Kenosha
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Kenosha clear sky chart from 2005-11-06 to 2025-03-12.

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 7% 5% 5% 5% 4 6% 7% 38%	108700
	Night	14% 9% 3 8% 5% 4 4 4 5% 6% 37%	110506
Transparency	Day	44% 5% 14% 24% 13% 2	112258
	Night	47% 3 13% 22% 13% 2	115076
Seeing	Day	15% 7% 25% 30% 18% 5%	16237
	Night	18% 8% 27% 29% 16% 3	26274

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	11% 11% 6% 12% 5% 6% 5% 4 6% 6% 27%	3617
	11th to 20th	Day	9% 10% 6% 10% 5% 5% 5% 8% 7% 6% 29%	3620
	21st to end	Day	14% 16% 6% 7% 4 3 4 2 5% 6% 32%	4002
February	1st to 10th	Day	13% 13% 5% 9% 6% 6% 4 5% 7% 7% 27%	1837
	11th to 20th	Day	13% 11% 4 8% 5% 5% 5% 4 5% 6% 34%	1948
	21st to end	Day	11% 12% 4 10% 6% 6% 5% 3 6% 6% 30%	1650
March	1st to 10th	Day	13% 10% 3 7% 4 5% 4 3 5% 6% 39%	3220
	11th to 20th	Day	11% 6% 3 7% 6% 6% 6% 4 6% 8% 40%	3259
	21st to end	Day	18% 12% 5% 10% 6% 5% 5% 4 5% 5% 25%	4165
April	1st to 10th	Day	16% 11% 3 8% 5% 5% 5% 4 6% 6% 32%	2280
	11th to 20th	Day	15% 8% 3 7% 5% 5% 5% 4 6% 7% 36%	2254
	21st to end	Day	17% 9% 2 7% 5% 5% 5% 3 5% 7% 34%	2413
May	1st to 10th	Day	15% 8% 3 8% 5% 5% 5% 4 6% 7% 35%	4082
	11th to 20th	Day	14% 6% 2 6% 5% 5% 5% 4 6% 8% 40%	4324
	21st to end	Day	11% 6% 2 6% 4 5% 4 4 7% 8% 44%	4824
June	1st to 10th	Day	9% 6% 3 6% 5% 4 5% 4 6% 8% 44%	2660
	11th to 20th	Day	11% 5% 2 5% 4 4 4 4 6% 9% 45%	2660
	21st to end	Day	9% 6% 3 7% 5% 5% 5% 4 7% 8% 42%	2660
July	1st to 10th	Day	11% 6% 3 7% 4 5% 5% 5% 7% 10% 37%	4440
	11th to 20th	Day	5% 4 1 4 4 4 4 4 7% 10% 52%	4440
	21st to end	Day	7% 6% 2 6% 5% 5% 6% 4 6% 8% 46%	4813
August	1st to 10th	Day	10% 5% 2 6% 4 4 4 4 7% 9% 45%	4341
	11th to 20th	Day	9% 5% 2 5% 4 4 4 3 6% 9% 50%	3822
	21st to end	Day	6% 5% 2 7% 5% 4 4 4 6% 8% 48%	4180
September	1st to 10th	Day	12% 5% 2 5% 3 4 4 4 7% 7% 48%	2280
	11th to 20th	Day	12% 4 1 4 3 3 4 3 5% 8% 53%	2150
	21st to end	Day	11% 5% 3 7% 5% 4 4 4 7% 9% 41%	2090
October	1st to 10th	Day	13% 6% 2 7% 4 4 3 3 4 8% 46%	2049
	11th to 20th	Day	17% 8% 3 8% 5% 4 4 3 6% 7% 34%	1862
	21st to end	Day	19% 8% 3 7% 4 5% 4 4 4 6% 36%	1881
November	1st to 10th	Day	11% 9% 3 7% 5% 4 3 3 6% 7% 42%	1762
	11th to 20th	Day	14% 11% 3 9% 5% 5% 5% 4 6% 8% 30%	1800
	21st to end	Day	19% 11% 3 8% 4 4 4 3 4 5% 35%	1715
December	1st to 10th	Day	9% 9% 3 7% 5% 6% 5% 4 7% 7% 36%	2610
	11th to 20th	Day	12% 14% 5% 11% 6% 6% 6% 5% 6% 7% 23%	3008
	21st to end	Day	21% 21% 8% 11% 6% 4 4 3 3 4 14%	3982
January	1st to 10th	Night	12% 11% 6% 11% 6% 4 4 3 5% 5% 31%	6348
	11th to 20th	Night	13% 14% 5% 12% 6% 6% 6% 6% 6% 4 22%	6360
	21st to end	Night	16% 14% 6% 9% 4 3 3 3 5% 6% 31%	6973
February	1st to 10th	Night	14% 14% 4 8% 5% 5% 4 4 5% 6% 31%	2561
	11th to 20th	Night	13% 11% 3 8% 5% 4 5% 3 5% 6% 37%	2338
	21st to end	Night	18% 11% 3 7% 5% 4 4 2 4 5% 36%	1980
March	1st to 10th	Night	16% 10% 3 7% 4 4 3 3 5% 5% 40%	3853
	11th to 20th	Night	9% 6% 2 6% 4 4 4 4 6% 8% 46%	3755
	21st to end	Night	21% 11% 5% 10% 5% 5% 4 4 4 4 28%	3466
April	1st to 10th	Night	16% 8% 2 6% 5% 5% 4 4 5% 6% 38%	1900
	11th to 20th	Night	19% 8% 2 7% 5% 4 4 3 3 5% 38%	1875
	21st to end	Night	19% 7% 2 6% 4 4 4 3 5% 6% 39%	1766
May	1st to 10th	Night	15% 7% 3 7% 5% 5% 5% 4 6% 9% 35%	2813
	11th to 20th	Night	17% 7% 2 5% 4 5% 5% 4 7% 9% 35%	2577
	21st to end	Night	12% 6% 3 7% 5% 5% 4 3 5% 6% 43%	2743
June	1st to 10th	Night	8% 6% 2 6% 4 4 4 4 6% 9% 46%	1520
	11th to 20th	Night	11% 5% 2 6% 4 4 4 4 6% 9% 44%	1520
	21st to end	Night	9% 6% 2 8% 5% 5% 5% 3 7% 8% 43%	1520
July	1st to 10th	Night	12% 6% 2 7% 6% 5% 5% 5% 6% 7% 39%	2530
	11th to 20th	Night	5% 4 1 4 4 3 5% 4 7% 10% 53%	2530
	21st to end	Night	6% 4 2 5% 5% 5% 5% 5% 8% 8% 47%	2750
August	1st to 10th	Night	10% 4 2 5% 3 3 4 4 6% 8% 51%	2595
	11th to 20th	Night	9% 4 2 5% 3 4 4 3 5% 8% 52%	3003
	21st to end	Night	8% 4 1 5% 4 4 4 4 5% 9% 51%	3476
September	1st to 10th	Night	9% 5% 2 5% 3 3 4 3 6% 7% 52%	1900
	11th to 20th	Night	11% 3 2 5% 3 3 3 3 5% 7% 55%	2009
	21st to end	Night	13% 6% 2 6% 4 5% 3 3 5% 7% 45%	2090
October	1st to 10th	Night	13% 5% 2 6% 4 4 4 4 4 6% 49%	2128
	11th to 20th	Night	17% 8% 3 6% 4 3 4 3 5% 6% 42%	2318
	21st to end	Night	21% 7% 2 7% 4 4 4 3 4 8% 36%	2717
November	1st to 10th	Night	13% 7% 3 6% 5% 4 3 3 5% 7% 45%	2536
	11th to 20th	Night	14% 12% 4 8% 4 4 4 4 5% 7% 35%	2600
	21st to end	Night	16% 10% 4 8% 5% 5% 5% 3 5% 6% 34%	2681
December	1st to 10th	Night	11% 11% 3 8% 5% 5% 5% 4 4 6% 39%	4580
	11th to 20th	Night	17% 14% 4 9% 6% 5% 4 4 5% 6% 26%	5199
	21st to end	Night	23% 18% 5% 10% 5% 5% 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	58% 4 18% 16% 5%	3618
	11th to 20th	Day	52% 3 23% 12% 9% 1	3620
	21st to end	Day	54% 3 12% 20% 10%	4002
February	1st to 10th	Day	55% 5% 13% 18% 7% 1	1837
	11th to 20th	Day	50% 4 11% 24% 9% 1	1958
	21st to end	Day	55% 4 11% 18% 10% 2	1650
March	1st to 10th	Day	47% 3 13% 23% 11% 3	3220
	11th to 20th	Day	42% 5% 13% 27% 11% 1	3259
	21st to end	Day	61% 4 14% 15% 5%	4165
April	1st to 10th	Day	52% 6% 10% 21% 11%	2280
	11th to 20th	Day	47% 5% 10% 22% 13% 4	2254
	21st to end	Day	48% 6% 12% 19% 12% 2	2413
May	1st to 10th	Day	46% 6% 11% 22% 13% 2	4120
	11th to 20th	Day	40% 5% 13% 25% 15% 1	4328
	21st to end	Day	36% 5% 14% 23% 18% 4	4837
June	1st to 10th	Day	37% 4 14% 25% 18% 3	2660
	11th to 20th	Day	34% 6% 14% 24% 20% 3	2660
	21st to end	Day	38% 7% 13% 24% 15% 2	2660
July	1st to 10th	Day	41% 6% 13% 24% 13% 3	4371
	11th to 20th	Day	26% 6% 17% 33% 17% 1	4365
	21st to end	Day	34% 6% 17% 20% 19% 3	4662
August	1st to 10th	Day	34% 5% 16% 29% 14% 1	4326
	11th to 20th	Day	31% 5% 13% 36% 14% 1	3861
	21st to end	Day	33% 6% 13% 26% 21% 2	4179
September	1st to 10th	Day	34% 5% 13% 28% 17% 2	2280
	11th to 20th	Day	31% 5% 13% 32% 17% 2	2150
	21st to end	Day	38% 6% 12% 28% 16% 1	2090
October	1st to 10th	Day	26% 3 8% 41% 21% 1	3400
	11th to 20th	Day	38% 3 13% 27% 18% 1	3078
	21st to end	Day	44% 3 10% 28% 12% 3	3081
November	1st to 10th	Day	42% 4 15% 22% 15% 1	1762
	11th to 20th	Day	53% 4 15% 19% 7% 1	1800
	21st to end	Day	53% 3 14% 22% 7%	1715
December	1st to 10th	Day	47% 4 23% 20% 5%	2610
	11th to 20th	Day	60% 4 14% 16% 6%	3005
	21st to end	Day	75% 2 8% 11% 3	3982
January	1st to 10th	Night	57% 1 14% 20% 7%	6348
	11th to 20th	Night	64% 2 16% 9% 8%	6360
	21st to end	Night	56% 2 18% 16% 8%	6973
February	1st to 10th	Night	56% 3 12% 18% 10% 1	2561
	11th to 20th	Night	49% 3 12% 23% 12% 1	2339
	21st to end	Night	52% 2 12% 21% 11% 3	1980
March	1st to 10th	Night	48% 2 13% 25% 9% 3	3853
	11th to 20th	Night	36% 3 13% 28% 18% 2	3755
	21st to end	Night	61% 2 9% 18% 9% 1	3466
April	1st to 10th	Night	46% 5% 12% 22% 14% 1	1900
	11th to 20th	Night	49% 4 6% 19% 18% 4	1875
	21st to end	Night	46% 4 12% 20% 16% 2	1766
May	1st to 10th	Night	46% 4 12% 20% 15% 3	2840
	11th to 20th	Night	44% 5% 14% 25% 11% 1	2578
	21st to end	Night	42% 4 11% 18% 18% 7%	2751
June	1st to 10th	Night	34% 5% 13% 28% 18% 3	1520
	11th to 20th	Night	37% 5% 9% 26% 22% 2	1520
	21st to end	Night	38% 6% 15% 23% 15% 2	1520
July	1st to 10th	Night	43% 5% 14% 21% 12% 6%	2490
	11th to 20th	Night	25% 5% 15% 35% 16% 3	2482
	21st to end	Night	32% 6% 15% 20% 24% 3	2662
August	1st to 10th	Night	31% 5% 15% 29% 19% 2	2586
	11th to 20th	Night	31% 5% 11% 34% 18% 1	3030
	21st to end	Night	30% 5% 12% 30% 19% 3	3476
September	1st to 10th	Night	32% 5% 12% 27% 22% 2	1900
	11th to 20th	Night	29% 4 9% 35% 20% 2	2009
	21st to end	Night	40% 3 9% 30% 16% 1	2090
October	1st to 10th	Night	25% 3 8% 38% 25% 1	3544
	11th to 20th	Night	39% 2 12% 22% 23% 2	3841
	21st to end	Night	42% 4 11% 25% 17% 2	4467
November	1st to 10th	Night	41% 3 12% 25% 16% 3	2536
	11th to 20th	Night	51% 3 14% 21% 10% 2	2600
	21st to end	Night	52% 3 15% 23% 7%	2681
December	1st to 10th	Night	48% 3 17% 23% 6% 2	4580
	11th to 20th	Night	60% 3 14% 15% 7% 1	5201
	21st to end	Night	71% 2 10% 12% 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	19% 11% 34% 27% 8% 1	300
	11th to 20th	Day	18% 14% 37% 23% 7% 1	300
	21st to end	Day	20% 8% 37% 26% 7% 1	330
February	1st to 10th	Day	14% 16% 41% 23% 6%	300
	11th to 20th	Day	18% 17% 33% 24% 7% 1	300
	21st to end	Day	16% 16% 43% 20% 5%	249
March	1st to 10th	Day	17% 11% 42% 24% 5%	300
	11th to 20th	Day	19% 14% 34% 24% 8% 1	309
	21st to end	Day	23% 11% 31% 25% 9% 1	506
April	1st to 10th	Day	20% 12% 31% 30% 7%	460
	11th to 20th	Day	18% 12% 36% 21% 9% 4	452
	21st to end	Day	20% 10% 32% 23% 13% 2	460
May	1st to 10th	Day	20% 4 31% 32% 11% 2	463
	11th to 20th	Day	18% 4 25% 35% 15% 3	626
	21st to end	Day	14% 3 25% 30% 21% 8%	734
June	1st to 10th	Day	10% 4 21% 38% 23% 5%	680
	11th to 20th	Day	14% 3 16% 40% 23% 5%	680
	21st to end	Day	11% 3 19% 39% 24% 4	680
July	1st to 10th	Day	7% 3 11% 33% 34% 12%	671
	11th to 20th	Day	10% 1 17% 36% 28% 8%	668
	21st to end	Day	7% 1 15% 43% 28% 7%	739
August	1st to 10th	Day	7% 3 11% 37% 33% 9%	633
	11th to 20th	Day	9% 3 13% 33% 32% 11%	479
	21st to end	Day	9% 2 14% 34% 31% 10%	539
September	1st to 10th	Day	12% 5% 18% 31% 24% 10%	490
	11th to 20th	Day	9% 2 14% 31% 30% 13%	490
	21st to end	Day	15% 6% 23% 27% 19% 11%	490
October	1st to 10th	Day	16% 6% 24% 27% 20% 6%	449
	11th to 20th	Day	22% 12% 28% 23% 12% 3	300
	21st to end	Day	26% 10% 27% 28% 8% 1	330
November	1st to 10th	Day	13% 10% 33% 27% 14% 2	300
	11th to 20th	Day	19% 16% 36% 18% 10%	300
	21st to end	Day	25% 6% 37% 26% 5%	300
December	1st to 10th	Day	17% 16% 36% 20% 10% 1	300
	11th to 20th	Day	19% 14% 36% 22% 8%	300
	21st to end	Day	27% 14% 35% 20% 4 1	330
January	1st to 10th	Night	20% 14% 38% 24% 5%	1000
	11th to 20th	Night	22% 13% 36% 22% 6% 1	1000
	21st to end	Night	21% 10% 38% 26% 6%	1100
February	1st to 10th	Night	21% 10% 38% 25% 6%	961
	11th to 20th	Night	20% 13% 36% 25% 5%	783
	21st to end	Night	26% 9% 36% 24% 4 1	660
March	1st to 10th	Night	19% 9% 35% 28% 9% 1	800
	11th to 20th	Night	14% 9% 35% 32% 10% 1	767
	21st to end	Night	24% 5% 29% 29% 11% 1	627
April	1st to 10th	Night	20% 8% 31% 31% 9%	570
	11th to 20th	Night	23% 7% 28% 28% 13% 2	563
	21st to end	Night	24% 6% 22% 33% 16% 1	570
May	1st to 10th	Night	19% 4 23% 38% 14% 2	570
	11th to 20th	Night	20% 2 20% 31% 24% 2	561
	21st to end	Night	14% 3 16% 33% 29% 6%	617
June	1st to 10th	Night	10% 3 14% 42% 27% 4	570
	11th to 20th	Night	13% 3 17% 38% 26% 3	570
	21st to end	Night	10% 3 16% 39% 29% 3	570
July	1st to 10th	Night	8% 2 8% 35% 36% 11%	555
	11th to 20th	Night	8% 3 10% 38% 32% 9%	552
	21st to end	Night	7% 1 10% 40% 37% 4	624
August	1st to 10th	Night	8% 1 9% 38% 36% 8%	567
	11th to 20th	Night	9% 2 12% 32% 36% 10%	564
	21st to end	Night	8% 2 12% 34% 36% 7%	627
September	1st to 10th	Night	12% 3 14% 33% 29% 9%	570
	11th to 20th	Night	11% 4 14% 28% 31% 11%	679
	21st to end	Night	16% 6% 20% 26% 23% 9%	760
October	1st to 10th	Night	16% 5% 23% 30% 23% 4	760
	11th to 20th	Night	20% 10% 31% 26% 12% 1	760
	21st to end	Night	25% 9% 28% 26% 10% 1	836
November	1st to 10th	Night	17% 10% 35% 25% 12% 1	780
	11th to 20th	Night	22% 17% 33% 21% 7% 1	800
	21st to end	Night	23% 12% 35% 23% 7%	881
December	1st to 10th	Night	22% 15% 36% 22% 5%	1000
	11th to 20th	Night	24% 11% 37% 23% 5%	1000
	21st to end	Night	32% 12% 34% 20% 3	1100

Page generated at 2025-03-09 07:08:49. Version ac07

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