Eastern Florida State College
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Eastern Florida State College clear sky chart from 2005-11-06 to 2024-02-15.

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	9% 5% 3 6% 7% 4 6% 6% 7% 10% 37%	78713
	Night	9% 6% 3 6% 6% 3 5% 6% 7% 9% 41%	80366
Transparency	Day	28% 39% 9% 12% 9% 3	78436
	Night	27% 37% 10% 13% 9% 3	80162
Seeing	Day	8% 5% 19% 26% 24% 17%	14684
	Night	9% 4 18% 31% 30% 9%	24863

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% 3 5% 4 5% 7% 43%	2836
	11th to 20th	Day	16% 10% 3 7% 5% 3 4 4 5% 7% 34%	2840
	21st to end	Day	12% 6% 3 6% 6% 4 5% 4 6% 8% 41%	3124
February	1st to 10th	Day	11% 6% 3 5% 5% 3 5% 5% 6% 9% 42%	1885
	11th to 20th	Day	5% 4 2 4 5% 3 5% 4 6% 9% 52%	1807
	21st to end	Day	9% 4 2 5% 5% 3 5% 5% 6% 8% 47%	1628
March	1st to 10th	Day	5% 3 2 5% 6% 3 4 5% 6% 9% 53%	1980
	11th to 20th	Day	8% 4 2 4 5% 3 6% 5% 5% 8% 49%	1980
	21st to end	Day	6% 4 2 4 5% 3 5% 4 7% 9% 51%	2178
April	1st to 10th	Day	5% 3 1 5% 6% 3 6% 6% 7% 9% 49%	1980
	11th to 20th	Day	8% 6% 2 6% 6% 4 6% 8% 7% 9% 39%	2046
	21st to end	Day	5% 4 2 3 5% 3 6% 6% 7% 10% 48%	2160
May	1st to 10th	Day	6% 4 1 4 4 3 4 5% 6% 9% 55%	2183
	11th to 20th	Day	8% 6% 2 7% 7% 4 6% 6% 7% 9% 38%	2301
	21st to end	Day	8% 5% 3 7% 8% 5% 8% 7% 7% 9% 34%	2531
June	1st to 10th	Day	12% 7% 3 7% 9% 4 8% 8% 9% 11% 22%	2340
	11th to 20th	Day	7% 3 3 6% 8% 6% 9% 9% 10% 11% 28%	2340
	21st to end	Day	9% 5% 4 7% 7% 5% 8% 8% 9% 11% 27%	2340
July	1st to 10th	Day	8% 6% 3 7% 9% 5% 8% 8% 10% 11% 25%	2340
	11th to 20th	Day	8% 6% 3 7% 8% 6% 8% 7% 9% 11% 27%	2340
	21st to end	Day	7% 6% 4 7% 8% 5% 8% 8% 8% 12% 26%	2547
August	1st to 10th	Day	6% 4 3 6% 7% 5% 8% 10% 9% 15% 28%	2327
	11th to 20th	Day	5% 5% 2 7% 9% 5% 8% 8% 10% 12% 27%	2187
	21st to end	Day	10% 7% 3 8% 7% 5% 7% 8% 10% 12% 24%	2238
September	1st to 10th	Day	7% 6% 4 7% 9% 6% 8% 8% 9% 12% 24%	1980
	11th to 20th	Day	8% 6% 3 9% 8% 6% 9% 7% 9% 11% 24%	1980
	21st to end	Day	10% 6% 2 7% 9% 5% 8% 8% 9% 9% 27%	1980
October	1st to 10th	Day	11% 6% 3 8% 8% 5% 7% 8% 7% 9% 30%	1904
	11th to 20th	Day	7% 5% 2 7% 6% 4 6% 5% 7% 10% 41%	1800
	21st to end	Day	8% 4 2 5% 4 4 5% 6% 7% 9% 45%	1980
November	1st to 10th	Day	8% 5% 2 6% 6% 3 6% 6% 7% 10% 40%	1857
	11th to 20th	Day	8% 6% 3 6% 7% 3 6% 5% 7% 8% 41%	1900
	21st to end	Day	8% 5% 3 6% 7% 5% 6% 5% 6% 11% 38%	1887
December	1st to 10th	Day	8% 5% 3 6% 6% 3 5% 5% 6% 10% 43%	1710
	11th to 20th	Day	12% 5% 3 6% 6% 4 5% 5% 5% 8% 41%	2153
	21st to end	Day	11% 7% 3 6% 8% 5% 6% 6% 7% 8% 32%	3124
January	1st to 10th	Night	11% 7% 3 6% 6% 3 6% 5% 6% 7% 41%	4109
	11th to 20th	Night	17% 11% 4 7% 6% 3 5% 4 5% 8% 31%	4120
	21st to end	Night	10% 6% 3 6% 6% 4 5% 6% 6% 7% 41%	4532
February	1st to 10th	Night	10% 6% 3 5% 5% 2 4 5% 6% 8% 46%	2290
	11th to 20th	Night	10% 4 1 4 4 3 4 5% 6% 8% 52%	2131
	21st to end	Night	8% 4 2 4 3 3 4 6% 5% 8% 54%	1628
March	1st to 10th	Night	5% 2 1 4 4 3 5% 4 5% 7% 59%	1980
	11th to 20th	Night	7% 4 2 4 4 3 4 4 5% 9% 54%	1980
	21st to end	Night	5% 3 2 4 5% 3 5% 4 6% 9% 53%	2178
April	1st to 10th	Night	6% 3 2 4 4 3 4 5% 6% 9% 55%	1980
	11th to 20th	Night	6% 4 3 6% 5% 3 5% 5% 7% 10% 46%	1861
	21st to end	Night	5% 4 2 4 5% 3 6% 5% 6% 8% 53%	1800
May	1st to 10th	Night	5% 3 2 3 4 2 4 5% 6% 8% 58%	1789
	11th to 20th	Night	7% 5% 2 5% 5% 3 6% 6% 7% 9% 44%	1592
	21st to end	Night	7% 4 4 6% 5% 3 6% 7% 9% 12% 37%	1744
June	1st to 10th	Night	10% 8% 2 7% 7% 4 5% 6% 9% 11% 29%	1620
	11th to 20th	Night	6% 6% 3 6% 7% 4 7% 7% 10% 14% 31%	1620
	21st to end	Night	6% 5% 3 6% 8% 4 7% 6% 7% 13% 35%	1620
July	1st to 10th	Night	7% 7% 3 6% 6% 4 6% 8% 10% 10% 32%	1620
	11th to 20th	Night	7% 5% 2 6% 8% 5% 7% 7% 9% 10% 34%	1620
	21st to end	Night	6% 5% 2 5% 7% 5% 7% 7% 8% 12% 36%	1771
August	1st to 10th	Night	4 4 2 6% 7% 4 7% 8% 9% 14% 36%	1611
	11th to 20th	Night	4 5% 3 6% 6% 5% 6% 9% 11% 11% 34%	1695
	21st to end	Night	9% 6% 3 7% 8% 5% 7% 8% 8% 10% 29%	2112
September	1st to 10th	Night	7% 5% 3 7% 7% 4 7% 8% 10% 13% 28%	1980
	11th to 20th	Night	9% 7% 4 9% 8% 5% 7% 7% 7% 11% 27%	1980
	21st to end	Night	9% 8% 4 7% 7% 5% 7% 8% 8% 10% 28%	1980
October	1st to 10th	Night	10% 6% 3 7% 6% 4 5% 6% 6% 9% 36%	2053
	11th to 20th	Night	7% 5% 2 6% 5% 3 6% 6% 6% 8% 47%	2160
	21st to end	Night	9% 6% 2 5% 5% 3 5% 5% 6% 9% 45%	2376
November	1st to 10th	Night	8% 5% 2 6% 6% 3 5% 6% 6% 8% 45%	2221
	11th to 20th	Night	8% 5% 3 6% 6% 3 6% 6% 7% 8% 43%	2280
	21st to end	Night	10% 5% 3 7% 6% 3 5% 5% 7% 9% 39%	2289
December	1st to 10th	Night	6% 3 2 5% 5% 3 6% 5% 7% 10% 47%	2470
	11th to 20th	Night	13% 7% 3 5% 6% 3 4 5% 5% 7% 42%	3042
	21st to end	Night	12% 7% 4 7% 7% 4 6% 5% 6% 8% 34%	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% 26% 5% 13% 19% 5%	2837
	11th to 20th	Day	44% 25% 3 13% 12% 3	2840
	21st to end	Day	33% 27% 6% 14% 15% 6%	3124
February	1st to 10th	Day	27% 35% 6% 11% 16% 5%	1885
	11th to 20th	Day	22% 37% 8% 14% 13% 6%	1817
	21st to end	Day	21% 36% 7% 11% 20% 4	1628
March	1st to 10th	Day	18% 38% 7% 16% 17% 5%	1980
	11th to 20th	Day	21% 38% 9% 18% 9% 5%	1980
	21st to end	Day	18% 39% 8% 17% 14% 4	2178
April	1st to 10th	Day	20% 38% 9% 17% 12% 4	1980
	11th to 20th	Day	26% 39% 8% 12% 12% 3	2046
	21st to end	Day	21% 39% 8% 14% 14% 5%	2160
May	1st to 10th	Day	16% 38% 10% 18% 17% 2	2183
	11th to 20th	Day	24% 41% 11% 14% 9%	2305
	21st to end	Day	30% 42% 8% 12% 7%	2531
June	1st to 10th	Day	35% 41% 9% 11% 4	2340
	11th to 20th	Day	27% 44% 15% 13% 2	2340
	21st to end	Day	34% 42% 12% 9% 3	2340
July	1st to 10th	Day	35% 45% 12% 7% 2	2275
	11th to 20th	Day	34% 44% 12% 9% 1	2271
	21st to end	Day	28% 45% 15% 11% 1	2405
August	1st to 10th	Day	25% 44% 20% 10% 1	2314
	11th to 20th	Day	29% 44% 19% 7% 1	2187
	21st to end	Day	34% 45% 11% 7% 3	2238
September	1st to 10th	Day	31% 43% 15% 10% 2	1980
	11th to 20th	Day	33% 44% 13% 8% 3	1980
	21st to end	Day	35% 41% 8% 7% 7% 1	1980
October	1st to 10th	Day	29% 40% 7% 11% 9% 4	1904
	11th to 20th	Day	28% 37% 6% 14% 11% 3	1800
	21st to end	Day	23% 39% 6% 12% 15% 4	1980
November	1st to 10th	Day	23% 41% 4 11% 15% 6%	1857
	11th to 20th	Day	23% 41% 6% 14% 12% 4	1900
	21st to end	Day	25% 41% 7% 12% 13% 3	1887
December	1st to 10th	Day	23% 41% 9% 14% 10% 3	1710
	11th to 20th	Day	32% 35% 6% 9% 13% 5%	2150
	21st to end	Day	37% 28% 7% 11% 11% 6%	3124
January	1st to 10th	Night	32% 28% 7% 14% 16% 4	4109
	11th to 20th	Night	46% 26% 5% 13% 8% 3	4120
	21st to end	Night	31% 27% 9% 14% 11% 8%	4532
February	1st to 10th	Night	25% 36% 7% 11% 13% 9%	2290
	11th to 20th	Night	23% 38% 8% 15% 10% 6%	2132
	21st to end	Night	18% 38% 10% 14% 17% 4	1628
March	1st to 10th	Night	16% 37% 7% 19% 16% 5%	1980
	11th to 20th	Night	18% 37% 10% 20% 9% 5%	1980
	21st to end	Night	16% 38% 10% 18% 13% 5%	2178
April	1st to 10th	Night	17% 38% 13% 16% 11% 5%	1980
	11th to 20th	Night	22% 38% 9% 15% 14% 2	1861
	21st to end	Night	20% 38% 9% 14% 14% 6%	1800
May	1st to 10th	Night	15% 39% 10% 19% 15% 2	1789
	11th to 20th	Night	21% 42% 15% 15% 7% 1	1593
	21st to end	Night	27% 41% 12% 12% 8%	1745
June	1st to 10th	Night	31% 40% 13% 12% 4	1620
	11th to 20th	Night	25% 42% 14% 16% 2	1620
	21st to end	Night	30% 42% 13% 12% 4	1620
July	1st to 10th	Night	32% 44% 15% 8% 1	1575
	11th to 20th	Night	34% 45% 12% 9%	1566
	21st to end	Night	24% 44% 21% 10% 1	1672
August	1st to 10th	Night	23% 45% 21% 9% 1	1600
	11th to 20th	Night	26% 44% 20% 8% 2	1695
	21st to end	Night	35% 43% 13% 8% 2	2112
September	1st to 10th	Night	29% 45% 15% 10% 2	1980
	11th to 20th	Night	36% 42% 13% 8% 1	1980
	21st to end	Night	34% 40% 10% 8% 6% 2	1980
October	1st to 10th	Night	28% 38% 9% 14% 8% 4	2053
	11th to 20th	Night	26% 38% 7% 16% 10% 3	2160
	21st to end	Night	23% 40% 7% 12% 14% 5%	2376
November	1st to 10th	Night	23% 41% 5% 11% 14% 5%	2221
	11th to 20th	Night	24% 41% 8% 14% 9% 5%	2280
	21st to end	Night	26% 41% 7% 12% 12% 2	2289
December	1st to 10th	Night	20% 42% 9% 16% 7% 5%	2470
	11th to 20th	Night	32% 34% 8% 11% 10% 6%	3044
	21st to end	Night	36% 28% 7% 12% 12% 4	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	13% 10% 42% 26% 7% 2	270
	11th to 20th	Day	7% 12% 42% 23% 11% 4	270
	21st to end	Day	15% 15% 42% 22% 6%	297
February	1st to 10th	Day	11% 12% 37% 26% 11% 2	270
	11th to 20th	Day	6% 9% 35% 33% 13% 4	271
	21st to end	Day	9% 7% 31% 31% 19% 3	346
March	1st to 10th	Day	6% 10% 34% 35% 13% 2	420
	11th to 20th	Day	10% 8% 27% 33% 20% 3	420
	21st to end	Day	6% 8% 27% 33% 22% 4	462
April	1st to 10th	Day	6% 8% 34% 30% 16% 5%	420
	11th to 20th	Day	7% 11% 26% 30% 20% 6%	412
	21st to end	Day	7% 5% 25% 32% 23% 9%	420
May	1st to 10th	Day	6% 5% 23% 31% 25% 10%	423
	11th to 20th	Day	10% 3 17% 27% 27% 16%	447
	21st to end	Day	9% 3 11% 24% 29% 23%	485
June	1st to 10th	Day	13% 3 11% 24% 29% 20%	450
	11th to 20th	Day	6% 2 6% 23% 32% 32%	450
	21st to end	Day	5% 2 7% 14% 33% 39%	450
July	1st to 10th	Day	5% 1 4 11% 30% 49%	445
	11th to 20th	Day	5% 1 3 10% 38% 43%	444
	21st to end	Day	7% 1 6% 17% 30% 38%	488
August	1st to 10th	Day	4 1 6% 16% 34% 39%	446
	11th to 20th	Day	3 1 7% 14% 29% 47%	439
	21st to end	Day	9% 2 6% 17% 33% 33%	495
September	1st to 10th	Day	9% 2 5% 18% 28% 38%	450
	11th to 20th	Day	8% 2 8% 24% 30% 28%	450
	21st to end	Day	8% 1 8% 24% 35% 23%	450
October	1st to 10th	Day	14% 4 18% 32% 24% 9%	450
	11th to 20th	Day	5% 5% 17% 35% 31% 7%	450
	21st to end	Day	7% 3 22% 38% 24% 7%	495
November	1st to 10th	Day	10% 6% 20% 36% 21% 6%	455
	11th to 20th	Day	11% 7% 29% 30% 19% 4	460
	21st to end	Day	9% 5% 26% 40% 18% 2	447
December	1st to 10th	Day	5% 9% 35% 33% 15% 3	270
	11th to 20th	Day	10% 6% 35% 32% 14% 3	270
	21st to end	Day	6% 11% 28% 36% 17% 2	297
January	1st to 10th	Night	13% 7% 28% 34% 16% 2	760
	11th to 20th	Night	11% 7% 27% 38% 16% 2	760
	21st to end	Night	11% 9% 34% 35% 11%	836
February	1st to 10th	Night	11% 8% 26% 38% 16% 1	760
	11th to 20th	Night	10% 7% 30% 36% 16% 1	722
	21st to end	Night	9% 4 30% 44% 13%	592
March	1st to 10th	Night	4 7% 32% 42% 14% 1	720
	11th to 20th	Night	8% 5% 27% 40% 19% 2	720
	21st to end	Night	6% 5% 30% 41% 19% 1	792
April	1st to 10th	Night	5% 5% 27% 41% 19% 1	720
	11th to 20th	Night	7% 5% 24% 41% 22% 1	711
	21st to end	Night	6% 3 22% 45% 21% 3	720
May	1st to 10th	Night	6% 3 17% 47% 26% 1	709
	11th to 20th	Night	8% 2 12% 33% 39% 6%	531
	21st to end	Night	8% 2 6% 30% 44% 11%	584
June	1st to 10th	Night	12% 2 5% 27% 44% 9%	540
	11th to 20th	Night	7% 1 4 18% 46% 23%	540
	21st to end	Night	6% 1 4 17% 47% 26%	540
July	1st to 10th	Night	7% 1 4 13% 47% 28%	525
	11th to 20th	Night	7% 1 2 9% 46% 35%	522
	21st to end	Night	5% 2 2 10% 49% 32%	591
August	1st to 10th	Night	4 3 12% 52% 30%	537
	11th to 20th	Night	4 1 3 10% 48% 33%	631
	21st to end	Night	10% 1 6% 19% 40% 24%	792
September	1st to 10th	Night	9% 1 5% 16% 44% 25%	720
	11th to 20th	Night	10% 1 6% 19% 45% 18%	720
	21st to end	Night	13% 1 8% 21% 43% 15%	720
October	1st to 10th	Night	13% 2 14% 31% 34% 6%	720
	11th to 20th	Night	7% 3 12% 31% 40% 7%	720
	21st to end	Night	11% 3 17% 33% 31% 5%	792
November	1st to 10th	Night	9% 3 22% 32% 29% 5%	740
	11th to 20th	Night	8% 6% 23% 37% 24% 3	760
	21st to end	Night	12% 4 24% 39% 20% 2	760
December	1st to 10th	Night	6% 3 24% 36% 28% 3	760
	11th to 20th	Night	10% 7% 23% 35% 23% 2	760
	21st to end	Night	10% 5% 26% 36% 21% 2	836

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