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 2026-07-31.

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 8% 5% 5% 5% 4 5% 7% 38%	138723
	Night	12% 9% 4 8% 5% 4 4 4 5% 6% 38%	134589
Transparency	Day	44% 5% 11% 25% 13% 1	142195
	Night	45% 5% 11% 23% 14% 2	139193
Seeing	Day	17% 13% 31% 24% 12% 4	18351
	Night	17% 11% 31% 29% 10% 1	28165

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	9% 11% 6% 16% 8% 6% 5% 4 4 5% 25%	4691
	11th to 20th	Day	6% 11% 6% 11% 5% 4 6% 8% 7% 8% 28%	4710
	21st to end	Day	9% 10% 6% 10% 5% 4 6% 3 4 5% 38%	5471
February	1st to 10th	Day	10% 12% 6% 10% 5% 5% 4 4 5% 8% 31%	1890
	11th to 20th	Day	12% 11% 4 8% 5% 5% 5% 3 5% 6% 37%	1933
	21st to end	Day	12% 11% 4 10% 7% 6% 4 4 5% 5% 33%	1730
March	1st to 10th	Day	14% 7% 2 5% 4 4 3 3 5% 6% 47%	4580
	11th to 20th	Day	12% 6% 2 8% 4 4 4 3 5% 8% 43%	4996
	21st to end	Day	23% 11% 3 8% 5% 4 3 3 5% 5% 30%	5958
April	1st to 10th	Day	18% 13% 4 8% 5% 5% 4 4 4 6% 31%	2520
	11th to 20th	Day	17% 10% 4 8% 5% 4 5% 4 5% 6% 33%	2494
	21st to end	Day	18% 10% 3 7% 5% 4 5% 4 5% 6% 32%	2568
May	1st to 10th	Day	11% 7% 2 6% 5% 5% 5% 4 6% 7% 42%	8067
	11th to 20th	Day	14% 6% 2 7% 4 4 5% 4 5% 6% 43%	8222
	21st to end	Day	15% 6% 2 7% 4 5% 4 3 6% 7% 39%	9047
June	1st to 10th	Day	11% 6% 2 7% 4 4 5% 4 5% 9% 42%	2940
	11th to 20th	Day	12% 6% 2 6% 6% 5% 5% 4 7% 9% 39%	2940
	21st to end	Day	13% 6% 3 6% 5% 4 5% 4 7% 9% 39%	2940
July	1st to 10th	Day	8% 5% 2 7% 5% 6% 6% 5% 8% 10% 39%	6500
	11th to 20th	Day	8% 5% 2 5% 4 4 5% 4 6% 8% 49%	6500
	21st to end	Day	10% 6% 2 7% 4 5% 5% 4 6% 9% 41%	7065
August	1st to 10th	Day	9% 6% 2 7% 5% 5% 5% 4 7% 9% 41%	4450
	11th to 20th	Day	12% 5% 2 5% 4 4 4 4 6% 8% 46%	4012
	21st to end	Day	10% 6% 2 6% 5% 4 5% 4 6% 9% 44%	4312
September	1st to 10th	Day	13% 6% 2 6% 4 5% 4 4 5% 9% 44%	2400
	11th to 20th	Day	11% 6% 2 6% 4 3 4 3 6% 8% 47%	2363
	21st to end	Day	12% 7% 2 6% 4 4 4 4 5% 7% 44%	2195
October	1st to 10th	Day	13% 6% 2 6% 4 4 4 3 4 7% 47%	2000
	11th to 20th	Day	18% 9% 3 6% 5% 4 5% 3 4 7% 36%	2000
	21st to end	Day	15% 11% 3 8% 4 3 3 3 4 5% 40%	2035
November	1st to 10th	Day	12% 9% 2 7% 5% 4 4 3 5% 7% 41%	1852
	11th to 20th	Day	14% 13% 4 10% 6% 4 4 3 4 6% 32%	1814
	21st to end	Day	12% 13% 4 9% 5% 5% 3 3 5% 6% 35%	1680
December	1st to 10th	Day	8% 9% 5% 11% 5% 6% 5% 4 6% 7% 34%	2690
	11th to 20th	Day	13% 13% 5% 10% 6% 5% 5% 4 6% 6% 26%	3088
	21st to end	Day	16% 22% 9% 14% 5% 4 5% 4 4 4 15%	4070
January	1st to 10th	Night	10% 12% 6% 12% 7% 5% 4 3 4 5% 32%	8232
	11th to 20th	Night	8% 13% 5% 14% 6% 6% 7% 4 6% 6% 23%	8280
	21st to end	Night	8% 12% 7% 10% 5% 5% 5% 4 5% 6% 32%	8741
February	1st to 10th	Night	9% 14% 4 11% 5% 5% 4 4 5% 6% 33%	2730
	11th to 20th	Night	10% 10% 4 9% 5% 5% 4 4 4 5% 40%	2573
	21st to end	Night	14% 12% 3 8% 5% 4 4 3 5% 6% 35%	2076
March	1st to 10th	Night	14% 8% 3 7% 4 4 4 3 4 5% 44%	5493
	11th to 20th	Night	11% 7% 2 6% 4 4 4 4 6% 7% 44%	5215
	21st to end	Night	22% 12% 3 9% 5% 4 4 3 4 5% 30%	5199
April	1st to 10th	Night	19% 10% 3 7% 4 3 3 3 5% 6% 36%	2100
	11th to 20th	Night	19% 7% 3 7% 4 3 4 3 6% 6% 38%	2075
	21st to end	Night	16% 9% 2 6% 4 3 5% 5% 6% 8% 36%	2050
May	1st to 10th	Night	13% 6% 3 5% 4 4 5% 4 5% 7% 44%	4794
	11th to 20th	Night	11% 5% 2 6% 4 4 5% 4 6% 8% 46%	4670
	21st to end	Night	15% 8% 3 7% 5% 5% 5% 4 5% 7% 38%	5139
June	1st to 10th	Night	10% 5% 2 6% 5% 4 5% 4 6% 8% 45%	1680
	11th to 20th	Night	10% 6% 3 6% 4 3 4 4 6% 9% 45%	1680
	21st to end	Night	11% 5% 2 6% 4 4 4 3 5% 9% 48%	1680
July	1st to 10th	Night	12% 6% 3 6% 4 3 4 4 5% 8% 45%	3698
	11th to 20th	Night	7% 5% 2 5% 3 4 4 4 5% 8% 54%	3697
	21st to end	Night	6% 4 2 6% 4 4 5% 5% 6% 8% 49%	4027
August	1st to 10th	Night	10% 4 2 5% 4 5% 4 3 6% 8% 48%	2694
	11th to 20th	Night	10% 7% 2 6% 3 4 3 3 5% 7% 49%	3040
	21st to end	Night	9% 5% 1 5% 4 4 5% 4 6% 7% 50%	3586
September	1st to 10th	Night	10% 4 1 6% 3 4 3 3 5% 7% 54%	2000
	11th to 20th	Night	13% 4 2 5% 4 3 4 3 4 7% 51%	2015
	21st to end	Night	11% 6% 2 5% 3 3 4 4 4 6% 51%	2201
October	1st to 10th	Night	11% 7% 3 5% 4 4 4 3 4 4 51%	2400
	11th to 20th	Night	16% 7% 2 5% 4 4 4 3 5% 7% 41%	2400
	21st to end	Night	16% 10% 3 7% 3 4 4 4 6% 6% 36%	2805
November	1st to 10th	Night	13% 9% 3 6% 4 4 4 3 5% 5% 44%	2666
	11th to 20th	Night	14% 11% 4 9% 6% 4 4 3 5% 6% 35%	2804
	21st to end	Night	15% 11% 4 8% 5% 4 3 3 4 6% 36%	2940
December	1st to 10th	Night	8% 9% 3 8% 5% 5% 5% 5% 6% 8% 38%	4720
	11th to 20th	Night	13% 17% 6% 11% 6% 5% 4 3 5% 5% 26%	5339
	21st to end	Night	19% 18% 7% 12% 6% 4 4 3 4 5% 19%	7150

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	61% 3 13% 15% 7%	4692
	11th to 20th	Day	51% 4 10% 18% 16% 1	4710
	21st to end	Day	49% 4 10% 24% 12%	5471
February	1st to 10th	Day	52% 5% 13% 17% 11% 1	1890
	11th to 20th	Day	49% 4 12% 23% 10% 2	1942
	21st to end	Day	54% 4 10% 19% 10% 3	1730
March	1st to 10th	Day	39% 4 12% 29% 13% 5%	4580
	11th to 20th	Day	39% 4 14% 28% 13% 2	4996
	21st to end	Day	57% 5% 9% 16% 11% 2	5960
April	1st to 10th	Day	54% 6% 9% 19% 11% 1	2520
	11th to 20th	Day	52% 5% 9% 21% 11% 2	2494
	21st to end	Day	51% 7% 11% 19% 12% 1	2568
May	1st to 10th	Day	39% 6% 8% 29% 17% 2	8104
	11th to 20th	Day	40% 7% 8% 27% 17%	8226
	21st to end	Day	43% 6% 10% 25% 14% 3	9061
June	1st to 10th	Day	37% 7% 13% 27% 14% 2	2940
	11th to 20th	Day	40% 7% 12% 24% 16% 1	2940
	21st to end	Day	41% 8% 14% 23% 13% 1	2940
July	1st to 10th	Day	37% 8% 15% 31% 8% 1	6431
	11th to 20th	Day	31% 7% 13% 33% 16% 1	6425
	21st to end	Day	39% 8% 12% 24% 17% 1	6869
August	1st to 10th	Day	39% 7% 14% 26% 13% 1	4435
	11th to 20th	Day	35% 7% 13% 31% 13% 1	4051
	21st to end	Day	36% 6% 13% 31% 14% 1	4311
September	1st to 10th	Day	37% 7% 12% 26% 17% 1	2400
	11th to 20th	Day	35% 6% 14% 30% 14% 1	2363
	21st to end	Day	39% 5% 11% 29% 15% 1	2195
October	1st to 10th	Day	24% 4 5% 42% 24% 1	3260
	11th to 20th	Day	38% 4 8% 28% 19% 3	3240
	21st to end	Day	43% 4 10% 29% 13% 2	3260
November	1st to 10th	Day	42% 4 14% 23% 15% 2	1852
	11th to 20th	Day	53% 4 12% 21% 9% 1	1814
	21st to end	Day	51% 4 15% 21% 8% 1	1680
December	1st to 10th	Day	49% 5% 18% 20% 7% 1	2690
	11th to 20th	Day	57% 5% 11% 18% 7% 2	3085
	21st to end	Day	73% 4 8% 10% 5%	4070
January	1st to 10th	Night	54% 4 12% 21% 8%	8233
	11th to 20th	Night	61% 4 8% 12% 14% 1	8280
	21st to end	Night	52% 4 11% 20% 13%	8741
February	1st to 10th	Night	52% 4 12% 19% 11% 1	2730
	11th to 20th	Night	46% 5% 11% 25% 12% 1	2574
	21st to end	Night	50% 5% 10% 22% 11% 2	2076
March	1st to 10th	Night	44% 4 11% 24% 10% 7%	5493
	11th to 20th	Night	37% 4 11% 29% 14% 4	5215
	21st to end	Night	58% 4 8% 17% 11% 1	5199
April	1st to 10th	Night	49% 5% 10% 21% 14% 2	2100
	11th to 20th	Night	47% 4 8% 21% 17% 3	2075
	21st to end	Night	45% 6% 12% 22% 13% 2	2050
May	1st to 10th	Night	38% 6% 9% 24% 22% 1	4819
	11th to 20th	Night	36% 6% 13% 22% 21% 1	4671
	21st to end	Night	45% 6% 8% 22% 15% 4	5149
June	1st to 10th	Night	35% 7% 11% 28% 17% 1	1680
	11th to 20th	Night	36% 6% 11% 26% 19% 2	1680
	21st to end	Night	34% 7% 14% 25% 16% 4	1680
July	1st to 10th	Night	37% 6% 13% 29% 12% 2	3660
	11th to 20th	Night	28% 6% 14% 33% 18% 2	3652
	21st to end	Night	31% 7% 16% 24% 19% 3	3912
August	1st to 10th	Night	34% 6% 13% 27% 19% 2	2685
	11th to 20th	Night	34% 6% 12% 31% 15% 1	3067
	21st to end	Night	32% 6% 13% 27% 19% 3	3586
September	1st to 10th	Night	30% 6% 10% 30% 22% 1	2000
	11th to 20th	Night	34% 5% 11% 34% 15% 2	2015
	21st to end	Night	33% 5% 10% 30% 21% 1	2201
October	1st to 10th	Night	27% 3 5% 34% 28% 2	3920
	11th to 20th	Night	32% 5% 10% 29% 22% 2	3899
	21st to end	Night	44% 5% 9% 26% 16% 1	4530
November	1st to 10th	Night	42% 4 11% 25% 16% 2	2666
	11th to 20th	Night	51% 5% 12% 20% 10% 2	2804
	21st to end	Night	50% 4 13% 24% 8% 1	2940
December	1st to 10th	Night	44% 5% 18% 25% 8% 1	4720
	11th to 20th	Night	61% 4 10% 15% 9% 1	5341
	21st to end	Night	69% 5% 7% 13% 7%	7150

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% 16% 36% 21% 8% 2	330
	11th to 20th	Day	20% 18% 38% 16% 6% 1	330
	21st to end	Day	20% 18% 35% 23% 4 1	363
February	1st to 10th	Day	15% 21% 42% 18% 4 1	330
	11th to 20th	Day	22% 23% 33% 17% 4	330
	21st to end	Day	21% 21% 44% 12% 2	273
March	1st to 10th	Day	20% 20% 41% 15% 5%	330
	11th to 20th	Day	26% 18% 35% 13% 5% 3	330
	21st to end	Day	29% 16% 28% 19% 5% 1	531
April	1st to 10th	Day	28% 17% 35% 16% 4	540
	11th to 20th	Day	28% 20% 25% 16% 10% 2	532
	21st to end	Day	23% 16% 30% 21% 9% 1	540
May	1st to 10th	Day	19% 16% 35% 21% 8% 2	698
	11th to 20th	Day	20% 14% 31% 22% 9% 3	775
	21st to end	Day	19% 11% 27% 26% 12% 5%	844
June	1st to 10th	Day	11% 10% 29% 33% 14% 3	780
	11th to 20th	Day	13% 12% 36% 23% 13% 3	780
	21st to end	Day	15% 11% 29% 27% 14% 4	780
July	1st to 10th	Day	8% 6% 23% 32% 22% 10%	771
	11th to 20th	Day	9% 7% 27% 29% 20% 7%	768
	21st to end	Day	8% 5% 29% 32% 19% 6%	845
August	1st to 10th	Day	8% 4 24% 32% 24% 8%	726
	11th to 20th	Day	14% 7% 19% 28% 22% 10%	621
	21st to end	Day	11% 8% 24% 30% 19% 8%	583
September	1st to 10th	Day	17% 8% 22% 29% 16% 8%	530
	11th to 20th	Day	12% 5% 22% 33% 21% 7%	530
	21st to end	Day	16% 11% 26% 24% 18% 6%	525
October	1st to 10th	Day	16% 13% 32% 24% 13% 2	330
	11th to 20th	Day	23% 20% 32% 18% 6%	330
	21st to end	Day	23% 18% 36% 15% 6% 2	363
November	1st to 10th	Day	18% 18% 40% 18% 5% 1	330
	11th to 20th	Day	24% 18% 36% 17% 6%	330
	21st to end	Day	24% 17% 40% 14% 5%	330
December	1st to 10th	Day	14% 20% 43% 16% 5% 1	330
	11th to 20th	Day	20% 17% 37% 19% 6% 1	330
	21st to end	Day	28% 18% 37% 15% 2	363
January	1st to 10th	Night	15% 16% 36% 25% 7%	1050
	11th to 20th	Night	19% 16% 35% 24% 4 1	1050
	21st to end	Night	20% 12% 38% 24% 5% 1	1155
February	1st to 10th	Night	15% 17% 38% 23% 6% 1	1050
	11th to 20th	Night	17% 16% 37% 26% 4	939
	21st to end	Night	21% 15% 39% 21% 4	692
March	1st to 10th	Night	21% 14% 35% 24% 6% 1	840
	11th to 20th	Night	19% 12% 38% 23% 6% 1	690
	21st to end	Night	22% 11% 32% 27% 7% 1	693
April	1st to 10th	Night	23% 14% 35% 24% 4	630
	11th to 20th	Night	25% 11% 29% 29% 6%	623
	21st to end	Night	21% 12% 30% 30% 6% 1	630
May	1st to 10th	Night	22% 9% 33% 31% 6%	630
	11th to 20th	Night	17% 10% 32% 31% 10%	621
	21st to end	Night	15% 6% 29% 36% 14% 1	683
June	1st to 10th	Night	11% 6% 30% 41% 11%	630
	11th to 20th	Night	13% 6% 32% 36% 13%	630
	21st to end	Night	12% 6% 25% 39% 16% 1	630
July	1st to 10th	Night	9% 4 17% 39% 28% 3	615
	11th to 20th	Night	9% 3 23% 41% 22% 2	612
	21st to end	Night	6% 3 19% 48% 22% 2	687
August	1st to 10th	Night	7% 4 16% 44% 26% 3	597
	11th to 20th	Night	11% 3 16% 39% 26% 4	594
	21st to end	Night	10% 2 20% 42% 22% 3	660
September	1st to 10th	Night	12% 5% 23% 37% 19% 6%	600
	11th to 20th	Night	14% 5% 21% 33% 23% 4	615
	21st to end	Night	13% 8% 26% 34% 18% 2	800
October	1st to 10th	Night	15% 8% 28% 32% 16% 1	800
	11th to 20th	Night	20% 11% 34% 28% 7%	800
	21st to end	Night	22% 12% 31% 28% 7%	880
November	1st to 10th	Night	17% 12% 37% 24% 9%	820
	11th to 20th	Night	20% 16% 38% 20% 6%	914
	21st to end	Night	21% 16% 33% 23% 6%	1050
December	1st to 10th	Night	20% 13% 39% 22% 5% 1	1050
	11th to 20th	Night	22% 16% 34% 23% 4 1	1050
	21st to end	Night	27% 14% 32% 23% 3	1155

Page generated at 2026-07-28 02:25:25. Version ac07

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