Vero Beach
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Vero Beach clear sky chart from 2005-11-06 to 2024-01-15.

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% 5% 3 6% 6% 4 7% 7% 8% 11% 36%	74930
	Night	8% 5% 3 6% 6% 4 6% 6% 7% 10% 40%	74862
Transparency	Day	29% 37% 11% 13% 9% 2	74653
	Night	27% 37% 11% 14% 9% 3	74658
Seeing	Day	8% 2 8% 23% 33% 25%	14720
	Night	9% 3 11% 27% 34% 16%	24874

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	9% 5% 2 6% 6% 4 6% 6% 7% 8% 42%	1706
	11th to 20th	Day	8% 5% 2 5% 6% 4 6% 6% 7% 9% 41%	1662
	21st to end	Day	11% 5% 3 5% 6% 4 6% 5% 6% 9% 40%	1782
February	1st to 10th	Day	9% 6% 3 5% 5% 3 5% 5% 8% 8% 43%	1778
	11th to 20th	Day	7% 3 2 4 3 3 6% 5% 6% 9% 53%	1815
	21st to end	Day	8% 4 3 4 4 3 5% 6% 5% 9% 50%	1628
March	1st to 10th	Day	4 4 3 5% 6% 3 5% 5% 6% 9% 50%	1980
	11th to 20th	Day	6% 3 2 4 6% 2 5% 5% 6% 10% 51%	1980
	21st to end	Day	6% 4 2 4 5% 3 5% 6% 5% 10% 51%	2178
April	1st to 10th	Day	4 3 2 5% 5% 4 6% 6% 8% 10% 47%	1980
	11th to 20th	Day	8% 4 3 5% 5% 4 7% 7% 8% 11% 39%	2061
	21st to end	Day	5% 4 3 5% 5% 4 5% 6% 7% 10% 47%	2160
May	1st to 10th	Day	5% 2 2 3 3 3 5% 6% 6% 11% 54%	2160
	11th to 20th	Day	8% 6% 3 6% 6% 4 7% 7% 8% 10% 36%	2239
	21st to end	Day	8% 5% 3 7% 6% 5% 7% 8% 8% 10% 33%	2531
June	1st to 10th	Day	10% 8% 4 9% 9% 6% 8% 7% 8% 10% 21%	2340
	11th to 20th	Day	6% 5% 3 5% 7% 4 8% 10% 10% 13% 28%	2340
	21st to end	Day	7% 5% 3 7% 7% 5% 7% 8% 9% 15% 27%	2340
July	1st to 10th	Day	8% 6% 3 6% 8% 5% 7% 8% 10% 12% 27%	2340
	11th to 20th	Day	7% 5% 3 6% 7% 4 8% 10% 10% 14% 27%	2340
	21st to end	Day	7% 5% 4 8% 8% 4 9% 8% 10% 11% 27%	2547
August	1st to 10th	Day	6% 4 2 6% 6% 4 8% 9% 9% 15% 31%	2327
	11th to 20th	Day	5% 5% 2 5% 7% 4 9% 9% 9% 14% 31%	2135
	21st to end	Day	8% 5% 3 7% 8% 6% 8% 7% 9% 12% 26%	2265
September	1st to 10th	Day	6% 5% 2 7% 9% 6% 9% 9% 11% 13% 24%	1980
	11th to 20th	Day	8% 6% 3 6% 8% 5% 8% 9% 9% 11% 26%	1980
	21st to end	Day	9% 6% 3 8% 9% 5% 7% 8% 9% 10% 26%	1980
October	1st to 10th	Day	10% 7% 2 7% 6% 4 7% 7% 8% 10% 32%	1886
	11th to 20th	Day	8% 5% 3 6% 6% 4 6% 8% 8% 11% 35%	1800
	21st to end	Day	9% 4 2 5% 5% 3 6% 7% 8% 10% 41%	1980
November	1st to 10th	Day	9% 5% 2 6% 7% 4 7% 5% 7% 10% 38%	1857
	11th to 20th	Day	10% 6% 3 8% 8% 4 6% 7% 7% 9% 34%	1900
	21st to end	Day	8% 5% 2 6% 6% 4 7% 6% 6% 10% 39%	1900
December	1st to 10th	Day	9% 4 3 6% 5% 3 5% 6% 7% 10% 42%	1776
	11th to 20th	Day	9% 7% 4 6% 6% 4 6% 5% 4 9% 41%	2153
	21st to end	Day	11% 6% 3 6% 8% 5% 7% 6% 7% 8% 32%	3124
January	1st to 10th	Night	9% 5% 2 5% 5% 3 5% 4 7% 9% 45%	2459
	11th to 20th	Night	7% 6% 3 6% 5% 3 4 5% 7% 9% 45%	2404
	21st to end	Night	10% 6% 3 6% 5% 3 5% 6% 6% 8% 42%	2574
February	1st to 10th	Night	11% 6% 2 4 4 3 5% 4 6% 9% 45%	2178
	11th to 20th	Night	7% 4 3 4 4 3 4 5% 6% 7% 54%	2030
	21st to end	Night	8% 3 2 4 4 2 5% 5% 6% 8% 51%	1628
March	1st to 10th	Night	4 4 2 4 5% 3 4 5% 5% 8% 55%	1980
	11th to 20th	Night	5% 4 2 3 4 3 5% 5% 6% 9% 55%	1980
	21st to end	Night	6% 3 2 5% 5% 3 5% 5% 7% 9% 51%	2178
April	1st to 10th	Night	5% 2 1 3 4 3 5% 5% 5% 9% 58%	1980
	11th to 20th	Night	7% 3 2 5% 5% 3 6% 6% 8% 10% 45%	1847
	21st to end	Night	5% 4 2 5% 5% 3 5% 6% 7% 9% 49%	1800
May	1st to 10th	Night	5% 3 1 3 4 3 3 4 6% 10% 57%	1800
	11th to 20th	Night	9% 4 2 5% 6% 3 6% 6% 8% 10% 40%	1666
	21st to end	Night	5% 4 3 6% 7% 4 7% 7% 8% 11% 37%	1744
June	1st to 10th	Night	11% 8% 3 7% 7% 4 8% 7% 8% 13% 25%	1620
	11th to 20th	Night	6% 6% 3 6% 8% 4 8% 7% 10% 13% 29%	1620
	21st to end	Night	6% 5% 3 5% 6% 4 6% 7% 10% 12% 36%	1620
July	1st to 10th	Night	8% 6% 3 7% 8% 4 8% 7% 9% 10% 32%	1620
	11th to 20th	Night	6% 6% 3 6% 5% 4 6% 7% 10% 12% 36%	1620
	21st to end	Night	4 4 3 6% 5% 4 8% 8% 9% 14% 36%	1771
August	1st to 10th	Night	4 4 3 6% 6% 4 5% 6% 9% 16% 37%	1611
	11th to 20th	Night	4 4 2 5% 7% 4 6% 8% 9% 13% 37%	1744
	21st to end	Night	8% 6% 3 8% 7% 5% 7% 7% 9% 12% 29%	2085
September	1st to 10th	Night	5% 5% 3 7% 8% 6% 8% 8% 10% 13% 27%	1980
	11th to 20th	Night	7% 7% 4 8% 7% 4 7% 8% 8% 10% 29%	1980
	21st to end	Night	9% 8% 4 8% 8% 5% 6% 7% 7% 11% 26%	1980
October	1st to 10th	Night	10% 6% 3 7% 6% 4 6% 7% 9% 9% 33%	2072
	11th to 20th	Night	8% 6% 3 6% 7% 3 6% 7% 6% 9% 41%	2160
	21st to end	Night	9% 6% 2 5% 6% 3 6% 7% 6% 9% 41%	2376
November	1st to 10th	Night	9% 6% 3 6% 6% 3 7% 7% 7% 8% 38%	2221
	11th to 20th	Night	8% 6% 4 6% 7% 5% 5% 6% 6% 9% 39%	2280
	21st to end	Night	9% 7% 3 6% 6% 4 6% 7% 7% 9% 37%	2280
December	1st to 10th	Night	7% 5% 3 6% 7% 4 5% 5% 7% 9% 44%	2400
	11th to 20th	Night	13% 7% 3 6% 6% 3 5% 5% 5% 7% 39%	3042
	21st to end	Night	10% 8% 5% 9% 7% 4 6% 5% 6% 8% 32%	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	23% 39% 6% 13% 14% 4	1707
	11th to 20th	Day	25% 40% 5% 15% 11% 4	1662
	21st to end	Day	27% 37% 6% 15% 10% 5%	1782
February	1st to 10th	Day	26% 35% 5% 13% 15% 6%	1778
	11th to 20th	Day	22% 36% 8% 18% 11% 5%	1825
	21st to end	Day	20% 35% 7% 13% 20% 5%	1628
March	1st to 10th	Day	22% 35% 6% 18% 17% 3	1980
	11th to 20th	Day	21% 35% 8% 21% 11% 4	1980
	21st to end	Day	20% 35% 8% 20% 14% 4	2178
April	1st to 10th	Day	23% 35% 10% 18% 11% 2	1980
	11th to 20th	Day	26% 35% 10% 15% 12% 2	2061
	21st to end	Day	24% 36% 7% 14% 16% 3	2160
May	1st to 10th	Day	15% 36% 11% 22% 15% 1	2160
	11th to 20th	Day	28% 37% 12% 15% 8%	2243
	21st to end	Day	33% 37% 11% 12% 5%	2531
June	1st to 10th	Day	38% 37% 11% 10% 3	2340
	11th to 20th	Day	28% 38% 16% 15% 2	2340
	21st to end	Day	35% 38% 15% 9% 3	2340
July	1st to 10th	Day	36% 39% 18% 7% 1	2275
	11th to 20th	Day	33% 41% 17% 9% 1	2271
	21st to end	Day	30% 40% 16% 13%	2405
August	1st to 10th	Day	27% 39% 23% 10%	2314
	11th to 20th	Day	29% 39% 24% 7% 1	2135
	21st to end	Day	35% 40% 15% 8% 2	2265
September	1st to 10th	Day	32% 39% 17% 11% 2	1980
	11th to 20th	Day	33% 41% 16% 8% 2	1980
	21st to end	Day	36% 37% 11% 8% 6% 1	1980
October	1st to 10th	Day	30% 37% 9% 13% 8% 3	1886
	11th to 20th	Day	29% 36% 9% 14% 11% 1	1800
	21st to end	Day	28% 36% 5% 14% 15% 3	1980
November	1st to 10th	Day	25% 39% 2 13% 14% 7%	1857
	11th to 20th	Day	29% 39% 5% 14% 9% 4	1900
	21st to end	Day	25% 39% 9% 12% 13% 2	1900
December	1st to 10th	Day	24% 39% 9% 14% 11% 3	1776
	11th to 20th	Day	35% 31% 6% 10% 14% 5%	2150
	21st to end	Day	39% 23% 6% 14% 12% 5%	3124
January	1st to 10th	Night	20% 39% 9% 15% 13% 5%	2459
	11th to 20th	Night	25% 39% 5% 16% 10% 4	2404
	21st to end	Night	26% 37% 9% 15% 8% 6%	2574
February	1st to 10th	Night	25% 36% 6% 13% 14% 6%	2178
	11th to 20th	Night	22% 36% 8% 17% 13% 4	2031
	21st to end	Night	19% 35% 10% 14% 18% 4	1628
March	1st to 10th	Night	19% 35% 6% 18% 17% 5%	1980
	11th to 20th	Night	19% 35% 8% 24% 10% 4	1980
	21st to end	Night	18% 35% 8% 20% 13% 5%	2178
April	1st to 10th	Night	19% 35% 13% 19% 11% 4	1980
	11th to 20th	Night	21% 35% 12% 16% 14% 2	1847
	21st to end	Night	23% 35% 8% 15% 15% 3	1800
May	1st to 10th	Night	16% 35% 9% 24% 15% 2	1800
	11th to 20th	Night	25% 38% 14% 16% 7%	1667
	21st to end	Night	29% 37% 13% 15% 6%	1745
June	1st to 10th	Night	35% 38% 13% 11% 4	1620
	11th to 20th	Night	28% 38% 18% 13% 3	1620
	21st to end	Night	28% 42% 18% 11% 2	1620
July	1st to 10th	Night	34% 41% 16% 8% 1	1575
	11th to 20th	Night	31% 43% 17% 8% 1	1566
	21st to end	Night	25% 42% 22% 10% 1	1672
August	1st to 10th	Night	22% 40% 26% 11%	1600
	11th to 20th	Night	26% 40% 25% 8% 1	1744
	21st to end	Night	32% 41% 16% 9% 2	2085
September	1st to 10th	Night	31% 40% 17% 9% 2	1980
	11th to 20th	Night	34% 41% 14% 10% 2	1980
	21st to end	Night	36% 38% 11% 9% 5% 1	1980
October	1st to 10th	Night	28% 36% 11% 13% 10% 2	2072
	11th to 20th	Night	28% 37% 9% 14% 11% 2	2160
	21st to end	Night	26% 37% 6% 13% 15% 3	2376
November	1st to 10th	Night	26% 39% 3 12% 15% 6%	2221
	11th to 20th	Night	27% 39% 7% 16% 9% 3	2280
	21st to end	Night	26% 39% 7% 13% 13% 2	2280
December	1st to 10th	Night	23% 39% 7% 18% 8% 4	2400
	11th to 20th	Night	35% 32% 5% 12% 9% 6%	3044
	21st to end	Night	42% 23% 7% 11% 12% 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	9% 4 24% 38% 22% 1	270
	11th to 20th	Day	7% 3 25% 34% 25% 6%	254
	21st to end	Day	20% 8% 21% 39% 13%	264
February	1st to 10th	Day	11% 3 13% 40% 28% 5%	240
	11th to 20th	Day	8% 3 12% 37% 32% 7%	307
	21st to end	Day	8% 3 15% 35% 33% 7%	346
March	1st to 10th	Day	4 3 23% 39% 29% 2	420
	11th to 20th	Day	8% 2 17% 37% 31% 6%	420
	21st to end	Day	4 3 15% 40% 28% 10%	462
April	1st to 10th	Day	5% 1 16% 44% 27% 6%	420
	11th to 20th	Day	8% 3 15% 34% 36% 4	412
	21st to end	Day	7% 1 9% 35% 40% 9%	420
May	1st to 10th	Day	4 1 4 38% 42% 11%	423
	11th to 20th	Day	8% 1 5% 21% 46% 18%	447
	21st to end	Day	9% 3 2 13% 43% 30%	485
June	1st to 10th	Day	13% 2 2 16% 36% 30%	450
	11th to 20th	Day	6% 2 10% 37% 45%	450
	21st to end	Day	4 2 1 6% 28% 58%	450
July	1st to 10th	Day	5% 2 1 2 29% 62%	445
	11th to 20th	Day	5% 2 2 28% 62%	444
	21st to end	Day	7% 2 1 6% 28% 56%	488
August	1st to 10th	Day	3 2 2 4 28% 61%	446
	11th to 20th	Day	5% 1 2 29% 64%	439
	21st to end	Day	8% 1 2 7% 31% 50%	495
September	1st to 10th	Day	7% 1 2 6% 30% 54%	450
	11th to 20th	Day	10% 1 2 9% 35% 43%	450
	21st to end	Day	11% 1 3 12% 36% 38%	450
October	1st to 10th	Day	11% 2 6% 21% 44% 16%	450
	11th to 20th	Day	9% 2 7% 30% 38% 14%	450
	21st to end	Day	7% 3 9% 28% 42% 11%	495
November	1st to 10th	Day	12% 4 13% 28% 33% 10%	455
	11th to 20th	Day	15% 3 12% 34% 31% 5%	460
	21st to end	Day	7% 3 12% 39% 33% 6%	460
December	1st to 10th	Day	6% 3 13% 37% 33% 8%	336
	11th to 20th	Day	10% 3 15% 34% 30% 9%	270
	21st to end	Day	10% 2 13% 36% 32% 6%	297
January	1st to 10th	Night	12% 6% 22% 32% 26% 2	760
	11th to 20th	Night	10% 6% 21% 37% 23% 4	740
	21st to end	Night	10% 6% 23% 41% 18% 1	792
February	1st to 10th	Night	15% 4 16% 37% 24% 3	720
	11th to 20th	Night	8% 4 20% 39% 25% 3	703
	21st to end	Night	11% 2 16% 41% 29% 1	592
March	1st to 10th	Night	6% 4 23% 44% 20% 3	720
	11th to 20th	Night	6% 2 17% 38% 32% 5%	720
	21st to end	Night	6% 3 17% 41% 30% 3	792
April	1st to 10th	Night	6% 1 15% 43% 30% 4	720
	11th to 20th	Night	7% 4 13% 42% 31% 3	711
	21st to end	Night	7% 3 11% 40% 34% 5%	720
May	1st to 10th	Night	6% 2 9% 36% 44% 3	720
	11th to 20th	Night	10% 1 6% 31% 41% 10%	605
	21st to end	Night	7% 2 3 21% 47% 21%	584
June	1st to 10th	Night	13% 3 2 21% 42% 20%	540
	11th to 20th	Night	9% 3 1 10% 47% 30%	540
	21st to end	Night	7% 2 2 6% 39% 44%	540
July	1st to 10th	Night	9% 2 5% 36% 47%	525
	11th to 20th	Night	7% 2 4 34% 53%	522
	21st to end	Night	4 2 5% 37% 51%	591
August	1st to 10th	Night	5% 1 2 3 40% 48%	537
	11th to 20th	Night	5% 1 1 4 38% 52%	680
	21st to end	Night	9% 2 2 8% 38% 41%	792
September	1st to 10th	Night	8% 3 2 8% 36% 44%	720
	11th to 20th	Night	11% 3 2 10% 41% 34%	720
	21st to end	Night	13% 1 2 14% 42% 28%	720
October	1st to 10th	Night	14% 2 4 25% 43% 12%	720
	11th to 20th	Night	10% 3 8% 27% 40% 12%	720
	21st to end	Night	13% 2 11% 27% 37% 10%	792
November	1st to 10th	Night	10% 4 15% 30% 34% 8%	740
	11th to 20th	Night	12% 3 14% 37% 30% 5%	760
	21st to end	Night	13% 4 13% 38% 29% 3	760
December	1st to 10th	Night	9% 6% 15% 36% 30% 6%	760
	11th to 20th	Night	12% 4 16% 35% 27% 7%	760
	21st to end	Night	10% 4 18% 32% 33% 3	836

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