Lees Summit
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lees Summit 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	11% 7% 3 6% 4 4 4 3 5% 7% 45%	126518
	Night	11% 7% 3 6% 4 4 4 3 5% 7% 47%	124063
Transparency	Day	38% 5% 12% 26% 17% 3	130130
	Night	37% 4 11% 26% 19% 4	128527
Seeing	Day	15% 10% 30% 27% 15% 3	17083
	Night	14% 10% 32% 31% 12% 1	26886

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 10% 4 5% 4 3 4 5% 37%	4077
	11th to 20th	Day	8% 8% 4 10% 6% 7% 6% 3 4 5% 40%	4080
	21st to end	Day	13% 14% 4 8% 4 4 4 3 4 4 38%	4488
February	1st to 10th	Day	14% 12% 5% 7% 6% 3 4 3 5% 6% 36%	1800
	11th to 20th	Day	13% 11% 3 8% 4 4 4 2 4 6% 40%	1754
	21st to end	Day	11% 10% 3 6% 4 3 4 3 5% 7% 44%	1702
March	1st to 10th	Day	12% 9% 3 6% 3 3 2 2 3 5% 51%	4936
	11th to 20th	Day	10% 6% 2 5% 3 3 3 3 4 6% 55%	4980
	21st to end	Day	12% 11% 4 7% 5% 4 5% 4 6% 7% 35%	5462
April	1st to 10th	Day	14% 8% 2 6% 4 3 4 3 5% 7% 44%	2325
	11th to 20th	Day	14% 9% 2 6% 5% 4 5% 4 5% 7% 39%	2374
	21st to end	Day	19% 9% 3 8% 5% 5% 4 4 5% 6% 34%	2514
May	1st to 10th	Day	14% 8% 2 6% 4 4 4 3 6% 7% 42%	5862
	11th to 20th	Day	14% 6% 2 6% 4 3 4 4 5% 7% 44%	5862
	21st to end	Day	19% 6% 2 6% 3 3 4 3 5% 7% 41%	6663
June	1st to 10th	Day	8% 5% 1 4 4 4 6% 4 7% 11% 48%	2800
	11th to 20th	Day	8% 5% 2 5% 5% 4 4 4 7% 9% 46%	2800
	21st to end	Day	6% 3 2 5% 4 4 5% 4 6% 9% 52%	2800
July	1st to 10th	Day	9% 6% 2 6% 4 4 4 3 6% 9% 46%	5960
	11th to 20th	Day	8% 5% 2 6% 4 4 4 4 7% 9% 48%	5900
	21st to end	Day	7% 5% 2 6% 5% 5% 6% 6% 7% 11% 41%	6422
August	1st to 10th	Day	5% 4 2 5% 4 4 4 4 5% 10% 53%	4234
	11th to 20th	Day	11% 4 2 6% 4 3 4 4 6% 8% 47%	4171
	21st to end	Day	5% 4 2 5% 3 3 4 4 6% 9% 55%	4378
September	1st to 10th	Day	12% 5% 2 4 3 3 3 3 6% 7% 52%	2400
	11th to 20th	Day	9% 5% 2 5% 4 4 5% 4 6% 8% 49%	2245
	21st to end	Day	9% 5% 2 5% 4 3 5% 3 4 6% 54%	2170
October	1st to 10th	Day	11% 5% 2 5% 3 3 3 3 5% 6% 54%	2000
	11th to 20th	Day	12% 6% 2 5% 3 2 2 3 4 5% 55%	2000
	21st to end	Day	17% 6% 3 6% 4 3 3 2 5% 6% 46%	2200
November	1st to 10th	Day	9% 6% 2 5% 3 4 3 3 4 7% 53%	2058
	11th to 20th	Day	14% 6% 2 5% 3 2 3 3 4 6% 51%	1781
	21st to end	Day	15% 9% 3 6% 4 2 3 2 4 4 48%	1600
December	1st to 10th	Day	7% 6% 2 6% 5% 4 3 3 5% 6% 55%	2610
	11th to 20th	Day	10% 7% 3 7% 5% 3 4 3 4 6% 48%	3008
	21st to end	Day	17% 18% 7% 11% 4 4 3 3 4 4 25%	4102
January	1st to 10th	Night	12% 10% 4 14% 6% 5% 4 3 4 5% 36%	5888
	11th to 20th	Night	9% 9% 3 9% 6% 6% 5% 3 4 4 42%	5900
	21st to end	Night	14% 9% 4 9% 4 4 3 3 4 5% 40%	6490
February	1st to 10th	Night	12% 11% 3 7% 5% 5% 4 4 5% 6% 39%	2600
	11th to 20th	Night	12% 10% 4 8% 5% 4 4 3 5% 6% 42%	2533
	21st to end	Night	13% 7% 2 7% 4 4 4 3 4 5% 47%	1942
March	1st to 10th	Night	13% 10% 3 6% 3 3 3 3 4 5% 48%	4919
	11th to 20th	Night	8% 7% 2 4 3 3 3 3 5% 7% 55%	4980
	21st to end	Night	13% 9% 4 8% 5% 4 4 4 5% 7% 37%	5467
April	1st to 10th	Night	11% 7% 2 6% 4 3 4 3 5% 6% 49%	2074
	11th to 20th	Night	14% 7% 3 5% 4 3 3 3 5% 7% 47%	1975
	21st to end	Night	17% 7% 3 6% 4 3 4 3 4 7% 41%	1883
May	1st to 10th	Night	15% 7% 2 6% 3 3 4 3 5% 7% 44%	4053
	11th to 20th	Night	14% 6% 2 5% 3 3 3 3 5% 7% 49%	4053
	21st to end	Night	16% 5% 2 6% 4 3 3 2 4 5% 49%	4196
June	1st to 10th	Night	6% 3 1 4 3 4 5% 4 7% 10% 53%	1600
	11th to 20th	Night	5% 4 2 5% 4 4 4 5% 7% 11% 50%	1600
	21st to end	Night	5% 2 1 4 4 3 3 4 7% 9% 59%	1600
July	1st to 10th	Night	9% 5% 2 5% 3 4 4 3 6% 9% 49%	3985
	11th to 20th	Night	6% 4 2 5% 4 4 4 3 5% 10% 53%	4077
	21st to end	Night	7% 4 2 5% 5% 4 5% 5% 7% 12% 44%	4449
August	1st to 10th	Night	2 2 1 2 3 3 4 4 7% 10% 63%	2926
	11th to 20th	Night	11% 6% 2 5% 3 4 3 3 5% 6% 51%	2888
	21st to end	Night	4 3 2 5% 4 3 4 3 5% 8% 59%	3521
September	1st to 10th	Night	10% 5% 2 6% 4 2 2 3 4 6% 55%	2000
	11th to 20th	Night	9% 4 2 4 3 4 4 4 6% 8% 53%	2150
	21st to end	Night	7% 4 2 5% 4 4 3 3 5% 6% 57%	2209
October	1st to 10th	Night	10% 4 2 4 3 3 3 3 5% 5% 59%	2400
	11th to 20th	Night	12% 5% 2 4 3 3 3 2 4 5% 57%	2400
	21st to end	Night	16% 7% 2 5% 3 3 3 2 4 4 51%	2640
November	1st to 10th	Night	10% 5% 2 4 3 3 3 2 4 5% 60%	2460
	11th to 20th	Night	10% 7% 2 4 3 3 3 3 5% 7% 53%	2768
	21st to end	Night	14% 8% 3 5% 4 2 3 2 4 5% 50%	2800
December	1st to 10th	Night	8% 6% 2 5% 4 3 4 3 5% 6% 55%	4580
	11th to 20th	Night	12% 7% 4 7% 3 3 4 3 5% 7% 45%	5199
	21st to end	Night	19% 17% 5% 9% 5% 4 3 3 4 4 29%	6858

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	50% 4 10% 24% 11% 1	4078
	11th to 20th	Day	48% 3 9% 21% 15% 4	4080
	21st to end	Day	50% 3 11% 15% 18% 3	4488
February	1st to 10th	Day	49% 4 12% 21% 11% 2	1800
	11th to 20th	Day	46% 5% 12% 20% 15% 2	1763
	21st to end	Day	40% 4 11% 24% 17% 4	1702
March	1st to 10th	Day	39% 3 7% 22% 22% 7%	4936
	11th to 20th	Day	31% 4 9% 21% 28% 7%	4980
	21st to end	Day	47% 5% 16% 25% 6% 1	5464
April	1st to 10th	Day	40% 6% 11% 24% 16% 2	2325
	11th to 20th	Day	44% 6% 13% 22% 15% 1	2374
	21st to end	Day	51% 4 12% 22% 10% 1	2514
May	1st to 10th	Day	42% 6% 12% 25% 15% 1	5900
	11th to 20th	Day	39% 6% 12% 23% 17% 3	5866
	21st to end	Day	42% 6% 10% 29% 12% 1	6677
June	1st to 10th	Day	29% 8% 17% 29% 15% 2	2800
	11th to 20th	Day	32% 7% 15% 29% 16% 2	2800
	21st to end	Day	27% 8% 16% 29% 16% 4	2800
July	1st to 10th	Day	36% 4 13% 26% 19% 2	5896
	11th to 20th	Day	33% 4 15% 30% 16% 1	5831
	21st to end	Day	35% 4 16% 35% 9% 1	6240
August	1st to 10th	Day	28% 6% 15% 29% 21% 1	4220
	11th to 20th	Day	35% 4 17% 27% 15% 1	4210
	21st to end	Day	27% 4 15% 35% 15% 4	4377
September	1st to 10th	Day	32% 5% 13% 25% 20% 6%	2400
	11th to 20th	Day	32% 5% 13% 25% 23% 2	2245
	21st to end	Day	31% 5% 9% 29% 23% 3	2170
October	1st to 10th	Day	19% 3 7% 22% 39% 10%	3260
	11th to 20th	Day	21% 2 5% 24% 39% 9%	3240
	21st to end	Day	34% 3 9% 25% 26% 3	3538
November	1st to 10th	Day	32% 4 11% 29% 19% 5%	2058
	11th to 20th	Day	36% 4 9% 27% 21% 3	1781
	21st to end	Day	40% 4 9% 27% 19% 1	1600
December	1st to 10th	Day	31% 3 12% 36% 17% 1	2610
	11th to 20th	Day	39% 3 12% 33% 12% 1	3005
	21st to end	Day	64% 4 10% 15% 6% 1	4102
January	1st to 10th	Night	52% 4 11% 22% 11% 1	5888
	11th to 20th	Night	46% 4 9% 22% 15% 4	5900
	21st to end	Night	47% 3 11% 17% 17% 5%	6490
February	1st to 10th	Night	45% 5% 12% 21% 14% 3	2600
	11th to 20th	Night	44% 5% 11% 20% 17% 3	2534
	21st to end	Night	39% 4 9% 23% 19% 6%	1942
March	1st to 10th	Night	39% 4 8% 20% 25% 4	4919
	11th to 20th	Night	29% 3 7% 23% 31% 7%	4980
	21st to end	Night	45% 6% 16% 23% 9% 2	5467
April	1st to 10th	Night	35% 5% 11% 23% 21% 4	2074
	11th to 20th	Night	38% 4 9% 28% 17% 4	1975
	21st to end	Night	43% 5% 12% 24% 14% 1	1883
May	1st to 10th	Night	40% 6% 14% 24% 16% 1	4080
	11th to 20th	Night	35% 6% 12% 24% 18% 6%	4054
	21st to end	Night	37% 5% 9% 28% 21% 1	4204
June	1st to 10th	Night	25% 7% 18% 31% 16% 3	1600
	11th to 20th	Night	26% 7% 14% 31% 19% 2	1600
	21st to end	Night	21% 5% 14% 34% 22% 4	1600
July	1st to 10th	Night	32% 4 14% 24% 22% 3	3942
	11th to 20th	Night	29% 3 15% 35% 17% 2	4026
	21st to end	Night	32% 3 17% 38% 10% 1	4320
August	1st to 10th	Night	17% 5% 22% 30% 22% 5%	2916
	11th to 20th	Night	34% 3 12% 30% 20% 1	2915
	21st to end	Night	25% 3 13% 38% 17% 5%	3521
September	1st to 10th	Night	30% 5% 10% 26% 22% 8%	2000
	11th to 20th	Night	28% 6% 10% 28% 23% 4	2150
	21st to end	Night	28% 4 8% 26% 29% 4	2209
October	1st to 10th	Night	18% 3 6% 21% 44% 8%	3920
	11th to 20th	Night	23% 2 6% 26% 30% 14%	3899
	21st to end	Night	35% 2 6% 30% 24% 3	4252
November	1st to 10th	Night	28% 4 11% 29% 23% 6%	2460
	11th to 20th	Night	32% 3 9% 27% 24% 5%	2768
	21st to end	Night	37% 3 10% 28% 18% 3	2800
December	1st to 10th	Night	30% 3 13% 35% 18% 1	4580
	11th to 20th	Night	40% 3 12% 27% 16% 2	5201
	21st to end	Night	61% 4 10% 18% 6% 1	6858

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	22% 18% 38% 19% 4	300
	11th to 20th	Day	25% 20% 40% 14% 1	300
	21st to end	Day	17% 17% 46% 16% 4	330
February	1st to 10th	Day	24% 19% 41% 14% 2	300
	11th to 20th	Day	22% 23% 39% 13% 3	300
	21st to end	Day	17% 28% 40% 12% 3	249
March	1st to 10th	Day	19% 18% 43% 17% 2	300
	11th to 20th	Day	30% 13% 36% 18% 4	300
	21st to end	Day	32% 21% 32% 12% 4	330
April	1st to 10th	Day	23% 19% 36% 16% 6%	425
	11th to 20th	Day	22% 18% 37% 18% 5% 1	492
	21st to end	Day	22% 17% 35% 17% 8%	614
May	1st to 10th	Day	19% 13% 37% 21% 8% 1	703
	11th to 20th	Day	19% 11% 29% 26% 11% 3	725
	21st to end	Day	19% 7% 30% 26% 14% 4	789
June	1st to 10th	Day	8% 5% 22% 34% 25% 5%	730
	11th to 20th	Day	9% 4 27% 38% 18% 3	730
	21st to end	Day	7% 6% 33% 37% 15% 2	730
July	1st to 10th	Day	12% 2 16% 30% 29% 10%	721
	11th to 20th	Day	4 3 22% 37% 26% 8%	718
	21st to end	Day	7% 3 17% 38% 28% 7%	794
August	1st to 10th	Day	5% 3 22% 39% 27% 4	726
	11th to 20th	Day	9% 3 18% 38% 26% 5%	715
	21st to end	Day	9% 1 17% 33% 30% 10%	623
September	1st to 10th	Day	13% 2 17% 37% 24% 6%	530
	11th to 20th	Day	7% 2 21% 42% 23% 6%	375
	21st to end	Day	12% 6% 27% 33% 15% 7%	330
October	1st to 10th	Day	12% 6% 34% 26% 15% 6%	330
	11th to 20th	Day	12% 18% 38% 22% 8% 1	330
	21st to end	Day	24% 18% 33% 21% 4 1	363
November	1st to 10th	Day	15% 15% 41% 20% 6% 3	330
	11th to 20th	Day	19% 18% 34% 20% 9% 1	321
	21st to end	Day	23% 15% 36% 21% 5%	300
December	1st to 10th	Day	13% 17% 41% 22% 4 3	300
	11th to 20th	Day	21% 18% 38% 17% 5% 1	300
	21st to end	Day	22% 24% 36% 17% 1	330
January	1st to 10th	Night	15% 14% 40% 25% 6%	1000
	11th to 20th	Night	16% 15% 40% 24% 4 1	1000
	21st to end	Night	14% 14% 43% 27% 3	1100
February	1st to 10th	Night	17% 16% 42% 22% 4	1000
	11th to 20th	Night	18% 16% 39% 24% 3	979
	21st to end	Night	18% 16% 42% 20% 4	622
March	1st to 10th	Night	17% 14% 42% 24% 4	600
	11th to 20th	Night	22% 11% 35% 26% 6%	600
	21st to end	Night	26% 13% 36% 21% 3	660
April	1st to 10th	Night	15% 14% 41% 25% 5%	600
	11th to 20th	Night	19% 15% 33% 28% 5%	593
	21st to end	Night	21% 11% 36% 26% 6%	600
May	1st to 10th	Night	17% 9% 36% 30% 7% 1	600
	11th to 20th	Night	16% 8% 28% 34% 13% 1	591
	21st to end	Night	13% 6% 30% 34% 14% 2	650
June	1st to 10th	Night	9% 3 19% 45% 22% 2	600
	11th to 20th	Night	7% 2 26% 45% 19% 2	600
	21st to end	Night	5% 2 33% 46% 14% 1	600
July	1st to 10th	Night	8% 2 13% 44% 30% 3	585
	11th to 20th	Night	4 3 18% 45% 29% 2	582
	21st to end	Night	7% 1 15% 44% 31% 2	657
August	1st to 10th	Night	4 2 16% 48% 30% 1	597
	11th to 20th	Night	8% 2 14% 43% 29% 4	594
	21st to end	Night	6% 1 13% 42% 36% 2	660
September	1st to 10th	Night	12% 2 17% 44% 22% 4	600
	11th to 20th	Night	11% 1 21% 41% 22% 5%	600
	21st to end	Night	9% 4 24% 40% 20% 3	609
October	1st to 10th	Night	11% 5% 29% 35% 18% 2	800
	11th to 20th	Night	15% 8% 39% 30% 8%	800
	21st to end	Night	20% 13% 33% 26% 8%	880
November	1st to 10th	Night	12% 10% 36% 31% 10%	820
	11th to 20th	Night	13% 14% 39% 26% 8%	1007
	21st to end	Night	19% 12% 38% 26% 5%	1000
December	1st to 10th	Night	17% 13% 38% 26% 6% 1	1000
	11th to 20th	Night	19% 11% 38% 27% 4	1000
	21st to end	Night	20% 17% 36% 24% 3	1100

Page generated at 2025-11-14 23:55:55. Version ac07

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