Jenny Jump State Forest
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Jenny Jump State Forest 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	17% 7% 3 6% 5% 3 5% 5% 5% 7% 38%	78703
	Night	17% 7% 3 5% 5% 3 4 4 5% 7% 40%	81282
Transparency	Day	45% 6% 11% 22% 14% 2	78408
	Night	43% 6% 12% 23% 15% 2	81111
Seeing	Day	25% 16% 29% 19% 9% 2	14057
	Night	22% 14% 31% 24% 8% 1	23422

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% 10% 3 4 4 3 4 3 5% 4 45%	2517
	11th to 20th	Day	15% 10% 5% 8% 8% 4 4 4 5% 6% 31%	2520
	21st to end	Day	21% 11% 4 5% 5% 3 4 4 4 6% 32%	3096
February	1st to 10th	Day	17% 8% 4 7% 6% 3 4 5% 5% 7% 36%	1710
	11th to 20th	Day	15% 8% 4 6% 6% 2 5% 4 5% 6% 39%	1802
	21st to end	Day	20% 9% 3 6% 6% 3 4 4 4 5% 36%	1570
March	1st to 10th	Day	16% 9% 3 5% 6% 3 4 4 4 6% 41%	1897
	11th to 20th	Day	15% 8% 3 5% 6% 4 5% 4 5% 8% 36%	2061
	21st to end	Day	20% 8% 3 5% 5% 3 4 3 5% 7% 38%	2400
April	1st to 10th	Day	17% 9% 3 5% 5% 3 4 4 4 6% 38%	2160
	11th to 20th	Day	18% 6% 3 6% 5% 3 4 4 5% 7% 40%	2134
	21st to end	Day	19% 7% 2 5% 5% 3 4 6% 6% 6% 38%	2160
May	1st to 10th	Day	22% 7% 3 6% 5% 3 4 4 5% 7% 33%	2357
	11th to 20th	Day	20% 6% 2 6% 5% 4 4 4 5% 7% 36%	2478
	21st to end	Day	15% 6% 3 5% 4 3 6% 5% 5% 9% 39%	2725
June	1st to 10th	Day	16% 5% 3 5% 6% 3 6% 5% 6% 8% 36%	2520
	11th to 20th	Day	16% 5% 3 6% 6% 3 6% 5% 7% 9% 34%	2520
	21st to end	Day	14% 6% 3 5% 5% 4 4 5% 6% 8% 41%	2520
July	1st to 10th	Day	12% 5% 2 7% 7% 4 6% 6% 6% 8% 37%	2520
	11th to 20th	Day	10% 4 2 5% 5% 4 6% 6% 6% 9% 41%	2520
	21st to end	Day	12% 7% 3 6% 6% 3 6% 6% 7% 8% 37%	2744
August	1st to 10th	Day	12% 6% 3 6% 6% 3 6% 7% 7% 9% 36%	2349
	11th to 20th	Day	12% 6% 3 6% 7% 4 6% 5% 6% 8% 38%	2135
	21st to end	Day	14% 6% 2 5% 5% 3 4 5% 5% 8% 41%	2376
September	1st to 10th	Day	16% 4 2 5% 5% 3 5% 4 4 8% 42%	2160
	11th to 20th	Day	13% 5% 2 4 4 3 4 5% 4 7% 50%	2120
	21st to end	Day	18% 5% 3 6% 5% 2 5% 5% 5% 6% 40%	1980
October	1st to 10th	Day	21% 6% 2 5% 5% 3 4 4 5% 7% 39%	1819
	11th to 20th	Day	17% 6% 2 5% 5% 4 4 3 5% 7% 43%	1800
	21st to end	Day	22% 6% 2 5% 5% 3 4 5% 4 7% 38%	1882
November	1st to 10th	Day	14% 7% 3 4 3 2 3 3 4 5% 52%	1671
	11th to 20th	Day	18% 6% 3 4 4 2 4 5% 5% 5% 44%	1710
	21st to end	Day	17% 6% 3 4 4 3 5% 5% 5% 6% 41%	1572
December	1st to 10th	Day	20% 7% 3 7% 5% 3 5% 4 4 6% 35%	1520
	11th to 20th	Day	21% 8% 3 5% 5% 2 5% 5% 5% 5% 38%	1906
	21st to end	Day	19% 10% 4 8% 7% 4 5% 5% 5% 6% 26%	2772
January	1st to 10th	Night	17% 8% 2 5% 5% 3 4 4 5% 5% 41%	4429
	11th to 20th	Night	15% 10% 4 7% 5% 3 4 4 5% 6% 36%	4440
	21st to end	Night	24% 10% 3 6% 4 3 3 4 4 5% 34%	4556
February	1st to 10th	Night	16% 9% 3 6% 5% 2 4 5% 5% 6% 40%	2470
	11th to 20th	Night	15% 8% 4 7% 5% 4 4 4 5% 6% 39%	2262
	21st to end	Night	19% 7% 3 6% 5% 3 4 5% 5% 5% 40%	1884
March	1st to 10th	Night	17% 6% 3 5% 5% 3 3 4 5% 7% 42%	2270
	11th to 20th	Night	17% 8% 3 4 5% 3 5% 4 4 6% 42%	2115
	21st to end	Night	17% 7% 4 5% 5% 3 5% 4 5% 7% 40%	2109
April	1st to 10th	Night	18% 7% 3 6% 5% 3 5% 6% 6% 6% 36%	1800
	11th to 20th	Night	18% 6% 2 5% 5% 3 5% 4 4 7% 40%	1775
	21st to end	Night	21% 6% 2 3 4 2 4 5% 5% 7% 41%	1800
May	1st to 10th	Night	22% 8% 3 7% 5% 3 5% 5% 3 6% 33%	1613
	11th to 20th	Night	17% 7% 3 5% 5% 3 3 5% 6% 6% 40%	1415
	21st to end	Night	15% 6% 3 5% 4 3 4 5% 6% 7% 42%	1550
June	1st to 10th	Night	17% 5% 2 4 5% 3 5% 4 4 6% 44%	1440
	11th to 20th	Night	14% 6% 2 4 5% 4 5% 4 6% 10% 40%	1440
	21st to end	Night	13% 4 1 4 5% 2 4 5% 6% 9% 45%	1440
July	1st to 10th	Night	12% 5% 3 5% 5% 5% 5% 5% 6% 10% 40%	1440
	11th to 20th	Night	10% 4 2 4 5% 3 6% 6% 7% 10% 42%	1440
	21st to end	Night	10% 5% 2 4 5% 3 6% 6% 6% 11% 42%	1574
August	1st to 10th	Night	10% 5% 2 7% 6% 4 5% 5% 7% 8% 41%	1585
	11th to 20th	Night	12% 7% 3 6% 7% 4 5% 5% 7% 9% 37%	1748
	21st to end	Night	15% 4 2 5% 5% 3 5% 5% 6% 9% 41%	1980
September	1st to 10th	Night	16% 6% 2 6% 4 2 4 3 5% 6% 45%	1800
	11th to 20th	Night	13% 5% 3 5% 4 2 3 3 4 6% 52%	1840
	21st to end	Night	17% 6% 2 5% 4 2 4 5% 4 6% 46%	1980
October	1st to 10th	Night	21% 6% 3 5% 4 2 4 3 4 6% 42%	2137
	11th to 20th	Night	18% 5% 2 4 4 3 3 4 4 7% 46%	2160
	21st to end	Night	22% 7% 2 4 4 2 3 3 4 6% 42%	2474
November	1st to 10th	Night	13% 5% 2 4 4 2 4 5% 5% 5% 50%	2407
	11th to 20th	Night	18% 7% 3 5% 4 2 4 4 4 6% 46%	2470
	21st to end	Night	14% 6% 3 5% 5% 3 4 4 6% 8% 43%	2607
December	1st to 10th	Night	19% 8% 3 6% 5% 3 4 4 5% 5% 36%	2660
	11th to 20th	Night	18% 9% 2 5% 5% 3 5% 5% 5% 6% 37%	3288
	21st to end	Night	21% 10% 3 7% 5% 3 4 3 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	43% 4 10% 31% 10% 2	2518
	11th to 20th	Day	54% 4 10% 19% 11% 2	2520
	21st to end	Day	54% 6% 9% 20% 10% 1	3096
February	1st to 10th	Day	48% 5% 12% 21% 12% 2	1710
	11th to 20th	Day	46% 5% 9% 23% 15% 2	1811
	21st to end	Day	51% 5% 9% 21% 11% 3	1570
March	1st to 10th	Day	45% 4 12% 25% 13% 3	1900
	11th to 20th	Day	45% 5% 11% 23% 14% 2	2061
	21st to end	Day	48% 4 9% 17% 18% 5%	2400
April	1st to 10th	Day	46% 5% 10% 20% 14% 5%	2160
	11th to 20th	Day	44% 5% 11% 21% 16% 3	2134
	21st to end	Day	44% 7% 10% 19% 15% 5%	2160
May	1st to 10th	Day	50% 6% 8% 18% 15% 2	2357
	11th to 20th	Day	48% 6% 10% 20% 14% 3	2482
	21st to end	Day	42% 8% 13% 21% 15% 1	2725
June	1st to 10th	Day	43% 8% 13% 20% 14% 1	2520
	11th to 20th	Day	46% 8% 12% 22% 10% 2	2520
	21st to end	Day	41% 8% 12% 24% 14% 1	2520
July	1st to 10th	Day	43% 8% 11% 22% 15% 1	2450
	11th to 20th	Day	36% 8% 16% 24% 15% 1	2445
	21st to end	Day	43% 7% 11% 20% 16% 3	2591
August	1st to 10th	Day	41% 10% 12% 22% 14% 1	2335
	11th to 20th	Day	42% 8% 12% 24% 12% 1	2135
	21st to end	Day	41% 7% 10% 21% 18% 3	2376
September	1st to 10th	Day	42% 6% 11% 21% 17% 2	2160
	11th to 20th	Day	35% 5% 10% 22% 25% 3	2120
	21st to end	Day	44% 7% 8% 18% 20% 2	1980
October	1st to 10th	Day	44% 6% 11% 21% 16% 2	1819
	11th to 20th	Day	41% 5% 10% 25% 18% 1	1800
	21st to end	Day	46% 5% 10% 22% 15% 2	1882
November	1st to 10th	Day	36% 4 12% 25% 19% 3	1671
	11th to 20th	Day	41% 4 9% 23% 19% 3	1710
	21st to end	Day	42% 5% 13% 27% 11% 2	1572
December	1st to 10th	Day	49% 6% 14% 17% 13% 1	1520
	11th to 20th	Day	46% 4 16% 23% 10% 1	1906
	21st to end	Day	57% 5% 12% 18% 8%	2772
January	1st to 10th	Night	42% 4 12% 28% 10% 3	4429
	11th to 20th	Night	48% 6% 12% 23% 10% 2	4440
	21st to end	Night	52% 4 9% 21% 12% 1	4556
February	1st to 10th	Night	45% 5% 13% 24% 12% 2	2470
	11th to 20th	Night	47% 5% 9% 19% 16% 4	2264
	21st to end	Night	45% 4 9% 24% 15% 3	1884
March	1st to 10th	Night	41% 5% 13% 24% 13% 4	2280
	11th to 20th	Night	44% 5% 10% 22% 17% 3	2116
	21st to end	Night	44% 4 10% 19% 19% 5%	2109
April	1st to 10th	Night	48% 6% 10% 20% 14% 3	1800
	11th to 20th	Night	45% 6% 9% 20% 20% 1	1775
	21st to end	Night	43% 6% 10% 22% 16% 4	1800
May	1st to 10th	Night	52% 6% 9% 16% 14% 2	1613
	11th to 20th	Night	44% 7% 11% 18% 18% 2	1416
	21st to end	Night	40% 9% 15% 20% 12% 3	1551
June	1st to 10th	Night	41% 6% 11% 23% 18% 2	1440
	11th to 20th	Night	41% 7% 15% 24% 12% 1	1440
	21st to end	Night	33% 10% 15% 27% 15% 1	1440
July	1st to 10th	Night	39% 9% 14% 22% 14% 2	1400
	11th to 20th	Night	36% 10% 14% 26% 12% 1	1392
	21st to end	Night	33% 9% 18% 21% 17% 2	1486
August	1st to 10th	Night	37% 11% 14% 22% 15% 1	1575
	11th to 20th	Night	43% 8% 15% 20% 12% 1	1748
	21st to end	Night	38% 8% 11% 20% 20% 2	1980
September	1st to 10th	Night	41% 6% 10% 24% 18% 1	1800
	11th to 20th	Night	35% 5% 9% 22% 25% 4	1840
	21st to end	Night	38% 6% 9% 23% 23% 1	1980
October	1st to 10th	Night	44% 5% 11% 24% 14% 2	2137
	11th to 20th	Night	38% 6% 12% 27% 15% 2	2160
	21st to end	Night	43% 5% 11% 25% 16% 1	2474
November	1st to 10th	Night	35% 6% 12% 23% 21% 4	2407
	11th to 20th	Night	41% 4 10% 23% 18% 4	2470
	21st to end	Night	40% 5% 14% 28% 13% 1	2607
December	1st to 10th	Night	48% 5% 13% 22% 11% 1	2660
	11th to 20th	Night	45% 4 14% 21% 14% 2	3288
	21st to end	Night	52% 4 12% 21% 10%	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	34% 24% 28% 11% 2 1	180
	11th to 20th	Day	39% 27% 23% 8% 2	180
	21st to end	Day	27% 29% 31% 7% 5%	290
February	1st to 10th	Day	34% 27% 30% 7% 1	270
	11th to 20th	Day	36% 24% 32% 8% 1	410
	21st to end	Day	35% 22% 29% 11% 2	382
March	1st to 10th	Day	31% 21% 31% 15% 3	460
	11th to 20th	Day	30% 25% 30% 11% 3 1	460
	21st to end	Day	36% 20% 28% 12% 4 1	490
April	1st to 10th	Day	30% 23% 29% 11% 7%	420
	11th to 20th	Day	26% 21% 32% 13% 7% 1	412
	21st to end	Day	35% 15% 33% 12% 3 1	420
May	1st to 10th	Day	35% 18% 26% 13% 7% 1	423
	11th to 20th	Day	25% 18% 31% 19% 5% 1	447
	21st to end	Day	23% 11% 24% 26% 14% 2	485
June	1st to 10th	Day	19% 16% 30% 24% 10% 2	450
	11th to 20th	Day	21% 14% 28% 25% 10% 1	450
	21st to end	Day	17% 12% 32% 26% 10% 1	450
July	1st to 10th	Day	16% 8% 27% 28% 17% 5%	445
	11th to 20th	Day	12% 6% 27% 34% 18% 3	444
	21st to end	Day	15% 11% 31% 29% 11% 3	488
August	1st to 10th	Day	12% 8% 30% 31% 14% 6%	446
	11th to 20th	Day	13% 8% 28% 30% 17% 5%	439
	21st to end	Day	13% 9% 32% 25% 15% 6%	495
September	1st to 10th	Day	21% 9% 26% 24% 13% 6%	450
	11th to 20th	Day	13% 10% 31% 23% 13% 10%	450
	21st to end	Day	22% 15% 28% 21% 11% 4	450
October	1st to 10th	Day	28% 9% 27% 19% 12% 4	450
	11th to 20th	Day	20% 17% 32% 22% 9% 1	450
	21st to end	Day	28% 19% 30% 15% 7% 1	446
November	1st to 10th	Day	22% 16% 28% 22% 10% 2	365
	11th to 20th	Day	29% 19% 29% 17% 5% 1	370
	21st to end	Day	28% 20% 35% 14% 3 1	232
December	1st to 10th	Day	34% 24% 28% 9% 6%	180
	11th to 20th	Day	39% 23% 26% 10% 3	180
	21st to end	Day	33% 20% 31% 13% 3 1	198
January	1st to 10th	Night	24% 22% 37% 14% 3	760
	11th to 20th	Night	29% 20% 31% 19% 2	760
	21st to end	Night	23% 22% 37% 17% 1	836
February	1st to 10th	Night	25% 21% 36% 17% 2	760
	11th to 20th	Night	27% 22% 38% 12% 1	743
	21st to end	Night	30% 19% 32% 16% 2	628
March	1st to 10th	Night	28% 20% 32% 17% 3	760
	11th to 20th	Night	26% 22% 30% 18% 3 1	760
	21st to end	Night	23% 23% 34% 14% 5% 1	821
April	1st to 10th	Night	25% 20% 35% 16% 4	720
	11th to 20th	Night	22% 17% 35% 21% 5%	711
	21st to end	Night	25% 15% 32% 24% 4 1	720
May	1st to 10th	Night	27% 15% 29% 22% 7%	533
	11th to 20th	Night	19% 14% 35% 24% 7%	354
	21st to end	Night	18% 6% 25% 38% 13% 1	389
June	1st to 10th	Night	16% 9% 28% 33% 13% 1	360
	11th to 20th	Night	16% 5% 34% 35% 11%	360
	21st to end	Night	13% 4 26% 43% 13%	360
July	1st to 10th	Night	12% 6% 23% 36% 21% 2	350
	11th to 20th	Night	12% 4 21% 42% 19% 2	348
	21st to end	Night	14% 4 24% 41% 16% 1	394
August	1st to 10th	Night	12% 2 21% 41% 21% 3	511
	11th to 20th	Night	14% 5% 20% 36% 23% 2	684
	21st to end	Night	16% 5% 22% 35% 21% 1	792
September	1st to 10th	Night	20% 5% 26% 32% 15% 2	720
	11th to 20th	Night	15% 7% 25% 30% 20% 5%	720
	21st to end	Night	20% 6% 27% 30% 15% 2	720
October	1st to 10th	Night	24% 10% 24% 27% 14% 2	720
	11th to 20th	Night	20% 14% 28% 30% 8%	720
	21st to end	Night	27% 15% 31% 20% 6%	792
November	1st to 10th	Night	18% 16% 32% 24% 9% 1	740
	11th to 20th	Night	24% 16% 30% 23% 6% 1	760
	21st to end	Night	20% 18% 35% 20% 6%	760
December	1st to 10th	Night	27% 16% 35% 17% 4	760
	11th to 20th	Night	26% 17% 35% 19% 3	760
	21st to end	Night	26% 18% 35% 18% 2	836

Page generated at 2024-03-24 23:37:01. Version ac07

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