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 2025-03-27.

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 6% 8% 42%	109431
	Night	11% 6% 2 6% 4 4 4 4 6% 8% 45%	109931
Transparency	Day	37% 6% 12% 18% 19% 8%	113338
	Night	36% 6% 11% 17% 20% 9%	114162
Seeing	Day	12% 5% 18% 24% 23% 17%	15269
	Night	13% 4 20% 32% 25% 5%	25351

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	12% 5% 2 6% 3 3 3 3 5% 5% 53%	4056
	11th to 20th	Day	14% 5% 2 4 3 3 3 4 5% 7% 51%	4222
	21st to end	Day	15% 7% 2 6% 4 4 5% 4 5% 7% 41%	4972
February	1st to 10th	Day	15% 7% 3 7% 5% 3 4 3 6% 6% 41%	2000
	11th to 20th	Day	17% 6% 3 5% 3 3 4 3 5% 6% 45%	1948
	21st to end	Day	15% 7% 2 6% 4 4 4 4 5% 7% 42%	1650
March	1st to 10th	Day	17% 8% 3 6% 4 4 4 4 6% 6% 36%	3238
	11th to 20th	Day	9% 5% 2 6% 6% 5% 4 4 6% 7% 47%	3590
	21st to end	Day	13% 6% 2 5% 5% 4 4 4 6% 8% 45%	3881
April	1st to 10th	Day	12% 5% 3 6% 5% 4 5% 4 5% 6% 46%	2213
	11th to 20th	Day	10% 6% 2 6% 5% 4 4 4 5% 7% 47%	2254
	21st to end	Day	6% 4 1 5% 5% 4 5% 4 5% 6% 54%	2280
May	1st to 10th	Day	7% 5% 2 6% 5% 5% 5% 4 7% 9% 45%	4080
	11th to 20th	Day	13% 7% 3 8% 5% 4 4 4 7% 7% 38%	4081
	21st to end	Day	5% 4 2 6% 4 4 5% 4 7% 10% 49%	4476
June	1st to 10th	Day	10% 6% 3 8% 5% 5% 6% 6% 8% 10% 33%	2470
	11th to 20th	Day	5% 4 2 6% 6% 6% 8% 5% 9% 12% 37%	2470
	21st to end	Day	5% 5% 2 8% 7% 7% 7% 7% 9% 11% 31%	2470
July	1st to 10th	Day	7% 7% 3 9% 7% 7% 8% 7% 10% 13% 21%	4120
	11th to 20th	Day	6% 5% 2 7% 5% 6% 7% 5% 8% 12% 36%	4120
	21st to end	Day	5% 6% 3 8% 7% 7% 9% 7% 10% 15% 22%	4411
August	1st to 10th	Day	6% 5% 2 6% 6% 6% 7% 6% 10% 12% 34%	3785
	11th to 20th	Day	6% 5% 2 6% 5% 5% 4 4 6% 9% 47%	3729
	21st to end	Day	6% 6% 3 8% 6% 7% 7% 5% 8% 11% 32%	4180
September	1st to 10th	Day	9% 8% 3 8% 6% 7% 8% 6% 8% 9% 31%	2130
	11th to 20th	Day	12% 7% 3 7% 6% 6% 5% 4 6% 9% 37%	2090
	21st to end	Day	10% 5% 3 6% 4 4 5% 4 6% 6% 47%	2090
October	1st to 10th	Day	9% 5% 1 6% 4 4 4 3 6% 7% 50%	2090
	11th to 20th	Day	9% 3 2 4 3 3 3 3 4 7% 60%	2090
	21st to end	Day	8% 4 2 5% 3 4 3 4 5% 6% 57%	2104
November	1st to 10th	Day	9% 5% 2 4 3 2 3 3 5% 6% 56%	1772
	11th to 20th	Day	10% 6% 2 4 3 3 4 3 5% 5% 55%	1800
	21st to end	Day	12% 6% 2 6% 3 4 4 3 5% 6% 49%	1800
December	1st to 10th	Day	15% 6% 2 4 3 3 3 3 4 6% 52%	2930
	11th to 20th	Day	13% 7% 2 5% 3 3 3 3 5% 6% 48%	3373
	21st to end	Day	16% 8% 2 7% 3 3 4 3 4 5% 44%	4466
January	1st to 10th	Night	13% 5% 3 5% 4 4 4 3 4 5% 50%	5889
	11th to 20th	Night	13% 7% 2 7% 5% 4 4 4 5% 6% 44%	5734
	21st to end	Night	16% 8% 3 6% 4 4 4 3 5% 8% 40%	5984
February	1st to 10th	Night	14% 7% 3 5% 4 4 4 4 5% 6% 45%	2400
	11th to 20th	Night	17% 7% 2 5% 4 3 4 3 4 5% 46%	2338
	21st to end	Night	14% 7% 2 6% 5% 3 4 4 5% 5% 46%	1980
March	1st to 10th	Night	21% 10% 3 7% 4 4 3 3 4 5% 35%	3833
	11th to 20th	Night	9% 5% 2 6% 4 4 5% 4 6% 8% 46%	3590
	21st to end	Night	12% 6% 3 6% 4 4 4 3 5% 6% 47%	3890
April	1st to 10th	Night	10% 5% 3 6% 4 4 4 4 5% 7% 47%	1981
	11th to 20th	Night	10% 5% 2 7% 4 4 4 4 6% 7% 47%	1875
	21st to end	Night	7% 4 1 5% 4 4 4 4 6% 7% 55%	1900
May	1st to 10th	Night	8% 7% 2 6% 4 3 4 4 6% 9% 47%	2813
	11th to 20th	Night	11% 7% 2 7% 5% 4 4 4 5% 8% 43%	2812
	21st to end	Night	5% 4 1 6% 4 4 4 5% 6% 13% 48%	3079
June	1st to 10th	Night	7% 6% 3 7% 5% 7% 6% 6% 9% 11% 34%	1710
	11th to 20th	Night	3 4 2 5% 5% 5% 8% 6% 8% 11% 43%	1710
	21st to end	Night	5% 6% 2 9% 6% 6% 6% 5% 9% 11% 36%	1710
July	1st to 10th	Night	9% 7% 3 9% 7% 7% 8% 7% 10% 13% 22%	2840
	11th to 20th	Night	4 4 2 5% 4 5% 7% 6% 10% 13% 40%	2840
	21st to end	Night	4 5% 3 10% 7% 6% 8% 6% 11% 12% 28%	3137
August	1st to 10th	Night	7% 5% 2 6% 5% 6% 6% 6% 9% 14% 34%	3144
	11th to 20th	Night	4 4 2 6% 5% 5% 6% 5% 7% 10% 46%	3100
	21st to end	Night	6% 5% 2 7% 5% 5% 7% 7% 9% 12% 35%	3476
September	1st to 10th	Night	9% 6% 3 8% 7% 6% 7% 6% 8% 9% 31%	2028
	11th to 20th	Night	11% 7% 3 7% 5% 5% 5% 4 6% 8% 37%	2090
	21st to end	Night	8% 5% 2 6% 5% 5% 4 4 5% 7% 48%	2090
October	1st to 10th	Night	6% 6% 3 5% 4 4 4 3 6% 7% 52%	2090
	11th to 20th	Night	9% 4 1 3 3 2 4 2 4 7% 61%	2090
	21st to end	Night	9% 5% 1 5% 4 4 3 3 5% 5% 56%	2493
November	1st to 10th	Night	9% 5% 2 5% 3 3 4 4 5% 5% 56%	2523
	11th to 20th	Night	11% 6% 1 4 3 3 3 3 4 6% 55%	2600
	21st to end	Night	12% 6% 2 5% 4 3 3 4 6% 6% 49%	2600
December	1st to 10th	Night	13% 5% 2 5% 3 3 3 2 4 6% 54%	4250
	11th to 20th	Night	14% 5% 2 5% 3 3 3 3 4 6% 52%	4822
	21st to end	Night	16% 8% 3 6% 3 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	33% 3 5% 15% 35% 8%	4057
	11th to 20th	Day	34% 3 4 14% 32% 12%	4222
	21st to end	Day	43% 4 8% 16% 16% 13%	4972
February	1st to 10th	Day	43% 3 7% 16% 21% 9%	2000
	11th to 20th	Day	40% 3 6% 15% 25% 11%	1958
	21st to end	Day	41% 5% 8% 17% 18% 11%	1650
March	1st to 10th	Day	46% 5% 8% 18% 15% 7%	3238
	11th to 20th	Day	33% 5% 11% 14% 21% 14%	3590
	21st to end	Day	37% 5% 10% 21% 18% 10%	3881
April	1st to 10th	Day	38% 5% 9% 19% 17% 13%	2213
	11th to 20th	Day	37% 5% 6% 19% 22% 12%	2254
	21st to end	Day	30% 5% 9% 23% 25% 9%	2280
May	1st to 10th	Day	33% 7% 11% 23% 21% 5%	4118
	11th to 20th	Day	43% 7% 10% 22% 16% 2	4085
	21st to end	Day	28% 9% 15% 28% 18% 2	4489
June	1st to 10th	Day	40% 11% 14% 23% 10% 1	2470
	11th to 20th	Day	34% 9% 18% 23% 14% 2	2470
	21st to end	Day	42% 11% 20% 16% 11% 2	2470
July	1st to 10th	Day	47% 14% 27% 10% 2	4055
	11th to 20th	Day	37% 13% 31% 15% 4	4051
	21st to end	Day	45% 15% 23% 13% 4	4270
August	1st to 10th	Day	37% 9% 21% 21% 10% 1	3773
	11th to 20th	Day	32% 7% 15% 27% 18% 1	3765
	21st to end	Day	41% 9% 22% 18% 9% 1	4179
September	1st to 10th	Day	45% 11% 15% 13% 12% 4	2130
	11th to 20th	Day	42% 8% 12% 18% 14% 6%	2090
	21st to end	Day	35% 6% 10% 18% 22% 8%	2090
October	1st to 10th	Day	35% 3 7% 12% 19% 24%	3480
	11th to 20th	Day	17% 2 4 18% 24% 35%	3458
	21st to end	Day	19% 2 4 18% 39% 18%	3442
November	1st to 10th	Day	29% 3 8% 20% 24% 15%	1772
	11th to 20th	Day	31% 3 6% 17% 28% 15%	1800
	21st to end	Day	36% 4 7% 18% 23% 12%	1800
December	1st to 10th	Day	35% 3 8% 16% 29% 9%	2930
	11th to 20th	Day	37% 3 6% 23% 23% 8%	3370
	21st to end	Day	43% 3 5% 18% 26% 4	4466
January	1st to 10th	Night	37% 3 5% 12% 32% 12%	5889
	11th to 20th	Night	41% 3 5% 13% 28% 10%	5734
	21st to end	Night	43% 3 7% 18% 20% 9%	5984
February	1st to 10th	Night	40% 4 7% 15% 22% 12%	2400
	11th to 20th	Night	42% 3 7% 13% 20% 15%	2339
	21st to end	Night	40% 4 6% 17% 17% 15%	1980
March	1st to 10th	Night	52% 5% 7% 13% 16% 8%	3833
	11th to 20th	Night	34% 5% 10% 17% 20% 13%	3590
	21st to end	Night	38% 4 8% 18% 21% 11%	3890
April	1st to 10th	Night	34% 5% 11% 16% 20% 14%	1981
	11th to 20th	Night	36% 5% 7% 18% 23% 11%	1875
	21st to end	Night	27% 4 9% 26% 23% 9%	1900
May	1st to 10th	Night	31% 8% 15% 20% 19% 6%	2840
	11th to 20th	Night	37% 8% 13% 23% 16% 4	2813
	21st to end	Night	26% 8% 17% 28% 18% 3	3087
June	1st to 10th	Night	38% 11% 19% 20% 11% 2	1710
	11th to 20th	Night	29% 12% 19% 25% 12% 3	1710
	21st to end	Night	38% 10% 23% 15% 11% 2	1710
July	1st to 10th	Night	48% 14% 25% 10% 3	2795
	11th to 20th	Night	31% 14% 36% 16% 3	2786
	21st to end	Night	44% 17% 22% 13% 4	3037
August	1st to 10th	Night	36% 11% 21% 22% 8% 1	3132
	11th to 20th	Night	31% 10% 20% 23% 15% 1	3130
	21st to end	Night	36% 10% 26% 18% 9% 1	3476
September	1st to 10th	Night	43% 12% 16% 14% 11% 4	2028
	11th to 20th	Night	42% 9% 11% 15% 17% 5%	2090
	21st to end	Night	34% 7% 13% 17% 21% 9%	2090
October	1st to 10th	Night	36% 5% 7% 11% 22% 19%	3480
	11th to 20th	Night	15% 2 4 15% 30% 33%	3461
	21st to end	Night	20% 3 3 14% 40% 20%	4105
November	1st to 10th	Night	29% 4 6% 18% 24% 18%	2523
	11th to 20th	Night	31% 3 6% 14% 30% 16%	2600
	21st to end	Night	35% 4 7% 17% 22% 14%	2600
December	1st to 10th	Night	32% 3 7% 19% 27% 11%	4250
	11th to 20th	Night	34% 3 7% 22% 24% 9%	4824
	21st to end	Night	41% 3 5% 18% 28% 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	16% 13% 40% 23% 6% 1	300
	11th to 20th	Day	13% 13% 32% 30% 10% 2	300
	21st to end	Day	20% 12% 39% 22% 6% 1	330
February	1st to 10th	Day	18% 10% 38% 23% 11%	300
	11th to 20th	Day	23% 13% 32% 25% 7%	300
	21st to end	Day	13% 14% 41% 29% 4	249
March	1st to 10th	Day	16% 15% 33% 26% 9% 1	305
	11th to 20th	Day	15% 10% 32% 31% 11% 2	500
	21st to end	Day	13% 9% 33% 29% 15% 2	530
April	1st to 10th	Day	16% 10% 25% 30% 17% 3	460
	11th to 20th	Day	13% 7% 27% 28% 20% 5%	452
	21st to end	Day	10% 5% 23% 31% 23% 8%	460
May	1st to 10th	Day	7% 5% 21% 29% 26% 12%	463
	11th to 20th	Day	11% 2 11% 30% 29% 17%	487
	21st to end	Day	10% 1 9% 29% 27% 24%	529
June	1st to 10th	Day	13% 2 8% 24% 28% 25%	490
	11th to 20th	Day	7% 1 10% 20% 29% 33%	490
	21st to end	Day	7% 1 5% 22% 32% 33%	490
July	1st to 10th	Day	6% 2 4 11% 33% 44%	485
	11th to 20th	Day	8% 2 2 7% 25% 55%	484
	21st to end	Day	7% 1 4 11% 35% 43%	532
August	1st to 10th	Day	9% 2 2 15% 29% 43%	486
	11th to 20th	Day	9% 2 2 13% 35% 39%	479
	21st to end	Day	10% 3 4 22% 35% 26%	539
September	1st to 10th	Day	13% 3 5% 20% 33% 26%	490
	11th to 20th	Day	16% 3 6% 24% 34% 17%	490
	21st to end	Day	12% 2 9% 23% 34% 20%	490
October	1st to 10th	Day	12% 3 18% 37% 22% 8%	490
	11th to 20th	Day	8% 4 19% 30% 28% 10%	490
	21st to end	Day	11% 6% 19% 33% 27% 5%	539
November	1st to 10th	Day	16% 5% 23% 29% 20% 7%	310
	11th to 20th	Day	10% 7% 36% 28% 16% 2	300
	21st to end	Day	12% 12% 24% 32% 15% 4	300
December	1st to 10th	Day	19% 8% 30% 28% 11% 4	300
	11th to 20th	Day	23% 7% 35% 22% 12% 1	300
	21st to end	Day	20% 7% 31% 27% 12% 3	330
January	1st to 10th	Night	17% 8% 37% 30% 7% 1	800
	11th to 20th	Night	15% 10% 29% 36% 10%	800
	21st to end	Night	21% 8% 33% 33% 5%	880
February	1st to 10th	Night	17% 7% 30% 37% 9% 1	800
	11th to 20th	Night	20% 9% 31% 32% 8%	783
	21st to end	Night	15% 9% 38% 34% 4	660
March	1st to 10th	Night	17% 7% 31% 38% 8%	800
	11th to 20th	Night	14% 6% 35% 33% 12% 1	800
	21st to end	Night	11% 8% 33% 36% 12%	863
April	1st to 10th	Night	13% 6% 28% 38% 15%	651
	11th to 20th	Night	15% 4 27% 35% 19% 1	563
	21st to end	Night	9% 2 24% 40% 24% 2	570
May	1st to 10th	Night	8% 3 23% 36% 27% 3	570
	11th to 20th	Night	8% 2 16% 39% 29% 7%	561
	21st to end	Night	8% 2 9% 34% 41% 6%	617
June	1st to 10th	Night	9% 2 5% 34% 42% 7%	570
	11th to 20th	Night	4 1 8% 28% 47% 12%	570
	21st to end	Night	6% 1 5% 29% 44% 15%	570
July	1st to 10th	Night	7% 1 2 21% 49% 20%	555
	11th to 20th	Night	8% 2 1 15% 49% 26%	552
	21st to end	Night	4 1 1 22% 51% 20%	624
August	1st to 10th	Night	6% 2 2 20% 48% 22%	567
	11th to 20th	Night	9% 2 2 16% 53% 18%	564
	21st to end	Night	11% 2 5% 19% 46% 17%	627
September	1st to 10th	Night	12% 2 6% 23% 42% 15%	698
	11th to 20th	Night	16% 3 8% 28% 39% 6%	760
	21st to end	Night	11% 3 9% 30% 40% 7%	760
October	1st to 10th	Night	9% 2 19% 37% 29% 4	760
	11th to 20th	Night	11% 4 19% 33% 29% 3	760
	21st to end	Night	12% 3 19% 38% 26% 1	836
November	1st to 10th	Night	12% 3 22% 40% 21% 3	780
	11th to 20th	Night	14% 5% 27% 37% 16% 1	800
	21st to end	Night	16% 6% 27% 35% 16% 1	800
December	1st to 10th	Night	16% 6% 27% 35% 15% 2	800
	11th to 20th	Night	19% 4 29% 35% 13% 1	800
	21st to end	Night	25% 6% 26% 32% 11%	880

Page generated at 2025-03-24 08:04:27. Version ac07

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