Kenosha Pass
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Kenosha Pass clear sky chart from 2005-11-06 to 2025-11-18.

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	3 6% 3 8% 5% 5% 5% 4 6% 7% 46%	135657
	Night	2 4 2 6% 4 4 4 4 6% 8% 57%	132173
Transparency	Day	32% 4 10% 24% 22% 8%	130590
	Night	24% 4 12% 28% 25% 7%	128244
Seeing	Day	14% 19% 27% 24% 13% 3	16950
	Night	6% 15% 33% 31% 13% 2	26974

By Month

Percentage Cloud Cover SW (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	1 3 11% 5% 4 5% 2 5% 7% 56%	3638
	11th to 20th	Day	2 2 9% 6% 7% 7% 5% 5% 7% 50%	3898
	21st to end	Day	3 4 9% 4 5% 4 4 5% 5% 57%	4510
February	1st to 10th	Day	3 4 9% 6% 4 4 3 7% 8% 52%	1800
	11th to 20th	Day	3 2 6% 5% 5% 5% 4 5% 8% 57%	1890
	21st to end	Day	3 3 9% 6% 5% 5% 5% 5% 6% 52%	1650
March	1st to 10th	Day	4 5% 9% 5% 5% 4 3 4 5% 54%	4564
	11th to 20th	Day	1 8% 6% 11% 6% 6% 5% 4 6% 8% 40%	5000
	21st to end	Day	1 7% 4 9% 7% 6% 6% 4 6% 7% 43%	5744
April	1st to 10th	Day	2 7% 3 7% 5% 5% 5% 4 5% 7% 49%	2400
	11th to 20th	Day	3 12% 4 10% 6% 6% 5% 3 5% 7% 39%	2371
	21st to end	Day	3 12% 4 8% 6% 5% 5% 4 6% 7% 38%	2400
May	1st to 10th	Day	3 15% 5% 12% 6% 6% 6% 4 6% 6% 31%	5675
	11th to 20th	Day	4 9% 3 8% 6% 6% 5% 5% 7% 7% 40%	6298
	21st to end	Day	4 7% 3 7% 5% 5% 6% 5% 7% 8% 44%	6925
June	1st to 10th	Day	5% 7% 3 7% 5% 6% 6% 6% 6% 8% 42%	2800
	11th to 20th	Day	6% 6% 2 5% 4 5% 5% 4 6% 7% 48%	2800
	21st to end	Day	5% 6% 2 6% 6% 5% 6% 6% 7% 8% 44%	2800
July	1st to 10th	Day	4 5% 2 7% 5% 6% 6% 5% 7% 7% 46%	6339
	11th to 20th	Day	4 5% 2 8% 7% 7% 8% 7% 9% 9% 33%	6340
	21st to end	Day	7% 7% 4 10% 8% 7% 6% 5% 6% 7% 33%	6592
August	1st to 10th	Day	7% 6% 3 8% 6% 7% 7% 6% 9% 11% 31%	5779
	11th to 20th	Day	5% 6% 3 8% 6% 6% 8% 6% 7% 7% 38%	5434
	21st to end	Day	7% 8% 3 9% 7% 7% 7% 5% 7% 8% 32%	5984
September	1st to 10th	Day	7% 7% 2 7% 5% 4 5% 4 5% 6% 48%	2400
	11th to 20th	Day	7% 5% 2 7% 5% 5% 5% 3 5% 5% 50%	2400
	21st to end	Day	5% 7% 2 6% 4 4 3 3 4 7% 55%	2173
October	1st to 10th	Day	3 4 1 4 4 3 3 2 4 4 67%	3270
	11th to 20th	Day	3 6% 2 6% 5% 5% 5% 4 7% 7% 51%	3250
	21st to end	Day	2 5% 2 5% 3 3 2 3 4 6% 64%	3502
November	1st to 10th	Day	1 4 2 3 3 2 3 3 5% 7% 67%	1853
	11th to 20th	Day	3 2 4 2 2 3 3 5% 8% 67%	1863
	21st to end	Day	4 4 5% 3 3 3 3 6% 9% 60%	1665
December	1st to 10th	Day	2 1 4 3 3 4 3 5% 7% 67%	2620
	11th to 20th	Day	2 2 5% 4 3 3 3 4 10% 64%	3026
	21st to end	Day	4 2 9% 4 4 3 3 5% 9% 55%	4004
January	1st to 10th	Night	1 2 10% 6% 5% 4 3 5% 7% 56%	6327
	11th to 20th	Night	1 1 7% 6% 6% 5% 4 4 5% 60%	6112
	21st to end	Night	3 3 6% 4 4 4 3 5% 6% 63%	6468
February	1st to 10th	Night	2 2 6% 4 4 4 3 5% 8% 62%	2600
	11th to 20th	Night	3 2 6% 4 3 4 4 6% 7% 61%	2396
	21st to end	Night	4 3 6% 3 4 3 3 5% 8% 61%	1980
March	1st to 10th	Night	5% 3 7% 5% 4 4 4 5% 7% 56%	5297
	11th to 20th	Night	1 7% 4 8% 4 4 3 3 5% 7% 54%	5000
	21st to end	Night	1 5% 3 6% 4 4 5% 4 6% 8% 53%	5219
April	1st to 10th	Night	1 4 2 5% 4 4 4 4 6% 8% 59%	2000
	11th to 20th	Night	2 10% 3 7% 4 3 4 4 6% 6% 52%	1977
	21st to end	Night	3 10% 2 6% 4 4 3 3 5% 8% 52%	2000
May	1st to 10th	Night	2 10% 4 8% 5% 5% 5% 4 7% 8% 42%	4301
	11th to 20th	Night	3 7% 3 7% 5% 4 5% 4 6% 8% 48%	3617
	21st to end	Night	4 7% 2 5% 4 4 4 3 6% 7% 56%	3972
June	1st to 10th	Night	3 5% 1 4 3 3 5% 4 7% 10% 56%	1600
	11th to 20th	Night	4 3 1 3 3 3 3 3 5% 8% 63%	1600
	21st to end	Night	4 4 1 4 4 3 4 4 6% 9% 57%	1600
July	1st to 10th	Night	3 5% 2 5% 4 4 5% 5% 6% 7% 55%	3640
	11th to 20th	Night	2 3 1 5% 4 5% 6% 6% 9% 12% 48%	3640
	21st to end	Night	3 4 2 6% 5% 5% 5% 5% 8% 9% 47%	4278
August	1st to 10th	Night	5% 5% 2 5% 3 4 5% 4 7% 11% 48%	4033
	11th to 20th	Night	3 3 1 4 4 4 5% 5% 8% 9% 53%	4415
	21st to end	Night	6% 7% 2 7% 5% 5% 6% 5% 8% 9% 39%	4993
September	1st to 10th	Night	4 5% 1 4 4 4 5% 4 6% 8% 55%	2000
	11th to 20th	Night	4 4 2 5% 4 3 4 4 4 6% 58%	2000
	21st to end	Night	5% 5% 1 4 3 3 4 3 5% 7% 61%	2223
October	1st to 10th	Night	3 3 1 3 2 2 3 2 3 5% 72%	3920
	11th to 20th	Night	1 4 2 6% 3 4 3 3 5% 7% 63%	3898
	21st to end	Night	1 4 1 3 2 2 3 3 4 6% 72%	4252
November	1st to 10th	Night	1 3 1 3 2 2 3 3 5% 7% 70%	2665
	11th to 20th	Night	3 1 3 3 3 3 3 5% 8% 69%	2692
	21st to end	Night	1 5% 2 5% 3 3 4 4 6% 8% 61%	2733
December	1st to 10th	Night	2 1 3 2 2 2 2 3 6% 77%	4570
	11th to 20th	Night	2 1 3 2 4 4 4 6% 8% 67%	5181
	21st to end	Night	3 2 8% 5% 4 5% 4 6% 8% 54%	6974

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	25% 2 11% 31% 22% 8%	3639
	11th to 20th	Day	27% 3 12% 23% 28% 7%	3898
	21st to end	Day	26% 2 8% 28% 23% 12%	4510
February	1st to 10th	Day	25% 4 17% 28% 19% 8%	1800
	11th to 20th	Day	23% 3 11% 29% 27% 7%	1900
	21st to end	Day	28% 3 10% 22% 26% 11%	1650
March	1st to 10th	Day	28% 3 5% 20% 30% 13%	4564
	11th to 20th	Day	39% 3 6% 31% 18% 4	5000
	21st to end	Day	34% 2 12% 35% 15% 2	5744
April	1st to 10th	Day	30% 4 13% 25% 21% 8%	2400
	11th to 20th	Day	41% 3 11% 21% 20% 5%	2374
	21st to end	Day	41% 3 9% 30% 16% 2	2400
May	1st to 10th	Day	46% 5% 9% 18% 18% 4	5675
	11th to 20th	Day	39% 4 7% 25% 20% 5%	6302
	21st to end	Day	34% 6% 7% 23% 27% 4	6926
June	1st to 10th	Day	36% 5% 11% 21% 20% 6%	2800
	11th to 20th	Day	32% 4 7% 20% 23% 14%	2800
	21st to end	Day	33% 6% 9% 20% 21% 11%	2800
July	1st to 10th	Day	30% 7% 6% 14% 17% 25%	6271
	11th to 20th	Day	38% 8% 14% 21% 13% 7%	6265
	21st to end	Day	44% 6% 13% 13% 14% 9%	6403
August	1st to 10th	Day	47% 7% 16% 14% 12% 4	4208
	11th to 20th	Day	41% 7% 10% 14% 20% 8%	3926
	21st to end	Day	39% 6% 11% 17% 20% 7%	4311
September	1st to 10th	Day	35% 4 9% 17% 23% 13%	2400
	11th to 20th	Day	33% 3 9% 19% 26% 9%	2400
	21st to end	Day	28% 2 6% 25% 31% 8%	2173
October	1st to 10th	Day	19% 4 4 20% 37% 14%	3270
	11th to 20th	Day	27% 6% 8% 30% 24% 5%	3250
	21st to end	Day	20% 2 6% 33% 32% 6%	3502
November	1st to 10th	Day	17% 2 12% 25% 35% 9%	1853
	11th to 20th	Day	15% 3 11% 36% 26% 10%	1863
	21st to end	Day	19% 3 11% 30% 25% 11%	1665
December	1st to 10th	Day	15% 4 10% 37% 25% 8%	2620
	11th to 20th	Day	17% 3 15% 35% 27% 4	3024
	21st to end	Day	24% 3 9% 27% 29% 8%	4004
January	1st to 10th	Night	26% 3 8% 31% 25% 7%	6327
	11th to 20th	Night	20% 4 10% 28% 25% 13%	6112
	21st to end	Night	22% 4 8% 28% 27% 11%	6468
February	1st to 10th	Night	21% 3 14% 32% 23% 7%	2600
	11th to 20th	Night	20% 4 12% 32% 27% 6%	2396
	21st to end	Night	21% 2 10% 28% 28% 11%	1980
March	1st to 10th	Night	24% 3 5% 23% 35% 9%	5297
	11th to 20th	Night	29% 3 6% 26% 30% 6%	5000
	21st to end	Night	27% 3 17% 38% 13% 1	5219
April	1st to 10th	Night	20% 5% 14% 32% 23% 5%	2000
	11th to 20th	Night	31% 3 11% 31% 21% 3	1977
	21st to end	Night	30% 4 14% 34% 18% 1	2000
May	1st to 10th	Night	34% 7% 13% 26% 15% 5%	4298
	11th to 20th	Night	33% 4 12% 28% 22% 1	3618
	21st to end	Night	29% 5% 11% 26% 27% 3	3972
June	1st to 10th	Night	23% 4 20% 29% 17% 7%	1600
	11th to 20th	Night	19% 4 14% 23% 26% 15%	1600
	21st to end	Night	23% 5% 14% 23% 24% 12%	1600
July	1st to 10th	Night	24% 6% 9% 20% 23% 18%	3600
	11th to 20th	Night	25% 6% 23% 27% 13% 6%	3592
	21st to end	Night	30% 6% 22% 23% 9% 11%	4155
August	1st to 10th	Night	34% 8% 23% 20% 13% 3	2928
	11th to 20th	Night	27% 6% 22% 19% 19% 6%	3199
	21st to end	Night	34% 7% 17% 21% 19% 3	3597
September	1st to 10th	Night	26% 5% 11% 26% 23% 9%	2000
	11th to 20th	Night	25% 5% 11% 26% 22% 12%	2000
	21st to end	Night	23% 3 9% 31% 27% 7%	2223
October	1st to 10th	Night	16% 4 7% 27% 35% 11%	3920
	11th to 20th	Night	20% 5% 11% 34% 24% 6%	3898
	21st to end	Night	15% 3 6% 31% 38% 8%	4252
November	1st to 10th	Night	14% 3 11% 29% 33% 10%	2665
	11th to 20th	Night	14% 3 11% 35% 29% 9%	2692
	21st to end	Night	19% 3 11% 31% 26% 10%	2733
December	1st to 10th	Night	12% 3 10% 37% 32% 6%	4570
	11th to 20th	Night	14% 3 11% 35% 33% 3	5182
	21st to end	Night	25% 4 12% 25% 27% 7%	6974

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% 24% 30% 19% 9% 2	300
	11th to 20th	Day	15% 31% 31% 18% 4 1	300
	21st to end	Day	12% 26% 36% 18% 6% 2	330
February	1st to 10th	Day	21% 35% 30% 12% 1 1	300
	11th to 20th	Day	20% 32% 32% 12% 3 1	300
	21st to end	Day	22% 33% 29% 14% 1	249
March	1st to 10th	Day	16% 27% 30% 20% 6%	325
	11th to 20th	Day	15% 27% 31% 19% 7%	500
	21st to end	Day	19% 34% 31% 13% 3 1	550
April	1st to 10th	Day	20% 30% 30% 16% 3 1	500
	11th to 20th	Day	27% 32% 27% 9% 4 1	492
	21st to end	Day	20% 31% 28% 16% 4 1	500
May	1st to 10th	Day	19% 27% 29% 18% 6% 2	568
	11th to 20th	Day	17% 17% 28% 24% 13% 2	725
	21st to end	Day	15% 17% 26% 23% 16% 2	789
June	1st to 10th	Day	10% 14% 26% 28% 18% 5%	730
	11th to 20th	Day	12% 14% 26% 29% 15% 3	730
	21st to end	Day	6% 14% 28% 29% 19% 4	730
July	1st to 10th	Day	9% 5% 20% 36% 25% 6%	721
	11th to 20th	Day	9% 4 17% 34% 28% 7%	718
	21st to end	Day	12% 8% 17% 31% 26% 7%	662
August	1st to 10th	Day	15% 8% 26% 31% 15% 6%	527
	11th to 20th	Day	9% 8% 24% 32% 19% 8%	517
	21st to end	Day	13% 9% 23% 31% 18% 6%	583
September	1st to 10th	Day	12% 9% 26% 29% 19% 5%	530
	11th to 20th	Day	9% 12% 29% 31% 15% 3	530
	21st to end	Day	10% 15% 24% 26% 17% 8%	340
October	1st to 10th	Day	12% 17% 25% 22% 16% 8%	330
	11th to 20th	Day	15% 23% 26% 23% 10% 3	330
	21st to end	Day	14% 21% 32% 24% 7% 1	363
November	1st to 10th	Day	16% 25% 31% 18% 9% 1	330
	11th to 20th	Day	15% 23% 31% 23% 7% 2	321
	21st to end	Day	10% 24% 41% 19% 6% 1	300
December	1st to 10th	Day	14% 29% 30% 18% 7% 2	300
	11th to 20th	Day	16% 31% 33% 14% 5% 1	300
	21st to end	Day	18% 28% 30% 17% 6% 2	330
January	1st to 10th	Night	6% 23% 37% 24% 9% 1	1000
	11th to 20th	Night	8% 26% 37% 19% 8% 1	902
	21st to end	Night	4 21% 44% 24% 7% 1	880
February	1st to 10th	Night	5% 24% 48% 18% 5%	800
	11th to 20th	Night	5% 25% 44% 20% 5%	784
	21st to end	Night	4 24% 47% 23% 2	660
March	1st to 10th	Night	5% 21% 43% 25% 6% 1	800
	11th to 20th	Night	4 17% 37% 33% 8% 1	800
	21st to end	Night	6% 16% 49% 24% 4	765
April	1st to 10th	Night	5% 20% 45% 27% 4	600
	11th to 20th	Night	8% 19% 39% 25% 8% 1	593
	21st to end	Night	9% 16% 34% 34% 7% 1	600
May	1st to 10th	Night	10% 10% 37% 32% 11% 1	600
	11th to 20th	Night	10% 11% 25% 41% 13% 1	591
	21st to end	Night	9% 11% 25% 37% 16% 2	650
June	1st to 10th	Night	5% 7% 23% 43% 21% 2	600
	11th to 20th	Night	6% 7% 29% 45% 12% 2	600
	21st to end	Night	5% 4 20% 45% 24% 3	600
July	1st to 10th	Night	6% 3 12% 42% 34% 3	585
	11th to 20th	Night	4 2 7% 44% 39% 4	582
	21st to end	Night	7% 2 8% 38% 41% 5%	657
August	1st to 10th	Night	7% 2 11% 43% 33% 3	597
	11th to 20th	Night	6% 2 10% 47% 30% 5%	594
	21st to end	Night	7% 5% 12% 42% 30% 5%	660
September	1st to 10th	Night	6% 3 13% 48% 25% 5%	600
	11th to 20th	Night	7% 3 21% 46% 21% 3	600
	21st to end	Night	7% 6% 27% 39% 17% 3	633
October	1st to 10th	Night	7% 8% 36% 32% 15% 2	800
	11th to 20th	Night	5% 13% 38% 31% 12% 2	800
	21st to end	Night	6% 13% 38% 32% 9% 2	880
November	1st to 10th	Night	4 17% 44% 26% 8% 1	1025
	11th to 20th	Night	6% 21% 42% 24% 5% 1	1036
	21st to end	Night	5% 18% 41% 29% 7%	1000
December	1st to 10th	Night	6% 22% 42% 24% 6% 1	1000
	11th to 20th	Night	5% 26% 40% 23% 6%	1000
	21st to end	Night	7% 26% 39% 21% 5% 1	1100

Page generated at 2025-11-14 22:55:56. Version ac07

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