Pensacola
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pensacola clear sky chart from 2005-11-06 to 2025-08-05.

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% 2 6% 4 4 5% 4 7% 10% 44%	125069
	Night	10% 6% 2 6% 4 4 4 4 6% 9% 46%	123014
Transparency	Day	33% 9% 16% 20% 16% 7%	128961
	Night	33% 8% 15% 19% 18% 8%	127195
Seeing	Day	11% 3 13% 26% 31% 16%	15519
	Night	11% 4 17% 27% 29% 12%	25424

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% 4 2 4 4 4 4 3 5% 5% 52%	4258
	11th to 20th	Day	13% 7% 2 5% 4 3 4 3 5% 7% 47%	4520
	21st to end	Day	21% 9% 2 6% 4 4 4 4 5% 7% 36%	4972
February	1st to 10th	Day	15% 9% 4 6% 5% 4 3 3 5% 6% 42%	2000
	11th to 20th	Day	15% 6% 2 6% 4 4 4 4 6% 7% 43%	1948
	21st to end	Day	13% 7% 2 8% 4 4 5% 3 6% 7% 41%	1650
March	1st to 10th	Day	16% 9% 3 7% 4 3 4 3 5% 7% 40%	4480
	11th to 20th	Day	9% 6% 2 6% 3 4 4 3 5% 7% 52%	4738
	21st to end	Day	18% 5% 2 6% 4 4 4 4 5% 6% 43%	5819
April	1st to 10th	Day	11% 7% 2 5% 4 4 4 3 6% 7% 46%	2400
	11th to 20th	Day	10% 5% 2 5% 4 4 4 3 6% 8% 48%	2374
	21st to end	Day	6% 3 2 4 3 4 4 4 6% 8% 56%	2400
May	1st to 10th	Day	10% 6% 2 7% 4 5% 5% 4 7% 10% 40%	5405
	11th to 20th	Day	9% 4 2 5% 4 4 4 4 7% 10% 47%	5833
	21st to end	Day	4 3 1 5% 4 5% 5% 4 7% 13% 49%	6433
June	1st to 10th	Day	7% 6% 3 7% 6% 5% 5% 6% 9% 12% 35%	2600
	11th to 20th	Day	5% 4 2 5% 5% 6% 6% 6% 10% 14% 38%	2600
	21st to end	Day	6% 5% 2 7% 5% 6% 7% 6% 10% 13% 34%	2600
July	1st to 10th	Day	5% 5% 2 7% 6% 6% 6% 6% 10% 15% 32%	5900
	11th to 20th	Day	3 3 2 6% 6% 7% 6% 6% 9% 14% 38%	5629
	21st to end	Day	3 3 2 7% 6% 7% 8% 8% 11% 16% 29%	5922
August	1st to 10th	Day	4 3 1 4 4 5% 5% 5% 10% 15% 43%	3833
	11th to 20th	Day	4 3 2 5% 4 4 6% 5% 9% 12% 44%	3729
	21st to end	Day	6% 4 2 7% 5% 5% 7% 6% 9% 12% 37%	4180
September	1st to 10th	Day	10% 5% 2 6% 5% 5% 5% 5% 8% 12% 37%	2234
	11th to 20th	Day	10% 7% 3 6% 4 4 5% 4 8% 9% 38%	2090
	21st to end	Day	7% 4 1 5% 4 5% 5% 4 6% 7% 51%	2090
October	1st to 10th	Day	8% 4 1 4 3 4 3 3 6% 8% 55%	2090
	11th to 20th	Day	7% 3 1 4 3 3 3 3 5% 7% 60%	2090
	21st to end	Day	9% 4 2 5% 4 4 3 3 4 6% 56%	2121
November	1st to 10th	Day	8% 5% 2 4 4 3 3 4 4 6% 57%	1762
	11th to 20th	Day	10% 5% 2 4 4 4 4 3 5% 7% 54%	1800
	21st to end	Day	9% 5% 2 5% 4 5% 5% 4 6% 7% 49%	1800
December	1st to 10th	Day	12% 6% 2 6% 4 4 3 3 5% 7% 48%	2930
	11th to 20th	Day	12% 8% 3 6% 4 3 4 2 4 5% 49%	3373
	21st to end	Day	16% 8% 3 6% 4 3 3 3 4 6% 45%	4466
January	1st to 10th	Night	13% 6% 2 5% 4 5% 4 3 4 5% 49%	5682
	11th to 20th	Night	17% 7% 3 6% 4 3 4 2 4 7% 42%	5440
	21st to end	Night	17% 8% 2 5% 4 4 4 3 6% 9% 38%	5984
February	1st to 10th	Night	13% 9% 2 6% 4 4 4 3 4 6% 46%	2400
	11th to 20th	Night	17% 8% 2 6% 3 3 4 3 5% 6% 44%	2338
	21st to end	Night	14% 7% 2 6% 5% 4 4 4 5% 6% 42%	1980
March	1st to 10th	Night	20% 10% 3 6% 3 3 3 3 5% 6% 37%	5373
	11th to 20th	Night	10% 6% 2 5% 4 4 4 3 6% 7% 50%	5220
	21st to end	Night	13% 6% 2 5% 4 4 4 3 4 7% 48%	5149
April	1st to 10th	Night	12% 7% 2 5% 4 4 4 4 5% 8% 45%	2000
	11th to 20th	Night	12% 4 2 6% 3 4 3 3 6% 8% 49%	1975
	21st to end	Night	5% 5% 1 3 3 3 4 4 5% 7% 60%	2000
May	1st to 10th	Night	10% 6% 2 7% 5% 5% 5% 5% 7% 10% 39%	4490
	11th to 20th	Night	8% 5% 2 6% 4 4 4 4 6% 9% 48%	4042
	21st to end	Night	3 3 2 6% 5% 4 5% 4 7% 12% 49%	4421
June	1st to 10th	Night	7% 6% 2 6% 4 4 5% 4 8% 13% 41%	1800
	11th to 20th	Night	3 3 2 5% 4 4 5% 6% 9% 13% 47%	1800
	21st to end	Night	4 4 2 5% 5% 5% 6% 6% 10% 15% 38%	1800
July	1st to 10th	Night	3 3 1 5% 6% 5% 7% 7% 11% 16% 35%	4058
	11th to 20th	Night	2 2 1 4 4 4 5% 5% 10% 16% 47%	4322
	21st to end	Night	2 2 2 5% 5% 6% 7% 7% 11% 17% 35%	4929
August	1st to 10th	Night	2 2 1 5% 4 5% 5% 5% 8% 15% 48%	3184
	11th to 20th	Night	4 3 1 5% 4 4 4 5% 8% 12% 51%	3100
	21st to end	Night	4 4 2 7% 6% 6% 6% 6% 9% 13% 37%	3476
September	1st to 10th	Night	9% 5% 3 6% 5% 5% 5% 5% 9% 12% 35%	1924
	11th to 20th	Night	9% 6% 3 7% 5% 5% 4 4 7% 8% 41%	2090
	21st to end	Night	7% 4 2 6% 3 3 4 4 6% 8% 51%	2090
October	1st to 10th	Night	6% 5% 2 6% 4 4 3 3 6% 8% 53%	2090
	11th to 20th	Night	6% 4 1 3 3 3 3 4 4 7% 62%	2090
	21st to end	Night	9% 5% 2 5% 3 4 5% 3 4 6% 55%	2469
November	1st to 10th	Night	9% 6% 2 5% 3 3 4 3 5% 7% 56%	2536
	11th to 20th	Night	11% 6% 2 5% 4 4 3 3 4 6% 53%	2600
	21st to end	Night	10% 5% 2 5% 4 4 3 4 5% 7% 50%	2600
December	1st to 10th	Night	11% 5% 2 6% 4 3 4 3 6% 7% 49%	4250
	11th to 20th	Night	12% 6% 2 5% 3 3 4 3 5% 6% 51%	4822
	21st to end	Night	17% 8% 2 6% 4 3 3 3 4 5% 46%	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	32% 5% 7% 19% 28% 9%	4259
	11th to 20th	Day	37% 5% 7% 16% 27% 8%	4520
	21st to end	Day	47% 5% 8% 14% 16% 10%	4972
February	1st to 10th	Day	43% 5% 9% 15% 19% 10%	2000
	11th to 20th	Day	38% 6% 10% 17% 20% 9%	1958
	21st to end	Day	39% 9% 11% 17% 16% 9%	1650
March	1st to 10th	Day	43% 5% 8% 19% 16% 8%	4480
	11th to 20th	Day	29% 7% 12% 15% 24% 14%	4738
	21st to end	Day	41% 6% 11% 19% 15% 8%	5821
April	1st to 10th	Day	35% 6% 13% 18% 19% 8%	2400
	11th to 20th	Day	32% 6% 11% 22% 20% 9%	2374
	21st to end	Day	25% 7% 14% 25% 22% 8%	2400
May	1st to 10th	Day	35% 11% 16% 23% 12% 3	5440
	11th to 20th	Day	29% 9% 21% 28% 13% 1	5837
	21st to end	Day	23% 10% 20% 31% 14% 2	6447
June	1st to 10th	Day	34% 11% 19% 27% 9% 1	2600
	11th to 20th	Day	30% 12% 22% 25% 10% 1	2600
	21st to end	Day	35% 12% 24% 19% 9% 1	2600
July	1st to 10th	Day	34% 16% 34% 14% 2	5835
	11th to 20th	Day	31% 17% 37% 13% 1	5561
	21st to end	Day	32% 20% 30% 17% 2	5752
August	1st to 10th	Day	23% 12% 23% 28% 12% 2	3821
	11th to 20th	Day	26% 12% 24% 25% 13% 1	3765
	21st to end	Day	35% 13% 26% 15% 10% 2	4179
September	1st to 10th	Day	36% 13% 21% 17% 10% 4	2234
	11th to 20th	Day	37% 11% 15% 17% 14% 6%	2090
	21st to end	Day	29% 9% 12% 22% 21% 7%	2090
October	1st to 10th	Day	30% 4 8% 13% 17% 27%	3480
	11th to 20th	Day	15% 4 6% 21% 23% 31%	3458
	21st to end	Day	21% 4 6% 14% 38% 17%	3472
November	1st to 10th	Day	28% 4 10% 21% 23% 12%	1762
	11th to 20th	Day	30% 5% 8% 18% 27% 12%	1800
	21st to end	Day	33% 7% 9% 21% 21% 10%	1800
December	1st to 10th	Day	35% 6% 11% 18% 23% 7%	2930
	11th to 20th	Day	38% 5% 7% 20% 21% 9%	3370
	21st to end	Day	41% 4 9% 15% 28% 3	4466
January	1st to 10th	Night	36% 5% 6% 15% 28% 10%	5682
	11th to 20th	Night	43% 4 5% 14% 29% 5%	5440
	21st to end	Night	43% 5% 10% 16% 18% 8%	5984
February	1st to 10th	Night	39% 5% 7% 16% 22% 10%	2400
	11th to 20th	Night	40% 5% 8% 15% 20% 12%	2339
	21st to end	Night	41% 6% 10% 17% 15% 12%	1980
March	1st to 10th	Night	46% 5% 8% 16% 17% 7%	5373
	11th to 20th	Night	31% 6% 11% 16% 20% 16%	5220
	21st to end	Night	35% 5% 12% 21% 16% 11%	5149
April	1st to 10th	Night	36% 6% 13% 14% 19% 11%	2000
	11th to 20th	Night	33% 5% 10% 21% 22% 10%	1975
	21st to end	Night	23% 6% 11% 29% 24% 7%	2000
May	1st to 10th	Night	36% 9% 21% 19% 13% 3	4520
	11th to 20th	Night	30% 8% 19% 27% 15% 1	4043
	21st to end	Night	24% 8% 19% 34% 13% 1	4429
June	1st to 10th	Night	32% 10% 23% 24% 9% 2	1800
	11th to 20th	Night	25% 13% 24% 25% 12% 1	1800
	21st to end	Night	29% 14% 27% 20% 9% 1	1800
July	1st to 10th	Night	31% 16% 36% 15% 2	4015
	11th to 20th	Night	21% 17% 47% 13% 2	4270
	21st to end	Night	29% 21% 28% 20% 2	4785
August	1st to 10th	Night	22% 12% 27% 25% 13% 1	3172
	11th to 20th	Night	23% 11% 27% 31% 8%	3130
	21st to end	Night	32% 16% 24% 16% 9% 2	3476
September	1st to 10th	Night	37% 10% 24% 14% 11% 3	1924
	11th to 20th	Night	39% 10% 15% 17% 14% 5%	2090
	21st to end	Night	28% 8% 14% 24% 18% 8%	2090
October	1st to 10th	Night	35% 5% 7% 14% 17% 22%	3480
	11th to 20th	Night	14% 3 5% 20% 29% 29%	3461
	21st to end	Night	21% 4 5% 11% 43% 15%	4068
November	1st to 10th	Night	29% 4 9% 19% 25% 14%	2536
	11th to 20th	Night	34% 4 5% 19% 27% 12%	2600
	21st to end	Night	33% 6% 10% 19% 21% 12%	2600
December	1st to 10th	Night	35% 4 10% 19% 22% 10%	4250
	11th to 20th	Night	34% 4 9% 22% 20% 10%	4824
	21st to end	Night	42% 4 6% 17% 26% 4	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% 8% 29% 35% 14% 1	300
	11th to 20th	Day	9% 7% 28% 38% 16% 1	300
	21st to end	Day	24% 8% 29% 30% 8% 1	330
February	1st to 10th	Day	19% 7% 26% 33% 14% 1	300
	11th to 20th	Day	19% 6% 29% 34% 12%	300
	21st to end	Day	10% 7% 28% 45% 10%	249
March	1st to 10th	Day	13% 8% 32% 34% 14% 1	300
	11th to 20th	Day	13% 5% 26% 37% 18% 1	388
	21st to end	Day	15% 5% 23% 37% 18% 1	550
April	1st to 10th	Day	15% 6% 23% 36% 17% 2	500
	11th to 20th	Day	11% 5% 22% 35% 23% 4	492
	21st to end	Day	7% 4 14% 39% 31% 6%	500
May	1st to 10th	Day	8% 5% 13% 38% 30% 6%	503
	11th to 20th	Day	7% 1 9% 33% 39% 11%	527
	21st to end	Day	6% 2 5% 26% 43% 17%	573
June	1st to 10th	Day	9% 2 5% 20% 44% 20%	530
	11th to 20th	Day	8% 1 5% 17% 43% 25%	530
	21st to end	Day	8% 1 4 16% 40% 31%	530
July	1st to 10th	Day	8% 2 3 9% 37% 41%	525
	11th to 20th	Day	6% 6% 6% 35% 48%	524
	21st to end	Day	5% 1 3 10% 42% 38%	576
August	1st to 10th	Day	7% 2 8% 37% 46%	502
	11th to 20th	Day	9% 1 3 8% 35% 44%	479
	21st to end	Day	8% 1 5% 14% 41% 31%	539
September	1st to 10th	Day	13% 2 4 12% 35% 34%	490
	11th to 20th	Day	14% 2 5% 18% 41% 20%	490
	21st to end	Day	9% 1 7% 22% 43% 18%	490
October	1st to 10th	Day	10% 1 12% 31% 38% 7%	490
	11th to 20th	Day	6% 2 12% 31% 38% 13%	490
	21st to end	Day	13% 4 14% 29% 32% 9%	392
November	1st to 10th	Day	13% 2 11% 29% 39% 6%	300
	11th to 20th	Day	13% 4 18% 33% 28% 4	300
	21st to end	Day	11% 3 19% 39% 24% 5%	300
December	1st to 10th	Day	13% 4 27% 33% 20% 3	300
	11th to 20th	Day	20% 5% 23% 34% 17% 2	300
	21st to end	Day	21% 6% 19% 35% 18% 2	330
January	1st to 10th	Night	17% 10% 33% 28% 11% 2	800
	11th to 20th	Night	14% 10% 27% 31% 16% 2	800
	21st to end	Night	19% 9% 32% 32% 9%	880
February	1st to 10th	Night	16% 8% 25% 35% 14% 1	800
	11th to 20th	Night	19% 8% 28% 29% 15% 1	783
	21st to end	Night	16% 5% 29% 37% 13%	660
March	1st to 10th	Night	14% 6% 28% 36% 16% 1	800
	11th to 20th	Night	12% 5% 26% 34% 20% 4	800
	21st to end	Night	11% 5% 23% 35% 24% 2	743
April	1st to 10th	Night	14% 6% 21% 36% 21% 2	600
	11th to 20th	Night	13% 3 22% 32% 28% 3	593
	21st to end	Night	5% 3 16% 35% 35% 6%	600
May	1st to 10th	Night	8% 3 13% 34% 34% 7%	600
	11th to 20th	Night	6% 2 12% 30% 38% 12%	591
	21st to end	Night	6% 1 7% 22% 48% 17%	650
June	1st to 10th	Night	9% 1 6% 20% 47% 18%	600
	11th to 20th	Night	4 1 4 17% 48% 26%	600
	21st to end	Night	6% 1 4 13% 50% 27%	600
July	1st to 10th	Night	5% 1 3 9% 43% 38%	585
	11th to 20th	Night	3 1 2 6% 38% 50%	582
	21st to end	Night	3 1 2 8% 46% 39%	657
August	1st to 10th	Night	4 1 8% 40% 47%	579
	11th to 20th	Night	8% 1 3 5% 43% 40%	564
	21st to end	Night	8% 2 7% 12% 42% 29%	627
September	1st to 10th	Night	10% 2 5% 13% 39% 30%	594
	11th to 20th	Night	12% 2 9% 19% 43% 15%	760
	21st to end	Night	9% 1 8% 23% 44% 14%	760
October	1st to 10th	Night	9% 2 13% 33% 37% 7%	760
	11th to 20th	Night	8% 4 14% 30% 33% 11%	760
	21st to end	Night	10% 4 18% 32% 31% 5%	836
November	1st to 10th	Night	11% 5% 18% 35% 26% 5%	780
	11th to 20th	Night	12% 8% 20% 35% 22% 3	800
	21st to end	Night	13% 4 26% 32% 22% 3	800
December	1st to 10th	Night	13% 7% 24% 32% 20% 4	800
	11th to 20th	Night	16% 7% 26% 30% 19% 2	800
	21st to end	Night	22% 8% 23% 32% 15% 1	880

Page generated at 2025-08-02 00:32:25. Version ac07

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