Goshen
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Goshen clear sky chart from 2005-11-06 to 2025-11-18.

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% 5% 5% 5% 4 6% 8% 40%	126243
	Night	14% 6% 2 6% 4 4 4 4 5% 7% 43%	124103
Transparency	Day	41% 5% 11% 22% 16% 4	129848
	Night	40% 4 11% 23% 17% 4	128567
Seeing	Day	22% 13% 23% 23% 13% 6%	16393
	Night	18% 9% 22% 33% 16% 2	26359

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	13% 7% 2 6% 5% 5% 4 3 4 5% 46%	4056
	11th to 20th	Day	11% 9% 4 6% 5% 4 4 3 4 5% 45%	4060
	21st to end	Day	17% 7% 2 5% 4 3 3 3 5% 5% 46%	4466
February	1st to 10th	Day	13% 8% 4 6% 4 5% 5% 4 5% 6% 39%	1800
	11th to 20th	Day	17% 7% 3 6% 5% 4 4 4 6% 6% 38%	1753
	21st to end	Day	18% 7% 2 6% 5% 4 4 3 5% 5% 39%	1736
March	1st to 10th	Day	17% 7% 2 6% 3 4 5% 4 6% 7% 39%	4935
	11th to 20th	Day	11% 5% 2 5% 4 3 4 3 5% 7% 50%	4980
	21st to end	Day	15% 7% 3 8% 5% 4 4 3 5% 6% 40%	5465
April	1st to 10th	Day	12% 8% 2 6% 4 4 4 3 5% 7% 44%	2310
	11th to 20th	Day	14% 5% 2 5% 4 4 4 4 5% 8% 44%	2374
	21st to end	Day	16% 6% 3 6% 5% 4 4 4 6% 6% 40%	2511
May	1st to 10th	Day	15% 6% 2 7% 6% 6% 6% 5% 7% 9% 31%	5862
	11th to 20th	Day	22% 7% 3 7% 5% 5% 4 4 6% 8% 30%	5861
	21st to end	Day	16% 5% 2 6% 5% 5% 5% 4 6% 9% 36%	6433
June	1st to 10th	Day	11% 4 2 6% 6% 5% 5% 4 6% 9% 41%	2760
	11th to 20th	Day	10% 6% 2 6% 5% 5% 6% 5% 7% 9% 37%	2800
	21st to end	Day	8% 4 2 6% 5% 5% 6% 5% 8% 10% 40%	2674
July	1st to 10th	Day	7% 5% 2 7% 6% 5% 6% 5% 7% 10% 40%	5900
	11th to 20th	Day	8% 5% 3 7% 6% 6% 7% 6% 9% 12% 30%	5900
	21st to end	Day	10% 7% 3 8% 6% 6% 6% 5% 8% 10% 31%	6424
August	1st to 10th	Day	15% 6% 2 7% 6% 5% 6% 5% 8% 10% 31%	4234
	11th to 20th	Day	9% 5% 2 7% 6% 6% 6% 6% 8% 9% 37%	4174
	21st to end	Day	8% 5% 2 6% 4 4 5% 4 6% 10% 46%	4322
September	1st to 10th	Day	13% 5% 2 6% 4 4 4 4 4 7% 47%	2400
	11th to 20th	Day	15% 7% 2 7% 4 4 4 3 5% 7% 42%	2225
	21st to end	Day	23% 8% 2 6% 5% 4 4 4 5% 6% 34%	2181
October	1st to 10th	Day	15% 6% 2 7% 5% 3 4 2 4 6% 47%	2000
	11th to 20th	Day	15% 6% 2 5% 4 4 3 3 4 6% 50%	2000
	21st to end	Day	16% 5% 2 6% 3 3 3 3 4 7% 48%	2200
November	1st to 10th	Day	11% 6% 2 5% 4 3 3 3 4 5% 54%	2057
	11th to 20th	Day	13% 6% 2 5% 3 3 4 4 5% 7% 49%	1891
	21st to end	Day	14% 6% 2 6% 3 4 4 3 5% 7% 48%	1600
December	1st to 10th	Day	13% 8% 3 6% 4 4 4 3 5% 4 48%	2600
	11th to 20th	Day	19% 9% 2 4 3 4 3 3 4 6% 42%	2990
	21st to end	Day	21% 7% 3 6% 5% 5% 5% 4 6% 6% 32%	4309
January	1st to 10th	Night	11% 7% 2 5% 4 4 4 4 5% 6% 48%	5889
	11th to 20th	Night	13% 7% 2 6% 3 3 3 3 5% 6% 50%	5900
	21st to end	Night	17% 7% 2 5% 3 3 3 3 4 5% 50%	6490
February	1st to 10th	Night	13% 8% 3 6% 4 4 4 4 6% 7% 41%	2600
	11th to 20th	Night	18% 8% 2 6% 5% 3 4 4 6% 6% 39%	2533
	21st to end	Night	15% 7% 3 6% 4 4 5% 4 5% 7% 40%	1890
March	1st to 10th	Night	18% 6% 2 5% 3 3 3 3 5% 6% 44%	4918
	11th to 20th	Night	11% 5% 2 5% 3 3 4 4 5% 8% 51%	4980
	21st to end	Night	14% 6% 2 6% 5% 5% 5% 4 5% 6% 43%	5467
April	1st to 10th	Night	16% 6% 2 6% 4 4 4 4 6% 7% 42%	2090
	11th to 20th	Night	13% 5% 2 5% 4 4 4 4 6% 8% 46%	1975
	21st to end	Night	15% 5% 2 5% 5% 4 5% 4 6% 6% 43%	1905
May	1st to 10th	Night	18% 8% 3 6% 4 5% 4 4 5% 8% 36%	4033
	11th to 20th	Night	23% 7% 3 8% 5% 4 4 4 5% 7% 29%	4032
	21st to end	Night	16% 6% 2 6% 5% 5% 5% 4 7% 9% 36%	4421
June	1st to 10th	Night	9% 5% 2 6% 4 4 4 4 7% 11% 43%	1630
	11th to 20th	Night	11% 5% 1 6% 5% 4 5% 4 6% 9% 45%	1600
	21st to end	Night	9% 5% 2 4 4 4 5% 4 7% 9% 47%	1715
July	1st to 10th	Night	8% 6% 2 7% 5% 5% 5% 4 7% 9% 41%	4058
	11th to 20th	Night	12% 7% 2 8% 6% 6% 6% 6% 8% 10% 29%	4057
	21st to end	Night	11% 8% 3 10% 6% 6% 6% 5% 7% 9% 30%	4427
August	1st to 10th	Night	17% 6% 3 6% 5% 5% 6% 4 6% 10% 32%	2915
	11th to 20th	Night	11% 6% 2 7% 5% 6% 6% 5% 6% 8% 38%	2875
	21st to end	Night	10% 6% 2 5% 4 4 5% 4 6% 9% 45%	3543
September	1st to 10th	Night	11% 5% 2 7% 4 3 4 3 5% 7% 49%	2000
	11th to 20th	Night	16% 6% 2 5% 4 4 5% 4 5% 7% 43%	2170
	21st to end	Night	23% 8% 2 5% 4 4 3 4 5% 7% 35%	2218
October	1st to 10th	Night	15% 6% 2 5% 3 4 3 3 5% 6% 47%	2400
	11th to 20th	Night	14% 5% 2 5% 4 3 5% 3 5% 6% 49%	2400
	21st to end	Night	15% 4 2 4 4 3 4 3 4 6% 52%	2640
November	1st to 10th	Night	12% 7% 3 5% 3 3 3 2 4 5% 52%	2461
	11th to 20th	Night	13% 5% 2 5% 3 3 4 4 4 6% 49%	2658
	21st to end	Night	13% 6% 2 5% 4 4 4 3 5% 7% 47%	2800
December	1st to 10th	Night	12% 6% 2 5% 4 4 4 3 5% 6% 48%	4580
	11th to 20th	Night	17% 8% 2 5% 4 5% 5% 4 5% 6% 39%	5205
	21st to end	Night	17% 5% 2 6% 4 5% 5% 5% 6% 7% 38%	6628

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	41% 2 4 21% 23% 8%	4057
	11th to 20th	Day	43% 1 7% 17% 21% 11%	4060
	21st to end	Day	42% 2 6% 26% 20% 4	4466
February	1st to 10th	Day	45% 3 10% 24% 16% 3	1800
	11th to 20th	Day	47% 2 9% 21% 18% 4	1762
	21st to end	Day	46% 3 10% 18% 17% 6%	1736
March	1st to 10th	Day	44% 3 8% 21% 15% 9%	4935
	11th to 20th	Day	35% 3 7% 27% 21% 9%	4980
	21st to end	Day	47% 3 9% 18% 18% 6%	5465
April	1st to 10th	Day	41% 3 10% 22% 17% 7%	2310
	11th to 20th	Day	39% 2 11% 23% 20% 5%	2374
	21st to end	Day	45% 3 11% 24% 14% 4	2511
May	1st to 10th	Day	48% 5% 13% 21% 10% 2	5897
	11th to 20th	Day	53% 4 10% 21% 11% 1	5865
	21st to end	Day	43% 5% 14% 20% 15% 3	6447
June	1st to 10th	Day	39% 5% 15% 26% 15% 1	2760
	11th to 20th	Day	41% 6% 16% 21% 15% 1	2800
	21st to end	Day	37% 7% 15% 27% 13% 2	2674
July	1st to 10th	Day	38% 9% 18% 20% 10% 4	5835
	11th to 20th	Day	41% 11% 20% 20% 7% 1	5831
	21st to end	Day	44% 8% 15% 22% 10%	6240
August	1st to 10th	Day	45% 7% 18% 23% 7%	4221
	11th to 20th	Day	39% 7% 14% 28% 12% 1	4213
	21st to end	Day	33% 6% 17% 28% 13% 2	4322
September	1st to 10th	Day	38% 5% 12% 19% 21% 4	2400
	11th to 20th	Day	42% 3 6% 26% 20% 3	2225
	21st to end	Day	51% 3 8% 20% 16% 2	2181
October	1st to 10th	Day	34% 4 7% 21% 27% 8%	3260
	11th to 20th	Day	25% 3 9% 26% 23% 13%	3240
	21st to end	Day	25% 3 9% 30% 20% 13%	3538
November	1st to 10th	Day	33% 3 10% 23% 27% 5%	2057
	11th to 20th	Day	35% 2 9% 23% 23% 8%	1891
	21st to end	Day	38% 2 10% 26% 23% 3	1600
December	1st to 10th	Day	39% 4 9% 22% 21% 6%	2600
	11th to 20th	Day	44% 3 11% 21% 18% 4	2986
	21st to end	Day	52% 3 10% 20% 14% 1	4309
January	1st to 10th	Night	36% 3 6% 23% 24% 8%	5889
	11th to 20th	Night	36% 3 6% 24% 23% 9%	5900
	21st to end	Night	39% 1 6% 28% 20% 5%	6490
February	1st to 10th	Night	42% 2 12% 26% 17% 2	2600
	11th to 20th	Night	46% 3 8% 20% 17% 6%	2535
	21st to end	Night	44% 3 10% 23% 15% 5%	1890
March	1st to 10th	Night	42% 2 7% 22% 19% 7%	4918
	11th to 20th	Night	33% 2 8% 24% 27% 6%	4980
	21st to end	Night	41% 4 10% 21% 19% 5%	5467
April	1st to 10th	Night	41% 4 12% 19% 19% 5%	2090
	11th to 20th	Night	37% 3 14% 22% 19% 5%	1975
	21st to end	Night	40% 4 12% 27% 15% 3	1905
May	1st to 10th	Night	48% 6% 14% 19% 11% 2	4060
	11th to 20th	Night	55% 5% 10% 21% 9%	4033
	21st to end	Night	43% 6% 17% 24% 7% 3	4429
June	1st to 10th	Night	35% 7% 14% 27% 16% 1	1630
	11th to 20th	Night	37% 5% 18% 25% 12% 2	1600
	21st to end	Night	32% 8% 17% 25% 17% 2	1715
July	1st to 10th	Night	38% 10% 18% 19% 13% 2	4015
	11th to 20th	Night	47% 12% 16% 18% 6% 1	4006
	21st to end	Night	47% 10% 15% 19% 9%	4297
August	1st to 10th	Night	47% 7% 17% 22% 6%	2904
	11th to 20th	Night	42% 6% 16% 24% 12% 1	2902
	21st to end	Night	35% 6% 19% 30% 9% 2	3543
September	1st to 10th	Night	35% 5% 15% 21% 19% 5%	2000
	11th to 20th	Night	40% 4 10% 26% 18% 2	2170
	21st to end	Night	50% 3 9% 20% 16% 2	2218
October	1st to 10th	Night	38% 5% 9% 21% 22% 6%	3920
	11th to 20th	Night	27% 3 9% 22% 28% 11%	3899
	21st to end	Night	23% 2 10% 29% 27% 9%	4252
November	1st to 10th	Night	37% 2 7% 23% 25% 6%	2461
	11th to 20th	Night	35% 3 8% 24% 24% 6%	2658
	21st to end	Night	37% 3 9% 26% 21% 5%	2800
December	1st to 10th	Night	36% 5% 9% 28% 21% 2	4580
	11th to 20th	Night	47% 3 10% 19% 16% 5%	5208
	21st to end	Night	45% 4 11% 22% 17% 1	6628

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	36% 24% 23% 12% 4 1	300
	11th to 20th	Day	40% 20% 29% 10% 2	300
	21st to end	Day	33% 26% 25% 12% 3	330
February	1st to 10th	Day	29% 28% 28% 11% 4	300
	11th to 20th	Day	48% 22% 24% 6% 1	300
	21st to end	Day	35% 21% 24% 17% 2	349
March	1st to 10th	Day	30% 20% 22% 22% 5% 1	500
	11th to 20th	Day	27% 24% 24% 20% 5% 1	500
	21st to end	Day	27% 22% 27% 17% 6% 1	550
April	1st to 10th	Day	26% 24% 24% 17% 8% 1	500
	11th to 20th	Day	23% 17% 26% 19% 11% 3	492
	21st to end	Day	27% 14% 28% 17% 11% 3	500
May	1st to 10th	Day	25% 17% 28% 18% 7% 4	503
	11th to 20th	Day	25% 13% 26% 19% 12% 5%	527
	21st to end	Day	19% 10% 23% 22% 17% 9%	573
June	1st to 10th	Day	12% 11% 29% 25% 16% 7%	530
	11th to 20th	Day	15% 8% 24% 28% 16% 8%	530
	21st to end	Day	10% 8% 28% 29% 16% 9%	530
July	1st to 10th	Day	11% 4 19% 30% 22% 14%	525
	11th to 20th	Day	6% 4 19% 33% 26% 12%	524
	21st to end	Day	13% 5% 20% 28% 22% 13%	576
August	1st to 10th	Day	16% 6% 20% 23% 21% 14%	526
	11th to 20th	Day	12% 4 20% 28% 24% 13%	519
	21st to end	Day	13% 4 16% 31% 22% 15%	583
September	1st to 10th	Day	13% 7% 17% 28% 22% 14%	530
	11th to 20th	Day	15% 3 19% 30% 23% 11%	530
	21st to end	Day	30% 10% 19% 23% 15% 4	530
October	1st to 10th	Day	19% 8% 21% 29% 18% 5%	530
	11th to 20th	Day	18% 14% 23% 27% 15% 2	530
	21st to end	Day	23% 14% 27% 24% 10% 2	583
November	1st to 10th	Day	20% 13% 25% 29% 10% 2	535
	11th to 20th	Day	27% 19% 23% 24% 6% 1	361
	21st to end	Day	28% 16% 26% 22% 7% 2	200
December	1st to 10th	Day	26% 27% 26% 15% 6% 1	200
	11th to 20th	Day	30% 17% 25% 19% 8% 3	200
	21st to end	Day	31% 14% 31% 15% 7% 1	297
January	1st to 10th	Night	23% 16% 32% 26% 3	800
	11th to 20th	Night	24% 15% 28% 30% 3	800
	21st to end	Night	20% 15% 37% 26% 2	880
February	1st to 10th	Night	19% 17% 29% 33% 2	800
	11th to 20th	Night	27% 18% 32% 22% 1	783
	21st to end	Night	24% 15% 36% 24% 2	660
March	1st to 10th	Night	21% 15% 31% 29% 5%	800
	11th to 20th	Night	24% 15% 30% 24% 7% 1	800
	21st to end	Night	19% 15% 31% 29% 6% 1	880
April	1st to 10th	Night	20% 16% 31% 26% 6%	800
	11th to 20th	Night	17% 15% 26% 30% 12%	791
	21st to end	Night	19% 8% 27% 35% 10% 1	705
May	1st to 10th	Night	15% 10% 23% 35% 17% 2	600
	11th to 20th	Night	21% 5% 20% 39% 14% 1	591
	21st to end	Night	17% 2 13% 34% 29% 4	650
June	1st to 10th	Night	9% 2 13% 44% 30% 2	430
	11th to 20th	Night	11% 3 12% 44% 29% 2	400
	21st to end	Night	10% 3 13% 43% 27% 4	515
July	1st to 10th	Night	12% 3 7% 38% 34% 6%	585
	11th to 20th	Night	7% 1 6% 36% 46% 4	582
	21st to end	Night	7% 2 9% 39% 38% 5%	657
August	1st to 10th	Night	15% 2 7% 37% 35% 5%	597
	11th to 20th	Night	14% 2 8% 33% 38% 5%	594
	21st to end	Night	12% 3 11% 33% 36% 5%	850
September	1st to 10th	Night	12% 2 11% 36% 33% 6%	800
	11th to 20th	Night	17% 3 11% 34% 30% 5%	800
	21st to end	Night	24% 6% 17% 33% 20% 2	800
October	1st to 10th	Night	17% 7% 17% 32% 25% 4	800
	11th to 20th	Night	15% 10% 24% 35% 16% 1	800
	21st to end	Night	17% 10% 23% 35% 13% 2	880
November	1st to 10th	Night	16% 8% 24% 37% 13% 2	820
	11th to 20th	Night	20% 11% 24% 35% 9% 1	829
	21st to end	Night	18% 11% 25% 35% 9% 1	800
December	1st to 10th	Night	23% 14% 28% 30% 6%	800
	11th to 20th	Night	19% 10% 29% 35% 6%	800
	21st to end	Night	22% 12% 26% 37% 4	880

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