Kiamichi Skies Observatory
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Kiamichi Skies Observatory clear sky chart from 2005-11-06 to 2025-12-03.

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% 2 6% 4 4 4 3 5% 7% 47%	127152
	Night	11% 6% 2 5% 3 3 3 3 5% 6% 52%	123829
Transparency	Day	37% 4 10% 24% 20% 6%	130791
	Night	33% 3 9% 23% 23% 8%	128253
Seeing	Day	16% 12% 27% 26% 15% 3	16768
	Night	15% 11% 27% 30% 15% 1	26593

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% 11% 4 6% 4 3 2 2 4 5% 46%	4077
	11th to 20th	Day	6% 6% 3 5% 4 3 3 3 4 5% 59%	4080
	21st to end	Day	21% 9% 2 4 2 2 2 2 3 5% 48%	4488
February	1st to 10th	Day	20% 10% 3 7% 4 4 3 2 3 4 40%	1800
	11th to 20th	Day	16% 10% 3 7% 4 4 4 3 4 6% 40%	1897
	21st to end	Day	20% 8% 3 6% 3 3 3 2 4 4 43%	1747
March	1st to 10th	Day	17% 8% 2 6% 3 3 3 2 4 5% 47%	4936
	11th to 20th	Day	10% 7% 2 6% 4 4 3 3 5% 6% 50%	4980
	21st to end	Day	15% 9% 3 7% 4 4 4 3 5% 7% 39%	5462
April	1st to 10th	Day	15% 8% 3 7% 4 4 3 2 4 6% 45%	2220
	11th to 20th	Day	18% 6% 3 5% 4 4 4 3 4 6% 44%	2374
	21st to end	Day	18% 8% 3 7% 4 4 3 3 4 5% 40%	2455
May	1st to 10th	Day	19% 9% 2 7% 4 4 4 3 5% 6% 38%	5862
	11th to 20th	Day	13% 7% 2 7% 4 5% 4 4 7% 7% 41%	5862
	21st to end	Day	17% 8% 3 8% 5% 4 5% 3 5% 6% 35%	6434
June	1st to 10th	Day	10% 5% 2 6% 4 4 4 4 7% 9% 45%	2600
	11th to 20th	Day	9% 6% 2 6% 5% 5% 5% 4 8% 8% 42%	2600
	21st to end	Day	5% 4 1 4 4 4 4 4 6% 9% 54%	2600
July	1st to 10th	Day	7% 5% 2 7% 5% 5% 6% 5% 8% 10% 39%	5900
	11th to 20th	Day	4 4 2 4 4 4 4 3 5% 8% 58%	5900
	21st to end	Day	5% 3 2 6% 5% 5% 5% 5% 7% 9% 49%	6422
August	1st to 10th	Day	3 3 2 5% 4 4 4 4 6% 8% 58%	4234
	11th to 20th	Day	7% 4 2 4 4 4 4 5% 7% 10% 50%	4171
	21st to end	Day	5% 4 1 5% 4 5% 5% 4 8% 9% 50%	4327
September	1st to 10th	Day	10% 6% 2 5% 4 4 5% 3 5% 6% 50%	2274
	11th to 20th	Day	9% 5% 2 6% 4 5% 4 5% 6% 8% 47%	2200
	21st to end	Day	9% 4 2 5% 3 4 4 4 5% 6% 56%	2200
October	1st to 10th	Day	7% 4 2 6% 3 4 4 3 5% 5% 57%	2049
	11th to 20th	Day	13% 5% 1 5% 2 3 3 2 3 4 60%	2000
	21st to end	Day	18% 6% 2 5% 3 3 2 2 3 5% 51%	2200
November	1st to 10th	Day	11% 7% 2 5% 3 3 3 2 4 7% 52%	2058
	11th to 20th	Day	11% 6% 2 5% 2 3 3 2 4 5% 58%	2016
	21st to end	Day	16% 7% 2 4 3 3 3 3 3 5% 51%	1890
December	1st to 10th	Day	16% 8% 2 4 2 2 3 2 5% 5% 50%	2958
	11th to 20th	Day	18% 9% 3 5% 3 3 3 2 4 6% 44%	3391
	21st to end	Day	19% 11% 3 7% 4 3 3 3 4 5% 39%	4488
January	1st to 10th	Night	14% 7% 3 9% 4 3 3 3 4 5% 48%	5888
	11th to 20th	Night	7% 5% 2 5% 3 3 3 2 4 5% 61%	5900
	21st to end	Night	21% 9% 3 4 2 2 2 2 3 4 46%	6490
February	1st to 10th	Night	16% 9% 2 7% 3 3 4 3 4 5% 45%	2600
	11th to 20th	Night	16% 9% 3 7% 4 3 3 2 4 5% 44%	2408
	21st to end	Night	15% 9% 3 5% 3 3 2 2 4 4 50%	1881
March	1st to 10th	Night	18% 9% 3 6% 3 3 3 3 4 5% 45%	4919
	11th to 20th	Night	10% 7% 2 5% 3 3 3 3 4 5% 55%	4980
	21st to end	Night	13% 8% 3 6% 4 4 3 3 5% 6% 45%	5467
April	1st to 10th	Night	13% 8% 2 5% 4 3 3 3 4 6% 49%	2180
	11th to 20th	Night	14% 7% 2 4 3 3 3 3 5% 6% 50%	1975
	21st to end	Night	14% 6% 2 6% 4 3 3 3 5% 7% 46%	1940
May	1st to 10th	Night	18% 9% 2 6% 4 3 3 3 5% 7% 39%	4053
	11th to 20th	Night	11% 6% 2 6% 3 4 4 4 6% 9% 45%	4053
	21st to end	Night	14% 7% 3 6% 4 4 4 3 5% 8% 42%	4443
June	1st to 10th	Night	5% 4 2 4 3 4 4 5% 6% 9% 54%	1800
	11th to 20th	Night	5% 5% 1 3 4 3 3 4 6% 9% 57%	1800
	21st to end	Night	4 2 1 2 3 3 3 3 6% 10% 64%	1800
July	1st to 10th	Night	6% 5% 2 6% 4 4 5% 4 8% 10% 46%	4078
	11th to 20th	Night	4 3 1 3 3 3 3 3 4 7% 66%	4077
	21st to end	Night	3 3 2 4 3 3 4 4 7% 10% 58%	4449
August	1st to 10th	Night	2 1 1 2 2 3 4 4 5% 8% 67%	2926
	11th to 20th	Night	4 3 1 4 3 2 3 3 6% 8% 63%	2888
	21st to end	Night	3 3 1 3 4 3 4 4 6% 10% 61%	3571
September	1st to 10th	Night	6% 5% 2 4 3 3 4 3 5% 7% 57%	2121
	11th to 20th	Night	9% 4 2 4 4 4 4 5% 6% 7% 51%	2200
	21st to end	Night	7% 4 1 5% 3 3 4 3 5% 7% 59%	2200
October	1st to 10th	Night	6% 3 1 4 2 3 3 3 4 7% 63%	2330
	11th to 20th	Night	12% 4 2 4 2 2 2 2 4 5% 61%	2400
	21st to end	Night	18% 5% 2 4 3 3 2 2 3 4 55%	2640
November	1st to 10th	Night	11% 4 2 5% 3 3 3 2 4 6% 57%	2460
	11th to 20th	Night	8% 6% 2 5% 4 3 3 2 4 5% 58%	2599
	21st to end	Night	15% 8% 2 4 2 3 3 3 4 5% 52%	2730
December	1st to 10th	Night	11% 9% 3 6% 3 3 3 2 4 4 51%	4277
	11th to 20th	Night	15% 8% 4 7% 4 3 3 2 3 3 49%	4816
	21st to end	Night	17% 11% 3 6% 3 4 3 2 4 4 43%	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	43% 2 9% 24% 19% 2	4078
	11th to 20th	Day	29% 2 10% 24% 31% 4	4080
	21st to end	Day	42% 2 4 19% 26% 7%	4488
February	1st to 10th	Day	49% 3 8% 15% 21% 4	1800
	11th to 20th	Day	46% 4 7% 20% 18% 5%	1907
	21st to end	Day	46% 2 5% 16% 22% 9%	1747
March	1st to 10th	Day	42% 3 6% 15% 18% 17%	4936
	11th to 20th	Day	36% 4 7% 16% 18% 18%	4980
	21st to end	Day	46% 3 9% 25% 15% 1	5464
April	1st to 10th	Day	42% 4 9% 20% 19% 6%	2220
	11th to 20th	Day	43% 4 8% 21% 19% 5%	2374
	21st to end	Day	47% 5% 8% 19% 17% 3	2455
May	1st to 10th	Day	48% 4 9% 23% 14% 2	5900
	11th to 20th	Day	41% 4 13% 22% 17% 3	5866
	21st to end	Day	49% 4 11% 17% 14% 4	6447
June	1st to 10th	Day	34% 7% 15% 27% 14% 2	2600
	11th to 20th	Day	37% 7% 13% 24% 18% 2	2600
	21st to end	Day	27% 6% 14% 29% 21% 3	2600
July	1st to 10th	Day	38% 5% 18% 28% 11% 1	5836
	11th to 20th	Day	25% 3 13% 38% 20% 1	5831
	21st to end	Day	31% 4 14% 36% 15%	6240
August	1st to 10th	Day	23% 4 13% 28% 25% 6%	4220
	11th to 20th	Day	29% 4 18% 35% 13% 2	4210
	21st to end	Day	30% 5% 15% 35% 14% 2	4326
September	1st to 10th	Day	35% 5% 8% 24% 19% 9%	2274
	11th to 20th	Day	34% 7% 11% 24% 18% 7%	2200
	21st to end	Day	30% 4 10% 21% 26% 9%	2200
October	1st to 10th	Day	18% 3 6% 11% 35% 27%	3335
	11th to 20th	Day	22% 2 3 18% 37% 18%	3240
	21st to end	Day	32% 2 5% 29% 25% 7%	3538
November	1st to 10th	Day	34% 4 7% 24% 24% 7%	2058
	11th to 20th	Day	30% 3 8% 26% 25% 9%	2016
	21st to end	Day	38% 2 6% 21% 26% 6%	1890
December	1st to 10th	Day	38% 2 7% 32% 17% 3	2958
	11th to 20th	Day	43% 2 4 21% 25% 5%	3389
	21st to end	Day	48% 3 6% 22% 18% 4	4488
January	1st to 10th	Night	40% 2 8% 26% 21% 3	5888
	11th to 20th	Night	27% 3 10% 18% 32% 10%	5900
	21st to end	Night	43% 2 6% 15% 26% 7%	6490
February	1st to 10th	Night	43% 4 8% 21% 19% 6%	2600
	11th to 20th	Night	45% 3 5% 21% 21% 6%	2408
	21st to end	Night	39% 3 7% 18% 22% 11%	1881
March	1st to 10th	Night	44% 3 4 14% 20% 14%	4919
	11th to 20th	Night	32% 3 6% 21% 17% 21%	4980
	21st to end	Night	40% 3 11% 21% 22% 3	5467
April	1st to 10th	Night	38% 4 9% 19% 19% 11%	2180
	11th to 20th	Night	35% 4 8% 23% 19% 10%	1975
	21st to end	Night	38% 4 10% 25% 21% 2	1940
May	1st to 10th	Night	45% 4 11% 22% 13% 4	4080
	11th to 20th	Night	36% 5% 14% 23% 19% 3	4054
	21st to end	Night	40% 5% 15% 20% 14% 6%	4452
June	1st to 10th	Night	26% 7% 16% 30% 19% 4	1800
	11th to 20th	Night	24% 6% 13% 31% 23% 3	1800
	21st to end	Night	17% 6% 14% 31% 28% 5%	1800
July	1st to 10th	Night	33% 5% 19% 28% 13% 3	4035
	11th to 20th	Night	20% 3 13% 38% 25% 2	4026
	21st to end	Night	21% 4 18% 37% 19% 1	4320
August	1st to 10th	Night	15% 4 13% 29% 32% 7%	2916
	11th to 20th	Night	21% 3 18% 37% 19% 3	2915
	21st to end	Night	21% 5% 15% 37% 20% 2	3571
September	1st to 10th	Night	25% 5% 12% 25% 23% 10%	2121
	11th to 20th	Night	29% 7% 10% 25% 21% 8%	2200
	21st to end	Night	26% 4 8% 23% 29% 11%	2200
October	1st to 10th	Night	14% 2 6% 14% 32% 32%	3811
	11th to 20th	Night	20% 2 4 15% 41% 20%	3899
	21st to end	Night	31% 2 4 30% 24% 11%	4252
November	1st to 10th	Night	30% 3 8% 22% 26% 11%	2460
	11th to 20th	Night	30% 3 7% 22% 26% 12%	2599
	21st to end	Night	36% 3 7% 21% 26% 7%	2730
December	1st to 10th	Night	38% 2 6% 27% 22% 5%	4277
	11th to 20th	Night	43% 2 4 18% 24% 10%	4817
	21st to end	Night	45% 2 8% 21% 19% 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	24% 24% 33% 15% 4	300
	11th to 20th	Day	24% 26% 36% 10% 3	300
	21st to end	Day	22% 26% 32% 15% 5%	330
February	1st to 10th	Day	35% 18% 33% 10% 3	300
	11th to 20th	Day	33% 26% 31% 8% 1	300
	21st to end	Day	31% 29% 29% 8% 3	249
March	1st to 10th	Day	28% 25% 32% 14% 2	300
	11th to 20th	Day	33% 28% 28% 9% 3	300
	21st to end	Day	28% 26% 36% 8% 3	330
April	1st to 10th	Day	27% 23% 36% 10% 3 1	320
	11th to 20th	Day	29% 20% 32% 14% 5%	492
	21st to end	Day	24% 21% 32% 16% 5% 1	555
May	1st to 10th	Day	18% 17% 41% 19% 5%	703
	11th to 20th	Day	18% 14% 35% 22% 11% 1	725
	21st to end	Day	14% 12% 36% 21% 14% 3	789
June	1st to 10th	Day	10% 7% 25% 34% 19% 4	730
	11th to 20th	Day	9% 6% 27% 37% 17% 3	730
	21st to end	Day	4 5% 25% 40% 22% 5%	730
July	1st to 10th	Day	9% 4 17% 35% 29% 6%	721
	11th to 20th	Day	3 2 17% 39% 32% 6%	718
	21st to end	Day	5% 1 15% 38% 32% 9%	794
August	1st to 10th	Day	7% 1 13% 44% 32% 3	726
	11th to 20th	Day	9% 3 16% 42% 27% 4	715
	21st to end	Day	8% 1 11% 34% 36% 10%	598
September	1st to 10th	Day	7% 3 14% 36% 34% 6%	404
	11th to 20th	Day	4 3 21% 41% 24% 8%	330
	21st to end	Day	14% 6% 23% 34% 20% 4	330
October	1st to 10th	Day	3 8% 35% 35% 16% 4	330
	11th to 20th	Day	15% 13% 38% 27% 7% 1	330
	21st to end	Day	29% 15% 27% 24% 5%	363
November	1st to 10th	Day	17% 16% 38% 20% 8% 1	330
	11th to 20th	Day	19% 20% 32% 23% 5% 1	330
	21st to end	Day	26% 21% 33% 16% 4 1	330
December	1st to 10th	Day	25% 20% 30% 19% 4 1	306
	11th to 20th	Day	27% 23% 34% 12% 4	300
	21st to end	Day	25% 28% 33% 12% 2	330
January	1st to 10th	Night	19% 16% 33% 26% 5%	1000
	11th to 20th	Night	21% 19% 31% 24% 4	1000
	21st to end	Night	19% 17% 32% 28% 5%	1100
February	1st to 10th	Night	23% 20% 32% 21% 4	1000
	11th to 20th	Night	25% 20% 30% 22% 2	853
	21st to end	Night	23% 20% 34% 21% 2	561
March	1st to 10th	Night	24% 14% 31% 27% 4	600
	11th to 20th	Night	22% 17% 33% 24% 4	600
	21st to end	Night	20% 19% 35% 21% 5%	660
April	1st to 10th	Night	19% 19% 33% 25% 5%	600
	11th to 20th	Night	19% 17% 33% 24% 7%	593
	21st to end	Night	17% 16% 34% 24% 8% 1	600
May	1st to 10th	Night	12% 13% 35% 32% 8%	600
	11th to 20th	Night	13% 10% 32% 31% 13% 2	591
	21st to end	Night	11% 7% 32% 30% 19% 2	650
June	1st to 10th	Night	7% 4 19% 40% 28% 3	600
	11th to 20th	Night	7% 3 27% 41% 22% 1	600
	21st to end	Night	3 3 22% 38% 30% 4	600
July	1st to 10th	Night	6% 1 12% 36% 38% 5%	585
	11th to 20th	Night	4 1 15% 40% 36% 5%	582
	21st to end	Night	3 1 10% 39% 40% 6%	657
August	1st to 10th	Night	3 1 12% 41% 39% 5%	597
	11th to 20th	Night	7% 1 11% 41% 36% 5%	594
	21st to end	Night	5% 2 11% 36% 40% 5%	660
September	1st to 10th	Night	9% 1 10% 41% 35% 4	600
	11th to 20th	Night	11% 3 14% 35% 34% 4	600
	21st to end	Night	8% 4 21% 33% 31% 4	600
October	1st to 10th	Night	7% 4 23% 36% 26% 3	730
	11th to 20th	Night	14% 8% 30% 31% 16% 1	800
	21st to end	Night	23% 9% 27% 26% 14% 1	880
November	1st to 10th	Night	14% 10% 35% 31% 10% 1	820
	11th to 20th	Night	14% 16% 31% 30% 9%	919
	21st to end	Night	22% 16% 29% 24% 9%	1050
December	1st to 10th	Night	20% 15% 31% 28% 5%	1011
	11th to 20th	Night	22% 14% 32% 27% 4	1000
	21st to end	Night	21% 19% 30% 24% 6%	1100

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