Palm Bay
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Palm Bay clear sky chart from 2005-11-06 to 2024-03-28.

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 6% 7% 8% 10% 38%	79173
	Night	8% 6% 3 6% 6% 4 6% 6% 7% 10% 39%	80826
Transparency	Day	27% 39% 11% 12% 9% 2	78896
	Night	27% 38% 11% 13% 9% 3	80622
Seeing	Day	8% 3 17% 27% 26% 19%	14906
	Night	9% 3 16% 30% 31% 11%	25091

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	10% 7% 3 7% 6% 4 5% 5% 5% 6% 41%	2836
	11th to 20th	Day	16% 9% 3 6% 6% 3 6% 4 6% 9% 32%	2840
	21st to end	Day	9% 7% 3 6% 6% 4 5% 6% 7% 7% 39%	3124
February	1st to 10th	Day	10% 6% 2 5% 4 3 5% 4 6% 9% 44%	1881
	11th to 20th	Day	7% 3 2 3 4 3 4 5% 6% 9% 53%	1890
	21st to end	Day	9% 4 2 4 5% 2 4 4 6% 7% 52%	1727
March	1st to 10th	Day	5% 4 2 5% 5% 4 5% 5% 6% 10% 50%	2090
	11th to 20th	Day	6% 2 2 5% 4 3 5% 5% 6% 10% 52%	2090
	21st to end	Day	6% 4 2 5% 4 3 5% 5% 6% 9% 51%	2255
April	1st to 10th	Day	5% 3 2 5% 4 3 6% 5% 7% 8% 52%	1980
	11th to 20th	Day	7% 4 2 5% 6% 4 6% 7% 9% 11% 39%	2052
	21st to end	Day	5% 4 2 5% 4 4 6% 6% 7% 9% 50%	2160
May	1st to 10th	Day	5% 2 1 3 4 3 4 5% 7% 10% 55%	2160
	11th to 20th	Day	8% 4 3 6% 5% 5% 7% 6% 7% 9% 39%	2286
	21st to end	Day	8% 5% 2 7% 6% 5% 6% 8% 8% 11% 34%	2531
June	1st to 10th	Day	11% 8% 3 7% 8% 4 8% 8% 8% 11% 24%	2340
	11th to 20th	Day	5% 4 2 6% 8% 5% 8% 9% 10% 13% 30%	2340
	21st to end	Day	7% 5% 3 7% 8% 4 7% 7% 9% 12% 31%	2340
July	1st to 10th	Day	7% 4 3 7% 7% 4 7% 8% 10% 13% 29%	2340
	11th to 20th	Day	7% 6% 3 7% 6% 4 7% 8% 10% 14% 28%	2340
	21st to end	Day	7% 4 3 6% 8% 4 8% 9% 9% 12% 29%	2547
August	1st to 10th	Day	5% 4 3 6% 6% 4 8% 9% 10% 15% 31%	2327
	11th to 20th	Day	6% 4 2 6% 6% 5% 8% 9% 10% 15% 30%	2163
	21st to end	Day	8% 6% 3 6% 9% 5% 7% 7% 9% 13% 27%	2250
September	1st to 10th	Day	6% 4 3 7% 7% 5% 7% 9% 12% 13% 27%	1980
	11th to 20th	Day	8% 5% 3 7% 7% 6% 7% 9% 9% 12% 27%	1980
	21st to end	Day	9% 7% 2 7% 7% 6% 8% 9% 9% 10% 26%	1980
October	1st to 10th	Day	11% 5% 3 7% 7% 4 7% 7% 9% 11% 31%	1896
	11th to 20th	Day	7% 5% 3 6% 6% 5% 7% 6% 7% 10% 40%	1800
	21st to end	Day	9% 4 2 6% 5% 3 4 6% 7% 10% 45%	1980
November	1st to 10th	Day	9% 4 2 5% 6% 4 6% 7% 8% 9% 41%	1857
	11th to 20th	Day	10% 7% 3 7% 6% 3 6% 5% 7% 10% 37%	1900
	21st to end	Day	8% 6% 3 5% 6% 3 6% 7% 8% 11% 38%	1900
December	1st to 10th	Day	8% 5% 3 5% 5% 3 5% 6% 7% 10% 43%	1734
	11th to 20th	Day	10% 6% 3 7% 6% 3 6% 5% 5% 9% 41%	2153
	21st to end	Day	10% 7% 3 7% 8% 4 8% 8% 6% 8% 32%	3124
January	1st to 10th	Night	9% 6% 4 6% 6% 4 5% 6% 7% 10% 38%	4109
	11th to 20th	Night	15% 12% 5% 8% 6% 3 5% 5% 5% 8% 30%	4120
	21st to end	Night	10% 5% 3 7% 6% 4 6% 5% 6% 8% 40%	4532
February	1st to 10th	Night	10% 6% 2 5% 5% 2 4 5% 5% 9% 45%	2295
	11th to 20th	Night	9% 4 2 4 4 2 3 5% 6% 7% 53%	2174
	21st to end	Night	7% 5% 2 4 3 2 5% 4 6% 9% 52%	1727
March	1st to 10th	Night	4 4 3 5% 5% 3 4 5% 5% 7% 54%	2090
	11th to 20th	Night	6% 3 2 4 4 3 4 5% 6% 10% 54%	2090
	21st to end	Night	5% 3 2 4 5% 3 6% 6% 8% 9% 49%	2256
April	1st to 10th	Night	5% 3 1 5% 4 2 5% 4 6% 9% 56%	1980
	11th to 20th	Night	5% 4 2 5% 6% 3 6% 6% 8% 10% 44%	1856
	21st to end	Night	6% 4 2 4 5% 4 5% 5% 6% 9% 49%	1800
May	1st to 10th	Night	5% 3 2 3 4 3 4 5% 6% 8% 58%	1800
	11th to 20th	Night	8% 5% 2 5% 5% 4 5% 6% 8% 11% 41%	1620
	21st to end	Night	6% 5% 2 6% 5% 4 7% 5% 8% 13% 37%	1744
June	1st to 10th	Night	11% 8% 3 6% 8% 4 8% 6% 8% 10% 28%	1620
	11th to 20th	Night	5% 5% 3 7% 7% 4 8% 7% 9% 14% 32%	1620
	21st to end	Night	7% 5% 2 5% 6% 4 7% 8% 8% 11% 35%	1620
July	1st to 10th	Night	9% 6% 3 7% 6% 4 6% 8% 8% 12% 30%	1620
	11th to 20th	Night	7% 5% 3 6% 6% 5% 8% 7% 10% 11% 34%	1620
	21st to end	Night	4 5% 2 5% 7% 4 6% 8% 9% 11% 37%	1771
August	1st to 10th	Night	5% 5% 2 5% 6% 4 6% 8% 9% 14% 36%	1611
	11th to 20th	Night	5% 4 2 6% 6% 5% 6% 8% 8% 13% 37%	1718
	21st to end	Night	9% 7% 3 7% 7% 6% 7% 8% 8% 11% 28%	2100
September	1st to 10th	Night	6% 6% 3 6% 9% 5% 8% 9% 10% 11% 27%	1980
	11th to 20th	Night	8% 6% 4 8% 7% 5% 6% 7% 9% 11% 28%	1980
	21st to end	Night	10% 7% 4 9% 7% 5% 6% 7% 8% 10% 27%	1980
October	1st to 10th	Night	11% 8% 3 6% 6% 4 5% 6% 8% 10% 32%	2061
	11th to 20th	Night	7% 6% 3 6% 6% 3 6% 6% 7% 9% 42%	2160
	21st to end	Night	9% 6% 2 5% 5% 3 5% 5% 7% 10% 43%	2376
November	1st to 10th	Night	7% 5% 3 7% 8% 5% 7% 5% 5% 8% 40%	2221
	11th to 20th	Night	9% 6% 3 6% 6% 3 5% 6% 6% 9% 40%	2280
	21st to end	Night	11% 6% 3 5% 6% 3 6% 6% 7% 11% 36%	2280
December	1st to 10th	Night	6% 4 3 5% 6% 4 6% 5% 6% 10% 45%	2441
	11th to 20th	Night	12% 8% 3 6% 6% 3 4 5% 6% 7% 39%	3042
	21st to end	Night	11% 7% 4 8% 7% 4 6% 6% 6% 9% 33%	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	32% 28% 5% 11% 20% 4	2837
	11th to 20th	Day	42% 28% 5% 14% 10% 2	2840
	21st to end	Day	32% 28% 8% 15% 14% 4	3124
February	1st to 10th	Day	25% 36% 7% 12% 16% 6%	1881
	11th to 20th	Day	21% 38% 11% 14% 10% 6%	1900
	21st to end	Day	18% 36% 8% 13% 19% 5%	1727
March	1st to 10th	Day	21% 37% 10% 15% 15% 3	2090
	11th to 20th	Day	19% 36% 11% 20% 10% 4	2090
	21st to end	Day	18% 38% 11% 17% 13% 4	2255
April	1st to 10th	Day	20% 39% 11% 16% 11% 3	1980
	11th to 20th	Day	24% 39% 10% 13% 11% 2	2052
	21st to end	Day	21% 38% 9% 14% 14% 4	2160
May	1st to 10th	Day	14% 39% 11% 18% 16% 1	2160
	11th to 20th	Day	26% 41% 11% 14% 8%	2290
	21st to end	Day	28% 43% 11% 12% 5%	2531
June	1st to 10th	Day	34% 42% 11% 9% 3	2340
	11th to 20th	Day	26% 44% 15% 14% 2	2340
	21st to end	Day	34% 42% 13% 8% 3	2340
July	1st to 10th	Day	32% 45% 15% 6% 1	2275
	11th to 20th	Day	32% 46% 14% 7%	2271
	21st to end	Day	28% 47% 13% 12% 1	2405
August	1st to 10th	Day	23% 47% 21% 9% 1	2314
	11th to 20th	Day	26% 48% 18% 7% 1	2163
	21st to end	Day	34% 45% 12% 6% 2	2250
September	1st to 10th	Day	27% 46% 16% 9% 2	1980
	11th to 20th	Day	30% 46% 14% 7% 3	1980
	21st to end	Day	34% 42% 9% 8% 6% 1	1980
October	1st to 10th	Day	27% 40% 10% 11% 8% 4	1896
	11th to 20th	Day	27% 39% 9% 13% 10% 2	1800
	21st to end	Day	24% 38% 9% 12% 14% 3	1980
November	1st to 10th	Day	23% 41% 6% 11% 14% 5%	1857
	11th to 20th	Day	26% 42% 7% 13% 10% 3	1900
	21st to end	Day	23% 43% 10% 11% 11% 2	1900
December	1st to 10th	Day	23% 41% 10% 12% 9% 3	1734
	11th to 20th	Day	32% 35% 7% 9% 13% 4	2150
	21st to end	Day	36% 29% 8% 10% 11% 5%	3124
January	1st to 10th	Night	30% 28% 8% 17% 14% 3	4109
	11th to 20th	Night	46% 26% 6% 13% 7% 2	4120
	21st to end	Night	33% 26% 9% 15% 11% 7%	4532
February	1st to 10th	Night	24% 36% 9% 11% 13% 7%	2295
	11th to 20th	Night	23% 36% 10% 15% 10% 5%	2175
	21st to end	Night	17% 36% 11% 15% 17% 4	1727
March	1st to 10th	Night	20% 35% 8% 18% 15% 5%	2090
	11th to 20th	Night	17% 36% 12% 21% 9% 4	2090
	21st to end	Night	17% 38% 10% 17% 12% 5%	2256
April	1st to 10th	Night	17% 39% 13% 16% 11% 4	1980
	11th to 20th	Night	21% 39% 10% 15% 14% 1	1856
	21st to end	Night	22% 38% 9% 13% 14% 4	1800
May	1st to 10th	Night	15% 39% 9% 21% 15% 2	1800
	11th to 20th	Night	21% 44% 13% 16% 6% 1	1621
	21st to end	Night	27% 41% 11% 13% 7%	1745
June	1st to 10th	Night	33% 41% 12% 11% 3	1620
	11th to 20th	Night	25% 43% 14% 15% 4	1620
	21st to end	Night	29% 44% 13% 11% 3	1620
July	1st to 10th	Night	33% 44% 15% 7% 1	1575
	11th to 20th	Night	31% 48% 12% 7% 1	1566
	21st to end	Night	23% 46% 21% 10% 1	1672
August	1st to 10th	Night	23% 45% 23% 10%	1600
	11th to 20th	Night	26% 44% 20% 8% 1	1718
	21st to end	Night	32% 44% 14% 8% 2	2100
September	1st to 10th	Night	30% 45% 14% 9% 2	1980
	11th to 20th	Night	33% 45% 12% 8% 1	1980
	21st to end	Night	34% 42% 10% 8% 6% 1	1980
October	1st to 10th	Night	27% 39% 10% 14% 8% 2	2061
	11th to 20th	Night	26% 39% 10% 14% 9% 3	2160
	21st to end	Night	23% 40% 9% 11% 14% 4	2376
November	1st to 10th	Night	23% 41% 6% 10% 14% 5%	2221
	11th to 20th	Night	24% 42% 8% 14% 8% 3	2280
	21st to end	Night	26% 42% 8% 11% 12% 2	2280
December	1st to 10th	Night	22% 41% 9% 16% 7% 4	2441
	11th to 20th	Night	33% 35% 8% 10% 9% 5%	3044
	21st to end	Night	36% 29% 8% 10% 11% 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	10% 9% 35% 32% 13% 2	270
	11th to 20th	Day	7% 8% 34% 30% 17% 3	270
	21st to end	Day	13% 12% 40% 27% 8%	297
February	1st to 10th	Day	11% 8% 29% 33% 17% 2	270
	11th to 20th	Day	9% 5% 29% 35% 16% 5%	312
	21st to end	Day	8% 4 28% 35% 22% 3	382
March	1st to 10th	Day	6% 7% 31% 39% 15% 2	460
	11th to 20th	Day	7% 5% 29% 35% 20% 4	460
	21st to end	Day	5% 6% 29% 33% 23% 5%	490
April	1st to 10th	Day	4 4 33% 33% 20% 5%	420
	11th to 20th	Day	9% 5% 24% 36% 20% 6%	412
	21st to end	Day	6% 3 17% 39% 25% 10%	420
May	1st to 10th	Day	3 2 20% 34% 29% 12%	423
	11th to 20th	Day	9% 2 12% 32% 29% 17%	447
	21st to end	Day	11% 2 8% 22% 33% 24%	485
June	1st to 10th	Day	12% 1 8% 22% 31% 24%	450
	11th to 20th	Day	6% 1 6% 20% 32% 36%	450
	21st to end	Day	6% 1 3 14% 32% 45%	450
July	1st to 10th	Day	6% 3 10% 31% 49%	445
	11th to 20th	Day	5% 1 9% 39% 46%	444
	21st to end	Day	8% 1 6% 14% 26% 45%	488
August	1st to 10th	Day	4 1 5% 10% 33% 45%	446
	11th to 20th	Day	4 3 9% 34% 49%	439
	21st to end	Day	8% 5% 17% 32% 37%	495
September	1st to 10th	Day	6% 2 5% 13% 32% 41%	450
	11th to 20th	Day	11% 1 8% 17% 31% 33%	450
	21st to end	Day	10% 1 6% 24% 32% 27%	450
October	1st to 10th	Day	14% 2 13% 30% 31% 10%	450
	11th to 20th	Day	6% 4 15% 33% 32% 10%	450
	21st to end	Day	8% 1 19% 34% 29% 8%	495
November	1st to 10th	Day	11% 4 19% 33% 24% 9%	455
	11th to 20th	Day	14% 4 23% 32% 23% 3	460
	21st to end	Day	8% 4 22% 41% 22% 4	460
December	1st to 10th	Day	7% 5% 23% 38% 20% 6%	294
	11th to 20th	Day	11% 5% 24% 36% 19% 4	270
	21st to end	Day	8% 7% 24% 39% 18% 4	297
January	1st to 10th	Night	14% 6% 24% 36% 18% 2	760
	11th to 20th	Night	10% 8% 25% 38% 18% 1	760
	21st to end	Night	11% 8% 29% 38% 14%	836
February	1st to 10th	Night	13% 6% 22% 38% 19% 1	760
	11th to 20th	Night	10% 5% 27% 39% 17% 2	743
	21st to end	Night	9% 3 25% 43% 20%	628
March	1st to 10th	Night	7% 5% 29% 44% 13% 1	760
	11th to 20th	Night	7% 4 25% 40% 21% 3	760
	21st to end	Night	7% 4 25% 41% 22% 1	821
April	1st to 10th	Night	5% 4 23% 44% 23% 2	720
	11th to 20th	Night	6% 3 23% 42% 23% 2	711
	21st to end	Night	7% 2 17% 46% 25% 3	720
May	1st to 10th	Night	7% 1 15% 46% 29% 2	720
	11th to 20th	Night	9% 2 10% 35% 35% 9%	559
	21st to end	Night	7% 2 7% 24% 48% 12%	584
June	1st to 10th	Night	12% 1 6% 24% 47% 11%	540
	11th to 20th	Night	7% 1 5% 14% 49% 23%	540
	21st to end	Night	7% 1 4 10% 48% 31%	540
July	1st to 10th	Night	10% 3 10% 44% 33%	525
	11th to 20th	Night	8% 3 6% 41% 41%	522
	21st to end	Night	5% 1 3 7% 47% 38%	591
August	1st to 10th	Night	5% 1 5% 6% 48% 35%	537
	11th to 20th	Night	6% 3 7% 45% 39%	654
	21st to end	Night	11% 1 5% 14% 41% 28%	792
September	1st to 10th	Night	9% 1 6% 10% 45% 28%	720
	11th to 20th	Night	11% 8% 13% 45% 23%	720
	21st to end	Night	13% 1 6% 17% 44% 18%	720
October	1st to 10th	Night	15% 2 10% 29% 36% 8%	720
	11th to 20th	Night	8% 2 11% 30% 41% 8%	720
	21st to end	Night	14% 2 14% 30% 34% 6%	792
November	1st to 10th	Night	10% 3 21% 32% 28% 6%	740
	11th to 20th	Night	10% 4 22% 35% 25% 4	760
	21st to end	Night	13% 3 20% 38% 23% 3	760
December	1st to 10th	Night	7% 4 20% 38% 28% 3	760
	11th to 20th	Night	10% 6% 22% 33% 25% 4	760
	21st to end	Night	9% 4 23% 37% 25% 2	836

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