Tuckahoe State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Tuckahoe State Park clear sky chart from 2005-11-06 to 2024-11-04.

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	14% 6% 2 6% 4 4 4 4 6% 8% 42%	101214
	Night	14% 7% 2 6% 4 4 4 3 5% 7% 43%	97764
Transparency	Day	37% 7% 13% 24% 16% 3	104844
	Night	39% 6% 12% 23% 17% 3	102273
Seeing	Day	17% 10% 27% 25% 15% 6%	15069
	Night	17% 9% 29% 31% 12% 1	24444

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	15% 5% 2 5% 4 3 3 3 4 6% 49%	2517
	11th to 20th	Day	16% 9% 3 7% 4 5% 4 3 4 5% 41%	2750
	21st to end	Day	18% 9% 3 6% 4 3 4 4 5% 5% 39%	3124
February	1st to 10th	Day	14% 6% 3 6% 5% 4 4 4 6% 7% 41%	1710
	11th to 20th	Day	18% 7% 2 4 3 4 5% 3 5% 5% 44%	1789
	21st to end	Day	17% 9% 3 5% 5% 4 4 3 4 6% 39%	1570
March	1st to 10th	Day	23% 6% 2 5% 4 3 3 3 4 7% 40%	3230
	11th to 20th	Day	10% 4 1 4 4 4 4 4 5% 7% 52%	3480
	21st to end	Day	20% 7% 2 6% 4 3 3 2 4 5% 42%	3988
April	1st to 10th	Day	14% 6% 2 6% 4 4 5% 4 5% 6% 45%	2280
	11th to 20th	Day	12% 6% 2 4 4 3 4 4 5% 8% 48%	2254
	21st to end	Day	15% 7% 2 5% 3 3 4 4 5% 7% 45%	2280
May	1st to 10th	Day	23% 8% 3 6% 4 4 4 4 6% 8% 31%	3901
	11th to 20th	Day	20% 7% 3 7% 5% 5% 4 4 6% 7% 31%	4398
	21st to end	Day	10% 5% 2 6% 4 4 5% 4 6% 9% 45%	4823
June	1st to 10th	Day	10% 5% 2 5% 5% 4 5% 4 8% 10% 42%	2660
	11th to 20th	Day	10% 4 2 5% 4 4 5% 5% 7% 10% 44%	2660
	21st to end	Day	9% 4 2 5% 4 3 5% 5% 7% 11% 46%	2660
July	1st to 10th	Day	6% 4 2 6% 5% 5% 6% 6% 8% 12% 41%	4440
	11th to 20th	Day	10% 5% 2 5% 5% 5% 5% 5% 9% 11% 39%	4440
	21st to end	Day	9% 6% 2 7% 5% 6% 6% 5% 9% 10% 35%	4535
August	1st to 10th	Day	15% 6% 2 6% 4 4 5% 4 8% 11% 35%	4104
	11th to 20th	Day	9% 5% 2 6% 5% 5% 5% 4 6% 9% 43%	3743
	21st to end	Day	7% 4 2 5% 4 4 5% 4 7% 9% 48%	4180
September	1st to 10th	Day	13% 6% 2 6% 4 5% 4 3 6% 6% 45%	2280
	11th to 20th	Day	10% 6% 3 5% 4 3 4 4 5% 8% 48%	2280
	21st to end	Day	18% 9% 3 6% 4 3 4 4 4 6% 38%	2043
October	1st to 10th	Day	15% 5% 2 6% 4 4 4 3 4 7% 46%	1900
	11th to 20th	Day	15% 5% 2 4 4 3 3 2 5% 6% 52%	1900
	21st to end	Day	14% 5% 2 5% 4 4 3 2 4 5% 51%	2090
November	1st to 10th	Day	12% 5% 1 4 4 4 3 4 5% 6% 52%	1703
	11th to 20th	Day	13% 6% 2 5% 3 3 4 3 6% 7% 48%	1710
	21st to end	Day	14% 6% 2 5% 5% 3 3 3 4 6% 48%	1590
December	1st to 10th	Day	16% 6% 2 7% 3 3 5% 4 5% 6% 43%	1520
	11th to 20th	Day	16% 8% 3 6% 4 3 3 3 4 6% 45%	1910
	21st to end	Day	14% 8% 3 5% 4 5% 4 4 6% 6% 41%	2772
January	1st to 10th	Night	15% 7% 3 5% 4 4 5% 4 4 6% 43%	4429
	11th to 20th	Night	18% 7% 2 5% 4 3 4 3 4 5% 44%	4207
	21st to end	Night	19% 10% 2 6% 3 3 3 2 4 5% 42%	4532
February	1st to 10th	Night	15% 7% 2 6% 4 4 4 4 5% 6% 42%	2470
	11th to 20th	Night	19% 8% 2 6% 4 3 3 3 4 5% 43%	2275
	21st to end	Night	18% 7% 3 5% 4 4 4 2 4 6% 44%	1884
March	1st to 10th	Night	21% 9% 2 6% 4 4 3 3 4 5% 39%	3620
	11th to 20th	Night	12% 5% 2 5% 3 4 5% 4 5% 8% 47%	3480
	21st to end	Night	16% 8% 2 6% 4 3 4 2 4 5% 45%	3642
April	1st to 10th	Night	15% 8% 2 6% 4 4 4 3 5% 6% 43%	1900
	11th to 20th	Night	12% 6% 2 6% 5% 4 5% 3 5% 6% 47%	1875
	21st to end	Night	17% 5% 2 5% 3 4 5% 4 6% 7% 43%	1900
May	1st to 10th	Night	18% 9% 3 8% 5% 5% 5% 4 6% 7% 32%	3020
	11th to 20th	Night	20% 9% 2 7% 5% 4 5% 4 6% 6% 32%	2495
	21st to end	Night	9% 6% 2 6% 5% 4 4 4 6% 9% 44%	2732
June	1st to 10th	Night	11% 7% 1 6% 4 5% 6% 4 5% 9% 43%	1520
	11th to 20th	Night	9% 6% 2 6% 5% 5% 5% 4 7% 9% 42%	1520
	21st to end	Night	9% 5% 1 6% 5% 5% 6% 5% 8% 9% 40%	1520
July	1st to 10th	Night	7% 5% 2 6% 5% 5% 6% 5% 8% 10% 41%	2520
	11th to 20th	Night	10% 5% 2 7% 5% 4 5% 4 8% 10% 38%	2520
	21st to end	Night	12% 9% 3 8% 5% 5% 6% 4 5% 9% 35%	3014
August	1st to 10th	Night	16% 7% 2 7% 4 5% 5% 4 6% 11% 32%	2825
	11th to 20th	Night	11% 6% 3 7% 5% 5% 4 5% 6% 9% 40%	3053
	21st to end	Night	8% 5% 2 6% 4 4 4 4 6% 7% 50%	3476
September	1st to 10th	Night	13% 6% 3 5% 4 3 4 3 5% 8% 45%	1900
	11th to 20th	Night	9% 5% 2 6% 4 3 3 3 5% 9% 51%	1900
	21st to end	Night	17% 7% 3 5% 4 4 5% 3 4 6% 40%	2133
October	1st to 10th	Night	16% 8% 3 6% 4 4 3 3 4 5% 45%	2280
	11th to 20th	Night	15% 5% 2 5% 3 3 3 3 4 5% 53%	2280
	21st to end	Night	15% 6% 2 5% 3 3 3 3 4 7% 49%	2508
November	1st to 10th	Night	11% 5% 2 5% 3 3 4 3 5% 5% 53%	2447
	11th to 20th	Night	14% 7% 3 5% 4 3 3 3 4 5% 48%	2470
	21st to end	Night	12% 6% 2 4 4 4 4 4 6% 7% 48%	2588
December	1st to 10th	Night	18% 8% 3 6% 4 3 4 3 5% 7% 40%	2660
	11th to 20th	Night	17% 6% 2 6% 4 4 4 3 5% 7% 43%	3285
	21st to end	Night	14% 8% 3 7% 4 5% 5% 4 6% 7% 38%	4884

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	35% 5% 10% 31% 15% 3	2518
	11th to 20th	Day	46% 5% 11% 21% 14% 4	2750
	21st to end	Day	46% 6% 12% 23% 11% 2	3124
February	1st to 10th	Day	40% 7% 14% 24% 13% 2	1710
	11th to 20th	Day	41% 5% 9% 26% 17% 3	1798
	21st to end	Day	45% 5% 12% 19% 15% 4	1570
March	1st to 10th	Day	44% 5% 9% 25% 13% 4	3230
	11th to 20th	Day	29% 7% 10% 30% 20% 4	3480
	21st to end	Day	44% 6% 8% 20% 19% 4	3988
April	1st to 10th	Day	38% 6% 12% 21% 17% 5%	2280
	11th to 20th	Day	34% 6% 11% 24% 18% 6%	2254
	21st to end	Day	38% 6% 13% 21% 19% 4	2280
May	1st to 10th	Day	49% 9% 11% 19% 11% 2	3936
	11th to 20th	Day	48% 10% 15% 19% 7% 1	4402
	21st to end	Day	32% 9% 13% 27% 17% 2	4837
June	1st to 10th	Day	35% 10% 15% 24% 15% 2	2660
	11th to 20th	Day	34% 10% 14% 25% 15% 2	2660
	21st to end	Day	30% 9% 15% 25% 19% 1	2660
July	1st to 10th	Day	33% 9% 22% 18% 13% 4	4370
	11th to 20th	Day	35% 9% 19% 26% 9% 2	4365
	21st to end	Day	40% 10% 14% 20% 15% 1	4390
August	1st to 10th	Day	41% 7% 17% 27% 7%	4091
	11th to 20th	Day	36% 8% 12% 29% 13% 2	3779
	21st to end	Day	31% 7% 13% 28% 18% 3	4180
September	1st to 10th	Day	38% 6% 14% 20% 18% 4	2280
	11th to 20th	Day	33% 6% 11% 24% 23% 3	2280
	21st to end	Day	46% 6% 8% 18% 18% 3	2043
October	1st to 10th	Day	35% 5% 8% 20% 27% 5%	3160
	11th to 20th	Day	24% 3 7% 28% 28% 10%	3140
	21st to end	Day	23% 3 8% 32% 26% 8%	3428
November	1st to 10th	Day	32% 4 13% 28% 19% 3	1703
	11th to 20th	Day	35% 6% 11% 23% 23% 3	1710
	21st to end	Day	38% 4 10% 29% 16% 3	1590
December	1st to 10th	Day	41% 7% 14% 24% 12% 2	1520
	11th to 20th	Day	41% 6% 9% 30% 12% 3	1906
	21st to end	Day	41% 7% 17% 22% 13%	2772
January	1st to 10th	Night	41% 6% 10% 25% 15% 4	4429
	11th to 20th	Night	41% 4 11% 25% 15% 3	4207
	21st to end	Night	45% 4 8% 27% 14% 1	4532
February	1st to 10th	Night	42% 6% 13% 23% 15% 2	2470
	11th to 20th	Night	44% 4 8% 21% 19% 4	2277
	21st to end	Night	42% 4 11% 21% 17% 5%	1884
March	1st to 10th	Night	47% 5% 9% 24% 13% 2	3620
	11th to 20th	Night	32% 8% 12% 28% 18% 4	3480
	21st to end	Night	42% 4 9% 18% 22% 5%	3642
April	1st to 10th	Night	41% 5% 11% 18% 20% 5%	1900
	11th to 20th	Night	39% 5% 11% 20% 19% 6%	1875
	21st to end	Night	38% 7% 11% 22% 17% 5%	1900
May	1st to 10th	Night	50% 7% 11% 20% 9% 2	3050
	11th to 20th	Night	51% 8% 14% 17% 9% 1	2496
	21st to end	Night	35% 10% 17% 21% 15% 3	2739
June	1st to 10th	Night	37% 7% 14% 23% 18% 1	1520
	11th to 20th	Night	36% 10% 15% 24% 14% 2	1520
	21st to end	Night	35% 9% 16% 22% 16% 3	1520
July	1st to 10th	Night	37% 11% 21% 17% 12% 2	2480
	11th to 20th	Night	38% 8% 21% 24% 8% 1	2472
	21st to end	Night	45% 8% 13% 20% 14%	2918
August	1st to 10th	Night	46% 8% 18% 20% 8%	2814
	11th to 20th	Night	39% 8% 13% 27% 12% 1	3083
	21st to end	Night	31% 7% 12% 27% 21% 2	3476
September	1st to 10th	Night	38% 7% 12% 21% 18% 5%	1900
	11th to 20th	Night	30% 7% 11% 25% 23% 4	1900
	21st to end	Night	45% 6% 9% 20% 17% 3	2133
October	1st to 10th	Night	40% 5% 9% 21% 20% 4	3800
	11th to 20th	Night	23% 3 13% 21% 31% 8%	3779
	21st to end	Night	23% 3 12% 30% 25% 7%	4120
November	1st to 10th	Night	33% 6% 10% 27% 19% 6%	2447
	11th to 20th	Night	38% 5% 10% 20% 21% 5%	2470
	21st to end	Night	34% 6% 13% 25% 19% 3	2588
December	1st to 10th	Night	44% 5% 12% 24% 13% 2	2660
	11th to 20th	Night	40% 5% 11% 21% 19% 3	3288
	21st to end	Night	43% 7% 15% 25% 10% 1	4884

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% 19% 37% 16% 7% 1	180
	11th to 20th	Day	27% 21% 33% 15% 5%	247
	21st to end	Day	25% 15% 42% 12% 5% 1	297
February	1st to 10th	Day	25% 20% 34% 14% 6%	270
	11th to 20th	Day	27% 19% 41% 12% 2	397
	21st to end	Day	27% 17% 35% 16% 4	382
March	1st to 10th	Day	21% 20% 33% 22% 4	460
	11th to 20th	Day	22% 18% 35% 18% 5% 2	460
	21st to end	Day	21% 17% 32% 23% 6% 1	506
April	1st to 10th	Day	22% 17% 34% 20% 6% 2	460
	11th to 20th	Day	17% 15% 31% 23% 12% 3	452
	21st to end	Day	23% 12% 30% 24% 9% 2	460
May	1st to 10th	Day	23% 13% 32% 19% 9% 3	463
	11th to 20th	Day	16% 10% 34% 25% 12% 2	487
	21st to end	Day	15% 5% 23% 28% 20% 9%	529
June	1st to 10th	Day	12% 6% 27% 28% 19% 8%	490
	11th to 20th	Day	12% 7% 23% 30% 20% 8%	490
	21st to end	Day	11% 3 25% 33% 22% 6%	490
July	1st to 10th	Day	8% 4 17% 35% 24% 12%	485
	11th to 20th	Day	5% 1 16% 35% 30% 12%	484
	21st to end	Day	10% 3 18% 31% 30% 8%	532
August	1st to 10th	Day	12% 3 17% 31% 27% 10%	486
	11th to 20th	Day	10% 4 14% 31% 29% 12%	479
	21st to end	Day	8% 5% 16% 33% 22% 16%	539
September	1st to 10th	Day	14% 6% 19% 26% 21% 14%	490
	11th to 20th	Day	11% 4 24% 28% 21% 12%	490
	21st to end	Day	24% 8% 25% 25% 13% 5%	490
October	1st to 10th	Day	19% 9% 23% 24% 17% 8%	490
	11th to 20th	Day	16% 13% 26% 26% 16% 4	490
	21st to end	Day	17% 9% 32% 26% 12% 3	539
November	1st to 10th	Day	18% 10% 29% 27% 14% 3	377
	11th to 20th	Day	15% 18% 31% 23% 12% 1	370
	21st to end	Day	20% 13% 28% 26% 10% 2	250
December	1st to 10th	Day	17% 19% 38% 17% 7% 2	180
	11th to 20th	Day	27% 20% 30% 16% 8%	180
	21st to end	Day	24% 12% 33% 21% 9% 1	198
January	1st to 10th	Night	22% 15% 38% 21% 4	760
	11th to 20th	Night	20% 15% 34% 26% 4	760
	21st to end	Night	18% 15% 40% 25% 3	836
February	1st to 10th	Night	21% 11% 38% 28% 3	760
	11th to 20th	Night	23% 18% 40% 17% 1	743
	21st to end	Night	23% 17% 36% 22% 3	628
March	1st to 10th	Night	18% 15% 39% 23% 5%	760
	11th to 20th	Night	20% 15% 38% 21% 6% 1	760
	21st to end	Night	19% 12% 38% 25% 5%	836
April	1st to 10th	Night	20% 15% 40% 20% 5%	760
	11th to 20th	Night	14% 12% 36% 32% 6%	751
	21st to end	Night	20% 9% 33% 30% 8%	760
May	1st to 10th	Night	19% 9% 30% 32% 9% 1	702
	11th to 20th	Night	15% 7% 34% 33% 10% 1	374
	21st to end	Night	13% 3 22% 42% 18% 1	411
June	1st to 10th	Night	12% 4 25% 41% 16% 1	380
	11th to 20th	Night	9% 2 24% 48% 17% 1	380
	21st to end	Night	10% 2 21% 51% 16% 1	380
July	1st to 10th	Night	10% 2 18% 43% 24% 2	370
	11th to 20th	Night	7% 2 14% 45% 29% 3	368
	21st to end	Night	8% 1 14% 48% 26% 3	577
August	1st to 10th	Night	10% 1 13% 46% 29% 2	567
	11th to 20th	Night	11% 3 15% 38% 30% 2	718
	21st to end	Night	11% 3 13% 38% 30% 5%	836
September	1st to 10th	Night	16% 3 16% 37% 25% 4	760
	11th to 20th	Night	12% 2 17% 36% 28% 4	760
	21st to end	Night	21% 5% 19% 35% 19% 1	760
October	1st to 10th	Night	20% 5% 19% 32% 20% 4	760
	11th to 20th	Night	17% 8% 26% 34% 14% 1	760
	21st to end	Night	17% 8% 32% 28% 14% 1	836
November	1st to 10th	Night	14% 6% 33% 32% 12% 2	755
	11th to 20th	Night	18% 12% 31% 29% 9% 1	760
	21st to end	Night	15% 14% 32% 29% 10% 1	760
December	1st to 10th	Night	22% 14% 33% 21% 9% 1	760
	11th to 20th	Night	19% 11% 37% 27% 6%	760
	21st to end	Night	18% 12% 34% 31% 4	836

Page generated at 2024-11-01 22:47:38. Version ac07

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