KS Oil Patch Observatory
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the KS Oil Patch Observatory 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	8% 5% 2 5% 3 3 4 3 5% 7% 54%	126880
	Night	8% 5% 2 5% 3 3 3 3 5% 7% 57%	123776
Transparency	Day	29% 6% 11% 26% 23% 6%	130599
	Night	26% 5% 11% 26% 24% 7%	128121
Seeing	Day	11% 9% 29% 31% 18% 4	16945
	Night	10% 9% 34% 35% 11% 1	26799

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% 6% 2 6% 4 5% 4 4 5% 6% 47%	4077
	11th to 20th	Day	5% 6% 3 8% 3 3 4 4 5% 7% 52%	4080
	21st to end	Day	9% 7% 2 7% 4 3 3 2 3 5% 54%	4488
February	1st to 10th	Day	8% 10% 3 7% 5% 3 3 3 4 7% 47%	1875
	11th to 20th	Day	6% 6% 3 6% 5% 4 3 3 5% 6% 54%	1949
	21st to end	Day	6% 6% 2 4 3 3 4 4 5% 7% 56%	1650
March	1st to 10th	Day	6% 7% 2 5% 4 3 3 3 4 5% 59%	4713
	11th to 20th	Day	6% 5% 1 3 3 3 3 3 5% 8% 59%	4980
	21st to end	Day	6% 5% 2 6% 5% 4 4 4 7% 9% 48%	5462
April	1st to 10th	Day	10% 4 2 5% 3 3 4 4 5% 7% 53%	2205
	11th to 20th	Day	12% 7% 2 5% 4 4 4 3 5% 6% 48%	2467
	21st to end	Day	16% 6% 2 4 4 4 4 3 5% 6% 47%	2600
May	1st to 10th	Day	16% 7% 2 6% 4 4 3 4 4 6% 45%	5862
	11th to 20th	Day	9% 4 2 4 3 3 3 3 5% 6% 58%	5862
	21st to end	Day	18% 6% 2 6% 4 4 3 3 5% 5% 43%	6434
June	1st to 10th	Day	5% 3 2 6% 3 4 4 4 5% 10% 54%	2600
	11th to 20th	Day	6% 4 1 4 4 4 5% 4 7% 8% 55%	2600
	21st to end	Day	6% 4 1 4 3 4 4 4 6% 8% 56%	2600
July	1st to 10th	Day	7% 4 2 6% 4 4 5% 4 7% 9% 50%	5900
	11th to 20th	Day	7% 4 2 5% 3 4 4 3 5% 9% 55%	5900
	21st to end	Day	5% 3 1 4 4 4 4 4 6% 9% 56%	6422
August	1st to 10th	Day	7% 4 2 5% 4 4 4 4 6% 8% 52%	4234
	11th to 20th	Day	7% 3 1 4 3 3 3 4 6% 9% 56%	4171
	21st to end	Day	4 3 1 4 3 3 3 4 5% 9% 60%	4429
September	1st to 10th	Day	9% 4 1 4 3 3 4 4 5% 6% 56%	2210
	11th to 20th	Day	9% 5% 2 5% 3 3 4 3 5% 7% 54%	2200
	21st to end	Day	7% 4 2 4 3 4 4 2 4 7% 60%	2200
October	1st to 10th	Day	11% 3 2 4 3 2 2 2 4 6% 61%	2183
	11th to 20th	Day	9% 4 1 2 2 3 2 3 4 5% 65%	2000
	21st to end	Day	11% 5% 2 5% 2 2 3 3 3 4 60%	2192
November	1st to 10th	Day	7% 3 1 4 3 2 3 3 5% 6% 64%	1853
	11th to 20th	Day	7% 4 2 4 3 2 3 3 3 6% 62%	1863
	21st to end	Day	9% 5% 1 3 3 2 3 3 3 6% 62%	1800
December	1st to 10th	Day	5% 3 2 4 3 2 2 2 3 5% 70%	2940
	11th to 20th	Day	6% 5% 2 5% 2 3 3 2 4 6% 63%	3391
	21st to end	Day	12% 8% 4 8% 5% 4 4 3 4 7% 41%	4488
January	1st to 10th	Night	10% 6% 2 6% 4 4 5% 3 5% 6% 49%	5888
	11th to 20th	Night	3 4 2 5% 4 4 4 3 6% 6% 60%	5900
	21st to end	Night	12% 8% 2 6% 2 3 3 2 3 4 56%	6490
February	1st to 10th	Night	9% 8% 3 6% 4 3 4 3 5% 6% 49%	2540
	11th to 20th	Night	9% 8% 3 6% 3 3 4 3 5% 6% 51%	2338
	21st to end	Night	7% 6% 3 5% 3 3 3 2 5% 6% 58%	1980
March	1st to 10th	Night	5% 5% 2 5% 2 3 3 3 4 5% 64%	5149
	11th to 20th	Night	5% 4 1 4 3 3 4 3 5% 7% 61%	4980
	21st to end	Night	6% 6% 2 5% 4 4 4 4 5% 6% 54%	5467
April	1st to 10th	Night	9% 5% 1 3 3 4 4 3 5% 7% 55%	2191
	11th to 20th	Night	12% 5% 2 4 4 3 3 3 5% 7% 51%	1881
	21st to end	Night	13% 5% 2 5% 4 3 4 3 5% 7% 50%	1800
May	1st to 10th	Night	16% 6% 2 4 3 3 3 3 5% 6% 49%	4053
	11th to 20th	Night	8% 4 1 4 3 3 3 3 5% 7% 59%	4053
	21st to end	Night	16% 5% 2 3 2 3 4 3 5% 7% 50%	4443
June	1st to 10th	Night	6% 3 1 4 3 3 5% 5% 7% 10% 54%	1800
	11th to 20th	Night	5% 3 1 4 3 3 4 4 7% 10% 56%	1800
	21st to end	Night	5% 3 1 3 3 4 2 4 6% 10% 59%	1800
July	1st to 10th	Night	4 3 2 5% 3 3 5% 4 7% 11% 52%	4078
	11th to 20th	Night	4 3 1 5% 4 4 4 4 6% 11% 55%	4077
	21st to end	Night	4 4 2 6% 4 4 4 4 6% 9% 54%	4449
August	1st to 10th	Night	5% 3 2 5% 4 3 4 4 6% 9% 55%	2926
	11th to 20th	Night	5% 4 2 5% 4 4 4 3 6% 8% 55%	2888
	21st to end	Night	4 2 1 3 3 3 3 3 5% 9% 63%	3462
September	1st to 10th	Night	7% 5% 2 5% 3 3 3 3 4 6% 61%	2190
	11th to 20th	Night	7% 5% 2 5% 4 5% 4 3 5% 7% 54%	2200
	21st to end	Night	6% 4 2 5% 3 3 3 3 5% 6% 62%	2200
October	1st to 10th	Night	9% 4 2 4 3 3 3 3 5% 6% 60%	2200
	11th to 20th	Night	8% 3 1 3 2 2 2 2 3 4 69%	2395
	21st to end	Night	10% 4 2 4 2 2 2 2 3 4 64%	2645
November	1st to 10th	Night	8% 4 2 3 3 2 2 2 4 6% 65%	2665
	11th to 20th	Night	7% 4 1 3 3 3 3 3 4 5% 64%	2692
	21st to end	Night	10% 5% 1 3 2 2 2 3 4 6% 60%	2600
December	1st to 10th	Night	4 4 1 2 3 2 3 3 4 6% 69%	4250
	11th to 20th	Night	6% 4 2 5% 3 3 3 2 4 5% 63%	4816
	21st to end	Night	13% 7% 3 6% 4 3 3 3 4 6% 49%	6490

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	35% 7% 12% 23% 19% 4	4078
	11th to 20th	Day	29% 6% 13% 22% 23% 6%	4080
	21st to end	Day	35% 3 8% 23% 28% 3	4488
February	1st to 10th	Day	39% 4 11% 24% 17% 5%	1875
	11th to 20th	Day	31% 5% 15% 25% 19% 6%	1959
	21st to end	Day	28% 5% 9% 24% 24% 10%	1650
March	1st to 10th	Day	29% 3 7% 17% 25% 19%	4713
	11th to 20th	Day	23% 5% 11% 16% 30% 15%	4980
	21st to end	Day	30% 8% 13% 33% 15% 2	5464
April	1st to 10th	Day	30% 4 13% 24% 22% 7%	2205
	11th to 20th	Day	35% 6% 10% 25% 18% 6%	2467
	21st to end	Day	37% 7% 12% 28% 15% 2	2600
May	1st to 10th	Day	40% 7% 11% 19% 19% 4	5900
	11th to 20th	Day	26% 6% 10% 22% 26% 10%	5866
	21st to end	Day	42% 7% 9% 19% 19% 5%	6447
June	1st to 10th	Day	25% 8% 19% 29% 15% 4	2600
	11th to 20th	Day	25% 8% 13% 27% 21% 6%	2600
	21st to end	Day	23% 8% 15% 25% 23% 7%	2600
July	1st to 10th	Day	29% 6% 12% 24% 24% 5%	5836
	11th to 20th	Day	26% 6% 12% 32% 22% 3	5831
	21st to end	Day	23% 7% 13% 36% 20% 2	6240
August	1st to 10th	Day	28% 8% 12% 28% 21% 3	4220
	11th to 20th	Day	25% 6% 18% 27% 20% 4	4210
	21st to end	Day	21% 6% 14% 34% 20% 5%	4428
September	1st to 10th	Day	28% 6% 11% 25% 20% 10%	2210
	11th to 20th	Day	30% 5% 9% 28% 24% 5%	2200
	21st to end	Day	25% 5% 11% 26% 24% 9%	2200
October	1st to 10th	Day	17% 3 6% 20% 43% 12%	3560
	11th to 20th	Day	18% 4 8% 23% 36% 11%	3240
	21st to end	Day	24% 3 8% 24% 30% 10%	3519
November	1st to 10th	Day	21% 5% 9% 27% 30% 9%	1853
	11th to 20th	Day	25% 4 8% 27% 28% 8%	1863
	21st to end	Day	26% 4 9% 28% 27% 7%	1800
December	1st to 10th	Day	19% 3 8% 42% 26% 2	2940
	11th to 20th	Day	24% 4 6% 33% 28% 4	3389
	21st to end	Day	42% 5% 8% 28% 14% 3	4488
January	1st to 10th	Night	34% 6% 12% 29% 17% 3	5888
	11th to 20th	Night	23% 6% 13% 22% 30% 7%	5900
	21st to end	Night	34% 3 7% 20% 30% 6%	6490
February	1st to 10th	Night	35% 5% 13% 23% 19% 6%	2540
	11th to 20th	Night	34% 6% 11% 25% 20% 6%	2338
	21st to end	Night	28% 4 8% 22% 25% 13%	1980
March	1st to 10th	Night	22% 5% 7% 20% 29% 17%	5149
	11th to 20th	Night	21% 5% 9% 19% 28% 18%	4980
	21st to end	Night	29% 6% 13% 36% 13% 3	5467
April	1st to 10th	Night	27% 6% 10% 24% 24% 9%	2191
	11th to 20th	Night	32% 5% 13% 23% 20% 6%	1881
	21st to end	Night	34% 7% 12% 22% 22% 3	1800
May	1st to 10th	Night	36% 7% 13% 18% 20% 6%	4080
	11th to 20th	Night	24% 7% 13% 25% 20% 10%	4054
	21st to end	Night	33% 7% 14% 22% 20% 4	4452
June	1st to 10th	Night	23% 9% 19% 29% 17% 4	1800
	11th to 20th	Night	23% 6% 16% 29% 21% 5%	1800
	21st to end	Night	19% 7% 14% 31% 21% 8%	1800
July	1st to 10th	Night	23% 7% 19% 27% 21% 3	4035
	11th to 20th	Night	24% 5% 11% 31% 26% 4	4026
	21st to end	Night	26% 6% 14% 33% 20% 1	4320
August	1st to 10th	Night	24% 6% 13% 28% 22% 6%	2916
	11th to 20th	Night	26% 7% 16% 26% 20% 5%	2915
	21st to end	Night	19% 6% 15% 37% 19% 5%	3462
September	1st to 10th	Night	26% 4 11% 23% 25% 11%	2190
	11th to 20th	Night	29% 6% 10% 24% 27% 5%	2200
	21st to end	Night	23% 5% 10% 23% 30% 9%	2200
October	1st to 10th	Night	17% 3 6% 16% 45% 14%	3590
	11th to 20th	Night	15% 2 7% 26% 34% 15%	3894
	21st to end	Night	19% 2 7% 24% 39% 9%	4269
November	1st to 10th	Night	23% 3 10% 25% 29% 10%	2665
	11th to 20th	Night	22% 4 8% 28% 30% 8%	2692
	21st to end	Night	26% 3 8% 26% 27% 9%	2600
December	1st to 10th	Night	18% 4 10% 42% 23% 3	4250
	11th to 20th	Night	24% 4 6% 32% 27% 8%	4817
	21st to end	Night	36% 5% 10% 30% 14% 5%	6490

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	11% 13% 39% 25% 10% 1	300
	11th to 20th	Day	16% 15% 38% 25% 6%	300
	21st to end	Day	9% 12% 43% 29% 5%	330
February	1st to 10th	Day	16% 16% 41% 22% 3 1	300
	11th to 20th	Day	15% 17% 44% 17% 7%	300
	21st to end	Day	7% 18% 48% 20% 6%	249
March	1st to 10th	Day	9% 19% 41% 25% 6%	300
	11th to 20th	Day	14% 18% 38% 22% 6% 2	300
	21st to end	Day	17% 16% 45% 17% 5% 1	330
April	1st to 10th	Day	16% 15% 39% 24% 6%	305
	11th to 20th	Day	15% 16% 43% 23% 3	585
	21st to end	Day	20% 16% 35% 20% 8% 2	700
May	1st to 10th	Day	15% 11% 35% 29% 10% 1	703
	11th to 20th	Day	14% 9% 31% 28% 15% 3	725
	21st to end	Day	16% 8% 30% 30% 14% 3	789
June	1st to 10th	Day	6% 5% 24% 35% 24% 6%	730
	11th to 20th	Day	6% 4 29% 38% 21% 2	730
	21st to end	Day	5% 4 27% 43% 18% 2	730
July	1st to 10th	Day	7% 2 13% 36% 33% 8%	721
	11th to 20th	Day	4 2 13% 40% 32% 8%	718
	21st to end	Day	7% 2 13% 37% 33% 8%	794
August	1st to 10th	Day	7% 2 17% 40% 29% 4	726
	11th to 20th	Day	7% 3 13% 40% 32% 5%	715
	21st to end	Day	6% 3 13% 37% 33% 8%	661
September	1st to 10th	Day	9% 2 11% 34% 35% 8%	340
	11th to 20th	Day	4 4 20% 45% 22% 6%	330
	21st to end	Day	12% 5% 24% 31% 22% 7%	330
October	1st to 10th	Day	12% 8% 28% 26% 22% 4	330
	11th to 20th	Day	8% 9% 38% 32% 11% 2	330
	21st to end	Day	19% 12% 33% 21% 11% 4	363
November	1st to 10th	Day	11% 10% 35% 30% 11% 3	330
	11th to 20th	Day	13% 13% 38% 21% 12% 2	321
	21st to end	Day	17% 11% 36% 24% 9% 3	300
December	1st to 10th	Day	7% 10% 42% 30% 11% 1	300
	11th to 20th	Day	11% 11% 39% 30% 9%	300
	21st to end	Day	15% 19% 39% 24% 3	330
January	1st to 10th	Night	8% 11% 40% 34% 7%	1000
	11th to 20th	Night	9% 13% 40% 31% 8%	1000
	21st to end	Night	10% 11% 41% 31% 6%	1100
February	1st to 10th	Night	12% 13% 41% 30% 5%	940
	11th to 20th	Night	14% 14% 38% 29% 5%	784
	21st to end	Night	10% 15% 39% 32% 4	660
March	1st to 10th	Night	9% 14% 40% 32% 4	705
	11th to 20th	Night	14% 13% 37% 31% 5% 1	600
	21st to end	Night	13% 13% 43% 27% 4	660
April	1st to 10th	Night	13% 14% 42% 25% 7%	600
	11th to 20th	Night	15% 14% 41% 24% 5%	593
	21st to end	Night	15% 14% 38% 25% 7% 1	600
May	1st to 10th	Night	17% 9% 36% 30% 9%	600
	11th to 20th	Night	11% 9% 31% 33% 15% 1	591
	21st to end	Night	12% 8% 32% 33% 14% 2	650
June	1st to 10th	Night	6% 6% 28% 41% 18% 1	600
	11th to 20th	Night	6% 4 37% 41% 12%	600
	21st to end	Night	5% 4 37% 43% 12% 1	600
July	1st to 10th	Night	5% 2 19% 50% 23% 2	585
	11th to 20th	Night	4 2 16% 54% 21% 2	582
	21st to end	Night	6% 2 14% 48% 27% 2	657
August	1st to 10th	Night	5% 2 19% 49% 25% 1	597
	11th to 20th	Night	7% 3 18% 49% 23%	594
	21st to end	Night	5% 1 17% 45% 30% 2	660
September	1st to 10th	Night	8% 3 23% 45% 21% 2	600
	11th to 20th	Night	8% 2 31% 39% 19% 1	600
	21st to end	Night	8% 5% 28% 40% 19% 2	600
October	1st to 10th	Night	9% 7% 29% 36% 19% 1	600
	11th to 20th	Night	10% 7% 41% 35% 7%	795
	21st to end	Night	13% 10% 35% 30% 12%	885
November	1st to 10th	Night	10% 6% 38% 34% 12% 1	1025
	11th to 20th	Night	8% 10% 40% 32% 9%	1036
	21st to end	Night	13% 11% 32% 37% 8%	1000
December	1st to 10th	Night	10% 9% 36% 37% 8% 1	1000
	11th to 20th	Night	14% 11% 39% 32% 5%	1000
	21st to end	Night	13% 12% 38% 32% 5%	1100

Page generated at 2025-11-14 23:55:57. Version ac07

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