Infinity's Edge Observatory - FL
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Infinity's Edge Observatory - FL clear sky chart from 2005-11-06 to 2024-01-16.

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%	74935
	Night	8% 5% 3 6% 6% 4 6% 6% 7% 9% 41%	74879
Transparency	Day	26% 41% 11% 12% 8% 2	74658
	Night	25% 40% 11% 13% 8% 3	74675
Seeing	Day	7% 4 17% 27% 26% 19%	14632
	Night	9% 3 16% 30% 31% 11%	24783

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	11% 5% 3 4 5% 3 4 5% 8% 8% 43%	1706
	11th to 20th	Day	7% 5% 2 5% 5% 3 5% 5% 7% 10% 46%	1671
	21st to end	Day	11% 5% 3 7% 5% 3 6% 5% 6% 7% 43%	1782
February	1st to 10th	Day	10% 6% 2 5% 5% 3 5% 5% 6% 9% 44%	1785
	11th to 20th	Day	5% 4 2 4 5% 3 5% 4 6% 8% 54%	1780
	21st to end	Day	9% 6% 2 4 5% 3 5% 5% 5% 8% 49%	1628
March	1st to 10th	Day	4 4 1 4 5% 3 5% 5% 6% 9% 53%	1980
	11th to 20th	Day	6% 4 2 4 4 3 6% 5% 6% 10% 51%	1980
	21st to end	Day	6% 4 2 4 4 3 5% 5% 7% 8% 52%	2178
April	1st to 10th	Day	5% 3 2 4 5% 2 4 6% 7% 9% 52%	1980
	11th to 20th	Day	7% 4 2 6% 6% 4 6% 7% 8% 10% 40%	2049
	21st to end	Day	5% 3 2 4 6% 3 5% 5% 7% 9% 50%	2160
May	1st to 10th	Day	5% 3 1 3 4 2 4 4 7% 9% 56%	2160
	11th to 20th	Day	8% 5% 3 6% 6% 4 7% 6% 6% 9% 39%	2300
	21st to end	Day	8% 5% 3 6% 7% 5% 6% 7% 8% 11% 34%	2531
June	1st to 10th	Day	12% 7% 4 7% 7% 5% 7% 8% 8% 12% 23%	2340
	11th to 20th	Day	6% 4 2 6% 7% 5% 8% 9% 10% 12% 30%	2340
	21st to end	Day	7% 5% 3 7% 8% 4 7% 8% 9% 13% 30%	2340
July	1st to 10th	Day	8% 5% 3 6% 7% 5% 8% 9% 9% 12% 28%	2340
	11th to 20th	Day	8% 6% 3 6% 6% 4 8% 8% 10% 12% 28%	2340
	21st to end	Day	7% 5% 3 6% 7% 5% 8% 9% 9% 12% 28%	2547
August	1st to 10th	Day	5% 4 2 6% 6% 5% 7% 9% 11% 15% 31%	2327
	11th to 20th	Day	5% 4 2 6% 8% 5% 8% 8% 10% 15% 29%	2171
	21st to end	Day	8% 6% 3 7% 9% 4 7% 8% 9% 13% 26%	2246
September	1st to 10th	Day	6% 5% 3 7% 8% 5% 9% 9% 9% 12% 27%	1980
	11th to 20th	Day	7% 5% 3 7% 8% 6% 8% 8% 10% 12% 26%	1980
	21st to end	Day	9% 6% 3 7% 8% 5% 8% 8% 10% 10% 26%	1980
October	1st to 10th	Day	10% 6% 3 6% 7% 4 8% 7% 7% 11% 30%	1900
	11th to 20th	Day	7% 5% 2 6% 7% 5% 7% 5% 6% 10% 40%	1800
	21st to end	Day	9% 4 2 5% 6% 3 4 5% 7% 10% 45%	1980
November	1st to 10th	Day	8% 4 3 6% 5% 3 5% 7% 8% 10% 40%	1857
	11th to 20th	Day	10% 5% 3 5% 6% 3 5% 6% 8% 10% 38%	1900
	21st to end	Day	8% 6% 2 6% 7% 3 6% 6% 6% 10% 39%	1900
December	1st to 10th	Day	8% 5% 2 5% 6% 3 6% 6% 6% 10% 44%	1720
	11th to 20th	Day	11% 7% 3 5% 6% 3 6% 5% 6% 8% 41%	2153
	21st to end	Day	11% 6% 4 6% 7% 5% 7% 7% 7% 8% 31%	3124
January	1st to 10th	Night	10% 6% 2 5% 5% 3 4 4 6% 8% 46%	2459
	11th to 20th	Night	8% 6% 3 5% 5% 3 5% 6% 6% 10% 44%	2417
	21st to end	Night	11% 6% 2 6% 5% 3 5% 5% 7% 7% 43%	2574
February	1st to 10th	Night	10% 5% 3 6% 5% 3 4 5% 5% 8% 47%	2172
	11th to 20th	Night	9% 3 2 4 4 3 4 4 6% 8% 53%	2062
	21st to end	Night	8% 4 2 4 4 2 4 6% 6% 9% 52%	1628
March	1st to 10th	Night	5% 3 2 4 5% 2 5% 5% 5% 8% 57%	1980
	11th to 20th	Night	7% 3 2 4 4 2 4 4 5% 9% 55%	1980
	21st to end	Night	5% 3 2 4 4 3 5% 5% 7% 9% 52%	2178
April	1st to 10th	Night	5% 3 2 4 5% 3 4 4 6% 9% 56%	1980
	11th to 20th	Night	6% 5% 2 6% 5% 3 5% 7% 7% 9% 45%	1857
	21st to end	Night	6% 4 2 4 5% 3 6% 5% 6% 8% 52%	1800
May	1st to 10th	Night	6% 3 2 3 4 2 4 5% 5% 8% 58%	1800
	11th to 20th	Night	7% 5% 2 6% 5% 3 6% 6% 7% 10% 42%	1606
	21st to end	Night	7% 5% 3 5% 6% 4 7% 6% 9% 11% 37%	1744
June	1st to 10th	Night	11% 8% 3 7% 6% 4 8% 7% 8% 11% 28%	1620
	11th to 20th	Night	6% 5% 3 7% 7% 5% 7% 7% 8% 13% 33%	1620
	21st to end	Night	6% 6% 2 7% 7% 4 7% 7% 7% 12% 35%	1620
July	1st to 10th	Night	8% 6% 4 6% 7% 4 7% 7% 9% 12% 30%	1620
	11th to 20th	Night	6% 5% 4 6% 6% 5% 8% 7% 8% 12% 33%	1620
	21st to end	Night	4 5% 3 6% 7% 4 7% 6% 9% 13% 36%	1771
August	1st to 10th	Night	5% 4 2 5% 6% 4 7% 6% 11% 13% 37%	1611
	11th to 20th	Night	4 5% 2 6% 7% 4 6% 8% 12% 11% 35%	1709
	21st to end	Night	9% 7% 3 7% 8% 5% 8% 8% 7% 10% 28%	2106
September	1st to 10th	Night	6% 5% 3 8% 8% 4 8% 8% 9% 12% 28%	1980
	11th to 20th	Night	8% 8% 3 9% 8% 6% 6% 8% 8% 11% 27%	1980
	21st to end	Night	10% 8% 4 7% 9% 4 7% 5% 9% 9% 28%	1980
October	1st to 10th	Night	11% 7% 3 7% 7% 4 5% 6% 7% 11% 33%	2059
	11th to 20th	Night	7% 6% 3 7% 6% 3 5% 6% 6% 9% 43%	2160
	21st to end	Night	9% 6% 2 5% 5% 3 5% 5% 6% 10% 44%	2376
November	1st to 10th	Night	7% 5% 3 6% 8% 4 7% 5% 5% 8% 41%	2221
	11th to 20th	Night	9% 6% 3 6% 5% 4 5% 6% 7% 8% 41%	2280
	21st to end	Night	11% 6% 3 5% 6% 3 5% 6% 7% 9% 38%	2280
December	1st to 10th	Night	6% 4 3 6% 6% 4 5% 6% 6% 9% 47%	2455
	11th to 20th	Night	14% 8% 2 5% 5% 3 4 4 6% 7% 40%	3042
	21st to end	Night	11% 7% 3 8% 8% 4 6% 5% 6% 7% 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	22% 42% 7% 12% 14% 5%	1707
	11th to 20th	Day	21% 43% 5% 15% 12% 4	1671
	21st to end	Day	25% 39% 7% 12% 12% 5%	1782
February	1st to 10th	Day	24% 38% 7% 10% 15% 6%	1785
	11th to 20th	Day	21% 39% 10% 13% 11% 5%	1790
	21st to end	Day	19% 39% 7% 12% 19% 4	1628
March	1st to 10th	Day	17% 39% 8% 16% 15% 4	1980
	11th to 20th	Day	19% 38% 11% 18% 9% 4	1980
	21st to end	Day	17% 39% 10% 16% 14% 4	2178
April	1st to 10th	Day	19% 40% 11% 16% 11% 3	1980
	11th to 20th	Day	24% 39% 9% 14% 11% 2	2049
	21st to end	Day	20% 39% 9% 14% 14% 4	2160
May	1st to 10th	Day	14% 39% 12% 18% 16% 1	2160
	11th to 20th	Day	24% 42% 12% 13% 8%	2304
	21st to end	Day	29% 43% 10% 12% 5%	2531
June	1st to 10th	Day	34% 42% 11% 9% 3	2340
	11th to 20th	Day	25% 44% 15% 14% 2	2340
	21st to end	Day	33% 42% 13% 8% 3	2340
July	1st to 10th	Day	33% 45% 15% 6% 1	2275
	11th to 20th	Day	32% 46% 14% 7%	2271
	21st to end	Day	26% 47% 14% 12% 1	2405
August	1st to 10th	Day	22% 47% 22% 9% 1	2314
	11th to 20th	Day	26% 46% 19% 7% 1	2171
	21st to end	Day	33% 46% 12% 6% 2	2246
September	1st to 10th	Day	26% 47% 17% 8% 2	1980
	11th to 20th	Day	30% 46% 14% 7% 3	1980
	21st to end	Day	34% 44% 8% 7% 6% 1	1980
October	1st to 10th	Day	27% 41% 9% 12% 7% 4	1900
	11th to 20th	Day	26% 40% 8% 13% 11% 2	1800
	21st to end	Day	24% 39% 8% 13% 14% 3	1980
November	1st to 10th	Day	22% 42% 6% 10% 14% 6%	1857
	11th to 20th	Day	24% 41% 8% 14% 10% 3	1900
	21st to end	Day	23% 43% 9% 11% 11% 2	1900
December	1st to 10th	Day	23% 42% 10% 13% 9% 3	1720
	11th to 20th	Day	31% 36% 7% 9% 13% 4	2150
	21st to end	Day	36% 30% 9% 10% 10% 5%	3124
January	1st to 10th	Night	19% 41% 8% 14% 13% 5%	2459
	11th to 20th	Night	23% 42% 5% 15% 11% 4	2417
	21st to end	Night	26% 39% 8% 13% 7% 6%	2574
February	1st to 10th	Night	24% 38% 8% 10% 13% 7%	2172
	11th to 20th	Night	22% 39% 9% 15% 10% 5%	2063
	21st to end	Night	17% 38% 11% 14% 17% 3	1628
March	1st to 10th	Night	17% 37% 7% 19% 15% 5%	1980
	11th to 20th	Night	17% 38% 11% 20% 9% 4	1980
	21st to end	Night	16% 40% 9% 18% 13% 5%	2178
April	1st to 10th	Night	17% 39% 13% 16% 11% 5%	1980
	11th to 20th	Night	21% 39% 9% 15% 14% 2	1857
	21st to end	Night	21% 38% 10% 14% 13% 4	1800
May	1st to 10th	Night	14% 39% 10% 19% 16% 2	1800
	11th to 20th	Night	20% 44% 14% 15% 6% 1	1607
	21st to end	Night	27% 42% 11% 13% 7%	1745
June	1st to 10th	Night	32% 42% 12% 10% 4	1620
	11th to 20th	Night	25% 42% 14% 15% 3	1620
	21st to end	Night	30% 43% 13% 11% 3	1620
July	1st to 10th	Night	32% 44% 14% 8% 1	1575
	11th to 20th	Night	33% 46% 13% 8% 1	1566
	21st to end	Night	22% 46% 21% 10% 1	1672
August	1st to 10th	Night	22% 45% 23% 10%	1600
	11th to 20th	Night	27% 43% 21% 8% 1	1709
	21st to end	Night	34% 43% 14% 8% 2	2106
September	1st to 10th	Night	29% 45% 14% 9% 2	1980
	11th to 20th	Night	34% 46% 12% 8% 1	1980
	21st to end	Night	33% 43% 10% 8% 5% 1	1980
October	1st to 10th	Night	27% 39% 10% 13% 8% 3	2059
	11th to 20th	Night	27% 38% 9% 15% 9% 3	2160
	21st to end	Night	22% 40% 9% 12% 13% 4	2376
November	1st to 10th	Night	24% 41% 6% 11% 14% 5%	2221
	11th to 20th	Night	24% 42% 8% 15% 8% 4	2280
	21st to end	Night	25% 42% 8% 11% 11% 2	2280
December	1st to 10th	Night	21% 42% 9% 17% 7% 4	2455
	11th to 20th	Night	32% 36% 8% 10% 8% 5%	3044
	21st to end	Night	36% 29% 8% 11% 11% 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	11% 7% 38% 28% 14% 2	270
	11th to 20th	Day	6% 7% 36% 31% 18% 3	257
	21st to end	Day	14% 10% 45% 23% 8%	264
February	1st to 10th	Day	13% 6% 31% 31% 18% 2	240
	11th to 20th	Day	8% 4 28% 35% 20% 6%	272
	21st to end	Day	8% 3 28% 35% 22% 3	346
March	1st to 10th	Day	6% 6% 32% 39% 16% 2	420
	11th to 20th	Day	7% 5% 28% 34% 21% 4	420
	21st to end	Day	5% 5% 27% 35% 24% 5%	462
April	1st to 10th	Day	3 5% 33% 33% 20% 6%	420
	11th to 20th	Day	8% 8% 24% 33% 22% 5%	412
	21st to end	Day	5% 4 18% 38% 25% 10%	420
May	1st to 10th	Day	5% 2 18% 36% 28% 12%	423
	11th to 20th	Day	9% 3 13% 28% 32% 15%	447
	21st to end	Day	9% 2 10% 25% 32% 23%	485
June	1st to 10th	Day	13% 2 8% 24% 31% 22%	450
	11th to 20th	Day	5% 1 6% 20% 32% 35%	450
	21st to end	Day	5% 1 4 15% 29% 45%	450
July	1st to 10th	Day	4 1 4 10% 31% 50%	445
	11th to 20th	Day	5% 1 2 7% 39% 46%	444
	21st to end	Day	6% 2 6% 15% 29% 43%	488
August	1st to 10th	Day	3 2 4 12% 34% 44%	446
	11th to 20th	Day	4 4 11% 32% 49%	439
	21st to end	Day	8% 2 5% 16% 33% 36%	495
September	1st to 10th	Day	7% 3 4 14% 32% 41%	450
	11th to 20th	Day	8% 2 9% 18% 32% 32%	450
	21st to end	Day	9% 2 5% 23% 34% 27%	450
October	1st to 10th	Day	16% 3 12% 29% 30% 10%	450
	11th to 20th	Day	6% 4 15% 36% 31% 9%	450
	21st to end	Day	7% 2 19% 36% 29% 8%	495
November	1st to 10th	Day	8% 7% 19% 36% 22% 8%	455
	11th to 20th	Day	11% 5% 23% 35% 22% 3	460
	21st to end	Day	8% 3 24% 40% 22% 4	460
December	1st to 10th	Day	6% 5% 23% 40% 19% 5%	280
	11th to 20th	Day	8% 6% 27% 37% 18% 4	270
	21st to end	Day	7% 7% 27% 38% 18% 4	297
January	1st to 10th	Night	13% 6% 25% 37% 17% 2	760
	11th to 20th	Night	9% 7% 26% 39% 18% 2	744
	21st to end	Night	11% 7% 30% 38% 13% 1	792
February	1st to 10th	Night	13% 6% 23% 39% 19% 1	720
	11th to 20th	Night	8% 6% 27% 39% 17% 2	703
	21st to end	Night	9% 4 24% 43% 20%	592
March	1st to 10th	Night	5% 5% 31% 43% 14% 1	720
	11th to 20th	Night	8% 4 25% 39% 23% 2	720
	21st to end	Night	6% 3 25% 41% 23% 1	792
April	1st to 10th	Night	5% 4 24% 43% 21% 2	720
	11th to 20th	Night	7% 4 22% 43% 23% 2	711
	21st to end	Night	7% 2 18% 47% 23% 3	720
May	1st to 10th	Night	6% 3 14% 46% 29% 2	720
	11th to 20th	Night	10% 1 10% 35% 37% 7%	545
	21st to end	Night	7% 2 6% 26% 47% 11%	584
June	1st to 10th	Night	12% 2 5% 23% 47% 11%	540
	11th to 20th	Night	6% 2 4 17% 48% 24%	540
	21st to end	Night	6% 2 2 12% 47% 31%	540
July	1st to 10th	Night	9% 2 2 8% 45% 33%	525
	11th to 20th	Night	7% 2 2 7% 44% 39%	522
	21st to end	Night	6% 1 2 7% 49% 35%	591
August	1st to 10th	Night	4 1 3 7% 49% 36%	537
	11th to 20th	Night	4 1 2 8% 47% 38%	645
	21st to end	Night	11% 2 5% 14% 41% 26%	792
September	1st to 10th	Night	8% 2 4 12% 47% 27%	720
	11th to 20th	Night	10% 2 6% 17% 44% 23%	720
	21st to end	Night	13% 3 5% 20% 42% 18%	720
October	1st to 10th	Night	15% 2 10% 30% 37% 6%	720
	11th to 20th	Night	8% 3 10% 31% 41% 8%	720
	21st to end	Night	13% 2 16% 31% 32% 6%	792
November	1st to 10th	Night	11% 3 20% 33% 29% 6%	740
	11th to 20th	Night	10% 4 21% 37% 23% 4	760
	21st to end	Night	13% 5% 18% 41% 21% 3	760
December	1st to 10th	Night	6% 3 22% 37% 28% 3	760
	11th to 20th	Night	11% 6% 22% 34% 24% 3	760
	21st to end	Night	9% 5% 24% 36% 24% 2	836

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