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 2024-11-08.

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% 8% 3 6% 4 4 4 3 5% 7% 45%	101073
	Night	11% 7% 3 6% 4 4 4 3 5% 6% 47%	98078
Transparency	Day	37% 5% 12% 26% 17% 2	104724
	Night	36% 5% 12% 26% 19% 3	102567
Seeing	Day	15% 10% 29% 27% 15% 3	15677
	Night	14% 10% 32% 31% 12% 1	25497

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	14% 10% 4 9% 4 5% 4 3 5% 6% 37%	2847
	11th to 20th	Day	11% 10% 4 10% 5% 7% 6% 2 3 4 37%	2850
	21st to end	Day	15% 17% 5% 9% 3 3 3 3 4 4 34%	3135
February	1st to 10th	Day	14% 12% 5% 7% 5% 3 4 3 5% 6% 37%	1710
	11th to 20th	Day	12% 11% 3 8% 4 4 4 3 4 7% 41%	1664
	21st to end	Day	11% 10% 3 6% 5% 3 4 3 5% 6% 43%	1619
March	1st to 10th	Day	13% 11% 3 6% 4 3 3 2 4 5% 46%	3436
	11th to 20th	Day	12% 7% 2 4 3 3 3 3 5% 6% 52%	3480
	21st to end	Day	16% 13% 4 6% 4 4 4 3 5% 6% 35%	3814
April	1st to 10th	Day	14% 8% 3 6% 4 3 4 4 5% 7% 44%	2209
	11th to 20th	Day	14% 9% 3 6% 5% 4 5% 4 5% 7% 39%	2254
	21st to end	Day	19% 8% 3 8% 5% 4 4 3 5% 6% 35%	2388
May	1st to 10th	Day	14% 9% 3 7% 4 5% 4 3 6% 7% 38%	4082
	11th to 20th	Day	16% 8% 2 7% 4 4 4 4 5% 7% 39%	4082
	21st to end	Day	12% 6% 2 7% 4 4 4 4 6% 7% 45%	4636
June	1st to 10th	Day	7% 5% 1 4 4 4 6% 4 7% 11% 48%	2660
	11th to 20th	Day	7% 5% 2 5% 5% 4 4 4 7% 9% 47%	2660
	21st to end	Day	6% 3 2 5% 4 4 5% 4 6% 8% 52%	2660
July	1st to 10th	Day	11% 7% 2 6% 4 4 4 3 6% 8% 42%	4166
	11th to 20th	Day	5% 4 2 5% 3 4 4 4 6% 10% 54%	4120
	21st to end	Day	5% 4 2 5% 4 5% 7% 6% 7% 11% 42%	4465
August	1st to 10th	Day	5% 4 1 5% 4 4 4 4 5% 10% 53%	4104
	11th to 20th	Day	11% 4 2 6% 4 3 4 4 6% 8% 47%	4041
	21st to end	Day	5% 4 2 5% 3 3 4 4 6% 9% 55%	4244
September	1st to 10th	Day	12% 5% 2 4 3 3 3 3 6% 7% 53%	2280
	11th to 20th	Day	9% 5% 2 5% 4 4 5% 4 5% 7% 50%	2133
	21st to end	Day	9% 5% 2 5% 4 3 5% 3 5% 6% 54%	2062
October	1st to 10th	Day	11% 5% 2 5% 3 3 3 3 5% 6% 54%	1900
	11th to 20th	Day	12% 7% 2 5% 3 2 2 2 4 5% 56%	1900
	21st to end	Day	15% 6% 3 6% 4 3 3 2 5% 6% 47%	2090
November	1st to 10th	Day	9% 7% 2 6% 3 4 3 3 4 7% 53%	1928
	11th to 20th	Day	15% 7% 2 5% 3 2 3 3 4 6% 50%	1635
	21st to end	Day	15% 9% 3 6% 4 3 3 2 4 4 48%	1520
December	1st to 10th	Day	10% 9% 3 5% 6% 5% 3 3 5% 7% 45%	1520
	11th to 20th	Day	11% 10% 4 8% 5% 4 4 3 5% 6% 40%	1918
	21st to end	Day	15% 14% 8% 13% 4 4 3 3 4 5% 26%	2861
January	1st to 10th	Night	9% 10% 3 13% 6% 5% 4 3 4 5% 39%	4108
	11th to 20th	Night	11% 10% 4 8% 6% 8% 6% 3 4 5% 36%	4120
	21st to end	Night	17% 12% 5% 10% 4 3 3 3 4 5% 34%	4532
February	1st to 10th	Night	12% 11% 3 7% 5% 5% 4 4 5% 6% 38%	2470
	11th to 20th	Night	12% 9% 3 7% 5% 3 4 3 5% 6% 43%	2403
	21st to end	Night	14% 7% 2 8% 4 4 4 3 4 5% 47%	1849
March	1st to 10th	Night	13% 10% 3 6% 3 3 3 3 4 5% 48%	3419
	11th to 20th	Night	11% 7% 2 4 2 3 3 3 4 7% 54%	3480
	21st to end	Night	14% 10% 4 9% 5% 4 3 4 4 6% 36%	3817
April	1st to 10th	Night	11% 7% 2 6% 4 3 3 3 5% 6% 49%	1971
	11th to 20th	Night	13% 7% 3 5% 4 3 3 3 5% 7% 46%	1875
	21st to end	Night	17% 7% 3 6% 4 3 4 3 4 7% 42%	1789
May	1st to 10th	Night	15% 7% 2 7% 4 4 5% 3 6% 7% 40%	2823
	11th to 20th	Night	15% 8% 2 6% 3 4 4 3 6% 7% 42%	2823
	21st to end	Night	11% 5% 2 6% 4 3 3 3 5% 6% 53%	2913
June	1st to 10th	Night	6% 3 1 3 3 4 5% 4 7% 10% 53%	1520
	11th to 20th	Night	5% 4 2 5% 4 4 4 5% 7% 11% 50%	1520
	21st to end	Night	5% 2 1 4 3 3 3 4 6% 9% 60%	1520
July	1st to 10th	Night	11% 6% 3 6% 3 5% 4 3 6% 8% 47%	2785
	11th to 20th	Night	3 2 1 4 3 3 4 3 6% 9% 61%	2850
	21st to end	Night	5% 4 1 5% 5% 4 5% 5% 7% 10% 48%	3098
August	1st to 10th	Night	2 2 1 3 3 3 4 4 7% 10% 63%	2836
	11th to 20th	Night	11% 6% 2 5% 3 4 3 3 5% 6% 51%	2798
	21st to end	Night	3 3 2 5% 4 3 4 3 5% 8% 60%	3413
September	1st to 10th	Night	10% 4 2 5% 4 2 2 3 5% 6% 56%	1900
	11th to 20th	Night	9% 4 2 4 3 3 4 4 6% 7% 54%	2042
	21st to end	Night	7% 4 2 5% 4 4 3 3 5% 6% 57%	2098
October	1st to 10th	Night	10% 4 2 4 3 3 3 3 5% 5% 59%	2280
	11th to 20th	Night	12% 5% 2 4 3 3 2 2 4 4 57%	2280
	21st to end	Night	15% 7% 2 5% 3 3 3 2 4 4 52%	2508
November	1st to 10th	Night	10% 5% 2 4 3 3 3 2 4 5% 60%	2311
	11th to 20th	Night	10% 7% 2 4 3 3 3 3 5% 7% 53%	2540
	21st to end	Night	14% 8% 3 5% 4 2 3 2 4 5% 50%	2660
December	1st to 10th	Night	12% 8% 3 5% 4 3 5% 3 5% 7% 45%	2660
	11th to 20th	Night	12% 8% 3 6% 3 4 4 4 4 7% 44%	3279
	21st to end	Night	18% 17% 5% 10% 5% 3 3 3 4 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	47% 5% 11% 24% 13% 1	2848
	11th to 20th	Day	52% 4 12% 21% 11%	2850
	21st to end	Day	53% 4 11% 16% 15% 1	3135
February	1st to 10th	Day	49% 4 13% 21% 11% 2	1710
	11th to 20th	Day	45% 5% 13% 21% 15% 2	1673
	21st to end	Day	42% 4 11% 23% 16% 4	1619
March	1st to 10th	Day	42% 4 8% 22% 21% 3	3436
	11th to 20th	Day	33% 6% 13% 27% 19% 3	3480
	21st to end	Day	48% 7% 16% 22% 6% 1	3814
April	1st to 10th	Day	40% 6% 12% 24% 17% 2	2209
	11th to 20th	Day	43% 6% 13% 22% 15% 1	2254
	21st to end	Day	50% 4 11% 23% 10% 1	2388
May	1st to 10th	Day	44% 8% 12% 22% 13% 1	4120
	11th to 20th	Day	43% 8% 13% 22% 14%	4086
	21st to end	Day	37% 8% 12% 30% 12% 1	4649
June	1st to 10th	Day	29% 9% 17% 29% 15% 2	2660
	11th to 20th	Day	32% 7% 15% 29% 15% 2	2660
	21st to end	Day	27% 9% 16% 29% 15% 4	2660
July	1st to 10th	Day	39% 6% 14% 21% 17% 3	4102
	11th to 20th	Day	27% 5% 12% 36% 19% 2	4051
	21st to end	Day	32% 5% 18% 33% 11% 1	4325
August	1st to 10th	Day	28% 6% 15% 29% 21% 1	4090
	11th to 20th	Day	36% 5% 18% 26% 15% 1	4080
	21st to end	Day	26% 4 15% 36% 15% 4	4243
September	1st to 10th	Day	31% 5% 13% 25% 20% 6%	2280
	11th to 20th	Day	31% 5% 13% 25% 24% 2	2133
	21st to end	Day	31% 5% 9% 29% 23% 3	2062
October	1st to 10th	Day	19% 3 7% 23% 39% 10%	3160
	11th to 20th	Day	20% 3 5% 24% 40% 9%	3140
	21st to end	Day	33% 3 9% 25% 26% 3	3428
November	1st to 10th	Day	32% 4 12% 28% 19% 5%	1928
	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	47% 5% 14% 21% 12% 1	4108
	11th to 20th	Night	50% 5% 11% 21% 11% 1	4120
	21st to end	Night	52% 4 13% 19% 11% 1	4532
February	1st to 10th	Night	45% 5% 12% 21% 14% 3	2470
	11th to 20th	Night	42% 5% 12% 21% 18% 3	2404
	21st to end	Night	40% 4 10% 22% 18% 6%	1849
March	1st to 10th	Night	38% 6% 11% 22% 21% 3	3419
	11th to 20th	Night	30% 5% 10% 26% 25% 4	3480
	21st to end	Night	47% 8% 17% 20% 8% 1	3817
April	1st to 10th	Night	35% 5% 11% 24% 21% 4	1971
	11th to 20th	Night	38% 4 9% 28% 17% 4	1875
	21st to end	Night	42% 5% 12% 25% 15% 1	1789
May	1st to 10th	Night	41% 8% 15% 19% 15% 1	2850
	11th to 20th	Night	38% 8% 14% 27% 13% 1	2824
	21st to end	Night	32% 6% 12% 28% 21% 1	2921
June	1st to 10th	Night	24% 7% 19% 31% 16% 3	1520
	11th to 20th	Night	26% 7% 14% 32% 19% 2	1520
	21st to end	Night	20% 5% 14% 34% 22% 4	1520
July	1st to 10th	Night	36% 5% 13% 23% 19% 4	2740
	11th to 20th	Night	21% 3 14% 39% 21% 2	2796
	21st to end	Night	29% 5% 21% 32% 13% 1	2999
August	1st to 10th	Night	17% 5% 22% 29% 23% 5%	2826
	11th to 20th	Night	34% 3 12% 29% 20% 2	2825
	21st to end	Night	25% 3 13% 38% 17% 4	3413
September	1st to 10th	Night	29% 5% 10% 26% 22% 8%	1900
	11th to 20th	Night	28% 6% 10% 27% 24% 5%	2042
	21st to end	Night	29% 4 8% 27% 28% 4	2098
October	1st to 10th	Night	17% 3 6% 21% 44% 9%	3800
	11th to 20th	Night	23% 2 5% 26% 30% 14%	3779
	21st to end	Night	34% 2 7% 30% 25% 3	4120
November	1st to 10th	Night	28% 4 12% 27% 24% 6%	2311
	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	28% 19% 38% 14%	270
	21st to end	Day	17% 18% 46% 15% 4	297
February	1st to 10th	Day	24% 20% 39% 16% 2	270
	11th to 20th	Day	19% 23% 41% 14% 3	270
	21st to end	Day	19% 28% 39% 10% 4	225
March	1st to 10th	Day	19% 19% 44% 16% 2	270
	11th to 20th	Day	30% 12% 37% 18% 3	270
	21st to end	Day	33% 21% 30% 12% 4	297
April	1st to 10th	Day	22% 19% 37% 16% 6%	389
	11th to 20th	Day	21% 17% 36% 20% 5% 1	452
	21st to end	Day	22% 18% 35% 17% 8% 1	568
May	1st to 10th	Day	19% 14% 38% 20% 8% 1	653
	11th to 20th	Day	20% 11% 29% 26% 11% 2	675
	21st to end	Day	17% 7% 30% 27% 15% 4	734
June	1st to 10th	Day	7% 5% 22% 35% 26% 5%	680
	11th to 20th	Day	8% 4 28% 39% 18% 3	680
	21st to end	Day	7% 7% 33% 36% 16% 2	680
July	1st to 10th	Day	13% 2 17% 29% 29% 10%	671
	11th to 20th	Day	4 2 23% 37% 26% 8%	668
	21st to end	Day	7% 3 18% 37% 28% 7%	739
August	1st to 10th	Day	6% 3 20% 39% 28% 4	676
	11th to 20th	Day	10% 3 19% 37% 26% 5%	665
	21st to end	Day	9% 1 17% 33% 31% 10%	577
September	1st to 10th	Day	13% 2 16% 36% 25% 7%	490
	11th to 20th	Day	6% 2 22% 42% 22% 5%	343
	21st to end	Day	11% 7% 29% 33% 14% 6%	300
October	1st to 10th	Day	13% 7% 34% 25% 15% 6%	300
	11th to 20th	Day	12% 19% 39% 21% 8% 1	300
	21st to end	Day	21% 20% 33% 21% 5% 1	330
November	1st to 10th	Day	15% 13% 40% 22% 7% 3	291
	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% 15% 39% 24% 5% 1	950
	21st to end	Night	14% 14% 42% 27% 3	1045
February	1st to 10th	Night	17% 15% 42% 22% 4	950
	11th to 20th	Night	17% 15% 39% 25% 3	929
	21st to end	Night	19% 16% 42% 19% 4	593
March	1st to 10th	Night	16% 13% 42% 24% 5%	570
	11th to 20th	Night	22% 11% 34% 26% 6%	570
	21st to end	Night	26% 13% 35% 22% 3	627
April	1st to 10th	Night	14% 14% 41% 25% 5%	570
	11th to 20th	Night	19% 14% 33% 28% 6%	563
	21st to end	Night	21% 11% 36% 26% 6%	570
May	1st to 10th	Night	17% 9% 36% 30% 7% 1	570
	11th to 20th	Night	16% 7% 28% 35% 13% 1	561
	21st to end	Night	12% 6% 30% 34% 15% 2	617
June	1st to 10th	Night	8% 3 19% 46% 22% 2	570
	11th to 20th	Night	6% 2 27% 45% 19% 1	570
	21st to end	Night	5% 2 32% 46% 14% 1	570
July	1st to 10th	Night	9% 2 13% 43% 30% 3	555
	11th to 20th	Night	3 3 18% 45% 29% 3	552
	21st to end	Night	7% 1 15% 44% 30% 2	624
August	1st to 10th	Night	4 2 15% 47% 32% 1	567
	11th to 20th	Night	8% 2 15% 44% 29% 3	564
	21st to end	Night	6% 1 14% 41% 36% 2	627
September	1st to 10th	Night	11% 2 17% 43% 23% 4	570
	11th to 20th	Night	11% 1 21% 40% 22% 5%	570
	21st to end	Night	9% 4 25% 40% 19% 3	578
October	1st to 10th	Night	11% 6% 28% 36% 18% 2	760
	11th to 20th	Night	15% 9% 39% 30% 7%	760
	21st to end	Night	19% 13% 32% 26% 9%	836
November	1st to 10th	Night	12% 9% 36% 31% 11% 1	771
	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 2024-11-05 07:15:47. Version ac07

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