Wawayanda State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Wawayanda State Park clear sky chart from 2005-11-06 to 2024-03-28.

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	16% 7% 3 5% 5% 3 5% 5% 5% 7% 38%	78685
	Night	17% 7% 3 5% 5% 3 4 4 5% 7% 41%	81300
Transparency	Day	30% 37% 8% 15% 9% 1	78390
	Night	30% 35% 8% 16% 10% 1	81129
Seeing	Day	23% 17% 30% 19% 9% 3	14063
	Night	20% 15% 32% 24% 8% 1	23381

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	15% 9% 3 4 4 3 5% 4 4 5% 45%	2517
	11th to 20th	Day	15% 10% 3 7% 7% 3 6% 5% 4 5% 34%	2520
	21st to end	Day	21% 13% 5% 5% 5% 2 4 4 4 5% 31%	3028
February	1st to 10th	Day	17% 8% 3 6% 6% 3 5% 5% 5% 6% 35%	1710
	11th to 20th	Day	14% 8% 4 6% 6% 3 4 4 4 7% 40%	1824
	21st to end	Day	18% 10% 2 5% 5% 2 5% 4 4 6% 38%	1570
March	1st to 10th	Day	16% 7% 3 6% 5% 2 5% 3 5% 7% 41%	1897
	11th to 20th	Day	15% 7% 3 5% 6% 4 4 5% 5% 8% 38%	2024
	21st to end	Day	19% 9% 3 5% 5% 2 4 4 4 6% 38%	2423
April	1st to 10th	Day	17% 9% 4 5% 4 2 4 5% 4 7% 39%	2160
	11th to 20th	Day	17% 6% 3 5% 6% 2 4 4 4 6% 41%	2134
	21st to end	Day	19% 7% 2 6% 6% 4 4 5% 5% 7% 36%	2168
May	1st to 10th	Day	24% 7% 3 5% 5% 3 5% 4 5% 6% 33%	2362
	11th to 20th	Day	19% 6% 3 5% 5% 4 5% 5% 5% 8% 35%	2478
	21st to end	Day	14% 7% 3 5% 5% 3 5% 5% 6% 8% 40%	2725
June	1st to 10th	Day	17% 5% 2 4 6% 3 5% 6% 6% 8% 36%	2520
	11th to 20th	Day	17% 6% 3 6% 5% 3 6% 5% 7% 10% 32%	2520
	21st to end	Day	13% 5% 3 6% 7% 3 4 5% 6% 8% 39%	2520
July	1st to 10th	Day	12% 6% 3 6% 7% 5% 5% 6% 5% 8% 38%	2520
	11th to 20th	Day	11% 5% 2 5% 5% 3 6% 7% 6% 10% 38%	2520
	21st to end	Day	12% 6% 3 6% 6% 4 7% 5% 6% 8% 37%	2744
August	1st to 10th	Day	12% 6% 3 6% 7% 4 7% 7% 6% 8% 35%	2388
	11th to 20th	Day	12% 6% 3 6% 6% 4 6% 6% 7% 8% 37%	2126
	21st to end	Day	15% 5% 3 5% 5% 4 5% 4 6% 8% 41%	2376
September	1st to 10th	Day	16% 5% 2 5% 6% 3 5% 4 5% 7% 41%	2160
	11th to 20th	Day	14% 5% 2 5% 4 3 4 4 5% 6% 49%	2099
	21st to end	Day	16% 7% 2 6% 5% 3 5% 4 5% 6% 41%	1980
October	1st to 10th	Day	21% 6% 3 6% 4 3 4 4 4 6% 39%	1851
	11th to 20th	Day	15% 6% 2 5% 5% 3 4 4 5% 7% 44%	1800
	21st to end	Day	22% 6% 2 5% 5% 3 4 5% 4 7% 37%	1850
November	1st to 10th	Day	15% 6% 2 4 4 2 3 3 4 6% 51%	1671
	11th to 20th	Day	18% 7% 2 4 4 2 4 4 5% 7% 44%	1710
	21st to end	Day	17% 6% 2 4 4 3 4 6% 6% 6% 41%	1592
December	1st to 10th	Day	18% 10% 4 6% 5% 3 4 4 5% 6% 36%	1520
	11th to 20th	Day	21% 6% 3 5% 4 3 4 4 5% 6% 39%	1906
	21st to end	Day	18% 10% 5% 8% 7% 4 5% 5% 5% 6% 28%	2772
January	1st to 10th	Night	16% 7% 3 4 4 3 4 4 5% 7% 43%	4429
	11th to 20th	Night	14% 8% 4 7% 6% 3 4 4 5% 6% 39%	4440
	21st to end	Night	22% 12% 3 5% 5% 2 4 4 4 6% 33%	4624
February	1st to 10th	Night	16% 9% 3 5% 5% 3 4 4 5% 6% 40%	2470
	11th to 20th	Night	16% 7% 3 6% 5% 3 6% 4 5% 7% 39%	2240
	21st to end	Night	19% 7% 3 6% 4 3 4 4 4 6% 40%	1884
March	1st to 10th	Night	16% 8% 3 5% 4 2 3 3 5% 8% 42%	2270
	11th to 20th	Night	16% 8% 3 4 5% 2 4 4 5% 7% 41%	2151
	21st to end	Night	17% 5% 4 6% 4 2 4 5% 6% 7% 39%	2087
April	1st to 10th	Night	17% 8% 3 6% 5% 3 6% 5% 5% 6% 36%	1800
	11th to 20th	Night	17% 7% 2 6% 6% 2 4 5% 5% 8% 39%	1775
	21st to end	Night	20% 7% 2 5% 5% 2 4 4 5% 6% 40%	1790
May	1st to 10th	Night	21% 10% 3 6% 4 3 5% 4 4 6% 34%	1612
	11th to 20th	Night	18% 7% 2 6% 4 3 4 5% 6% 6% 39%	1415
	21st to end	Night	15% 6% 3 5% 5% 3 4 5% 6% 7% 42%	1550
June	1st to 10th	Night	18% 4 2 4 5% 3 5% 5% 5% 7% 43%	1440
	11th to 20th	Night	15% 5% 3 5% 6% 3 5% 4 6% 9% 40%	1440
	21st to end	Night	12% 4 2 4 5% 3 5% 5% 6% 10% 45%	1440
July	1st to 10th	Night	12% 5% 2 5% 5% 3 5% 5% 5% 9% 42%	1440
	11th to 20th	Night	12% 5% 3 5% 6% 3 5% 5% 6% 10% 41%	1440
	21st to end	Night	11% 4 2 3 5% 3 5% 6% 6% 10% 43%	1574
August	1st to 10th	Night	9% 5% 3 6% 6% 3 5% 5% 5% 9% 44%	1538
	11th to 20th	Night	12% 6% 4 6% 6% 4 5% 4 6% 8% 38%	1765
	21st to end	Night	14% 5% 2 5% 6% 3 4 4 6% 7% 44%	1980
September	1st to 10th	Night	16% 5% 3 5% 4 3 4 4 4 6% 45%	1800
	11th to 20th	Night	14% 6% 2 4 3 2 3 3 4 7% 53%	1859
	21st to end	Night	16% 6% 2 5% 4 2 4 4 4 6% 46%	1980
October	1st to 10th	Night	21% 5% 2 5% 4 3 3 3 4 6% 43%	2106
	11th to 20th	Night	16% 6% 2 5% 3 3 4 3 5% 6% 48%	2160
	21st to end	Night	21% 7% 3 5% 3 2 4 4 4 6% 42%	2506
November	1st to 10th	Night	12% 6% 2 5% 4 2 3 5% 5% 6% 49%	2407
	11th to 20th	Night	18% 8% 3 4 3 2 4 3 4 6% 45%	2470
	21st to end	Night	15% 6% 2 5% 5% 3 5% 5% 5% 7% 43%	2586
December	1st to 10th	Night	18% 7% 3 6% 5% 4 4 4 5% 6% 38%	2660
	11th to 20th	Night	18% 8% 3 5% 5% 3 4 5% 6% 6% 38%	3288
	21st to end	Night	20% 9% 4 6% 6% 3 4 4 4 6% 34%	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	29% 27% 9% 27% 6%	2518
	11th to 20th	Day	40% 28% 8% 17% 7% 1	2520
	21st to end	Day	47% 23% 7% 16% 6% 1	3028
February	1st to 10th	Day	30% 35% 7% 16% 10% 1	1710
	11th to 20th	Day	30% 37% 7% 15% 10% 2	1833
	21st to end	Day	33% 35% 7% 14% 9% 2	1570
March	1st to 10th	Day	29% 34% 9% 17% 9% 1	1900
	11th to 20th	Day	29% 36% 8% 15% 9% 2	2024
	21st to end	Day	32% 35% 6% 13% 12% 2	2423
April	1st to 10th	Day	29% 37% 7% 14% 10% 3	2160
	11th to 20th	Day	30% 37% 8% 13% 9% 3	2134
	21st to end	Day	30% 38% 7% 12% 10% 3	2168
May	1st to 10th	Day	32% 38% 5% 12% 11% 2	2362
	11th to 20th	Day	31% 39% 6% 13% 10% 2	2482
	21st to end	Day	26% 39% 10% 14% 9% 2	2725
June	1st to 10th	Day	28% 39% 10% 13% 8% 1	2520
	11th to 20th	Day	31% 40% 9% 15% 4 1	2520
	21st to end	Day	28% 39% 10% 16% 6% 1	2520
July	1st to 10th	Day	30% 40% 8% 13% 8% 1	2450
	11th to 20th	Day	24% 40% 11% 16% 8% 1	2445
	21st to end	Day	27% 40% 8% 12% 10% 1	2591
August	1st to 10th	Day	28% 40% 9% 14% 8%	2374
	11th to 20th	Day	29% 38% 8% 16% 9% 1	2126
	21st to end	Day	31% 38% 6% 13% 10% 2	2376
September	1st to 10th	Day	28% 38% 7% 14% 12% 2	2160
	11th to 20th	Day	22% 38% 7% 16% 16% 2	2099
	21st to end	Day	30% 37% 6% 12% 13% 2	1980
October	1st to 10th	Day	28% 38% 7% 15% 11%	1851
	11th to 20th	Day	27% 38% 9% 17% 9% 1	1800
	21st to end	Day	31% 38% 6% 14% 8% 2	1850
November	1st to 10th	Day	20% 41% 7% 17% 13% 2	1671
	11th to 20th	Day	27% 41% 7% 15% 9% 2	1710
	21st to end	Day	27% 41% 9% 16% 7% 1	1592
December	1st to 10th	Day	30% 41% 10% 13% 6% 1	1520
	11th to 20th	Day	31% 34% 11% 15% 7% 1	1906
	21st to end	Day	42% 30% 9% 14% 6%	2772
January	1st to 10th	Night	31% 27% 9% 25% 7% 1	4429
	11th to 20th	Night	36% 27% 8% 18% 9% 2	4440
	21st to end	Night	43% 25% 8% 17% 7%	4624
February	1st to 10th	Night	29% 36% 9% 16% 10% 1	2470
	11th to 20th	Night	30% 37% 9% 13% 10% 2	2242
	21st to end	Night	31% 34% 6% 17% 10% 2	1884
March	1st to 10th	Night	28% 35% 10% 18% 8% 1	2280
	11th to 20th	Night	32% 36% 8% 16% 8% 1	2152
	21st to end	Night	27% 36% 8% 14% 12% 4	2087
April	1st to 10th	Night	30% 38% 8% 12% 10% 2	1800
	11th to 20th	Night	32% 37% 5% 13% 11% 1	1775
	21st to end	Night	28% 37% 8% 13% 11% 3	1790
May	1st to 10th	Night	33% 37% 6% 11% 11% 1	1612
	11th to 20th	Night	29% 38% 6% 12% 12% 2	1416
	21st to end	Night	24% 38% 13% 14% 8% 2	1551
June	1st to 10th	Night	27% 39% 9% 14% 10% 1	1440
	11th to 20th	Night	27% 39% 10% 18% 5% 1	1440
	21st to end	Night	24% 40% 12% 17% 8%	1440
July	1st to 10th	Night	27% 41% 9% 14% 7% 2	1400
	11th to 20th	Night	26% 40% 9% 16% 8% 1	1392
	21st to end	Night	20% 43% 11% 15% 10% 1	1486
August	1st to 10th	Night	25% 39% 12% 14% 9%	1528
	11th to 20th	Night	30% 38% 9% 15% 8%	1765
	21st to end	Night	30% 39% 7% 13% 11% 1	1980
September	1st to 10th	Night	28% 38% 7% 15% 12% 1	1800
	11th to 20th	Night	23% 36% 7% 17% 16% 1	1859
	21st to end	Night	26% 37% 6% 16% 15% 1	1980
October	1st to 10th	Night	28% 37% 7% 16% 11% 1	2106
	11th to 20th	Night	27% 38% 9% 16% 9% 1	2160
	21st to end	Night	30% 37% 8% 15% 9% 1	2506
November	1st to 10th	Night	20% 41% 8% 15% 14% 2	2407
	11th to 20th	Night	27% 39% 7% 16% 9% 2	2470
	21st to end	Night	25% 41% 8% 18% 8%	2586
December	1st to 10th	Night	28% 40% 8% 14% 8% 1	2660
	11th to 20th	Night	30% 34% 10% 13% 12% 2	3288
	21st to end	Night	39% 28% 11% 15% 7%	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	31% 22% 30% 14% 2	180
	11th to 20th	Day	35% 24% 30% 9% 1	180
	21st to end	Day	23% 31% 31% 11% 2 2	270
February	1st to 10th	Day	31% 28% 32% 8% 1	270
	11th to 20th	Day	31% 28% 32% 8% 1	432
	21st to end	Day	31% 23% 33% 9% 3	382
March	1st to 10th	Day	30% 23% 29% 15% 3	460
	11th to 20th	Day	27% 26% 30% 13% 3 1	460
	21st to end	Day	30% 21% 31% 11% 4 1	490
April	1st to 10th	Day	28% 21% 30% 13% 6% 1	420
	11th to 20th	Day	25% 23% 30% 13% 7% 1	412
	21st to end	Day	31% 19% 30% 13% 5% 1	420
May	1st to 10th	Day	34% 20% 25% 14% 6% 2	423
	11th to 20th	Day	23% 15% 36% 18% 6% 1	447
	21st to end	Day	20% 10% 28% 28% 12% 2	485
June	1st to 10th	Day	18% 14% 34% 21% 11% 2	450
	11th to 20th	Day	19% 13% 31% 26% 10% 1	450
	21st to end	Day	15% 14% 32% 26% 12% 2	450
July	1st to 10th	Day	15% 11% 28% 26% 15% 5%	445
	11th to 20th	Day	11% 6% 30% 32% 17% 3	444
	21st to end	Day	13% 8% 33% 32% 13% 1	488
August	1st to 10th	Day	13% 6% 29% 31% 15% 7%	446
	11th to 20th	Day	14% 8% 25% 33% 14% 6%	439
	21st to end	Day	15% 10% 26% 27% 16% 6%	495
September	1st to 10th	Day	20% 12% 24% 21% 17% 6%	450
	11th to 20th	Day	16% 10% 31% 20% 12% 11%	450
	21st to end	Day	21% 12% 29% 23% 10% 5%	450
October	1st to 10th	Day	27% 13% 25% 19% 11% 5%	450
	11th to 20th	Day	18% 19% 31% 20% 10% 2	450
	21st to end	Day	25% 17% 33% 16% 9%	430
November	1st to 10th	Day	20% 17% 30% 22% 9% 2	365
	11th to 20th	Day	26% 22% 29% 17% 4 1	370
	21st to end	Day	27% 23% 28% 16% 4 2	252
December	1st to 10th	Day	28% 30% 26% 10% 6%	180
	11th to 20th	Day	37% 23% 27% 11% 2	180
	21st to end	Day	24% 25% 36% 10% 4 1	198
January	1st to 10th	Night	19% 24% 39% 16% 3	760
	11th to 20th	Night	25% 21% 33% 18% 4	760
	21st to end	Night	20% 22% 38% 18% 2	836
February	1st to 10th	Night	22% 19% 39% 18% 1	760
	11th to 20th	Night	24% 25% 36% 13% 1	743
	21st to end	Night	29% 21% 33% 15% 2	628
March	1st to 10th	Night	24% 23% 33% 17% 3	760
	11th to 20th	Night	23% 23% 33% 16% 3 1	760
	21st to end	Night	22% 21% 35% 16% 5%	821
April	1st to 10th	Night	22% 23% 36% 16% 4	720
	11th to 20th	Night	22% 18% 34% 22% 5%	711
	21st to end	Night	24% 17% 31% 24% 4	710
May	1st to 10th	Night	26% 15% 31% 23% 5%	532
	11th to 20th	Night	20% 14% 37% 23% 6% 1	354
	21st to end	Night	16% 9% 26% 37% 11% 1	389
June	1st to 10th	Night	19% 7% 29% 33% 11% 1	360
	11th to 20th	Night	14% 7% 35% 31% 13% 1	360
	21st to end	Night	11% 5% 29% 44% 11%	360
July	1st to 10th	Night	13% 5% 23% 37% 20% 1	350
	11th to 20th	Night	12% 3 25% 43% 16% 1	348
	21st to end	Night	12% 4 26% 40% 17% 1	394
August	1st to 10th	Night	11% 2 25% 43% 18% 2	464
	11th to 20th	Night	15% 4 21% 37% 22% 1	701
	21st to end	Night	15% 5% 20% 38% 20% 2	792
September	1st to 10th	Night	16% 6% 24% 36% 16% 2	720
	11th to 20th	Night	16% 7% 27% 29% 17% 4	720
	21st to end	Night	19% 6% 26% 32% 15% 2	720
October	1st to 10th	Night	23% 11% 27% 25% 13% 2	720
	11th to 20th	Night	19% 13% 32% 28% 7%	720
	21st to end	Night	26% 13% 34% 20% 7%	792
November	1st to 10th	Night	16% 14% 36% 23% 10% 1	740
	11th to 20th	Night	23% 18% 31% 20% 7% 1	760
	21st to end	Night	19% 20% 34% 20% 6%	760
December	1st to 10th	Night	25% 20% 33% 17% 5%	760
	11th to 20th	Night	23% 19% 36% 19% 3	760
	21st to end	Night	25% 20% 36% 16% 2	836

Page generated at 2024-03-24 23:37:00. Version ac07

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