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 2025-03-27.

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% 9% 3 8% 5% 5% 5% 4 5% 7% 37%	109126
	Night	12% 9% 4 8% 5% 4 4 4 5% 6% 38%	110396
Transparency	Day	44% 6% 12% 24% 13% 1	112643
	Night	45% 5% 11% 23% 14% 2	115019
Seeing	Day	17% 13% 30% 24% 12% 4	16367
	Night	17% 11% 32% 29% 10% 1	26428

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	7% 10% 6% 17% 8% 7% 4 3 4 5% 27%	3617
	11th to 20th	Day	7% 11% 7% 11% 5% 5% 6% 8% 7% 8% 27%	3620
	21st to end	Day	11% 13% 7% 11% 4 3 4 3 4 5% 36%	4228
February	1st to 10th	Day	10% 12% 6% 10% 5% 5% 5% 4 5% 8% 31%	1800
	11th to 20th	Day	12% 11% 4 8% 5% 5% 5% 3 5% 6% 36%	1839
	21st to end	Day	12% 11% 4 10% 6% 6% 4 4 5% 5% 32%	1650
March	1st to 10th	Day	15% 7% 3 5% 4 4 3 2 5% 6% 47%	3220
	11th to 20th	Day	11% 6% 2 10% 5% 4 4 3 5% 7% 43%	3524
	21st to end	Day	22% 13% 3 9% 5% 4 3 3 5% 5% 28%	4138
April	1st to 10th	Day	18% 13% 4 8% 5% 5% 4 4 5% 6% 31%	2280
	11th to 20th	Day	18% 10% 4 8% 5% 4 5% 4 5% 6% 33%	2254
	21st to end	Day	19% 10% 3 7% 5% 4 5% 4 5% 6% 32%	2323
May	1st to 10th	Day	15% 8% 3 7% 5% 5% 5% 4 5% 7% 37%	4324
	11th to 20th	Day	13% 6% 3 6% 4 4 4 4 5% 7% 44%	4399
	21st to end	Day	15% 7% 2 6% 5% 5% 5% 4 6% 7% 38%	4824
June	1st to 10th	Day	11% 5% 2 6% 4 4 5% 4 5% 9% 43%	2660
	11th to 20th	Day	12% 6% 2 7% 6% 5% 4 4 6% 9% 40%	2660
	21st to end	Day	13% 6% 3 6% 4 5% 5% 5% 7% 8% 39%	2660
July	1st to 10th	Day	10% 5% 2 8% 5% 6% 6% 5% 8% 9% 35%	4440
	11th to 20th	Day	5% 3 1 5% 4 5% 5% 4 7% 9% 51%	4440
	21st to end	Day	9% 6% 3 7% 5% 5% 5% 5% 6% 8% 42%	4813
August	1st to 10th	Day	9% 6% 2 7% 5% 5% 5% 4 7% 9% 41%	4313
	11th to 20th	Day	12% 5% 2 5% 4 4 4 4 6% 8% 47%	3887
	21st to end	Day	10% 6% 2 6% 5% 4 5% 5% 6% 9% 43%	4180
September	1st to 10th	Day	13% 6% 2 6% 4 5% 4 4 5% 8% 44%	2280
	11th to 20th	Day	12% 6% 2 6% 4 3 5% 3 5% 7% 47%	2245
	21st to end	Day	12% 7% 2 6% 4 4 4 4 5% 7% 44%	2085
October	1st to 10th	Day	13% 6% 2 6% 4 4 4 3 4 7% 47%	1900
	11th to 20th	Day	18% 9% 3 6% 5% 4 5% 3 4 7% 36%	1900
	21st to end	Day	16% 10% 3 8% 4 3 3 3 4 5% 40%	1933
November	1st to 10th	Day	12% 9% 2 6% 5% 5% 4 3 5% 7% 42%	1762
	11th to 20th	Day	14% 13% 4 10% 6% 4 4 3 4 6% 32%	1728
	21st to end	Day	13% 12% 4 8% 5% 5% 3 3 5% 6% 37%	1600
December	1st to 10th	Day	8% 9% 5% 11% 5% 6% 5% 4 6% 7% 35%	2610
	11th to 20th	Day	13% 14% 5% 11% 6% 5% 5% 4 6% 6% 26%	3008
	21st to end	Day	16% 22% 8% 14% 5% 4 5% 4 4 4 15%	3982
January	1st to 10th	Night	7% 10% 6% 14% 7% 5% 4 3 5% 5% 33%	6348
	11th to 20th	Night	10% 12% 5% 14% 6% 5% 6% 4 6% 6% 24%	6360
	21st to end	Night	11% 14% 8% 11% 4 4 4 3 5% 6% 30%	6748
February	1st to 10th	Night	9% 14% 4 11% 5% 5% 4 4 5% 6% 33%	2600
	11th to 20th	Night	10% 10% 4 9% 5% 5% 4 4 4 5% 40%	2448
	21st to end	Night	14% 12% 3 8% 5% 4 4 3 5% 5% 36%	1980
March	1st to 10th	Night	15% 9% 3 6% 4 4 4 3 4 5% 43%	3853
	11th to 20th	Night	11% 7% 2 6% 4 5% 4 4 6% 7% 43%	3673
	21st to end	Night	22% 11% 3 11% 5% 3 4 2 3 5% 30%	3617
April	1st to 10th	Night	19% 11% 2 7% 5% 3 3 3 5% 6% 37%	1900
	11th to 20th	Night	19% 7% 3 7% 4 3 3 3 6% 6% 38%	1875
	21st to end	Night	16% 9% 2 6% 4 3 5% 5% 6% 8% 36%	1855
May	1st to 10th	Night	16% 8% 3 6% 4 4 5% 4 6% 8% 35%	2577
	11th to 20th	Night	11% 6% 2 6% 4 4 4 4 6% 6% 46%	2506
	21st to end	Night	12% 7% 3 6% 5% 4 5% 3 5% 7% 42%	2743
June	1st to 10th	Night	9% 5% 2 6% 5% 4 5% 5% 6% 8% 45%	1520
	11th to 20th	Night	11% 6% 3 5% 4 3 4 3 6% 9% 46%	1520
	21st to end	Night	10% 5% 2 6% 4 4 3 3 6% 9% 49%	1520
July	1st to 10th	Night	13% 6% 2 6% 4 3 4 3 5% 7% 45%	2530
	11th to 20th	Night	4 3 2 5% 4 4 4 4 5% 9% 56%	2530
	21st to end	Night	6% 4 2 6% 4 5% 5% 5% 6% 8% 48%	2750
August	1st to 10th	Night	10% 5% 2 5% 4 5% 4 3 6% 8% 48%	2611
	11th to 20th	Night	10% 6% 2 6% 3 4 3 3 5% 7% 50%	2945
	21st to end	Night	9% 5% 1 5% 4 4 5% 4 6% 7% 50%	3476
September	1st to 10th	Night	10% 4 1 6% 3 4 3 3 5% 7% 54%	1900
	11th to 20th	Night	13% 4 2 5% 4 3 4 3 4 6% 52%	1914
	21st to end	Night	11% 6% 2 5% 3 4 4 4 4 6% 51%	2091
October	1st to 10th	Night	11% 7% 2 5% 4 4 4 3 4 4 51%	2280
	11th to 20th	Night	16% 7% 2 5% 5% 4 4 3 6% 7% 42%	2280
	21st to end	Night	17% 10% 3 7% 4 4 4 4 6% 6% 36%	2665
November	1st to 10th	Night	13% 8% 3 6% 4 4 3 4 4 5% 44%	2536
	11th to 20th	Night	14% 11% 4 9% 6% 4 4 3 5% 6% 34%	2670
	21st to end	Night	16% 10% 4 7% 5% 4 4 3 5% 6% 36%	2800
December	1st to 10th	Night	8% 8% 3 8% 5% 5% 5% 5% 6% 8% 38%	4580
	11th to 20th	Night	13% 17% 6% 11% 5% 5% 4 3 4 5% 26%	5199
	21st to end	Night	19% 18% 7% 12% 6% 4 4 3 4 5% 18%	6996

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	60% 3 12% 18% 7%	3618
	11th to 20th	Day	53% 4 11% 14% 18% 1	3620
	21st to end	Day	52% 4 12% 19% 12%	4228
February	1st to 10th	Day	52% 5% 13% 17% 12% 1	1800
	11th to 20th	Day	50% 4 13% 22% 9% 2	1848
	21st to end	Day	54% 5% 10% 19% 10% 3	1650
March	1st to 10th	Day	40% 4 10% 28% 14% 3	3220
	11th to 20th	Day	40% 4 11% 30% 13% 1	3524
	21st to end	Day	58% 5% 10% 16% 9% 2	4138
April	1st to 10th	Day	54% 6% 10% 19% 11% 1	2280
	11th to 20th	Day	52% 5% 8% 21% 12% 2	2254
	21st to end	Day	51% 7% 11% 18% 12% 1	2323
May	1st to 10th	Day	44% 6% 10% 23% 16% 1	4364
	11th to 20th	Day	39% 6% 10% 32% 13%	4403
	21st to end	Day	43% 7% 10% 22% 15% 2	4837
June	1st to 10th	Day	36% 7% 14% 27% 14% 2	2660
	11th to 20th	Day	40% 7% 11% 24% 17% 1	2660
	21st to end	Day	41% 8% 14% 23% 14% 2	2660
July	1st to 10th	Day	42% 9% 14% 27% 7% 2	4371
	11th to 20th	Day	27% 7% 14% 33% 17% 1	4365
	21st to end	Day	38% 8% 13% 22% 18% 2	4662
August	1st to 10th	Day	39% 7% 14% 26% 13% 1	4298
	11th to 20th	Day	35% 7% 13% 31% 14% 1	3926
	21st to end	Day	36% 6% 13% 31% 14% 1	4179
September	1st to 10th	Day	38% 7% 12% 25% 17% 1	2280
	11th to 20th	Day	35% 5% 13% 30% 15% 1	2245
	21st to end	Day	39% 5% 11% 29% 14% 1	2085
October	1st to 10th	Day	24% 4 5% 42% 23% 1	3160
	11th to 20th	Day	37% 4 9% 29% 19% 3	3140
	21st to end	Day	43% 4 10% 29% 13% 2	3158
November	1st to 10th	Day	42% 4 14% 23% 14% 2	1762
	11th to 20th	Day	54% 4 12% 19% 10% 1	1728
	21st to end	Day	50% 4 16% 22% 8% 1	1600
December	1st to 10th	Day	48% 5% 18% 21% 7% 1	2610
	11th to 20th	Day	57% 5% 11% 18% 7% 2	3005
	21st to end	Day	73% 4 8% 10% 5%	3982
January	1st to 10th	Night	52% 5% 10% 22% 11% 1	6348
	11th to 20th	Night	59% 4 8% 12% 16% 1	6360
	21st to end	Night	55% 5% 11% 18% 12%	6748
February	1st to 10th	Night	53% 4 12% 18% 12% 2	2600
	11th to 20th	Night	47% 5% 11% 24% 12% 1	2449
	21st to end	Night	50% 5% 10% 21% 12% 2	1980
March	1st to 10th	Night	44% 5% 10% 26% 10% 5%	3853
	11th to 20th	Night	37% 5% 10% 27% 18% 3	3673
	21st to end	Night	59% 4 6% 19% 10% 2	3617
April	1st to 10th	Night	49% 5% 10% 21% 13% 2	1900
	11th to 20th	Night	46% 4 8% 20% 17% 3	1875
	21st to end	Night	44% 6% 12% 22% 14% 2	1855
May	1st to 10th	Night	45% 7% 13% 16% 19%	2602
	11th to 20th	Night	37% 8% 10% 25% 19% 1	2507
	21st to end	Night	39% 7% 10% 22% 19% 2	2751
June	1st to 10th	Night	34% 8% 12% 28% 17% 1	1520
	11th to 20th	Night	35% 6% 11% 27% 20% 2	1520
	21st to end	Night	32% 8% 14% 25% 16% 4	1520
July	1st to 10th	Night	38% 6% 15% 25% 13% 3	2490
	11th to 20th	Night	24% 7% 15% 34% 18% 2	2482
	21st to end	Night	31% 8% 15% 23% 19% 4	2662
August	1st to 10th	Night	34% 6% 13% 26% 19% 1	2602
	11th to 20th	Night	34% 6% 12% 31% 16% 1	2972
	21st to end	Night	33% 6% 13% 26% 19% 3	3476
September	1st to 10th	Night	30% 6% 10% 29% 22% 1	1900
	11th to 20th	Night	34% 5% 10% 34% 16% 2	1914
	21st to end	Night	34% 5% 10% 30% 20% 1	2091
October	1st to 10th	Night	27% 3 5% 34% 28% 1	3800
	11th to 20th	Night	31% 5% 10% 30% 23% 2	3779
	21st to end	Night	45% 5% 9% 25% 15% 1	4390
November	1st to 10th	Night	42% 4 11% 25% 16% 2	2536
	11th to 20th	Night	51% 5% 12% 19% 11% 2	2670
	21st to end	Night	49% 4 13% 23% 9% 1	2800
December	1st to 10th	Night	43% 5% 18% 26% 7% 1	4580
	11th to 20th	Night	61% 4 10% 15% 9% 1	5201
	21st to end	Night	69% 5% 7% 13% 7%	6996

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	15% 16% 36% 23% 8% 2	300
	11th to 20th	Day	20% 18% 37% 17% 7% 1	300
	21st to end	Day	20% 18% 35% 23% 4 1	330
February	1st to 10th	Day	16% 20% 42% 18% 4 1	300
	11th to 20th	Day	22% 23% 33% 17% 4	300
	21st to end	Day	20% 22% 44% 12% 2	249
March	1st to 10th	Day	19% 19% 42% 15% 5%	300
	11th to 20th	Day	26% 19% 33% 14% 5% 3	300
	21st to end	Day	30% 16% 27% 20% 6% 1	470
April	1st to 10th	Day	29% 16% 34% 18% 4	460
	11th to 20th	Day	27% 20% 25% 16% 10% 2	452
	21st to end	Day	23% 15% 29% 21% 10% 1	460
May	1st to 10th	Day	20% 15% 35% 21% 8% 1	603
	11th to 20th	Day	20% 13% 32% 23% 9% 3	675
	21st to end	Day	19% 11% 27% 25% 13% 5%	734
June	1st to 10th	Day	11% 10% 29% 32% 14% 4	680
	11th to 20th	Day	13% 10% 35% 24% 14% 4	680
	21st to end	Day	16% 10% 28% 27% 15% 4	680
July	1st to 10th	Day	8% 6% 21% 32% 23% 11%	671
	11th to 20th	Day	9% 7% 29% 30% 19% 7%	668
	21st to end	Day	8% 5% 29% 32% 20% 7%	739
August	1st to 10th	Day	8% 4 24% 33% 24% 7%	676
	11th to 20th	Day	14% 7% 19% 28% 22% 10%	576
	21st to end	Day	12% 8% 24% 29% 20% 8%	539
September	1st to 10th	Day	18% 7% 22% 29% 17% 7%	490
	11th to 20th	Day	13% 5% 22% 32% 20% 7%	490
	21st to end	Day	17% 11% 26% 25% 17% 4	485
October	1st to 10th	Day	17% 14% 31% 23% 12% 2	300
	11th to 20th	Day	22% 22% 30% 19% 6%	300
	21st to end	Day	23% 19% 37% 15% 5% 2	330
November	1st to 10th	Day	18% 16% 41% 18% 6% 1	300
	11th to 20th	Day	23% 17% 38% 16% 6%	300
	21st to end	Day	25% 16% 40% 14% 5%	300
December	1st to 10th	Day	15% 21% 43% 16% 5% 1	300
	11th to 20th	Day	21% 17% 36% 19% 7% 1	300
	21st to end	Day	28% 18% 36% 16% 2	330
January	1st to 10th	Night	15% 16% 36% 26% 7% 1	1000
	11th to 20th	Night	19% 15% 35% 25% 4 1	1000
	21st to end	Night	20% 12% 38% 24% 5% 1	1100
February	1st to 10th	Night	16% 17% 38% 24% 6% 1	1000
	11th to 20th	Night	17% 16% 38% 25% 4	894
	21st to end	Night	21% 15% 39% 20% 5%	660
March	1st to 10th	Night	21% 14% 35% 24% 6% 1	800
	11th to 20th	Night	18% 12% 38% 24% 7% 1	657
	21st to end	Night	23% 10% 31% 28% 8% 1	647
April	1st to 10th	Night	22% 13% 36% 25% 5%	570
	11th to 20th	Night	24% 11% 30% 29% 6%	563
	21st to end	Night	21% 12% 31% 29% 7% 1	570
May	1st to 10th	Night	23% 9% 33% 29% 5% 1	570
	11th to 20th	Night	17% 9% 32% 31% 9% 1	561
	21st to end	Night	14% 6% 29% 35% 15% 1	617
June	1st to 10th	Night	10% 6% 31% 41% 12%	570
	11th to 20th	Night	13% 4 32% 36% 14%	570
	21st to end	Night	12% 5% 26% 38% 17% 1	570
July	1st to 10th	Night	8% 4 17% 39% 28% 3	555
	11th to 20th	Night	8% 3 24% 40% 22% 2	552
	21st to end	Night	6% 2 20% 46% 23% 2	624
August	1st to 10th	Night	8% 4 17% 44% 26% 3	567
	11th to 20th	Night	10% 3 16% 39% 26% 5%	564
	21st to end	Night	10% 2 20% 42% 22% 3	627
September	1st to 10th	Night	12% 5% 23% 37% 19% 5%	570
	11th to 20th	Night	15% 5% 22% 32% 22% 4	584
	21st to end	Night	14% 8% 27% 33% 17% 1	760
October	1st to 10th	Night	16% 8% 28% 31% 16% 1	760
	11th to 20th	Night	19% 11% 34% 28% 7%	760
	21st to end	Night	22% 12% 31% 27% 7%	836
November	1st to 10th	Night	17% 11% 37% 24% 10% 1	780
	11th to 20th	Night	20% 16% 38% 20% 6%	870
	21st to end	Night	22% 15% 34% 23% 6%	1000
December	1st to 10th	Night	20% 13% 39% 23% 5% 1	1000
	11th to 20th	Night	23% 14% 35% 24% 5% 1	1000
	21st to end	Night	27% 14% 32% 23% 4	1100

Page generated at 2025-03-24 08:04:29. Version ac07

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