Youngstown
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Youngstown clear sky chart from 2005-11-06 to 2026-10-14.

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	16% 10% 4 9% 5% 5% 5% 4 5% 7% 30%	149042
	Night	16% 12% 4 10% 5% 5% 4 3 5% 6% 30%	142678
Transparency	Day	52% 5% 11% 20% 11% 1	152661
	Night	54% 5% 10% 19% 11% 1	147130
Seeing	Day	22% 14% 28% 21% 11% 4	17145
	Night	22% 11% 26% 28% 11% 1	26816

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	16% 20% 7% 23% 6% 4 3 2 3 4 11%	5258
	11th to 20th	Day	11% 21% 8% 18% 10% 6% 5% 2 3 4 11%	5280
	21st to end	Day	18% 17% 7% 14% 9% 7% 4 3 4 4 13%	5780
February	1st to 10th	Day	18% 17% 6% 11% 8% 5% 4 3 3 5% 20%	1890
	11th to 20th	Day	16% 14% 7% 14% 8% 5% 4 3 4 5% 20%	1843
	21st to end	Day	18% 15% 4 12% 5% 5% 4 4 6% 5% 22%	1730
March	1st to 10th	Day	17% 11% 6% 12% 5% 4 4 3 4 6% 28%	5037
	11th to 20th	Day	12% 10% 4 10% 5% 5% 5% 3 5% 6% 35%	5090
	21st to end	Day	20% 11% 4 10% 5% 4 4 3 4 6% 28%	5586
April	1st to 10th	Day	16% 13% 4 8% 5% 4 5% 3 6% 7% 29%	2395
	11th to 20th	Day	18% 11% 3 8% 5% 4 5% 4 5% 6% 32%	2592
	21st to end	Day	20% 11% 3 6% 5% 3 4 3 4 6% 34%	2730
May	1st to 10th	Day	20% 9% 3 8% 5% 5% 6% 4 6% 6% 27%	7616
	11th to 20th	Day	17% 8% 3 8% 5% 5% 4 4 6% 8% 32%	7626
	21st to end	Day	19% 7% 3 7% 5% 4 4 4 6% 6% 36%	8803
June	1st to 10th	Day	14% 6% 2 7% 6% 5% 6% 4 7% 8% 35%	2940
	11th to 20th	Day	13% 7% 3 8% 6% 4 5% 4 5% 9% 36%	2940
	21st to end	Day	13% 5% 3 7% 4 5% 5% 5% 7% 9% 37%	2940
July	1st to 10th	Day	9% 7% 3 8% 5% 5% 5% 4 6% 9% 40%	7965
	11th to 20th	Day	9% 6% 2 6% 5% 5% 5% 4 8% 11% 38%	7680
	21st to end	Day	12% 7% 3 7% 5% 5% 5% 4 7% 9% 37%	8340
August	1st to 10th	Day	17% 8% 4 8% 5% 5% 6% 4 6% 8% 29%	6014
	11th to 20th	Day	16% 8% 3 7% 5% 5% 6% 4 7% 9% 30%	5951
	21st to end	Day	7% 5% 3 7% 5% 6% 7% 6% 8% 11% 37%	6368
September	1st to 10th	Day	13% 7% 2 6% 4 4 4 3 5% 7% 44%	2482
	11th to 20th	Day	11% 6% 3 6% 4 4 5% 4 5% 8% 44%	2310
	21st to end	Day	19% 9% 3 7% 4 4 5% 3 5% 6% 35%	2310
October	1st to 10th	Day	15% 6% 3 6% 4 4 4 4 6% 8% 41%	2126
	11th to 20th	Day	20% 8% 3 8% 5% 4 4 4 5% 6% 32%	2030
	21st to end	Day	23% 10% 3 8% 4 5% 4 4 5% 6% 28%	2200
November	1st to 10th	Day	12% 9% 3 8% 5% 4 5% 4 5% 6% 39%	1912
	11th to 20th	Day	18% 15% 4 8% 5% 4 4 5% 4 5% 27%	1775
	21st to end	Day	17% 18% 6% 9% 6% 4 4 3 5% 6% 21%	1680
December	1st to 10th	Day	21% 15% 8% 13% 5% 4 4 4 4 5% 17%	2680
	11th to 20th	Day	23% 20% 6% 11% 5% 3 3 3 4 5% 18%	3070
	21st to end	Day	24% 22% 7% 14% 6% 4 3 2 3 4 9%	4073
January	1st to 10th	Night	16% 19% 7% 22% 6% 5% 4 3 4 4 11%	7635
	11th to 20th	Night	12% 19% 9% 17% 9% 6% 5% 3 3 4 13%	7680
	21st to end	Night	19% 15% 6% 12% 7% 6% 5% 3 4 4 18%	8401
February	1st to 10th	Night	20% 15% 5% 11% 7% 5% 4 3 4 5% 22%	2730
	11th to 20th	Night	17% 14% 5% 13% 7% 5% 4 3 4 5% 21%	2658
	21st to end	Night	20% 14% 5% 12% 5% 5% 4 3 4 4 24%	2076
March	1st to 10th	Night	22% 13% 4 9% 4 4 4 2 3 5% 30%	5034
	11th to 20th	Night	15% 10% 4 8% 4 4 3 3 5% 6% 37%	5090
	21st to end	Night	18% 12% 3 8% 5% 5% 4 3 4 5% 33%	5588
April	1st to 10th	Night	19% 12% 3 7% 5% 4 5% 3 5% 6% 30%	2223
	11th to 20th	Night	16% 10% 3 7% 5% 5% 4 3 5% 7% 33%	1993
	21st to end	Night	16% 9% 3 6% 5% 5% 4 3 5% 8% 36%	1890
May	1st to 10th	Night	24% 9% 3 8% 4 4 4 4 5% 6% 28%	5237
	11th to 20th	Night	15% 10% 3 7% 4 4 4 3 5% 8% 37%	5234
	21st to end	Night	21% 7% 2 6% 4 4 4 3 5% 8% 37%	5346
June	1st to 10th	Night	10% 6% 3 7% 5% 6% 5% 4 6% 7% 43%	1680
	11th to 20th	Night	11% 6% 3 7% 5% 4 4 4 6% 8% 43%	1680
	21st to end	Night	11% 6% 2 7% 5% 5% 5% 4 7% 8% 40%	1680
July	1st to 10th	Night	10% 7% 3 8% 6% 5% 5% 4 5% 8% 39%	4975
	11th to 20th	Night	9% 6% 3 6% 5% 5% 5% 4 7% 10% 41%	5277
	21st to end	Night	10% 6% 2 7% 4 4 5% 3 5% 7% 45%	5736
August	1st to 10th	Night	14% 10% 4 9% 5% 5% 5% 3 5% 6% 34%	4135
	11th to 20th	Night	15% 10% 3 8% 4 4 3 4 5% 6% 38%	4095
	21st to end	Night	7% 6% 2 6% 5% 5% 6% 5% 6% 9% 42%	4710
September	1st to 10th	Night	12% 6% 2 4 4 4 4 4 6% 7% 48%	2134
	11th to 20th	Night	11% 5% 1 4 4 4 4 4 6% 8% 51%	2310
	21st to end	Night	18% 8% 3 6% 4 4 5% 3 5% 7% 37%	2310
October	1st to 10th	Night	14% 5% 2 6% 3 4 4 3 5% 7% 46%	2494
	11th to 20th	Night	17% 7% 3 8% 5% 4 5% 4 6% 7% 35%	2437
	21st to end	Night	24% 8% 2 6% 4 3 3 4 5% 6% 35%	2640
November	1st to 10th	Night	14% 8% 3 6% 4 4 5% 3 4 7% 42%	2603
	11th to 20th	Night	17% 15% 4 8% 5% 4 4 3 4 5% 29%	2841
	21st to end	Night	20% 17% 4 7% 5% 4 4 3 5% 6% 25%	2940
December	1st to 10th	Night	17% 18% 8% 13% 7% 5% 4 3 4 5% 17%	4720
	11th to 20th	Night	19% 20% 8% 11% 5% 4 4 3 3 5% 18%	5345
	21st to end	Night	23% 19% 6% 12% 6% 4 4 3 4 4 14%	7121

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	79% 3 8% 7% 3	5259
	11th to 20th	Day	78% 3 6% 8% 5%	5280
	21st to end	Day	76% 3 7% 11% 3	5780
February	1st to 10th	Day	68% 3 8% 14% 7%	1890
	11th to 20th	Day	67% 5% 9% 13% 6%	1852
	21st to end	Day	62% 5% 10% 15% 6% 1	1730
March	1st to 10th	Day	57% 5% 10% 21% 7%	5037
	11th to 20th	Day	50% 5% 15% 22% 7% 1	5090
	21st to end	Day	56% 5% 8% 19% 12% 1	5586
April	1st to 10th	Day	53% 6% 12% 16% 12% 1	2395
	11th to 20th	Day	51% 6% 11% 17% 12% 2	2592
	21st to end	Day	51% 6% 10% 21% 10% 2	2730
May	1st to 10th	Day	55% 5% 10% 19% 8% 3	7651
	11th to 20th	Day	49% 6% 10% 23% 11% 1	7630
	21st to end	Day	47% 6% 10% 18% 16% 3	8818
June	1st to 10th	Day	44% 7% 12% 23% 12% 1	2940
	11th to 20th	Day	45% 7% 13% 21% 13% 1	2940
	21st to end	Day	41% 7% 13% 24% 13% 1	2940
July	1st to 10th	Day	41% 4 12% 28% 14% 2	7900
	11th to 20th	Day	38% 4 12% 32% 13%	7611
	21st to end	Day	42% 4 11% 23% 19% 1	8156
August	1st to 10th	Day	52% 5% 11% 18% 10% 3	6001
	11th to 20th	Day	49% 5% 13% 26% 7% 1	5990
	21st to end	Day	38% 6% 17% 27% 11% 1	6368
September	1st to 10th	Day	39% 6% 12% 23% 17% 3	2482
	11th to 20th	Day	37% 7% 13% 25% 17% 1	2310
	21st to end	Day	48% 6% 11% 22% 12% 1	2310
October	1st to 10th	Day	33% 5% 12% 30% 20% 1	3399
	11th to 20th	Day	47% 4 11% 21% 14% 4	3270
	21st to end	Day	42% 3 13% 26% 15% 1	3538
November	1st to 10th	Day	44% 6% 12% 21% 15% 2	1912
	11th to 20th	Day	56% 6% 10% 17% 8% 2	1775
	21st to end	Day	63% 5% 11% 15% 6% 1	1680
December	1st to 10th	Day	70% 4 11% 12% 3	2680
	11th to 20th	Day	70% 4 9% 13% 4	3066
	21st to end	Day	79% 3 7% 8% 2	4073
January	1st to 10th	Night	77% 4 8% 9% 3	7636
	11th to 20th	Night	76% 3 8% 9% 4	7680
	21st to end	Night	70% 3 8% 13% 6% 1	8401
February	1st to 10th	Night	65% 5% 9% 16% 5%	2730
	11th to 20th	Night	64% 5% 9% 16% 5%	2660
	21st to end	Night	63% 5% 8% 15% 9% 1	2076
March	1st to 10th	Night	59% 3 11% 18% 8%	5034
	11th to 20th	Night	46% 5% 14% 24% 9% 2	5090
	21st to end	Night	53% 5% 9% 18% 14% 1	5588
April	1st to 10th	Night	54% 6% 10% 17% 12% 1	2223
	11th to 20th	Night	50% 6% 12% 17% 13% 2	1993
	21st to end	Night	45% 6% 12% 21% 14% 2	1890
May	1st to 10th	Night	56% 4 8% 17% 11% 3	5264
	11th to 20th	Night	46% 5% 10% 26% 12% 1	5235
	21st to end	Night	46% 5% 11% 22% 14% 2	5353
June	1st to 10th	Night	39% 7% 11% 23% 18% 2	1680
	11th to 20th	Night	38% 6% 14% 23% 16% 2	1680
	21st to end	Night	39% 8% 13% 23% 16% 1	1680
July	1st to 10th	Night	44% 4 10% 23% 18% 1	4933
	11th to 20th	Night	39% 4 14% 30% 12% 1	5226
	21st to end	Night	38% 4 11% 18% 27% 1	5606
August	1st to 10th	Night	52% 4 10% 19% 13% 2	4124
	11th to 20th	Night	47% 4 14% 23% 10% 1	4122
	21st to end	Night	36% 5% 15% 30% 12% 2	4710
September	1st to 10th	Night	33% 7% 12% 25% 19% 4	2134
	11th to 20th	Night	31% 6% 15% 26% 21% 2	2310
	21st to end	Night	46% 6% 11% 20% 16% 1	2310
October	1st to 10th	Night	34% 4 9% 28% 24% 1	4001
	11th to 20th	Night	40% 5% 12% 23% 14% 6%	3936
	21st to end	Night	38% 4 11% 30% 17% 2	4252
November	1st to 10th	Night	42% 5% 12% 24% 15% 3	2603
	11th to 20th	Night	56% 6% 9% 18% 8% 3	2841
	21st to end	Night	60% 5% 11% 17% 5% 1	2940
December	1st to 10th	Night	70% 4 11% 11% 3	4720
	11th to 20th	Night	69% 4 10% 14% 3	5348
	21st to end	Night	73% 5% 10% 11% 2	7121

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	32% 24% 30% 9% 3	330
	11th to 20th	Day	33% 28% 29% 8% 2	330
	21st to end	Day	29% 26% 31% 11% 2 1	363
February	1st to 10th	Day	29% 18% 41% 10% 2	330
	11th to 20th	Day	32% 25% 30% 10% 2	330
	21st to end	Day	29% 25% 37% 9%	273
March	1st to 10th	Day	29% 18% 34% 15% 3	532
	11th to 20th	Day	31% 19% 29% 15% 4 1	540
	21st to end	Day	34% 19% 28% 15% 4 1	594
April	1st to 10th	Day	28% 22% 28% 15% 6% 1	540
	11th to 20th	Day	29% 17% 26% 16% 8% 4	532
	21st to end	Day	26% 17% 31% 18% 6% 2	540
May	1st to 10th	Day	29% 19% 27% 15% 8% 2	543
	11th to 20th	Day	21% 14% 33% 21% 8% 3	567
	21st to end	Day	19% 10% 24% 26% 15% 5%	617
June	1st to 10th	Day	15% 10% 34% 25% 11% 4	570
	11th to 20th	Day	20% 11% 27% 25% 14% 3	570
	21st to end	Day	15% 9% 33% 25% 15% 3	570
July	1st to 10th	Day	12% 6% 18% 30% 24% 9%	565
	11th to 20th	Day	13% 6% 26% 28% 20% 8%	564
	21st to end	Day	14% 5% 25% 28% 19% 9%	620
August	1st to 10th	Day	13% 6% 22% 31% 19% 10%	566
	11th to 20th	Day	18% 5% 22% 27% 18% 11%	559
	21st to end	Day	10% 5% 22% 31% 20% 11%	627
September	1st to 10th	Day	13% 8% 23% 25% 21% 10%	570
	11th to 20th	Day	10% 5% 20% 30% 25% 11%	570
	21st to end	Day	24% 9% 26% 21% 14% 6%	570
October	1st to 10th	Day	15% 9% 26% 26% 19% 5%	570
	11th to 20th	Day	22% 15% 34% 19% 8% 2	542
	21st to end	Day	28% 16% 31% 19% 6%	583
November	1st to 10th	Day	19% 22% 33% 15% 9% 1	390
	11th to 20th	Day	33% 17% 29% 14% 6% 1	269
	21st to end	Day	33% 16% 39% 12%	220
December	1st to 10th	Day	34% 22% 30% 11% 3 1	220
	11th to 20th	Day	34% 18% 34% 10% 4	220
	21st to end	Day	39% 16% 31% 13% 1	249
January	1st to 10th	Night	28% 19% 33% 17% 3	840
	11th to 20th	Night	30% 19% 30% 17% 3	840
	21st to end	Night	28% 19% 30% 20% 3	924
February	1st to 10th	Night	29% 16% 29% 24% 3	840
	11th to 20th	Night	28% 17% 35% 19% 2	823
	21st to end	Night	29% 14% 34% 20% 3	692
March	1st to 10th	Night	27% 15% 32% 24% 3	840
	11th to 20th	Night	26% 15% 29% 24% 5% 1	840
	21st to end	Night	25% 14% 34% 23% 5% 1	924
April	1st to 10th	Night	27% 14% 30% 24% 6%	840
	11th to 20th	Night	23% 13% 32% 23% 8% 1	749
	21st to end	Night	20% 9% 34% 31% 5%	630
May	1st to 10th	Night	24% 9% 25% 31% 10% 1	630
	11th to 20th	Night	20% 7% 24% 36% 12% 1	621
	21st to end	Night	14% 4 25% 36% 19% 2	538
June	1st to 10th	Night	11% 5% 25% 42% 16%	420
	11th to 20th	Night	13% 6% 24% 44% 13%	420
	21st to end	Night	11% 4 25% 39% 20%	420
July	1st to 10th	Night	8% 4 14% 44% 25% 5%	508
	11th to 20th	Night	10% 3 18% 38% 28% 3	612
	21st to end	Night	12% 2 13% 42% 29% 2	690
August	1st to 10th	Night	12% 3 14% 43% 26% 2	627
	11th to 20th	Night	16% 3 11% 36% 29% 4	624
	21st to end	Night	12% 2 19% 34% 28% 4	767
September	1st to 10th	Night	15% 4 18% 34% 25% 4	840
	11th to 20th	Night	13% 3 14% 36% 29% 5%	840
	21st to end	Night	20% 7% 22% 27% 19% 4	840
October	1st to 10th	Night	16% 8% 24% 29% 20% 3	840
	11th to 20th	Night	21% 11% 31% 27% 9% 1	813
	21st to end	Night	28% 10% 29% 27% 6%	880
November	1st to 10th	Night	20% 10% 31% 28% 11% 1	820
	11th to 20th	Night	28% 15% 28% 21% 6% 1	840
	21st to end	Night	31% 14% 29% 21% 5%	840
December	1st to 10th	Night	31% 18% 28% 18% 5%	840
	11th to 20th	Night	29% 18% 29% 20% 4	840
	21st to end	Night	31% 16% 31% 21% 2	924

Page generated at 2026-10-11 05:06:28. Version ac07

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