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 2024-11-02.

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% 6% 52%	101537
	Night	7% 8% 3 7% 5% 4 4 4 5% 7% 46%	97595
Transparency	Day	35% 3 10% 23% 19% 10%	101280
	Night	40% 4 13% 23% 15% 6%	97441
Seeing	Day	10% 14% 25% 27% 17% 6%	14627
	Night	9% 9% 23% 38% 20% 2	23635

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% 14% 4 12% 7% 7% 6% 4 7% 7% 22%	2539
	11th to 20th	Day	16% 16% 5% 12% 6% 6% 6% 4 5% 5% 20%	2540
	21st to end	Day	10% 13% 4 11% 7% 6% 6% 4 6% 8% 26%	2985
February	1st to 10th	Day	8% 12% 3 9% 6% 4 6% 5% 6% 8% 31%	1710
	11th to 20th	Day	8% 11% 3 7% 6% 6% 6% 6% 6% 8% 34%	1665
	21st to end	Day	6% 11% 4 10% 6% 5% 6% 6% 7% 8% 31%	1570
March	1st to 10th	Day	5% 9% 4 9% 6% 6% 5% 5% 7% 10% 34%	3164
	11th to 20th	Day	4 8% 2 6% 6% 5% 5% 3 5% 6% 50%	3490
	21st to end	Day	6% 10% 4 11% 7% 7% 7% 5% 7% 7% 28%	4000
April	1st to 10th	Day	8% 12% 3 8% 6% 6% 5% 5% 7% 7% 32%	2280
	11th to 20th	Day	7% 9% 4 8% 7% 5% 4 4 6% 6% 39%	2249
	21st to end	Day	7% 5% 3 6% 5% 4 5% 5% 7% 8% 45%	2354
May	1st to 10th	Day	10% 8% 2 7% 4 4 4 3 4 6% 47%	4420
	11th to 20th	Day	5% 3 1 4 3 3 3 3 4 5% 65%	4377
	21st to end	Day	8% 6% 2 6% 4 3 4 4 6% 8% 48%	4813
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	6% 5% 2 6% 4 4 4 4 4 5% 54%	1900
	11th to 20th	Day	7% 6% 2 6% 5% 4 4 4 6% 8% 47%	1900
	21st to end	Day	9% 8% 3 6% 5% 5% 5% 4 5% 7% 42%	1992
November	1st to 10th	Day	9% 9% 3 9% 6% 6% 6% 4 7% 7% 34%	1683
	11th to 20th	Day	8% 10% 3 10% 7% 7% 6% 5% 8% 8% 27%	1530
	21st to end	Day	8% 9% 3 8% 6% 5% 6% 5% 7% 9% 34%	1520
December	1st to 10th	Day	8% 10% 4 7% 6% 6% 5% 5% 6% 7% 36%	1520
	11th to 20th	Day	9% 11% 5% 10% 6% 6% 6% 5% 7% 10% 25%	1928
	21st to end	Day	8% 12% 6% 12% 7% 7% 6% 4 6% 6% 26%	2794
January	1st to 10th	Night	9% 13% 5% 13% 8% 8% 7% 6% 7% 7% 18%	4406
	11th to 20th	Night	15% 15% 5% 12% 8% 5% 4 4 6% 6% 20%	4420
	21st to end	Night	10% 14% 4 11% 7% 6% 6% 4 6% 7% 23%	4676
February	1st to 10th	Night	7% 11% 4 9% 7% 6% 6% 4 7% 8% 31%	2470
	11th to 20th	Night	8% 11% 4 8% 6% 4 4 4 6% 8% 37%	2402
	21st to end	Night	7% 12% 4 9% 6% 5% 5% 6% 6% 9% 31%	1884
March	1st to 10th	Night	5% 10% 3 8% 6% 6% 6% 6% 7% 9% 34%	3706
	11th to 20th	Night	5% 7% 2 5% 4 4 4 4 5% 7% 54%	3490
	21st to end	Night	6% 10% 4 10% 6% 7% 7% 6% 7% 9% 28%	3653
April	1st to 10th	Night	9% 10% 3 7% 5% 4 5% 4 6% 8% 38%	1900
	11th to 20th	Night	7% 9% 3 8% 5% 5% 5% 4 6% 7% 42%	1879
	21st to end	Night	10% 8% 2 6% 4 4 6% 4 6% 9% 43%	1820
May	1st to 10th	Night	12% 8% 2 6% 4 3 4 4 4 7% 46%	2540
	11th to 20th	Night	4 5% 2 4 2 3 3 3 4 6% 65%	2516
	21st to end	Night	7% 6% 2 6% 3 4 4 4 5% 7% 53%	2762
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	7% 5% 2 5% 3 3 3 3 4 5% 58%	2280
	11th to 20th	Night	7% 5% 2 6% 4 4 4 4 6% 7% 53%	2280
	21st to end	Night	9% 7% 2 8% 5% 4 4 4 6% 6% 44%	2604
November	1st to 10th	Night	10% 9% 3 9% 7% 5% 5% 4 6% 8% 34%	2418
	11th to 20th	Night	9% 10% 4 9% 7% 6% 5% 5% 7% 8% 31%	2649
	21st to end	Night	6% 9% 3 6% 5% 6% 6% 4 7% 8% 39%	2660
December	1st to 10th	Night	9% 11% 4 11% 5% 5% 5% 4 6% 8% 33%	2660
	11th to 20th	Night	9% 14% 6% 11% 7% 7% 6% 5% 6% 6% 23%	3276
	21st to end	Night	8% 13% 5% 13% 7% 6% 5% 4 6% 6% 26%	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	64% 3 13% 16% 3	2539
	11th to 20th	Day	69% 3 13% 10% 4 2	2540
	21st to end	Day	58% 3 16% 18% 5% 1	2985
February	1st to 10th	Day	52% 5% 15% 21% 7% 1	1710
	11th to 20th	Day	49% 5% 14% 22% 9% 1	1674
	21st to end	Day	49% 6% 16% 19% 8% 1	1570
March	1st to 10th	Day	50% 3 7% 22% 17% 1	3164
	11th to 20th	Day	37% 2 12% 34% 15%	3490
	21st to end	Day	56% 3 10% 24% 6%	4000
April	1st to 10th	Day	52% 4 12% 20% 11% 1	2280
	11th to 20th	Day	46% 4 13% 20% 14% 3	2252
	21st to end	Day	38% 4 13% 29% 14% 2	2354
May	1st to 10th	Day	41% 2 8% 27% 21% 1	4420
	11th to 20th	Day	25% 2 7% 29% 33% 4	4380
	21st to end	Day	37% 2 18% 30% 12% 1	4814
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	34% 4 9% 24% 22% 8%	1900
	11th to 20th	Day	36% 5% 15% 23% 18% 4	1900
	21st to end	Day	44% 4 11% 24% 15% 2	1992
November	1st to 10th	Day	49% 4 13% 23% 10% 1	1683
	11th to 20th	Day	54% 5% 16% 17% 7%	1530
	21st to end	Day	48% 5% 16% 19% 11% 1	1520
December	1st to 10th	Day	48% 6% 16% 23% 7%	1520
	11th to 20th	Day	55% 4 20% 18% 3	1928
	21st to end	Day	58% 3 14% 21% 3	2794
January	1st to 10th	Night	65% 4 15% 13% 3	4406
	11th to 20th	Night	67% 3 12% 11% 5% 2	4420
	21st to end	Night	60% 3 17% 14% 5%	4676
February	1st to 10th	Night	52% 5% 18% 17% 8%	2470
	11th to 20th	Night	46% 5% 16% 23% 8% 1	2404
	21st to end	Night	52% 6% 13% 20% 9% 1	1884
March	1st to 10th	Night	50% 4 9% 26% 12% 1	3706
	11th to 20th	Night	34% 3 14% 38% 12%	3490
	21st to end	Night	54% 5% 16% 19% 6%	3653
April	1st to 10th	Night	47% 5% 17% 20% 10% 1	1900
	11th to 20th	Night	45% 5% 14% 22% 12% 2	1879
	21st to end	Night	42% 6% 14% 26% 10% 3	1820
May	1st to 10th	Night	42% 2 8% 32% 16%	2540
	11th to 20th	Night	25% 3 9% 39% 22% 1	2516
	21st to end	Night	34% 3 29% 28% 7%	2762
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	31% 3 9% 27% 25% 5%	2280
	11th to 20th	Night	33% 3 16% 26% 19% 4	2280
	21st to end	Night	41% 4 13% 22% 17% 2	2604
November	1st to 10th	Night	50% 5% 12% 21% 11% 1	2418
	11th to 20th	Night	52% 5% 15% 23% 5%	2649
	21st to end	Night	44% 4 16% 22% 12% 1	2660
December	1st to 10th	Night	51% 5% 17% 20% 7%	2660
	11th to 20th	Night	60% 4 14% 17% 6%	3276
	21st to end	Night	57% 4 14% 20% 5%	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	19% 17% 28% 21% 13% 1	180
	11th to 20th	Day	19% 9% 24% 33% 9% 4	180
	21st to end	Day	14% 15% 28% 23% 16% 3	311
February	1st to 10th	Day	17% 19% 26% 24% 13% 1	370
	11th to 20th	Day	14% 22% 32% 23% 8% 2	365
	21st to end	Day	15% 22% 28% 25% 8% 1	382
March	1st to 10th	Day	15% 18% 32% 26% 7% 1	460
	11th to 20th	Day	13% 22% 24% 25% 15% 1	460
	21st to end	Day	17% 22% 26% 25% 8% 1	506
April	1st to 10th	Day	17% 22% 25% 21% 12% 4	460
	11th to 20th	Day	14% 22% 29% 21% 8% 5%	452
	21st to end	Day	10% 25% 25% 24% 13% 3	460
May	1st to 10th	Day	11% 20% 27% 22% 14% 5%	463
	11th to 20th	Day	17% 13% 25% 24% 15% 6%	488
	21st to end	Day	12% 13% 23% 27% 18% 7%	529
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% 19% 25% 21% 19% 4	441
November	1st to 10th	Day	14% 12% 28% 29% 15% 3	273
	11th to 20th	Day	10% 17% 21% 31% 15% 5%	185
	21st to end	Day	17% 14% 23% 27% 17% 3	180
December	1st to 10th	Day	12% 17% 24% 24% 16% 6%	180
	11th to 20th	Day	16% 16% 32% 27% 7% 2	180
	21st to end	Day	13% 19% 26% 29% 12% 2	198
January	1st to 10th	Night	14% 14% 28% 28% 13% 3	760
	11th to 20th	Night	13% 14% 26% 27% 18% 2	760
	21st to end	Night	13% 10% 23% 36% 16% 3	836
February	1st to 10th	Night	12% 11% 28% 33% 15% 1	760
	11th to 20th	Night	12% 11% 28% 35% 13% 1	744
	21st to end	Night	13% 15% 29% 34% 9%	628
March	1st to 10th	Night	13% 14% 28% 33% 12% 1	760
	11th to 20th	Night	9% 12% 26% 38% 14% 1	760
	21st to end	Night	8% 14% 32% 31% 14% 1	836
April	1st to 10th	Night	14% 12% 24% 31% 17% 1	760
	11th to 20th	Night	10% 13% 27% 32% 16% 2	751
	21st to end	Night	12% 10% 25% 35% 16% 1	680
May	1st to 10th	Night	10% 9% 21% 39% 21% 1	380
	11th to 20th	Night	10% 4 20% 41% 24% 1	374
	21st to end	Night	8% 6% 17% 45% 23% 1	411
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	11% 10% 25% 37% 16% 1	744
	11th to 20th	Night	13% 14% 25% 33% 15% 1	760
	21st to end	Night	10% 11% 26% 33% 18% 3	760
December	1st to 10th	Night	13% 10% 23% 34% 18% 2	760
	11th to 20th	Night	13% 10% 28% 34% 14% 1	760
	21st to end	Night	13% 17% 31% 29% 10% 1	836

Page generated at 2024-10-29 22:22:59. Version ac07

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