Reedsburg
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Reedsburg clear sky chart from 2005-11-06 to 2024-02-15.

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	13% 9% 4 7% 6% 3 5% 5% 5% 7% 36%	78253
	Night	13% 9% 4 7% 6% 3 4 5% 5% 6% 37%	80885
Transparency	Day	47% 6% 12% 22% 11% 1	77953
	Night	47% 6% 11% 22% 13% 1	80705
Seeing	Day	17% 12% 30% 24% 13% 4	14851
	Night	18% 10% 31% 29% 11% 1	24916

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	10% 13% 9% 14% 8% 4 4 4 4 4 26%	2527
	11th to 20th	Day	10% 12% 5% 11% 8% 4 5% 11% 7% 7% 20%	2530
	21st to end	Day	15% 16% 9% 13% 6% 3 4 3 4 5% 22%	2945
February	1st to 10th	Day	10% 11% 7% 9% 6% 3 5% 5% 5% 8% 32%	1710
	11th to 20th	Day	13% 10% 4 7% 6% 3 6% 4 5% 6% 35%	1686
	21st to end	Day	13% 11% 4 9% 8% 5% 4 5% 5% 6% 30%	1480
March	1st to 10th	Day	14% 8% 6% 7% 6% 5% 4 4 5% 6% 34%	1800
	11th to 20th	Day	13% 9% 3 7% 7% 3 4 4 5% 6% 39%	1944
	21st to end	Day	19% 11% 3 6% 6% 3 4 5% 5% 7% 30%	2322
April	1st to 10th	Day	18% 11% 4 7% 6% 3 5% 5% 5% 6% 31%	2160
	11th to 20th	Day	18% 9% 4 7% 5% 3 5% 5% 4 6% 33%	2134
	21st to end	Day	19% 10% 4 6% 6% 3 5% 5% 5% 6% 31%	2200
May	1st to 10th	Day	15% 8% 3 7% 6% 4 6% 6% 6% 8% 30%	2472
	11th to 20th	Day	17% 7% 3 6% 6% 4 4 5% 5% 7% 35%	2479
	21st to end	Day	15% 6% 2 5% 6% 4 6% 5% 6% 7% 37%	2725
June	1st to 10th	Day	11% 5% 2 6% 5% 3 5% 6% 5% 10% 43%	2520
	11th to 20th	Day	11% 5% 3 6% 6% 4 5% 5% 6% 9% 41%	2520
	21st to end	Day	12% 5% 3 5% 6% 3 6% 6% 6% 9% 39%	2520
July	1st to 10th	Day	8% 3 2 5% 4 4 6% 6% 7% 10% 45%	2520
	11th to 20th	Day	7% 4 2 5% 6% 4 6% 6% 7% 8% 46%	2520
	21st to end	Day	8% 3 3 4 4 4 5% 6% 6% 10% 46%	2743
August	1st to 10th	Day	6% 5% 2 5% 6% 4 5% 7% 8% 10% 41%	2453
	11th to 20th	Day	12% 6% 3 6% 6% 3 5% 5% 6% 8% 41%	2217
	21st to end	Day	9% 6% 2 5% 6% 3 5% 6% 5% 8% 46%	2376
September	1st to 10th	Day	14% 6% 2 5% 5% 3 4 5% 5% 9% 42%	2160
	11th to 20th	Day	12% 5% 3 5% 4 2 4 4 6% 8% 47%	2127
	21st to end	Day	13% 7% 3 6% 5% 3 4 4 6% 7% 42%	1976
October	1st to 10th	Day	14% 6% 2 5% 5% 4 4 5% 4 7% 45%	1800
	11th to 20th	Day	19% 9% 3 5% 6% 3 5% 4 5% 7% 34%	1800
	21st to end	Day	17% 10% 3 7% 6% 3 3 4 4 6% 39%	1832
November	1st to 10th	Day	12% 8% 3 6% 5% 4 4 4 5% 8% 42%	1672
	11th to 20th	Day	15% 11% 5% 9% 7% 3 4 4 4 6% 32%	1642
	21st to end	Day	13% 10% 4 7% 6% 3 4 4 5% 6% 38%	1520
December	1st to 10th	Day	13% 12% 6% 9% 6% 4 6% 4 4 7% 30%	1520
	11th to 20th	Day	14% 12% 6% 9% 6% 3 5% 5% 5% 7% 29%	1918
	21st to end	Day	18% 20% 9% 12% 5% 3 4 4 3 4 18%	2783
January	1st to 10th	Night	10% 12% 8% 11% 7% 3 5% 4 4 4 31%	4428
	11th to 20th	Night	11% 12% 6% 14% 9% 4 5% 6% 6% 6% 22%	4440
	21st to end	Night	15% 17% 9% 11% 6% 3 4 3 4 5% 23%	4720
February	1st to 10th	Night	9% 13% 5% 10% 6% 4 5% 5% 5% 6% 33%	2470
	11th to 20th	Night	10% 9% 4 8% 6% 4 4 5% 5% 5% 40%	2256
	21st to end	Night	15% 12% 4 7% 6% 3 4 4 4 5% 35%	1776
March	1st to 10th	Night	16% 10% 4 6% 5% 3 5% 4 4 6% 37%	2160
	11th to 20th	Night	14% 7% 2 6% 5% 4 5% 6% 6% 7% 38%	2032
	21st to end	Night	18% 10% 3 8% 6% 2 5% 4 4 6% 34%	2034
April	1st to 10th	Night	19% 9% 3 7% 6% 3 3 4 4 6% 36%	1800
	11th to 20th	Night	21% 7% 3 7% 4 3 3 4 6% 7% 37%	1775
	21st to end	Night	16% 9% 3 6% 5% 2 5% 6% 6% 8% 36%	1758
May	1st to 10th	Night	19% 8% 4 4 5% 3 5% 5% 6% 8% 34%	1486
	11th to 20th	Night	16% 7% 3 6% 5% 3 4 4 6% 7% 39%	1416
	21st to end	Night	12% 5% 3 4 6% 3 5% 5% 5% 8% 43%	1551
June	1st to 10th	Night	9% 4 2 5% 6% 3 6% 5% 6% 8% 46%	1440
	11th to 20th	Night	11% 6% 3 4 5% 2 3 4 6% 9% 47%	1440
	21st to end	Night	9% 4 2 5% 4 2 4 4 6% 9% 51%	1440
July	1st to 10th	Night	7% 4 2 3 3 2 3 5% 6% 8% 56%	1440
	11th to 20th	Night	7% 3 2 5% 5% 2 5% 4 4 10% 53%	1440
	21st to end	Night	6% 2 2 4 4 2 5% 6% 6% 10% 53%	1575
August	1st to 10th	Night	6% 4 3 5% 5% 4 5% 6% 6% 9% 49%	1484
	11th to 20th	Night	8% 6% 2 5% 4 3 4 4 5% 7% 51%	1682
	21st to end	Night	9% 4 2 4 4 2 5% 5% 4 7% 54%	1980
September	1st to 10th	Night	11% 4 2 5% 5% 3 3 4 5% 7% 52%	1800
	11th to 20th	Night	14% 4 2 4 4 2 4 3 4 7% 53%	1813
	21st to end	Night	11% 6% 2 4 4 3 4 5% 5% 6% 50%	1980
October	1st to 10th	Night	12% 7% 3 5% 4 3 4 4 4 5% 50%	2160
	11th to 20th	Night	16% 7% 3 5% 5% 3 4 4 5% 8% 40%	2160
	21st to end	Night	17% 10% 3 6% 4 3 4 5% 5% 7% 36%	2524
November	1st to 10th	Night	13% 8% 4 6% 4 2 4 5% 4 5% 45%	2406
	11th to 20th	Night	14% 9% 4 9% 7% 3 4 4 5% 6% 34%	2536
	21st to end	Night	16% 9% 4 6% 5% 3 3 4 4 6% 38%	2660
December	1st to 10th	Night	13% 12% 5% 8% 6% 3 5% 5% 6% 7% 30%	2660
	11th to 20th	Night	13% 13% 6% 10% 6% 5% 5% 5% 4 5% 28%	3279
	21st to end	Night	20% 16% 6% 11% 7% 3 4 4 4 5% 20%	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	63% 4 13% 14% 6%	2528
	11th to 20th	Day	60% 5% 12% 17% 6%	2530
	21st to end	Day	66% 4 10% 15% 5%	2945
February	1st to 10th	Day	52% 5% 13% 18% 11% 1	1710
	11th to 20th	Day	51% 4 13% 21% 9% 2	1695
	21st to end	Day	56% 5% 10% 17% 10% 2	1480
March	1st to 10th	Day	51% 5% 12% 22% 8% 2	1800
	11th to 20th	Day	46% 5% 13% 22% 13% 1	1944
	21st to end	Day	54% 6% 10% 21% 8% 1	2322
April	1st to 10th	Day	54% 6% 10% 18% 11% 1	2160
	11th to 20th	Day	52% 5% 8% 21% 12% 2	2134
	21st to end	Day	52% 7% 10% 18% 12% 1	2200
May	1st to 10th	Day	49% 8% 14% 20% 8% 1	2472
	11th to 20th	Day	48% 7% 12% 21% 12% 1	2483
	21st to end	Day	44% 8% 11% 21% 14% 2	2725
June	1st to 10th	Day	36% 7% 14% 28% 14% 2	2520
	11th to 20th	Day	39% 7% 12% 24% 17% 1	2520
	21st to end	Day	40% 8% 14% 23% 14% 1	2520
July	1st to 10th	Day	31% 9% 15% 30% 13% 2	2451
	11th to 20th	Day	33% 8% 14% 26% 17% 2	2445
	21st to end	Day	32% 8% 15% 27% 15% 3	2591
August	1st to 10th	Day	35% 9% 16% 27% 11% 2	2438
	11th to 20th	Day	39% 8% 12% 27% 13% 1	2217
	21st to end	Day	36% 7% 13% 25% 18% 2	2376
September	1st to 10th	Day	39% 7% 12% 24% 16% 1	2160
	11th to 20th	Day	36% 6% 13% 30% 14% 1	2127
	21st to end	Day	40% 5% 11% 29% 13% 1	1976
October	1st to 10th	Day	41% 6% 9% 31% 13% 1	1800
	11th to 20th	Day	50% 5% 11% 22% 11% 1	1800
	21st to end	Day	48% 5% 12% 22% 13% 1	1832
November	1st to 10th	Day	42% 4 14% 23% 15% 2	1672
	11th to 20th	Day	53% 5% 12% 19% 10% 1	1642
	21st to end	Day	48% 5% 16% 22% 8% 1	1520
December	1st to 10th	Day	55% 6% 13% 16% 8% 1	1520
	11th to 20th	Day	54% 5% 16% 14% 8% 2	1915
	21st to end	Day	71% 4 9% 10% 5%	2783
January	1st to 10th	Night	56% 6% 10% 20% 8%	4428
	11th to 20th	Night	62% 5% 10% 14% 9%	4440
	21st to end	Night	65% 5% 8% 16% 5%	4720
February	1st to 10th	Night	52% 4 11% 19% 11% 2	2470
	11th to 20th	Night	46% 5% 12% 23% 13% 2	2257
	21st to end	Night	52% 5% 9% 20% 11% 2	1776
March	1st to 10th	Night	49% 6% 12% 21% 9% 3	2160
	11th to 20th	Night	43% 6% 12% 22% 15% 2	2032
	21st to end	Night	52% 6% 8% 22% 11% 2	2034
April	1st to 10th	Night	50% 5% 10% 20% 14% 2	1800
	11th to 20th	Night	47% 4 8% 20% 17% 3	1775
	21st to end	Night	45% 7% 12% 20% 14% 2	1758
May	1st to 10th	Night	47% 8% 13% 18% 14%	1486
	11th to 20th	Night	44% 6% 12% 22% 14% 1	1417
	21st to end	Night	38% 7% 12% 26% 15% 2	1552
June	1st to 10th	Night	34% 8% 12% 28% 17% 1	1440
	11th to 20th	Night	35% 6% 11% 27% 20% 2	1440
	21st to end	Night	30% 8% 15% 26% 16% 4	1440
July	1st to 10th	Night	25% 8% 12% 34% 18% 3	1400
	11th to 20th	Night	28% 8% 13% 28% 20% 3	1392
	21st to end	Night	25% 8% 16% 30% 17% 5%	1487
August	1st to 10th	Night	31% 7% 14% 28% 17% 3	1475
	11th to 20th	Night	32% 6% 14% 29% 17% 2	1682
	21st to end	Night	29% 8% 12% 27% 20% 4	1980
September	1st to 10th	Night	32% 7% 10% 28% 22% 1	1800
	11th to 20th	Night	33% 5% 10% 34% 15% 2	1813
	21st to end	Night	34% 5% 10% 30% 19% 1	1980
October	1st to 10th	Night	38% 5% 8% 29% 19% 1	2160
	11th to 20th	Night	43% 7% 12% 22% 16% 1	2160
	21st to end	Night	47% 6% 11% 22% 13% 1	2524
November	1st to 10th	Night	41% 5% 11% 24% 17% 2	2406
	11th to 20th	Night	51% 5% 13% 19% 11% 1	2536
	21st to end	Night	48% 4 14% 24% 9% 1	2660
December	1st to 10th	Night	54% 6% 12% 20% 8% 1	2660
	11th to 20th	Night	58% 5% 11% 17% 8% 1	3281
	21st to end	Night	67% 5% 8% 14% 5%	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	16% 15% 35% 23% 8% 3	270
	11th to 20th	Day	22% 16% 36% 18% 7% 1	270
	21st to end	Day	20% 15% 35% 24% 4 1	297
February	1st to 10th	Day	15% 20% 41% 19% 4 1	270
	11th to 20th	Day	22% 25% 31% 18% 5%	252
	21st to end	Day	21% 23% 43% 12% 2	198
March	1st to 10th	Day	19% 18% 40% 17% 6%	240
	11th to 20th	Day	22% 20% 33% 17% 5% 4	240
	21st to end	Day	30% 14% 27% 20% 7% 2	408
April	1st to 10th	Day	28% 15% 34% 18% 4	420
	11th to 20th	Day	26% 20% 25% 16% 11% 2	412
	21st to end	Day	23% 14% 30% 21% 11% 1	420
May	1st to 10th	Day	20% 15% 36% 20% 8% 1	555
	11th to 20th	Day	21% 13% 32% 22% 8% 3	625
	21st to end	Day	18% 11% 27% 25% 14% 5%	679
June	1st to 10th	Day	10% 9% 30% 33% 15% 4	630
	11th to 20th	Day	12% 10% 34% 26% 15% 4	630
	21st to end	Day	14% 10% 28% 29% 16% 4	630
July	1st to 10th	Day	8% 4 21% 33% 23% 11%	621
	11th to 20th	Day	10% 6% 29% 30% 19% 6%	618
	21st to end	Day	8% 5% 30% 32% 20% 6%	684
August	1st to 10th	Day	8% 3 23% 33% 25% 8%	626
	11th to 20th	Day	14% 6% 18% 27% 23% 11%	531
	21st to end	Day	12% 8% 24% 30% 19% 8%	495
September	1st to 10th	Day	19% 6% 22% 28% 17% 7%	450
	11th to 20th	Day	14% 5% 22% 32% 19% 7%	450
	21st to end	Day	18% 11% 27% 23% 16% 4	446
October	1st to 10th	Day	19% 13% 30% 23% 13% 3	270
	11th to 20th	Day	24% 21% 29% 19% 6%	270
	21st to end	Day	25% 19% 35% 14% 5% 2	297
November	1st to 10th	Day	17% 15% 40% 19% 7% 1	270
	11th to 20th	Day	23% 17% 38% 17% 6%	270
	21st to end	Day	24% 15% 40% 15% 6%	270
December	1st to 10th	Day	16% 21% 43% 15% 5% 1	270
	11th to 20th	Day	21% 15% 36% 20% 7% 1	270
	21st to end	Day	29% 18% 37% 15% 1	297
January	1st to 10th	Night	15% 16% 37% 25% 7% 1	950
	11th to 20th	Night	20% 15% 34% 25% 5% 1	950
	21st to end	Night	21% 12% 37% 25% 5% 1	1045
February	1st to 10th	Night	15% 16% 38% 24% 6% 1	950
	11th to 20th	Night	17% 15% 38% 26% 5%	826
	21st to end	Night	22% 15% 37% 20% 5%	592
March	1st to 10th	Night	21% 14% 33% 24% 7% 1	720
	11th to 20th	Night	19% 11% 38% 24% 7% 1	592
	21st to end	Night	22% 10% 31% 27% 8% 2	594
April	1st to 10th	Night	21% 13% 36% 25% 5%	540
	11th to 20th	Night	26% 10% 29% 30% 6%	533
	21st to end	Night	21% 12% 31% 29% 7% 1	540
May	1st to 10th	Night	23% 9% 32% 29% 6% 1	540
	11th to 20th	Night	18% 9% 32% 31% 9% 1	531
	21st to end	Night	14% 6% 29% 35% 15% 1	584
June	1st to 10th	Night	10% 5% 31% 41% 11%	540
	11th to 20th	Night	14% 4 31% 37% 15%	540
	21st to end	Night	11% 5% 25% 39% 18% 1	540
July	1st to 10th	Night	8% 4 16% 40% 29% 4	525
	11th to 20th	Night	8% 3 25% 40% 22% 2	522
	21st to end	Night	6% 2 20% 47% 23% 2	591
August	1st to 10th	Night	7% 4 16% 44% 27% 3	537
	11th to 20th	Night	10% 3 17% 37% 27% 5%	534
	21st to end	Night	10% 2 21% 41% 23% 3	594
September	1st to 10th	Night	12% 5% 23% 37% 18% 6%	540
	11th to 20th	Night	15% 5% 22% 31% 22% 4	553
	21st to end	Night	14% 8% 28% 32% 16% 2	720
October	1st to 10th	Night	16% 8% 28% 30% 17% 1	720
	11th to 20th	Night	20% 11% 34% 28% 7%	720
	21st to end	Night	23% 12% 30% 27% 7% 1	792
November	1st to 10th	Night	17% 11% 38% 24% 10% 1	740
	11th to 20th	Night	20% 16% 38% 20% 6%	826
	21st to end	Night	22% 14% 34% 23% 7%	950
December	1st to 10th	Night	21% 12% 39% 22% 5% 1	950
	11th to 20th	Night	23% 14% 35% 23% 5% 1	950
	21st to end	Night	27% 14% 33% 22% 3	1045

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