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 2024-01-13.

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% 3 5% 5% 3 5% 5% 6% 7% 40%	74570
	Night	14% 6% 2 5% 5% 3 5% 5% 5% 7% 43%	75134
Transparency	Day	43% 3 12% 23% 16% 3	74291
	Night	41% 3 11% 24% 17% 3	74932
Seeing	Day	21% 13% 23% 23% 14% 6%	13879
	Night	18% 9% 22% 33% 16% 2	23941

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% 8% 2 6% 6% 5% 5% 4 4 6% 40%	1706
	11th to 20th	Day	18% 8% 3 5% 6% 3 4 4 5% 6% 38%	1638
	21st to end	Day	16% 9% 4 5% 4 2 4 4 5% 5% 42%	1782
February	1st to 10th	Day	14% 8% 4 5% 5% 4 6% 5% 5% 6% 38%	1620
	11th to 20th	Day	17% 7% 3 6% 5% 3 5% 4 5% 6% 38%	1573
	21st to end	Day	18% 7% 2 6% 5% 3 4 5% 5% 6% 38%	1557
March	1st to 10th	Day	14% 6% 2 4 3 2 4 4 5% 7% 49%	1980
	11th to 20th	Day	17% 7% 4 5% 5% 3 4 5% 6% 7% 37%	1980
	21st to end	Day	18% 7% 3 7% 5% 3 4 4 4 6% 38%	2178
April	1st to 10th	Day	12% 7% 2 5% 5% 3 4 4 5% 7% 46%	2078
	11th to 20th	Day	15% 5% 2 4 5% 3 5% 4 4 8% 45%	2134
	21st to end	Day	17% 5% 3 5% 5% 3 5% 5% 5% 6% 40%	2259
May	1st to 10th	Day	16% 6% 3 6% 6% 4 5% 5% 5% 7% 36%	2340
	11th to 20th	Day	19% 6% 3 5% 6% 3 5% 5% 6% 8% 33%	2301
	21st to end	Day	14% 5% 2 6% 6% 3 6% 6% 6% 8% 36%	2531
June	1st to 10th	Day	12% 3 3 5% 6% 4 6% 5% 6% 8% 42%	2484
	11th to 20th	Day	11% 6% 3 6% 6% 4 6% 6% 7% 9% 37%	2520
	21st to end	Day	9% 4 2 6% 6% 4 6% 6% 8% 10% 39%	2408
July	1st to 10th	Day	10% 6% 3 7% 6% 5% 6% 6% 5% 9% 36%	2340
	11th to 20th	Day	7% 3 3 5% 7% 4 7% 7% 9% 11% 36%	2340
	21st to end	Day	10% 5% 3 7% 7% 5% 7% 6% 8% 9% 32%	2547
August	1st to 10th	Day	13% 6% 2 6% 7% 3 6% 6% 8% 10% 34%	2327
	11th to 20th	Day	14% 5% 3 6% 6% 5% 6% 6% 7% 9% 33%	2303
	21st to end	Day	11% 6% 2 5% 6% 4 6% 7% 7% 10% 37%	2386
September	1st to 10th	Day	14% 5% 2 5% 5% 3 4 5% 4 8% 45%	2160
	11th to 20th	Day	15% 6% 2 6% 5% 3 4 4 5% 7% 42%	2003
	21st to end	Day	22% 6% 2 5% 5% 3 4 4 6% 6% 36%	1963
October	1st to 10th	Day	16% 6% 2 6% 6% 3 4 3 4 5% 45%	1800
	11th to 20th	Day	16% 6% 2 5% 4 3 3 3 4 7% 48%	1800
	21st to end	Day	17% 5% 3 5% 4 2 3 4 4 7% 47%	1980
November	1st to 10th	Day	12% 5% 2 5% 4 2 3 3 4 5% 55%	1857
	11th to 20th	Day	13% 5% 2 5% 3 2 4 5% 5% 7% 49%	1736
	21st to end	Day	15% 6% 2 5% 3 2 4 4 4 7% 49%	1520
December	1st to 10th	Day	18% 8% 3 5% 5% 3 4 4 5% 6% 37%	1520
	11th to 20th	Day	15% 5% 2 4 4 3 3 4 4 7% 50%	1910
	21st to end	Day	21% 5% 2 5% 6% 3 6% 6% 7% 7% 32%	3009
January	1st to 10th	Night	14% 6% 2 4 6% 4 5% 5% 6% 7% 43%	2459
	11th to 20th	Night	17% 8% 2 5% 5% 2 4 4 5% 7% 40%	2367
	21st to end	Night	13% 7% 2 5% 4 3 5% 5% 5% 6% 44%	2574
February	1st to 10th	Night	13% 8% 3 5% 5% 3 5% 5% 6% 7% 41%	2340
	11th to 20th	Night	18% 7% 3 5% 5% 3 4 5% 5% 7% 39%	2273
	21st to end	Night	17% 7% 3 6% 4 3 5% 5% 5% 7% 39%	1695
March	1st to 10th	Night	13% 5% 2 4 4 3 4 4 5% 6% 50%	1980
	11th to 20th	Night	18% 6% 3 5% 5% 3 5% 5% 5% 7% 39%	1980
	21st to end	Night	15% 6% 3 5% 5% 3 4 4 4 6% 45%	2178
April	1st to 10th	Night	15% 5% 3 5% 4 2 5% 5% 5% 7% 43%	1882
	11th to 20th	Night	13% 5% 2 4 4 2 4 4 6% 8% 47%	1775
	21st to end	Night	16% 5% 2 5% 5% 3 5% 4 6% 6% 44%	1715
May	1st to 10th	Night	14% 6% 3 6% 5% 4 5% 4 5% 7% 41%	1620
	11th to 20th	Night	19% 6% 3 6% 5% 3 4 5% 6% 7% 35%	1592
	21st to end	Night	14% 6% 2 5% 4 3 4 5% 6% 9% 42%	1744
June	1st to 10th	Night	10% 3 2 6% 5% 3 5% 5% 7% 10% 44%	1468
	11th to 20th	Night	11% 4 2 6% 6% 3 5% 5% 5% 9% 45%	1440
	21st to end	Night	10% 3 2 4 4 3 6% 6% 7% 9% 48%	1543
July	1st to 10th	Night	8% 6% 2 6% 6% 4 5% 5% 8% 9% 43%	1620
	11th to 20th	Night	6% 4 1 4 4 3 5% 6% 8% 12% 47%	1620
	21st to end	Night	7% 4 2 6% 5% 4 5% 6% 8% 11% 42%	1771
August	1st to 10th	Night	13% 6% 2 4 5% 3 6% 6% 6% 10% 38%	1611
	11th to 20th	Night	12% 6% 3 5% 6% 4 6% 5% 5% 8% 40%	1598
	21st to end	Night	9% 6% 2 5% 6% 3 5% 6% 7% 11% 39%	1952
September	1st to 10th	Night	12% 5% 2 6% 5% 2 3 4 5% 7% 48%	1800
	11th to 20th	Night	15% 6% 2 4 4 3 4 5% 5% 8% 44%	1952
	21st to end	Night	20% 7% 2 5% 4 2 4 5% 5% 7% 39%	1996
October	1st to 10th	Night	15% 5% 2 5% 4 3 4 4 5% 6% 46%	2160
	11th to 20th	Night	15% 4 2 5% 4 3 4 5% 5% 6% 48%	2160
	21st to end	Night	15% 4 2 4 4 2 4 4 4 6% 51%	2376
November	1st to 10th	Night	13% 7% 3 4 4 2 3 3 4 5% 53%	2221
	11th to 20th	Night	13% 4 2 4 4 2 4 5% 5% 6% 50%	2439
	21st to end	Night	14% 5% 2 4 4 2 5% 4 5% 7% 48%	2660
December	1st to 10th	Night	18% 8% 3 5% 4 3 4 4 4 6% 41%	2660
	11th to 20th	Night	15% 6% 3 5% 5% 3 5% 5% 5% 6% 42%	3285
	21st to end	Night	17% 5% 2 6% 6% 3 6% 6% 6% 7% 36%	4628

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	46% 3 8% 21% 18% 5%	1707
	11th to 20th	Day	48% 2 9% 22% 17% 2	1638
	21st to end	Day	45% 2 8% 21% 19% 5%	1782
February	1st to 10th	Day	47% 3 10% 23% 14% 3	1620
	11th to 20th	Day	47% 2 9% 21% 18% 4	1582
	21st to end	Day	47% 3 10% 18% 17% 5%	1557
March	1st to 10th	Day	36% 3 10% 24% 22% 4	1980
	11th to 20th	Day	47% 3 9% 18% 17% 5%	1980
	21st to end	Day	48% 3 9% 21% 14% 5%	2178
April	1st to 10th	Day	39% 3 11% 22% 17% 8%	2078
	11th to 20th	Day	39% 2 10% 23% 20% 5%	2134
	21st to end	Day	46% 3 11% 22% 14% 4	2259
May	1st to 10th	Day	48% 4 13% 20% 12% 3	2340
	11th to 20th	Day	49% 5% 15% 21% 8% 3	2305
	21st to end	Day	45% 4 17% 24% 10% 1	2531
June	1st to 10th	Day	40% 5% 15% 26% 14% 1	2484
	11th to 20th	Day	42% 5% 16% 21% 15% 1	2520
	21st to end	Day	38% 7% 15% 27% 12% 2	2408
July	1st to 10th	Day	45% 5% 13% 19% 14% 3	2275
	11th to 20th	Day	37% 6% 20% 22% 14% 2	2271
	21st to end	Day	45% 5% 13% 23% 13% 1	2405
August	1st to 10th	Day	45% 5% 16% 24% 9% 1	2314
	11th to 20th	Day	47% 4 14% 23% 11% 1	2303
	21st to end	Day	41% 5% 17% 24% 11% 3	2386
September	1st to 10th	Day	39% 5% 13% 20% 19% 4	2160
	11th to 20th	Day	42% 3 6% 26% 19% 3	2003
	21st to end	Day	48% 3 7% 22% 18% 2	1963
October	1st to 10th	Day	42% 3 7% 27% 16% 5%	1800
	11th to 20th	Day	38% 2 9% 26% 20% 4	1800
	21st to end	Day	39% 1 7% 26% 21% 6%	1980
November	1st to 10th	Day	33% 2 9% 23% 27% 5%	1857
	11th to 20th	Day	36% 2 9% 23% 22% 7%	1736
	21st to end	Day	38% 2 9% 26% 23% 3	1520
December	1st to 10th	Day	48% 3 11% 20% 15% 4	1520
	11th to 20th	Day	36% 2 8% 27% 21% 7%	1906
	21st to end	Day	52% 2 9% 23% 12% 2	3009
January	1st to 10th	Night	41% 3 8% 23% 19% 6%	2459
	11th to 20th	Night	44% 3 9% 23% 17% 4	2367
	21st to end	Night	41% 2 8% 25% 20% 3	2574
February	1st to 10th	Night	43% 2 12% 25% 16% 2	2340
	11th to 20th	Night	45% 3 9% 21% 17% 6%	2275
	21st to end	Night	46% 3 10% 23% 14% 5%	1695
March	1st to 10th	Night	35% 3 11% 26% 21% 5%	1980
	11th to 20th	Night	46% 3 8% 22% 18% 3	1980
	21st to end	Night	43% 4 10% 22% 17% 4	2178
April	1st to 10th	Night	40% 4 12% 20% 19% 5%	1882
	11th to 20th	Night	36% 3 14% 22% 21% 5%	1775
	21st to end	Night	41% 4 11% 26% 15% 3	1715
May	1st to 10th	Night	43% 5% 15% 21% 13% 3	1620
	11th to 20th	Night	48% 4 15% 22% 10% 1	1593
	21st to end	Night	40% 5% 18% 27% 8% 1	1745
June	1st to 10th	Night	35% 7% 14% 29% 14% 1	1468
	11th to 20th	Night	38% 5% 18% 23% 13% 3	1440
	21st to end	Night	32% 8% 17% 25% 16% 2	1543
July	1st to 10th	Night	38% 6% 17% 21% 14% 3	1575
	11th to 20th	Night	30% 7% 19% 28% 14% 1	1566
	21st to end	Night	33% 6% 19% 28% 13%	1672
August	1st to 10th	Night	42% 5% 17% 24% 10% 1	1600
	11th to 20th	Night	43% 3 15% 26% 12% 1	1598
	21st to end	Night	39% 5% 18% 24% 12% 3	1952
September	1st to 10th	Night	36% 5% 15% 22% 18% 4	1800
	11th to 20th	Night	39% 3 10% 27% 18% 3	1952
	21st to end	Night	46% 3 10% 21% 17% 3	1996
October	1st to 10th	Night	39% 3 10% 27% 17% 3	2160
	11th to 20th	Night	39% 2 7% 27% 21% 3	2160
	21st to end	Night	36% 2 8% 24% 25% 5%	2376
November	1st to 10th	Night	36% 1 8% 23% 25% 6%	2221
	11th to 20th	Night	35% 2 8% 25% 24% 6%	2439
	21st to end	Night	37% 2 9% 27% 21% 5%	2660
December	1st to 10th	Night	47% 3 8% 26% 14% 3	2660
	11th to 20th	Night	43% 2 8% 23% 19% 5%	3288
	21st to end	Night	47% 2 10% 22% 18% 1	4628

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	33% 24% 26% 13% 4 1	270
	11th to 20th	Day	35% 20% 32% 11% 2	246
	21st to end	Day	34% 25% 25% 12% 3	264
February	1st to 10th	Day	31% 27% 29% 10% 3	240
	11th to 20th	Day	44% 24% 26% 5% 1	240
	21st to end	Day	36% 23% 22% 17% 2	288
March	1st to 10th	Day	28% 21% 24% 22% 6%	420
	11th to 20th	Day	28% 24% 23% 20% 5% 1	420
	21st to end	Day	26% 21% 27% 18% 7% 1	462
April	1st to 10th	Day	24% 22% 24% 20% 9% 1	420
	11th to 20th	Day	23% 17% 24% 20% 13% 4	412
	21st to end	Day	30% 14% 28% 16% 10% 3	420
May	1st to 10th	Day	26% 16% 27% 19% 7% 4	423
	11th to 20th	Day	23% 12% 27% 20% 13% 5%	447
	21st to end	Day	17% 8% 23% 24% 19% 10%	485
June	1st to 10th	Day	14% 10% 26% 26% 17% 7%	450
	11th to 20th	Day	16% 9% 23% 27% 16% 9%	450
	21st to end	Day	11% 8% 28% 30% 15% 8%	450
July	1st to 10th	Day	13% 4 18% 28% 23% 15%	445
	11th to 20th	Day	5% 4 17% 34% 27% 13%	444
	21st to end	Day	11% 5% 20% 30% 23% 12%	488
August	1st to 10th	Day	16% 5% 19% 23% 22% 15%	446
	11th to 20th	Day	13% 4 18% 27% 24% 14%	439
	21st to end	Day	14% 3 16% 28% 22% 17%	495
September	1st to 10th	Day	15% 7% 15% 26% 23% 15%	450
	11th to 20th	Day	14% 3 18% 31% 23% 11%	450
	21st to end	Day	27% 9% 18% 24% 16% 5%	450
October	1st to 10th	Day	21% 8% 21% 26% 19% 5%	450
	11th to 20th	Day	18% 14% 23% 28% 15% 2	450
	21st to end	Day	22% 15% 27% 23% 11% 2	495
November	1st to 10th	Day	21% 11% 24% 29% 12% 3	455
	11th to 20th	Day	26% 18% 22% 26% 7% 1	308
	21st to end	Day	25% 14% 27% 23% 8% 2	180
December	1st to 10th	Day	27% 25% 27% 14% 6% 1	180
	11th to 20th	Day	28% 17% 26% 17% 9% 3	180
	21st to end	Day	30% 15% 31% 15% 7% 1	267
January	1st to 10th	Night	22% 15% 32% 28% 3	760
	11th to 20th	Night	24% 13% 26% 33% 4	729
	21st to end	Night	19% 15% 36% 27% 3	792
February	1st to 10th	Night	20% 18% 28% 33% 2	720
	11th to 20th	Night	26% 18% 31% 24% 1	703
	21st to end	Night	24% 15% 36% 23% 2	592
March	1st to 10th	Night	19% 14% 31% 31% 4	720
	11th to 20th	Night	25% 14% 29% 24% 7% 1	720
	21st to end	Night	20% 14% 29% 30% 7% 1	792
April	1st to 10th	Night	20% 16% 30% 27% 7%	720
	11th to 20th	Night	17% 15% 25% 30% 13%	711
	21st to end	Night	20% 8% 26% 35% 10% 1	635
May	1st to 10th	Night	15% 10% 23% 34% 17% 2	540
	11th to 20th	Night	21% 4 20% 39% 14% 2	531
	21st to end	Night	17% 1 11% 35% 31% 5%	584
June	1st to 10th	Night	9% 2 12% 44% 31% 2	388
	11th to 20th	Night	10% 3 11% 43% 30% 2	360
	21st to end	Night	10% 3 12% 45% 26% 4	463
July	1st to 10th	Night	13% 2 6% 37% 34% 7%	525
	11th to 20th	Night	6% 1 6% 35% 47% 4	522
	21st to end	Night	7% 1 9% 38% 39% 5%	591
August	1st to 10th	Night	15% 2 7% 36% 37% 4	537
	11th to 20th	Night	15% 2 8% 32% 38% 6%	534
	21st to end	Night	12% 2 11% 32% 37% 6%	764
September	1st to 10th	Night	13% 2 11% 33% 35% 7%	720
	11th to 20th	Night	17% 3 11% 34% 30% 5%	720
	21st to end	Night	21% 6% 17% 33% 22% 2	720
October	1st to 10th	Night	17% 7% 17% 32% 24% 4	720
	11th to 20th	Night	16% 10% 23% 34% 17% 1	720
	21st to end	Night	17% 10% 23% 34% 13% 2	792
November	1st to 10th	Night	17% 8% 24% 36% 14% 2	740
	11th to 20th	Night	19% 11% 23% 36% 10% 1	760
	21st to end	Night	17% 11% 24% 36% 9% 1	760
December	1st to 10th	Night	23% 14% 26% 30% 6%	760
	11th to 20th	Night	18% 10% 30% 36% 6%	760
	21st to end	Night	22% 12% 26% 36% 4	836

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