Badger Prairie County Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Badger Prairie County Park clear sky chart from 2005-11-06 to 2025-09-04.

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% 8% 3 7% 5% 4 4 4 6% 7% 38%	126433
	Night	13% 9% 4 8% 4 4 4 3 5% 6% 39%	122564
Transparency	Day	44% 5% 12% 25% 13% 1	129915
	Night	45% 4 11% 23% 15% 2	127155
Seeing	Day	17% 11% 29% 25% 14% 5%	17078
	Night	17% 10% 31% 30% 11% 1	26870

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	8% 11% 7% 15% 6% 7% 5% 4 6% 5% 26%	3617
	11th to 20th	Day	7% 10% 7% 12% 5% 4 5% 6% 6% 7% 31%	3620
	21st to end	Day	12% 13% 7% 9% 4 3 3 2 4 6% 35%	4194
February	1st to 10th	Day	11% 13% 6% 10% 5% 5% 4 4 5% 7% 30%	1800
	11th to 20th	Day	13% 12% 4 7% 5% 4 4 3 5% 6% 36%	1876
	21st to end	Day	12% 13% 4 10% 6% 4 5% 3 4 6% 33%	1650
March	1st to 10th	Day	15% 7% 3 5% 4 3 3 3 5% 6% 46%	4480
	11th to 20th	Day	12% 6% 2 7% 5% 4 5% 3 6% 8% 43%	4832
	21st to end	Day	22% 11% 4 10% 5% 4 4 3 4 5% 29%	5889
April	1st to 10th	Day	18% 12% 3 8% 5% 4 5% 3 5% 6% 31%	2400
	11th to 20th	Day	17% 10% 3 7% 6% 5% 4 3 5% 7% 34%	2374
	21st to end	Day	18% 10% 3 8% 5% 5% 5% 3 4 6% 33%	2460
May	1st to 10th	Day	15% 7% 2 6% 4 4 4 4 6% 7% 40%	6083
	11th to 20th	Day	14% 6% 2 7% 4 5% 4 4 6% 7% 42%	6319
	21st to end	Day	15% 6% 2 6% 4 4 5% 4 6% 9% 39%	6935
June	1st to 10th	Day	10% 5% 2 6% 6% 4 5% 4 6% 8% 44%	2800
	11th to 20th	Day	12% 5% 2 6% 4 4 4 4 7% 9% 41%	2800
	21st to end	Day	11% 6% 1 7% 5% 4 5% 4 6% 10% 40%	2800
July	1st to 10th	Day	9% 6% 2 7% 4 5% 5% 5% 7% 10% 40%	6360
	11th to 20th	Day	8% 5% 2 5% 4 5% 5% 4 6% 8% 47%	6360
	21st to end	Day	10% 6% 2 7% 5% 5% 5% 4 6% 9% 40%	6924
August	1st to 10th	Day	11% 5% 2 6% 4 5% 5% 4 6% 9% 42%	4476
	11th to 20th	Day	11% 5% 2 6% 3 4 5% 3 6% 8% 47%	3947
	21st to end	Day	10% 6% 2 6% 4 4 4 4 7% 9% 46%	4312
September	1st to 10th	Day	13% 5% 2 6% 4 4 4 4 6% 7% 45%	2316
	11th to 20th	Day	13% 4 1 4 4 3 4 3 6% 8% 50%	2223
	21st to end	Day	13% 6% 3 6% 5% 5% 4 3 4 7% 45%	2090
October	1st to 10th	Day	14% 6% 2 6% 4 3 3 3 5% 7% 47%	1933
	11th to 20th	Day	18% 9% 3 7% 5% 4 3 3 5% 6% 37%	1900
	21st to end	Day	18% 10% 3 6% 4 4 3 3 4 5% 39%	1919
November	1st to 10th	Day	12% 8% 3 6% 6% 3 4 3 5% 7% 44%	1762
	11th to 20th	Day	14% 12% 3 8% 5% 5% 4 3 5% 7% 33%	1782
	21st to end	Day	14% 13% 3 9% 5% 4 3 3 4 6% 36%	1600
December	1st to 10th	Day	8% 10% 3 8% 4 5% 5% 4 7% 7% 38%	2610
	11th to 20th	Day	12% 15% 4 11% 6% 5% 6% 3 6% 7% 25%	3008
	21st to end	Day	19% 22% 8% 12% 5% 4 3 3 5% 5% 14%	3982
January	1st to 10th	Night	9% 10% 7% 14% 7% 4 4 3 5% 6% 33%	6348
	11th to 20th	Night	11% 12% 7% 13% 6% 5% 5% 5% 7% 6% 25%	6360
	21st to end	Night	12% 14% 7% 10% 5% 4 4 4 4 5% 31%	6770
February	1st to 10th	Night	11% 14% 4 9% 6% 5% 5% 3 5% 6% 33%	2600
	11th to 20th	Night	12% 10% 3 9% 5% 5% 4 3 5% 5% 39%	2411
	21st to end	Night	16% 11% 3 8% 4 4 3 3 5% 5% 36%	1980
March	1st to 10th	Night	16% 8% 3 7% 4 4 4 3 4 4 43%	5373
	11th to 20th	Night	9% 7% 2 6% 4 3 4 3 6% 8% 48%	5171
	21st to end	Night	22% 12% 5% 9% 5% 4 4 3 4 5% 27%	5039
April	1st to 10th	Night	17% 9% 2 6% 5% 4 5% 3 5% 6% 37%	2000
	11th to 20th	Night	19% 8% 3 7% 4 3 4 4 4 6% 38%	1975
	21st to end	Night	18% 7% 2 6% 5% 4 4 3 6% 8% 38%	1940
May	1st to 10th	Night	17% 7% 2 7% 4 3 4 4 5% 7% 40%	3818
	11th to 20th	Night	10% 6% 2 6% 4 4 5% 4 5% 8% 47%	3596
	21st to end	Night	15% 8% 2 7% 4 4 5% 4 5% 7% 40%	3942
June	1st to 10th	Night	9% 4 2 6% 4 4 4 4 8% 9% 46%	1600
	11th to 20th	Night	13% 5% 2 5% 3 3 5% 3 6% 9% 45%	1600
	21st to end	Night	10% 6% 2 5% 5% 3 4 3 6% 6% 50%	1600
July	1st to 10th	Night	13% 6% 2 6% 3 4 5% 4 5% 9% 44%	3618
	11th to 20th	Night	6% 5% 2 6% 4 4 4 3 5% 8% 53%	3617
	21st to end	Night	7% 5% 2 6% 4 5% 5% 4 6% 8% 50%	3947
August	1st to 10th	Night	10% 4 2 6% 3 4 3 4 6% 7% 51%	2680
	11th to 20th	Night	10% 6% 2 5% 3 4 4 3 5% 8% 50%	3105
	21st to end	Night	10% 4 2 5% 4 4 5% 4 5% 7% 50%	3586
September	1st to 10th	Night	9% 4 2 4 3 3 4 2 5% 8% 55%	1930
	11th to 20th	Night	11% 5% 1 5% 3 4 4 3 5% 7% 52%	1938
	21st to end	Night	10% 5% 2 5% 4 3 4 4 6% 6% 51%	2090
October	1st to 10th	Night	11% 6% 2 6% 4 3 4 3 5% 6% 51%	2245
	11th to 20th	Night	15% 7% 2 5% 4 4 3 3 5% 6% 45%	2280
	21st to end	Night	18% 9% 3 6% 4 4 4 3 6% 6% 37%	2679
November	1st to 10th	Night	12% 9% 3 5% 4 4 3 4 4 5% 47%	2536
	11th to 20th	Night	14% 11% 4 9% 5% 5% 4 4 5% 5% 35%	2615
	21st to end	Night	17% 11% 3 8% 4 3 3 3 5% 6% 37%	2800
December	1st to 10th	Night	9% 8% 3 7% 4 4 5% 4 5% 6% 43%	4580
	11th to 20th	Night	15% 17% 5% 10% 5% 4 5% 3 4 5% 27%	5199
	21st to end	Night	19% 20% 6% 11% 5% 5% 4 3 4 4 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	59% 3 11% 19% 7%	3618
	11th to 20th	Day	51% 4 11% 12% 20% 1	3620
	21st to end	Day	52% 3 13% 19% 12%	4194
February	1st to 10th	Day	53% 4 12% 18% 11% 1	1800
	11th to 20th	Day	49% 5% 11% 22% 10% 2	1885
	21st to end	Day	52% 6% 9% 20% 11% 2	1650
March	1st to 10th	Day	39% 4 12% 29% 12% 4	4480
	11th to 20th	Day	39% 5% 12% 29% 14% 1	4832
	21st to end	Day	58% 4 11% 15% 10% 2	5891
April	1st to 10th	Day	53% 6% 10% 20% 11%	2400
	11th to 20th	Day	50% 5% 10% 20% 12% 2	2374
	21st to end	Day	52% 6% 11% 19% 12% 2	2460
May	1st to 10th	Day	42% 5% 9% 25% 18% 1	6118
	11th to 20th	Day	41% 6% 10% 28% 15% 1	6323
	21st to end	Day	41% 6% 11% 27% 13% 2	6949
June	1st to 10th	Day	36% 7% 15% 26% 15% 1	2800
	11th to 20th	Day	37% 7% 14% 24% 16% 1	2800
	21st to end	Day	39% 8% 14% 24% 14% 1	2800
July	1st to 10th	Day	41% 3 14% 32% 9% 1	6291
	11th to 20th	Day	35% 4 14% 32% 14% 1	6285
	21st to end	Day	41% 4 15% 23% 16% 1	6728
August	1st to 10th	Day	38% 6% 14% 29% 13% 1	4461
	11th to 20th	Day	36% 3 15% 33% 12% 1	3985
	21st to end	Day	35% 4 14% 30% 16% 1	4311
September	1st to 10th	Day	37% 8% 11% 25% 18% 2	2316
	11th to 20th	Day	32% 6% 12% 32% 16% 2	2223
	21st to end	Day	40% 5% 10% 29% 15% 1	2090
October	1st to 10th	Day	24% 3 6% 40% 26% 1	3206
	11th to 20th	Day	37% 3 8% 28% 23% 2	3140
	21st to end	Day	43% 3 10% 29% 13% 2	3144
November	1st to 10th	Day	40% 6% 14% 25% 13% 2	1762
	11th to 20th	Day	51% 5% 13% 20% 10% 1	1782
	21st to end	Day	51% 4 15% 23% 7%	1600
December	1st to 10th	Day	44% 3 21% 25% 6% 1	2610
	11th to 20th	Day	59% 3 11% 18% 7% 2	3005
	21st to end	Day	73% 4 7% 9% 6%	3982
January	1st to 10th	Night	52% 4 9% 22% 11% 1	6348
	11th to 20th	Night	58% 4 9% 11% 17% 1	6360
	21st to end	Night	56% 3 11% 18% 11%	6770
February	1st to 10th	Night	52% 4 11% 19% 12% 2	2600
	11th to 20th	Night	47% 4 10% 23% 14% 1	2412
	21st to end	Night	50% 4 12% 20% 12% 3	1980
March	1st to 10th	Night	45% 4 11% 23% 10% 7%	5373
	11th to 20th	Night	34% 4 12% 33% 14% 3	5171
	21st to end	Night	61% 4 8% 16% 11% 1	5039
April	1st to 10th	Night	46% 6% 11% 22% 14% 1	2000
	11th to 20th	Night	48% 4 7% 21% 17% 3	1975
	21st to end	Night	43% 7% 12% 24% 12% 2	1940
May	1st to 10th	Night	43% 6% 12% 18% 21% 1	3845
	11th to 20th	Night	36% 6% 15% 23% 18% 2	3597
	21st to end	Night	42% 7% 10% 24% 15% 2	3950
June	1st to 10th	Night	31% 8% 14% 28% 19% 1	1600
	11th to 20th	Night	35% 6% 11% 24% 22% 2	1600
	21st to end	Night	34% 7% 15% 23% 19% 3	1600
July	1st to 10th	Night	39% 3 14% 29% 13% 2	3580
	11th to 20th	Night	31% 3 13% 32% 19% 2	3572
	21st to end	Night	33% 5% 16% 24% 20% 3	3832
August	1st to 10th	Night	33% 5% 15% 26% 20% 1	2671
	11th to 20th	Night	34% 4 14% 32% 16% 1	3133
	21st to end	Night	34% 4 12% 28% 19% 3	3586
September	1st to 10th	Night	28% 6% 12% 28% 23% 2	1930
	11th to 20th	Night	32% 5% 11% 33% 18% 2	1938
	21st to end	Night	33% 5% 11% 30% 21% 1	2090
October	1st to 10th	Night	25% 3 6% 38% 27% 1	3752
	11th to 20th	Night	33% 3 10% 28% 23% 2	3779
	21st to end	Night	43% 3 10% 27% 15% 2	4404
November	1st to 10th	Night	39% 6% 11% 26% 16% 2	2536
	11th to 20th	Night	50% 6% 12% 19% 11% 2	2615
	21st to end	Night	49% 5% 14% 22% 10% 1	2800
December	1st to 10th	Night	41% 4 17% 28% 9% 1	4580
	11th to 20th	Night	61% 4 10% 15% 10% 1	5201
	21st to end	Night	70% 4 7% 13% 5%	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	17% 15% 34% 23% 9% 1	300
	11th to 20th	Day	16% 20% 38% 18% 6% 1	300
	21st to end	Day	23% 13% 35% 22% 5%	330
February	1st to 10th	Day	15% 20% 42% 17% 5%	300
	11th to 20th	Day	22% 19% 36% 18% 4	300
	21st to end	Day	22% 19% 43% 14% 2	249
March	1st to 10th	Day	19% 18% 44% 14% 5%	300
	11th to 20th	Day	21% 18% 37% 18% 5% 2	300
	21st to end	Day	29% 13% 31% 19% 6% 2	511
April	1st to 10th	Day	25% 16% 35% 21% 4	500
	11th to 20th	Day	24% 20% 25% 18% 11% 2	492
	21st to end	Day	24% 14% 29% 21% 10% 2	500
May	1st to 10th	Day	21% 10% 33% 27% 8% 2	594
	11th to 20th	Day	20% 12% 28% 25% 11% 4	725
	21st to end	Day	16% 10% 29% 24% 16% 5%	789
June	1st to 10th	Day	10% 9% 29% 30% 17% 5%	730
	11th to 20th	Day	15% 6% 32% 29% 14% 5%	730
	21st to end	Day	13% 8% 30% 29% 15% 5%	730
July	1st to 10th	Day	9% 5% 19% 31% 25% 12%	721
	11th to 20th	Day	11% 5% 25% 30% 19% 10%	718
	21st to end	Day	9% 3 25% 34% 23% 7%	794
August	1st to 10th	Day	9% 3 19% 34% 23% 12%	726
	11th to 20th	Day	13% 4 18% 27% 24% 13%	581
	21st to end	Day	10% 6% 21% 30% 24% 9%	583
September	1st to 10th	Day	16% 6% 23% 27% 20% 8%	502
	11th to 20th	Day	13% 3 20% 30% 24% 10%	490
	21st to end	Day	15% 12% 25% 25% 18% 5%	490
October	1st to 10th	Day	16% 11% 28% 26% 16% 3	333
	11th to 20th	Day	22% 17% 33% 20% 7%	300
	21st to end	Day	25% 17% 31% 20% 5% 1	330
November	1st to 10th	Day	17% 15% 37% 23% 7% 2	300
	11th to 20th	Day	20% 17% 39% 14% 10%	300
	21st to end	Day	24% 13% 42% 16% 4	300
December	1st to 10th	Day	18% 18% 40% 16% 7% 1	300
	11th to 20th	Day	20% 14% 40% 18% 7% 1	300
	21st to end	Day	25% 20% 34% 18% 3	330
January	1st to 10th	Night	16% 17% 36% 24% 7% 1	1000
	11th to 20th	Night	19% 14% 38% 24% 5% 1	1000
	21st to end	Night	19% 13% 37% 25% 5%	1100
February	1st to 10th	Night	19% 12% 39% 24% 6%	1000
	11th to 20th	Night	16% 17% 38% 25% 4	856
	21st to end	Night	22% 14% 40% 20% 3	660
March	1st to 10th	Night	22% 12% 36% 23% 7% 1	800
	11th to 20th	Night	16% 13% 37% 28% 6%	687
	21st to end	Night	25% 9% 32% 27% 6% 1	660
April	1st to 10th	Night	20% 12% 39% 25% 4	600
	11th to 20th	Night	23% 13% 29% 27% 7%	593
	21st to end	Night	20% 9% 32% 30% 8% 1	600
May	1st to 10th	Night	19% 10% 33% 30% 8% 1	600
	11th to 20th	Night	18% 7% 30% 34% 10% 1	591
	21st to end	Night	15% 5% 26% 37% 15% 1	650
June	1st to 10th	Night	10% 5% 28% 43% 15%	600
	11th to 20th	Night	15% 5% 29% 38% 13%	600
	21st to end	Night	12% 4 26% 40% 17% 1	600
July	1st to 10th	Night	10% 2 13% 39% 32% 4	585
	11th to 20th	Night	9% 2 22% 42% 22% 3	582
	21st to end	Night	7% 1 19% 48% 22% 2	657
August	1st to 10th	Night	6% 3 15% 48% 26% 3	597
	11th to 20th	Night	11% 2 13% 41% 28% 5%	594
	21st to end	Night	12% 2 17% 43% 23% 3	660
September	1st to 10th	Night	9% 3 26% 34% 22% 6%	579
	11th to 20th	Night	13% 3 22% 35% 24% 3	608
	21st to end	Night	12% 8% 24% 34% 19% 2	760
October	1st to 10th	Night	14% 8% 28% 33% 16% 1	760
	11th to 20th	Night	19% 13% 32% 27% 9%	760
	21st to end	Night	21% 12% 33% 27% 6% 1	836
November	1st to 10th	Night	16% 12% 38% 25% 9% 1	780
	11th to 20th	Night	20% 14% 39% 21% 6%	815
	21st to end	Night	22% 14% 34% 22% 7%	1000
December	1st to 10th	Night	21% 13% 38% 21% 6% 1	1000
	11th to 20th	Night	24% 12% 34% 23% 6% 1	1000
	21st to end	Night	28% 14% 33% 22% 3	1100

Page generated at 2025-09-01 00:51:05. Version ac07

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