Fort Walton Beach
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Fort Walton Beach 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	10% 5% 2 5% 5% 3 5% 6% 7% 9% 43%	79337
	Night	10% 5% 2 5% 5% 3 4 5% 6% 8% 46%	80662
Transparency	Day	24% 37% 9% 13% 12% 5%	79072
	Night	24% 36% 8% 12% 14% 6%	80446
Seeing	Day	11% 3 13% 25% 31% 17%	13780
	Night	11% 5% 17% 26% 29% 12%	23853

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% 5% 1 4 5% 3 5% 5% 5% 7% 46%	2872
	11th to 20th	Day	11% 4 2 4 3 2 4 5% 6% 8% 52%	3160
	21st to end	Day	23% 6% 3 5% 4 3 3 4 5% 7% 37%	3476
February	1st to 10th	Day	16% 7% 2 5% 5% 3 3 4 4 7% 43%	1900
	11th to 20th	Day	15% 7% 3 4 4 3 3 3 5% 7% 47%	1848
	21st to end	Day	14% 7% 2 5% 4 4 5% 5% 6% 8% 39%	1570
March	1st to 10th	Day	10% 5% 2 4 5% 3 4 4 6% 7% 49%	1900
	11th to 20th	Day	11% 4 2 5% 5% 3 5% 6% 6% 7% 45%	2022
	21st to end	Day	11% 6% 2 4 4 3 4 4 5% 8% 47%	2318
April	1st to 10th	Day	11% 6% 2 4 4 3 5% 4 5% 8% 48%	2160
	11th to 20th	Day	10% 6% 3 5% 4 3 4 5% 5% 6% 48%	2134
	21st to end	Day	6% 3 2 4 4 3 4 4 5% 8% 57%	2160
May	1st to 10th	Day	7% 4 2 3 3 2 5% 4 6% 7% 57%	2209
	11th to 20th	Day	6% 4 2 6% 6% 3 5% 6% 8% 10% 46%	2301
	21st to end	Day	5% 4 2 4 5% 4 6% 5% 8% 12% 45%	2531
June	1st to 10th	Day	7% 5% 3 6% 6% 4 7% 7% 8% 12% 33%	2340
	11th to 20th	Day	5% 3 2 4 5% 4 7% 8% 10% 15% 37%	2340
	21st to end	Day	6% 5% 2 6% 6% 4 7% 8% 9% 14% 32%	2340
July	1st to 10th	Day	8% 5% 2 6% 6% 5% 8% 9% 10% 12% 28%	2340
	11th to 20th	Day	7% 5% 2 7% 8% 5% 8% 9% 10% 13% 26%	2318
	21st to end	Day	5% 4 3 6% 7% 5% 8% 10% 11% 12% 31%	2350
August	1st to 10th	Day	6% 4 2 5% 7% 4 7% 8% 11% 14% 30%	2148
	11th to 20th	Day	8% 6% 3 7% 7% 5% 6% 8% 10% 13% 28%	2125
	21st to end	Day	11% 6% 2 6% 6% 5% 7% 6% 8% 10% 34%	2376
September	1st to 10th	Day	8% 5% 2 6% 6% 4 6% 8% 8% 11% 36%	2082
	11th to 20th	Day	11% 5% 3 5% 6% 4 5% 7% 8% 9% 37%	1980
	21st to end	Day	7% 4 1 5% 5% 4 5% 6% 6% 8% 49%	1980
October	1st to 10th	Day	7% 4 2 4 5% 3 4 4 5% 8% 53%	1980
	11th to 20th	Day	8% 3 2 4 4 2 3 4 4 6% 61%	1980
	21st to end	Day	9% 4 2 5% 4 2 4 3 5% 5% 57%	2018
November	1st to 10th	Day	8% 4 1 4 4 2 4 3 5% 6% 59%	1672
	11th to 20th	Day	9% 4 2 5% 3 2 4 3 4 8% 55%	1710
	21st to end	Day	12% 4 2 5% 5% 3 3 4 5% 8% 49%	1710
December	1st to 10th	Day	12% 5% 2 5% 5% 2 4 4 5% 8% 48%	1710
	11th to 20th	Day	14% 7% 3 5% 5% 2 4 4 4 7% 43%	2153
	21st to end	Day	16% 9% 4 7% 5% 2 3 3 3 5% 43%	3124
January	1st to 10th	Night	15% 5% 2 5% 5% 3 4 4 5% 6% 45%	4069
	11th to 20th	Night	11% 5% 2 5% 5% 3 3 4 6% 7% 48%	3800
	21st to end	Night	21% 8% 3 4 4 3 4 4 4 6% 39%	4180
February	1st to 10th	Night	15% 7% 3 5% 4 3 4 3 4 5% 46%	2280
	11th to 20th	Night	17% 7% 2 5% 4 2 4 4 4 6% 47%	2218
	21st to end	Night	14% 8% 2 6% 4 3 5% 4 6% 5% 43%	1884
March	1st to 10th	Night	12% 6% 2 5% 4 3 4 5% 5% 8% 48%	2280
	11th to 20th	Night	9% 6% 2 5% 5% 3 4 5% 5% 9% 46%	2157
	21st to end	Night	10% 5% 2 4 4 3 4 4 6% 8% 49%	2204
April	1st to 10th	Night	10% 6% 3 6% 4 3 5% 6% 5% 7% 46%	1800
	11th to 20th	Night	11% 5% 2 5% 4 3 4 5% 5% 8% 47%	1775
	21st to end	Night	6% 3 2 3 3 3 4 4 5% 8% 60%	1800
May	1st to 10th	Night	7% 3 2 4 3 2 4 4 5% 9% 56%	1749
	11th to 20th	Night	5% 4 2 5% 6% 3 5% 5% 6% 9% 50%	1592
	21st to end	Night	6% 4 2 3 5% 2 4 5% 7% 11% 50%	1744
June	1st to 10th	Night	7% 6% 2 5% 6% 3 6% 6% 8% 12% 39%	1620
	11th to 20th	Night	4 3 2 3 5% 3 6% 6% 9% 14% 46%	1620
	21st to end	Night	5% 4 3 5% 5% 3 5% 8% 9% 12% 42%	1620
July	1st to 10th	Night	7% 3 2 6% 5% 4 7% 6% 8% 14% 38%	1620
	11th to 20th	Night	4 2 2 4 6% 4 6% 9% 10% 15% 39%	1637
	21st to end	Night	3 3 2 5% 5% 4 6% 7% 8% 14% 43%	1968
August	1st to 10th	Night	4 3 1 4 5% 4 6% 6% 9% 15% 43%	1790
	11th to 20th	Night	6% 5% 2 6% 5% 3 6% 7% 10% 14% 35%	1776
	21st to end	Night	7% 4 2 7% 7% 5% 6% 6% 7% 11% 37%	1980
September	1st to 10th	Night	7% 4 2 5% 7% 4 7% 7% 8% 12% 37%	1858
	11th to 20th	Night	8% 5% 2 6% 6% 4 6% 5% 6% 9% 43%	1980
	21st to end	Night	8% 5% 2 5% 4 3 5% 4 5% 9% 50%	1980
October	1st to 10th	Night	6% 5% 3 5% 5% 2 4 4 7% 8% 52%	1980
	11th to 20th	Night	7% 4 2 3 4 2 3 3 4 6% 63%	1980
	21st to end	Night	9% 4 2 5% 4 3 5% 4 4 6% 55%	2331
November	1st to 10th	Night	8% 4 2 4 4 2 3 4 5% 7% 59%	2406
	11th to 20th	Night	9% 5% 2 4 4 2 3 4 4 7% 55%	2470
	21st to end	Night	11% 5% 2 5% 4 3 4 4 5% 7% 49%	2470
December	1st to 10th	Night	13% 5% 2 5% 5% 3 4 4 5% 7% 46%	2470
	11th to 20th	Night	15% 6% 2 5% 4 3 4 5% 5% 7% 45%	3042
	21st to end	Night	16% 8% 3 6% 5% 3 4 4 4 5% 41%	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	26% 27% 4 15% 20% 8%	2873
	11th to 20th	Day	22% 26% 6% 14% 19% 12%	3160
	21st to end	Day	39% 23% 4 12% 14% 8%	3476
February	1st to 10th	Day	28% 35% 5% 12% 13% 7%	1900
	11th to 20th	Day	28% 36% 4 10% 13% 9%	1858
	21st to end	Day	28% 36% 5% 12% 13% 5%	1570
March	1st to 10th	Day	25% 34% 5% 16% 14% 7%	1900
	11th to 20th	Day	22% 37% 11% 12% 12% 6%	2022
	21st to end	Day	24% 37% 9% 15% 11% 4	2318
April	1st to 10th	Day	23% 38% 7% 12% 13% 6%	2160
	11th to 20th	Day	22% 36% 6% 14% 15% 7%	2134
	21st to end	Day	15% 38% 8% 18% 17% 5%	2160
May	1st to 10th	Day	17% 38% 11% 19% 13% 3	2209
	11th to 20th	Day	18% 42% 13% 14% 11% 2	2305
	21st to end	Day	17% 39% 10% 18% 15% 1	2531
June	1st to 10th	Day	22% 41% 13% 17% 6% 1	2340
	11th to 20th	Day	16% 41% 16% 20% 6% 1	2340
	21st to end	Day	24% 40% 13% 15% 7% 1	2340
July	1st to 10th	Day	30% 44% 15% 9% 2	2275
	11th to 20th	Day	27% 45% 16% 9% 3 1	2249
	21st to end	Day	23% 46% 19% 11% 2	2219
August	1st to 10th	Day	22% 43% 16% 15% 4	2136
	11th to 20th	Day	27% 41% 17% 11% 4	2125
	21st to end	Day	30% 40% 12% 12% 5% 2	2376
September	1st to 10th	Day	24% 41% 13% 13% 7% 2	2082
	11th to 20th	Day	28% 40% 10% 9% 8% 4	1980
	21st to end	Day	19% 38% 8% 12% 16% 6%	1980
October	1st to 10th	Day	19% 39% 5% 12% 14% 11%	1980
	11th to 20th	Day	18% 36% 5% 14% 18% 10%	1980
	21st to end	Day	18% 37% 4 9% 21% 10%	2018
November	1st to 10th	Day	12% 40% 4 14% 19% 12%	1672
	11th to 20th	Day	17% 40% 5% 12% 17% 9%	1710
	21st to end	Day	22% 41% 4 12% 14% 6%	1710
December	1st to 10th	Day	22% 40% 7% 13% 13% 5%	1710
	11th to 20th	Day	31% 33% 4 10% 16% 5%	2150
	21st to end	Day	32% 25% 4 15% 20% 3	3124
January	1st to 10th	Night	31% 27% 4 8% 19% 12%	4069
	11th to 20th	Night	27% 26% 5% 12% 25% 6%	3800
	21st to end	Night	38% 24% 5% 12% 15% 6%	4180
February	1st to 10th	Night	29% 34% 4 12% 14% 8%	2280
	11th to 20th	Night	30% 35% 3 8% 12% 11%	2219
	21st to end	Night	28% 35% 4 12% 13% 8%	1884
March	1st to 10th	Night	23% 36% 5% 14% 16% 7%	2280
	11th to 20th	Night	19% 36% 9% 16% 13% 7%	2157
	21st to end	Night	22% 36% 8% 13% 14% 6%	2204
April	1st to 10th	Night	24% 38% 7% 11% 13% 7%	1800
	11th to 20th	Night	23% 36% 6% 14% 15% 6%	1775
	21st to end	Night	15% 37% 6% 18% 19% 5%	1800
May	1st to 10th	Night	17% 37% 11% 16% 15% 3	1749
	11th to 20th	Night	20% 40% 12% 14% 13% 2	1593
	21st to end	Night	17% 39% 11% 18% 12% 3	1745
June	1st to 10th	Night	22% 40% 13% 17% 8% 1	1620
	11th to 20th	Night	16% 42% 16% 19% 6% 1	1620
	21st to end	Night	20% 42% 16% 14% 7% 1	1620
July	1st to 10th	Night	27% 45% 14% 10% 4	1575
	11th to 20th	Night	19% 47% 21% 10% 3	1583
	21st to end	Night	22% 43% 24% 10% 1	1858
August	1st to 10th	Night	17% 42% 20% 17% 3	1778
	11th to 20th	Night	24% 41% 20% 12% 3	1776
	21st to end	Night	31% 42% 10% 11% 5% 1	1980
September	1st to 10th	Night	26% 40% 14% 11% 8% 1	1858
	11th to 20th	Night	27% 40% 8% 11% 10% 3	1980
	21st to end	Night	22% 39% 7% 11% 15% 6%	1980
October	1st to 10th	Night	20% 38% 4 11% 15% 11%	1980
	11th to 20th	Night	18% 36% 5% 11% 21% 9%	1980
	21st to end	Night	20% 37% 3 9% 19% 12%	2331
November	1st to 10th	Night	11% 40% 3 13% 17% 15%	2406
	11th to 20th	Night	19% 40% 3 11% 17% 9%	2470
	21st to end	Night	23% 40% 5% 11% 14% 7%	2470
December	1st to 10th	Night	23% 41% 5% 12% 15% 5%	2470
	11th to 20th	Night	28% 33% 5% 10% 17% 7%	3044
	21st to end	Night	33% 26% 3 15% 20% 3	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	16% 10% 28% 33% 12% 1	270
	11th to 20th	Day	9% 8% 29% 34% 18% 2	270
	21st to end	Day	21% 10% 31% 31% 7%	297
February	1st to 10th	Day	18% 8% 27% 30% 16% 1	270
	11th to 20th	Day	19% 4 25% 40% 12%	270
	21st to end	Day	9% 8% 29% 43% 11%	225
March	1st to 10th	Day	14% 4 33% 31% 17% 1	270
	11th to 20th	Day	10% 7% 28% 37% 17% 1	392
	21st to end	Day	11% 6% 27% 37% 17% 2	490
April	1st to 10th	Day	14% 6% 21% 35% 22% 3	420
	11th to 20th	Day	15% 6% 21% 31% 24% 4	412
	21st to end	Day	7% 3 18% 36% 30% 6%	420
May	1st to 10th	Day	8% 2 16% 36% 30% 8%	423
	11th to 20th	Day	7% 2 8% 34% 35% 14%	447
	21st to end	Day	8% 2 4 21% 43% 22%	485
June	1st to 10th	Day	12% 1 6% 20% 44% 17%	450
	11th to 20th	Day	7% 2 5% 18% 43% 26%	450
	21st to end	Day	9% 1 5% 19% 35% 31%	450
July	1st to 10th	Day	8% 1 2 10% 41% 38%	445
	11th to 20th	Day	6% 1 3 9% 36% 45%	444
	21st to end	Day	4 1 3 12% 42% 38%	488
August	1st to 10th	Day	8% 1 2 9% 36% 44%	446
	11th to 20th	Day	10% 2 5% 40% 42%	439
	21st to end	Day	10% 1 5% 14% 39% 31%	495
September	1st to 10th	Day	9% 1 5% 14% 40% 31%	450
	11th to 20th	Day	14% 2 4 16% 42% 22%	450
	21st to end	Day	8% 2 5% 22% 44% 20%	450
October	1st to 10th	Day	8% 2 12% 32% 36% 10%	450
	11th to 20th	Day	8% 3 10% 28% 34% 17%	450
	21st to end	Day	12% 5% 15% 27% 30% 11%	415
November	1st to 10th	Day	13% 3 11% 25% 39% 10%	270
	11th to 20th	Day	11% 5% 19% 32% 27% 4	270
	21st to end	Day	12% 3 21% 34% 24% 6%	270
December	1st to 10th	Day	17% 5% 24% 30% 20% 5%	270
	11th to 20th	Day	18% 6% 25% 33% 18% 1	270
	21st to end	Day	21% 5% 21% 35% 15% 3	297
January	1st to 10th	Night	15% 12% 32% 28% 12% 1	760
	11th to 20th	Night	14% 12% 26% 32% 15% 2	760
	21st to end	Night	20% 9% 33% 29% 9%	836
February	1st to 10th	Night	17% 9% 27% 33% 14% 1	760
	11th to 20th	Night	18% 8% 30% 29% 14% 1	743
	21st to end	Night	16% 6% 29% 36% 13%	628
March	1st to 10th	Night	13% 6% 27% 37% 16% 1	760
	11th to 20th	Night	11% 5% 25% 34% 21% 4	760
	21st to end	Night	11% 6% 21% 37% 23% 2	769
April	1st to 10th	Night	12% 6% 20% 35% 24% 3	540
	11th to 20th	Night	13% 4 23% 29% 29% 3	533
	21st to end	Night	7% 4 16% 33% 33% 8%	540
May	1st to 10th	Night	7% 3 14% 30% 36% 10%	540
	11th to 20th	Night	5% 1 10% 29% 41% 13%	531
	21st to end	Night	6% 2 7% 18% 49% 19%	584
June	1st to 10th	Night	8% 4 18% 51% 18%	540
	11th to 20th	Night	4 1 4 15% 51% 26%	540
	21st to end	Night	6% 1 3 12% 46% 31%	540
July	1st to 10th	Night	8% 3 10% 40% 39%	525
	11th to 20th	Night	5% 1 3 5% 35% 51%	522
	21st to end	Night	5% 1 2 9% 47% 37%	591
August	1st to 10th	Night	6% 1 1 7% 40% 45%	537
	11th to 20th	Night	8% 1 3 7% 42% 39%	534
	21st to end	Night	9% 2 5% 12% 43% 28%	594
September	1st to 10th	Night	8% 1 5% 15% 43% 27%	598
	11th to 20th	Night	11% 2 8% 19% 44% 16%	720
	21st to end	Night	11% 1 8% 23% 43% 13%	720
October	1st to 10th	Night	9% 3 13% 35% 33% 8%	720
	11th to 20th	Night	8% 4 14% 29% 34% 11%	720
	21st to end	Night	11% 4 18% 30% 32% 5%	792
November	1st to 10th	Night	10% 3 20% 35% 28% 5%	740
	11th to 20th	Night	11% 7% 25% 33% 23% 2	760
	21st to end	Night	13% 4 28% 31% 21% 3	760
December	1st to 10th	Night	15% 6% 25% 31% 18% 4	760
	11th to 20th	Night	16% 6% 29% 31% 17% 2	760
	21st to end	Night	22% 10% 23% 28% 16% 1	836

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