Kansas City
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Kansas City 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	12% 7% 3 6% 4 4 4 3 5% 7% 45%	125735
	Night	12% 7% 3 6% 4 3 4 3 5% 6% 48%	123210
Transparency	Day	24% 38% 7% 17% 12% 2	129347
	Night	24% 37% 7% 17% 13% 2	127674
Seeing	Day	16% 12% 30% 27% 13% 3	16864
	Night	15% 10% 32% 31% 11% 1	26625

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	15% 10% 3 9% 4 4 4 3 4 6% 36%	4077
	11th to 20th	Day	8% 9% 4 10% 6% 8% 5% 3 4 4 40%	4080
	21st to end	Day	14% 14% 4 9% 5% 4 4 2 3 4 37%	4488
February	1st to 10th	Day	14% 13% 4 7% 6% 3 3 3 5% 7% 36%	1800
	11th to 20th	Day	13% 11% 4 7% 5% 4 4 3 5% 5% 41%	1754
	21st to end	Day	12% 9% 3 7% 4 3 4 3 5% 6% 45%	1698
March	1st to 10th	Day	14% 9% 3 6% 3 3 3 2 3 5% 51%	4936
	11th to 20th	Day	11% 6% 2 4 3 3 3 3 4 6% 55%	4980
	21st to end	Day	13% 11% 4 7% 5% 4 5% 3 5% 7% 34%	5462
April	1st to 10th	Day	15% 8% 2 6% 4 3 4 3 5% 6% 45%	2315
	11th to 20th	Day	15% 9% 2 6% 5% 4 4 4 5% 6% 40%	2374
	21st to end	Day	20% 8% 3 7% 5% 4 4 3 4 7% 34%	2540
May	1st to 10th	Day	14% 7% 3 6% 4 4 4 3 5% 6% 43%	5862
	11th to 20th	Day	15% 7% 2 6% 4 3 4 3 5% 7% 46%	5862
	21st to end	Day	18% 7% 2 5% 4 4 4 3 5% 7% 41%	6635
June	1st to 10th	Day	7% 5% 2 5% 4 5% 5% 4 7% 9% 49%	2800
	11th to 20th	Day	7% 6% 2 5% 4 4 5% 4 7% 9% 46%	2800
	21st to end	Day	6% 3 2 5% 5% 4 5% 4 6% 9% 52%	2800
July	1st to 10th	Day	9% 5% 2 6% 4 4 5% 4 6% 8% 46%	5932
	11th to 20th	Day	9% 5% 2 6% 4 4 5% 5% 7% 9% 47%	5900
	21st to end	Day	7% 5% 2 6% 5% 5% 5% 5% 7% 10% 43%	6422
August	1st to 10th	Day	5% 4 1 5% 4 4 5% 4 6% 9% 53%	4234
	11th to 20th	Day	12% 5% 2 5% 4 4 4 4 5% 8% 48%	4171
	21st to end	Day	6% 5% 1 4 3 4 4 4 5% 8% 55%	4396
September	1st to 10th	Day	13% 5% 2 5% 3 3 3 3 6% 6% 52%	2316
	11th to 20th	Day	9% 5% 2 5% 5% 4 5% 3 5% 7% 50%	2114
	21st to end	Day	9% 5% 2 5% 4 3 4 3 5% 6% 55%	2074
October	1st to 10th	Day	12% 5% 2 6% 2 3 3 3 5% 6% 53%	1900
	11th to 20th	Day	12% 7% 2 4 3 3 3 2 4 5% 55%	1900
	21st to end	Day	15% 7% 2 6% 3 4 3 3 5% 7% 46%	2090
November	1st to 10th	Day	10% 6% 2 5% 3 3 4 3 5% 6% 54%	1958
	11th to 20th	Day	15% 7% 2 4 3 3 3 2 5% 5% 50%	1708
	21st to end	Day	16% 9% 3 7% 3 2 3 3 3 5% 47%	1600
December	1st to 10th	Day	6% 6% 2 7% 5% 3 4 3 4 6% 54%	2610
	11th to 20th	Day	11% 8% 3 7% 4 4 3 3 4 5% 48%	3008
	21st to end	Day	19% 17% 6% 11% 4 4 4 3 4 4 24%	4139
January	1st to 10th	Night	12% 9% 4 15% 5% 5% 4 2 4 5% 35%	5888
	11th to 20th	Night	9% 9% 3 9% 5% 6% 5% 4 4 4 43%	5900
	21st to end	Night	14% 10% 5% 9% 4 4 3 3 4 5% 39%	6490
February	1st to 10th	Night	12% 12% 3 7% 5% 4 4 4 5% 6% 38%	2600
	11th to 20th	Night	12% 10% 3 8% 5% 4 4 3 4 6% 42%	2533
	21st to end	Night	13% 8% 3 7% 4 3 4 3 4 5% 47%	1948
March	1st to 10th	Night	16% 9% 3 5% 2 2 3 3 4 5% 50%	4919
	11th to 20th	Night	10% 6% 2 4 3 2 3 3 5% 7% 56%	4980
	21st to end	Night	15% 9% 4 7% 4 4 4 3 6% 7% 37%	5467
April	1st to 10th	Night	11% 7% 3 6% 3 4 3 4 4 6% 49%	2085
	11th to 20th	Night	14% 7% 3 5% 4 3 3 3 5% 6% 47%	1975
	21st to end	Night	18% 7% 2 7% 4 3 4 3 5% 6% 41%	1855
May	1st to 10th	Night	15% 7% 2 6% 3 3 3 3 5% 7% 44%	4053
	11th to 20th	Night	14% 6% 2 5% 3 3 3 4 4 6% 50%	4053
	21st to end	Night	17% 6% 2 5% 4 3 3 3 4 5% 49%	4224
June	1st to 10th	Night	5% 3 2 3 4 5% 5% 4 6% 9% 55%	1600
	11th to 20th	Night	5% 4 2 4 4 4 4 4 7% 11% 50%	1600
	21st to end	Night	4 3 1 3 3 3 4 3 7% 8% 61%	1600
July	1st to 10th	Night	8% 6% 2 5% 4 3 3 4 6% 9% 50%	4025
	11th to 20th	Night	5% 4 2 5% 4 4 4 4 6% 10% 53%	4077
	21st to end	Night	8% 4 2 5% 4 4 5% 4 8% 11% 45%	4449
August	1st to 10th	Night	2 2 1 2 3 3 4 4 6% 10% 62%	2926
	11th to 20th	Night	12% 6% 2 5% 3 3 3 3 5% 6% 52%	2888
	21st to end	Night	4 4 1 6% 4 4 4 3 5% 8% 59%	3490
September	1st to 10th	Night	10% 5% 2 5% 3 3 3 3 5% 6% 56%	1930
	11th to 20th	Night	8% 4 2 4 3 3 4 4 6% 7% 55%	2061
	21st to end	Night	7% 4 2 5% 3 4 3 3 4 6% 58%	2090
October	1st to 10th	Night	11% 5% 2 4 3 3 3 3 4 5% 58%	2276
	11th to 20th	Night	13% 6% 1 4 3 3 2 2 4 5% 57%	2280
	21st to end	Night	15% 7% 3 4 3 3 3 2 3 5% 51%	2508
November	1st to 10th	Night	10% 4 2 4 3 3 3 2 4 5% 60%	2340
	11th to 20th	Night	12% 6% 1 4 4 3 3 2 4 6% 54%	2687
	21st to end	Night	14% 9% 2 5% 3 2 3 2 4 5% 51%	2800
December	1st to 10th	Night	7% 6% 2 5% 3 3 3 4 5% 6% 54%	4580
	11th to 20th	Night	12% 8% 4 6% 3 3 3 3 5% 7% 45%	5199
	21st to end	Night	21% 16% 5% 9% 4 3 3 3 3 4 29%	6834

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	40% 26% 8% 19% 6% 1	4078
	11th to 20th	Day	38% 26% 8% 14% 11% 4	4080
	21st to end	Day	39% 28% 7% 9% 15% 2	4488
February	1st to 10th	Day	21% 62% 6% 7% 4 1	1800
	11th to 20th	Day	19% 60% 5% 8% 7% 1	1763
	21st to end	Day	16% 61% 3 8% 9% 2	1698
March	1st to 10th	Day	27% 28% 5% 15% 20% 5%	4936
	11th to 20th	Day	18% 27% 7% 16% 26% 5%	4980
	21st to end	Day	34% 29% 11% 21% 4	5464
April	1st to 10th	Day	18% 62% 5% 8% 6% 1	2315
	11th to 20th	Day	16% 63% 6% 9% 6%	2374
	21st to end	Day	21% 62% 4 9% 5%	2540
May	1st to 10th	Day	29% 29% 8% 22% 12% 1	5900
	11th to 20th	Day	27% 28% 9% 19% 14% 3	5866
	21st to end	Day	31% 28% 5% 25% 9% 1	6649
June	1st to 10th	Day	12% 63% 5% 11% 8% 2	2800
	11th to 20th	Day	13% 63% 6% 12% 6% 1	2800
	21st to end	Day	12% 62% 8% 12% 5% 1	2800
July	1st to 10th	Day	26% 28% 9% 20% 14% 1	5868
	11th to 20th	Day	26% 28% 10% 24% 11% 1	5831
	21st to end	Day	24% 29% 12% 28% 7% 1	6240
August	1st to 10th	Day	18% 38% 9% 20% 14% 1	4220
	11th to 20th	Day	24% 37% 13% 16% 10%	4210
	21st to end	Day	19% 37% 11% 23% 7% 2	4395
September	1st to 10th	Day	11% 59% 7% 12% 8% 2	2316
	11th to 20th	Day	12% 60% 6% 13% 9% 1	2114
	21st to end	Day	15% 60% 4 12% 9% 1	2074
October	1st to 10th	Day	10% 36% 3 11% 34% 6%	3160
	11th to 20th	Day	8% 36% 1 16% 31% 8%	3140
	21st to end	Day	19% 37% 5% 18% 19% 2	3428
November	1st to 10th	Day	17% 56% 5% 12% 8% 2	1958
	11th to 20th	Day	17% 57% 3 10% 10% 2	1708
	21st to end	Day	21% 56% 3 13% 8%	1600
December	1st to 10th	Day	18% 36% 9% 24% 13% 1	2610
	11th to 20th	Day	26% 31% 8% 26% 8% 1	3005
	21st to end	Day	54% 26% 7% 9% 3 1	4139
January	1st to 10th	Night	45% 25% 8% 15% 6%	5888
	11th to 20th	Night	36% 26% 7% 16% 12% 3	5900
	21st to end	Night	37% 27% 7% 11% 14% 4	6490
February	1st to 10th	Night	19% 62% 6% 9% 5% 1	2600
	11th to 20th	Night	20% 60% 4 9% 7%	2534
	21st to end	Night	15% 61% 3 8% 9% 3	1948
March	1st to 10th	Night	30% 28% 4 15% 20% 2	4919
	11th to 20th	Night	17% 28% 4 17% 27% 7%	4980
	21st to end	Night	33% 29% 11% 19% 6% 2	5467
April	1st to 10th	Night	16% 62% 4 8% 8% 1	2085
	11th to 20th	Night	15% 63% 4 12% 6% 1	1975
	21st to end	Night	19% 62% 4 9% 5% 1	1855
May	1st to 10th	Night	29% 29% 9% 20% 13%	4080
	11th to 20th	Night	27% 28% 8% 19% 13% 5%	4054
	21st to end	Night	28% 28% 4 22% 17%	4232
June	1st to 10th	Night	9% 62% 7% 12% 9% 1	1600
	11th to 20th	Night	11% 63% 5% 12% 9% 1	1600
	21st to end	Night	7% 61% 8% 16% 7% 1	1600
July	1st to 10th	Night	25% 27% 10% 17% 19% 2	3982
	11th to 20th	Night	22% 28% 12% 25% 12%	4026
	21st to end	Night	23% 27% 14% 29% 6%	4320
August	1st to 10th	Night	10% 38% 15% 18% 17% 3	2916
	11th to 20th	Night	24% 37% 8% 19% 12% 1	2915
	21st to end	Night	19% 37% 10% 26% 8% 1	3490
September	1st to 10th	Night	12% 59% 5% 11% 9% 3	1930
	11th to 20th	Night	9% 60% 5% 13% 12% 2	2061
	21st to end	Night	14% 60% 3 12% 10% 1	2090
October	1st to 10th	Night	11% 36% 3 10% 35% 5%	3796
	11th to 20th	Night	9% 36% 2 18% 25% 10%	3779
	21st to end	Night	21% 37% 4 21% 17% 1	4120
November	1st to 10th	Night	14% 55% 5% 12% 11% 2	2340
	11th to 20th	Night	14% 56% 4 10% 12% 3	2687
	21st to end	Night	19% 56% 4 12% 9%	2800
December	1st to 10th	Night	16% 36% 9% 25% 14%	4580
	11th to 20th	Night	27% 31% 9% 20% 11% 2	5201
	21st to end	Night	50% 26% 7% 13% 4 1	6834

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	23% 18% 37% 18% 4	300
	11th to 20th	Day	27% 19% 39% 13% 2	300
	21st to end	Day	17% 19% 45% 17% 2	330
February	1st to 10th	Day	26% 23% 38% 12% 1	300
	11th to 20th	Day	24% 23% 37% 11% 5%	300
	21st to end	Day	19% 27% 39% 12% 3	249
March	1st to 10th	Day	18% 25% 43% 13% 2	300
	11th to 20th	Day	31% 16% 32% 18% 2	300
	21st to end	Day	35% 21% 30% 11% 2 1	330
April	1st to 10th	Day	27% 17% 34% 16% 5%	415
	11th to 20th	Day	22% 19% 34% 18% 6%	492
	21st to end	Day	25% 18% 34% 16% 7%	640
May	1st to 10th	Day	21% 15% 36% 21% 7% 1	703
	11th to 20th	Day	21% 13% 27% 27% 10% 3	725
	21st to end	Day	19% 11% 30% 23% 14% 3	789
June	1st to 10th	Day	7% 5% 26% 34% 23% 6%	730
	11th to 20th	Day	9% 4 28% 37% 17% 4	730
	21st to end	Day	7% 7% 38% 36% 12% 1	730
July	1st to 10th	Day	11% 4 17% 34% 26% 8%	721
	11th to 20th	Day	7% 2 24% 39% 22% 5%	718
	21st to end	Day	9% 2 20% 39% 25% 5%	794
August	1st to 10th	Day	7% 3 24% 38% 24% 4	726
	11th to 20th	Day	9% 5% 19% 39% 24% 5%	715
	21st to end	Day	9% 2 19% 33% 29% 7%	641
September	1st to 10th	Day	13% 4 18% 38% 22% 5%	502
	11th to 20th	Day	6% 4 23% 41% 20% 5%	324
	21st to end	Day	12% 10% 28% 34% 11% 5%	300
October	1st to 10th	Day	15% 7% 31% 27% 15% 5%	300
	11th to 20th	Day	12% 22% 40% 20% 5% 1	300
	21st to end	Day	21% 23% 33% 19% 4	330
November	1st to 10th	Day	17% 15% 38% 22% 7% 1	300
	11th to 20th	Day	21% 19% 33% 19% 6% 1	300
	21st to end	Day	26% 15% 32% 20% 6%	300
December	1st to 10th	Day	11% 19% 41% 22% 5% 2	300
	11th to 20th	Day	21% 24% 33% 17% 5%	300
	21st to end	Day	24% 25% 36% 14% 2	330
January	1st to 10th	Night	13% 16% 37% 27% 6%	1000
	11th to 20th	Night	17% 16% 38% 23% 5% 1	1000
	21st to end	Night	15% 14% 41% 27% 3	1100
February	1st to 10th	Night	18% 16% 42% 21% 3	1000
	11th to 20th	Night	19% 17% 36% 25% 3	979
	21st to end	Night	19% 15% 42% 20% 4	628
March	1st to 10th	Night	17% 13% 40% 25% 4	600
	11th to 20th	Night	23% 11% 35% 25% 6%	600
	21st to end	Night	28% 14% 35% 20% 3	660
April	1st to 10th	Night	14% 16% 39% 27% 4	600
	11th to 20th	Night	20% 16% 33% 27% 5%	593
	21st to end	Night	21% 13% 36% 24% 6% 1	600
May	1st to 10th	Night	19% 9% 35% 30% 6% 1	600
	11th to 20th	Night	16% 8% 27% 34% 13% 1	591
	21st to end	Night	13% 7% 31% 35% 12% 2	650
June	1st to 10th	Night	7% 4 22% 44% 22% 1	600
	11th to 20th	Night	7% 4 29% 44% 16% 1	600
	21st to end	Night	6% 4 35% 42% 13% 1	600
July	1st to 10th	Night	8% 2 15% 45% 27% 3	585
	11th to 20th	Night	4 2 21% 44% 26% 2	582
	21st to end	Night	8% 2 15% 46% 28% 1	657
August	1st to 10th	Night	5% 2 20% 48% 25% 1	597
	11th to 20th	Night	8% 2 17% 41% 30% 2	594
	21st to end	Night	7% 2 17% 42% 31% 2	660
September	1st to 10th	Night	13% 2 17% 42% 22% 3	579
	11th to 20th	Night	10% 3 22% 40% 22% 3	570
	21st to end	Night	9% 5% 23% 43% 18% 2	570
October	1st to 10th	Night	13% 6% 29% 32% 18% 2	756
	11th to 20th	Night	16% 11% 38% 28% 7%	760
	21st to end	Night	20% 13% 32% 28% 7%	836
November	1st to 10th	Night	13% 10% 35% 32% 9% 1	780
	11th to 20th	Night	15% 17% 34% 26% 8%	998
	21st to end	Night	19% 13% 35% 28% 5%	1000
December	1st to 10th	Night	16% 14% 36% 27% 6% 1	1000
	11th to 20th	Night	20% 11% 37% 26% 5%	1000
	21st to end	Night	22% 17% 34% 24% 3	1100

Page generated at 2025-09-01 00:51:07. Version ac07

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