Boonville
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Boonville clear sky chart from 2005-11-06 to 2024-03-01.

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	13% 7% 3 6% 5% 3 4 4 5% 7% 42%	78578
	Night	13% 8% 3 6% 5% 3 4 4 5% 6% 44%	80866
Transparency	Day	42% 5% 12% 25% 15% 2	78293
	Night	41% 4 11% 24% 16% 3	80671
Seeing	Day	15% 9% 25% 28% 18% 6%	14642
	Night	16% 8% 29% 32% 14% 1	24691

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% 12% 4 9% 5% 3 5% 5% 4 6% 33%	2669
	11th to 20th	Day	12% 11% 5% 9% 5% 4 7% 3 3 5% 35%	2850
	21st to end	Day	17% 16% 6% 7% 4 3 3 4 4 5% 30%	3135
February	1st to 10th	Day	18% 8% 5% 8% 6% 3 4 3 4 6% 34%	1710
	11th to 20th	Day	14% 8% 5% 6% 4 3 5% 4 4 5% 42%	1686
	21st to end	Day	15% 10% 4 6% 5% 3 4 4 4 5% 39%	1571
March	1st to 10th	Day	14% 9% 5% 6% 6% 3 4 4 4 6% 40%	1980
	11th to 20th	Day	20% 10% 4 6% 5% 3 3 4 5% 7% 34%	1980
	21st to end	Day	22% 11% 4 7% 6% 3 4 3 5% 6% 28%	2186
April	1st to 10th	Day	14% 6% 4 6% 5% 3 3 4 6% 6% 43%	2160
	11th to 20th	Day	16% 9% 3 5% 5% 3 4 4 4 6% 40%	2134
	21st to end	Day	21% 7% 2 6% 5% 3 5% 5% 4 6% 35%	2160
May	1st to 10th	Day	17% 7% 3 6% 6% 3 4 5% 5% 8% 35%	2322
	11th to 20th	Day	16% 7% 3 5% 5% 3 5% 4 5% 7% 39%	2368
	21st to end	Day	11% 7% 3 7% 6% 4 5% 6% 6% 8% 36%	2725
June	1st to 10th	Day	7% 4 2 5% 5% 4 5% 5% 6% 10% 47%	2520
	11th to 20th	Day	8% 5% 3 5% 5% 3 4 6% 6% 8% 47%	2520
	21st to end	Day	6% 4 2 4 5% 3 5% 5% 7% 9% 49%	2520
July	1st to 10th	Day	9% 4 2 4 5% 4 5% 5% 8% 11% 43%	2520
	11th to 20th	Day	5% 4 1 4 5% 3 5% 6% 7% 10% 51%	2390
	21st to end	Day	8% 5% 3 4 5% 3 5% 5% 7% 10% 44%	2546
August	1st to 10th	Day	7% 5% 2 4 6% 3 6% 6% 8% 10% 42%	2328
	11th to 20th	Day	8% 4 3 5% 5% 3 6% 6% 7% 10% 44%	2252
	21st to end	Day	8% 4 2 3 5% 2 4 5% 6% 9% 53%	2376
September	1st to 10th	Day	10% 5% 2 4 4 3 4 4 5% 8% 51%	2160
	11th to 20th	Day	10% 4 2 4 5% 2 4 4 5% 8% 53%	2153
	21st to end	Day	7% 4 2 4 5% 4 4 5% 5% 7% 54%	1882
October	1st to 10th	Day	12% 4 3 6% 4 2 4 3 5% 6% 53%	1800
	11th to 20th	Day	14% 8% 3 4 4 2 3 3 4 6% 51%	1800
	21st to end	Day	17% 8% 3 5% 4 2 3 3 3 5% 47%	1980
November	1st to 10th	Day	11% 6% 3 4 4 2 4 3 4 6% 53%	1801
	11th to 20th	Day	14% 7% 2 5% 3 2 3 3 4 6% 50%	1653
	21st to end	Day	17% 9% 3 6% 4 3 3 3 3 5% 44%	1520
December	1st to 10th	Day	12% 10% 4 6% 4 3 4 4 4 7% 43%	1520
	11th to 20th	Day	13% 10% 4 7% 5% 2 4 3 5% 5% 42%	1918
	21st to end	Day	19% 14% 6% 10% 5% 3 5% 4 5% 5% 24%	2783
January	1st to 10th	Night	11% 10% 7% 11% 7% 3 4 4 3 4 36%	4268
	11th to 20th	Night	13% 10% 5% 8% 5% 5% 6% 5% 5% 4 32%	4120
	21st to end	Night	19% 16% 5% 7% 5% 3 3 3 3 4 31%	4532
February	1st to 10th	Night	15% 9% 5% 7% 7% 3 4 4 4 6% 35%	2470
	11th to 20th	Night	14% 8% 4 6% 5% 2 5% 4 4 6% 42%	2380
	21st to end	Night	15% 10% 4 6% 4 2 3 3 4 6% 43%	1884
March	1st to 10th	Night	14% 9% 3 5% 4 2 3 4 4 5% 47%	2000
	11th to 20th	Night	18% 7% 4 6% 5% 3 5% 4 5% 6% 37%	1980
	21st to end	Night	20% 11% 4 6% 5% 4 5% 5% 5% 5% 29%	2170
April	1st to 10th	Night	11% 7% 3 5% 4 3 4 4 4 7% 48%	1800
	11th to 20th	Night	14% 7% 2 5% 5% 3 4 3 5% 7% 45%	1775
	21st to end	Night	18% 6% 3 5% 5% 2 4 4 4 7% 42%	1800
May	1st to 10th	Night	15% 6% 3 4 6% 2 5% 5% 6% 8% 41%	1635
	11th to 20th	Night	15% 5% 2 7% 4 3 5% 4 5% 7% 44%	1524
	21st to end	Night	11% 5% 3 6% 5% 3 5% 5% 6% 9% 41%	1551
June	1st to 10th	Night	5% 3 1 4 5% 3 4 5% 6% 9% 54%	1440
	11th to 20th	Night	5% 4 2 5% 5% 4 4 5% 7% 11% 48%	1440
	21st to end	Night	3 3 1 3 5% 3 4 6% 5% 10% 58%	1440
July	1st to 10th	Night	9% 4 1 5% 4 2 4 5% 5% 10% 51%	1440
	11th to 20th	Night	4 4 1 3 4 3 3 4 5% 10% 59%	1566
	21st to end	Night	7% 4 2 5% 3 3 4 5% 7% 10% 51%	1772
August	1st to 10th	Night	7% 3 2 4 4 2 5% 5% 7% 10% 51%	1611
	11th to 20th	Night	6% 4 2 4 4 3 3 4 6% 9% 55%	1646
	21st to end	Night	5% 3 2 3 3 3 4 4 6% 8% 58%	1980
September	1st to 10th	Night	11% 4 2 3 4 2 4 4 5% 6% 57%	1800
	11th to 20th	Night	9% 4 1 4 4 3 5% 4 6% 7% 53%	1804
	21st to end	Night	7% 5% 2 4 4 3 4 4 5% 7% 57%	2060
October	1st to 10th	Night	9% 5% 1 4 4 2 3 4 5% 6% 57%	2160
	11th to 20th	Night	15% 4 2 5% 4 3 3 3 4 5% 52%	2160
	21st to end	Night	17% 8% 2 4 4 2 3 3 4 5% 48%	2376
November	1st to 10th	Night	10% 4 2 4 4 2 4 4 4 6% 58%	2275
	11th to 20th	Night	12% 6% 3 5% 5% 2 3 3 4 7% 50%	2524
	21st to end	Night	17% 9% 3 4 4 2 3 4 4 5% 46%	2660
December	1st to 10th	Night	13% 10% 4 5% 5% 3 4 3 4 6% 42%	2660
	11th to 20th	Night	14% 9% 4 6% 5% 3 4 4 4 6% 42%	3279
	21st to end	Night	20% 18% 6% 8% 6% 3 3 4 3 4 26%	4884

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	51% 4 9% 25% 10% 1	2670
	11th to 20th	Day	55% 2 11% 22% 10%	2850
	21st to end	Day	58% 3 10% 16% 12% 2	3135
February	1st to 10th	Day	52% 3 11% 21% 12% 1	1710
	11th to 20th	Day	45% 3 12% 21% 15% 3	1695
	21st to end	Day	47% 3 8% 23% 14% 3	1571
March	1st to 10th	Day	46% 4 10% 25% 13% 3	1980
	11th to 20th	Day	50% 5% 10% 21% 11% 2	1980
	21st to end	Day	57% 5% 11% 18% 8% 1	2186
April	1st to 10th	Day	42% 5% 12% 26% 15% 1	2160
	11th to 20th	Day	45% 4 11% 24% 13% 2	2134
	21st to end	Day	50% 4 12% 21% 12% 1	2160
May	1st to 10th	Day	47% 6% 14% 22% 11% 1	2322
	11th to 20th	Day	45% 6% 12% 23% 13% 1	2372
	21st to end	Day	44% 8% 13% 22% 12% 2	2725
June	1st to 10th	Day	32% 6% 16% 31% 14% 1	2520
	11th to 20th	Day	33% 7% 13% 27% 17% 3	2520
	21st to end	Day	29% 7% 16% 29% 15% 4	2520
July	1st to 10th	Day	33% 7% 15% 27% 15% 3	2451
	11th to 20th	Day	28% 8% 16% 28% 18% 2	2318
	21st to end	Day	34% 7% 12% 32% 14% 1	2405
August	1st to 10th	Day	33% 8% 18% 26% 13% 1	2314
	11th to 20th	Day	34% 6% 11% 33% 15% 1	2252
	21st to end	Day	27% 7% 14% 26% 20% 6%	2376
September	1st to 10th	Day	32% 5% 11% 28% 18% 6%	2160
	11th to 20th	Day	31% 4 9% 27% 25% 4	2153
	21st to end	Day	29% 5% 11% 28% 24% 4	1882
October	1st to 10th	Day	33% 3 11% 26% 23% 4	1800
	11th to 20th	Day	36% 3 8% 27% 21% 4	1800
	21st to end	Day	42% 3 9% 24% 18% 4	1980
November	1st to 10th	Day	33% 3 14% 24% 21% 5%	1801
	11th to 20th	Day	37% 3 10% 26% 21% 3	1653
	21st to end	Day	44% 3 10% 28% 15% 1	1520
December	1st to 10th	Day	43% 4 12% 29% 12% 1	1520
	11th to 20th	Day	45% 3 13% 26% 10% 2	1915
	21st to end	Day	62% 4 10% 16% 8% 1	2783
January	1st to 10th	Night	53% 3 10% 22% 11% 1	4268
	11th to 20th	Night	55% 3 11% 20% 10% 1	4120
	21st to end	Night	58% 2 10% 20% 8% 1	4532
February	1st to 10th	Night	50% 5% 11% 20% 12% 3	2470
	11th to 20th	Night	44% 4 11% 22% 17% 3	2381
	21st to end	Night	45% 3 9% 21% 17% 4	1884
March	1st to 10th	Night	40% 4 10% 26% 18% 3	2000
	11th to 20th	Night	48% 5% 9% 21% 14% 3	1980
	21st to end	Night	56% 5% 12% 18% 8% 1	2170
April	1st to 10th	Night	37% 4 10% 26% 19% 4	1800
	11th to 20th	Night	41% 4 8% 27% 16% 5%	1775
	21st to end	Night	43% 4 11% 23% 18% 2	1800
May	1st to 10th	Night	40% 6% 14% 23% 15% 2	1635
	11th to 20th	Night	39% 6% 13% 23% 17% 1	1525
	21st to end	Night	38% 8% 14% 23% 15% 2	1552
June	1st to 10th	Night	26% 7% 15% 32% 17% 3	1440
	11th to 20th	Night	29% 7% 10% 28% 21% 4	1440
	21st to end	Night	22% 5% 17% 31% 19% 6%	1440
July	1st to 10th	Night	30% 5% 14% 31% 16% 4	1400
	11th to 20th	Night	22% 5% 14% 33% 23% 3	1515
	21st to end	Night	27% 5% 14% 36% 16% 2	1673
August	1st to 10th	Night	27% 8% 16% 31% 16% 2	1601
	11th to 20th	Night	27% 6% 10% 34% 21% 2	1646
	21st to end	Night	24% 5% 13% 28% 24% 7%	1980
September	1st to 10th	Night	28% 4 11% 25% 25% 7%	1800
	11th to 20th	Night	29% 5% 10% 26% 23% 6%	1804
	21st to end	Night	28% 5% 8% 29% 26% 4	2060
October	1st to 10th	Night	29% 4 9% 25% 27% 6%	2160
	11th to 20th	Night	36% 3 6% 27% 21% 6%	2160
	21st to end	Night	40% 4 8% 22% 22% 4	2376
November	1st to 10th	Night	30% 4 12% 27% 21% 6%	2275
	11th to 20th	Night	36% 3 9% 26% 23% 4	2524
	21st to end	Night	43% 3 10% 25% 17% 2	2660
December	1st to 10th	Night	44% 4 12% 26% 13% 1	2660
	11th to 20th	Night	44% 3 11% 28% 13% 1	3281
	21st to end	Night	63% 3 10% 14% 8% 1	4884

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% 15% 35% 23% 7%	270
	11th to 20th	Day	30% 16% 40% 13% 2	270
	21st to end	Day	19% 14% 45% 17% 5%	297
February	1st to 10th	Day	24% 14% 41% 16% 4	270
	11th to 20th	Day	23% 16% 39% 14% 7%	270
	21st to end	Day	23% 20% 39% 15% 4	225
March	1st to 10th	Day	18% 16% 43% 20% 3	240
	11th to 20th	Day	30% 13% 29% 23% 5% 1	240
	21st to end	Day	34% 18% 27% 16% 5%	272
April	1st to 10th	Day	18% 15% 32% 26% 8% 1	420
	11th to 20th	Day	20% 14% 31% 27% 7% 1	412
	21st to end	Day	23% 13% 29% 26% 9% 1	420
May	1st to 10th	Day	18% 11% 31% 29% 10% 1	585
	11th to 20th	Day	21% 9% 24% 28% 15% 4	625
	21st to end	Day	14% 6% 27% 26% 21% 6%	679
June	1st to 10th	Day	8% 3 17% 34% 28% 10%	630
	11th to 20th	Day	10% 2 21% 35% 25% 7%	630
	21st to end	Day	6% 5% 27% 36% 20% 6%	630
July	1st to 10th	Day	10% 3 10% 26% 35% 15%	621
	11th to 20th	Day	6% 2 15% 35% 30% 12%	618
	21st to end	Day	8% 4 10% 35% 35% 9%	684
August	1st to 10th	Day	8% 3 12% 38% 31% 9%	626
	11th to 20th	Day	9% 2 13% 36% 31% 10%	566
	21st to end	Day	11% 1 10% 31% 35% 14%	495
September	1st to 10th	Day	12% 3 12% 30% 33% 10%	450
	11th to 20th	Day	7% 2 15% 37% 27% 12%	443
	21st to end	Day	7% 4 25% 32% 23% 9%	270
October	1st to 10th	Day	16% 7% 30% 24% 16% 7%	270
	11th to 20th	Day	15% 19% 33% 25% 7% 1	270
	21st to end	Day	26% 16% 31% 20% 6% 1	297
November	1st to 10th	Day	13% 10% 39% 23% 9% 4	270
	11th to 20th	Day	17% 16% 29% 27% 9% 2	270
	21st to end	Day	26% 12% 30% 25% 6% 1	270
December	1st to 10th	Day	15% 14% 35% 27% 7% 2	270
	11th to 20th	Day	17% 19% 31% 25% 6% 1	270
	21st to end	Day	23% 20% 38% 19% 2	297
January	1st to 10th	Night	15% 15% 39% 24% 7%	950
	11th to 20th	Night	18% 14% 39% 23% 5% 1	950
	21st to end	Night	17% 13% 40% 28% 3	1045
February	1st to 10th	Night	21% 11% 38% 25% 4	950
	11th to 20th	Night	19% 13% 37% 27% 3	906
	21st to end	Night	22% 14% 39% 21% 4	628
March	1st to 10th	Night	17% 12% 41% 26% 4	556
	11th to 20th	Night	22% 10% 30% 31% 6% 1	540
	21st to end	Night	25% 12% 33% 25% 5%	594
April	1st to 10th	Night	15% 12% 38% 30% 6%	540
	11th to 20th	Night	19% 11% 32% 29% 9%	533
	21st to end	Night	20% 7% 35% 31% 7%	540
May	1st to 10th	Night	17% 6% 31% 36% 9% 1	540
	11th to 20th	Night	17% 3 24% 37% 17% 1	531
	21st to end	Night	14% 4 23% 34% 23% 2	584
June	1st to 10th	Night	7% 1 16% 45% 28% 3	540
	11th to 20th	Night	7% 2 21% 42% 26% 1	540
	21st to end	Night	4 3 20% 52% 21% 1	540
July	1st to 10th	Night	10% 2 9% 37% 38% 4	525
	11th to 20th	Night	6% 2 12% 44% 34% 2	522
	21st to end	Night	7% 2 12% 43% 34% 2	591
August	1st to 10th	Night	7% 2 9% 45% 35% 3	537
	11th to 20th	Night	6% 2 11% 45% 34% 3	534
	21st to end	Night	6% 1 9% 39% 40% 4	594
September	1st to 10th	Night	13% 1 14% 39% 29% 4	540
	11th to 20th	Night	11% 1 15% 40% 28% 5%	540
	21st to end	Night	9% 4 22% 38% 24% 4	620
October	1st to 10th	Night	12% 4 23% 36% 21% 3	720
	11th to 20th	Night	17% 9% 34% 30% 9% 1	720
	21st to end	Night	21% 10% 31% 28% 10%	792
November	1st to 10th	Night	12% 8% 34% 35% 11%	740
	11th to 20th	Night	14% 11% 36% 29% 9%	814
	21st to end	Night	21% 10% 35% 28% 7%	950
December	1st to 10th	Night	18% 10% 38% 27% 6% 1	950
	11th to 20th	Night	23% 9% 31% 31% 6%	950
	21st to end	Night	22% 14% 34% 28% 2	1045

Page generated at 2024-02-27 05:30:18. Version ac07

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