Wading River
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Wading River clear sky chart from 2005-11-06 to 2024-01-15.

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	15% 6% 2 5% 4 3 4 4 5% 8% 43%	74805
	Night	17% 7% 3 5% 5% 3 4 4 5% 7% 41%	74965
Transparency	Day	27% 38% 8% 15% 10% 1	74510
	Night	29% 37% 8% 15% 10% 1	74794
Seeing	Day	18% 4 20% 30% 20% 7%	13959
	Night	20% 6% 27% 30% 14% 2	23129

By Month

Percentage Cloud Cover NE (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	14% 6% 3 5% 4 3 4 5% 6% 8% 42%	1517
	11th to 20th	Day	17% 8% 3 5% 4 2 5% 4 6% 7% 38%	1472
	21st to end	Day	15% 7% 2 6% 4 3 5% 5% 4 9% 40%	1645
February	1st to 10th	Day	19% 6% 3 6% 4 3 4 5% 5% 7% 38%	1700
	11th to 20th	Day	16% 5% 3 5% 5% 2 4 4 4 7% 44%	1748
	21st to end	Day	20% 8% 2 5% 4 3 4 4 4 7% 39%	1480
March	1st to 10th	Day	14% 6% 2 4 5% 3 4 5% 4 8% 45%	1797
	11th to 20th	Day	15% 6% 2 4 5% 2 4 5% 6% 7% 44%	1846
	21st to end	Day	19% 7% 3 5% 5% 2 3 4 4 5% 43%	2376
April	1st to 10th	Day	17% 7% 2 4 4 3 4 4 4 7% 43%	2160
	11th to 20th	Day	16% 6% 2 4 5% 3 4 4 4 6% 46%	2134
	21st to end	Day	19% 5% 2 4 3 3 4 4 6% 7% 43%	2250
May	1st to 10th	Day	21% 8% 3 4 4 2 3 4 5% 6% 40%	2340
	11th to 20th	Day	18% 6% 2 5% 4 2 3 5% 5% 8% 43%	2375
	21st to end	Day	13% 5% 2 4 4 2 3 5% 6% 9% 45%	2725
June	1st to 10th	Day	16% 5% 2 5% 5% 2 4 4 6% 10% 41%	2520
	11th to 20th	Day	14% 5% 3 5% 4 3 5% 5% 6% 9% 42%	2520
	21st to end	Day	10% 5% 2 5% 5% 3 4 4 5% 9% 47%	2520
July	1st to 10th	Day	11% 5% 2 4 4 3 5% 5% 5% 10% 47%	2520
	11th to 20th	Day	10% 5% 3 5% 5% 3 4 5% 6% 9% 46%	2520
	21st to end	Day	12% 5% 3 4 4 3 5% 5% 6% 8% 44%	2744
August	1st to 10th	Day	9% 4 2 4 4 3 5% 5% 8% 10% 45%	2394
	11th to 20th	Day	12% 5% 3 5% 4 3 4 4 6% 8% 46%	2126
	21st to end	Day	10% 5% 3 5% 5% 2 5% 5% 6% 8% 46%	2376
September	1st to 10th	Day	13% 5% 2 5% 4 3 4 4 6% 7% 47%	2160
	11th to 20th	Day	12% 5% 2 3 4 2 3 3 4 7% 54%	2031
	21st to end	Day	17% 5% 2 5% 5% 3 5% 5% 5% 6% 43%	1980
October	1st to 10th	Day	22% 6% 2 4 3 2 3 3 4 6% 45%	1962
	11th to 20th	Day	15% 5% 2 5% 4 2 4 4 6% 8% 46%	1792
	21st to end	Day	19% 7% 2 4 5% 3 4 4 5% 8% 39%	1782
November	1st to 10th	Day	15% 6% 2 5% 4 3 4 4 3 6% 48%	1671
	11th to 20th	Day	17% 6% 2 4 5% 2 3 3 4 8% 46%	1710
	21st to end	Day	15% 6% 2 5% 4 2 5% 4 5% 7% 44%	1710
December	1st to 10th	Day	18% 7% 2 5% 6% 2 5% 5% 6% 7% 36%	1524
	11th to 20th	Day	21% 7% 3 4 3 2 3 2 5% 6% 44%	1906
	21st to end	Day	18% 11% 4 7% 6% 3 4 5% 4 6% 33%	2772
January	1st to 10th	Night	17% 6% 3 4 4 3 4 3 6% 8% 41%	2649
	11th to 20th	Night	20% 8% 3 6% 4 2 4 4 4 7% 38%	2583
	21st to end	Night	14% 9% 3 5% 4 2 4 4 5% 8% 42%	2709
February	1st to 10th	Night	17% 10% 3 5% 6% 3 5% 4 5% 8% 36%	2259
	11th to 20th	Night	18% 8% 3 5% 4 3 4 4 5% 8% 38%	2098
	21st to end	Night	20% 6% 2 4 6% 3 4 5% 4 6% 40%	1776
March	1st to 10th	Night	16% 7% 2 4 5% 3 4 4 4 7% 44%	2150
	11th to 20th	Night	17% 6% 3 5% 5% 3 4 4 5% 8% 40%	2107
	21st to end	Night	18% 8% 2 4 4 2 4 4 5% 6% 42%	1980
April	1st to 10th	Night	18% 7% 2 5% 6% 3 4 4 4 6% 39%	1800
	11th to 20th	Night	18% 7% 3 5% 4 3 4 4 4 6% 43%	1775
	21st to end	Night	19% 8% 3 5% 5% 2 3 3 4 6% 41%	1710
May	1st to 10th	Night	21% 8% 3 5% 5% 3 5% 4 5% 7% 33%	1620
	11th to 20th	Night	19% 7% 2 6% 5% 3 4 5% 6% 8% 35%	1533
	21st to end	Night	17% 7% 3 5% 5% 3 5% 5% 6% 8% 37%	1550
June	1st to 10th	Night	19% 6% 2 4 4 3 5% 4 5% 8% 40%	1440
	11th to 20th	Night	16% 5% 2 5% 4 3 4 5% 6% 10% 40%	1440
	21st to end	Night	11% 6% 3 5% 6% 3 6% 5% 5% 9% 42%	1440
July	1st to 10th	Night	9% 6% 4 6% 5% 3 6% 5% 8% 9% 39%	1440
	11th to 20th	Night	12% 6% 3 5% 4 3 5% 5% 7% 9% 41%	1440
	21st to end	Night	11% 5% 2 6% 6% 2 6% 5% 6% 9% 41%	1574
August	1st to 10th	Night	7% 4 2 5% 6% 3 5% 6% 7% 11% 44%	1522
	11th to 20th	Night	11% 4 3 7% 6% 4 6% 6% 7% 8% 38%	1773
	21st to end	Night	12% 5% 2 4 5% 3 5% 4 6% 9% 45%	1980
September	1st to 10th	Night	14% 6% 2 6% 6% 3 5% 5% 5% 6% 43%	1800
	11th to 20th	Night	15% 5% 2 3 3 2 4 3 4 7% 52%	1928
	21st to end	Night	17% 5% 2 5% 6% 3 5% 4 5% 6% 41%	1980
October	1st to 10th	Night	22% 7% 3 5% 5% 2 4 4 4 6% 39%	1994
	11th to 20th	Night	16% 6% 2 5% 4 3 4 4 4 5% 47%	2168
	21st to end	Night	22% 7% 3 5% 4 2 4 4 5% 6% 38%	2574
November	1st to 10th	Night	14% 6% 3 6% 4 3 4 3 5% 7% 46%	2407
	11th to 20th	Night	19% 7% 3 4 4 3 3 3 4 6% 45%	2470
	21st to end	Night	15% 5% 2 5% 4 3 4 4 5% 8% 44%	2470
December	1st to 10th	Night	20% 7% 2 5% 4 4 4 4 5% 7% 37%	2654
	11th to 20th	Night	19% 8% 2 5% 5% 3 4 4 5% 6% 39%	3288
	21st to end	Night	20% 10% 3 6% 6% 2 3 4 4 6% 36%	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	26% 40% 9% 19% 7%	1518
	11th to 20th	Day	32% 40% 9% 11% 7%	1472
	21st to end	Day	28% 38% 6% 18% 9% 1	1645
February	1st to 10th	Day	29% 35% 7% 17% 11% 1	1700
	11th to 20th	Day	27% 38% 9% 17% 8% 2	1757
	21st to end	Day	32% 36% 6% 13% 11% 2	1480
March	1st to 10th	Day	25% 37% 9% 17% 10% 2	1800
	11th to 20th	Day	27% 37% 8% 16% 10% 1	1846
	21st to end	Day	28% 37% 5% 14% 13% 3	2376
April	1st to 10th	Day	27% 37% 7% 15% 13% 3	2160
	11th to 20th	Day	28% 37% 8% 14% 11% 3	2134
	21st to end	Day	27% 37% 7% 15% 11% 3	2250
May	1st to 10th	Day	29% 39% 6% 14% 11% 1	2340
	11th to 20th	Day	27% 38% 7% 14% 11% 3	2379
	21st to end	Day	23% 39% 12% 15% 9% 2	2725
June	1st to 10th	Day	26% 39% 9% 16% 9% 1	2520
	11th to 20th	Day	27% 39% 9% 18% 7% 1	2520
	21st to end	Day	25% 39% 11% 16% 7% 1	2520
July	1st to 10th	Day	24% 40% 9% 16% 9% 1	2450
	11th to 20th	Day	23% 39% 9% 18% 9% 1	2445
	21st to end	Day	24% 41% 8% 15% 11% 1	2591
August	1st to 10th	Day	24% 39% 12% 16% 9%	2380
	11th to 20th	Day	26% 38% 8% 16% 11% 1	2126
	21st to end	Day	28% 38% 8% 12% 13% 2	2376
September	1st to 10th	Day	24% 38% 9% 14% 13% 2	2160
	11th to 20th	Day	21% 38% 7% 18% 16% 1	2031
	21st to end	Day	29% 37% 5% 13% 14% 2	1980
October	1st to 10th	Day	27% 37% 6% 16% 14% 1	1962
	11th to 20th	Day	26% 37% 9% 17% 11% 1	1792
	21st to end	Day	30% 37% 7% 16% 10% 1	1782
November	1st to 10th	Day	24% 40% 7% 15% 12% 1	1671
	11th to 20th	Day	25% 39% 9% 15% 11% 1	1710
	21st to end	Day	28% 39% 9% 16% 7% 1	1710
December	1st to 10th	Day	27% 40% 11% 14% 6% 1	1524
	11th to 20th	Day	30% 31% 11% 12% 14% 1	1906
	21st to end	Day	40% 27% 9% 18% 6%	2772
January	1st to 10th	Night	26% 39% 8% 17% 9% 1	2649
	11th to 20th	Night	31% 41% 7% 14% 6% 1	2583
	21st to end	Night	25% 37% 8% 18% 11% 1	2709
February	1st to 10th	Night	31% 37% 8% 14% 10% 1	2259
	11th to 20th	Night	30% 38% 7% 14% 9% 2	2100
	21st to end	Night	30% 35% 5% 17% 11% 2	1776
March	1st to 10th	Night	25% 36% 9% 17% 11% 2	2160
	11th to 20th	Night	31% 37% 7% 15% 8% 2	2108
	21st to end	Night	28% 37% 5% 14% 13% 3	1980
April	1st to 10th	Night	30% 37% 7% 12% 12% 2	1800
	11th to 20th	Night	31% 36% 6% 12% 14% 1	1775
	21st to end	Night	30% 37% 6% 13% 11% 4	1710
May	1st to 10th	Night	34% 37% 6% 11% 11% 2	1620
	11th to 20th	Night	30% 38% 6% 12% 11% 3	1534
	21st to end	Night	29% 39% 10% 12% 9% 1	1551
June	1st to 10th	Night	30% 38% 8% 13% 10% 1	1440
	11th to 20th	Night	27% 39% 10% 17% 8%	1440
	21st to end	Night	29% 38% 10% 16% 6%	1440
July	1st to 10th	Night	27% 41% 10% 14% 7% 1	1400
	11th to 20th	Night	26% 40% 8% 17% 9% 1	1392
	21st to end	Night	25% 41% 7% 15% 9% 2	1486
August	1st to 10th	Night	24% 40% 11% 16% 9%	1512
	11th to 20th	Night	29% 36% 8% 18% 9% 1	1773
	21st to end	Night	28% 39% 8% 15% 9% 1	1980
September	1st to 10th	Night	29% 37% 6% 15% 13% 2	1800
	11th to 20th	Night	22% 37% 8% 16% 16% 1	1928
	21st to end	Night	28% 37% 5% 13% 15% 2	1980
October	1st to 10th	Night	30% 36% 6% 15% 12% 1	1994
	11th to 20th	Night	28% 37% 9% 17% 10% 1	2168
	21st to end	Night	31% 37% 7% 14% 10% 1	2574
November	1st to 10th	Night	22% 41% 8% 15% 12% 2	2407
	11th to 20th	Night	27% 39% 6% 17% 10% 1	2470
	21st to end	Night	25% 40% 8% 18% 9% 1	2470
December	1st to 10th	Night	28% 40% 9% 13% 9% 1	2654
	11th to 20th	Night	30% 32% 9% 13% 14% 1	3288
	21st to end	Night	37% 26% 9% 18% 9%	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	19% 9% 37% 22% 12% 1	180
	11th to 20th	Day	18% 14% 35% 27% 6% 1	168
	21st to end	Day	20% 6% 35% 27% 10% 2	204
February	1st to 10th	Day	25% 8% 36% 24% 6% 1	320
	11th to 20th	Day	21% 8% 37% 29% 5%	416
	21st to end	Day	25% 7% 32% 27% 8% 1	346
March	1st to 10th	Day	16% 6% 32% 37% 9%	420
	11th to 20th	Day	18% 5% 34% 34% 8% 1	420
	21st to end	Day	22% 4 31% 31% 10% 3	462
April	1st to 10th	Day	20% 7% 28% 31% 13% 2	420
	11th to 20th	Day	20% 4 22% 35% 17% 2	412
	21st to end	Day	25% 4 21% 34% 14% 2	420
May	1st to 10th	Day	26% 3 22% 32% 13% 4	423
	11th to 20th	Day	19% 2 17% 36% 22% 4	447
	21st to end	Day	18% 1 11% 27% 29% 14%	485
June	1st to 10th	Day	17% 11% 35% 28% 8%	450
	11th to 20th	Day	14% 1 13% 34% 30% 8%	450
	21st to end	Day	13% 1 9% 36% 31% 10%	450
July	1st to 10th	Day	14% 2 7% 28% 34% 16%	445
	11th to 20th	Day	11% 1 5% 27% 39% 17%	444
	21st to end	Day	13% 7% 36% 37% 8%	488
August	1st to 10th	Day	11% 2 5% 31% 35% 15%	446
	11th to 20th	Day	13% 2 5% 31% 36% 13%	439
	21st to end	Day	12% 1 8% 34% 29% 16%	495
September	1st to 10th	Day	18% 3 14% 24% 24% 17%	450
	11th to 20th	Day	14% 1 13% 30% 27% 14%	450
	21st to end	Day	19% 2 17% 33% 22% 6%	450
October	1st to 10th	Day	27% 4 14% 25% 20% 10%	450
	11th to 20th	Day	15% 5% 26% 29% 20% 5%	446
	21st to end	Day	24% 5% 27% 26% 15% 3	396
November	1st to 10th	Day	16% 6% 24% 30% 20% 4	365
	11th to 20th	Day	20% 10% 32% 26% 11% 1	370
	21st to end	Day	16% 11% 31% 26% 14% 1	370
December	1st to 10th	Day	20% 7% 35% 23% 15%	184
	11th to 20th	Day	23% 12% 32% 27% 5% 1	180
	21st to end	Day	23% 7% 34% 25% 8% 3	198
January	1st to 10th	Night	20% 11% 40% 22% 6%	760
	11th to 20th	Night	27% 11% 33% 24% 5%	739
	21st to end	Night	20% 11% 41% 24% 4 1	792
February	1st to 10th	Night	22% 11% 38% 26% 4	720
	11th to 20th	Night	24% 10% 42% 22% 2	703
	21st to end	Night	24% 9% 36% 25% 5%	592
March	1st to 10th	Night	21% 9% 38% 26% 7%	720
	11th to 20th	Night	20% 7% 38% 28% 6% 1	720
	21st to end	Night	22% 5% 33% 29% 9% 1	792
April	1st to 10th	Night	23% 5% 33% 30% 10%	720
	11th to 20th	Night	21% 3 28% 34% 13%	711
	21st to end	Night	23% 4 26% 35% 11% 1	630
May	1st to 10th	Night	25% 4 21% 33% 15% 2	540
	11th to 20th	Night	23% 2 26% 36% 12% 1	472
	21st to end	Night	21% 2 11% 37% 26% 2	389
June	1st to 10th	Night	20% 2 16% 37% 22% 3	360
	11th to 20th	Night	17% 3 11% 43% 23% 3	360
	21st to end	Night	13% 1 14% 45% 24% 2	360
July	1st to 10th	Night	11% 4 12% 41% 29% 3	350
	11th to 20th	Night	13% 1 10% 40% 33% 3	348
	21st to end	Night	13% 1 12% 47% 24% 3	394
August	1st to 10th	Night	8% 1 13% 47% 29% 3	448
	11th to 20th	Night	15% 1 11% 35% 33% 5%	709
	21st to end	Night	13% 2 11% 36% 30% 7%	792
September	1st to 10th	Night	16% 2 18% 33% 25% 6%	720
	11th to 20th	Night	17% 2 14% 36% 23% 8%	720
	21st to end	Night	21% 3 19% 33% 20% 4	720
October	1st to 10th	Night	23% 7% 22% 26% 16% 5%	720
	11th to 20th	Night	21% 7% 26% 31% 15% 1	720
	21st to end	Night	26% 6% 30% 26% 11% 1	792
November	1st to 10th	Night	17% 7% 31% 29% 14% 2	740
	11th to 20th	Night	23% 11% 31% 25% 10% 1	760
	21st to end	Night	17% 13% 34% 27% 9% 1	760
December	1st to 10th	Night	24% 11% 32% 24% 7% 1	760
	11th to 20th	Night	22% 13% 35% 25% 5%	760
	21st to end	Night	24% 10% 36% 26% 3	836

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