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 2024-01-12.

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% 7% 3 6% 5% 3 4 4 5% 7% 44%	74618
	Night	11% 7% 3 5% 4 3 4 4 5% 7% 48%	75107
Transparency	Day	39% 6% 13% 25% 15% 2	74341
	Night	36% 5% 12% 26% 18% 3	74904
Seeing	Day	15% 10% 29% 27% 15% 4	14494
	Night	14% 10% 32% 31% 12% 1	24470

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	13% 8% 3 5% 5% 3 5% 5% 4 6% 44%	1707
	11th to 20th	Day	14% 10% 4 7% 5% 4 4 4 4 6% 39%	1634
	21st to end	Day	12% 9% 4 8% 6% 3 4 4 5% 6% 38%	1782
February	1st to 10th	Day	15% 11% 5% 6% 6% 2 3 4 4 6% 38%	1620
	11th to 20th	Day	13% 10% 4 7% 5% 3 4 4 4 7% 39%	1574
	21st to end	Day	12% 10% 3 6% 6% 2 4 4 5% 6% 41%	1526
March	1st to 10th	Day	10% 10% 4 7% 6% 3 4 5% 5% 6% 40%	1980
	11th to 20th	Day	21% 10% 4 5% 5% 2 4 4 4 6% 36%	1980
	21st to end	Day	20% 13% 5% 6% 5% 3 4 4 4 5% 31%	2178
April	1st to 10th	Day	14% 7% 3 5% 5% 2 4 4 5% 8% 43%	2092
	11th to 20th	Day	14% 9% 3 5% 6% 3 5% 5% 4 7% 39%	2134
	21st to end	Day	19% 7% 4 7% 6% 3 5% 4 5% 6% 35%	2262
May	1st to 10th	Day	17% 8% 3 6% 5% 3 5% 4 5% 6% 36%	2340
	11th to 20th	Day	16% 7% 3 6% 5% 3 4 5% 4 6% 41%	2302
	21st to end	Day	14% 7% 3 8% 6% 3 5% 5% 7% 8% 36%	2621
June	1st to 10th	Day	7% 4 2 3 4 3 5% 5% 6% 11% 48%	2520
	11th to 20th	Day	7% 5% 2 5% 5% 3 5% 5% 7% 9% 47%	2520
	21st to end	Day	7% 3 2 4 4 2 5% 5% 6% 9% 53%	2520
July	1st to 10th	Day	9% 5% 2 4 4 3 5% 5% 7% 10% 45%	2372
	11th to 20th	Day	4 3 2 4 4 3 4 6% 7% 9% 54%	2340
	21st to end	Day	7% 5% 3 5% 5% 3 6% 7% 6% 9% 44%	2546
August	1st to 10th	Day	8% 4 2 5% 5% 3 5% 5% 6% 11% 45%	2328
	11th to 20th	Day	7% 3 3 6% 5% 2 5% 4 7% 9% 49%	2301
	21st to end	Day	8% 5% 2 4 4 2 4 4 5% 9% 52%	2412
September	1st to 10th	Day	12% 5% 2 4 4 2 3 4 6% 7% 52%	2160
	11th to 20th	Day	9% 5% 2 5% 4 3 5% 5% 5% 8% 51%	2021
	21st to end	Day	8% 4 2 4 5% 2 5% 4 4 6% 55%	1954
October	1st to 10th	Day	12% 6% 2 4 4 3 3 4 5% 6% 52%	1800
	11th to 20th	Day	13% 7% 2 4 4 2 2 3 4 5% 54%	1800
	21st to end	Day	16% 6% 3 5% 5% 3 3 3 5% 6% 46%	1980
November	1st to 10th	Day	9% 6% 2 5% 3 3 4 3 4 7% 54%	1858
	11th to 20th	Day	15% 6% 3 5% 3 2 3 3 4 6% 50%	1635
	21st to end	Day	15% 8% 5% 5% 4 2 3 3 4 5% 48%	1520
December	1st to 10th	Day	11% 8% 2 5% 6% 4 4 3 5% 7% 45%	1520
	11th to 20th	Day	12% 9% 4 7% 6% 3 4 4 4 6% 41%	1918
	21st to end	Day	16% 14% 8% 12% 6% 3 4 3 4 4 26%	2861
January	1st to 10th	Night	9% 9% 3 5% 5% 3 4 4 4 5% 48%	2458
	11th to 20th	Night	12% 9% 4 5% 6% 3 5% 4 4 6% 42%	2366
	21st to end	Night	10% 8% 4 7% 6% 3 4 5% 4 6% 43%	2574
February	1st to 10th	Night	13% 10% 4 6% 6% 4 4 4 5% 6% 38%	2340
	11th to 20th	Night	12% 8% 4 6% 5% 3 4 4 5% 6% 42%	2273
	21st to end	Night	14% 7% 2 7% 5% 3 4 3 4 5% 46%	1743
March	1st to 10th	Night	12% 7% 4 5% 4 3 3 4 4 6% 49%	1980
	11th to 20th	Night	17% 9% 3 6% 4 3 4 4 4 7% 41%	1980
	21st to end	Night	21% 10% 3 7% 5% 3 4 5% 4 6% 33%	2178
April	1st to 10th	Night	10% 7% 3 5% 4 3 4 4 5% 7% 50%	1868
	11th to 20th	Night	14% 7% 3 4 4 2 4 3 5% 7% 46%	1775
	21st to end	Night	17% 6% 3 6% 4 3 4 4 4 7% 43%	1695
May	1st to 10th	Night	15% 7% 3 6% 4 3 6% 4 6% 7% 41%	1620
	11th to 20th	Night	15% 6% 2 4 4 3 3 4 5% 7% 48%	1593
	21st to end	Night	10% 5% 2 6% 6% 3 5% 5% 6% 8% 45%	1651
June	1st to 10th	Night	5% 3 1 3 3 3 5% 5% 7% 11% 55%	1440
	11th to 20th	Night	5% 4 2 4 4 3 4 6% 6% 11% 50%	1440
	21st to end	Night	5% 2 1 3 4 2 3 5% 5% 10% 60%	1440
July	1st to 10th	Night	7% 3 2 3 4 3 5% 4 7% 11% 51%	1583
	11th to 20th	Night	3 2 1 3 3 2 4 4 6% 8% 62%	1620
	21st to end	Night	6% 4 2 4 5% 3 5% 6% 6% 9% 50%	1772
August	1st to 10th	Night	4 3 1 3 4 3 5% 6% 6% 10% 56%	1611
	11th to 20th	Night	7% 4 2 4 4 3 4 5% 5% 7% 57%	1600
	21st to end	Night	4 4 2 4 4 2 3 3 5% 8% 61%	1943
September	1st to 10th	Night	10% 4 2 4 5% 2 2 4 5% 7% 55%	1800
	11th to 20th	Night	9% 4 2 3 4 3 4 4 6% 7% 55%	1934
	21st to end	Night	7% 3 2 4 5% 3 4 4 5% 6% 58%	1987
October	1st to 10th	Night	11% 4 2 3 4 2 3 4 4 6% 57%	2160
	11th to 20th	Night	13% 4 2 4 4 2 2 3 4 4 56%	2160
	21st to end	Night	16% 7% 2 4 3 2 3 3 3 4 52%	2376
November	1st to 10th	Night	10% 4 2 3 3 2 3 3 4 5% 61%	2220
	11th to 20th	Night	10% 6% 3 4 4 2 3 4 4 7% 53%	2540
	21st to end	Night	14% 7% 3 4 4 1 3 3 4 6% 50%	2660
December	1st to 10th	Night	12% 7% 3 5% 5% 2 5% 4 4 7% 45%	2660
	11th to 20th	Night	12% 8% 4 6% 4 3 4 4 4 7% 45%	3279
	21st to end	Night	18% 17% 5% 9% 6% 3 3 3 3 3 29%	4788

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	41% 5% 11% 25% 18% 1	1708
	11th to 20th	Day	47% 4 13% 24% 12% 1	1634
	21st to end	Day	45% 5% 16% 21% 11% 1	1782
February	1st to 10th	Day	49% 4 13% 21% 10% 2	1620
	11th to 20th	Day	46% 5% 13% 20% 14% 2	1583
	21st to end	Day	44% 4 12% 24% 14% 3	1526
March	1st to 10th	Day	45% 5% 11% 22% 14% 3	1980
	11th to 20th	Day	51% 6% 9% 21% 11% 2	1980
	21st to end	Day	55% 6% 13% 17% 8% 1	2178
April	1st to 10th	Day	40% 6% 12% 24% 16% 2	2092
	11th to 20th	Day	44% 6% 13% 22% 14% 1	2134
	21st to end	Day	51% 4 11% 23% 10%	2262
May	1st to 10th	Day	49% 7% 11% 20% 12% 1	2340
	11th to 20th	Day	44% 8% 13% 23% 13%	2306
	21st to end	Day	45% 9% 14% 20% 10% 2	2621
June	1st to 10th	Day	28% 8% 18% 30% 14% 1	2520
	11th to 20th	Day	32% 7% 15% 29% 16% 2	2520
	21st to end	Day	26% 9% 16% 30% 15% 4	2520
July	1st to 10th	Day	32% 9% 16% 24% 16% 3	2308
	11th to 20th	Day	24% 9% 17% 28% 19% 3	2271
	21st to end	Day	32% 9% 14% 31% 13% 1	2405
August	1st to 10th	Day	32% 9% 18% 27% 13% 1	2314
	11th to 20th	Day	30% 8% 14% 31% 15% 2	2301
	21st to end	Day	28% 8% 13% 26% 19% 6%	2412
September	1st to 10th	Day	32% 6% 13% 26% 18% 6%	2160
	11th to 20th	Day	31% 6% 13% 24% 24% 2	2021
	21st to end	Day	29% 5% 10% 30% 22% 3	1954
October	1st to 10th	Day	32% 5% 12% 28% 20% 3	1800
	11th to 20th	Day	33% 4 8% 27% 23% 5%	1800
	21st to end	Day	40% 5% 10% 21% 19% 5%	1980
November	1st to 10th	Day	31% 5% 12% 28% 19% 5%	1858
	11th to 20th	Day	37% 4 10% 26% 21% 3	1635
	21st to end	Day	40% 4 8% 27% 19% 1	1520
December	1st to 10th	Day	39% 5% 13% 29% 13% 1	1520
	11th to 20th	Day	44% 5% 12% 26% 10% 2	1915
	21st to end	Day	60% 5% 10% 16% 7% 1	2861
January	1st to 10th	Night	38% 5% 13% 25% 17% 2	2458
	11th to 20th	Night	43% 5% 13% 25% 13% 1	2366
	21st to end	Night	42% 5% 14% 24% 13% 2	2574
February	1st to 10th	Night	46% 5% 12% 21% 13% 3	2340
	11th to 20th	Night	43% 5% 12% 20% 17% 3	2274
	21st to end	Night	41% 4 10% 22% 17% 5%	1743
March	1st to 10th	Night	36% 5% 11% 24% 20% 4	1980
	11th to 20th	Night	44% 5% 11% 22% 14% 4	1980
	21st to end	Night	52% 6% 12% 19% 9% 2	2178
April	1st to 10th	Night	35% 5% 11% 25% 20% 4	1868
	11th to 20th	Night	39% 5% 9% 28% 16% 3	1775
	21st to end	Night	42% 5% 11% 25% 16% 1	1695
May	1st to 10th	Night	42% 7% 12% 22% 15% 1	1620
	11th to 20th	Night	35% 8% 14% 25% 16% 1	1594
	21st to end	Night	36% 8% 16% 27% 12% 2	1652
June	1st to 10th	Night	22% 7% 19% 32% 16% 3	1440
	11th to 20th	Night	26% 8% 15% 30% 19% 2	1440
	21st to end	Night	20% 6% 14% 35% 22% 4	1440
July	1st to 10th	Night	26% 8% 17% 30% 16% 4	1538
	11th to 20th	Night	19% 6% 15% 35% 22% 4	1566
	21st to end	Night	26% 8% 13% 32% 18% 2	1673
August	1st to 10th	Night	22% 9% 19% 33% 15% 3	1601
	11th to 20th	Night	26% 6% 12% 32% 23% 2	1600
	21st to end	Night	23% 5% 12% 28% 25% 7%	1943
September	1st to 10th	Night	30% 5% 11% 27% 20% 7%	1800
	11th to 20th	Night	28% 6% 10% 27% 25% 5%	1934
	21st to end	Night	28% 5% 8% 28% 28% 5%	1987
October	1st to 10th	Night	29% 5% 10% 26% 24% 6%	2160
	11th to 20th	Night	32% 3 7% 28% 22% 7%	2160
	21st to end	Night	38% 4 9% 22% 24% 4	2376
November	1st to 10th	Night	27% 4 12% 27% 24% 6%	2220
	11th to 20th	Night	32% 4 9% 26% 24% 5%	2540
	21st to end	Night	38% 3 10% 28% 18% 3	2660
December	1st to 10th	Night	38% 6% 13% 26% 16% 1	2660
	11th to 20th	Night	39% 5% 11% 28% 15% 1	3281
	21st to end	Night	60% 5% 8% 17% 9% 2	4788

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% 36% 20% 4	270
	11th to 20th	Day	31% 17% 38% 14%	245
	21st to end	Day	16% 17% 49% 14% 3	264
February	1st to 10th	Day	23% 21% 40% 14% 2	240
	11th to 20th	Day	20% 25% 38% 13% 3	240
	21st to end	Day	20% 28% 37% 11% 4	198
March	1st to 10th	Day	18% 19% 46% 15% 3	240
	11th to 20th	Day	33% 11% 35% 18% 3	240
	21st to end	Day	34% 21% 31% 12% 3	264
April	1st to 10th	Day	20% 18% 38% 17% 7%	352
	11th to 20th	Day	20% 17% 36% 21% 6% 1	412
	21st to end	Day	21% 18% 35% 16% 8% 1	522
May	1st to 10th	Day	20% 13% 38% 20% 8% 1	603
	11th to 20th	Day	20% 11% 31% 25% 11% 2	625
	21st to end	Day	18% 7% 29% 27% 15% 5%	679
June	1st to 10th	Day	7% 4 20% 35% 28% 5%	630
	11th to 20th	Day	9% 4 26% 39% 19% 3	630
	21st to end	Day	7% 7% 32% 36% 16% 2	630
July	1st to 10th	Day	13% 2 14% 30% 31% 10%	621
	11th to 20th	Day	4 2 22% 36% 27% 9%	618
	21st to end	Day	8% 3 17% 39% 28% 6%	684
August	1st to 10th	Day	6% 3 19% 39% 28% 4	626
	11th to 20th	Day	9% 3 16% 38% 27% 6%	615
	21st to end	Day	9% 1 16% 33% 31% 10%	531
September	1st to 10th	Day	15% 3 17% 36% 24% 6%	450
	11th to 20th	Day	6% 2 23% 42% 22% 5%	311
	21st to end	Day	10% 7% 29% 33% 14% 6%	270
October	1st to 10th	Day	14% 7% 35% 24% 14% 6%	270
	11th to 20th	Day	14% 20% 40% 18% 7%	270
	21st to end	Day	24% 19% 32% 21% 5% 1	297
November	1st to 10th	Day	15% 13% 37% 24% 8% 3	270
	11th to 20th	Day	19% 19% 31% 20% 9% 1	270
	21st to end	Day	23% 14% 36% 23% 6%	270
December	1st to 10th	Day	14% 17% 39% 23% 4 4	270
	11th to 20th	Day	22% 17% 37% 18% 5% 1	270
	21st to end	Day	20% 26% 37% 17%	297
January	1st to 10th	Night	14% 14% 40% 25% 6%	950
	11th to 20th	Night	17% 14% 40% 24% 5% 1	910
	21st to end	Night	14% 14% 42% 27% 3	990
February	1st to 10th	Night	17% 15% 42% 22% 4	900
	11th to 20th	Night	18% 15% 39% 25% 3	879
	21st to end	Night	19% 17% 40% 19% 4	559
March	1st to 10th	Night	16% 13% 43% 24% 5%	540
	11th to 20th	Night	23% 11% 33% 27% 6%	540
	21st to end	Night	26% 13% 35% 22% 4	594
April	1st to 10th	Night	14% 12% 41% 26% 6%	540
	11th to 20th	Night	19% 13% 33% 29% 6%	533
	21st to end	Night	20% 11% 37% 26% 6%	540
May	1st to 10th	Night	17% 9% 35% 31% 7% 1	540
	11th to 20th	Night	17% 7% 29% 34% 13% 1	531
	21st to end	Night	12% 6% 29% 34% 16% 3	584
June	1st to 10th	Night	7% 3 19% 46% 23% 2	540
	11th to 20th	Night	6% 2 26% 44% 19% 1	540
	21st to end	Night	6% 2 31% 47% 14% 1	540
July	1st to 10th	Night	8% 2 12% 44% 32% 3	525
	11th to 20th	Night	3 3 16% 45% 31% 2	522
	21st to end	Night	8% 1 15% 45% 30% 1	591
August	1st to 10th	Night	4 2 14% 47% 32% 1	537
	11th to 20th	Night	7% 2 14% 44% 30% 3	534
	21st to end	Night	6% 1 14% 40% 38% 2	594
September	1st to 10th	Night	12% 3 18% 43% 22% 4	540
	11th to 20th	Night	11% 1 21% 39% 23% 5%	540
	21st to end	Night	8% 5% 25% 41% 19% 3	547
October	1st to 10th	Night	12% 6% 28% 35% 18% 2	720
	11th to 20th	Night	16% 9% 40% 28% 7%	720
	21st to end	Night	20% 13% 32% 25% 9%	792
November	1st to 10th	Night	11% 10% 37% 31% 11% 1	740
	11th to 20th	Night	13% 14% 38% 26% 9%	923
	21st to end	Night	19% 12% 38% 26% 5%	950
December	1st to 10th	Night	17% 12% 39% 25% 6% 1	950
	11th to 20th	Night	19% 11% 38% 28% 4	950
	21st to end	Night	19% 18% 37% 23% 3	1045

Page generated at 2024-01-09 15:24:25. Version ac07

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