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 2025-05-26.

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% 8% 3 6% 4 4 4 3 5% 7% 45%	114094
	Night	12% 8% 3 6% 4 3 3 3 5% 6% 47%	115368
Transparency	Day	38% 5% 11% 25% 17% 3	117747
	Night	37% 4 10% 25% 19% 4	119857
Seeing	Day	16% 12% 28% 27% 14% 3	16293
	Night	16% 11% 31% 29% 12% 1	26230

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	17% 10% 4 7% 5% 4 4 3 4 5% 38%	4077
	11th to 20th	Day	9% 11% 3 8% 4 6% 4 3 5% 5% 41%	4080
	21st to end	Day	15% 13% 3 7% 3 3 4 3 4 5% 40%	4488
February	1st to 10th	Day	16% 12% 4 9% 4 4 3 3 4 6% 36%	1800
	11th to 20th	Day	15% 11% 4 6% 4 4 4 3 4 5% 40%	1754
	21st to end	Day	15% 10% 3 7% 4 4 3 4 5% 5% 40%	1722
March	1st to 10th	Day	15% 9% 3 5% 3 3 3 2 4 5% 49%	4936
	11th to 20th	Day	11% 7% 2 4 3 3 3 3 5% 6% 53%	4980
	21st to end	Day	15% 11% 3 7% 5% 4 5% 4 5% 7% 35%	5462
April	1st to 10th	Day	15% 8% 2 6% 4 4 4 4 5% 6% 42%	2353
	11th to 20th	Day	17% 8% 2 6% 4 3 4 4 5% 6% 41%	2374
	21st to end	Day	20% 8% 3 7% 5% 4 4 3 5% 7% 35%	2425
May	1st to 10th	Day	18% 8% 3 7% 4 4 5% 3 5% 7% 35%	4212
	11th to 20th	Day	16% 7% 2 6% 4 4 4 3 5% 7% 41%	4212
	21st to end	Day	13% 6% 2 6% 5% 5% 5% 4 6% 8% 40%	4728
June	1st to 10th	Day	7% 5% 2 6% 4 4 4 4 7% 9% 47%	2660
	11th to 20th	Day	8% 4 2 6% 5% 4 5% 5% 6% 9% 47%	2660
	21st to end	Day	5% 2 1 4 4 4 5% 4 7% 9% 54%	2660
July	1st to 10th	Day	11% 7% 2 7% 5% 5% 4 3 6% 8% 42%	4184
	11th to 20th	Day	5% 4 2 6% 4 5% 5% 4 6% 9% 50%	4120
	21st to end	Day	7% 4 2 5% 5% 5% 5% 6% 9% 12% 42%	4465
August	1st to 10th	Day	4 4 2 5% 4 4 5% 4 6% 10% 52%	4104
	11th to 20th	Day	9% 6% 3 6% 4 5% 4 4 5% 9% 45%	4011
	21st to end	Day	6% 4 1 4 3 4 3 3 5% 8% 58%	4180
September	1st to 10th	Day	10% 5% 2 6% 4 3 4 3 5% 5% 52%	2280
	11th to 20th	Day	10% 5% 2 6% 4 4 4 3 4 6% 51%	2185
	21st to end	Day	8% 5% 2 5% 3 4 4 4 5% 6% 53%	2033
October	1st to 10th	Day	12% 5% 2 4 3 4 3 2 4 5% 56%	1900
	11th to 20th	Day	15% 5% 2 5% 3 3 3 2 3 5% 55%	1900
	21st to end	Day	19% 7% 2 6% 3 2 3 2 2 5% 47%	2090
November	1st to 10th	Day	13% 6% 2 5% 3 2 2 3 4 5% 56%	1958
	11th to 20th	Day	15% 8% 2 5% 3 3 3 3 4 5% 49%	1784
	21st to end	Day	16% 9% 3 5% 3 3 3 3 4 6% 46%	1600
December	1st to 10th	Day	8% 10% 3 7% 3 3 2 3 5% 4 53%	2610
	11th to 20th	Day	12% 9% 4 6% 3 3 3 2 4 5% 49%	3008
	21st to end	Day	20% 22% 5% 8% 4 3 3 2 3 5% 25%	4099
January	1st to 10th	Night	14% 10% 5% 13% 6% 5% 4 2 3 4 34%	5888
	11th to 20th	Night	11% 8% 3 11% 6% 6% 5% 3 3 5% 40%	5900
	21st to end	Night	16% 11% 4 7% 4 3 3 2 3 4 43%	6490
February	1st to 10th	Night	14% 12% 4 6% 4 4 4 4 5% 6% 38%	2600
	11th to 20th	Night	15% 9% 3 7% 4 3 3 3 4 6% 42%	2533
	21st to end	Night	15% 9% 2 6% 4 5% 3 3 4 5% 45%	1921
March	1st to 10th	Night	16% 10% 2 5% 4 3 3 3 4 4 45%	4919
	11th to 20th	Night	11% 7% 2 3 3 3 3 3 5% 6% 54%	4980
	21st to end	Night	14% 8% 3 7% 5% 4 4 4 5% 7% 39%	5467
April	1st to 10th	Night	11% 7% 2 4 4 3 3 2 5% 6% 51%	2045
	11th to 20th	Night	15% 8% 2 5% 3 3 3 3 5% 6% 47%	1975
	21st to end	Night	18% 6% 3 6% 5% 3 4 3 5% 7% 40%	1970
May	1st to 10th	Night	16% 8% 3 6% 4 4 4 4 5% 7% 40%	2913
	11th to 20th	Night	14% 8% 3 6% 4 3 4 3 5% 9% 41%	2913
	21st to end	Night	12% 4 2 5% 4 4 3 4 5% 7% 50%	2950
June	1st to 10th	Night	5% 4 2 5% 3 3 4 4 8% 10% 53%	1520
	11th to 20th	Night	5% 3 1 5% 3 4 4 5% 8% 10% 51%	1520
	21st to end	Night	4 3 1 3 3 3 4 3 6% 10% 62%	1520
July	1st to 10th	Night	11% 7% 3 6% 4 3 3 3 5% 9% 46%	2779
	11th to 20th	Night	4 3 1 4 3 3 4 3 5% 11% 59%	2850
	21st to end	Night	6% 4 1 5% 4 3 4 4 7% 12% 51%	3098
August	1st to 10th	Night	3 2 1 3 3 2 3 3 6% 8% 64%	2836
	11th to 20th	Night	9% 5% 2 6% 4 4 4 3 6% 7% 51%	2825
	21st to end	Night	3 3 1 3 3 3 4 3 6% 8% 60%	3476
September	1st to 10th	Night	10% 4 1 4 3 3 3 3 5% 7% 57%	1900
	11th to 20th	Night	10% 5% 2 4 3 4 4 4 5% 7% 52%	1991
	21st to end	Night	8% 4 2 5% 4 3 3 3 5% 7% 57%	2128
October	1st to 10th	Night	8% 4 1 4 2 3 3 3 5% 6% 60%	2280
	11th to 20th	Night	14% 5% 2 3 3 3 3 3 4 5% 56%	2280
	21st to end	Night	16% 6% 2 5% 3 4 3 2 4 5% 52%	2508
November	1st to 10th	Night	12% 6% 2 3 2 3 3 3 4 5% 59%	2340
	11th to 20th	Night	12% 7% 2 5% 4 4 3 2 3 6% 52%	2613
	21st to end	Night	16% 9% 2 5% 3 3 3 2 4 4 49%	2800
December	1st to 10th	Night	10% 8% 3 5% 3 3 3 3 4 5% 52%	4580
	11th to 20th	Night	15% 9% 3 7% 4 3 3 3 4 5% 44%	5199
	21st to end	Night	22% 19% 5% 9% 3 3 3 2 3 4 28%	6861

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	50% 3 9% 25% 13% 1	4078
	11th to 20th	Day	45% 3 9% 24% 16% 3	4080
	21st to end	Day	48% 3 9% 17% 17% 7%	4488
February	1st to 10th	Day	51% 5% 10% 22% 11% 1	1800
	11th to 20th	Day	48% 4 12% 19% 15% 3	1763
	21st to end	Day	46% 3 7% 24% 14% 6%	1722
March	1st to 10th	Day	39% 3 7% 23% 22% 7%	4936
	11th to 20th	Day	32% 4 8% 23% 24% 9%	4980
	21st to end	Day	49% 6% 15% 24% 5%	5464
April	1st to 10th	Day	42% 5% 11% 23% 16% 3	2353
	11th to 20th	Day	43% 5% 13% 22% 16% 1	2374
	21st to end	Day	50% 5% 11% 22% 11% 1	2425
May	1st to 10th	Day	48% 7% 12% 19% 14% 1	4250
	11th to 20th	Day	41% 8% 13% 24% 14%	4216
	21st to end	Day	41% 7% 12% 27% 13% 1	4741
June	1st to 10th	Day	31% 9% 17% 25% 17% 1	2660
	11th to 20th	Day	32% 7% 16% 29% 15% 2	2660
	21st to end	Day	25% 7% 15% 32% 16% 4	2660
July	1st to 10th	Day	40% 6% 12% 23% 16% 3	4120
	11th to 20th	Day	30% 7% 12% 32% 18% 2	4051
	21st to end	Day	30% 9% 23% 28% 10%	4325
August	1st to 10th	Day	26% 7% 17% 26% 23% 1	4090
	11th to 20th	Day	36% 6% 15% 28% 14% 1	4050
	21st to end	Day	25% 5% 13% 39% 14% 4	4179
September	1st to 10th	Day	34% 6% 11% 26% 18% 7%	2280
	11th to 20th	Day	34% 6% 9% 25% 25% 2	2185
	21st to end	Day	31% 7% 10% 25% 23% 4	2033
October	1st to 10th	Day	19% 3 5% 20% 40% 14%	3160
	11th to 20th	Day	22% 2 5% 24% 38% 10%	3140
	21st to end	Day	35% 4 7% 26% 25% 4	3428
November	1st to 10th	Day	32% 4 10% 28% 21% 4	1958
	11th to 20th	Day	38% 2 9% 22% 23% 5%	1784
	21st to end	Day	42% 3 9% 27% 17% 1	1600
December	1st to 10th	Day	35% 3 10% 37% 15%	2610
	11th to 20th	Day	39% 3 9% 29% 18% 1	3005
	21st to end	Day	64% 3 9% 17% 6% 1	4099
January	1st to 10th	Night	54% 4 11% 19% 11% 1	5888
	11th to 20th	Night	48% 3 8% 24% 14% 3	5900
	21st to end	Night	47% 2 9% 20% 17% 5%	6490
February	1st to 10th	Night	47% 5% 11% 22% 13% 2	2600
	11th to 20th	Night	44% 4 10% 23% 16% 3	2534
	21st to end	Night	42% 2 8% 24% 18% 6%	1921
March	1st to 10th	Night	43% 4 7% 19% 23% 5%	4919
	11th to 20th	Night	32% 3 7% 22% 28% 7%	4980
	21st to end	Night	43% 6% 14% 25% 11% 1	5467
April	1st to 10th	Night	34% 5% 12% 23% 22% 4	2045
	11th to 20th	Night	38% 4 10% 25% 19% 5%	1975
	21st to end	Night	44% 6% 11% 24% 14% 1	1970
May	1st to 10th	Night	42% 7% 14% 20% 14% 3	2940
	11th to 20th	Night	41% 7% 12% 27% 12% 2	2914
	21st to end	Night	32% 7% 13% 29% 18% 1	2958
June	1st to 10th	Night	25% 7% 18% 29% 17% 4	1520
	11th to 20th	Night	23% 9% 14% 29% 22% 3	1520
	21st to end	Night	18% 6% 16% 33% 22% 6%	1520
July	1st to 10th	Night	36% 5% 13% 25% 17% 4	2734
	11th to 20th	Night	20% 5% 11% 38% 24% 2	2796
	21st to end	Night	25% 6% 21% 33% 14% 1	2999
August	1st to 10th	Night	18% 5% 18% 32% 23% 3	2826
	11th to 20th	Night	34% 4 11% 31% 19% 1	2852
	21st to end	Night	21% 6% 13% 38% 18% 4	3476
September	1st to 10th	Night	27% 5% 12% 27% 22% 8%	1900
	11th to 20th	Night	30% 6% 10% 23% 26% 5%	1991
	21st to end	Night	28% 4 8% 27% 30% 4	2128
October	1st to 10th	Night	15% 3 6% 20% 42% 13%	3800
	11th to 20th	Night	23% 3 7% 21% 30% 17%	3779
	21st to end	Night	30% 3 7% 31% 25% 4	4120
November	1st to 10th	Night	29% 4 12% 27% 22% 6%	2340
	11th to 20th	Night	36% 3 6% 25% 25% 5%	2613
	21st to end	Night	39% 4 9% 26% 19% 3	2800
December	1st to 10th	Night	35% 4 10% 35% 15% 1	4580
	11th to 20th	Night	43% 3 10% 25% 18% 2	5201
	21st to end	Night	63% 3 9% 18% 6% 1	6861

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	21% 18% 37% 22% 2	300
	11th to 20th	Day	28% 22% 38% 11% 1	300
	21st to end	Day	17% 21% 48% 11% 2	330
February	1st to 10th	Day	24% 23% 36% 15% 1	300
	11th to 20th	Day	22% 25% 38% 11% 4	300
	21st to end	Day	23% 25% 38% 10% 3	249
March	1st to 10th	Day	22% 21% 38% 16% 2	300
	11th to 20th	Day	29% 19% 34% 15% 3	300
	21st to end	Day	36% 19% 35% 8% 2	330
April	1st to 10th	Day	26% 20% 31% 19% 4	453
	11th to 20th	Day	24% 17% 39% 16% 3	492
	21st to end	Day	25% 16% 32% 23% 5%	525
May	1st to 10th	Day	21% 14% 37% 21% 6%	703
	11th to 20th	Day	17% 15% 30% 25% 11% 2	725
	21st to end	Day	17% 9% 32% 24% 14% 4	760
June	1st to 10th	Day	8% 5% 22% 38% 23% 5%	680
	11th to 20th	Day	9% 4 25% 38% 21% 3	680
	21st to end	Day	5% 6% 33% 36% 17% 3	680
July	1st to 10th	Day	11% 3 16% 32% 29% 9%	671
	11th to 20th	Day	4 3 19% 41% 26% 6%	668
	21st to end	Day	9% 2 15% 36% 31% 7%	739
August	1st to 10th	Day	8% 2 17% 42% 25% 5%	676
	11th to 20th	Day	9% 5% 19% 36% 27% 5%	648
	21st to end	Day	10% 2 13% 31% 34% 9%	539
September	1st to 10th	Day	10% 4 15% 37% 27% 7%	490
	11th to 20th	Day	8% 3 18% 41% 24% 6%	395
	21st to end	Day	12% 8% 24% 37% 15% 5%	300
October	1st to 10th	Day	13% 9% 28% 29% 15% 6%	300
	11th to 20th	Day	17% 16% 35% 24% 7%	300
	21st to end	Day	30% 14% 33% 18% 3 1	330
November	1st to 10th	Day	18% 15% 38% 20% 7% 1	300
	11th to 20th	Day	19% 22% 33% 18% 8% 1	300
	21st to end	Day	25% 18% 31% 22% 4	300
December	1st to 10th	Day	17% 19% 39% 18% 6% 2	300
	11th to 20th	Day	21% 19% 37% 19% 3 1	300
	21st to end	Day	25% 28% 34% 13% 1	330
January	1st to 10th	Night	17% 17% 38% 23% 5%	1000
	11th to 20th	Night	20% 18% 38% 20% 4	1000
	21st to end	Night	18% 17% 38% 24% 3	1100
February	1st to 10th	Night	21% 16% 40% 19% 3	1000
	11th to 20th	Night	21% 17% 37% 21% 3	979
	21st to end	Night	22% 18% 38% 19% 3	601
March	1st to 10th	Night	19% 18% 36% 24% 4	600
	11th to 20th	Night	25% 12% 34% 25% 4 1	600
	21st to end	Night	23% 16% 37% 21% 3	660
April	1st to 10th	Night	16% 15% 38% 26% 5%	600
	11th to 20th	Night	19% 16% 34% 23% 7%	593
	21st to end	Night	21% 10% 39% 24% 7%	600
May	1st to 10th	Night	16% 9% 34% 33% 9%	600
	11th to 20th	Night	15% 8% 29% 32% 15% 1	591
	21st to end	Night	14% 6% 29% 32% 18% 2	634
June	1st to 10th	Night	7% 3 19% 41% 28% 1	570
	11th to 20th	Night	6% 2 26% 46% 20% 1	570
	21st to end	Night	5% 2 28% 46% 18% 1	570
July	1st to 10th	Night	12% 2 14% 38% 31% 4	555
	11th to 20th	Night	3 1 18% 44% 30% 3	552
	21st to end	Night	8% 2 13% 39% 37% 2	624
August	1st to 10th	Night	5% 2 16% 46% 30% 2	567
	11th to 20th	Night	7% 2 15% 46% 26% 4	564
	21st to end	Night	5% 1 16% 36% 39% 3	627
September	1st to 10th	Night	11% 2 16% 41% 27% 4	570
	11th to 20th	Night	13% 2 16% 39% 26% 4	570
	21st to end	Night	9% 5% 22% 40% 20% 3	608
October	1st to 10th	Night	10% 5% 29% 32% 22% 3	760
	11th to 20th	Night	16% 10% 38% 28% 8%	760
	21st to end	Night	18% 14% 33% 27% 7% 1	836
November	1st to 10th	Night	14% 11% 37% 28% 10% 1	780
	11th to 20th	Night	16% 16% 35% 25% 7%	889
	21st to end	Night	21% 14% 37% 22% 6%	1000
December	1st to 10th	Night	18% 16% 37% 25% 5%	1000
	11th to 20th	Night	23% 13% 34% 26% 4	1000
	21st to end	Night	23% 17% 36% 22% 2	1100

Page generated at 2025-05-23 08:21:04. Version ac07

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