Dothan
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Dothan 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	10% 6% 3 5% 6% 3 5% 5% 6% 8% 42%	78836
	Night	10% 6% 2 5% 5% 3 5% 5% 6% 8% 45%	80249
Transparency	Day	38% 7% 12% 18% 19% 7%	78561
	Night	36% 6% 11% 17% 20% 9%	80043
Seeing	Day	12% 5% 17% 24% 24% 18%	13799
	Night	13% 4 20% 32% 25% 6%	23879

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	14% 5% 2 5% 5% 2 4 5% 6% 6% 44%	2836
	11th to 20th	Day	11% 6% 2 4 3 2 2 4 4 8% 53%	2946
	21st to end	Day	19% 7% 2 5% 5% 3 4 4 4 6% 40%	3476
February	1st to 10th	Day	15% 7% 3 6% 6% 2 4 4 5% 6% 41%	1900
	11th to 20th	Day	16% 6% 3 5% 3 3 4 4 5% 7% 45%	1788
	21st to end	Day	16% 7% 3 4 5% 3 5% 5% 5% 8% 40%	1480
March	1st to 10th	Day	9% 6% 3 5% 4 3 5% 4 6% 7% 49%	1804
	11th to 20th	Day	12% 6% 2 5% 6% 3 4 4 6% 8% 43%	1980
	21st to end	Day	10% 6% 2 4 5% 3 5% 5% 6% 7% 47%	2178
April	1st to 10th	Day	12% 4 3 5% 5% 3 4 5% 5% 6% 46%	2096
	11th to 20th	Day	11% 6% 3 5% 5% 3 4 5% 4 7% 47%	2134
	21st to end	Day	6% 4 2 4 6% 3 5% 5% 5% 6% 55%	2160
May	1st to 10th	Day	6% 4 2 4 4 3 5% 4 6% 9% 53%	2338
	11th to 20th	Day	6% 5% 3 6% 7% 3 5% 6% 8% 9% 42%	2301
	21st to end	Day	7% 5% 2 5% 5% 3 5% 6% 7% 9% 45%	2531
June	1st to 10th	Day	10% 6% 3 6% 6% 4 6% 8% 8% 10% 33%	2340
	11th to 20th	Day	5% 4 2 5% 7% 4 7% 7% 9% 12% 38%	2340
	21st to end	Day	5% 4 3 7% 8% 5% 9% 9% 9% 11% 31%	2340
July	1st to 10th	Day	7% 6% 4 6% 8% 5% 8% 9% 9% 12% 26%	2340
	11th to 20th	Day	9% 7% 3 7% 7% 5% 7% 7% 8% 12% 30%	2340
	21st to end	Day	5% 5% 3 5% 7% 5% 9% 7% 10% 13% 31%	2518
August	1st to 10th	Day	8% 6% 3 6% 8% 5% 7% 8% 10% 10% 28%	2148
	11th to 20th	Day	10% 7% 4 7% 8% 5% 6% 7% 7% 11% 28%	2125
	21st to end	Day	10% 7% 4 8% 9% 6% 8% 7% 7% 9% 27%	2376
September	1st to 10th	Day	7% 7% 3 7% 6% 5% 8% 8% 7% 10% 32%	2018
	11th to 20th	Day	10% 6% 3 6% 7% 4 6% 6% 6% 9% 37%	1980
	21st to end	Day	10% 5% 3 5% 6% 3 4 6% 6% 7% 46%	1980
October	1st to 10th	Day	8% 5% 2 5% 5% 4 4 4 6% 8% 50%	1980
	11th to 20th	Day	10% 3 2 4 3 2 4 3 4 7% 58%	1980
	21st to end	Day	9% 4 2 4 4 3 3 4 5% 6% 56%	1994
November	1st to 10th	Day	9% 4 2 3 4 2 3 4 5% 6% 58%	1682
	11th to 20th	Day	10% 5% 2 3 4 3 4 4 4 5% 56%	1710
	21st to end	Day	12% 6% 3 5% 4 3 3 5% 5% 7% 48%	1710
December	1st to 10th	Day	13% 5% 2 5% 5% 3 5% 4 4 7% 47%	1710
	11th to 20th	Day	17% 8% 3 5% 5% 2 4 4 5% 6% 41%	2153
	21st to end	Day	17% 8% 3 7% 4 3 4 3 4 5% 43%	3124
January	1st to 10th	Night	15% 6% 2 5% 5% 3 5% 5% 5% 6% 44%	4109
	11th to 20th	Night	8% 6% 2 6% 5% 3 4 5% 5% 7% 48%	4010
	21st to end	Night	20% 9% 3 5% 4 2 4 4 5% 6% 38%	4180
February	1st to 10th	Night	14% 6% 3 5% 5% 3 4 4 5% 6% 45%	2280
	11th to 20th	Night	16% 7% 3 4 4 2 4 4 4 5% 48%	2153
	21st to end	Night	14% 6% 2 5% 6% 3 4 4 5% 5% 45%	1776
March	1st to 10th	Night	11% 6% 2 4 5% 2 3 4 5% 7% 50%	2155
	11th to 20th	Night	12% 5% 2 5% 5% 3 5% 5% 5% 7% 46%	1980
	21st to end	Night	8% 4 2 5% 5% 3 4 4 4 8% 52%	2178
April	1st to 10th	Night	10% 5% 3 5% 4 3 4 5% 5% 8% 49%	1877
	11th to 20th	Night	11% 5% 2 6% 4 3 4 4 6% 7% 47%	1775
	21st to end	Night	7% 3 1 4 4 3 4 4 6% 8% 56%	1800
May	1st to 10th	Night	5% 4 2 4 4 2 4 5% 6% 10% 55%	1620
	11th to 20th	Night	6% 4 2 5% 5% 3 6% 6% 6% 9% 47%	1592
	21st to end	Night	6% 5% 2 6% 6% 3 5% 6% 6% 10% 45%	1744
June	1st to 10th	Night	7% 5% 3 6% 5% 5% 6% 7% 8% 12% 35%	1620
	11th to 20th	Night	3 3 3 4 5% 4 8% 8% 7% 12% 44%	1620
	21st to end	Night	5% 5% 2 8% 7% 4 6% 7% 8% 11% 36%	1620
July	1st to 10th	Night	6% 4 2 7% 5% 4 7% 9% 9% 14% 32%	1620
	11th to 20th	Night	6% 5% 2 5% 5% 4 7% 7% 10% 13% 35%	1620
	21st to end	Night	3 2 2 6% 6% 4 7% 7% 10% 12% 41%	1795
August	1st to 10th	Night	6% 4 2 4 7% 4 7% 8% 10% 16% 32%	1790
	11th to 20th	Night	7% 5% 2 6% 6% 5% 7% 7% 9% 11% 35%	1776
	21st to end	Night	9% 7% 3 7% 7% 5% 6% 8% 8% 9% 31%	1980
September	1st to 10th	Night	8% 6% 3 7% 8% 5% 7% 8% 8% 10% 32%	1921
	11th to 20th	Night	10% 7% 3 6% 6% 4 5% 6% 6% 9% 39%	1980
	21st to end	Night	8% 5% 2 5% 6% 4 5% 5% 5% 7% 47%	1980
October	1st to 10th	Night	6% 6% 3 4 4 2 4 4 6% 8% 53%	1980
	11th to 20th	Night	9% 4 1 3 3 1 3 4 4 8% 59%	1980
	21st to end	Night	10% 5% 2 4 4 3 4 4 5% 5% 55%	2361
November	1st to 10th	Night	8% 4 2 4 3 2 4 5% 5% 5% 58%	2393
	11th to 20th	Night	11% 5% 2 3 3 2 4 3 4 6% 56%	2470
	21st to end	Night	13% 5% 2 5% 4 2 4 4 6% 6% 48%	2470
December	1st to 10th	Night	13% 6% 2 4 4 2 4 4 5% 7% 48%	2470
	11th to 20th	Night	15% 6% 3 5% 4 3 4 4 4 6% 47%	3042
	21st to end	Night	17% 9% 3 6% 5% 3 4 4 5% 6% 39%	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	39% 4 6% 17% 24% 10%	2837
	11th to 20th	Day	30% 3 6% 16% 32% 13%	2946
	21st to end	Day	45% 4 6% 14% 19% 12%	3476
February	1st to 10th	Day	44% 3 8% 16% 20% 10%	1900
	11th to 20th	Day	39% 4 6% 15% 25% 11%	1798
	21st to end	Day	42% 5% 9% 18% 16% 11%	1480
March	1st to 10th	Day	34% 4 8% 18% 23% 12%	1804
	11th to 20th	Day	39% 4 13% 16% 19% 10%	1980
	21st to end	Day	35% 5% 10% 22% 22% 7%	2178
April	1st to 10th	Day	38% 5% 9% 19% 17% 12%	2096
	11th to 20th	Day	37% 4 7% 19% 22% 11%	2134
	21st to end	Day	29% 5% 8% 23% 26% 8%	2160
May	1st to 10th	Day	28% 5% 11% 23% 26% 8%	2338
	11th to 20th	Day	37% 8% 13% 20% 19% 3	2305
	21st to end	Day	34% 8% 13% 23% 19% 3	2531
June	1st to 10th	Day	41% 11% 14% 24% 9% 1	2340
	11th to 20th	Day	34% 9% 19% 23% 13% 1	2340
	21st to end	Day	42% 11% 20% 16% 10% 1	2340
July	1st to 10th	Day	43% 15% 23% 15% 4 1	2275
	11th to 20th	Day	43% 13% 24% 13% 6% 1	2271
	21st to end	Day	37% 11% 24% 20% 7%	2377
August	1st to 10th	Day	43% 11% 23% 19% 4	2136
	11th to 20th	Day	48% 10% 20% 15% 6% 1	2125
	21st to end	Day	51% 10% 15% 14% 8% 2	2376
September	1st to 10th	Day	43% 12% 15% 14% 13% 4	2018
	11th to 20th	Day	41% 9% 12% 18% 14% 6%	1980
	21st to end	Day	36% 7% 11% 17% 23% 7%	1980
October	1st to 10th	Day	32% 5% 11% 19% 21% 12%	1980
	11th to 20th	Day	27% 4 7% 20% 30% 12%	1980
	21st to end	Day	29% 4 6% 13% 30% 18%	1994
November	1st to 10th	Day	28% 3 7% 20% 25% 16%	1682
	11th to 20th	Day	30% 3 6% 18% 28% 14%	1710
	21st to end	Day	36% 4 7% 18% 22% 12%	1710
December	1st to 10th	Day	37% 4 13% 15% 21% 9%	1710
	11th to 20th	Day	44% 4 6% 16% 23% 8%	2150
	21st to end	Day	45% 3 5% 18% 23% 6%	3124
January	1st to 10th	Night	40% 4 7% 11% 23% 16%	4109
	11th to 20th	Night	34% 4 6% 15% 27% 12%	4010
	21st to end	Night	46% 4 6% 14% 23% 7%	4180
February	1st to 10th	Night	40% 4 7% 15% 22% 12%	2280
	11th to 20th	Night	40% 4 7% 13% 21% 15%	2154
	21st to end	Night	41% 4 6% 18% 16% 15%	1776
March	1st to 10th	Night	35% 4 7% 17% 24% 14%	2155
	11th to 20th	Night	38% 4 11% 19% 18% 11%	1980
	21st to end	Night	33% 5% 10% 19% 23% 10%	2178
April	1st to 10th	Night	33% 5% 11% 16% 21% 14%	1877
	11th to 20th	Night	36% 4 7% 18% 24% 10%	1775
	21st to end	Night	27% 4 10% 27% 23% 10%	1800
May	1st to 10th	Night	25% 6% 11% 20% 28% 10%	1620
	11th to 20th	Night	32% 9% 17% 17% 19% 6%	1593
	21st to end	Night	32% 8% 17% 18% 19% 6%	1745
June	1st to 10th	Night	38% 10% 19% 20% 11% 1	1620
	11th to 20th	Night	29% 13% 20% 25% 11% 3	1620
	21st to end	Night	38% 11% 23% 15% 11% 2	1620
July	1st to 10th	Night	36% 15% 28% 16% 4 1	1575
	11th to 20th	Night	34% 14% 30% 16% 6%	1566
	21st to end	Night	29% 14% 29% 22% 7% 1	1695
August	1st to 10th	Night	35% 14% 28% 20% 2 1	1778
	11th to 20th	Night	38% 13% 24% 18% 5% 1	1776
	21st to end	Night	43% 12% 18% 15% 9% 3	1980
September	1st to 10th	Night	42% 12% 17% 14% 11% 4	1921
	11th to 20th	Night	40% 9% 12% 16% 18% 5%	1980
	21st to end	Night	34% 7% 13% 15% 21% 9%	1980
October	1st to 10th	Night	29% 6% 10% 18% 23% 14%	1980
	11th to 20th	Night	25% 4 8% 21% 30% 12%	1980
	21st to end	Night	32% 3 5% 14% 27% 19%	2361
November	1st to 10th	Night	28% 4 6% 18% 25% 19%	2393
	11th to 20th	Night	30% 3 7% 14% 30% 16%	2470
	21st to end	Night	36% 4 7% 18% 22% 13%	2470
December	1st to 10th	Night	36% 4 10% 18% 23% 8%	2470
	11th to 20th	Night	39% 4 6% 14% 27% 11%	3044
	21st to end	Night	46% 4 6% 17% 23% 5%	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% 12% 40% 24% 7% 1	270
	11th to 20th	Day	11% 14% 30% 32% 11% 3	270
	21st to end	Day	19% 13% 40% 21% 6% 1	297
February	1st to 10th	Day	20% 11% 38% 21% 9%	270
	11th to 20th	Day	23% 12% 31% 27% 8%	252
	21st to end	Day	14% 13% 39% 29% 5%	198
March	1st to 10th	Day	13% 14% 34% 29% 9% 1	244
	11th to 20th	Day	15% 8% 33% 30% 12% 3	420
	21st to end	Day	13% 8% 32% 31% 16% 2	462
April	1st to 10th	Day	15% 10% 24% 30% 18% 3	420
	11th to 20th	Day	14% 7% 27% 27% 21% 5%	412
	21st to end	Day	10% 5% 23% 31% 22% 9%	420
May	1st to 10th	Day	7% 5% 21% 28% 28% 11%	423
	11th to 20th	Day	10% 2 10% 30% 31% 18%	447
	21st to end	Day	11% 1 8% 26% 28% 26%	485
June	1st to 10th	Day	14% 2 6% 22% 28% 26%	450
	11th to 20th	Day	8% 1 8% 19% 30% 35%	450
	21st to end	Day	7% 1 4 21% 31% 35%	450
July	1st to 10th	Day	7% 2 4 9% 33% 44%	445
	11th to 20th	Day	8% 2 2 7% 26% 55%	444
	21st to end	Day	7% 1 4 11% 34% 44%	488
August	1st to 10th	Day	10% 2 14% 29% 45%	446
	11th to 20th	Day	10% 2 1 11% 35% 41%	439
	21st to end	Day	11% 3 3 21% 34% 28%	495
September	1st to 10th	Day	10% 3 4 20% 35% 27%	450
	11th to 20th	Day	14% 2 6% 24% 35% 18%	450
	21st to end	Day	12% 1 9% 24% 35% 20%	450
October	1st to 10th	Day	11% 2 18% 37% 24% 8%	450
	11th to 20th	Day	9% 3 16% 30% 30% 11%	450
	21st to end	Day	11% 6% 20% 31% 26% 5%	495
November	1st to 10th	Day	16% 4 24% 27% 20% 8%	280
	11th to 20th	Day	10% 7% 36% 30% 16% 2	270
	21st to end	Day	13% 9% 25% 34% 16% 4	270
December	1st to 10th	Day	19% 7% 29% 30% 11% 4	270
	11th to 20th	Day	25% 7% 34% 23% 10% 1	270
	21st to end	Day	21% 5% 30% 28% 12% 4	297
January	1st to 10th	Night	18% 7% 36% 30% 7% 1	760
	11th to 20th	Night	14% 10% 28% 37% 11%	760
	21st to end	Night	22% 8% 33% 32% 5%	836
February	1st to 10th	Night	17% 7% 30% 37% 8% 1	760
	11th to 20th	Night	20% 8% 32% 33% 8%	722
	21st to end	Night	16% 8% 36% 35% 4	592
March	1st to 10th	Night	14% 6% 31% 40% 9%	720
	11th to 20th	Night	14% 4 34% 33% 13% 1	720
	21st to end	Night	11% 8% 32% 37% 13%	792
April	1st to 10th	Night	13% 6% 27% 38% 16%	617
	11th to 20th	Night	15% 4 26% 34% 19% 1	533
	21st to end	Night	8% 2 24% 40% 24% 1	540
May	1st to 10th	Night	7% 3 24% 37% 27% 2	540
	11th to 20th	Night	8% 2 15% 38% 31% 7%	531
	21st to end	Night	8% 2 8% 33% 42% 7%	584
June	1st to 10th	Night	9% 2 5% 34% 42% 7%	540
	11th to 20th	Night	4 1 6% 28% 47% 13%	540
	21st to end	Night	6% 1 5% 27% 46% 15%	540
July	1st to 10th	Night	7% 1 1 21% 50% 20%	525
	11th to 20th	Night	8% 2 1 15% 48% 27%	522
	21st to end	Night	4 1 2 22% 51% 20%	591
August	1st to 10th	Night	7% 2 1 20% 49% 22%	537
	11th to 20th	Night	9% 2 1 15% 53% 19%	534
	21st to end	Night	12% 2 3 19% 46% 18%	594
September	1st to 10th	Night	11% 2 5% 23% 44% 15%	661
	11th to 20th	Night	14% 3 8% 29% 40% 7%	720
	21st to end	Night	11% 2 9% 30% 41% 7%	720
October	1st to 10th	Night	9% 2 19% 37% 29% 4	720
	11th to 20th	Night	11% 4 17% 34% 31% 4	720
	21st to end	Night	13% 3 20% 36% 27% 1	792
November	1st to 10th	Night	11% 3 22% 40% 22% 3	740
	11th to 20th	Night	14% 5% 27% 37% 16% 1	760
	21st to end	Night	16% 4 26% 36% 16% 1	760
December	1st to 10th	Night	16% 6% 26% 36% 15% 2	760
	11th to 20th	Night	19% 3 29% 34% 13% 1	760
	21st to end	Night	25% 6% 25% 32% 11%	836

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