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 2024-11-04.

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	17% 7% 3 6% 4 4 4 4 5% 7% 38%	101360
	Night	17% 8% 2 6% 4 4 4 3 5% 6% 40%	97668
Transparency	Day	44% 6% 11% 22% 15% 2	104892
	Night	43% 5% 12% 23% 15% 2	102225
Seeing	Day	24% 16% 29% 19% 9% 2	14932
	Night	22% 14% 31% 24% 8% 1	24121

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 5% 4 4 3 2 5% 4 45%	2517
	11th to 20th	Day	15% 11% 5% 9% 6% 5% 4 3 5% 6% 31%	2520
	21st to end	Day	21% 11% 4 6% 4 4 4 3 4 5% 32%	3096
February	1st to 10th	Day	16% 8% 3 8% 6% 4 4 4 5% 7% 36%	1710
	11th to 20th	Day	14% 9% 3 8% 4 4 4 4 5% 5% 39%	1802
	21st to end	Day	19% 10% 2 8% 6% 4 4 3 4 5% 36%	1570
March	1st to 10th	Day	27% 11% 2 5% 4 3 3 2 3 5% 34%	3116
	11th to 20th	Day	10% 8% 3 6% 5% 5% 5% 3 5% 8% 42%	3438
	21st to end	Day	21% 8% 2 5% 4 3 3 2 4 6% 42%	4067
April	1st to 10th	Day	18% 9% 3 6% 4 4 4 4 5% 6% 37%	2280
	11th to 20th	Day	18% 7% 2 6% 4 4 3 4 5% 7% 39%	2254
	21st to end	Day	18% 7% 2 6% 4 4 4 4 6% 6% 38%	2280
May	1st to 10th	Day	28% 7% 2 6% 4 4 4 3 5% 7% 30%	4151
	11th to 20th	Day	24% 9% 4 8% 5% 5% 4 3 5% 6% 29%	4398
	21st to end	Day	13% 5% 2 5% 4 4 5% 4 6% 10% 42%	4837
June	1st to 10th	Day	16% 6% 2 6% 5% 5% 6% 4 7% 8% 36%	2660
	11th to 20th	Day	15% 6% 2 7% 6% 4 5% 4 7% 9% 35%	2660
	21st to end	Day	13% 6% 2 6% 5% 5% 5% 3 6% 8% 40%	2660
July	1st to 10th	Day	9% 6% 2 8% 6% 6% 6% 5% 7% 10% 35%	4440
	11th to 20th	Day	10% 6% 2 6% 4 5% 5% 5% 7% 10% 39%	4440
	21st to end	Day	14% 9% 3 8% 5% 5% 6% 4 6% 7% 33%	4814
August	1st to 10th	Day	21% 6% 2 7% 4 4 5% 4 6% 8% 31%	4140
	11th to 20th	Day	12% 7% 3 6% 5% 4 4 4 6% 8% 41%	3739
	21st to end	Day	13% 6% 2 5% 4 4 4 3 5% 8% 46%	4180
September	1st to 10th	Day	16% 5% 2 6% 4 4 4 3 5% 7% 43%	2280
	11th to 20th	Day	13% 5% 2 5% 3 4 4 4 4 7% 50%	2237
	21st to end	Day	20% 6% 3 7% 4 4 5% 3 4 6% 39%	2090
October	1st to 10th	Day	20% 6% 2 6% 4 4 4 3 5% 7% 40%	1920
	11th to 20th	Day	16% 6% 2 6% 4 4 4 2 4 7% 45%	1900
	21st to end	Day	21% 6% 2 5% 4 4 4 3 5% 7% 40%	1986
November	1st to 10th	Day	14% 8% 2 5% 3 3 3 2 4 4 53%	1698
	11th to 20th	Day	18% 6% 2 5% 4 3 4 4 5% 5% 44%	1710
	21st to end	Day	17% 8% 2 5% 3 5% 4 4 5% 6% 41%	1572
December	1st to 10th	Day	20% 8% 3 8% 4 4 4 3 4 6% 35%	1520
	11th to 20th	Day	21% 8% 2 6% 4 4 5% 4 5% 5% 37%	1906
	21st to end	Day	19% 11% 4 10% 6% 5% 5% 4 5% 6% 26%	2772
January	1st to 10th	Night	17% 8% 2 6% 4 4 3 3 5% 5% 41%	4429
	11th to 20th	Night	15% 10% 4 8% 4 4 4 3 5% 6% 36%	4440
	21st to end	Night	24% 10% 3 7% 3 3 4 3 4 4 34%	4556
February	1st to 10th	Night	16% 9% 3 6% 4 3 4 4 5% 6% 40%	2470
	11th to 20th	Night	15% 9% 3 7% 5% 5% 4 3 5% 5% 38%	2262
	21st to end	Night	19% 8% 2 6% 4 4 4 4 5% 5% 40%	1884
March	1st to 10th	Night	23% 11% 3 6% 4 3 3 2 5% 5% 36%	3724
	11th to 20th	Night	11% 9% 3 6% 4 4 4 3 5% 6% 45%	3518
	21st to end	Night	17% 10% 3 6% 4 4 3 3 4 5% 43%	3563
April	1st to 10th	Night	18% 8% 3 7% 4 5% 5% 4 6% 6% 35%	1900
	11th to 20th	Night	18% 7% 2 6% 4 5% 4 3 4 7% 39%	1875
	21st to end	Night	20% 6% 2 4 4 3 4 4 4 7% 41%	1900
May	1st to 10th	Night	28% 9% 2 6% 3 4 4 3 4 6% 30%	2813
	11th to 20th	Night	24% 9% 3 7% 5% 4 3 3 5% 5% 31%	2495
	21st to end	Night	14% 7% 2 5% 4 4 4 4 6% 8% 41%	2738
June	1st to 10th	Night	16% 6% 2 4 4 4 5% 4 4 6% 44%	1520
	11th to 20th	Night	13% 6% 1 5% 4 5% 4 3 7% 9% 41%	1520
	21st to end	Night	13% 4 1 5% 4 3 5% 5% 7% 9% 44%	1520
July	1st to 10th	Night	10% 5% 2 6% 5% 6% 6% 5% 6% 10% 38%	2520
	11th to 20th	Night	10% 6% 2 6% 4 4 6% 5% 8% 10% 37%	2520
	21st to end	Night	15% 7% 3 6% 4 4 5% 5% 6% 9% 36%	2739
August	1st to 10th	Night	21% 7% 2 7% 4 5% 4 4 6% 8% 31%	2785
	11th to 20th	Night	15% 7% 3 7% 5% 4 4 3 5% 7% 41%	3058
	21st to end	Night	13% 5% 2 4 3 4 4 4 5% 8% 49%	3476
September	1st to 10th	Night	15% 6% 2 6% 3 3 3 3 5% 6% 46%	1900
	11th to 20th	Night	12% 5% 2 5% 3 3 3 2 4 6% 53%	1943
	21st to end	Night	18% 7% 2 6% 3 3 4 4 4 6% 44%	2090
October	1st to 10th	Night	21% 6% 3 6% 4 3 3 3 4 6% 42%	2256
	11th to 20th	Night	18% 5% 2 5% 3 4 3 3 4 6% 48%	2280
	21st to end	Night	21% 7% 2 5% 3 3 2 2 5% 7% 43%	2612
November	1st to 10th	Night	12% 6% 2 5% 4 3 4 4 5% 5% 51%	2453
	11th to 20th	Night	18% 8% 2 5% 3 3 4 3 4 5% 45%	2470
	21st to end	Night	14% 7% 2 5% 5% 4 4 3 6% 8% 42%	2607
December	1st to 10th	Night	19% 9% 3 7% 4 5% 4 4 5% 5% 36%	2660
	11th to 20th	Night	18% 9% 2 6% 4 4 5% 4 6% 6% 37%	3288
	21st to end	Night	20% 11% 3 8% 5% 4 4 2 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	53% 3 10% 24% 8% 2	3119
	11th to 20th	Day	38% 7% 13% 28% 13% 2	3438
	21st to end	Day	45% 3 8% 15% 24% 5%	4067
April	1st to 10th	Day	47% 5% 10% 20% 14% 5%	2280
	11th to 20th	Day	44% 5% 11% 21% 16% 3	2254
	21st to end	Day	43% 7% 10% 20% 15% 5%	2280
May	1st to 10th	Day	54% 7% 11% 16% 12% 1	4165
	11th to 20th	Day	56% 7% 10% 18% 8% 1	4402
	21st to end	Day	35% 8% 11% 26% 18% 2	4837
June	1st to 10th	Day	43% 8% 13% 21% 14% 1	2660
	11th to 20th	Day	45% 8% 13% 23% 10% 2	2660
	21st to end	Day	41% 8% 13% 24% 15% 1	2660
July	1st to 10th	Day	43% 8% 12% 22% 14% 1	4370
	11th to 20th	Day	38% 7% 17% 24% 13% 1	4365
	21st to end	Day	49% 6% 11% 17% 16% 1	4661
August	1st to 10th	Day	49% 8% 14% 19% 10%	4126
	11th to 20th	Day	40% 6% 13% 29% 12% 1	3775
	21st to end	Day	36% 5% 10% 31% 16% 2	4180
September	1st to 10th	Day	41% 6% 11% 21% 19% 2	2280
	11th to 20th	Day	34% 5% 10% 23% 25% 3	2237
	21st to end	Day	46% 6% 8% 18% 19% 2	2090
October	1st to 10th	Day	42% 4 8% 19% 23% 4	3193
	11th to 20th	Day	30% 5% 9% 28% 25% 4	3140
	21st to end	Day	28% 3 16% 24% 24% 4	3250
November	1st to 10th	Day	36% 4 11% 25% 19% 3	1698
	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	51% 4 10% 22% 11% 2	3734
	11th to 20th	Night	37% 5% 14% 26% 16% 2	3519
	21st to end	Night	45% 3 7% 17% 21% 6%	3563
April	1st to 10th	Night	48% 6% 10% 19% 14% 3	1900
	11th to 20th	Night	45% 6% 9% 20% 20% 1	1875
	21st to end	Night	42% 6% 9% 22% 17% 4	1900
May	1st to 10th	Night	54% 7% 9% 19% 9% 1	2819
	11th to 20th	Night	53% 7% 14% 14% 10% 1	2496
	21st to end	Night	38% 9% 14% 23% 13% 2	2739
June	1st to 10th	Night	40% 6% 11% 23% 18% 2	1520
	11th to 20th	Night	39% 7% 15% 25% 12% 1	1520
	21st to end	Night	34% 10% 14% 27% 15% 1	1520
July	1st to 10th	Night	41% 8% 15% 19% 15% 2	2480
	11th to 20th	Night	39% 8% 15% 25% 12% 1	2472
	21st to end	Night	43% 8% 14% 16% 18% 2	2651
August	1st to 10th	Night	50% 8% 16% 16% 9% 1	2775
	11th to 20th	Night	43% 6% 13% 26% 11% 1	3088
	21st to end	Night	33% 6% 10% 33% 18% 1	3476
September	1st to 10th	Night	40% 6% 10% 24% 20% 1	1900
	11th to 20th	Night	34% 5% 9% 23% 26% 4	1943
	21st to end	Night	41% 6% 9% 22% 21% 1	2090
October	1st to 10th	Night	43% 4 9% 23% 19% 1	3763
	11th to 20th	Night	29% 5% 9% 27% 27% 3	3779
	21st to end	Night	30% 4 13% 31% 20% 2	4298
November	1st to 10th	Night	35% 6% 12% 24% 21% 4	2453
	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% 21% 27% 12% 4 1	506
April	1st to 10th	Day	31% 23% 28% 11% 6%	460
	11th to 20th	Day	28% 21% 32% 12% 6% 1	452
	21st to end	Day	33% 15% 35% 13% 3 2	460
May	1st to 10th	Day	35% 18% 26% 13% 6% 1	463
	11th to 20th	Day	25% 17% 31% 21% 6% 1	487
	21st to end	Day	22% 11% 26% 26% 13% 2	529
June	1st to 10th	Day	19% 15% 30% 23% 10% 1	490
	11th to 20th	Day	19% 13% 28% 27% 11% 1	490
	21st to end	Day	18% 13% 32% 26% 10% 1	490
July	1st to 10th	Day	15% 8% 28% 28% 16% 5%	485
	11th to 20th	Day	12% 6% 29% 33% 17% 3	484
	21st to end	Day	15% 11% 31% 29% 11% 3	532
August	1st to 10th	Day	14% 8% 30% 30% 14% 5%	486
	11th to 20th	Day	13% 8% 29% 29% 16% 5%	479
	21st to end	Day	13% 9% 31% 25% 15% 6%	539
September	1st to 10th	Day	20% 10% 26% 24% 14% 6%	490
	11th to 20th	Day	12% 9% 29% 25% 14% 10%	490
	21st to end	Day	24% 14% 27% 21% 10% 3	490
October	1st to 10th	Day	26% 10% 27% 19% 12% 4	490
	11th to 20th	Day	20% 17% 32% 21% 9% 2	490
	21st to end	Day	26% 18% 30% 17% 8% 1	484
November	1st to 10th	Day	22% 16% 29% 21% 10% 2	374
	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	24% 23% 34% 13% 5% 1	836
April	1st to 10th	Night	25% 19% 36% 16% 3	760
	11th to 20th	Night	23% 18% 35% 20% 5%	751
	21st to end	Night	24% 15% 33% 23% 4 1	760
May	1st to 10th	Night	28% 15% 29% 22% 7%	562
	11th to 20th	Night	19% 14% 35% 25% 7%	374
	21st to end	Night	18% 6% 25% 38% 12%	411
June	1st to 10th	Night	16% 9% 27% 34% 12% 1	380
	11th to 20th	Night	15% 5% 34% 36% 11%	380
	21st to end	Night	14% 5% 27% 42% 12%	380
July	1st to 10th	Night	11% 6% 24% 36% 20% 2	370
	11th to 20th	Night	13% 5% 21% 41% 19% 2	368
	21st to end	Night	14% 4 24% 41% 15% 1	416
August	1st to 10th	Night	13% 2 20% 39% 22% 3	540
	11th to 20th	Night	15% 5% 20% 36% 23% 2	723
	21st to end	Night	15% 5% 22% 36% 21% 2	836
September	1st to 10th	Night	19% 5% 27% 31% 16% 2	760
	11th to 20th	Night	14% 6% 24% 31% 20% 4	760
	21st to end	Night	21% 6% 27% 30% 15% 2	760
October	1st to 10th	Night	23% 11% 23% 27% 14% 2	760
	11th to 20th	Night	19% 13% 29% 29% 8%	760
	21st to end	Night	26% 15% 31% 21% 7%	836
November	1st to 10th	Night	17% 16% 33% 24% 9% 1	755
	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 2024-11-01 22:47:50. Version ac07

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