Osceola (MO)
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Osceola (MO) clear sky chart from 2005-11-06 to 2026-09-29.

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% 45%	148744
	Night	12% 7% 3 6% 4 4 4 3 5% 7% 47%	143031
Transparency	Day	38% 5% 11% 26% 17% 3	152356
	Night	37% 4 11% 26% 19% 4	147499
Seeing	Day	16% 11% 29% 27% 14% 3	18242
	Night	16% 11% 31% 29% 12% 1	27949

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	15% 10% 4 7% 4 4 4 3 4 5% 41%	5289
	11th to 20th	Day	7% 10% 3 8% 4 6% 4 3 5% 6% 44%	5310
	21st to end	Day	15% 12% 3 7% 3 3 4 3 4 4 42%	5812
February	1st to 10th	Day	15% 11% 4 9% 4 3 3 3 4 6% 38%	1890
	11th to 20th	Day	14% 11% 4 6% 4 4 4 3 4 5% 41%	1844
	21st to end	Day	14% 10% 3 7% 4 4 3 4 5% 5% 40%	1806
March	1st to 10th	Day	15% 9% 3 5% 3 3 3 2 4 5% 48%	5046
	11th to 20th	Day	12% 7% 2 4 3 3 3 2 5% 6% 54%	5090
	21st to end	Day	14% 11% 3 7% 5% 4 5% 4 5% 7% 35%	5583
April	1st to 10th	Day	15% 8% 2 6% 4 4 4 3 5% 6% 42%	2471
	11th to 20th	Day	17% 8% 2 6% 4 3 4 4 5% 6% 41%	2494
	21st to end	Day	20% 8% 3 7% 5% 4 4 3 5% 6% 34%	2546
May	1st to 10th	Day	17% 7% 3 6% 4 4 4 3 5% 7% 40%	7617
	11th to 20th	Day	13% 6% 2 6% 4 4 5% 4 5% 7% 43%	7627
	21st to end	Day	21% 8% 3 6% 5% 4 4 3 5% 7% 34%	8745
June	1st to 10th	Day	8% 5% 2 6% 4 4 4 4 7% 10% 46%	2940
	11th to 20th	Day	9% 4 2 6% 4 4 5% 5% 6% 9% 46%	2940
	21st to end	Day	6% 3 1 5% 4 4 5% 5% 7% 9% 52%	2940
July	1st to 10th	Day	8% 5% 2 6% 4 4 4 3 6% 9% 48%	7800
	11th to 20th	Day	5% 4 2 7% 4 5% 5% 4 6% 10% 48%	7680
	21st to end	Day	8% 5% 2 6% 5% 5% 6% 5% 8% 11% 41%	8337
August	1st to 10th	Day	6% 4 2 5% 4 4 4 4 6% 9% 52%	6014
	11th to 20th	Day	6% 4 2 5% 4 4 4 4 6% 10% 49%	5903
	21st to end	Day	6% 4 1 4 3 4 3 3 5% 9% 58%	6080
September	1st to 10th	Day	10% 5% 2 6% 4 3 4 3 5% 6% 52%	2520
	11th to 20th	Day	9% 6% 2 6% 4 4 4 3 4 7% 51%	2415
	21st to end	Day	9% 5% 2 5% 4 4 4 4 5% 6% 51%	2227
October	1st to 10th	Day	11% 5% 2 4 3 4 3 2 4 5% 56%	2000
	11th to 20th	Day	15% 5% 2 5% 3 3 3 2 3 5% 55%	2000
	21st to end	Day	20% 7% 2 7% 3 2 3 2 3 5% 47%	2200
November	1st to 10th	Day	12% 6% 2 4 3 2 2 3 4 5% 57%	2058
	11th to 20th	Day	15% 8% 3 5% 3 3 3 3 4 5% 49%	1872
	21st to end	Day	17% 9% 3 6% 3 3 3 3 4 6% 45%	1680
December	1st to 10th	Day	9% 10% 3 6% 3 3 2 3 5% 5% 52%	2690
	11th to 20th	Day	12% 9% 4 6% 4 3 3 3 4 5% 49%	3088
	21st to end	Day	20% 22% 5% 8% 4 3 3 2 3 5% 26%	4190
January	1st to 10th	Night	14% 10% 4 11% 5% 4 3 2 3 4 38%	7634
	11th to 20th	Night	9% 7% 3 10% 5% 5% 4 3 3 5% 47%	7680
	21st to end	Night	15% 10% 3 7% 4 4 3 3 4 5% 41%	8402
February	1st to 10th	Night	13% 12% 4 6% 4 3 4 4 5% 6% 39%	2730
	11th to 20th	Night	15% 9% 3 7% 4 3 3 3 4 6% 43%	2663
	21st to end	Night	15% 9% 2 6% 4 5% 3 3 4 5% 45%	2014
March	1st to 10th	Night	16% 10% 2 5% 4 3 3 3 4 4 45%	5029
	11th to 20th	Night	11% 7% 2 4 3 3 3 3 5% 6% 54%	5090
	21st to end	Night	13% 7% 3 7% 5% 4 4 4 5% 7% 40%	5588
April	1st to 10th	Night	12% 7% 2 4 4 3 3 3 5% 6% 50%	2147
	11th to 20th	Night	15% 7% 2 5% 3 3 3 3 5% 6% 47%	2075
	21st to end	Night	18% 6% 3 6% 5% 3 4 3 5% 7% 41%	2069
May	1st to 10th	Night	16% 7% 3 6% 4 4 4 3 5% 7% 42%	5266
	11th to 20th	Night	13% 7% 3 6% 4 3 3 3 5% 9% 46%	5265
	21st to end	Night	18% 7% 3 6% 4 4 4 3 5% 6% 41%	5435
June	1st to 10th	Night	6% 4 2 6% 3 3 4 3 7% 10% 51%	1680
	11th to 20th	Night	6% 3 2 4 3 4 4 5% 9% 10% 50%	1680
	21st to end	Night	5% 3 1 3 3 3 4 3 6% 9% 60%	1680
July	1st to 10th	Night	7% 5% 2 6% 4 4 4 4 7% 10% 48%	5181
	11th to 20th	Night	5% 3 2 5% 3 4 5% 4 6% 11% 53%	5307
	21st to end	Night	5% 4 2 5% 4 4 5% 4 8% 12% 48%	5770
August	1st to 10th	Night	4 3 1 4 3 3 4 3 6% 8% 62%	4156
	11th to 20th	Night	7% 4 2 5% 4 4 4 3 6% 8% 54%	4159
	21st to end	Night	4 3 1 4 3 3 4 3 5% 8% 63%	5046
September	1st to 10th	Night	10% 4 1 4 3 3 3 3 5% 7% 56%	2100
	11th to 20th	Night	9% 5% 2 5% 3 4 4 4 6% 7% 51%	2201
	21st to end	Night	8% 4 2 6% 4 3 3 3 5% 7% 55%	2329
October	1st to 10th	Night	8% 4 1 4 2 3 3 3 5% 6% 61%	2400
	11th to 20th	Night	14% 5% 2 3 3 3 3 3 4 5% 55%	2400
	21st to end	Night	17% 6% 2 5% 3 4 3 2 3 5% 51%	2640
November	1st to 10th	Night	12% 6% 2 3 2 3 3 3 4 5% 59%	2460
	11th to 20th	Night	12% 7% 2 5% 4 4 3 2 3 6% 53%	2744
	21st to end	Night	16% 9% 2 5% 3 3 3 2 4 4 48%	2940
December	1st to 10th	Night	10% 8% 3 6% 3 3 3 3 4 5% 51%	4720
	11th to 20th	Night	15% 9% 3 7% 4 3 3 3 4 5% 44%	5339
	21st to end	Night	21% 19% 5% 9% 3 3 3 2 3 4 28%	7012

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% 3 9% 27% 13% 1	5290
	11th to 20th	Day	42% 3 9% 28% 15% 4	5310
	21st to end	Day	47% 3 9% 19% 17% 6%	5812
February	1st to 10th	Day	49% 4 10% 23% 11% 1	1890
	11th to 20th	Day	47% 4 12% 20% 15% 3	1853
	21st to end	Day	46% 3 7% 23% 15% 6%	1806
March	1st to 10th	Day	40% 3 7% 23% 21% 6%	5046
	11th to 20th	Day	32% 4 8% 23% 24% 8%	5090
	21st to end	Day	48% 6% 15% 25% 6% 1	5585
April	1st to 10th	Day	43% 5% 11% 23% 16% 2	2471
	11th to 20th	Day	43% 5% 12% 21% 17% 1	2494
	21st to end	Day	50% 5% 11% 22% 10% 1	2546
May	1st to 10th	Day	43% 5% 12% 24% 15% 1	7655
	11th to 20th	Day	39% 6% 12% 24% 17% 2	7631
	21st to end	Day	49% 6% 10% 23% 12%	8759
June	1st to 10th	Day	32% 8% 17% 25% 17% 1	2940
	11th to 20th	Day	33% 7% 15% 28% 15% 2	2940
	21st to end	Day	27% 7% 16% 31% 16% 4	2940
July	1st to 10th	Day	33% 5% 14% 25% 20% 2	7736
	11th to 20th	Day	31% 7% 14% 28% 16% 4	7611
	21st to end	Day	33% 8% 18% 32% 8%	8155
August	1st to 10th	Day	29% 6% 15% 27% 23%	6000
	11th to 20th	Day	31% 5% 15% 34% 14% 1	5942
	21st to end	Day	25% 5% 13% 40% 14% 3	6079
September	1st to 10th	Day	33% 6% 11% 27% 18% 6%	2520
	11th to 20th	Day	34% 6% 9% 27% 23% 2	2415
	21st to end	Day	32% 7% 10% 24% 23% 4	2227
October	1st to 10th	Day	19% 3 5% 20% 40% 13%	3260
	11th to 20th	Day	22% 2 5% 24% 38% 9%	3240
	21st to end	Day	36% 4 7% 26% 24% 4	3538
November	1st to 10th	Day	31% 4 10% 29% 21% 4	2058
	11th to 20th	Day	38% 2 9% 23% 22% 5%	1872
	21st to end	Day	43% 3 9% 27% 17% 1	1680
December	1st to 10th	Day	35% 3 10% 37% 15%	2690
	11th to 20th	Day	39% 3 9% 30% 18% 2	3085
	21st to end	Day	63% 3 9% 17% 6% 1	4190
January	1st to 10th	Night	51% 3 11% 24% 10% 1	7635
	11th to 20th	Night	43% 3 7% 27% 18% 3	7680
	21st to end	Night	47% 2 11% 20% 16% 4	8402
February	1st to 10th	Night	45% 4 12% 22% 14% 2	2730
	11th to 20th	Night	44% 4 10% 24% 16% 3	2664
	21st to end	Night	42% 2 8% 24% 19% 6%	2014
March	1st to 10th	Night	43% 4 7% 19% 23% 5%	5029
	11th to 20th	Night	32% 3 7% 23% 28% 7%	5090
	21st to end	Night	42% 6% 14% 25% 12% 2	5588
April	1st to 10th	Night	35% 5% 12% 22% 22% 4	2147
	11th to 20th	Night	39% 4 10% 24% 19% 5%	2075
	21st to end	Night	44% 6% 11% 25% 14% 1	2069
May	1st to 10th	Night	42% 6% 13% 24% 14% 1	5293
	11th to 20th	Night	37% 5% 11% 23% 18% 5%	5266
	21st to end	Night	44% 7% 10% 23% 15% 2	5446
June	1st to 10th	Night	27% 7% 17% 29% 17% 3	1680
	11th to 20th	Night	25% 9% 14% 28% 21% 3	1680
	21st to end	Night	19% 6% 16% 32% 21% 5%	1680
July	1st to 10th	Night	30% 5% 15% 26% 21% 2	5138
	11th to 20th	Night	26% 7% 13% 32% 18% 4	5256
	21st to end	Night	27% 6% 19% 38% 10%	5641
August	1st to 10th	Night	21% 5% 15% 31% 25% 2	4146
	11th to 20th	Night	29% 4 12% 36% 19% 1	4186
	21st to end	Night	21% 5% 13% 39% 19% 3	5046
September	1st to 10th	Night	28% 5% 11% 28% 21% 7%	2100
	11th to 20th	Night	30% 6% 10% 25% 24% 5%	2201
	21st to end	Night	29% 4 9% 25% 29% 4	2329
October	1st to 10th	Night	15% 3 6% 20% 42% 13%	3920
	11th to 20th	Night	23% 3 7% 22% 29% 16%	3899
	21st to end	Night	31% 3 7% 31% 24% 4	4252
November	1st to 10th	Night	29% 4 11% 28% 22% 6%	2460
	11th to 20th	Night	35% 3 7% 26% 24% 5%	2744
	21st to end	Night	41% 4 9% 26% 19% 3	2940
December	1st to 10th	Night	36% 4 10% 34% 15% 1	4720
	11th to 20th	Night	43% 3 10% 25% 18% 2	5341
	21st to end	Night	62% 3 9% 18% 7% 1	7012

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	20% 18% 39% 21% 2	330
	11th to 20th	Day	27% 24% 38% 10% 1	330
	21st to end	Day	17% 21% 49% 10% 2	363
February	1st to 10th	Day	23% 23% 37% 14% 2	330
	11th to 20th	Day	23% 25% 38% 11% 4	330
	21st to end	Day	24% 25% 38% 10% 3	273
March	1st to 10th	Day	24% 22% 37% 15% 2	330
	11th to 20th	Day	30% 18% 35% 14% 3	330
	21st to end	Day	34% 20% 35% 8% 3	363
April	1st to 10th	Day	26% 18% 33% 18% 4	491
	11th to 20th	Day	24% 18% 39% 15% 3	532
	21st to end	Day	25% 16% 33% 22% 5%	566
May	1st to 10th	Day	20% 16% 37% 21% 6%	753
	11th to 20th	Day	17% 15% 31% 25% 11% 2	775
	21st to end	Day	18% 8% 32% 24% 14% 4	844
June	1st to 10th	Day	9% 6% 23% 36% 22% 4	780
	11th to 20th	Day	10% 5% 25% 36% 21% 3	780
	21st to end	Day	6% 6% 33% 35% 16% 3	780
July	1st to 10th	Day	10% 3 16% 34% 28% 9%	771
	11th to 20th	Day	5% 3 19% 41% 27% 6%	768
	21st to end	Day	9% 2 15% 37% 30% 6%	849
August	1st to 10th	Day	8% 2 19% 42% 24% 5%	776
	11th to 20th	Day	8% 5% 19% 37% 27% 5%	746
	21st to end	Day	10% 3 14% 33% 32% 8%	627
September	1st to 10th	Day	10% 4 14% 39% 26% 6%	570
	11th to 20th	Day	7% 3 18% 40% 25% 6%	465
	21st to end	Day	13% 7% 22% 35% 16% 7%	354
October	1st to 10th	Day	12% 8% 28% 29% 16% 5%	330
	11th to 20th	Day	18% 16% 35% 24% 8% 1	330
	21st to end	Day	31% 13% 33% 18% 3 1	363
November	1st to 10th	Day	17% 16% 40% 19% 7% 1	330
	11th to 20th	Day	18% 22% 34% 18% 8% 1	330
	21st to end	Day	25% 18% 32% 20% 4	330
December	1st to 10th	Day	18% 19% 39% 17% 6% 2	330
	11th to 20th	Day	20% 20% 38% 18% 3 1	330
	21st to end	Day	24% 27% 35% 13% 1	363
January	1st to 10th	Night	18% 17% 38% 23% 4	1050
	11th to 20th	Night	19% 19% 38% 19% 4	1050
	21st to end	Night	18% 18% 38% 24% 3	1155
February	1st to 10th	Night	20% 16% 41% 21% 3	1050
	11th to 20th	Night	21% 17% 37% 21% 3	1029
	21st to end	Night	21% 19% 38% 19% 3	630
March	1st to 10th	Night	20% 17% 36% 23% 3	630
	11th to 20th	Night	25% 13% 34% 24% 4	630
	21st to end	Night	22% 16% 38% 21% 3	693
April	1st to 10th	Night	16% 15% 38% 26% 4	630
	11th to 20th	Night	20% 16% 35% 23% 6%	623
	21st to end	Night	21% 10% 39% 23% 6%	630
May	1st to 10th	Night	16% 9% 34% 32% 9%	630
	11th to 20th	Night	16% 9% 29% 31% 14% 1	621
	21st to end	Night	14% 6% 27% 33% 17% 2	683
June	1st to 10th	Night	8% 3 21% 41% 26% 1	630
	11th to 20th	Night	7% 2 25% 45% 20% 1	630
	21st to end	Night	6% 2 29% 45% 17% 1	630
July	1st to 10th	Night	11% 2 13% 39% 31% 4	615
	11th to 20th	Night	4 1 17% 44% 31% 3	612
	21st to end	Night	7% 2 14% 40% 35% 2	690
August	1st to 10th	Night	4 3 18% 45% 27% 2	627
	11th to 20th	Night	6% 2 15% 46% 27% 4	624
	21st to end	Night	5% 1 15% 39% 37% 3	693
September	1st to 10th	Night	11% 2 16% 43% 25% 3	630
	11th to 20th	Night	12% 1 16% 39% 27% 4	630
	21st to end	Night	9% 6% 22% 41% 20% 3	665
October	1st to 10th	Night	9% 5% 29% 32% 22% 3	800
	11th to 20th	Night	16% 10% 37% 28% 9%	800
	21st to end	Night	19% 14% 34% 26% 7% 1	880
November	1st to 10th	Night	14% 11% 37% 28% 9%	820
	11th to 20th	Night	16% 16% 36% 25% 7%	934
	21st to end	Night	22% 14% 36% 22% 6%	1050
December	1st to 10th	Night	18% 16% 37% 24% 5%	1050
	11th to 20th	Night	23% 13% 35% 26% 4	1050
	21st to end	Night	23% 17% 36% 22% 2	1155

Page generated at 2026-09-26 03:18:43. Version ac07

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