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 2024-10-20.

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% 3 8% 5% 5% 5% 4 5% 7% 38%	101375
	Night	13% 9% 4 8% 5% 4 4 4 5% 6% 39%	97373
Transparency	Day	45% 6% 12% 24% 12% 1	101167
	Night	46% 6% 11% 23% 13% 2	97252
Seeing	Day	17% 12% 30% 24% 12% 4	15890
	Night	17% 10% 31% 29% 11% 1	25719

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% 14% 8% 16% 7% 5% 3 3 4 4 26%	2527
	11th to 20th	Day	10% 13% 5% 13% 6% 6% 6% 9% 6% 7% 20%	2530
	21st to end	Day	15% 17% 9% 14% 5% 4 3 2 4 5% 22%	2945
February	1st to 10th	Day	10% 13% 6% 9% 5% 5% 4 4 5% 8% 31%	1710
	11th to 20th	Day	12% 10% 4 8% 5% 5% 5% 3 5% 6% 36%	1744
	21st to end	Day	12% 12% 4 10% 6% 6% 4 4 5% 6% 31%	1570
March	1st to 10th	Day	14% 7% 3 5% 4 4 3 2 5% 6% 46%	3120
	11th to 20th	Day	11% 6% 2 10% 5% 4 5% 3 5% 7% 43%	3416
	21st to end	Day	22% 13% 3 9% 5% 4 3 3 5% 5% 28%	4069
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% 35%	1890
	21st to end	Day	17% 11% 3 8% 4 3 3 3 4 6% 39%	1832
November	1st to 10th	Day	12% 9% 2 6% 5% 5% 4 3 5% 8% 42%	1672
	11th to 20th	Day	14% 12% 4 11% 5% 4 4 3 4 6% 32%	1642
	21st to end	Day	13% 11% 4 8% 5% 5% 3 3 5% 6% 38%	1520
December	1st to 10th	Day	13% 13% 5% 9% 5% 6% 4 3 4 7% 30%	1520
	11th to 20th	Day	13% 13% 5% 10% 5% 4 5% 4 6% 6% 29%	1918
	21st to end	Day	17% 21% 8% 13% 4 4 4 3 3 4 18%	2783
January	1st to 10th	Night	10% 13% 7% 12% 6% 5% 4 3 4 4 31%	4428
	11th to 20th	Night	11% 13% 6% 16% 7% 5% 5% 4 6% 6% 22%	4440
	21st to end	Night	15% 17% 9% 12% 5% 4 4 3 4 5% 23%	4720
February	1st to 10th	Night	9% 14% 4 11% 5% 5% 4 4 5% 6% 33%	2470
	11th to 20th	Night	10% 10% 3 8% 5% 5% 4 4 5% 5% 40%	2323
	21st to end	Night	15% 13% 4 8% 5% 4 4 3 5% 5% 35%	1884
March	1st to 10th	Night	15% 9% 3 6% 4 4 4 3 4 5% 43%	3733
	11th to 20th	Night	11% 7% 2 7% 4 5% 4 4 6% 7% 43%	3560
	21st to end	Night	23% 11% 3 11% 5% 3 4 2 3 5% 30%	3548
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%	2275
	21st to end	Night	17% 10% 3 7% 4 4 4 4 5% 6% 36%	2524
November	1st to 10th	Night	13% 8% 3 6% 4 4 4 4 4 5% 45%	2406
	11th to 20th	Night	14% 10% 4 10% 6% 4 4 3 5% 6% 34%	2536
	21st to end	Night	16% 10% 4 7% 5% 4 4 3 5% 6% 38%	2660
December	1st to 10th	Night	13% 12% 5% 9% 5% 5% 4 5% 6% 6% 30%	2660
	11th to 20th	Night	13% 14% 5% 11% 6% 5% 5% 3 4 5% 28%	3279
	21st to end	Night	19% 17% 5% 12% 6% 4 4 3 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	49% 4 13% 22% 10% 2	1753
	21st to end	Day	54% 5% 10% 18% 10% 3	1570
March	1st to 10th	Day	40% 4 10% 28% 14% 3	3120
	11th to 20th	Day	40% 4 11% 30% 12% 1	3416
	21st to end	Day	58% 5% 10% 17% 9% 2	4069
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	39% 5% 9% 32% 14% 1	1900
	11th to 20th	Day	49% 5% 11% 22% 12% 1	1890
	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% 11% 24% 13% 2	2324
	21st to end	Night	51% 5% 10% 21% 11% 2	1884
March	1st to 10th	Night	44% 5% 10% 26% 10% 5%	3733
	11th to 20th	Night	37% 5% 10% 27% 18% 3	3560
	21st to end	Night	59% 4 6% 19% 9% 2	3548
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	37% 5% 8% 29% 19% 1	2280
	11th to 20th	Night	41% 6% 12% 23% 17% 1	2275
	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	21% 24% 33% 17% 5%	270
	21st to end	Day	20% 21% 45% 12% 2	225
March	1st to 10th	Day	19% 18% 42% 16% 5%	270
	11th to 20th	Day	24% 20% 32% 15% 5% 3	270
	21st to end	Day	30% 15% 27% 20% 6% 2	449
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	23% 22% 29% 20% 6%	297
	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%	849
	21st to end	Night	22% 15% 38% 20% 5%	628
March	1st to 10th	Night	21% 14% 34% 24% 7% 1	760
	11th to 20th	Night	18% 12% 38% 24% 7% 1	624
	21st to end	Night	23% 10% 31% 27% 8% 1	627
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%	759
	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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