
	21st to end	Night	11% 7% 25% 35% 17% 4	836
November	1st to 10th	Night	10% 11% 26% 37% 16% 1	780
	11th to 20th	Night	14% 14% 26% 32% 14% 1	800
	21st to end	Night	10% 11% 25% 33% 19% 2	800
December	1st to 10th	Night	13% 9% 23% 34% 19% 2	800
	11th to 20th	Night	14% 11% 28% 33% 14% 1	800
	21st to end	Night	14% 17% 31% 28% 9% 1	880

Page generated at 2025-05-23 06:21:03. Version ac07

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