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 2024-11-08.

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% 39%	100871
	Night	15% 6% 2 6% 4 4 4 4 5% 7% 42%	98152
Transparency	Day	42% 4 11% 23% 15% 4	104520
	Night	41% 4 11% 24% 17% 4	102642
Seeing	Day	21% 13% 23% 23% 14% 6%	15036
	Night	18% 9% 22% 33% 16% 2	25002

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	15% 8% 3 6% 5% 5% 4 3 4 6% 41%	2836
	11th to 20th	Day	13% 10% 4 8% 6% 5% 4 4 5% 5% 36%	2840
	21st to end	Day	20% 10% 3 6% 4 3 3 3 4 5% 39%	3124
February	1st to 10th	Day	13% 8% 3 6% 5% 5% 5% 4 5% 6% 39%	1710
	11th to 20th	Day	16% 7% 3 6% 5% 4 4 4 6% 7% 38%	1663
	21st to end	Day	18% 7% 2 6% 5% 5% 5% 3 5% 6% 38%	1651
March	1st to 10th	Day	21% 9% 2 6% 3 4 4 3 5% 7% 35%	3435
	11th to 20th	Day	10% 5% 2 5% 4 3 4 4 6% 7% 49%	3480
	21st to end	Day	18% 8% 3 8% 5% 4 4 3 4 6% 38%	3815
April	1st to 10th	Day	11% 7% 2 6% 4 4 4 3 5% 7% 45%	2194
	11th to 20th	Day	15% 5% 2 5% 4 4 4 4 5% 8% 44%	2254
	21st to end	Day	17% 6% 3 6% 5% 4 4 4 6% 6% 40%	2385
May	1st to 10th	Day	18% 7% 3 7% 6% 6% 5% 5% 6% 7% 30%	4082
	11th to 20th	Day	23% 7% 3 6% 5% 5% 5% 4 5% 8% 31%	4081
	21st to end	Day	10% 4 2 6% 5% 5% 5% 5% 7% 10% 41%	4476
June	1st to 10th	Day	12% 4 3 6% 6% 5% 5% 4 6% 9% 41%	2622
	11th to 20th	Day	10% 6% 2 6% 5% 5% 6% 6% 7% 9% 38%	2660
	21st to end	Day	9% 4 2 6% 5% 5% 6% 5% 8% 9% 39%	2541
July	1st to 10th	Day	7% 5% 2 7% 5% 5% 6% 5% 7% 9% 41%	4120
	11th to 20th	Day	9% 4 2 6% 6% 5% 6% 5% 9% 11% 35%	4120
	21st to end	Day	13% 8% 4 9% 7% 6% 6% 5% 7% 8% 27%	4466
August	1st to 10th	Day	14% 6% 2 7% 6% 5% 6% 5% 8% 10% 31%	4104
	11th to 20th	Day	10% 5% 2 7% 5% 6% 6% 6% 7% 9% 37%	4044
	21st to end	Day	8% 5% 2 6% 4 5% 5% 4 6% 10% 45%	4190
September	1st to 10th	Day	14% 5% 2 6% 4 4 4 3 4 7% 46%	2280
	11th to 20th	Day	15% 7% 2 7% 4 4 4 3 5% 7% 42%	2114
	21st to end	Day	23% 7% 2 6% 4 4 4 4 6% 6% 35%	2072
October	1st to 10th	Day	15% 6% 2 7% 5% 4 4 2 4 6% 46%	1900
	11th to 20th	Day	15% 6% 2 5% 4 4 3 3 4 7% 49%	1900
	21st to end	Day	16% 5% 2 6% 3 3 3 3 4 7% 48%	2090
November	1st to 10th	Day	12% 6% 2 5% 4 3 2 3 5% 5% 54%	1927
	11th to 20th	Day	13% 6% 2 5% 3 3 4 4 5% 6% 49%	1736
	21st to end	Day	14% 6% 2 5% 3 3 4 3 5% 7% 49%	1520
December	1st to 10th	Day	18% 9% 3 6% 4 4 4 4 6% 5% 37%	1520
	11th to 20th	Day	15% 5% 1 4 3 4 3 3 4 7% 50%	1910
	21st to end	Day	21% 5% 2 6% 5% 4 6% 5% 7% 7% 32%	3009
January	1st to 10th	Night	12% 9% 2 5% 5% 5% 4 4 5% 7% 42%	4109
	11th to 20th	Night	16% 8% 2 7% 4 3 4 3 5% 5% 44%	4120
	21st to end	Night	22% 8% 2 5% 3 4 3 3 4 5% 41%	4532
February	1st to 10th	Night	12% 8% 3 6% 4 4 4 4 6% 7% 42%	2470
	11th to 20th	Night	18% 7% 2 6% 5% 3 4 4 6% 6% 39%	2403
	21st to end	Night	16% 7% 3 6% 4 4 5% 4 5% 7% 39%	1799
March	1st to 10th	Night	23% 8% 3 6% 4 4 4 4 5% 5% 34%	3418
	11th to 20th	Night	11% 6% 2 6% 4 3 4 4 5% 7% 48%	3480
	21st to end	Night	16% 6% 2 5% 4 3 3 3 4 6% 47%	3817
April	1st to 10th	Night	15% 6% 2 6% 4 4 4 4 5% 7% 43%	1986
	11th to 20th	Night	13% 5% 2 5% 3 4 3 4 6% 8% 47%	1875
	21st to end	Night	15% 5% 2 5% 5% 4 5% 4 6% 6% 43%	1810
May	1st to 10th	Night	20% 8% 3 7% 5% 4 4 3 5% 7% 33%	2813
	11th to 20th	Night	25% 7% 2 7% 5% 4 3 4 5% 6% 33%	2812
	21st to end	Night	11% 5% 2 6% 4 4 4 4 7% 10% 43%	3079
June	1st to 10th	Night	9% 4 2 6% 4 4 4 5% 7% 11% 43%	1549
	11th to 20th	Night	10% 4 1 6% 5% 4 5% 4 6% 9% 45%	1520
	21st to end	Night	9% 4 2 4 4 4 5% 4 7% 9% 47%	1629
July	1st to 10th	Night	6% 5% 1 6% 4 5% 5% 4 8% 11% 44%	2840
	11th to 20th	Night	9% 6% 2 6% 5% 5% 5% 5% 8% 11% 38%	2840
	21st to end	Night	13% 9% 3 9% 6% 5% 5% 4 7% 8% 30%	3087
August	1st to 10th	Night	17% 6% 3 6% 5% 5% 6% 4 6% 10% 32%	2825
	11th to 20th	Night	12% 6% 2 7% 5% 5% 5% 5% 6% 8% 38%	2785
	21st to end	Night	9% 6% 2 5% 4 4 5% 4 6% 9% 45%	3434
September	1st to 10th	Night	12% 5% 2 7% 4 3 4 3 5% 7% 48%	1900
	11th to 20th	Night	16% 6% 2 5% 4 4 5% 4 4 7% 43%	2061
	21st to end	Night	22% 7% 2 5% 4 4 3 4 5% 7% 37%	2107
October	1st to 10th	Night	16% 6% 2 5% 3 4 3 4 5% 6% 46%	2280
	11th to 20th	Night	14% 5% 2 5% 4 3 5% 3 5% 6% 49%	2280
	21st to end	Night	15% 4 2 4 4 3 4 3 4 6% 52%	2508
November	1st to 10th	Night	13% 7% 3 4 3 3 4 2 4 5% 52%	2312
	11th to 20th	Night	13% 5% 2 5% 3 3 4 4 5% 6% 50%	2439
	21st to end	Night	14% 6% 2 4 4 3 4 3 5% 7% 48%	2660
December	1st to 10th	Night	18% 9% 3 6% 4 4 4 3 4 6% 40%	2660
	11th to 20th	Night	14% 7% 2 5% 5% 4 5% 4 5% 6% 42%	3285
	21st to end	Night	17% 5% 2 7% 5% 5% 6% 5% 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% 2 5% 25% 17% 6%	2837
	11th to 20th	Day	52% 1 6% 19% 18% 5%	2840
	21st to end	Day	50% 1 6% 23% 17% 3	3124
February	1st to 10th	Day	45% 2 10% 24% 15% 3	1710
	11th to 20th	Day	46% 2 9% 21% 18% 4	1672
	21st to end	Day	48% 3 10% 18% 17% 5%	1651
March	1st to 10th	Day	50% 2 8% 22% 13% 5%	3435
	11th to 20th	Day	36% 2 7% 28% 20% 7%	3480
	21st to end	Day	50% 2 9% 20% 15% 3	3815
April	1st to 10th	Day	39% 3 11% 22% 18% 8%	2194
	11th to 20th	Day	40% 2 11% 23% 20% 5%	2254
	21st to end	Day	46% 3 11% 23% 13% 4	2385
May	1st to 10th	Day	54% 3 11% 21% 10% 2	4120
	11th to 20th	Day	52% 3 11% 23% 9% 2	4085
	21st to end	Day	39% 3 17% 22% 17% 3	4489
June	1st to 10th	Day	40% 4 15% 27% 14% 1	2622
	11th to 20th	Day	41% 5% 16% 22% 15% 1	2660
	21st to end	Day	38% 7% 15% 26% 13% 2	2541
July	1st to 10th	Day	38% 8% 19% 20% 9% 6%	4055
	11th to 20th	Day	38% 8% 19% 25% 10% 1	4051
	21st to end	Day	52% 6% 12% 20% 9% 1	4324
August	1st to 10th	Day	45% 7% 18% 23% 7%	4091
	11th to 20th	Day	39% 7% 14% 28% 13% 1	4083
	21st to end	Day	33% 6% 18% 28% 13% 1	4190
September	1st to 10th	Day	39% 5% 12% 19% 21% 4	2280
	11th to 20th	Day	42% 3 6% 26% 19% 3	2114
	21st to end	Day	50% 3 7% 21% 17% 2	2072
October	1st to 10th	Day	35% 4 7% 21% 26% 8%	3160
	11th to 20th	Day	26% 3 9% 26% 23% 14%	3140
	21st to end	Day	24% 3 9% 30% 20% 13%	3428
November	1st to 10th	Day	34% 2 9% 24% 27% 5%	1927
	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	43% 2 6% 24% 22% 4	4109
	11th to 20th	Night	43% 2 7% 24% 19% 5%	4120
	21st to end	Night	48% 1 5% 26% 15% 4	4532
February	1st to 10th	Night	42% 2 11% 26% 17% 2	2470
	11th to 20th	Night	45% 3 8% 21% 17% 6%	2405
	21st to end	Night	46% 3 10% 23% 13% 5%	1799
March	1st to 10th	Night	53% 2 7% 21% 14% 3	3418
	11th to 20th	Night	37% 2 6% 24% 26% 5%	3480
	21st to end	Night	41% 2 10% 23% 19% 4	3817
April	1st to 10th	Night	41% 4 12% 19% 19% 5%	1986
	11th to 20th	Night	36% 3 13% 22% 20% 5%	1875
	21st to end	Night	41% 4 11% 26% 15% 3	1810
May	1st to 10th	Night	52% 3 13% 20% 11% 2	2840
	11th to 20th	Night	53% 3 10% 24% 9% 1	2813
	21st to end	Night	38% 4 18% 27% 9% 4	3087
June	1st to 10th	Night	35% 7% 14% 28% 15% 1	1549
	11th to 20th	Night	37% 5% 18% 25% 12% 2	1520
	21st to end	Night	32% 8% 17% 25% 17% 2	1629
July	1st to 10th	Night	33% 10% 21% 20% 14% 3	2795
	11th to 20th	Night	37% 10% 19% 24% 9% 1	2786
	21st to end	Night	49% 8% 15% 20% 8%	2988
August	1st to 10th	Night	47% 7% 18% 22% 6%	2814
	11th to 20th	Night	42% 6% 16% 24% 12% 1	2812
	21st to end	Night	34% 6% 19% 30% 9% 2	3434
September	1st to 10th	Night	36% 5% 15% 21% 18% 5%	1900
	11th to 20th	Night	40% 3 9% 26% 18% 3	2061
	21st to end	Night	48% 3 10% 20% 17% 3	2107
October	1st to 10th	Night	39% 5% 9% 20% 21% 6%	3800
	11th to 20th	Night	27% 3 9% 22% 28% 11%	3779
	21st to end	Night	22% 2 11% 29% 27% 10%	4120
November	1st to 10th	Night	37% 2 8% 23% 24% 6%	2312
	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% 25% 13% 4 1	270
	11th to 20th	Day	39% 19% 30% 10% 2	270
	21st to end	Day	33% 25% 25% 13% 3	297
February	1st to 10th	Day	28% 26% 30% 12% 4	270
	11th to 20th	Day	45% 23% 25% 6% 1	270
	21st to end	Day	36% 22% 23% 17% 2	320
March	1st to 10th	Day	28% 21% 23% 22% 6% 1	460
	11th to 20th	Day	27% 25% 23% 20% 5% 1	460
	21st to end	Day	26% 21% 28% 18% 6% 1	506
April	1st to 10th	Day	23% 24% 25% 18% 9% 1	460
	11th to 20th	Day	23% 17% 25% 19% 12% 4	452
	21st to end	Day	28% 14% 28% 17% 11% 3	460
May	1st to 10th	Day	26% 17% 27% 19% 8% 4	463
	11th to 20th	Day	24% 12% 26% 20% 13% 6%	487
	21st to end	Day	16% 9% 24% 23% 18% 9%	529
June	1st to 10th	Day	13% 11% 27% 26% 17% 7%	490
	11th to 20th	Day	15% 8% 23% 28% 17% 9%	490
	21st to end	Day	11% 9% 29% 29% 15% 8%	490
July	1st to 10th	Day	12% 4 19% 30% 22% 14%	485
	11th to 20th	Day	6% 4 18% 34% 26% 12%	484
	21st to end	Day	14% 5% 21% 28% 22% 11%	532
August	1st to 10th	Day	16% 5% 21% 23% 22% 14%	486
	11th to 20th	Day	13% 4 21% 27% 23% 13%	479
	21st to end	Day	13% 3 15% 29% 23% 16%	539
September	1st to 10th	Day	14% 7% 16% 28% 22% 14%	490
	11th to 20th	Day	15% 3 19% 30% 23% 10%	490
	21st to end	Day	29% 10% 19% 23% 15% 4	490
October	1st to 10th	Day	20% 8% 22% 28% 18% 4	490
	11th to 20th	Day	18% 14% 23% 28% 16% 3	490
	21st to end	Day	20% 14% 27% 25% 11% 2	539
November	1st to 10th	Day	21% 12% 24% 29% 12% 2	483
	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% 14% 27% 31% 4	760
	21st to end	Night	20% 15% 35% 27% 3	836
February	1st to 10th	Night	19% 17% 28% 34% 2	760
	11th to 20th	Night	26% 19% 31% 23% 1	743
	21st to end	Night	24% 15% 35% 24% 2	628
March	1st to 10th	Night	20% 14% 30% 30% 5%	760
	11th to 20th	Night	24% 15% 30% 24% 7% 1	760
	21st to end	Night	19% 14% 30% 30% 7% 1	836
April	1st to 10th	Night	19% 16% 31% 27% 6%	760
	11th to 20th	Night	17% 15% 26% 30% 12%	751
	21st to end	Night	19% 8% 27% 35% 10% 1	670
May	1st to 10th	Night	15% 10% 22% 34% 17% 2	570
	11th to 20th	Night	21% 4 21% 38% 14% 1	561
	21st to end	Night	16% 2 12% 35% 30% 5%	617
June	1st to 10th	Night	9% 2 12% 44% 31% 2	409
	11th to 20th	Night	10% 3 11% 44% 30% 2	380
	21st to end	Night	10% 3 13% 45% 25% 4	489
July	1st to 10th	Night	12% 2 7% 38% 34% 6%	555
	11th to 20th	Night	6% 1 6% 36% 46% 4	552
	21st to end	Night	8% 2 8% 39% 38% 5%	624
August	1st to 10th	Night	15% 2 7% 36% 36% 4	567
	11th to 20th	Night	14% 2 8% 33% 37% 5%	564
	21st to end	Night	12% 2 11% 32% 38% 6%	807
September	1st to 10th	Night	13% 2 11% 35% 34% 6%	760
	11th to 20th	Night	18% 3 11% 34% 29% 5%	760
	21st to end	Night	23% 5% 17% 33% 21% 2	760
October	1st to 10th	Night	17% 7% 17% 32% 23% 4	760
	11th to 20th	Night	15% 10% 23% 34% 17% 1	760
	21st to end	Night	17% 10% 23% 36% 13% 2	836
November	1st to 10th	Night	17% 8% 23% 37% 13% 2	771
	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

Page generated at 2024-11-05 08:15:54. Version ac07

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