Stoutsville
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Stoutsville clear sky chart from 2005-11-06 to 2024-04-10.

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	12% 8% 3 6% 5% 3 4 4 5% 7% 42%	83256
	Night	13% 8% 3 6% 5% 3 4 4 5% 6% 42%	85590
Transparency	Day	42% 5% 12% 24% 15% 2	82968
	Night	43% 4 10% 24% 16% 3	85398
Seeing	Day	15% 7% 25% 28% 19% 6%	14812
	Night	16% 8% 30% 31% 14% 1	24851

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	11% 12% 4 12% 7% 3 4 5% 5% 6% 32%	2527
	11th to 20th	Day	12% 11% 5% 7% 7% 5% 7% 3 5% 5% 33%	2827
	21st to end	Day	17% 16% 7% 10% 6% 3 3 4 4 5% 26%	3135
February	1st to 10th	Day	15% 10% 5% 8% 6% 4 4 4 4 7% 34%	1710
	11th to 20th	Day	13% 10% 3 6% 5% 4 5% 5% 5% 6% 38%	1725
	21st to end	Day	14% 12% 4 5% 5% 3 4 4 5% 7% 38%	1570
March	1st to 10th	Day	17% 10% 4 5% 5% 2 3 3 4 6% 43%	3331
	11th to 20th	Day	11% 6% 2 5% 5% 3 3 4 5% 7% 48%	3480
	21st to end	Day	18% 12% 4 7% 7% 3 4 4 4 6% 30%	3908
April	1st to 10th	Day	14% 8% 3 6% 6% 3 5% 4 4 6% 42%	2269
	11th to 20th	Day	16% 7% 3 7% 5% 3 4 4 4 6% 40%	2134
	21st to end	Day	19% 7% 3 6% 5% 3 4 4 5% 7% 36%	2160
May	1st to 10th	Day	15% 8% 3 6% 6% 4 5% 5% 6% 9% 33%	2276
	11th to 20th	Day	16% 7% 3 6% 5% 3 5% 4 5% 7% 39%	2464
	21st to end	Day	12% 6% 3 7% 7% 4 5% 5% 6% 8% 38%	2725
June	1st to 10th	Day	6% 4 2 5% 5% 3 6% 5% 6% 9% 48%	2520
	11th to 20th	Day	7% 5% 2 5% 5% 3 5% 6% 5% 9% 48%	2520
	21st to end	Day	7% 5% 2 5% 6% 3 5% 6% 6% 9% 46%	2520
July	1st to 10th	Day	9% 4 2 4 5% 4 5% 6% 7% 9% 45%	2520
	11th to 20th	Day	6% 3 2 5% 6% 3 5% 5% 7% 9% 49%	2512
	21st to end	Day	8% 4 2 5% 5% 3 6% 5% 6% 10% 46%	2546
August	1st to 10th	Day	7% 5% 3 6% 6% 4 5% 4 6% 11% 43%	2328
	11th to 20th	Day	8% 5% 2 5% 5% 3 5% 5% 5% 10% 47%	2219
	21st to end	Day	9% 4 2 4 4 3 4 5% 6% 8% 52%	2376
September	1st to 10th	Day	10% 6% 2 5% 4 3 4 4 5% 8% 50%	2160
	11th to 20th	Day	10% 4 2 4 4 3 3 3 5% 7% 55%	2160
	21st to end	Day	7% 4 2 4 5% 2 3 6% 6% 8% 53%	1905
October	1st to 10th	Day	12% 4 2 5% 4 3 4 4 5% 6% 51%	1800
	11th to 20th	Day	15% 6% 2 4 4 2 3 3 5% 6% 49%	1800
	21st to end	Day	18% 8% 2 5% 5% 3 3 3 4 6% 44%	1980
November	1st to 10th	Day	10% 7% 3 5% 3 2 4 4 4 7% 53%	1718
	11th to 20th	Day	15% 7% 3 5% 4 3 3 4 4 7% 46%	1690
	21st to end	Day	16% 10% 4 7% 4 2 4 4 4 5% 41%	1520
December	1st to 10th	Day	12% 9% 5% 7% 5% 2 5% 3 5% 6% 41%	1520
	11th to 20th	Day	14% 8% 3 6% 5% 3 4 5% 5% 6% 40%	1918
	21st to end	Day	19% 15% 5% 10% 6% 3 5% 5% 4 5% 23%	2783
January	1st to 10th	Night	12% 11% 7% 10% 8% 3 4 4 4 4 33%	4428
	11th to 20th	Night	13% 14% 5% 9% 5% 3 7% 6% 6% 5% 27%	4139
	21st to end	Night	19% 16% 5% 8% 5% 3 4 4 4 6% 26%	4532
February	1st to 10th	Night	14% 11% 5% 7% 6% 4 4 5% 4 6% 35%	2470
	11th to 20th	Night	15% 8% 3 6% 5% 3 4 4 4 6% 42%	2341
	21st to end	Night	15% 9% 3 6% 5% 2 3 3 4 4 45%	1884
March	1st to 10th	Night	18% 11% 3 5% 4 3 3 3 3 5% 43%	3551
	11th to 20th	Night	13% 6% 2 5% 4 3 4 3 4 5% 50%	3480
	21st to end	Night	19% 11% 4 7% 7% 3 4 5% 5% 7% 29%	3722
April	1st to 10th	Night	12% 6% 3 5% 4 2 5% 5% 4 8% 46%	1900
	11th to 20th	Night	13% 6% 3 5% 5% 3 5% 4 3 7% 46%	1775
	21st to end	Night	18% 7% 2 6% 5% 3 5% 4 4 6% 40%	1800
May	1st to 10th	Night	14% 6% 2 6% 5% 3 4 6% 5% 8% 40%	1682
	11th to 20th	Night	15% 6% 3 6% 5% 3 5% 4 5% 6% 42%	1430
	21st to end	Night	11% 6% 3 6% 6% 3 4 5% 6% 10% 40%	1551
June	1st to 10th	Night	6% 3 2 3 4 2 5% 5% 7% 8% 55%	1440
	11th to 20th	Night	6% 5% 2 5% 6% 4 4 4 6% 9% 49%	1440
	21st to end	Night	4 3 2 5% 4 2 5% 5% 6% 11% 52%	1440
July	1st to 10th	Night	8% 4 2 4 4 3 4 5% 7% 9% 50%	1440
	11th to 20th	Night	6% 4 2 4 3 2 4 4 7% 8% 56%	1444
	21st to end	Night	7% 4 2 4 4 2 5% 6% 6% 10% 52%	1772
August	1st to 10th	Night	7% 3 2 2 5% 3 5% 5% 7% 10% 51%	1611
	11th to 20th	Night	7% 5% 2 5% 4 3 5% 4 5% 6% 55%	1679
	21st to end	Night	5% 3 2 4 4 3 4 4 6% 9% 57%	1980
September	1st to 10th	Night	10% 5% 2 3 4 2 4 4 4 7% 57%	1800
	11th to 20th	Night	8% 6% 2 4 4 3 5% 4 5% 8% 52%	1800
	21st to end	Night	7% 4 2 4 4 3 4 5% 5% 6% 56%	2034
October	1st to 10th	Night	9% 5% 2 4 3 2 4 4 5% 6% 56%	2160
	11th to 20th	Night	13% 5% 2 4 4 3 4 4 4 6% 52%	2160
	21st to end	Night	17% 8% 2 4 4 3 3 4 5% 5% 46%	2376
November	1st to 10th	Night	11% 5% 2 4 4 2 3 3 4 7% 56%	2357
	11th to 20th	Night	13% 5% 2 6% 5% 3 4 3 4 7% 48%	2489
	21st to end	Night	17% 8% 3 5% 4 3 3 4 4 6% 44%	2660
December	1st to 10th	Night	14% 9% 4 7% 5% 3 4 5% 5% 6% 38%	2660
	11th to 20th	Night	14% 8% 4 7% 4 2 3 5% 5% 7% 41%	3279
	21st to end	Night	19% 18% 7% 9% 7% 3 4 4 3 4 22%	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	52% 5% 10% 23% 9% 1	2528
	11th to 20th	Day	55% 3 14% 19% 9%	2827
	21st to end	Day	61% 4 10% 14% 10% 1	3135
February	1st to 10th	Day	52% 4 11% 20% 11% 2	1710
	11th to 20th	Day	46% 5% 12% 20% 15% 2	1734
	21st to end	Day	47% 4 9% 24% 13% 3	1570
March	1st to 10th	Day	45% 3 9% 23% 18% 2	3331
	11th to 20th	Day	35% 4 13% 27% 17% 3	3480
	21st to end	Day	54% 4 17% 18% 6% 1	3908
April	1st to 10th	Day	43% 4 11% 27% 14% 1	2269
	11th to 20th	Day	45% 3 10% 26% 13% 2	2134
	21st to end	Day	46% 5% 14% 21% 13% 1	2160
May	1st to 10th	Day	47% 6% 14% 22% 10%	2276
	11th to 20th	Day	45% 5% 12% 25% 12% 1	2468
	21st to end	Day	44% 6% 12% 20% 16% 2	2725
June	1st to 10th	Day	31% 5% 16% 31% 15% 2	2520
	11th to 20th	Day	32% 6% 14% 24% 20% 4	2520
	21st to end	Day	33% 6% 16% 26% 15% 4	2520
July	1st to 10th	Day	33% 6% 15% 27% 15% 4	2451
	11th to 20th	Day	29% 6% 18% 27% 18% 3	2437
	21st to end	Day	33% 6% 13% 32% 15% 2	2405
August	1st to 10th	Day	35% 6% 17% 29% 12% 1	2314
	11th to 20th	Day	33% 5% 13% 30% 18% 1	2219
	21st to end	Day	29% 6% 13% 25% 21% 6%	2376
September	1st to 10th	Day	34% 4 11% 26% 19% 6%	2160
	11th to 20th	Day	29% 4 9% 30% 22% 5%	2160
	21st to end	Day	29% 5% 10% 28% 24% 4	1905
October	1st to 10th	Day	35% 3 10% 27% 23% 3	1800
	11th to 20th	Day	37% 4 8% 25% 23% 4	1800
	21st to end	Day	43% 3 9% 24% 18% 3	1980
November	1st to 10th	Day	33% 3 12% 24% 22% 5%	1718
	11th to 20th	Day	39% 4 10% 24% 20% 3	1690
	21st to end	Day	47% 4 9% 26% 13% 1	1520
December	1st to 10th	Day	45% 3 13% 24% 13% 1	1520
	11th to 20th	Day	45% 4 13% 26% 12% 2	1915
	21st to end	Day	63% 5% 9% 16% 6% 1	2783
January	1st to 10th	Night	55% 4 9% 23% 9% 1	4428
	11th to 20th	Night	57% 5% 9% 18% 10% 1	4139
	21st to end	Night	62% 3 9% 19% 7% 1	4532
February	1st to 10th	Night	52% 3 11% 20% 11% 3	2470
	11th to 20th	Night	45% 4 10% 23% 16% 2	2342
	21st to end	Night	44% 3 10% 24% 15% 4	1884
March	1st to 10th	Night	46% 3 8% 23% 18% 2	3551
	11th to 20th	Night	37% 3 8% 26% 21% 4	3480
	21st to end	Night	55% 5% 11% 23% 5%	3722
April	1st to 10th	Night	38% 4 11% 27% 17% 4	1900
	11th to 20th	Night	40% 3 9% 26% 17% 5%	1775
	21st to end	Night	45% 5% 10% 21% 18% 2	1800
May	1st to 10th	Night	41% 6% 16% 20% 16% 1	1682
	11th to 20th	Night	43% 6% 12% 21% 18% 1	1431
	21st to end	Night	41% 5% 12% 23% 16% 3	1552
June	1st to 10th	Night	26% 5% 17% 31% 18% 3	1440
	11th to 20th	Night	32% 6% 11% 24% 23% 4	1440
	21st to end	Night	25% 5% 17% 29% 19% 5%	1440
July	1st to 10th	Night	31% 5% 13% 32% 15% 4	1400
	11th to 20th	Night	26% 4 11% 34% 22% 3	1396
	21st to end	Night	25% 6% 13% 32% 21% 2	1673
August	1st to 10th	Night	28% 5% 16% 33% 16% 2	1601
	11th to 20th	Night	29% 4 11% 32% 22% 2	1679
	21st to end	Night	24% 6% 13% 28% 22% 8%	1980
September	1st to 10th	Night	29% 3 12% 25% 25% 6%	1800
	11th to 20th	Night	30% 5% 10% 26% 23% 6%	1800
	21st to end	Night	29% 4 8% 29% 26% 4	2034
October	1st to 10th	Night	28% 3 11% 26% 26% 5%	2160
	11th to 20th	Night	35% 4 7% 28% 21% 6%	2160
	21st to end	Night	42% 3 8% 22% 22% 3	2376
November	1st to 10th	Night	30% 4 12% 28% 21% 5%	2357
	11th to 20th	Night	37% 3 9% 27% 20% 3	2489
	21st to end	Night	44% 3 10% 26% 16% 2	2660
December	1st to 10th	Night	48% 4 12% 24% 11% 1	2660
	11th to 20th	Night	45% 3 12% 24% 15% 1	3281
	21st to end	Night	67% 3 8% 14% 7% 1	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	21% 14% 33% 25% 7%	270
	11th to 20th	Day	27% 12% 38% 21% 1	270
	21st to end	Day	17% 14% 40% 22% 6%	297
February	1st to 10th	Day	27% 11% 40% 16% 6%	270
	11th to 20th	Day	21% 14% 37% 21% 7%	270
	21st to end	Day	22% 13% 44% 17% 5%	225
March	1st to 10th	Day	17% 14% 42% 24% 2	270
	11th to 20th	Day	24% 12% 31% 23% 8% 1	270
	21st to end	Day	31% 12% 28% 23% 5% 1	353
April	1st to 10th	Day	19% 13% 36% 22% 9% 2	457
	11th to 20th	Day	21% 9% 33% 26% 8% 2	412
	21st to end	Day	23% 7% 34% 26% 10% 1	420
May	1st to 10th	Day	19% 9% 32% 27% 11% 3	539
	11th to 20th	Day	18% 8% 25% 29% 16% 4	625
	21st to end	Day	14% 3 27% 28% 20% 8%	679
June	1st to 10th	Day	6% 3 17% 35% 28% 12%	630
	11th to 20th	Day	10% 2 19% 37% 27% 6%	630
	21st to end	Day	8% 3 25% 34% 24% 5%	630
July	1st to 10th	Day	11% 1 11% 29% 33% 14%	621
	11th to 20th	Day	8% 2 15% 37% 28% 10%	618
	21st to end	Day	10% 1 13% 32% 35% 9%	684
August	1st to 10th	Day	8% 1 11% 38% 32% 10%	626
	11th to 20th	Day	9% 2 14% 30% 34% 11%	533
	21st to end	Day	10% 1 11% 33% 32% 13%	495
September	1st to 10th	Day	13% 3 14% 29% 30% 11%	450
	11th to 20th	Day	7% 2 14% 36% 26% 15%	450
	21st to end	Day	7% 5% 22% 29% 26% 10%	334
October	1st to 10th	Day	14% 5% 24% 34% 16% 7%	270
	11th to 20th	Day	16% 17% 33% 23% 11%	270
	21st to end	Day	28% 11% 32% 20% 8%	297
November	1st to 10th	Day	11% 6% 37% 30% 13% 4	270
	11th to 20th	Day	19% 16% 29% 26% 10% 1	270
	21st to end	Day	23% 13% 32% 25% 6%	270
December	1st to 10th	Day	13% 11% 43% 20% 9% 4	270
	11th to 20th	Day	19% 12% 37% 24% 7%	270
	21st to end	Day	26% 18% 38% 17% 2	297
January	1st to 10th	Night	16% 12% 42% 24% 6%	950
	11th to 20th	Night	18% 15% 38% 24% 5%	950
	21st to end	Night	18% 10% 41% 28% 3	1045
February	1st to 10th	Night	20% 12% 39% 26% 4	950
	11th to 20th	Night	20% 12% 37% 28% 3	867
	21st to end	Night	22% 14% 39% 21% 4	628
March	1st to 10th	Night	19% 11% 40% 27% 4	656
	11th to 20th	Night	21% 9% 33% 28% 8%	570
	21st to end	Night	27% 10% 31% 26% 6%	627
April	1st to 10th	Night	16% 12% 38% 28% 6%	570
	11th to 20th	Night	16% 9% 35% 31% 9% 1	533
	21st to end	Night	23% 5% 33% 32% 7%	540
May	1st to 10th	Night	18% 6% 29% 35% 12% 1	540
	11th to 20th	Night	18% 4 24% 36% 17% 1	531
	21st to end	Night	12% 3 23% 35% 23% 3	584
June	1st to 10th	Night	8% 2 16% 43% 29% 2	540
	11th to 20th	Night	9% 2 19% 41% 27% 2	540
	21st to end	Night	5% 3 21% 47% 23% 2	540
July	1st to 10th	Night	9% 2 8% 35% 40% 6%	525
	11th to 20th	Night	9% 1 12% 41% 31% 5%	522
	21st to end	Night	8% 10% 42% 36% 3	591
August	1st to 10th	Night	8% 1 8% 42% 38% 3	537
	11th to 20th	Night	8% 1 9% 42% 34% 5%	534
	21st to end	Night	6% 1 10% 39% 41% 3	594
September	1st to 10th	Night	13% 2 14% 37% 29% 5%	540
	11th to 20th	Night	11% 2 17% 36% 28% 6%	540
	21st to end	Night	10% 5% 22% 34% 23% 5%	661
October	1st to 10th	Night	12% 4 25% 34% 22% 4	720
	11th to 20th	Night	16% 10% 33% 31% 10% 1	720
	21st to end	Night	22% 9% 34% 26% 8% 1	792
November	1st to 10th	Night	13% 8% 37% 32% 9%	740
	11th to 20th	Night	15% 13% 39% 26% 6%	779
	21st to end	Night	23% 10% 37% 25% 6%	950
December	1st to 10th	Night	19% 11% 39% 25% 6%	950
	11th to 20th	Night	22% 8% 33% 29% 7%	950
	21st to end	Night	23% 14% 35% 25% 3	1045

Page generated at 2024-04-07 08:28:16. Version ac07

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