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 2026-07-31.

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% 2 6% 5% 5% 5% 4 7% 9% 42%	138168
	Night	11% 6% 2 6% 4 4 5% 4 6% 8% 44%	134853
Transparency	Day	37% 6% 13% 18% 17% 8%	142031
	Night	37% 6% 12% 17% 19% 9%	139061
Seeing	Day	12% 6% 19% 25% 23% 16%	17103
	Night	13% 5% 21% 32% 25% 5%	27043

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% 6% 3 7% 4 4 4 3 5% 5% 46%	5258
	11th to 20th	Day	13% 5% 2 4 3 3 3 3 5% 8% 52%	5498
	21st to end	Day	15% 7% 2 7% 5% 5% 5% 4 5% 7% 39%	6436
February	1st to 10th	Day	14% 7% 3 7% 5% 3 4 3 5% 6% 43%	2100
	11th to 20th	Day	17% 6% 3 6% 3 3 4 3 6% 6% 44%	2048
	21st to end	Day	15% 7% 2 6% 4 4 4 4 5% 7% 42%	1730
March	1st to 10th	Day	16% 7% 2 6% 4 4 4 4 6% 6% 40%	4598
	11th to 20th	Day	7% 4 1 5% 4 4 3 4 6% 7% 54%	5090
	21st to end	Day	13% 6% 2 6% 5% 4 4 3 5% 7% 46%	5586
April	1st to 10th	Day	12% 5% 3 6% 5% 4 5% 4 5% 6% 46%	2446
	11th to 20th	Day	9% 5% 2 6% 4 4 4 4 5% 6% 50%	2494
	21st to end	Day	6% 4 2 6% 5% 5% 5% 4 5% 6% 52%	2520
May	1st to 10th	Day	15% 7% 3 7% 5% 5% 4 3 6% 8% 37%	7614
	11th to 20th	Day	11% 5% 2 6% 5% 4 5% 5% 7% 10% 39%	7626
	21st to end	Day	7% 6% 2 8% 6% 6% 6% 5% 8% 10% 36%	8391
June	1st to 10th	Day	10% 6% 3 7% 6% 5% 6% 6% 8% 11% 33%	2730
	11th to 20th	Day	5% 4 2 7% 6% 6% 8% 5% 9% 12% 36%	2730
	21st to end	Day	5% 5% 2 8% 6% 7% 7% 7% 8% 11% 32%	2730
July	1st to 10th	Day	6% 6% 2 8% 7% 7% 9% 7% 11% 12% 25%	6030
	11th to 20th	Day	4 4 2 7% 5% 6% 7% 6% 8% 13% 38%	6030
	21st to end	Day	5% 5% 2 8% 6% 7% 9% 6% 10% 15% 27%	6470
August	1st to 10th	Day	7% 5% 2 7% 6% 6% 7% 6% 10% 11% 33%	3905
	11th to 20th	Day	6% 5% 2 6% 5% 4 4 4 6% 10% 47%	3849
	21st to end	Day	6% 6% 3 8% 6% 7% 7% 5% 8% 11% 32%	4312
September	1st to 10th	Day	8% 7% 2 7% 6% 6% 7% 6% 8% 9% 32%	2242
	11th to 20th	Day	11% 7% 3 6% 5% 6% 5% 4 6% 8% 39%	2200
	21st to end	Day	10% 5% 3 6% 5% 4 5% 5% 6% 7% 47%	2200
October	1st to 10th	Day	9% 5% 2 6% 4 5% 4 3 6% 7% 49%	2200
	11th to 20th	Day	9% 3 2 4 3 3 3 3 4 7% 61%	2200
	21st to end	Day	9% 4 2 5% 3 4 3 3 4 6% 57%	2215
November	1st to 10th	Day	9% 5% 2 4 3 3 3 3 5% 6% 57%	1862
	11th to 20th	Day	10% 6% 2 4 3 3 4 3 4 5% 57%	1890
	21st to end	Day	11% 6% 2 6% 3 4 4 3 5% 7% 48%	1890
December	1st to 10th	Day	16% 6% 2 5% 3 3 3 3 4 6% 51%	3020
	11th to 20th	Day	13% 7% 2 5% 3 3 3 3 5% 6% 49%	3463
	21st to end	Day	16% 8% 2 7% 3 4 4 3 4 5% 44%	4565
January	1st to 10th	Night	12% 6% 3 6% 4 4 5% 4 5% 6% 46%	7635
	11th to 20th	Night	13% 7% 2 7% 4 4 4 3 5% 6% 46%	7458
	21st to end	Night	16% 8% 3 7% 4 4 4 3 5% 7% 38%	7745
February	1st to 10th	Night	13% 8% 3 5% 4 4 4 3 5% 6% 46%	2520
	11th to 20th	Night	17% 7% 2 6% 4 3 4 3 4 5% 45%	2458
	21st to end	Night	14% 7% 2 6% 5% 3 4 4 4 5% 46%	2076
March	1st to 10th	Night	19% 9% 3 6% 4 4 4 3 5% 6% 37%	5460
	11th to 20th	Night	10% 6% 1 5% 4 4 4 4 6% 7% 50%	5090
	21st to end	Night	11% 6% 3 6% 4 4 4 3 4 6% 49%	5588
April	1st to 10th	Night	10% 6% 3 6% 4 4 4 4 6% 7% 47%	2189
	11th to 20th	Night	10% 5% 2 6% 3 4 4 3 6% 7% 50%	2075
	21st to end	Night	7% 4 2 5% 4 4 4 4 6% 7% 53%	2100
May	1st to 10th	Night	15% 8% 3 6% 4 3 3 3 6% 8% 41%	5237
	11th to 20th	Night	12% 7% 2 6% 4 4 4 4 6% 9% 42%	5234
	21st to end	Night	7% 6% 2 7% 5% 5% 6% 5% 7% 13% 36%	5761
June	1st to 10th	Night	7% 7% 3 7% 6% 7% 6% 5% 8% 11% 34%	1890
	11th to 20th	Night	4 4 2 5% 5% 6% 8% 6% 7% 11% 42%	1890
	21st to end	Night	4 6% 1 9% 6% 5% 6% 5% 8% 10% 38%	1890
July	1st to 10th	Night	8% 6% 2 9% 6% 7% 9% 7% 10% 13% 22%	4148
	11th to 20th	Night	4 4 2 5% 5% 5% 7% 6% 11% 16% 35%	4147
	21st to end	Night	4 5% 2 9% 6% 7% 8% 7% 10% 12% 29%	4595
August	1st to 10th	Night	7% 5% 2 6% 5% 6% 6% 6% 10% 14% 33%	3244
	11th to 20th	Night	5% 4 2 6% 5% 5% 6% 5% 7% 10% 46%	3200
	21st to end	Night	6% 5% 2 7% 5% 5% 7% 6% 9% 12% 35%	3586
September	1st to 10th	Night	9% 6% 3 8% 6% 6% 7% 6% 8% 9% 33%	2135
	11th to 20th	Night	11% 7% 3 7% 5% 5% 4 5% 6% 8% 39%	2200
	21st to end	Night	8% 5% 2 6% 5% 5% 4 4 5% 7% 48%	2200
October	1st to 10th	Night	6% 6% 3 5% 4 4 4 4 6% 7% 52%	2200
	11th to 20th	Night	8% 4 1 3 3 2 4 2 5% 7% 62%	2200
	21st to end	Night	9% 5% 1 5% 4 4 3 3 5% 5% 56%	2624
November	1st to 10th	Night	8% 5% 2 5% 3 3 4 4 5% 5% 57%	2653
	11th to 20th	Night	11% 6% 1 4 3 3 3 3 4 6% 57%	2730
	21st to end	Night	12% 6% 2 5% 4 3 4 4 6% 6% 49%	2730
December	1st to 10th	Night	14% 5% 2 5% 3 3 3 2 4 6% 53%	4380
	11th to 20th	Night	13% 5% 2 5% 3 3 3 3 4 5% 53%	4952
	21st to end	Night	15% 8% 3 6% 3 3 3 3 4 5% 46%	6633

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% 3 8% 15% 29% 6%	5259
	11th to 20th	Day	32% 2 4 15% 32% 14%	5498
	21st to end	Day	44% 4 7% 16% 15% 13%	6436
February	1st to 10th	Day	42% 3 7% 16% 22% 10%	2100
	11th to 20th	Day	40% 4 6% 15% 24% 11%	2058
	21st to end	Day	41% 4 9% 16% 18% 12%	1730
March	1st to 10th	Day	43% 4 8% 17% 16% 11%	4598
	11th to 20th	Day	28% 4 9% 13% 22% 23%	5090
	21st to end	Day	38% 4 8% 21% 18% 11%	5586
April	1st to 10th	Day	37% 5% 9% 19% 17% 13%	2446
	11th to 20th	Day	35% 4 6% 19% 23% 13%	2494
	21st to end	Day	31% 6% 9% 22% 24% 8%	2520
May	1st to 10th	Day	44% 5% 10% 20% 16% 4	7649
	11th to 20th	Day	38% 6% 16% 24% 14% 2	7630
	21st to end	Day	40% 9% 16% 19% 15% 1	8405
June	1st to 10th	Day	40% 10% 15% 22% 11% 1	2730
	11th to 20th	Day	36% 9% 20% 22% 13% 2	2730
	21st to end	Day	41% 10% 20% 18% 10% 2	2730
July	1st to 10th	Day	43% 14% 27% 14% 2	5965
	11th to 20th	Day	34% 13% 33% 17% 3	5961
	21st to end	Day	41% 13% 25% 17% 3	6287
August	1st to 10th	Day	38% 9% 21% 21% 10% 1	3893
	11th to 20th	Day	32% 7% 16% 26% 18% 1	3885
	21st to end	Day	41% 8% 22% 18% 9% 1	4311
September	1st to 10th	Day	43% 11% 15% 14% 13% 4	2242
	11th to 20th	Day	40% 8% 11% 20% 16% 5%	2200
	21st to end	Day	35% 7% 10% 19% 22% 7%	2200
October	1st to 10th	Day	36% 3 7% 12% 18% 24%	3590
	11th to 20th	Day	17% 2 4 17% 25% 35%	3568
	21st to end	Day	20% 2 4 18% 38% 18%	3553
November	1st to 10th	Day	29% 3 8% 20% 25% 16%	1862
	11th to 20th	Day	30% 3 6% 18% 29% 14%	1890
	21st to end	Day	36% 4 7% 18% 22% 12%	1890
December	1st to 10th	Day	36% 3 8% 16% 29% 9%	3020
	11th to 20th	Day	37% 2 6% 23% 23% 9%	3460
	21st to end	Day	43% 3 5% 18% 26% 4	4565
January	1st to 10th	Night	38% 3 9% 13% 27% 9%	7636
	11th to 20th	Night	40% 3 5% 13% 27% 12%	7458
	21st to end	Night	45% 3 7% 18% 19% 8%	7745
February	1st to 10th	Night	39% 4 7% 15% 22% 13%	2520
	11th to 20th	Night	42% 3 7% 13% 20% 14%	2459
	21st to end	Night	40% 4 6% 17% 18% 15%	2076
March	1st to 10th	Night	48% 4 6% 13% 21% 9%	5460
	11th to 20th	Night	32% 4 9% 14% 19% 21%	5090
	21st to end	Night	37% 3 8% 20% 19% 13%	5588
April	1st to 10th	Night	35% 5% 11% 16% 19% 14%	2189
	11th to 20th	Night	33% 4 7% 18% 27% 11%	2075
	21st to end	Night	29% 4 10% 26% 22% 9%	2100
May	1st to 10th	Night	40% 5% 16% 17% 13% 7%	5264
	11th to 20th	Night	37% 7% 15% 22% 15% 3	5235
	21st to end	Night	38% 10% 18% 21% 11% 2	5771
June	1st to 10th	Night	39% 10% 19% 18% 12% 2	1890
	11th to 20th	Night	31% 12% 20% 23% 11% 3	1890
	21st to end	Night	36% 10% 23% 17% 11% 2	1890
July	1st to 10th	Night	47% 14% 26% 11% 2	4105
	11th to 20th	Night	32% 13% 38% 14% 2	4096
	21st to end	Night	42% 15% 24% 17% 3	4464
August	1st to 10th	Night	37% 11% 21% 22% 8% 1	3232
	11th to 20th	Night	30% 10% 21% 23% 15% 1	3230
	21st to end	Night	37% 9% 26% 18% 9% 1	3586
September	1st to 10th	Night	42% 11% 17% 15% 11% 4	2135
	11th to 20th	Night	40% 9% 11% 16% 19% 5%	2200
	21st to end	Night	34% 7% 13% 17% 21% 9%	2200
October	1st to 10th	Night	36% 5% 8% 11% 22% 19%	3590
	11th to 20th	Night	15% 2 4 15% 30% 33%	3571
	21st to end	Night	21% 3 3 14% 39% 20%	4236
November	1st to 10th	Night	29% 4 6% 18% 24% 19%	2653
	11th to 20th	Night	30% 3 6% 15% 30% 16%	2730
	21st to end	Night	35% 4 8% 18% 22% 14%	2730
December	1st to 10th	Night	33% 3 7% 19% 27% 11%	4380
	11th to 20th	Night	34% 3 7% 22% 24% 10%	4954
	21st to end	Night	41% 3 5% 19% 28% 4	6633

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	15% 14% 39% 25% 5% 1	330
	11th to 20th	Day	13% 15% 32% 28% 10% 2	330
	21st to end	Day	20% 13% 39% 21% 6% 1	363
February	1st to 10th	Day	18% 11% 40% 22% 10%	330
	11th to 20th	Day	22% 15% 32% 25% 6%	330
	21st to end	Day	16% 14% 39% 27% 4	273
March	1st to 10th	Day	15% 13% 32% 28% 11% 1	335
	11th to 20th	Day	14% 9% 32% 31% 11% 2	540
	21st to end	Day	13% 8% 32% 30% 14% 2	594
April	1st to 10th	Day	16% 10% 26% 29% 16% 3	540
	11th to 20th	Day	12% 7% 26% 29% 20% 5%	532
	21st to end	Day	9% 5% 25% 30% 23% 8%	540
May	1st to 10th	Day	10% 6% 22% 29% 23% 10%	543
	11th to 20th	Day	11% 2 14% 31% 27% 15%	567
	21st to end	Day	11% 1 12% 29% 26% 21%	617
June	1st to 10th	Day	13% 2 10% 25% 29% 22%	570
	11th to 20th	Day	8% 1 10% 20% 30% 30%	570
	21st to end	Day	7% 2 5% 21% 33% 33%	570
July	1st to 10th	Day	6% 1 4 12% 34% 43%	565
	11th to 20th	Day	7% 2 3 10% 28% 50%	564
	21st to end	Day	6% 1 4 13% 36% 39%	616
August	1st to 10th	Day	10% 2 2 16% 29% 41%	526
	11th to 20th	Day	9% 2 2 14% 36% 37%	519
	21st to end	Day	10% 3 7% 22% 33% 25%	583
September	1st to 10th	Day	12% 3 6% 22% 32% 25%	530
	11th to 20th	Day	15% 3 6% 25% 34% 17%	530
	21st to end	Day	12% 2 9% 24% 34% 18%	530
October	1st to 10th	Day	11% 4 19% 38% 21% 7%	530
	11th to 20th	Day	8% 3 19% 31% 28% 10%	530
	21st to end	Day	11% 6% 21% 32% 25% 4	583
November	1st to 10th	Day	16% 4 24% 29% 20% 7%	340
	11th to 20th	Day	9% 7% 35% 30% 17% 2	330
	21st to end	Day	12% 13% 26% 31% 15% 3	330
December	1st to 10th	Day	22% 8% 30% 26% 10% 3	330
	11th to 20th	Day	22% 8% 34% 23% 12% 1	330
	21st to end	Day	18% 8% 30% 27% 13% 3	363
January	1st to 10th	Night	17% 8% 36% 31% 7% 1	840
	11th to 20th	Night	15% 10% 29% 35% 10%	840
	21st to end	Night	21% 9% 33% 33% 5%	924
February	1st to 10th	Night	17% 7% 31% 36% 8%	840
	11th to 20th	Night	20% 9% 32% 32% 7%	823
	21st to end	Night	15% 10% 37% 33% 4	692
March	1st to 10th	Night	16% 6% 30% 39% 9%	840
	11th to 20th	Night	14% 6% 34% 33% 12% 1	840
	21st to end	Night	11% 8% 34% 36% 12%	924
April	1st to 10th	Night	13% 7% 27% 38% 15%	719
	11th to 20th	Night	13% 4 26% 36% 19% 1	623
	21st to end	Night	8% 3 23% 41% 23% 2	630
May	1st to 10th	Night	10% 3 24% 36% 25% 3	630
	11th to 20th	Night	9% 2 17% 38% 27% 6%	621
	21st to end	Night	9% 2 10% 34% 39% 6%	683
June	1st to 10th	Night	9% 3 6% 34% 42% 7%	630
	11th to 20th	Night	6% 1 8% 28% 46% 12%	630
	21st to end	Night	6% 1 5% 29% 46% 14%	630
July	1st to 10th	Night	7% 1 2 22% 50% 19%	615
	11th to 20th	Night	7% 2 1 15% 51% 24%	612
	21st to end	Night	4 1 2 23% 51% 19%	687
August	1st to 10th	Night	7% 2 2 22% 46% 21%	597
	11th to 20th	Night	9% 2 2 16% 54% 18%	594
	21st to end	Night	11% 3 6% 20% 44% 17%	660
September	1st to 10th	Night	12% 2 7% 24% 41% 14%	735
	11th to 20th	Night	15% 3 8% 30% 39% 6%	800
	21st to end	Night	11% 3 10% 31% 39% 6%	800
October	1st to 10th	Night	9% 2 20% 37% 28% 4	800
	11th to 20th	Night	10% 4 19% 33% 30% 3	800
	21st to end	Night	12% 3 20% 38% 25% 1	880
November	1st to 10th	Night	11% 4 22% 40% 21% 2	820
	11th to 20th	Night	14% 5% 27% 37% 16% 1	840
	21st to end	Night	15% 6% 28% 35% 15% 1	840
December	1st to 10th	Night	18% 6% 26% 34% 14% 2	840
	11th to 20th	Night	18% 4 29% 35% 13% 1	840
	21st to end	Night	24% 6% 26% 32% 12%	924

Page generated at 2026-07-28 02:25:22. Version ac07

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