Wooster
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Wooster clear sky chart from 2005-11-06 to 2024-08-15.

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	15% 11% 4 8% 5% 5% 5% 4 6% 7% 31%	94931
	Night	15% 12% 4 8% 5% 4 4 3 5% 6% 33%	93699
Transparency	Day	51% 6% 11% 19% 11% 1	94703
	Night	51% 6% 11% 20% 11% 2	93531
Seeing	Day	20% 12% 27% 21% 14% 6%	14340
	Night	20% 9% 27% 30% 13% 2	24401

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	19% 21% 6% 13% 5% 4 3 3 5% 6% 16%	2836
	11th to 20th	Day	14% 22% 7% 12% 5% 5% 4 4 5% 5% 16%	2840
	21st to end	Day	26% 20% 10% 12% 6% 4 3 3 3 3 10%	3124
February	1st to 10th	Day	18% 17% 6% 10% 7% 4 4 3 4 5% 22%	1710
	11th to 20th	Day	15% 13% 4 14% 7% 5% 5% 3 4 5% 23%	1750
	21st to end	Day	17% 15% 4 10% 5% 4 4 3 5% 5% 27%	1570
March	1st to 10th	Day	22% 15% 5% 8% 5% 4 4 3 4 6% 25%	3334
	11th to 20th	Day	12% 12% 4 11% 5% 5% 4 3 4 5% 34%	3480
	21st to end	Day	21% 9% 4 9% 5% 4 3 4 5% 6% 30%	3815
April	1st to 10th	Day	12% 13% 4 9% 5% 5% 4 5% 5% 7% 31%	2104
	11th to 20th	Day	17% 10% 3 8% 5% 5% 4 3 4 6% 34%	2429
	21st to end	Day	18% 10% 3 8% 5% 4 4 4 5% 6% 32%	2470
May	1st to 10th	Day	20% 10% 3 8% 6% 5% 5% 4 5% 6% 29%	4082
	11th to 20th	Day	19% 8% 3 7% 5% 4 4 3 6% 8% 33%	4081
	21st to end	Day	11% 6% 2 7% 5% 5% 6% 5% 6% 9% 38%	4476
June	1st to 10th	Day	11% 7% 3 7% 5% 5% 5% 4 7% 9% 36%	2532
	11th to 20th	Day	13% 6% 3 7% 5% 4 5% 4 8% 9% 36%	2660
	21st to end	Day	11% 6% 2 6% 5% 5% 5% 5% 8% 9% 38%	2475
July	1st to 10th	Day	10% 6% 3 8% 5% 5% 5% 5% 7% 10% 37%	4120
	11th to 20th	Day	9% 5% 2 6% 4 5% 5% 5% 8% 10% 41%	4120
	21st to end	Day	10% 6% 3 7% 5% 5% 6% 5% 7% 9% 37%	4466
August	1st to 10th	Day	8% 7% 2 8% 6% 6% 6% 5% 8% 9% 36%	2457
	11th to 20th	Day	10% 6% 2 6% 5% 6% 7% 4 8% 9% 36%	2357
	21st to end	Day	9% 6% 2 6% 5% 7% 6% 5% 7% 8% 39%	2547
September	1st to 10th	Day	14% 6% 2 5% 5% 4 4 4 6% 7% 43%	2030
	11th to 20th	Day	10% 7% 2 5% 6% 4 5% 4 7% 9% 42%	1980
	21st to end	Day	17% 8% 3 5% 4 4 4 3 4 7% 39%	1980
October	1st to 10th	Day	14% 7% 3 6% 4 5% 4 4 6% 7% 39%	1881
	11th to 20th	Day	17% 9% 4 7% 4 4 4 4 5% 6% 36%	1800
	21st to end	Day	21% 11% 3 8% 5% 4 4 3 4 5% 31%	1965
November	1st to 10th	Day	10% 10% 3 8% 5% 5% 3 3 5% 6% 42%	1672
	11th to 20th	Day	16% 13% 4 8% 6% 4 4 3 5% 6% 31%	1710
	21st to end	Day	17% 15% 4 9% 5% 6% 4 4 5% 6% 25%	1579
December	1st to 10th	Day	18% 20% 6% 13% 6% 4 3 3 4 4 21%	1520
	11th to 20th	Day	18% 16% 6% 15% 5% 3 4 2 6% 7% 19%	1910
	21st to end	Day	22% 23% 7% 12% 5% 4 3 3 4 4 11%	3069
January	1st to 10th	Night	16% 21% 7% 13% 6% 5% 4 4 4 4 17%	4109
	11th to 20th	Night	13% 20% 9% 17% 6% 4 5% 4 4 4 13%	4120
	21st to end	Night	25% 19% 7% 14% 5% 3 3 2 3 3 15%	4532
February	1st to 10th	Night	20% 15% 5% 11% 6% 5% 4 3 4 5% 23%	2470
	11th to 20th	Night	16% 15% 5% 9% 6% 5% 4 3 6% 6% 24%	2314
	21st to end	Night	18% 14% 5% 12% 7% 4 4 3 5% 5% 24%	1884
March	1st to 10th	Night	22% 14% 4 7% 4 4 3 2 4 5% 33%	3519
	11th to 20th	Night	15% 10% 3 6% 5% 4 5% 4 6% 7% 37%	3480
	21st to end	Night	17% 11% 3 7% 5% 4 4 3 4 6% 36%	3817
April	1st to 10th	Night	15% 13% 3 7% 5% 5% 4 3 5% 6% 34%	2076
	11th to 20th	Night	16% 9% 4 8% 5% 4 4 4 6% 7% 35%	1716
	21st to end	Night	15% 9% 3 6% 5% 5% 5% 4 5% 7% 37%	1710
May	1st to 10th	Night	23% 11% 3 7% 5% 5% 3 4 5% 6% 27%	2813
	11th to 20th	Night	18% 8% 3 6% 4 3 4 3 5% 7% 39%	2812
	21st to end	Night	9% 6% 2 5% 4 4 5% 4 6% 11% 44%	3079
June	1st to 10th	Night	9% 7% 2 7% 5% 5% 4 3 6% 7% 44%	1639
	11th to 20th	Night	8% 6% 2 6% 4 4 5% 5% 7% 10% 41%	1520
	21st to end	Night	9% 6% 2 5% 5% 4 5% 4 7% 9% 43%	1692
July	1st to 10th	Night	10% 6% 2 7% 4 3 4 3 6% 8% 47%	2840
	11th to 20th	Night	9% 4 1 6% 4 4 5% 4 7% 9% 48%	2840
	21st to end	Night	6% 6% 3 7% 6% 4 5% 4 6% 9% 44%	3087
August	1st to 10th	Night	6% 5% 2 6% 4 4 5% 4 8% 11% 44%	1701
	11th to 20th	Night	7% 6% 2 7% 4 4 4 4 7% 9% 46%	1643
	21st to end	Night	8% 5% 2 5% 4 4 5% 5% 5% 9% 49%	1790
September	1st to 10th	Night	12% 5% 2 6% 4 3 4 3 5% 7% 49%	1927
	11th to 20th	Night	10% 4 2 4 3 3 4 4 6% 8% 53%	1980
	21st to end	Night	14% 7% 2 6% 4 3 4 3 5% 6% 44%	1980
October	1st to 10th	Night	13% 6% 2 6% 4 4 4 4 6% 7% 44%	2078
	11th to 20th	Night	16% 9% 2 7% 5% 4 5% 3 5% 6% 37%	2160
	21st to end	Night	22% 9% 3 6% 4 4 4 3 5% 6% 33%	2389
November	1st to 10th	Night	14% 9% 2 5% 4 4 5% 4 6% 7% 42%	2406
	11th to 20th	Night	16% 13% 4 7% 5% 4 3 3 6% 6% 32%	2470
	21st to end	Night	19% 14% 4 8% 5% 4 4 4 5% 6% 28%	2596
December	1st to 10th	Night	20% 17% 5% 10% 5% 4 4 3 4 5% 22%	2660
	11th to 20th	Night	17% 15% 6% 11% 5% 4 4 3 5% 6% 24%	3285
	21st to end	Night	21% 22% 8% 10% 5% 5% 4 2 4 5% 14%	4565

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	70% 4 9% 13% 3	2837
	11th to 20th	Day	70% 3 10% 11% 5%	2840
	21st to end	Day	81% 4 6% 7% 2	3124
February	1st to 10th	Day	65% 5% 8% 15% 7% 1	1710
	11th to 20th	Day	63% 6% 7% 16% 8% 1	1759
	21st to end	Day	59% 3 13% 15% 8% 2	1570
March	1st to 10th	Day	61% 4 9% 21% 5%	3334
	11th to 20th	Day	52% 6% 9% 25% 8% 1	3480
	21st to end	Day	55% 5% 10% 18% 11% 1	3815
April	1st to 10th	Day	52% 6% 13% 17% 12% 1	2104
	11th to 20th	Day	51% 5% 11% 17% 14% 2	2429
	21st to end	Day	52% 6% 10% 20% 10% 2	2470
May	1st to 10th	Day	55% 6% 10% 21% 8% 1	4120
	11th to 20th	Day	49% 6% 12% 22% 9% 1	4085
	21st to end	Day	39% 9% 13% 21% 13% 5%	4489
June	1st to 10th	Day	42% 8% 11% 25% 13% 1	2532
	11th to 20th	Day	43% 7% 13% 22% 13% 1	2660
	21st to end	Day	39% 8% 13% 23% 15% 2	2475
July	1st to 10th	Day	42% 6% 12% 23% 16% 2	4055
	11th to 20th	Day	35% 7% 13% 25% 19% 1	4051
	21st to end	Day	41% 7% 14% 17% 18% 3	4324
August	1st to 10th	Day	41% 9% 13% 24% 12%	2444
	11th to 20th	Day	40% 9% 14% 24% 11% 1	2357
	21st to end	Day	38% 10% 12% 22% 15% 4	2547
September	1st to 10th	Day	39% 6% 13% 21% 17% 3	2030
	11th to 20th	Day	37% 7% 13% 26% 15% 2	1980
	21st to end	Day	45% 6% 10% 22% 17% 1	1980
October	1st to 10th	Day	42% 7% 10% 23% 17% 1	1881
	11th to 20th	Day	47% 5% 13% 22% 13% 1	1800
	21st to end	Day	55% 5% 12% 17% 9% 1	1965
November	1st to 10th	Day	42% 5% 11% 24% 15% 2	1672
	11th to 20th	Day	54% 5% 9% 20% 10% 2	1710
	21st to end	Day	60% 6% 9% 17% 7% 1	1579
December	1st to 10th	Day	68% 4 10% 13% 4	1520
	11th to 20th	Day	65% 4 10% 17% 4	1906
	21st to end	Day	78% 4 9% 7% 3	3069
January	1st to 10th	Night	70% 5% 8% 14% 4	4109
	11th to 20th	Night	75% 4 9% 10% 2	4120
	21st to end	Night	76% 3 6% 11% 3	4532
February	1st to 10th	Night	63% 5% 11% 15% 6%	2470
	11th to 20th	Night	59% 5% 11% 16% 8% 1	2316
	21st to end	Night	63% 5% 9% 13% 9% 2	1884
March	1st to 10th	Night	55% 4 10% 20% 10%	3519
	11th to 20th	Night	44% 8% 12% 26% 8% 2	3480
	21st to end	Night	49% 5% 9% 26% 10% 1	3817
April	1st to 10th	Night	50% 6% 11% 18% 14% 2	2076
	11th to 20th	Night	47% 6% 11% 17% 15% 3	1716
	21st to end	Night	46% 5% 11% 20% 15% 2	1710
May	1st to 10th	Night	56% 6% 9% 19% 8% 1	2840
	11th to 20th	Night	44% 7% 11% 24% 13% 2	2813
	21st to end	Night	33% 8% 14% 27% 15% 4	3087
June	1st to 10th	Night	39% 6% 10% 24% 18% 3	1639
	11th to 20th	Night	35% 9% 14% 23% 18% 2	1520
	21st to end	Night	35% 8% 13% 25% 17% 2	1692
July	1st to 10th	Night	36% 5% 12% 24% 18% 5%	2795
	11th to 20th	Night	31% 6% 13% 32% 17% 1	2786
	21st to end	Night	36% 6% 13% 20% 22% 2	2988
August	1st to 10th	Night	32% 8% 15% 27% 18% 1	1690
	11th to 20th	Night	32% 8% 16% 26% 15% 2	1643
	21st to end	Night	31% 7% 14% 26% 18% 3	1790
September	1st to 10th	Night	34% 7% 12% 26% 17% 5%	1927
	11th to 20th	Night	28% 7% 12% 26% 25% 2	1980
	21st to end	Night	40% 5% 10% 23% 20% 2	1980
October	1st to 10th	Night	37% 7% 12% 23% 20% 1	2078
	11th to 20th	Night	46% 6% 9% 24% 13% 1	2160
	21st to end	Night	52% 5% 10% 21% 10% 2	2389
November	1st to 10th	Night	41% 5% 13% 23% 16% 3	2406
	11th to 20th	Night	52% 3 11% 20% 12% 2	2470
	21st to end	Night	58% 4 12% 19% 6% 1	2596
December	1st to 10th	Night	65% 4 10% 14% 6%	2660
	11th to 20th	Night	60% 5% 13% 19% 3	3288
	21st to end	Night	74% 4 10% 10% 2	4565

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	27% 21% 34% 11% 5% 1	270
	11th to 20th	Day	29% 23% 36% 9% 3 1	270
	21st to end	Day	28% 22% 34% 13% 2	297
February	1st to 10th	Day	28% 20% 36% 13% 3	270
	11th to 20th	Day	29% 28% 33% 9% 2	270
	21st to end	Day	29% 29% 31% 11%	225
March	1st to 10th	Day	27% 18% 30% 21% 4	393
	11th to 20th	Day	26% 13% 36% 17% 6% 1	460
	21st to end	Day	32% 15% 27% 22% 4	506
April	1st to 10th	Day	22% 17% 33% 18% 8% 2	460
	11th to 20th	Day	24% 18% 26% 18% 9% 5%	452
	21st to end	Day	23% 14% 32% 19% 10% 2	460
May	1st to 10th	Day	25% 15% 27% 20% 9% 3	463
	11th to 20th	Day	20% 10% 31% 20% 14% 6%	487
	21st to end	Day	13% 6% 24% 27% 22% 8%	529
June	1st to 10th	Day	13% 7% 28% 30% 16% 5%	490
	11th to 20th	Day	16% 9% 20% 29% 21% 5%	490
	21st to end	Day	12% 6% 29% 27% 20% 6%	490
July	1st to 10th	Day	13% 3 19% 26% 24% 16%	485
	11th to 20th	Day	12% 4 22% 26% 24% 12%	484
	21st to end	Day	11% 4 19% 25% 28% 12%	532
August	1st to 10th	Day	12% 4 16% 29% 25% 14%	486
	11th to 20th	Day	13% 5% 20% 28% 22% 12%	456
	21st to end	Day	10% 6% 15% 28% 24% 18%	495
September	1st to 10th	Day	13% 5% 21% 25% 23% 14%	450
	11th to 20th	Day	11% 4 16% 23% 30% 16%	450
	21st to end	Day	22% 8% 20% 22% 18% 10%	450
October	1st to 10th	Day	13% 8% 26% 25% 21% 7%	450
	11th to 20th	Day	19% 14% 33% 24% 8% 2	450
	21st to end	Day	29% 14% 31% 20% 6%	480
November	1st to 10th	Day	15% 17% 38% 17% 11% 2	270
	11th to 20th	Day	29% 14% 34% 15% 7% 1	270
	21st to end	Day	25% 16% 43% 14% 1	207
December	1st to 10th	Day	26% 19% 36% 13% 4 2	180
	11th to 20th	Day	23% 23% 37% 14% 2	180
	21st to end	Day	29% 22% 34% 12% 2	283
January	1st to 10th	Night	25% 16% 34% 20% 5%	760
	11th to 20th	Night	29% 15% 34% 17% 4	760
	21st to end	Night	27% 16% 31% 23% 3	836
February	1st to 10th	Night	27% 13% 34% 23% 3	760
	11th to 20th	Night	25% 15% 35% 23% 2	743
	21st to end	Night	27% 13% 37% 20% 3	628
March	1st to 10th	Night	23% 13% 33% 25% 5%	760
	11th to 20th	Night	20% 14% 34% 26% 6% 1	760
	21st to end	Night	25% 10% 31% 26% 6% 1	836
April	1st to 10th	Night	21% 12% 36% 26% 4 1	760
	11th to 20th	Night	19% 12% 31% 26% 10% 1	592
	21st to end	Night	18% 8% 32% 34% 6% 1	570
May	1st to 10th	Night	21% 7% 28% 34% 10% 1	570
	11th to 20th	Night	20% 6% 24% 37% 12% 2	561
	21st to end	Night	11% 2 17% 42% 25% 3	617
June	1st to 10th	Night	10% 5% 21% 44% 20%	499
	11th to 20th	Night	12% 3 20% 47% 17% 1	380
	21st to end	Night	11% 2 22% 42% 22% 1	552
July	1st to 10th	Night	10% 2 12% 41% 28% 6%	555
	11th to 20th	Night	7% 3 16% 41% 29% 4	552
	21st to end	Night	8% 3 12% 45% 30% 2	624
August	1st to 10th	Night	8% 2 11% 44% 31% 3	567
	11th to 20th	Night	9% 3 11% 43% 29% 5%	549
	21st to end	Night	9% 2 15% 34% 35% 6%	602
September	1st to 10th	Night	12% 4 18% 32% 29% 5%	720
	11th to 20th	Night	13% 2 12% 34% 35% 5%	720
	21st to end	Night	16% 5% 23% 31% 21% 4	720
October	1st to 10th	Night	15% 7% 19% 37% 18% 3	720
	11th to 20th	Night	20% 9% 30% 27% 12% 1	720
	21st to end	Night	26% 11% 27% 28% 7%	792
November	1st to 10th	Night	19% 8% 29% 30% 12% 1	740
	11th to 20th	Night	23% 13% 32% 23% 8% 1	760
	21st to end	Night	27% 10% 33% 24% 6% 1	760
December	1st to 10th	Night	31% 13% 30% 22% 4	760
	11th to 20th	Night	25% 12% 35% 23% 4	760
	21st to end	Night	27% 14% 33% 23% 3	836

Page generated at 2024-08-12 09:52:50. Version ac07

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