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 2024-11-04.

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	12% 8% 3 7% 4 4 4 4 5% 7% 42%	101327
	Night	12% 8% 3 7% 4 4 4 3 5% 7% 43%	97786
Transparency	Day	40% 4 12% 25% 17% 2	104965
	Night	40% 4 11% 25% 18% 3	102288
Seeing	Day	15% 7% 26% 29% 18% 6%	15706
	Night	16% 8% 30% 31% 14% 1	25516

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 13% 5% 4 4 4 5% 6% 32%	2527
	11th to 20th	Day	12% 12% 4 8% 6% 7% 6% 2 5% 5% 32%	2827
	21st to end	Day	17% 16% 7% 11% 5% 4 3 3 4 5% 26%	3135
February	1st to 10th	Day	15% 11% 4 8% 5% 5% 4 4 4 7% 33%	1710
	11th to 20th	Day	13% 10% 3 7% 4 5% 5% 3 6% 6% 37%	1725
	21st to end	Day	14% 12% 4 5% 4 4 4 4 5% 6% 38%	1570
March	1st to 10th	Day	17% 10% 3 6% 4 3 3 3 4 6% 43%	3331
	11th to 20th	Day	10% 6% 2 6% 4 4 4 4 5% 7% 47%	3480
	21st to end	Day	18% 13% 4 8% 6% 4 4 4 4 6% 30%	3908
April	1st to 10th	Day	14% 9% 3 7% 5% 4 5% 3 4 6% 41%	2280
	11th to 20th	Day	15% 8% 3 8% 4 4 4 4 5% 6% 41%	2254
	21st to end	Day	18% 8% 3 7% 4 4 4 3 6% 7% 36%	2280
May	1st to 10th	Day	11% 8% 3 7% 5% 5% 5% 5% 7% 10% 34%	3978
	11th to 20th	Day	16% 8% 3 7% 4 4 4 3 5% 7% 39%	4384
	21st to end	Day	11% 6% 2 6% 5% 4 4 3 5% 7% 47%	4824
June	1st to 10th	Day	6% 4 2 6% 4 5% 5% 4 6% 9% 48%	2660
	11th to 20th	Day	7% 5% 2 5% 5% 4 5% 5% 5% 10% 48%	2660
	21st to end	Day	7% 5% 2 6% 5% 5% 5% 5% 6% 10% 45%	2660
July	1st to 10th	Day	12% 6% 3 6% 5% 5% 5% 5% 7% 9% 39%	4440
	11th to 20th	Day	5% 4 2 6% 4 4 5% 4 7% 9% 50%	4418
	21st to end	Day	7% 5% 2 6% 5% 6% 6% 5% 7% 11% 39%	4465
August	1st to 10th	Day	4 4 2 5% 4 5% 5% 4 7% 11% 49%	4104
	11th to 20th	Day	13% 6% 2 5% 3 4 4 4 5% 9% 46%	3889
	21st to end	Day	6% 4 2 5% 4 4 5% 4 6% 9% 52%	4180
September	1st to 10th	Day	10% 5% 2 5% 3 4 4 3 5% 7% 52%	2280
	11th to 20th	Day	10% 4 2 5% 4 4 3 2 5% 7% 54%	2280
	21st to end	Day	8% 5% 2 5% 4 3 3 4 6% 8% 51%	2010
October	1st to 10th	Day	11% 4 2 6% 3 4 3 3 5% 5% 54%	1900
	11th to 20th	Day	14% 6% 2 5% 4 2 3 3 5% 6% 51%	1900
	21st to end	Day	17% 8% 2 6% 4 3 3 3 4 6% 45%	2090
November	1st to 10th	Day	10% 7% 2 5% 2 3 3 3 4 6% 53%	1747
	11th to 20th	Day	15% 7% 2 6% 3 3 3 3 5% 7% 45%	1690
	21st to end	Day	16% 11% 3 7% 4 3 4 3 4 5% 40%	1520
December	1st to 10th	Day	12% 10% 5% 8% 5% 3 4 3 5% 6% 40%	1520
	11th to 20th	Day	14% 9% 3 7% 4 4 4 4 6% 6% 39%	1918
	21st to end	Day	19% 15% 5% 11% 5% 4 5% 3 5% 5% 23%	2783
January	1st to 10th	Night	12% 11% 7% 12% 6% 4 4 3 4 4 33%	4428
	11th to 20th	Night	12% 15% 5% 9% 4 5% 6% 5% 6% 5% 27%	4139
	21st to end	Night	19% 17% 5% 9% 4 4 4 3 4 6% 26%	4532
February	1st to 10th	Night	14% 12% 4 7% 6% 4 4 3 4 6% 35%	2470
	11th to 20th	Night	15% 9% 2 7% 4 4 4 3 5% 6% 42%	2341
	21st to end	Night	15% 9% 3 7% 4 3 3 2 5% 4 44%	1884
March	1st to 10th	Night	18% 11% 3 6% 4 3 3 2 4 5% 42%	3551
	11th to 20th	Night	13% 7% 2 6% 3 3 4 2 4 5% 50%	3480
	21st to end	Night	19% 11% 4 8% 6% 4 4 3 5% 7% 29%	3722
April	1st to 10th	Night	12% 6% 3 6% 3 4 4 4 5% 7% 45%	1900
	11th to 20th	Night	13% 7% 2 6% 4 4 4 3 3 7% 46%	1875
	21st to end	Night	17% 7% 3 7% 4 4 4 3 4 5% 40%	1900
May	1st to 10th	Night	16% 8% 2 7% 4 4 5% 4 6% 8% 36%	2922
	11th to 20th	Night	12% 8% 3 7% 4 4 5% 3 6% 8% 41%	2520
	21st to end	Night	8% 5% 2 6% 4 3 3 4 6% 10% 49%	2743
June	1st to 10th	Night	7% 4 2 4 4 4 4 4 7% 8% 54%	1520
	11th to 20th	Night	6% 5% 2 6% 5% 5% 4 3 6% 10% 49%	1520
	21st to end	Night	4 4 2 6% 3 4 4 4 7% 10% 52%	1520
July	1st to 10th	Night	10% 7% 3 6% 4 5% 4 4 6% 9% 42%	2530
	11th to 20th	Night	4 3 2 4 3 3 4 4 6% 9% 58%	2548
	21st to end	Night	6% 5% 2 5% 4 4 5% 5% 7% 11% 43%	3098
August	1st to 10th	Night	4 2 1 3 3 4 4 4 6% 10% 60%	2836
	11th to 20th	Night	10% 5% 2 5% 3 4 4 3 5% 7% 51%	2942
	21st to end	Night	3 3 2 5% 3 4 4 3 7% 10% 57%	3476
September	1st to 10th	Night	10% 5% 1 3 3 3 3 3 4 7% 58%	1900
	11th to 20th	Night	8% 6% 2 5% 3 3 5% 3 6% 8% 51%	1900
	21st to end	Night	7% 5% 2 5% 4 4 4 3 5% 6% 54%	2148
October	1st to 10th	Night	9% 5% 2 4 2 2 4 3 5% 7% 57%	2280
	11th to 20th	Night	12% 5% 2 5% 4 3 3 3 4 5% 54%	2280
	21st to end	Night	16% 8% 2 5% 4 4 3 3 5% 5% 46%	2508
November	1st to 10th	Night	10% 5% 2 5% 3 2 3 2 4 7% 56%	2401
	11th to 20th	Night	13% 6% 2 6% 4 4 3 2 5% 7% 48%	2489
	21st to end	Night	16% 9% 2 6% 3 3 3 3 5% 5% 44%	2660
December	1st to 10th	Night	14% 10% 3 8% 5% 4 4 4 5% 6% 38%	2660
	11th to 20th	Night	14% 9% 4 8% 4 3 3 4 5% 7% 41%	3279
	21st to end	Night	19% 18% 7% 10% 5% 4 3 3 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	2280
	11th to 20th	Day	44% 3 10% 26% 14% 2	2254
	21st to end	Day	46% 5% 13% 21% 13% 1	2280
May	1st to 10th	Day	43% 7% 15% 23% 12%	4014
	11th to 20th	Day	46% 4 11% 28% 10% 1	4388
	21st to end	Day	36% 5% 9% 25% 23% 1	4837
June	1st to 10th	Day	31% 5% 16% 30% 15% 2	2660
	11th to 20th	Day	31% 6% 13% 26% 20% 4	2660
	21st to end	Day	33% 6% 16% 26% 15% 4	2660
July	1st to 10th	Day	41% 5% 12% 25% 15% 2	4371
	11th to 20th	Day	29% 4 16% 30% 20% 2	4343
	21st to end	Day	37% 4 18% 27% 12% 1	4325
August	1st to 10th	Day	28% 5% 15% 38% 13% 1	4090
	11th to 20th	Day	37% 4 13% 28% 18% 1	3928
	21st to end	Day	28% 4 17% 32% 14% 5%	4179
September	1st to 10th	Day	32% 3 11% 25% 22% 6%	2280
	11th to 20th	Day	31% 4 9% 30% 21% 5%	2280
	21st to end	Day	31% 5% 10% 27% 24% 3	2010
October	1st to 10th	Day	21% 2 6% 18% 45% 8%	3160
	11th to 20th	Day	24% 2 6% 22% 37% 10%	3140
	21st to end	Day	39% 3 7% 23% 26% 2	3428
November	1st to 10th	Day	34% 3 12% 24% 22% 5%	1747
	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% 26% 17% 4	1900
	11th to 20th	Night	39% 3 9% 26% 18% 5%	1875
	21st to end	Night	45% 5% 10% 21% 18% 1	1900
May	1st to 10th	Night	44% 6% 15% 20% 14% 1	2951
	11th to 20th	Night	42% 5% 13% 26% 12% 1	2521
	21st to end	Night	32% 5% 12% 23% 25% 3	2751
June	1st to 10th	Night	27% 5% 16% 30% 18% 3	1520
	11th to 20th	Night	31% 6% 12% 25% 23% 4	1520
	21st to end	Night	26% 5% 16% 28% 19% 5%	1520
July	1st to 10th	Night	38% 4 12% 29% 13% 3	2490
	11th to 20th	Night	23% 3 12% 36% 24% 2	2500
	21st to end	Night	33% 5% 19% 28% 14% 1	2999
August	1st to 10th	Night	20% 3 18% 38% 19% 2	2826
	11th to 20th	Night	34% 3 12% 28% 21% 2	2969
	21st to end	Night	23% 4 20% 33% 15% 4	3476
September	1st to 10th	Night	28% 3 11% 25% 26% 8%	1900
	11th to 20th	Night	30% 5% 10% 26% 23% 6%	1900
	21st to end	Night	30% 4 8% 28% 26% 4	2148
October	1st to 10th	Night	18% 2 7% 21% 47% 5%	3800
	11th to 20th	Night	24% 2 7% 22% 34% 10%	3779
	21st to end	Night	38% 2 6% 24% 26% 3	4120
November	1st to 10th	Night	30% 4 13% 27% 21% 5%	2401
	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% 37% 21% 9% 2	460
	11th to 20th	Day	20% 12% 33% 25% 8% 2	452
	21st to end	Day	23% 7% 36% 24% 9% 1	460
May	1st to 10th	Day	18% 8% 32% 27% 11% 3	586
	11th to 20th	Day	18% 7% 24% 30% 17% 5%	675
	21st to end	Day	14% 3 28% 28% 19% 7%	734
June	1st to 10th	Day	6% 3 18% 36% 26% 11%	680
	11th to 20th	Day	9% 2 20% 36% 27% 5%	680
	21st to end	Day	8% 3 27% 34% 23% 5%	680
July	1st to 10th	Day	11% 2 13% 30% 31% 13%	671
	11th to 20th	Day	7% 2 16% 37% 27% 10%	668
	21st to end	Day	10% 1 13% 32% 34% 9%	739
August	1st to 10th	Day	8% 2 13% 38% 31% 9%	676
	11th to 20th	Day	10% 2 16% 30% 32% 10%	578
	21st to end	Day	9% 1 11% 32% 33% 14%	539
September	1st to 10th	Day	12% 3 13% 30% 29% 13%	490
	11th to 20th	Day	7% 2 13% 35% 27% 15%	490
	21st to end	Day	10% 5% 23% 28% 23% 10%	367
October	1st to 10th	Day	12% 4 24% 33% 17% 9%	300
	11th to 20th	Day	14% 17% 31% 25% 13% 1	300
	21st to end	Day	26% 12% 33% 21% 8%	330
November	1st to 10th	Day	11% 5% 37% 30% 12% 4	279
	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	15% 10% 35% 30% 9% 1	563
	21st to end	Night	22% 5% 34% 31% 7%	570
May	1st to 10th	Night	18% 6% 29% 35% 11% 1	570
	11th to 20th	Night	17% 3 24% 37% 17% 1	561
	21st to end	Night	12% 3 25% 35% 23% 3	617
June	1st to 10th	Night	9% 2 17% 42% 28% 2	570
	11th to 20th	Night	8% 2 19% 42% 26% 2	570
	21st to end	Night	5% 3 22% 46% 22% 2	570
July	1st to 10th	Night	10% 1 10% 34% 38% 6%	555
	11th to 20th	Night	9% 1 13% 41% 31% 5%	552
	21st to end	Night	8% 1 10% 41% 37% 4	624
August	1st to 10th	Night	8% 1 9% 41% 38% 3	567
	11th to 20th	Night	9% 2 11% 42% 32% 5%	564
	21st to end	Night	6% 1 10% 39% 41% 3	627
September	1st to 10th	Night	12% 2 15% 36% 30% 5%	570
	11th to 20th	Night	12% 2 17% 36% 28% 5%	570
	21st to end	Night	11% 5% 22% 34% 22% 5%	698
October	1st to 10th	Night	11% 4 25% 34% 22% 4	760
	11th to 20th	Night	15% 9% 33% 31% 12% 1	760
	21st to end	Night	21% 9% 35% 27% 8%	836
November	1st to 10th	Night	13% 8% 37% 32% 9%	755
	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 2024-11-01 21:47:46. Version ac07

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