Beauclerc / San Jose(FL)
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Beauclerc / San Jose(FL) clear sky chart from 2005-11-06 to 2025-07-21.

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% 2 7% 5% 5% 5% 5% 7% 9% 40%	120242
	Night	9% 6% 2 6% 5% 4 5% 4 6% 9% 43%	118885
Transparency	Day	37% 8% 15% 19% 15% 6%	123982
	Night	36% 7% 15% 19% 16% 7%	123269
Seeing	Day	11% 6% 19% 25% 23% 16%	16404
	Night	12% 6% 19% 32% 26% 6%	26468

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	8% 6% 2 5% 3 2 3 3 4 6% 58%	4056
	11th to 20th	Day	18% 9% 3 8% 5% 3 3 2 4 5% 38%	4060
	21st to end	Day	11% 8% 2 6% 3 3 4 3 5% 7% 48%	4466
February	1st to 10th	Day	14% 8% 3 6% 5% 4 4 3 4 6% 44%	1995
	11th to 20th	Day	12% 5% 3 5% 4 4 3 4 5% 6% 49%	1948
	21st to end	Day	12% 6% 3 6% 4 3 3 4 5% 6% 48%	1731
March	1st to 10th	Day	12% 8% 3 8% 4 4 4 4 5% 7% 40%	4935
	11th to 20th	Day	7% 4 1 4 3 3 4 4 6% 8% 58%	4980
	21st to end	Day	11% 6% 2 5% 3 4 4 4 6% 8% 47%	5465
April	1st to 10th	Day	8% 5% 2 5% 5% 4 5% 4 7% 8% 49%	2200
	11th to 20th	Day	9% 5% 2 7% 4 4 5% 5% 6% 8% 45%	2245
	21st to end	Day	5% 4 1 5% 4 5% 5% 4 7% 8% 52%	2430
May	1st to 10th	Day	7% 4 2 6% 5% 5% 5% 5% 7% 10% 44%	5862
	11th to 20th	Day	9% 5% 2 6% 4 4 5% 4 6% 9% 43%	5861
	21st to end	Day	4 4 1 5% 5% 5% 6% 5% 8% 12% 43%	6433
June	1st to 10th	Day	10% 6% 2 8% 7% 7% 7% 6% 8% 10% 28%	2600
	11th to 20th	Day	6% 4 2 7% 6% 7% 7% 6% 10% 12% 32%	2600
	21st to end	Day	6% 6% 3 8% 7% 6% 8% 6% 9% 11% 30%	2600
July	1st to 10th	Day	7% 6% 3 9% 7% 8% 8% 7% 11% 12% 22%	4250
	11th to 20th	Day	4 5% 2 8% 7% 7% 8% 7% 10% 14% 28%	4250
	21st to end	Day	4 5% 3 7% 7% 7% 8% 7% 11% 15% 27%	4466
August	1st to 10th	Day	11% 6% 2 9% 6% 7% 8% 6% 9% 11% 25%	4104
	11th to 20th	Day	6% 5% 2 6% 6% 6% 6% 6% 8% 13% 36%	4017
	21st to end	Day	8% 6% 3 9% 7% 7% 7% 6% 9% 11% 27%	3841
September	1st to 10th	Day	10% 8% 3 10% 7% 8% 7% 7% 8% 10% 23%	2090
	11th to 20th	Day	13% 7% 3 8% 8% 8% 7% 6% 7% 10% 23%	2090
	21st to end	Day	14% 7% 3 8% 5% 5% 5% 5% 6% 8% 34%	2090
October	1st to 10th	Day	12% 7% 3 7% 6% 5% 6% 5% 8% 7% 34%	2051
	11th to 20th	Day	8% 6% 2 5% 4 5% 4 4 6% 7% 50%	1900
	21st to end	Day	8% 6% 3 6% 4 3 4 3 6% 7% 50%	2090
November	1st to 10th	Day	11% 6% 2 6% 3 4 5% 4 6% 8% 45%	1957
	11th to 20th	Day	11% 7% 3 7% 6% 5% 5% 4 6% 7% 41%	2000
	21st to end	Day	11% 7% 2 7% 5% 4 3 3 6% 8% 44%	1810
December	1st to 10th	Day	6% 4 1 5% 4 3 4 4 6% 8% 54%	2930
	11th to 20th	Day	13% 8% 3 7% 5% 5% 4 5% 6% 8% 38%	3373
	21st to end	Day	14% 9% 3 8% 5% 3 4 3 5% 7% 41%	4466
January	1st to 10th	Night	8% 7% 2 4 3 2 2 2 4 6% 58%	5889
	11th to 20th	Night	17% 8% 3 7% 5% 5% 5% 4 6% 7% 34%	5900
	21st to end	Night	13% 7% 2 6% 4 3 4 4 5% 8% 43%	6490
February	1st to 10th	Night	13% 6% 2 6% 5% 4 4 3 4 6% 46%	2400
	11th to 20th	Night	12% 6% 2 6% 5% 4 4 3 5% 6% 47%	2338
	21st to end	Night	11% 7% 2 6% 4 4 4 3 5% 6% 48%	1896
March	1st to 10th	Night	16% 10% 3 6% 4 4 3 3 5% 5% 42%	4918
	11th to 20th	Night	5% 4 2 4 3 3 3 4 6% 10% 55%	4980
	21st to end	Night	9% 6% 2 6% 4 4 4 4 5% 7% 50%	5467
April	1st to 10th	Night	7% 6% 2 4 5% 4 5% 4 5% 9% 49%	2200
	11th to 20th	Night	8% 7% 2 5% 4 3 3 4 5% 6% 53%	2101
	21st to end	Night	5% 4 2 4 4 4 4 4 8% 8% 53%	1985
May	1st to 10th	Night	4 4 2 6% 4 5% 5% 4 6% 10% 48%	4033
	11th to 20th	Night	9% 5% 2 6% 4 4 3 4 8% 11% 43%	4032
	21st to end	Night	4 4 2 5% 4 4 5% 4 7% 12% 49%	4421
June	1st to 10th	Night	10% 5% 2 6% 5% 5% 6% 5% 9% 13% 35%	1800
	11th to 20th	Night	5% 6% 2 6% 6% 7% 6% 6% 10% 12% 35%	1800
	21st to end	Night	7% 6% 2 6% 5% 5% 6% 6% 9% 14% 35%	1800
July	1st to 10th	Night	6% 6% 3 9% 8% 7% 8% 5% 9% 11% 29%	2930
	11th to 20th	Night	3 4 2 8% 6% 7% 7% 6% 9% 15% 32%	2930
	21st to end	Night	6% 6% 2 8% 6% 7% 7% 7% 11% 13% 27%	3087
August	1st to 10th	Night	9% 6% 3 9% 6% 7% 7% 6% 9% 12% 27%	2825
	11th to 20th	Night	4 5% 2 6% 5% 5% 7% 6% 8% 12% 40%	2785
	21st to end	Night	7% 6% 2 6% 6% 6% 6% 4 7% 12% 38%	3804
September	1st to 10th	Night	10% 8% 2 8% 7% 5% 7% 6% 8% 12% 27%	2090
	11th to 20th	Night	10% 8% 3 8% 6% 7% 8% 5% 8% 10% 26%	2090
	21st to end	Night	10% 6% 3 6% 6% 5% 5% 4 8% 10% 38%	2090
October	1st to 10th	Night	11% 6% 3 7% 4 5% 5% 4 5% 8% 40%	2128
	11th to 20th	Night	7% 5% 2 4 4 4 4 4 5% 8% 54%	2280
	21st to end	Night	7% 5% 2 6% 5% 4 4 4 5% 7% 52%	2508
November	1st to 10th	Night	11% 5% 2 5% 4 4 4 4 5% 9% 46%	2341
	11th to 20th	Night	10% 7% 2 6% 4 5% 5% 4 5% 7% 46%	2400
	21st to end	Night	11% 7% 2 6% 4 5% 4 3 5% 7% 46%	2585
December	1st to 10th	Night	10% 5% 2 5% 3 3 4 3 5% 7% 53%	4250
	11th to 20th	Night	12% 8% 3 7% 4 4 4 3 5% 5% 44%	4822
	21st to end	Night	12% 9% 3 7% 5% 4 4 4 5% 7% 40%	6490

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% 3 8% 17% 28% 15%	4057
	11th to 20th	Day	49% 2 5% 13% 20% 11%	4060
	21st to end	Day	35% 5% 9% 24% 17% 10%	4466
February	1st to 10th	Day	42% 5% 8% 15% 21% 10%	1995
	11th to 20th	Day	35% 5% 9% 17% 22% 12%	1958
	21st to end	Day	36% 5% 10% 18% 18% 12%	1731
March	1st to 10th	Day	43% 5% 10% 15% 19% 7%	4935
	11th to 20th	Day	24% 5% 12% 19% 21% 19%	4980
	21st to end	Day	34% 5% 9% 23% 18% 10%	5465
April	1st to 10th	Day	32% 6% 11% 21% 19% 11%	2200
	11th to 20th	Day	36% 6% 8% 20% 21% 9%	2245
	21st to end	Day	26% 7% 12% 25% 23% 7%	2430
May	1st to 10th	Day	30% 11% 16% 27% 13% 3	5897
	11th to 20th	Day	35% 6% 16% 29% 13% 1	5865
	21st to end	Day	28% 9% 17% 30% 14% 2	6447
June	1st to 10th	Day	45% 11% 18% 17% 9% 1	2600
	11th to 20th	Day	37% 14% 22% 22% 5%	2600
	21st to end	Day	43% 13% 24% 14% 6%	2600
July	1st to 10th	Day	44% 17% 25% 13% 1	4185
	11th to 20th	Day	39% 16% 34% 9% 2	4181
	21st to end	Day	37% 18% 33% 11% 1	4324
August	1st to 10th	Day	46% 13% 27% 11% 1	4091
	11th to 20th	Day	34% 13% 24% 20% 9%	4056
	21st to end	Day	43% 14% 20% 21% 2	3841
September	1st to 10th	Day	50% 14% 17% 12% 6% 1	2090
	11th to 20th	Day	53% 11% 17% 13% 6%	2090
	21st to end	Day	47% 7% 14% 17% 13% 2	2090
October	1st to 10th	Day	51% 7% 9% 12% 16% 6%	3402
	11th to 20th	Day	31% 4 7% 16% 33% 10%	3140
	21st to end	Day	25% 4 7% 21% 34% 8%	3428
November	1st to 10th	Day	36% 6% 11% 20% 16% 10%	1957
	11th to 20th	Day	42% 5% 9% 15% 20% 10%	2000
	21st to end	Day	39% 4 9% 20% 21% 8%	1810
December	1st to 10th	Day	28% 5% 13% 26% 19% 9%	2930
	11th to 20th	Day	44% 7% 10% 15% 18% 7%	3370
	21st to end	Day	44% 5% 7% 20% 18% 6%	4466
January	1st to 10th	Night	28% 4 7% 14% 35% 13%	5889
	11th to 20th	Night	49% 3 6% 15% 19% 7%	5900
	21st to end	Night	39% 6% 10% 19% 16% 11%	6490
February	1st to 10th	Night	39% 5% 10% 16% 20% 11%	2400
	11th to 20th	Night	38% 5% 8% 19% 17% 12%	2339
	21st to end	Night	36% 4 10% 21% 18% 11%	1896
March	1st to 10th	Night	44% 5% 9% 16% 16% 11%	4918
	11th to 20th	Night	25% 5% 12% 21% 18% 19%	4980
	21st to end	Night	34% 5% 11% 19% 18% 13%	5467
April	1st to 10th	Night	30% 8% 14% 22% 16% 11%	2200
	11th to 20th	Night	31% 6% 9% 24% 21% 9%	2101
	21st to end	Night	24% 7% 16% 27% 20% 5%	1985
May	1st to 10th	Night	27% 11% 20% 27% 12% 3	4060
	11th to 20th	Night	34% 8% 19% 27% 12% 1	4033
	21st to end	Night	26% 8% 20% 28% 17% 1	4429
June	1st to 10th	Night	36% 11% 24% 20% 8%	1800
	11th to 20th	Night	37% 14% 22% 23% 5%	1800
	21st to end	Night	35% 15% 25% 19% 5% 1	1800
July	1st to 10th	Night	42% 14% 28% 14% 1	2885
	11th to 20th	Night	37% 19% 33% 9% 2	2876
	21st to end	Night	40% 16% 31% 13% 1	2988
August	1st to 10th	Night	45% 13% 32% 9% 2	2814
	11th to 20th	Night	32% 13% 26% 20% 9%	2812
	21st to end	Night	38% 12% 26% 21% 3	3804
September	1st to 10th	Night	46% 14% 20% 14% 5% 1	2090
	11th to 20th	Night	49% 13% 18% 14% 6%	2090
	21st to end	Night	39% 9% 15% 20% 14% 2	2090
October	1st to 10th	Night	52% 7% 10% 12% 13% 6%	3544
	11th to 20th	Night	30% 4 8% 17% 33% 8%	3779
	21st to end	Night	24% 4 9% 22% 33% 9%	4120
November	1st to 10th	Night	34% 6% 12% 20% 17% 10%	2341
	11th to 20th	Night	38% 5% 9% 18% 20% 10%	2400
	21st to end	Night	36% 6% 11% 20% 19% 9%	2585
December	1st to 10th	Night	31% 4 11% 23% 17% 14%	4250
	11th to 20th	Night	42% 5% 10% 20% 14% 9%	4824
	21st to end	Night	44% 6% 11% 18% 17% 5%	6490

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% 11% 42% 25% 6% 2	300
	11th to 20th	Day	11% 11% 37% 25% 12% 4	300
	21st to end	Day	17% 13% 43% 22% 5%	330
February	1st to 10th	Day	12% 12% 30% 31% 13% 2	300
	11th to 20th	Day	15% 10% 40% 23% 9% 3	300
	21st to end	Day	12% 12% 35% 29% 10% 2	330
March	1st to 10th	Day	12% 10% 33% 30% 13% 1	500
	11th to 20th	Day	14% 7% 30% 29% 16% 3	500
	21st to end	Day	12% 10% 29% 30% 17% 2	550
April	1st to 10th	Day	12% 10% 32% 25% 18% 3	500
	11th to 20th	Day	9% 8% 31% 27% 17% 8%	492
	21st to end	Day	6% 5% 24% 31% 20% 14%	500
May	1st to 10th	Day	6% 5% 24% 30% 22% 13%	503
	11th to 20th	Day	10% 3 18% 30% 25% 14%	527
	21st to end	Day	8% 2 13% 25% 30% 22%	573
June	1st to 10th	Day	13% 3 8% 29% 29% 18%	530
	11th to 20th	Day	7% 1 12% 22% 28% 30%	530
	21st to end	Day	6% 1 7% 21% 33% 32%	530
July	1st to 10th	Day	7% 2 3 17% 29% 41%	525
	11th to 20th	Day	5% 2 1 15% 35% 42%	524
	21st to end	Day	7% 3 2 19% 38% 31%	532
August	1st to 10th	Day	10% 3 6% 17% 33% 31%	486
	11th to 20th	Day	6% 2 3 16% 32% 41%	479
	21st to end	Day	10% 4 3 22% 29% 33%	539
September	1st to 10th	Day	12% 4 6% 15% 31% 32%	490
	11th to 20th	Day	16% 3 7% 24% 30% 21%	490
	21st to end	Day	14% 3 7% 22% 31% 23%	490
October	1st to 10th	Day	16% 5% 18% 29% 24% 8%	490
	11th to 20th	Day	8% 7% 18% 29% 28% 10%	490
	21st to end	Day	9% 4 20% 36% 24% 7%	539
November	1st to 10th	Day	16% 5% 19% 31% 21% 7%	495
	11th to 20th	Day	16% 7% 27% 29% 18% 4	500
	21st to end	Day	12% 9% 31% 32% 13% 3	310
December	1st to 10th	Day	10% 9% 34% 25% 17% 5%	300
	11th to 20th	Day	17% 10% 29% 32% 11% 1	300
	21st to end	Day	16% 8% 32% 27% 14% 3	330
January	1st to 10th	Night	15% 12% 32% 31% 10% 1	800
	11th to 20th	Night	14% 11% 26% 37% 11% 1	800
	21st to end	Night	17% 11% 34% 31% 7%	880
February	1st to 10th	Night	16% 7% 27% 38% 11% 1	800
	11th to 20th	Night	15% 11% 31% 35% 8% 1	783
	21st to end	Night	14% 9% 32% 36% 7%	660
March	1st to 10th	Night	13% 10% 29% 39% 10%	800
	11th to 20th	Night	11% 10% 31% 36% 11% 1	800
	21st to end	Night	10% 8% 30% 39% 13% 1	880
April	1st to 10th	Night	11% 8% 31% 38% 12% 1	800
	11th to 20th	Night	11% 7% 29% 33% 18% 1	791
	21st to end	Night	7% 4 26% 42% 21% 1	785
May	1st to 10th	Night	7% 2 20% 43% 26% 3	600
	11th to 20th	Night	7% 2 16% 38% 32% 5%	591
	21st to end	Night	7% 2 8% 35% 40% 8%	650
June	1st to 10th	Night	12% 2 8% 33% 38% 7%	600
	11th to 20th	Night	8% 2 7% 27% 41% 16%	600
	21st to end	Night	8% 2 4 27% 43% 16%	600
July	1st to 10th	Night	8% 1 5% 21% 45% 20%	585
	11th to 20th	Night	5% 2 2 15% 54% 22%	582
	21st to end	Night	6% 2 1 20% 54% 16%	624
August	1st to 10th	Night	8% 1 3 19% 52% 17%	567
	11th to 20th	Night	5% 1 2 19% 52% 21%	564
	21st to end	Night	13% 2 5% 21% 40% 19%	830
September	1st to 10th	Night	12% 3 4 22% 43% 15%	760
	11th to 20th	Night	14% 2 5% 29% 37% 12%	760
	21st to end	Night	13% 2 9% 27% 39% 11%	760
October	1st to 10th	Night	15% 2 14% 31% 32% 5%	760
	11th to 20th	Night	8% 5% 16% 37% 30% 5%	760
	21st to end	Night	10% 4 17% 37% 29% 3	836
November	1st to 10th	Night	13% 6% 22% 32% 26% 2	780
	11th to 20th	Night	13% 7% 25% 34% 20% 2	800
	21st to end	Night	15% 7% 27% 32% 20% 1	800
December	1st to 10th	Night	15% 7% 25% 32% 20% 2	800
	11th to 20th	Night	15% 9% 23% 35% 17% 2	800
	21st to end	Night	16% 8% 25% 35% 15%	880

Page generated at 2025-07-18 01:10:01. Version ac07

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