Daytona Beach
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Daytona Beach 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	9% 6% 3 6% 6% 4 6% 6% 7% 10% 38%	79117
	Night	9% 6% 3 6% 6% 4 5% 6% 7% 9% 41%	80775
Transparency	Day	26% 39% 10% 12% 9% 3	78840
	Night	27% 37% 10% 13% 10% 4	80571
Seeing	Day	9% 3 10% 25% 32% 21%	14723
	Night	10% 3 14% 28% 32% 12%	24900

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	12% 7% 3 5% 6% 3 4 5% 5% 7% 43%	2836
	11th to 20th	Day	18% 9% 3 8% 5% 3 4 5% 5% 7% 33%	2840
	21st to end	Day	11% 7% 3 6% 5% 3 5% 5% 6% 7% 41%	3124
February	1st to 10th	Day	11% 7% 3 5% 5% 4 5% 5% 6% 8% 40%	1881
	11th to 20th	Day	8% 5% 2 5% 6% 3 4 4 4 7% 51%	1848
	21st to end	Day	9% 5% 3 5% 5% 3 4 6% 5% 9% 46%	1709
March	1st to 10th	Day	6% 4 2 4 5% 3 5% 4 7% 9% 51%	2090
	11th to 20th	Day	8% 4 3 4 5% 3 5% 4 6% 8% 51%	2090
	21st to end	Day	9% 4 3 5% 5% 3 5% 5% 5% 7% 51%	2200
April	1st to 10th	Day	7% 4 2 5% 5% 3 4 5% 6% 9% 50%	1980
	11th to 20th	Day	8% 5% 2 7% 6% 5% 5% 6% 7% 11% 38%	2041
	21st to end	Day	5% 4 2 4 5% 3 5% 4 7% 10% 52%	2160
May	1st to 10th	Day	6% 3 2 3 4 2 4 5% 5% 9% 57%	2254
	11th to 20th	Day	8% 4 2 5% 6% 4 6% 6% 8% 10% 41%	2301
	21st to end	Day	7% 5% 3 5% 6% 4 7% 7% 9% 11% 37%	2531
June	1st to 10th	Day	9% 6% 3 7% 7% 4 7% 8% 9% 12% 27%	2340
	11th to 20th	Day	5% 4 3 6% 7% 4 8% 9% 10% 11% 33%	2340
	21st to end	Day	8% 5% 3 6% 8% 4 9% 8% 8% 12% 30%	2340
July	1st to 10th	Day	8% 6% 3 7% 7% 4 9% 8% 8% 12% 28%	2340
	11th to 20th	Day	7% 6% 3 8% 7% 5% 8% 8% 9% 11% 27%	2340
	21st to end	Day	5% 5% 3 7% 8% 5% 9% 7% 9% 12% 29%	2547
August	1st to 10th	Day	5% 5% 2 6% 7% 5% 8% 8% 10% 13% 29%	2327
	11th to 20th	Day	5% 4 2 6% 7% 4 9% 10% 10% 14% 29%	2226
	21st to end	Day	9% 6% 3 7% 7% 5% 8% 7% 8% 12% 28%	2232
September	1st to 10th	Day	7% 6% 3 8% 7% 6% 10% 10% 9% 11% 25%	1980
	11th to 20th	Day	9% 5% 4 6% 6% 5% 8% 8% 10% 13% 25%	1980
	21st to end	Day	11% 6% 3 7% 8% 4 6% 7% 9% 10% 29%	1980
October	1st to 10th	Day	11% 7% 3 7% 7% 4 6% 7% 6% 10% 34%	1915
	11th to 20th	Day	7% 5% 2 6% 6% 4 5% 6% 8% 8% 44%	1800
	21st to end	Day	9% 5% 2 5% 5% 3 5% 5% 7% 10% 45%	1980
November	1st to 10th	Day	8% 5% 2 6% 7% 4 5% 6% 6% 8% 42%	1857
	11th to 20th	Day	10% 6% 3 7% 6% 4 6% 5% 6% 9% 37%	1900
	21st to end	Day	11% 6% 3 7% 6% 3 5% 5% 7% 8% 40%	1821
December	1st to 10th	Day	7% 4 3 5% 5% 3 6% 5% 7% 9% 46%	1710
	11th to 20th	Day	10% 7% 3 6% 7% 4 6% 6% 6% 8% 37%	2153
	21st to end	Day	12% 8% 3 7% 6% 4 5% 5% 6% 7% 37%	3124
January	1st to 10th	Night	12% 8% 3 6% 5% 4 5% 5% 6% 7% 40%	4109
	11th to 20th	Night	16% 10% 4 6% 5% 3 4 5% 6% 8% 34%	4120
	21st to end	Night	11% 6% 3 7% 6% 4 5% 5% 6% 7% 40%	4532
February	1st to 10th	Night	12% 6% 2 5% 5% 3 5% 4 5% 7% 44%	2297
	11th to 20th	Night	10% 5% 2 5% 5% 3 5% 4 5% 7% 49%	2218
	21st to end	Night	8% 5% 2 5% 4 3 4 5% 5% 9% 50%	1742
March	1st to 10th	Night	7% 5% 2 4 4 3 3 4 5% 8% 56%	2090
	11th to 20th	Night	8% 4 2 4 4 3 4 5% 5% 10% 51%	2090
	21st to end	Night	7% 5% 2 6% 5% 3 5% 4 5% 7% 53%	2201
April	1st to 10th	Night	7% 5% 2 4 5% 4 4 4 5% 9% 52%	1980
	11th to 20th	Night	7% 5% 3 6% 6% 3 5% 5% 6% 7% 47%	1865
	21st to end	Night	6% 4 2 4 5% 3 5% 4 6% 9% 53%	1800
May	1st to 10th	Night	5% 2 1 3 3 3 3 6% 6% 8% 59%	1719
	11th to 20th	Night	6% 4 2 4 6% 4 5% 6% 6% 9% 47%	1592
	21st to end	Night	7% 5% 3 5% 6% 3 5% 7% 8% 11% 40%	1744
June	1st to 10th	Night	10% 5% 2 6% 6% 3 7% 6% 8% 13% 33%	1620
	11th to 20th	Night	4 4 4 6% 6% 4 7% 7% 9% 13% 36%	1620
	21st to end	Night	6% 6% 3 7% 6% 4 6% 8% 9% 11% 35%	1620
July	1st to 10th	Night	8% 5% 3 5% 7% 4 6% 6% 8% 13% 33%	1620
	11th to 20th	Night	4 4 3 7% 7% 5% 8% 7% 9% 12% 33%	1620
	21st to end	Night	4 4 3 7% 7% 5% 7% 7% 8% 13% 36%	1771
August	1st to 10th	Night	4 5% 3 7% 7% 4 6% 7% 8% 13% 35%	1611
	11th to 20th	Night	4 4 3 5% 7% 4 6% 7% 9% 13% 37%	1656
	21st to end	Night	9% 6% 3 8% 8% 5% 6% 7% 8% 11% 29%	2119
September	1st to 10th	Night	8% 6% 3 8% 7% 5% 8% 8% 9% 11% 28%	1980
	11th to 20th	Night	11% 7% 4 8% 7% 5% 7% 7% 8% 10% 27%	1980
	21st to end	Night	11% 7% 3 6% 7% 4 5% 7% 7% 11% 32%	1980
October	1st to 10th	Night	9% 7% 3 8% 7% 4 5% 7% 7% 8% 35%	2042
	11th to 20th	Night	6% 5% 2 5% 5% 3 5% 5% 7% 9% 49%	2160
	21st to end	Night	9% 5% 2 4 5% 3 6% 4 6% 8% 47%	2376
November	1st to 10th	Night	9% 6% 2 6% 6% 4 5% 6% 6% 8% 42%	2221
	11th to 20th	Night	9% 5% 3 6% 6% 4 5% 6% 7% 8% 41%	2280
	21st to end	Night	9% 5% 3 5% 6% 4 6% 6% 6% 9% 38%	2356
December	1st to 10th	Night	8% 4 2 6% 5% 3 5% 5% 7% 9% 46%	2470
	11th to 20th	Night	14% 7% 2 6% 5% 3 4 4 5% 7% 43%	3042
	21st to end	Night	14% 9% 3 7% 6% 3 5% 5% 5% 7% 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	29% 27% 6% 12% 18% 7%	2837
	11th to 20th	Day	43% 26% 4 10% 12% 5%	2840
	21st to end	Day	30% 28% 8% 12% 13% 9%	3124
February	1st to 10th	Day	27% 37% 6% 10% 14% 5%	1881
	11th to 20th	Day	25% 36% 7% 12% 11% 8%	1858
	21st to end	Day	20% 36% 9% 12% 17% 5%	1709
March	1st to 10th	Day	19% 37% 9% 16% 15% 5%	2090
	11th to 20th	Day	21% 36% 11% 18% 9% 4	2090
	21st to end	Day	20% 38% 11% 15% 13% 3	2200
April	1st to 10th	Day	20% 38% 11% 15% 12% 5%	1980
	11th to 20th	Day	25% 39% 8% 14% 11% 3	2041
	21st to end	Day	17% 39% 12% 15% 14% 4	2160
May	1st to 10th	Day	16% 38% 9% 19% 15% 2	2254
	11th to 20th	Day	21% 42% 13% 14% 9% 1	2305
	21st to end	Day	25% 42% 12% 14% 7%	2531
June	1st to 10th	Day	30% 42% 12% 12% 4	2340
	11th to 20th	Day	25% 43% 16% 14% 2	2340
	21st to end	Day	32% 42% 13% 10% 3	2340
July	1st to 10th	Day	32% 46% 12% 9% 1	2275
	11th to 20th	Day	31% 47% 13% 8% 1	2271
	21st to end	Day	25% 47% 16% 11% 2	2405
August	1st to 10th	Day	24% 46% 19% 10% 1	2314
	11th to 20th	Day	25% 46% 17% 10% 1	2226
	21st to end	Day	34% 45% 12% 7% 2	2232
September	1st to 10th	Day	29% 45% 15% 9% 2	1980
	11th to 20th	Day	29% 47% 15% 7% 2	1980
	21st to end	Day	33% 41% 9% 8% 7% 2	1980
October	1st to 10th	Day	27% 39% 8% 10% 11% 6%	1915
	11th to 20th	Day	24% 38% 7% 14% 13% 4	1800
	21st to end	Day	23% 39% 6% 12% 16% 4	1980
November	1st to 10th	Day	22% 42% 7% 11% 13% 5%	1857
	11th to 20th	Day	25% 41% 8% 10% 13% 3	1900
	21st to end	Day	26% 42% 7% 10% 12% 2	1821
December	1st to 10th	Day	21% 42% 11% 13% 9% 3	1710
	11th to 20th	Day	31% 37% 7% 9% 13% 4	2150
	21st to end	Day	33% 29% 7% 11% 14% 7%	3124
January	1st to 10th	Night	31% 27% 6% 12% 16% 7%	4109
	11th to 20th	Night	41% 26% 5% 14% 11% 3	4120
	21st to end	Night	32% 27% 8% 12% 11% 8%	4532
February	1st to 10th	Night	26% 36% 7% 9% 12% 9%	2297
	11th to 20th	Night	24% 39% 9% 11% 9% 8%	2219
	21st to end	Night	20% 35% 9% 13% 16% 6%	1742
March	1st to 10th	Night	18% 36% 9% 16% 15% 6%	2090
	11th to 20th	Night	19% 36% 12% 18% 10% 5%	2090
	21st to end	Night	19% 39% 8% 17% 12% 5%	2201
April	1st to 10th	Night	19% 38% 12% 13% 10% 7%	1980
	11th to 20th	Night	23% 38% 8% 15% 13% 3	1865
	21st to end	Night	18% 38% 10% 16% 13% 4	1800
May	1st to 10th	Night	13% 39% 11% 19% 15% 2	1719
	11th to 20th	Night	20% 42% 14% 17% 6% 1	1593
	21st to end	Night	23% 42% 13% 12% 10%	1745
June	1st to 10th	Night	26% 39% 14% 16% 4	1620
	11th to 20th	Night	23% 43% 15% 17% 3	1620
	21st to end	Night	26% 43% 15% 11% 4 1	1620
July	1st to 10th	Night	30% 44% 14% 10% 2	1575
	11th to 20th	Night	31% 45% 14% 9% 2	1566
	21st to end	Night	23% 44% 16% 15% 1	1672
August	1st to 10th	Night	24% 46% 20% 9% 1	1600
	11th to 20th	Night	25% 42% 21% 10% 2	1656
	21st to end	Night	34% 43% 11% 10% 2	2119
September	1st to 10th	Night	29% 44% 14% 10% 2	1980
	11th to 20th	Night	35% 43% 12% 7% 2	1980
	21st to end	Night	31% 41% 10% 9% 7% 1	1980
October	1st to 10th	Night	27% 40% 8% 10% 10% 5%	2042
	11th to 20th	Night	22% 39% 8% 16% 13% 4	2160
	21st to end	Night	23% 39% 8% 11% 14% 6%	2376
November	1st to 10th	Night	22% 42% 7% 11% 13% 6%	2221
	11th to 20th	Night	24% 41% 7% 12% 10% 4	2280
	21st to end	Night	25% 42% 9% 10% 11% 2	2356
December	1st to 10th	Night	22% 41% 10% 15% 7% 4	2470
	11th to 20th	Night	30% 34% 9% 9% 14% 3	3044
	21st to end	Night	35% 29% 8% 11% 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	14% 2 23% 45% 15% 1	270
	11th to 20th	Day	9% 4 25% 35% 21% 6%	270
	21st to end	Day	14% 6% 25% 46% 8%	297
February	1st to 10th	Day	15% 6% 19% 34% 24% 2	270
	11th to 20th	Day	11% 5% 19% 39% 21% 4	270
	21st to end	Day	9% 2 20% 38% 26% 5%	364
March	1st to 10th	Day	7% 4 23% 43% 22% 2	460
	11th to 20th	Day	11% 3 21% 34% 26% 5%	460
	21st to end	Day	10% 3 15% 37% 28% 6%	470
April	1st to 10th	Day	10% 4 19% 37% 26% 5%	420
	11th to 20th	Day	9% 3 17% 33% 29% 9%	412
	21st to end	Day	6% 2 10% 36% 34% 12%	420
May	1st to 10th	Day	5% 2 11% 35% 37% 10%	423
	11th to 20th	Day	8% 2 6% 20% 42% 21%	447
	21st to end	Day	8% 1 3 14% 44% 30%	485
June	1st to 10th	Day	12% 2 3 18% 40% 24%	450
	11th to 20th	Day	8% 1 3 12% 37% 38%	450
	21st to end	Day	5% 2 3 10% 34% 46%	450
July	1st to 10th	Day	6% 3 6% 31% 54%	445
	11th to 20th	Day	5% 2 3 32% 57%	444
	21st to end	Day	7% 2 8% 39% 44%	488
August	1st to 10th	Day	6% 1 2 9% 36% 46%	446
	11th to 20th	Day	4 1 1 6% 28% 60%	439
	21st to end	Day	10% 1 2 7% 34% 46%	495
September	1st to 10th	Day	9% 1 4 8% 38% 41%	450
	11th to 20th	Day	10% 2 2 13% 43% 30%	450
	21st to end	Day	10% 3 4 13% 39% 31%	450
October	1st to 10th	Day	15% 3 7% 32% 33% 10%	450
	11th to 20th	Day	6% 3 10% 26% 44% 11%	450
	21st to end	Day	10% 2 9% 30% 41% 8%	495
November	1st to 10th	Day	10% 6% 14% 28% 33% 9%	455
	11th to 20th	Day	17% 3 15% 35% 27% 4	460
	21st to end	Day	13% 3 18% 37% 25% 5%	381
December	1st to 10th	Day	8% 2 17% 38% 30% 6%	270
	11th to 20th	Day	11% 4 22% 35% 25% 3	270
	21st to end	Day	11% 3 15% 32% 33% 6%	297
January	1st to 10th	Night	14% 6% 25% 36% 16% 2	760
	11th to 20th	Night	12% 4 25% 36% 20% 3	760
	21st to end	Night	14% 7% 30% 36% 13%	836
February	1st to 10th	Night	16% 6% 20% 37% 19% 2	760
	11th to 20th	Night	12% 5% 25% 39% 17% 2	743
	21st to end	Night	11% 3 20% 45% 18% 3	628
March	1st to 10th	Night	6% 5% 24% 43% 20% 2	760
	11th to 20th	Night	9% 4 19% 41% 22% 5%	760
	21st to end	Night	9% 3 20% 38% 28% 3	801
April	1st to 10th	Night	8% 3 20% 39% 26% 4	720
	11th to 20th	Night	8% 4 16% 40% 30% 3	711
	21st to end	Night	7% 2 15% 38% 32% 5%	720
May	1st to 10th	Night	6% 1 13% 36% 39% 4	639
	11th to 20th	Night	8% 2 8% 30% 42% 11%	531
	21st to end	Night	8% 1 5% 20% 47% 18%	584
June	1st to 10th	Night	10% 2 5% 22% 49% 12%	540
	11th to 20th	Night	8% 1 4 15% 42% 30%	540
	21st to end	Night	7% 1 2 13% 47% 29%	540
July	1st to 10th	Night	8% 3 1 10% 41% 38%	525
	11th to 20th	Night	6% 1 2 7% 44% 41%	522
	21st to end	Night	5% 1 3 10% 51% 31%	591
August	1st to 10th	Night	8% 1 2 9% 47% 33%	537
	11th to 20th	Night	5% 1 2 7% 47% 38%	592
	21st to end	Night	11% 2 4 11% 41% 31%	792
September	1st to 10th	Night	11% 2 4 8% 46% 29%	720
	11th to 20th	Night	12% 2 5% 17% 44% 20%	720
	21st to end	Night	14% 3 4 15% 43% 21%	720
October	1st to 10th	Night	14% 2 9% 28% 38% 10%	720
	11th to 20th	Night	8% 2 10% 28% 43% 9%	720
	21st to end	Night	12% 3 11% 30% 39% 6%	792
November	1st to 10th	Night	12% 3 15% 32% 31% 6%	740
	11th to 20th	Night	13% 4 16% 37% 25% 4	760
	21st to end	Night	12% 4 21% 38% 22% 4	760
December	1st to 10th	Night	10% 4 18% 33% 29% 6%	760
	11th to 20th	Night	15% 6% 20% 29% 25% 6%	760
	21st to end	Night	13% 4 20% 32% 27% 3	836

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