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 2024-11-10.

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% 46%	101289
	Night	11% 6% 2 5% 3 3 3 3 5% 6% 52%	97960
Transparency	Day	37% 4 10% 24% 20% 5%	104967
	Night	32% 4 10% 23% 23% 8%	102409
Seeing	Day	15% 12% 27% 27% 16% 3	15341
	Night	15% 11% 27% 30% 15% 1	25160

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	12% 12% 4 6% 4 3 3 2 3 6% 46%	2847
	11th to 20th	Day	8% 7% 2 4 3 3 3 3 3 5% 59%	2850
	21st to end	Day	20% 10% 3 5% 3 2 3 2 4 4 45%	3135
February	1st to 10th	Day	19% 11% 3 7% 4 4 3 2 4 4 39%	1710
	11th to 20th	Day	15% 10% 3 7% 4 4 4 3 4 6% 41%	1799
	21st to end	Day	21% 9% 3 6% 3 3 3 2 4 4 42%	1662
March	1st to 10th	Day	17% 9% 2 6% 4 3 3 2 4 5% 46%	3436
	11th to 20th	Day	14% 9% 3 7% 5% 4 3 3 5% 7% 41%	3480
	21st to end	Day	19% 11% 3 7% 4 3 4 3 4 6% 37%	3814
April	1st to 10th	Day	14% 8% 3 7% 4 4 3 2 5% 6% 45%	2109
	11th to 20th	Day	18% 6% 3 5% 4 4 4 3 4 6% 43%	2254
	21st to end	Day	19% 8% 3 6% 4 4 3 3 4 5% 41%	2332
May	1st to 10th	Day	21% 9% 2 6% 4 3 4 3 4 5% 38%	4082
	11th to 20th	Day	13% 7% 2 7% 3 4 4 4 6% 6% 43%	4082
	21st to end	Day	18% 8% 3 8% 5% 4 5% 3 5% 6% 34%	4477
June	1st to 10th	Day	9% 5% 2 6% 4 4 4 4 7% 9% 45%	2470
	11th to 20th	Day	8% 6% 2 6% 5% 5% 5% 4 7% 8% 44%	2470
	21st to end	Day	6% 4 1 4 4 4 4 4 6% 9% 54%	2470
July	1st to 10th	Day	8% 5% 2 5% 4 4 5% 4 8% 9% 46%	4120
	11th to 20th	Day	3 3 2 4 4 4 5% 4 6% 9% 56%	4120
	21st to end	Day	7% 4 2 8% 6% 6% 6% 6% 8% 9% 38%	4465
August	1st to 10th	Day	3 3 2 5% 4 4 4 4 6% 8% 58%	4104
	11th to 20th	Day	8% 4 2 4 4 4 4 5% 7% 10% 50%	4041
	21st to end	Day	4 3 1 5% 4 5% 5% 5% 8% 9% 50%	4194
September	1st to 10th	Day	11% 6% 2 5% 4 4 4 3 5% 6% 49%	2161
	11th to 20th	Day	10% 5% 2 7% 4 4 4 4 6% 8% 47%	2090
	21st to end	Day	9% 4 1 4 3 4 4 4 5% 6% 56%	2090
October	1st to 10th	Day	7% 4 2 6% 3 4 4 4 5% 5% 56%	1947
	11th to 20th	Day	13% 6% 2 4 2 3 3 2 3 4 59%	1900
	21st to end	Day	17% 6% 2 5% 3 3 2 2 3 5% 51%	2090
November	1st to 10th	Day	12% 7% 2 5% 3 3 3 3 5% 7% 50%	1948
	11th to 20th	Day	11% 6% 2 5% 2 3 3 2 4 4 57%	1824
	21st to end	Day	17% 7% 2 4 3 3 3 3 2 5% 51%	1710
December	1st to 10th	Day	16% 7% 2 5% 3 3 3 3 5% 6% 48%	1710
	11th to 20th	Day	16% 9% 3 6% 4 4 3 3 4 6% 43%	2161
	21st to end	Day	17% 12% 2 7% 4 4 3 3 5% 5% 37%	3135
January	1st to 10th	Night	11% 9% 3 7% 4 3 3 3 4 4 48%	4108
	11th to 20th	Night	9% 6% 2 6% 4 3 3 2 3 4 57%	4120
	21st to end	Night	22% 9% 3 5% 2 2 2 2 3 4 46%	4532
February	1st to 10th	Night	15% 9% 2 7% 3 4 4 3 4 5% 45%	2470
	11th to 20th	Night	15% 9% 3 7% 3 3 3 2 4 5% 46%	2285
	21st to end	Night	15% 10% 2 5% 3 2 2 3 4 4 49%	1790
March	1st to 10th	Night	18% 10% 3 6% 3 3 3 3 4 5% 41%	3419
	11th to 20th	Night	14% 9% 2 5% 3 3 3 3 4 5% 49%	3480
	21st to end	Night	13% 9% 3 6% 4 4 3 3 5% 6% 44%	3817
April	1st to 10th	Night	13% 8% 2 5% 4 4 3 3 4 6% 49%	2071
	11th to 20th	Night	14% 7% 2 4 3 3 3 3 5% 6% 49%	1875
	21st to end	Night	15% 6% 2 6% 4 3 3 3 5% 6% 47%	1843
May	1st to 10th	Night	18% 9% 2 6% 4 4 3 3 5% 7% 38%	2823
	11th to 20th	Night	14% 6% 2 6% 3 3 3 4 5% 8% 45%	2823
	21st to end	Night	14% 6% 3 6% 4 5% 4 4 5% 9% 41%	3090
June	1st to 10th	Night	5% 4 2 4 3 4 4 5% 5% 9% 55%	1710
	11th to 20th	Night	5% 4 1 3 4 3 3 4 6% 8% 59%	1710
	21st to end	Night	4 2 1 2 3 3 3 3 6% 10% 63%	1710
July	1st to 10th	Night	8% 4 2 5% 3 3 4 4 6% 8% 53%	2850
	11th to 20th	Night	4 3 1 3 3 2 3 3 5% 8% 66%	2850
	21st to end	Night	4 4 2 5% 4 4 4 5% 7% 9% 51%	3098
August	1st to 10th	Night	2 1 1 2 3 3 4 4 5% 8% 67%	2836
	11th to 20th	Night	4 3 1 4 3 2 3 3 6% 8% 62%	2798
	21st to end	Night	2 3 1 3 3 3 4 3 6% 10% 62%	3462
September	1st to 10th	Night	6% 5% 2 4 3 3 4 3 5% 7% 57%	2015
	11th to 20th	Night	9% 4 2 4 3 4 4 4 6% 7% 52%	2090
	21st to end	Night	7% 4 1 4 3 3 3 2 4 7% 61%	2090
October	1st to 10th	Night	6% 4 1 5% 2 3 3 3 4 7% 62%	2213
	11th to 20th	Night	13% 4 2 4 2 2 2 2 4 5% 60%	2280
	21st to end	Night	18% 5% 2 4 2 2 2 2 3 4 56%	2508
November	1st to 10th	Night	12% 4 2 5% 3 3 3 2 4 6% 56%	2335
	11th to 20th	Night	8% 6% 2 6% 4 3 3 3 3 5% 58%	2351
	21st to end	Night	15% 8% 2 4 2 3 3 3 4 5% 51%	2470
December	1st to 10th	Night	14% 7% 2 5% 2 3 3 2 5% 5% 51%	2470
	11th to 20th	Night	13% 7% 4 7% 5% 3 3 3 3 4 48%	3036
	21st to end	Night	17% 9% 3 6% 3 4 4 2 4 5% 44%	4532

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	42% 2 6% 23% 22% 3	2848
	11th to 20th	Day	29% 3 14% 27% 23% 4	2850
	21st to end	Day	45% 2 6% 18% 23% 5%	3135
February	1st to 10th	Day	49% 4 8% 15% 20% 4	1710
	11th to 20th	Day	45% 4 7% 20% 19% 5%	1809
	21st to end	Day	48% 2 5% 16% 21% 8%	1662
March	1st to 10th	Day	43% 4 8% 15% 20% 11%	3436
	11th to 20th	Day	44% 5% 10% 20% 16% 5%	3480
	21st to end	Day	49% 4 8% 22% 15% 2	3814
April	1st to 10th	Day	42% 4 9% 20% 19% 6%	2109
	11th to 20th	Day	43% 5% 8% 21% 18% 5%	2254
	21st to end	Day	46% 5% 8% 19% 18% 3	2332
May	1st to 10th	Day	48% 5% 9% 20% 15% 2	4120
	11th to 20th	Day	40% 5% 12% 24% 18% 1	4086
	21st to end	Day	51% 6% 12% 16% 13% 3	4489
June	1st to 10th	Day	34% 7% 16% 28% 13% 2	2470
	11th to 20th	Day	35% 7% 13% 24% 18% 2	2470
	21st to end	Day	27% 6% 13% 29% 21% 3	2470
July	1st to 10th	Day	32% 6% 18% 29% 14% 1	4056
	11th to 20th	Day	25% 4 10% 38% 22% 2	4051
	21st to end	Day	39% 5% 14% 30% 13%	4325
August	1st to 10th	Day	23% 5% 13% 27% 26% 6%	4090
	11th to 20th	Day	30% 4 17% 34% 13% 2	4080
	21st to end	Day	29% 5% 15% 36% 14% 2	4193
September	1st to 10th	Day	35% 5% 9% 23% 19% 9%	2161
	11th to 20th	Day	34% 7% 10% 22% 19% 7%	2090
	21st to end	Day	29% 5% 10% 20% 27% 9%	2090
October	1st to 10th	Day	19% 3 6% 11% 34% 27%	3233
	11th to 20th	Day	22% 2 3 17% 38% 19%	3140
	21st to end	Day	31% 2 5% 30% 25% 7%	3428
November	1st to 10th	Day	35% 4 7% 23% 23% 7%	1948
	11th to 20th	Day	30% 3 8% 24% 26% 8%	1824
	21st to end	Day	39% 2 6% 20% 26% 7%	1710
December	1st to 10th	Day	38% 3 9% 25% 19% 5%	1710
	11th to 20th	Day	44% 3 5% 20% 22% 6%	2159
	21st to end	Day	47% 4 7% 20% 19% 4	3135
January	1st to 10th	Night	39% 3 7% 19% 27% 4	4108
	11th to 20th	Night	32% 3 14% 19% 26% 6%	4120
	21st to end	Night	43% 2 7% 18% 23% 6%	4532
February	1st to 10th	Night	43% 4 9% 20% 18% 7%	2470
	11th to 20th	Night	42% 3 5% 21% 22% 6%	2285
	21st to end	Night	39% 3 8% 18% 22% 10%	1790
March	1st to 10th	Night	46% 4 6% 16% 17% 11%	3419
	11th to 20th	Night	38% 5% 8% 25% 15% 9%	3480
	21st to end	Night	42% 4 10% 20% 22% 2	3817
April	1st to 10th	Night	38% 4 9% 19% 19% 11%	2071
	11th to 20th	Night	35% 5% 9% 23% 18% 10%	1875
	21st to end	Night	38% 4 10% 24% 21% 3	1843
May	1st to 10th	Night	46% 6% 10% 18% 15% 6%	2850
	11th to 20th	Night	36% 7% 14% 25% 16% 2	2824
	21st to end	Night	40% 7% 15% 21% 11% 5%	3099
June	1st to 10th	Night	25% 7% 16% 30% 19% 4	1710
	11th to 20th	Night	23% 6% 12% 32% 24% 3	1710
	21st to end	Night	17% 6% 13% 31% 28% 5%	1710
July	1st to 10th	Night	29% 5% 17% 29% 15% 4	2805
	11th to 20th	Night	18% 3 11% 42% 23% 3	2796
	21st to end	Night	27% 4 19% 32% 17% 1	2999
August	1st to 10th	Night	15% 4 13% 28% 33% 7%	2826
	11th to 20th	Night	20% 3 18% 36% 19% 3	2825
	21st to end	Night	20% 5% 15% 38% 21% 2	3462
September	1st to 10th	Night	25% 5% 12% 24% 22% 11%	2015
	11th to 20th	Night	29% 7% 10% 23% 22% 9%	2090
	21st to end	Night	25% 4 7% 23% 29% 11%	2090
October	1st to 10th	Night	14% 3 6% 14% 31% 32%	3694
	11th to 20th	Night	20% 2 4 14% 41% 20%	3779
	21st to end	Night	30% 2 4 30% 24% 11%	4120
November	1st to 10th	Night	30% 4 8% 23% 25% 10%	2335
	11th to 20th	Night	30% 3 8% 21% 26% 11%	2351
	21st to end	Night	37% 3 6% 20% 27% 7%	2470
December	1st to 10th	Night	36% 4 10% 21% 22% 8%	2470
	11th to 20th	Night	42% 3 5% 16% 25% 8%	3037
	21st to end	Night	42% 3 8% 21% 20% 6%	4532

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	23% 22% 35% 16% 4	270
	11th to 20th	Day	25% 26% 36% 10% 3	270
	21st to end	Day	20% 27% 32% 15% 5%	297
February	1st to 10th	Day	34% 17% 34% 11% 3	270
	11th to 20th	Day	31% 25% 33% 9% 1	270
	21st to end	Day	33% 31% 28% 6% 2	225
March	1st to 10th	Day	25% 26% 33% 15% 1	270
	11th to 20th	Day	33% 27% 28% 10% 3	270
	21st to end	Day	28% 26% 36% 8% 3	297
April	1st to 10th	Day	25% 24% 37% 10% 3	289
	11th to 20th	Day	29% 19% 31% 15% 5%	452
	21st to end	Day	24% 21% 32% 15% 5% 1	512
May	1st to 10th	Day	18% 17% 41% 19% 5%	653
	11th to 20th	Day	17% 13% 35% 23% 12% 1	675
	21st to end	Day	13% 12% 36% 21% 15% 3	734
June	1st to 10th	Day	9% 6% 24% 35% 21% 4	680
	11th to 20th	Day	7% 5% 28% 38% 18% 4	680
	21st to end	Day	4 5% 24% 39% 22% 5%	680
July	1st to 10th	Day	9% 4 17% 34% 30% 7%	671
	11th to 20th	Day	2 2 17% 39% 33% 6%	668
	21st to end	Day	5% 1 14% 38% 33% 9%	739
August	1st to 10th	Day	6% 1 13% 43% 33% 4	676
	11th to 20th	Day	9% 3 17% 42% 26% 4	665
	21st to end	Day	5% 1 11% 35% 38% 10%	553
September	1st to 10th	Day	7% 3 13% 34% 36% 7%	371
	11th to 20th	Day	4 3 22% 40% 24% 7%	300
	21st to end	Day	14% 5% 22% 35% 20% 4	300
October	1st to 10th	Day	3 9% 37% 32% 16% 3	300
	11th to 20th	Day	16% 13% 36% 28% 6% 1	300
	21st to end	Day	28% 15% 27% 25% 5%	330
November	1st to 10th	Day	17% 16% 39% 20% 7% 1	297
	11th to 20th	Day	18% 22% 31% 23% 6% 1	270
	21st to end	Day	26% 22% 31% 16% 4 1	270
December	1st to 10th	Day	23% 22% 30% 19% 4 1	270
	11th to 20th	Day	26% 23% 34% 12% 4	270
	21st to end	Day	22% 29% 33% 13% 3	297
January	1st to 10th	Night	18% 16% 33% 26% 6%	950
	11th to 20th	Night	21% 19% 31% 24% 5%	950
	21st to end	Night	18% 17% 31% 28% 5%	1045
February	1st to 10th	Night	23% 20% 32% 22% 3	950
	11th to 20th	Night	23% 21% 31% 23% 2	810
	21st to end	Night	24% 20% 34% 19% 2	534
March	1st to 10th	Night	22% 15% 32% 27% 4	570
	11th to 20th	Night	21% 16% 33% 25% 5%	570
	21st to end	Night	19% 19% 36% 21% 6%	627
April	1st to 10th	Night	17% 20% 34% 24% 5%	570
	11th to 20th	Night	18% 17% 33% 25% 7%	563
	21st to end	Night	18% 16% 35% 22% 8% 1	570
May	1st to 10th	Night	11% 14% 36% 31% 8%	570
	11th to 20th	Night	13% 9% 33% 31% 13% 2	561
	21st to end	Night	11% 7% 31% 30% 19% 2	617
June	1st to 10th	Night	5% 4 20% 40% 29% 3	570
	11th to 20th	Night	6% 3 28% 41% 21% 1	570
	21st to end	Night	3 2 22% 38% 30% 4	570
July	1st to 10th	Night	6% 1 13% 37% 38% 5%	555
	11th to 20th	Night	3 15% 39% 37% 5%	552
	21st to end	Night	3 1 9% 40% 41% 6%	624
August	1st to 10th	Night	2 1 13% 40% 39% 5%	567
	11th to 20th	Night	7% 1 12% 42% 34% 5%	564
	21st to end	Night	4 2 11% 36% 41% 5%	627
September	1st to 10th	Night	8% 1 11% 41% 36% 4	570
	11th to 20th	Night	11% 3 15% 36% 32% 3	570
	21st to end	Night	8% 4 21% 34% 31% 4	570
October	1st to 10th	Night	8% 4 24% 34% 27% 3	693
	11th to 20th	Night	15% 8% 31% 31% 15% 1	760
	21st to end	Night	22% 9% 27% 26% 14% 1	836
November	1st to 10th	Night	13% 10% 36% 31% 10% 1	779
	11th to 20th	Night	14% 16% 30% 30% 10%	831
	21st to end	Night	22% 17% 29% 24% 9%	950
December	1st to 10th	Night	20% 15% 31% 28% 6%	950
	11th to 20th	Night	22% 15% 32% 27% 4	950
	21st to end	Night	21% 19% 30% 24% 6%	1045

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