Avon Park Bombing Range
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Avon Park Bombing Range clear sky chart from 2005-11-06 to 2024-03-23.

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	8% 6% 3 7% 7% 5% 7% 6% 7% 9% 36%	79129
	Night	8% 6% 3 6% 6% 4 5% 6% 6% 9% 42%	80760
Transparency	Day	41% 11% 15% 16% 13% 4	78852
	Night	36% 11% 16% 19% 13% 5%	80556
Seeing	Day	8% 4 16% 25% 25% 23%	14813
	Night	8% 3 17% 34% 29% 9%	24988

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	8% 7% 3 7% 6% 3 5% 5% 6% 7% 42%	2836
	11th to 20th	Day	16% 8% 3 7% 5% 3 5% 5% 6% 9% 32%	2840
	21st to end	Day	8% 7% 3 7% 7% 4 5% 5% 7% 7% 41%	3216
February	1st to 10th	Day	10% 5% 2 5% 6% 3 4 5% 7% 8% 44%	1900
	11th to 20th	Day	5% 4 2 4 5% 3 4 6% 6% 7% 53%	1851
	21st to end	Day	7% 5% 3 5% 6% 2 5% 4 6% 8% 50%	1727
March	1st to 10th	Day	4 4 2 5% 5% 4 5% 6% 6% 9% 51%	2090
	11th to 20th	Day	5% 3 2 4 5% 3 6% 6% 6% 9% 50%	2090
	21st to end	Day	6% 3 2 5% 5% 4 6% 5% 6% 8% 51%	2200
April	1st to 10th	Day	5% 3 3 5% 5% 4 7% 7% 7% 9% 45%	1980
	11th to 20th	Day	8% 5% 2 5% 7% 5% 7% 7% 6% 8% 39%	2003
	21st to end	Day	5% 4 2 5% 6% 4 6% 6% 7% 9% 48%	2160
May	1st to 10th	Day	4 4 1 5% 5% 3 4 7% 6% 9% 52%	2193
	11th to 20th	Day	7% 6% 3 6% 7% 5% 8% 7% 7% 9% 37%	2301
	21st to end	Day	7% 7% 3 7% 8% 5% 8% 7% 6% 9% 33%	2531
June	1st to 10th	Day	12% 10% 4 9% 8% 5% 7% 7% 7% 9% 20%	2340
	11th to 20th	Day	7% 6% 3 9% 9% 6% 9% 9% 8% 10% 25%	2340
	21st to end	Day	8% 7% 4 9% 9% 6% 8% 7% 7% 10% 24%	2340
July	1st to 10th	Day	9% 6% 4 9% 10% 6% 9% 8% 8% 10% 21%	2340
	11th to 20th	Day	7% 6% 4 9% 9% 6% 9% 7% 9% 10% 23%	2340
	21st to end	Day	7% 6% 4 9% 10% 6% 9% 9% 8% 10% 21%	2547
August	1st to 10th	Day	6% 5% 2 9% 10% 5% 9% 9% 9% 13% 24%	2327
	11th to 20th	Day	5% 5% 4 8% 10% 6% 9% 9% 8% 12% 25%	2166
	21st to end	Day	8% 8% 4 10% 11% 6% 8% 8% 8% 8% 22%	2178
September	1st to 10th	Day	7% 6% 4 8% 10% 6% 9% 8% 9% 10% 24%	1980
	11th to 20th	Day	8% 6% 4 9% 10% 7% 9% 8% 8% 9% 21%	1980
	21st to end	Day	8% 8% 3 9% 8% 4 8% 8% 9% 9% 26%	1980
October	1st to 10th	Day	8% 6% 3 6% 8% 5% 7% 6% 8% 9% 33%	1939
	11th to 20th	Day	6% 5% 2 7% 7% 4 6% 6% 8% 8% 41%	1800
	21st to end	Day	7% 5% 2 6% 6% 4 5% 5% 6% 9% 45%	1980
November	1st to 10th	Day	7% 5% 2 5% 5% 4 6% 5% 7% 8% 46%	1857
	11th to 20th	Day	9% 6% 2 7% 7% 5% 6% 5% 5% 8% 40%	1900
	21st to end	Day	8% 6% 3 7% 6% 3 6% 5% 6% 8% 42%	1890
December	1st to 10th	Day	6% 5% 2 6% 6% 4 5% 5% 6% 9% 46%	1710
	11th to 20th	Day	9% 6% 3 6% 7% 3 5% 6% 6% 7% 43%	2153
	21st to end	Day	9% 6% 4 8% 8% 5% 7% 7% 6% 8% 34%	3124
January	1st to 10th	Night	10% 7% 3 6% 6% 4 5% 5% 6% 9% 39%	4109
	11th to 20th	Night	17% 13% 3 8% 6% 3 4 4 5% 8% 30%	4120
	21st to end	Night	9% 6% 3 6% 6% 4 6% 5% 7% 7% 41%	4436
February	1st to 10th	Night	9% 6% 3 6% 5% 3 5% 5% 5% 9% 44%	2280
	11th to 20th	Night	9% 4 2 4 4 2 4 5% 5% 8% 52%	2214
	21st to end	Night	6% 4 2 3 4 3 4 4 6% 9% 54%	1727
March	1st to 10th	Night	4 3 1 5% 5% 3 5% 3 5% 8% 57%	2090
	11th to 20th	Night	5% 3 2 4 5% 3 5% 5% 6% 8% 55%	2090
	21st to end	Night	4 3 2 4 4 3 4 4 5% 7% 59%	2201
April	1st to 10th	Night	3 3 2 4 4 3 4 4 6% 8% 57%	1980
	11th to 20th	Night	5% 4 2 5% 4 4 6% 4 6% 11% 49%	1903
	21st to end	Night	5% 4 2 4 5% 3 5% 4 6% 7% 55%	1800
May	1st to 10th	Night	6% 3 2 3 5% 3 4 4 5% 8% 60%	1780
	11th to 20th	Night	6% 4 2 6% 6% 4 5% 6% 7% 10% 44%	1592
	21st to end	Night	5% 5% 3 5% 6% 4 5% 6% 8% 9% 43%	1744
June	1st to 10th	Night	10% 7% 4 7% 8% 5% 6% 7% 6% 10% 31%	1620
	11th to 20th	Night	6% 6% 4 6% 7% 5% 7% 6% 10% 13% 30%	1620
	21st to end	Night	7% 5% 3 7% 6% 4 7% 7% 8% 12% 33%	1620
July	1st to 10th	Night	11% 7% 3 6% 7% 4 6% 6% 9% 10% 30%	1620
	11th to 20th	Night	6% 6% 3 6% 7% 5% 7% 8% 8% 11% 33%	1620
	21st to end	Night	5% 7% 3 8% 9% 5% 8% 8% 8% 11% 30%	1771
August	1st to 10th	Night	5% 5% 2 6% 7% 4 6% 9% 10% 12% 34%	1611
	11th to 20th	Night	5% 5% 3 7% 8% 5% 7% 8% 9% 12% 32%	1707
	21st to end	Night	9% 7% 4 8% 7% 5% 5% 7% 7% 12% 28%	2178
September	1st to 10th	Night	6% 6% 3 8% 8% 4 8% 9% 8% 13% 27%	1980
	11th to 20th	Night	8% 7% 4 10% 8% 5% 6% 7% 7% 11% 29%	1980
	21st to end	Night	11% 6% 4 8% 7% 4 5% 6% 8% 9% 31%	1980
October	1st to 10th	Night	9% 6% 3 6% 6% 4 5% 6% 6% 10% 39%	2020
	11th to 20th	Night	6% 6% 3 6% 5% 3 6% 4 6% 9% 47%	2160
	21st to end	Night	9% 5% 2 5% 5% 2 4 5% 5% 8% 49%	2376
November	1st to 10th	Night	7% 5% 3 5% 5% 3 5% 5% 5% 8% 49%	2221
	11th to 20th	Night	7% 4 3 6% 6% 3 4 6% 6% 7% 47%	2280
	21st to end	Night	9% 5% 3 5% 6% 3 5% 5% 6% 8% 46%	2286
December	1st to 10th	Night	7% 5% 3 4 5% 3 5% 5% 6% 8% 50%	2470
	11th to 20th	Night	11% 7% 3 6% 4 3 4 4 4 7% 47%	3042
	21st to end	Night	11% 7% 3 7% 7% 4 6% 6% 6% 8% 35%	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% 8% 7% 18% 22% 7%	2837
	11th to 20th	Day	47% 7% 8% 17% 17% 4	2840
	21st to end	Day	39% 8% 8% 19% 19% 7%	3216
February	1st to 10th	Day	36% 6% 11% 19% 21% 8%	1900
	11th to 20th	Day	27% 7% 12% 22% 21% 11%	1861
	21st to end	Day	32% 6% 10% 18% 25% 9%	1727
March	1st to 10th	Day	27% 7% 13% 22% 23% 8%	2090
	11th to 20th	Day	28% 8% 12% 26% 18% 8%	2090
	21st to end	Day	29% 7% 11% 24% 20% 9%	2200
April	1st to 10th	Day	31% 9% 15% 22% 16% 6%	1980
	11th to 20th	Day	39% 9% 12% 18% 18% 5%	2003
	21st to end	Day	30% 8% 12% 20% 22% 7%	2160
May	1st to 10th	Day	26% 8% 14% 20% 23% 8%	2193
	11th to 20th	Day	40% 11% 14% 18% 15% 1	2305
	21st to end	Day	45% 10% 13% 17% 14% 1	2531
June	1st to 10th	Day	56% 12% 16% 12% 4	2340
	11th to 20th	Day	49% 14% 20% 15% 3	2340
	21st to end	Day	52% 15% 20% 11% 2	2340
July	1st to 10th	Day	53% 17% 23% 6% 1	2275
	11th to 20th	Day	50% 17% 24% 9%	2271
	21st to end	Day	52% 17% 20% 10% 1	2405
August	1st to 10th	Day	45% 19% 29% 7% 1	2314
	11th to 20th	Day	45% 19% 26% 9% 1	2166
	21st to end	Day	55% 16% 20% 8% 2	2178
September	1st to 10th	Day	49% 17% 21% 12% 1	1980
	11th to 20th	Day	53% 17% 17% 10% 2	1980
	21st to end	Day	48% 15% 16% 11% 8% 1	1980
October	1st to 10th	Day	42% 12% 14% 17% 11% 5%	1939
	11th to 20th	Day	37% 9% 12% 21% 17% 4	1800
	21st to end	Day	33% 7% 13% 18% 19% 9%	1980
November	1st to 10th	Day	33% 8% 14% 17% 17% 11%	1857
	11th to 20th	Day	40% 8% 10% 20% 15% 7%	1900
	21st to end	Day	37% 7% 12% 20% 18% 6%	1890
December	1st to 10th	Day	34% 7% 15% 23% 17% 5%	1710
	11th to 20th	Day	37% 9% 11% 18% 15% 11%	2150
	21st to end	Day	43% 10% 14% 16% 13% 5%	3124
January	1st to 10th	Night	39% 9% 11% 21% 16% 4	4109
	11th to 20th	Night	52% 6% 9% 20% 10% 4	4120
	21st to end	Night	38% 9% 10% 18% 17% 8%	4436
February	1st to 10th	Night	36% 7% 12% 18% 19% 8%	2280
	11th to 20th	Night	27% 7% 12% 22% 22% 10%	2215
	21st to end	Night	25% 7% 13% 22% 26% 8%	1727
March	1st to 10th	Night	24% 7% 13% 26% 23% 7%	2090
	11th to 20th	Night	25% 8% 15% 28% 17% 7%	2090
	21st to end	Night	22% 7% 15% 27% 22% 7%	2201
April	1st to 10th	Night	23% 7% 19% 28% 15% 7%	1980
	11th to 20th	Night	28% 8% 18% 22% 20% 4	1903
	21st to end	Night	27% 7% 13% 25% 22% 6%	1800
May	1st to 10th	Night	22% 7% 14% 27% 21% 9%	1780
	11th to 20th	Night	31% 12% 21% 22% 12% 1	1593
	21st to end	Night	33% 12% 16% 23% 16%	1745
June	1st to 10th	Night	45% 12% 22% 16% 4	1620
	11th to 20th	Night	40% 15% 23% 19% 3	1620
	21st to end	Night	40% 18% 23% 14% 4	1620
July	1st to 10th	Night	44% 18% 25% 11% 2	1575
	11th to 20th	Night	41% 19% 28% 11% 1	1566
	21st to end	Night	42% 20% 25% 13% 1	1672
August	1st to 10th	Night	36% 20% 33% 11%	1600
	11th to 20th	Night	37% 20% 34% 8% 1	1707
	21st to end	Night	46% 17% 25% 10% 1	2178
September	1st to 10th	Night	42% 20% 24% 12% 1	1980
	11th to 20th	Night	47% 15% 22% 15% 2	1980
	21st to end	Night	45% 13% 19% 13% 8% 1	1980
October	1st to 10th	Night	38% 12% 16% 18% 13% 4	2020
	11th to 20th	Night	34% 8% 14% 19% 21% 4	2160
	21st to end	Night	31% 8% 14% 19% 19% 9%	2376
November	1st to 10th	Night	30% 9% 13% 20% 20% 9%	2221
	11th to 20th	Night	32% 9% 12% 25% 14% 7%	2280
	21st to end	Night	34% 8% 11% 21% 20% 6%	2286
December	1st to 10th	Night	30% 7% 15% 28% 14% 6%	2470
	11th to 20th	Night	35% 7% 12% 19% 15% 12%	3044
	21st to end	Night	43% 12% 12% 16% 13% 5%	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	8% 7% 39% 26% 17% 3	270
	11th to 20th	Day	9% 10% 32% 31% 13% 6%	270
	21st to end	Day	11% 10% 43% 26% 9% 1	297
February	1st to 10th	Day	10% 10% 26% 34% 19% 2	270
	11th to 20th	Day	7% 5% 33% 32% 17% 6%	273
	21st to end	Day	8% 5% 21% 37% 24% 5%	382
March	1st to 10th	Day	5% 6% 31% 38% 18% 2	460
	11th to 20th	Day	6% 6% 26% 30% 27% 4	460
	21st to end	Day	5% 5% 24% 33% 27% 6%	470
April	1st to 10th	Day	4 7% 28% 34% 21% 6%	420
	11th to 20th	Day	7% 5% 23% 34% 23% 9%	412
	21st to end	Day	7% 3 17% 34% 26% 14%	420
May	1st to 10th	Day	6% 1 16% 26% 34% 17%	423
	11th to 20th	Day	9% 3 13% 26% 29% 20%	447
	21st to end	Day	8% 2 7% 21% 30% 32%	485
June	1st to 10th	Day	15% 3 10% 17% 29% 26%	450
	11th to 20th	Day	6% 1 6% 13% 32% 41%	450
	21st to end	Day	5% 2 4 15% 21% 53%	450
July	1st to 10th	Day	8% 2 2 7% 22% 59%	445
	11th to 20th	Day	4 1 4 10% 27% 55%	444
	21st to end	Day	9% 1 6% 13% 20% 51%	488
August	1st to 10th	Day	6% 1 4 11% 24% 55%	446
	11th to 20th	Day	3 1 2 11% 25% 59%	439
	21st to end	Day	11% 1 7% 16% 23% 43%	495
September	1st to 10th	Day	7% 2 5% 14% 22% 50%	450
	11th to 20th	Day	8% 3 7% 15% 28% 39%	450
	21st to end	Day	9% 1 6% 20% 31% 34%	450
October	1st to 10th	Day	12% 2 11% 30% 34% 12%	450
	11th to 20th	Day	5% 2 15% 33% 32% 12%	450
	21st to end	Day	8% 3 16% 31% 33% 9%	495
November	1st to 10th	Day	8% 5% 17% 33% 28% 9%	455
	11th to 20th	Day	12% 4 22% 35% 22% 5%	460
	21st to end	Day	8% 3 21% 38% 25% 5%	450
December	1st to 10th	Day	5% 6% 29% 32% 17% 10%	270
	11th to 20th	Day	9% 9% 26% 34% 17% 6%	270
	21st to end	Day	7% 7% 26% 36% 20% 5%	297
January	1st to 10th	Night	11% 6% 27% 39% 17% 1	760
	11th to 20th	Night	11% 6% 28% 40% 14% 1	760
	21st to end	Night	13% 7% 31% 38% 12%	836
February	1st to 10th	Night	12% 7% 26% 41% 13%	760
	11th to 20th	Night	9% 6% 27% 42% 15% 1	743
	21st to end	Night	7% 4 27% 48% 14%	628
March	1st to 10th	Night	5% 6% 33% 43% 13%	760
	11th to 20th	Night	6% 5% 27% 43% 18% 1	760
	21st to end	Night	6% 3 28% 46% 17%	801
April	1st to 10th	Night	4 3 27% 48% 17%	720
	11th to 20th	Night	7% 4 26% 44% 19% 1	711
	21st to end	Night	6% 2 23% 47% 21% 1	720
May	1st to 10th	Night	7% 2 18% 49% 22% 2	700
	11th to 20th	Night	8% 11% 41% 34% 4	531
	21st to end	Night	6% 2 7% 32% 46% 8%	584
June	1st to 10th	Night	11% 2 6% 26% 47% 8%	540
	11th to 20th	Night	6% 1 4 18% 48% 23%	540
	21st to end	Night	7% 1 2 14% 46% 29%	540
July	1st to 10th	Night	10% 1 4 6% 47% 31%	525
	11th to 20th	Night	6% 2 9% 47% 37%	522
	21st to end	Night	4 2 12% 46% 36%	591
August	1st to 10th	Night	6% 1 3 9% 51% 31%	537
	11th to 20th	Night	7% 1 3 11% 45% 34%	619
	21st to end	Night	10% 1 6% 20% 39% 24%	792
September	1st to 10th	Night	8% 2 5% 17% 43% 24%	720
	11th to 20th	Night	10% 2 6% 22% 44% 18%	720
	21st to end	Night	14% 2 6% 24% 40% 13%	720
October	1st to 10th	Night	13% 2 11% 37% 31% 6%	720
	11th to 20th	Night	7% 3 11% 35% 39% 4	720
	21st to end	Night	12% 2 15% 37% 30% 4	792
November	1st to 10th	Night	8% 4 20% 39% 27% 3	740
	11th to 20th	Night	8% 3 21% 43% 22% 3	760
	21st to end	Night	9% 3 22% 45% 21% 1	760
December	1st to 10th	Night	7% 3 21% 39% 27% 2	760
	11th to 20th	Night	9% 6% 20% 39% 23% 2	760
	21st to end	Night	9% 4 22% 40% 23% 1	836

Page generated at 2024-03-19 23:31:07. Version ac07

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