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 2024-10-25.

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% 43%	101140
	Night	12% 8% 3 6% 4 4 4 3 5% 6% 45%	97712
Transparency	Day	40% 4 12% 26% 15% 2	100945
	Night	40% 4 11% 25% 17% 3	97578
Seeing	Day	15% 9% 25% 28% 18% 6%	15639
	Night	15% 8% 29% 33% 14% 1	25436

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 10% 4 4 5% 4 4 7% 33%	2669
	11th to 20th	Day	12% 11% 5% 10% 5% 8% 4 3 3 4 35%	2850
	21st to end	Day	17% 17% 5% 8% 4 3 4 3 4 5% 30%	3135
February	1st to 10th	Day	17% 9% 4 9% 6% 3 4 2 5% 6% 34%	1710
	11th to 20th	Day	14% 10% 4 6% 4 4 4 3 5% 5% 41%	1686
	21st to end	Day	15% 11% 4 7% 5% 3 4 3 5% 5% 39%	1571
March	1st to 10th	Day	17% 10% 3 5% 3 2 3 2 3 5% 45%	3436
	11th to 20th	Day	12% 7% 2 5% 3 3 3 3 5% 7% 49%	3480
	21st to end	Day	17% 13% 4 8% 5% 4 4 3 5% 6% 31%	3835
April	1st to 10th	Day	14% 7% 3 7% 5% 4 3 3 6% 6% 43%	2280
	11th to 20th	Day	16% 9% 2 6% 4 4 5% 3 5% 6% 41%	2254
	21st to end	Day	20% 7% 2 6% 4 4 5% 4 5% 6% 35%	2280
May	1st to 10th	Day	13% 8% 3 7% 5% 4 4 5% 7% 9% 35%	4050
	11th to 20th	Day	16% 9% 3 6% 4 4 4 3 5% 7% 39%	4204
	21st to end	Day	11% 7% 2 6% 5% 5% 5% 4 5% 7% 44%	4824
June	1st to 10th	Day	7% 4 2 5% 5% 5% 5% 4 7% 10% 46%	2660
	11th to 20th	Day	8% 5% 2 6% 4 4 4 4 6% 8% 48%	2660
	21st to end	Day	6% 5% 2 5% 5% 4 5% 4 7% 10% 49%	2660
July	1st to 10th	Day	13% 6% 2 6% 4 4 4 4 6% 9% 41%	4440
	11th to 20th	Day	6% 4 2 5% 4 4 5% 4 6% 9% 51%	4198
	21st to end	Day	7% 5% 2 6% 5% 5% 5% 5% 8% 10% 43%	4465
August	1st to 10th	Day	4 4 2 4 4 4 5% 4 8% 11% 50%	4104
	11th to 20th	Day	11% 5% 2 5% 4 5% 4 4 6% 8% 45%	3950
	21st to end	Day	6% 4 2 4 4 3 4 4 7% 9% 53%	4180
September	1st to 10th	Day	10% 5% 2 4 4 4 4 2 5% 8% 52%	2280
	11th to 20th	Day	9% 5% 2 6% 4 3 4 3 5% 8% 51%	2272
	21st to end	Day	7% 5% 2 6% 4 4 4 4 5% 7% 52%	1986
October	1st to 10th	Day	11% 4 2 6% 3 2 3 3 5% 5% 55%	1900
	11th to 20th	Day	13% 8% 2 4 3 2 3 2 3 6% 53%	1900
	21st to end	Day	17% 8% 3 6% 3 3 3 2 3 6% 47%	2026
November	1st to 10th	Day	11% 7% 2 5% 3 3 3 3 5% 6% 53%	1801
	11th to 20th	Day	14% 7% 2 6% 3 3 3 3 4 6% 49%	1653
	21st to end	Day	17% 10% 2 6% 3 3 3 2 4 5% 44%	1520
December	1st to 10th	Day	12% 10% 3 6% 4 4 4 3 4 7% 42%	1520
	11th to 20th	Day	13% 11% 3 8% 5% 3 4 3 5% 5% 42%	1918
	21st to end	Day	19% 15% 6% 11% 4 4 5% 3 5% 5% 24%	2783
January	1st to 10th	Night	10% 10% 6% 13% 5% 5% 4 3 3 4 36%	4268
	11th to 20th	Night	13% 10% 5% 10% 4 7% 5% 4 5% 4 32%	4120
	21st to end	Night	19% 16% 5% 8% 4 4 3 2 3 4 31%	4532
February	1st to 10th	Night	15% 10% 4 8% 6% 4 4 4 5% 6% 35%	2470
	11th to 20th	Night	14% 9% 4 6% 4 3 5% 3 4 6% 42%	2380
	21st to end	Night	15% 11% 4 6% 4 3 3 2 4 5% 43%	1884
March	1st to 10th	Night	17% 11% 2 6% 3 3 3 3 4 4 44%	3433
	11th to 20th	Night	13% 7% 2 5% 3 3 3 3 5% 6% 51%	3480
	21st to end	Night	17% 13% 4 8% 5% 5% 5% 3 4 5% 31%	3796
April	1st to 10th	Night	11% 7% 2 6% 4 4 3 4 4 7% 48%	1900
	11th to 20th	Night	14% 7% 2 6% 4 4 4 2 5% 7% 45%	1875
	21st to end	Night	18% 6% 3 6% 4 3 4 3 4 6% 42%	1900
May	1st to 10th	Night	15% 8% 3 6% 4 4 4 4 6% 7% 39%	2838
	11th to 20th	Night	13% 7% 3 8% 4 4 4 3 5% 9% 41%	2698
	21st to end	Night	10% 5% 2 6% 3 4 5% 3 6% 8% 49%	2743
June	1st to 10th	Night	6% 3 1 5% 4 3 4 4 6% 9% 53%	1520
	11th to 20th	Night	5% 4 2 6% 5% 4 4 4 7% 11% 49%	1520
	21st to end	Night	3 3 1 4 4 4 4 4 6% 10% 56%	1520
July	1st to 10th	Night	12% 7% 2 6% 3 3 4 3 4 9% 45%	2530
	11th to 20th	Night	3 3 1 4 3 4 3 4 6% 10% 59%	2754
	21st to end	Night	5% 4 2 6% 4 4 5% 4 7% 10% 48%	3098
August	1st to 10th	Night	4 2 1 3 3 3 5% 3 6% 9% 61%	2836
	11th to 20th	Night	11% 5% 2 5% 3 3 3 4 5% 8% 50%	2883
	21st to end	Night	4 3 1 4 3 4 4 4 6% 8% 58%	3476
September	1st to 10th	Night	10% 4 2 4 3 3 3 3 5% 6% 59%	1900
	11th to 20th	Night	9% 4 1 5% 3 4 5% 3 6% 7% 53%	1905
	21st to end	Night	7% 5% 2 5% 3 3 3 3 5% 6% 56%	2175
October	1st to 10th	Night	9% 5% 1 4 3 3 3 3 5% 6% 59%	2280
	11th to 20th	Night	15% 4 2 5% 3 3 3 2 4 5% 54%	2280
	21st to end	Night	16% 9% 2 5% 3 3 3 3 4 5% 48%	2436
November	1st to 10th	Night	10% 5% 2 4 4 3 3 3 3 6% 57%	2275
	11th to 20th	Night	11% 7% 2 6% 5% 3 3 3 4 6% 50%	2524
	21st to end	Night	16% 10% 2 5% 4 3 3 3 4 5% 46%	2660
December	1st to 10th	Night	13% 11% 4 6% 4 3 3 3 5% 6% 42%	2660
	11th to 20th	Night	14% 10% 3 6% 4 4 4 3 4 6% 42%	3279
	21st to end	Night	20% 18% 5% 9% 4 3 3 3 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% 15% 3	1571
March	1st to 10th	Day	43% 3 8% 25% 19% 2	3436
	11th to 20th	Day	34% 4 12% 29% 16% 4	3480
	21st to end	Day	54% 5% 17% 18% 6%	3835
April	1st to 10th	Day	42% 4 11% 26% 15% 2	2280
	11th to 20th	Day	44% 4 11% 25% 14% 2	2254
	21st to end	Day	49% 4 12% 22% 12% 1	2280
May	1st to 10th	Day	44% 6% 14% 23% 11% 1	4088
	11th to 20th	Day	46% 6% 11% 26% 11%	4208
	21st to end	Day	38% 6% 10% 29% 16% 1	4837
June	1st to 10th	Day	31% 6% 16% 30% 15% 1	2660
	11th to 20th	Day	32% 7% 13% 28% 17% 3	2660
	21st to end	Day	30% 6% 16% 29% 15% 4	2660
July	1st to 10th	Day	41% 4 11% 25% 16% 2	4371
	11th to 20th	Day	30% 5% 13% 33% 18% 1	4126
	21st to end	Day	35% 4 19% 29% 12% 1	4325
August	1st to 10th	Day	27% 5% 17% 34% 16% 1	4090
	11th to 20th	Day	37% 4 13% 30% 15% 1	3989
	21st to end	Day	28% 4 16% 34% 14% 4	4179
September	1st to 10th	Day	31% 5% 11% 27% 21% 6%	2280
	11th to 20th	Day	32% 4 9% 27% 24% 4	2272
	21st to end	Day	31% 5% 10% 27% 24% 4	1986
October	1st to 10th	Day	32% 3 10% 26% 26% 4	1900
	11th to 20th	Day	35% 3 8% 27% 23% 5%	1900
	21st to end	Day	41% 3 9% 24% 19% 4	2026
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% 18% 4	1884
March	1st to 10th	Night	44% 3 9% 23% 18% 3	3433
	11th to 20th	Night	35% 4 9% 25% 24% 4	3480
	21st to end	Night	55% 4 12% 23% 5% 1	3796
April	1st to 10th	Night	37% 4 10% 26% 19% 4	1900
	11th to 20th	Night	40% 4 7% 27% 17% 5%	1875
	21st to end	Night	43% 4 11% 23% 17% 2	1900
May	1st to 10th	Night	44% 5% 15% 19% 15% 1	2865
	11th to 20th	Night	41% 5% 13% 29% 11% 1	2699
	21st to end	Night	31% 7% 13% 23% 24% 2	2751
June	1st to 10th	Night	27% 7% 14% 31% 17% 4	1520
	11th to 20th	Night	28% 7% 11% 28% 22% 4	1520
	21st to end	Night	23% 5% 16% 30% 20% 6%	1520
July	1st to 10th	Night	39% 3 10% 28% 16% 3	2490
	11th to 20th	Night	23% 3 12% 39% 21% 2	2703
	21st to end	Night	31% 3 21% 32% 13% 1	2999
August	1st to 10th	Night	20% 4 20% 31% 23% 2	2826
	11th to 20th	Night	35% 3 11% 29% 20% 2	2910
	21st to end	Night	25% 3 15% 37% 16% 4	3476
September	1st to 10th	Night	27% 4 11% 24% 26% 8%	1900
	11th to 20th	Night	30% 5% 10% 26% 24% 6%	1905
	21st to end	Night	29% 4 7% 28% 26% 4	2175
October	1st to 10th	Night	27% 4 9% 25% 29% 6%	2280
	11th to 20th	Night	35% 3 6% 27% 23% 7%	2280
	21st to end	Night	39% 4 8% 22% 23% 4	2436
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	22% 20% 40% 15% 4	225
March	1st to 10th	Day	18% 17% 41% 20% 4	270
	11th to 20th	Day	27% 14% 32% 22% 4 1	270
	21st to end	Day	32% 19% 27% 17% 5%	306
April	1st to 10th	Day	18% 16% 31% 25% 8% 1	460
	11th to 20th	Day	20% 15% 32% 26% 7% 1	452
	21st to end	Day	22% 13% 29% 26% 8% 1	460
May	1st to 10th	Day	17% 11% 32% 29% 9% 1	634
	11th to 20th	Day	20% 9% 22% 29% 16% 4	675
	21st to end	Day	13% 7% 28% 26% 20% 6%	734
June	1st to 10th	Day	8% 3 19% 35% 27% 10%	680
	11th to 20th	Day	10% 2 22% 36% 24% 6%	680
	21st to end	Day	5% 5% 29% 36% 19% 6%	680
July	1st to 10th	Day	11% 3 12% 27% 33% 14%	671
	11th to 20th	Day	6% 2 15% 36% 29% 12%	668
	21st to end	Day	8% 4 10% 34% 34% 10%	739
August	1st to 10th	Day	7% 3 14% 38% 30% 8%	676
	11th to 20th	Day	10% 2 14% 36% 29% 9%	613
	21st to end	Day	11% 1 10% 31% 35% 13%	539
September	1st to 10th	Day	11% 3 12% 30% 33% 11%	490
	11th to 20th	Day	7% 1 15% 37% 28% 12%	482
	21st to end	Day	9% 3 26% 31% 21% 9%	300
October	1st to 10th	Day	15% 6% 29% 25% 17% 8%	300
	11th to 20th	Day	14% 18% 31% 26% 9% 2	300
	21st to end	Day	26% 16% 31% 20% 7% 1	311
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% 25% 4	584
	11th to 20th	Night	21% 10% 31% 32% 5% 1	570
	21st to end	Night	25% 12% 33% 25% 5%	627
April	1st to 10th	Night	14% 13% 38% 29% 5%	570
	11th to 20th	Night	19% 11% 32% 29% 9%	563
	21st to end	Night	19% 8% 34% 31% 7%	570
May	1st to 10th	Night	17% 6% 32% 36% 9% 1	570
	11th to 20th	Night	17% 3 24% 38% 18% 1	561
	21st to end	Night	14% 4 24% 34% 22% 2	617
June	1st to 10th	Night	7% 2 16% 45% 27% 3	570
	11th to 20th	Night	7% 2 21% 44% 26% 1	570
	21st to end	Night	4 3 21% 51% 21% 1	570
July	1st to 10th	Night	11% 2 9% 38% 36% 4	555
	11th to 20th	Night	5% 2 12% 46% 33% 2	552
	21st to end	Night	7% 2 12% 43% 35% 2	624
August	1st to 10th	Night	7% 2 9% 44% 35% 2	567
	11th to 20th	Night	7% 2 11% 46% 32% 3	564
	21st to end	Night	6% 1 9% 39% 41% 4	627
September	1st to 10th	Night	12% 1 14% 39% 30% 4	570
	11th to 20th	Night	11% 1 15% 40% 28% 4	570
	21st to end	Night	9% 4 22% 38% 23% 4	655
October	1st to 10th	Night	11% 4 23% 36% 22% 3	760
	11th to 20th	Night	17% 8% 34% 31% 10% 1	760
	21st to end	Night	20% 10% 31% 28% 10%	812
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 2024-10-22 19:21:00. Version ac07

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