Ponca City
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Ponca City clear sky chart from 2005-11-06 to 2024-07-02.

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% 6% 2 5% 4 4 4 3 5% 7% 50%	89726
	Night	11% 5% 2 5% 3 3 3 3 5% 7% 54%	89503
Transparency	Day	33% 6% 11% 25% 20% 5%	89501
	Night	30% 5% 11% 26% 22% 6%	89333
Seeing	Day	12% 9% 28% 30% 18% 4	14997
	Night	12% 8% 32% 35% 12% 1	24925

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% 7% 4 8% 4 4 4 3 5% 6% 46%	2847
	11th to 20th	Day	9% 6% 2 6% 6% 4 4 3 5% 7% 49%	2850
	21st to end	Day	16% 11% 4 5% 3 2 2 2 3 4 46%	3135
February	1st to 10th	Day	13% 10% 3 7% 4 3 2 3 4 6% 45%	1724
	11th to 20th	Day	11% 6% 3 6% 4 3 3 3 5% 6% 51%	1849
	21st to end	Day	11% 9% 3 5% 4 3 3 4 5% 6% 49%	1570
March	1st to 10th	Day	11% 7% 2 5% 2 3 2 2 3 6% 57%	3393
	11th to 20th	Day	11% 5% 1 4 3 3 3 3 5% 7% 55%	3480
	21st to end	Day	14% 9% 2 8% 4 4 5% 4 5% 6% 39%	3814
April	1st to 10th	Day	10% 6% 2 5% 4 4 3 3 5% 6% 51%	2090
	11th to 20th	Day	13% 5% 2 6% 5% 4 4 4 5% 7% 45%	2285
	21st to end	Day	16% 6% 3 6% 4 4 3 3 5% 6% 43%	2470
May	1st to 10th	Day	20% 7% 2 7% 4 4 4 3 4 5% 41%	4082
	11th to 20th	Day	10% 5% 3 5% 4 4 4 4 6% 7% 47%	4082
	21st to end	Day	13% 6% 3 7% 5% 4 4 4 5% 6% 44%	4477
June	1st to 10th	Day	5% 3 3 5% 4 4 5% 4 6% 10% 52%	2470
	11th to 20th	Day	7% 4 2 5% 4 3 4 4 6% 8% 53%	2470
	21st to end	Day	6% 2 1 4 3 4 4 3 6% 9% 59%	2470
July	1st to 10th	Day	9% 5% 1 4 4 4 5% 5% 6% 11% 47%	2354
	11th to 20th	Day	4 2 1 4 3 3 5% 5% 8% 9% 58%	2340
	21st to end	Day	6% 4 2 5% 5% 4 5% 5% 8% 10% 47%	2546
August	1st to 10th	Day	5% 4 1 5% 4 4 5% 4 8% 9% 50%	2328
	11th to 20th	Day	8% 3 1 4 4 4 4 4 7% 10% 50%	2301
	21st to end	Day	5% 3 2 6% 3 4 4 4 6% 9% 56%	2470
September	1st to 10th	Day	10% 4 2 5% 3 4 3 3 5% 6% 55%	1980
	11th to 20th	Day	11% 6% 2 5% 4 3 5% 4 5% 7% 48%	1980
	21st to end	Day	9% 4 1 5% 3 3 3 3 5% 7% 58%	1980
October	1st to 10th	Day	10% 5% 2 5% 3 3 4 2 4 7% 56%	1915
	11th to 20th	Day	10% 3 1 3 2 3 3 2 4 5% 65%	1800
	21st to end	Day	13% 5% 1 5% 3 3 2 2 4 5% 57%	1980
November	1st to 10th	Day	9% 3 1 3 3 3 3 3 4 6% 63%	1768
	11th to 20th	Day	8% 5% 2 4 2 2 3 3 3 5% 63%	1710
	21st to end	Day	14% 4 2 3 2 2 2 2 5% 6% 57%	1710
December	1st to 10th	Day	11% 6% 2 4 3 4 3 3 5% 7% 51%	1710
	11th to 20th	Day	13% 7% 2 7% 4 4 3 3 4 6% 48%	2161
	21st to end	Day	13% 9% 4 8% 5% 5% 5% 3 4 7% 37%	3135
January	1st to 10th	Night	11% 8% 2 7% 3 3 3 3 4 6% 50%	4108
	11th to 20th	Night	7% 5% 2 5% 4 4 4 3 4 6% 57%	4120
	21st to end	Night	18% 8% 2 4 3 2 3 2 3 4 50%	4532
February	1st to 10th	Night	12% 9% 2 6% 3 3 4 4 4 6% 47%	2470
	11th to 20th	Night	13% 7% 2 5% 3 3 2 3 4 6% 52%	2218
	21st to end	Night	11% 6% 1 4 4 3 3 3 4 6% 54%	1884
March	1st to 10th	Night	9% 6% 2 4 3 3 3 3 5% 5% 57%	3463
	11th to 20th	Night	11% 5% 2 4 3 3 3 2 4 6% 60%	3480
	21st to end	Night	13% 5% 2 6% 4 4 4 3 5% 6% 48%	3817
April	1st to 10th	Night	11% 4 1 3 3 3 3 4 5% 7% 55%	2090
	11th to 20th	Night	13% 5% 1 5% 4 3 3 3 4 6% 53%	1841
	21st to end	Night	16% 6% 2 4 4 3 2 2 4 6% 51%	1710
May	1st to 10th	Night	20% 8% 2 5% 3 3 3 3 4 6% 44%	2823
	11th to 20th	Night	13% 5% 2 5% 4 3 4 3 6% 9% 46%	2823
	21st to end	Night	10% 4 1 4 3 3 4 3 6% 9% 53%	3090
June	1st to 10th	Night	5% 4 2 5% 4 3 5% 3 5% 11% 53%	1710
	11th to 20th	Night	5% 3 1 3 3 3 4 4 7% 11% 56%	1710
	21st to end	Night	5% 1 1 3 3 3 4 3 5% 9% 63%	1710
July	1st to 10th	Night	6% 3 1 4 3 3 4 4 6% 9% 56%	1634
	11th to 20th	Night	3 3 1 3 2 3 4 4 6% 9% 62%	1620
	21st to end	Night	5% 3 1 4 3 4 3 4 8% 11% 54%	1772
August	1st to 10th	Night	4 3 1 5% 4 5% 5% 4 7% 10% 52%	1611
	11th to 20th	Night	6% 4 2 5% 4 4 4 3 7% 9% 53%	1600
	21st to end	Night	2 2 1 5% 3 2 4 4 6% 9% 61%	1881
September	1st to 10th	Night	9% 4 1 4 3 3 3 2 4 6% 60%	1980
	11th to 20th	Night	10% 6% 1 6% 4 3 4 3 5% 7% 50%	1980
	21st to end	Night	7% 4 1 4 2 3 4 3 4 6% 62%	1980
October	1st to 10th	Night	10% 4 1 4 3 4 3 3 5% 6% 58%	2025
	11th to 20th	Night	11% 4 1 3 2 2 2 3 3 5% 64%	2160
	21st to end	Night	13% 4 1 4 2 3 3 2 3 4 61%	2376
November	1st to 10th	Night	8% 4 1 3 2 3 2 3 4 6% 64%	2307
	11th to 20th	Night	10% 4 1 4 3 3 3 2 4 5% 61%	2470
	21st to end	Night	13% 6% 2 4 3 2 3 3 3 5% 58%	2470
December	1st to 10th	Night	9% 6% 2 4 3 3 3 2 4 6% 57%	2470
	11th to 20th	Night	10% 6% 2 5% 4 4 4 3 3 5% 54%	3036
	21st to end	Night	16% 7% 2 5% 3 4 4 3 5% 6% 47%	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	38% 5% 10% 27% 18% 2	2848
	11th to 20th	Day	34% 5% 16% 25% 15% 5%	2850
	21st to end	Day	43% 3 9% 22% 21% 2	3135
February	1st to 10th	Day	41% 3 12% 22% 17% 4	1724
	11th to 20th	Day	35% 3 10% 30% 18% 5%	1859
	21st to end	Day	35% 3 8% 25% 20% 9%	1570
March	1st to 10th	Day	29% 4 7% 20% 30% 10%	3393
	11th to 20th	Day	28% 6% 11% 27% 23% 5%	3480
	21st to end	Day	44% 7% 9% 25% 12% 3	3814
April	1st to 10th	Day	32% 5% 11% 25% 19% 7%	2090
	11th to 20th	Day	37% 6% 12% 22% 17% 6%	2285
	21st to end	Day	41% 5% 10% 25% 16% 2	2470
May	1st to 10th	Day	46% 6% 8% 18% 18% 4	4120
	11th to 20th	Day	33% 10% 13% 23% 20% 1	4086
	21st to end	Day	39% 8% 11% 20% 16% 6%	4489
June	1st to 10th	Day	27% 9% 17% 27% 17% 3	2470
	11th to 20th	Day	28% 6% 13% 29% 19% 5%	2470
	21st to end	Day	21% 6% 15% 28% 24% 6%	2470
July	1st to 10th	Day	30% 8% 16% 28% 15% 3	2290
	11th to 20th	Day	19% 8% 14% 29% 26% 4	2271
	21st to end	Day	28% 8% 15% 28% 20% 2	2405
August	1st to 10th	Day	25% 9% 17% 26% 18% 5%	2314
	11th to 20th	Day	29% 7% 14% 25% 23% 2	2301
	21st to end	Day	25% 8% 13% 25% 21% 8%	2470
September	1st to 10th	Day	30% 6% 10% 24% 21% 10%	1980
	11th to 20th	Day	35% 6% 11% 23% 21% 5%	1980
	21st to end	Day	26% 4 10% 24% 28% 8%	1980
October	1st to 10th	Day	28% 5% 10% 24% 28% 5%	1915
	11th to 20th	Day	24% 3 7% 27% 30% 10%	1800
	21st to end	Day	32% 4 9% 26% 22% 8%	1980
November	1st to 10th	Day	23% 4 9% 27% 29% 8%	1768
	11th to 20th	Day	25% 3 9% 28% 28% 7%	1710
	21st to end	Day	30% 4 8% 27% 25% 6%	1710
December	1st to 10th	Day	33% 5% 10% 30% 20% 2	1710
	11th to 20th	Day	38% 4 8% 25% 21% 4	2159
	21st to end	Day	46% 6% 10% 23% 14% 2	3135
January	1st to 10th	Night	35% 4 9% 30% 17% 4	4108
	11th to 20th	Night	27% 6% 16% 24% 23% 4	4120
	21st to end	Night	39% 4 8% 24% 22% 3	4532
February	1st to 10th	Night	39% 4 11% 23% 18% 6%	2470
	11th to 20th	Night	34% 4 9% 27% 20% 5%	2218
	21st to end	Night	32% 4 8% 22% 23% 12%	1884
March	1st to 10th	Night	29% 5% 7% 20% 24% 15%	3463
	11th to 20th	Night	26% 4 9% 30% 26% 5%	3480
	21st to end	Night	36% 7% 11% 32% 12% 3	3817
April	1st to 10th	Night	27% 6% 12% 21% 24% 10%	2090
	11th to 20th	Night	32% 5% 11% 24% 19% 8%	1841
	21st to end	Night	35% 5% 11% 23% 23% 4	1710
May	1st to 10th	Night	41% 7% 10% 17% 20% 5%	2850
	11th to 20th	Night	34% 9% 14% 27% 15% 1	2824
	21st to end	Night	25% 8% 15% 25% 22% 4	3099
June	1st to 10th	Night	26% 7% 18% 28% 18% 3	1710
	11th to 20th	Night	22% 7% 15% 32% 20% 5%	1710
	21st to end	Night	18% 6% 14% 30% 24% 8%	1710
July	1st to 10th	Night	23% 7% 15% 30% 21% 4	1589
	11th to 20th	Night	17% 5% 12% 29% 31% 5%	1566
	21st to end	Night	22% 7% 12% 33% 23% 3	1673
August	1st to 10th	Night	24% 8% 17% 29% 17% 5%	1601
	11th to 20th	Night	27% 7% 13% 24% 25% 5%	1600
	21st to end	Night	19% 7% 14% 27% 25% 8%	1881
September	1st to 10th	Night	26% 4 9% 26% 24% 11%	1980
	11th to 20th	Night	33% 6% 10% 20% 24% 6%	1980
	21st to end	Night	22% 6% 8% 24% 31% 8%	1980
October	1st to 10th	Night	26% 5% 11% 21% 26% 11%	2025
	11th to 20th	Night	24% 4 7% 21% 32% 12%	2160
	21st to end	Night	28% 4 7% 25% 25% 10%	2376
November	1st to 10th	Night	22% 4 9% 26% 29% 10%	2307
	11th to 20th	Night	28% 3 7% 27% 28% 7%	2470
	21st to end	Night	31% 3 7% 22% 29% 7%	2470
December	1st to 10th	Night	29% 4 11% 30% 22% 4	2470
	11th to 20th	Night	33% 5% 7% 24% 25% 5%	3037
	21st to end	Night	36% 5% 11% 27% 18% 4	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	17% 14% 33% 27% 10%	270
	11th to 20th	Day	21% 14% 35% 25% 4	270
	21st to end	Day	16% 13% 42% 24% 5%	297
February	1st to 10th	Day	19% 18% 36% 24% 3 1	270
	11th to 20th	Day	18% 17% 41% 21% 4	270
	21st to end	Day	20% 23% 38% 17% 1	225
March	1st to 10th	Day	17% 16% 43% 21% 4	270
	11th to 20th	Day	22% 14% 41% 20% 2 1	270
	21st to end	Day	20% 21% 37% 18% 4 1	297
April	1st to 10th	Day	16% 23% 36% 20% 4	270
	11th to 20th	Day	16% 20% 42% 18% 4	483
	21st to end	Day	19% 17% 36% 18% 9% 2	650
May	1st to 10th	Day	15% 11% 40% 23% 10% 1	653
	11th to 20th	Day	15% 9% 30% 31% 13% 2	675
	21st to end	Day	15% 8% 31% 27% 15% 3	734
June	1st to 10th	Day	6% 4 23% 39% 25% 4	680
	11th to 20th	Day	8% 3 30% 38% 19% 2	680
	21st to end	Day	5% 3 25% 42% 20% 4	680
July	1st to 10th	Day	8% 3 12% 35% 33% 9%	627
	11th to 20th	Day	3 3 12% 40% 36% 6%	618
	21st to end	Day	6% 2 10% 36% 38% 8%	684
August	1st to 10th	Day	7% 1 13% 44% 31% 5%	626
	11th to 20th	Day	7% 2 14% 36% 35% 7%	615
	21st to end	Day	7% 1 10% 35% 37% 10%	589
September	1st to 10th	Day	9% 1 13% 33% 36% 9%	270
	11th to 20th	Day	3 5% 17% 37% 29% 9%	270
	21st to end	Day	12% 4 21% 37% 19% 6%	270
October	1st to 10th	Day	10% 6% 29% 29% 17% 9%	270
	11th to 20th	Day	10% 9% 43% 29% 9% 1	270
	21st to end	Day	22% 12% 32% 23% 10% 2	297
November	1st to 10th	Day	14% 5% 34% 32% 11% 3	270
	11th to 20th	Day	14% 12% 37% 24% 10% 3	270
	21st to end	Day	21% 13% 35% 22% 7% 2	270
December	1st to 10th	Day	14% 12% 36% 27% 9% 2	270
	11th to 20th	Day	17% 11% 37% 27% 7% 1	270
	21st to end	Day	16% 19% 40% 21% 4	297
January	1st to 10th	Night	11% 11% 38% 33% 6%	950
	11th to 20th	Night	13% 13% 36% 31% 7%	950
	21st to end	Night	14% 12% 35% 34% 5%	1045
February	1st to 10th	Night	17% 11% 38% 30% 4	950
	11th to 20th	Night	16% 13% 40% 26% 4	744
	21st to end	Night	15% 14% 40% 28% 3	628
March	1st to 10th	Night	12% 13% 37% 33% 3	603
	11th to 20th	Night	18% 12% 35% 31% 4	570
	21st to end	Night	18% 13% 43% 22% 5%	627
April	1st to 10th	Night	14% 14% 41% 25% 5%	570
	11th to 20th	Night	17% 13% 41% 25% 4	563
	21st to end	Night	18% 13% 37% 26% 7% 1	570
May	1st to 10th	Night	16% 10% 39% 29% 5%	570
	11th to 20th	Night	13% 9% 30% 33% 13% 1	561
	21st to end	Night	10% 6% 32% 38% 12% 2	617
June	1st to 10th	Night	6% 4 27% 42% 21% 1	570
	11th to 20th	Night	6% 3 34% 43% 14%	570
	21st to end	Night	3 2 32% 48% 14% 1	570
July	1st to 10th	Night	7% 1 16% 47% 28% 2	530
	11th to 20th	Night	4 1 13% 52% 29% 2	522
	21st to end	Night	6% 1 11% 48% 31% 2	591
August	1st to 10th	Night	4 18% 48% 28% 1	537
	11th to 20th	Night	7% 1 13% 51% 25% 2	534
	21st to end	Night	3 1 14% 41% 39% 2	594
September	1st to 10th	Night	9% 3 20% 43% 24% 2	540
	11th to 20th	Night	11% 2 23% 39% 22% 3	540
	21st to end	Night	8% 4 26% 41% 18% 3	540
October	1st to 10th	Night	11% 3 31% 31% 21% 2	585
	11th to 20th	Night	13% 6% 38% 33% 9% 1	720
	21st to end	Night	15% 9% 34% 31% 11% 1	792
November	1st to 10th	Night	10% 6% 38% 33% 11% 1	827
	11th to 20th	Night	12% 11% 35% 34% 8%	950
	21st to end	Night	16% 11% 31% 32% 10%	950
December	1st to 10th	Night	12% 11% 38% 31% 8%	950
	11th to 20th	Night	17% 10% 36% 32% 5%	950
	21st to end	Night	16% 13% 35% 31% 5%	1045

Page generated at 2024-06-29 06:12:34. Version ac07

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