Conecuh National Forest
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Conecuh National Forest clear sky chart from 2005-11-06 to 2024-11-05.

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	11% 6% 2 6% 5% 5% 5% 4 6% 8% 41%	100726
	Night	11% 6% 2 6% 4 4 4 4 6% 8% 44%	98292
Transparency	Day	21% 48% 7% 10% 9% 5%	104641
	Night	20% 48% 7% 9% 11% 5%	102515
Seeing	Day	14% 9% 22% 25% 20% 11%	14622
	Night	13% 8% 22% 29% 22% 5%	24553

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	15% 6% 2 6% 4 3 4 3 5% 8% 45%	2836
	11th to 20th	Day	11% 5% 2 4 2 3 3 3 6% 6% 54%	3160
	21st to end	Day	24% 6% 2 5% 4 3 3 3 4 6% 40%	3476
February	1st to 10th	Day	17% 7% 2 7% 4 4 4 2 4 6% 42%	1900
	11th to 20th	Day	16% 7% 2 5% 4 3 4 3 5% 6% 45%	1848
	21st to end	Day	16% 7% 2 6% 5% 5% 5% 3 6% 5% 39%	1570
March	1st to 10th	Day	18% 9% 3 7% 4 5% 4 3 6% 6% 36%	3120
	11th to 20th	Day	11% 6% 2 7% 4 5% 5% 4 6% 7% 43%	3352
	21st to end	Day	13% 5% 3 6% 4 5% 4 4 5% 6% 44%	3964
April	1st to 10th	Day	12% 7% 2 6% 4 4 4 3 5% 7% 47%	2280
	11th to 20th	Day	13% 5% 2 6% 5% 5% 4 3 5% 6% 45%	2254
	21st to end	Day	8% 5% 2 5% 5% 3 5% 4 5% 6% 53%	2280
May	1st to 10th	Day	8% 5% 2 6% 5% 5% 5% 4 7% 9% 45%	3883
	11th to 20th	Day	13% 6% 2 8% 5% 5% 5% 4 5% 8% 40%	4081
	21st to end	Day	6% 4 2 6% 5% 5% 5% 5% 7% 9% 45%	4476
June	1st to 10th	Day	9% 6% 3 8% 7% 7% 7% 6% 8% 9% 30%	2470
	11th to 20th	Day	6% 4 2 6% 6% 7% 7% 6% 9% 11% 36%	2470
	21st to end	Day	7% 6% 2 7% 7% 6% 8% 7% 8% 11% 30%	2470
July	1st to 10th	Day	7% 8% 3 10% 8% 8% 8% 7% 9% 12% 20%	4120
	11th to 20th	Day	5% 5% 3 8% 7% 6% 7% 6% 9% 11% 32%	4120
	21st to end	Day	5% 6% 3 9% 8% 9% 8% 7% 10% 14% 21%	4124
August	1st to 10th	Day	5% 3 2 5% 5% 6% 7% 7% 9% 13% 38%	3785
	11th to 20th	Day	6% 5% 2 7% 5% 5% 6% 4 6% 8% 46%	3729
	21st to end	Day	7% 5% 3 7% 6% 7% 7% 6% 8% 11% 34%	4180
September	1st to 10th	Day	11% 8% 3 8% 6% 6% 6% 5% 7% 8% 33%	2209
	11th to 20th	Day	13% 7% 3 8% 6% 6% 6% 4 5% 7% 36%	2090
	21st to end	Day	9% 5% 2 7% 5% 4 5% 4 5% 6% 48%	2090
October	1st to 10th	Day	9% 4 2 6% 3 4 4 3 4 7% 54%	2090
	11th to 20th	Day	10% 4 1 5% 3 3 3 2 5% 6% 58%	2090
	21st to end	Day	9% 5% 2 4 4 4 3 2 4 5% 57%	2094
November	1st to 10th	Day	9% 5% 2 4 3 3 3 3 6% 6% 57%	1708
	11th to 20th	Day	10% 5% 2 5% 4 4 4 4 4 7% 53%	1710
	21st to end	Day	14% 4 2 5% 4 4 4 3 5% 7% 48%	1710
December	1st to 10th	Day	14% 6% 2 5% 4 4 5% 2 5% 7% 46%	1710
	11th to 20th	Day	16% 9% 3 5% 4 4 4 3 4 5% 43%	2153
	21st to end	Day	19% 9% 3 6% 3 3 3 3 4 5% 42%	3124
January	1st to 10th	Night	17% 6% 2 4 4 4 5% 3 5% 6% 45%	4105
	11th to 20th	Night	12% 7% 2 6% 3 3 4 3 5% 6% 49%	3800
	21st to end	Night	24% 9% 2 5% 3 3 3 3 4 5% 39%	4180
February	1st to 10th	Night	15% 9% 2 6% 4 3 4 3 5% 6% 44%	2280
	11th to 20th	Night	19% 8% 2 5% 3 2 3 2 5% 5% 46%	2218
	21st to end	Night	16% 9% 2 5% 5% 4 4 4 5% 5% 42%	1884
March	1st to 10th	Night	22% 12% 4 7% 4 3 3 2 4 5% 33%	3733
	11th to 20th	Night	10% 7% 2 6% 4 5% 5% 4 6% 8% 44%	3608
	21st to end	Night	13% 7% 3 7% 4 3 4 3 5% 6% 45%	3693
April	1st to 10th	Night	12% 7% 2 5% 4 4 4 4 6% 8% 46%	1900
	11th to 20th	Night	13% 5% 3 5% 4 3 4 3 6% 8% 46%	1875
	21st to end	Night	6% 3 1 5% 4 3 3 3 6% 7% 59%	1900
May	1st to 10th	Night	9% 7% 2 7% 4 4 5% 4 6% 8% 44%	3008
	11th to 20th	Night	14% 6% 2 6% 4 4 4 4 6% 7% 42%	2812
	21st to end	Night	6% 4 2 4 4 4 4 3 8% 11% 50%	3079
June	1st to 10th	Night	8% 5% 2 7% 4 6% 6% 4 9% 10% 38%	1710
	11th to 20th	Night	5% 4 1 4 5% 4 6% 5% 9% 13% 44%	1710
	21st to end	Night	5% 5% 2 7% 6% 5% 5% 5% 8% 12% 40%	1710
July	1st to 10th	Night	6% 6% 2 7% 6% 7% 6% 7% 11% 15% 27%	2840
	11th to 20th	Night	4 4 2 5% 5% 6% 6% 6% 8% 14% 40%	2840
	21st to end	Night	3 4 3 8% 6% 7% 8% 8% 11% 14% 28%	3424
August	1st to 10th	Night	4 4 1 6% 4 5% 7% 5% 9% 13% 41%	3144
	11th to 20th	Night	4 3 2 5% 5% 5% 5% 5% 8% 12% 47%	3100
	21st to end	Night	5% 5% 2 7% 6% 6% 7% 6% 9% 11% 36%	3476
September	1st to 10th	Night	9% 8% 2 6% 5% 5% 6% 5% 7% 12% 35%	1951
	11th to 20th	Night	11% 6% 2 7% 5% 5% 5% 5% 6% 9% 39%	2090
	21st to end	Night	9% 5% 2 6% 5% 4 4 4 6% 7% 49%	2090
October	1st to 10th	Night	8% 5% 2 5% 3 4 4 3 6% 7% 53%	2090
	11th to 20th	Night	8% 5% 1 3 2 2 3 3 5% 6% 61%	2090
	21st to end	Night	10% 5% 2 4 3 3 4 2 4 5% 57%	2498
November	1st to 10th	Night	8% 5% 2 4 3 2 4 3 4 7% 59%	2470
	11th to 20th	Night	11% 6% 2 4 3 2 3 4 5% 7% 55%	2470
	21st to end	Night	14% 6% 2 4 3 4 4 4 5% 6% 49%	2470
December	1st to 10th	Night	14% 7% 2 5% 3 3 3 3 5% 7% 46%	2470
	11th to 20th	Night	16% 7% 2 5% 4 4 3 3 4 6% 46%	3042
	21st to end	Night	17% 9% 3 7% 5% 4 3 3 4 5% 40%	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	25% 37% 4 13% 13% 8%	2837
	11th to 20th	Day	17% 37% 4 12% 22% 8%	3160
	21st to end	Day	30% 39% 3 8% 12% 7%	3476
February	1st to 10th	Day	18% 64% 2 4 7% 4	1900
	11th to 20th	Day	16% 64% 2 7% 8% 3	1858
	21st to end	Day	17% 65% 4 5% 5% 5%	1570
March	1st to 10th	Day	36% 41% 6% 10% 5% 2	3120
	11th to 20th	Day	25% 41% 5% 12% 11% 6%	3352
	21st to end	Day	26% 40% 6% 9% 10% 8%	3964
April	1st to 10th	Day	14% 65% 3 6% 7% 5%	2280
	11th to 20th	Day	16% 65% 3 7% 6% 3	2254
	21st to end	Day	13% 65% 4 7% 7% 4	2280
May	1st to 10th	Day	21% 41% 8% 15% 11% 3	3918
	11th to 20th	Day	29% 40% 5% 14% 10% 1	4085
	21st to end	Day	20% 41% 9% 20% 10% 1	4489
June	1st to 10th	Day	18% 66% 6% 7% 3	2470
	11th to 20th	Day	17% 67% 5% 6% 3 1	2470
	21st to end	Day	16% 66% 7% 6% 4 1	2470
July	1st to 10th	Day	30% 45% 18% 6% 1	4055
	11th to 20th	Day	23% 45% 22% 9% 1	4051
	21st to end	Day	31% 45% 14% 7% 3	3992
August	1st to 10th	Day	16% 41% 11% 17% 12% 2	3773
	11th to 20th	Day	15% 40% 10% 18% 17% 1	3765
	21st to end	Day	20% 43% 17% 12% 7%	4179
September	1st to 10th	Day	19% 63% 6% 3 6% 2	2209
	11th to 20th	Day	17% 61% 6% 8% 6% 2	2090
	21st to end	Day	14% 61% 5% 11% 7% 2	2090
October	1st to 10th	Day	20% 37% 3 6% 10% 23%	3480
	11th to 20th	Day	8% 36% 3 10% 14% 29%	3458
	21st to end	Day	10% 37% 2 10% 28% 13%	3434
November	1st to 10th	Day	16% 58% 5% 9% 8% 6%	1708
	11th to 20th	Day	15% 60% 4 7% 10% 4	1710
	21st to end	Day	13% 60% 3 11% 8% 5%	1710
December	1st to 10th	Day	19% 60% 4 6% 8% 3	1710
	11th to 20th	Day	23% 47% 1 7% 14% 7%	2150
	21st to end	Day	31% 37% 3 11% 13% 5%	3124
January	1st to 10th	Night	28% 37% 3 6% 17% 10%	4105
	11th to 20th	Night	23% 36% 3 8% 20% 9%	3800
	21st to end	Night	31% 39% 2 9% 15% 3	4180
February	1st to 10th	Night	15% 65% 3 5% 9% 3	2280
	11th to 20th	Night	15% 64% 3 5% 8% 4	2219
	21st to end	Night	16% 65% 4 4 5% 5%	1884
March	1st to 10th	Night	42% 41% 5% 7% 4 2	3733
	11th to 20th	Night	25% 41% 6% 8% 14% 6%	3608
	21st to end	Night	27% 40% 5% 12% 10% 6%	3693
April	1st to 10th	Night	14% 65% 4 5% 6% 6%	1900
	11th to 20th	Night	14% 65% 2 8% 6% 4	1875
	21st to end	Night	9% 66% 4 9% 9% 3	1900
May	1st to 10th	Night	26% 40% 11% 11% 9% 3	3038
	11th to 20th	Night	28% 41% 6% 14% 10% 1	2813
	21st to end	Night	16% 41% 11% 20% 10% 1	3087
June	1st to 10th	Night	15% 67% 7% 8% 3 1	1710
	11th to 20th	Night	9% 69% 9% 7% 5% 1	1710
	21st to end	Night	12% 68% 10% 5% 4 1	1710
July	1st to 10th	Night	27% 45% 21% 7% 1	2795
	11th to 20th	Night	18% 44% 28% 9% 1	2786
	21st to end	Night	28% 50% 12% 7% 2	3315
August	1st to 10th	Night	19% 42% 14% 15% 10% 1	3132
	11th to 20th	Night	12% 42% 15% 17% 14%	3130
	21st to end	Night	20% 43% 17% 13% 7% 1	3476
September	1st to 10th	Night	15% 64% 9% 5% 5% 3	1951
	11th to 20th	Night	15% 62% 7% 8% 7% 2	2090
	21st to end	Night	12% 62% 7% 10% 6% 2	2090
October	1st to 10th	Night	24% 38% 5% 6% 12% 14%	3480
	11th to 20th	Night	5% 36% 2 12% 18% 28%	3461
	21st to end	Night	10% 37% 2 9% 30% 12%	4108
November	1st to 10th	Night	15% 58% 5% 8% 10% 4	2470
	11th to 20th	Night	15% 59% 3 8% 11% 4	2470
	21st to end	Night	14% 60% 3 9% 9% 5%	2470
December	1st to 10th	Night	20% 60% 4 7% 7% 2	2470
	11th to 20th	Night	19% 49% 3 5% 18% 7%	3044
	21st to end	Night	33% 37% 4 10% 15% 2	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	21% 20% 39% 15% 4	270
	11th to 20th	Day	17% 17% 37% 20% 8% 1	270
	21st to end	Day	26% 22% 37% 12% 3	297
February	1st to 10th	Day	27% 21% 34% 14% 4	270
	11th to 20th	Day	26% 21% 34% 17% 2	270
	21st to end	Day	18% 28% 38% 14% 3	225
March	1st to 10th	Day	18% 23% 39% 15% 5%	270
	11th to 20th	Day	20% 17% 35% 20% 7% 1	384
	21st to end	Day	18% 16% 33% 23% 9% 1	506
April	1st to 10th	Day	22% 15% 30% 20% 11% 2	460
	11th to 20th	Day	17% 15% 30% 24% 12% 2	452
	21st to end	Day	10% 10% 31% 28% 17% 3	460
May	1st to 10th	Day	9% 10% 28% 26% 20% 7%	463
	11th to 20th	Day	7% 5% 23% 32% 20% 12%	487
	21st to end	Day	10% 3 22% 31% 20% 15%	529
June	1st to 10th	Day	13% 2 13% 31% 26% 15%	490
	11th to 20th	Day	8% 5% 12% 30% 26% 19%	490
	21st to end	Day	8% 3 12% 28% 27% 22%	490
July	1st to 10th	Day	8% 2 6% 25% 31% 27%	485
	11th to 20th	Day	7% 2 4 19% 35% 33%	484
	21st to end	Day	6% 2 8% 23% 36% 26%	532
August	1st to 10th	Day	8% 1 6% 19% 35% 31%	486
	11th to 20th	Day	10% 1 7% 20% 36% 27%	479
	21st to end	Day	10% 2 9% 31% 27% 20%	539
September	1st to 10th	Day	11% 2 10% 27% 29% 20%	490
	11th to 20th	Day	16% 4 12% 29% 32% 8%	490
	21st to end	Day	11% 2 14% 30% 30% 12%	490
October	1st to 10th	Day	10% 5% 28% 33% 20% 5%	490
	11th to 20th	Day	9% 7% 20% 33% 23% 7%	490
	21st to end	Day	13% 10% 22% 33% 20% 2	425
November	1st to 10th	Day	16% 7% 28% 34% 11% 4	282
	11th to 20th	Day	14% 16% 36% 28% 6% 1	270
	21st to end	Day	15% 14% 36% 22% 11% 1	270
December	1st to 10th	Day	21% 15% 33% 23% 7% 2	270
	11th to 20th	Day	26% 17% 33% 18% 6%	270
	21st to end	Day	28% 12% 31% 19% 9% 1	297
January	1st to 10th	Night	20% 15% 33% 26% 6%	760
	11th to 20th	Night	18% 16% 26% 31% 9%	760
	21st to end	Night	22% 16% 34% 24% 4	836
February	1st to 10th	Night	20% 12% 35% 27% 6% 1	760
	11th to 20th	Night	23% 15% 29% 26% 7%	743
	21st to end	Night	20% 16% 36% 25% 3	628
March	1st to 10th	Night	17% 12% 34% 29% 7%	760
	11th to 20th	Night	16% 13% 32% 28% 10% 1	760
	21st to end	Night	13% 15% 31% 31% 9%	763
April	1st to 10th	Night	15% 10% 26% 37% 11%	570
	11th to 20th	Night	15% 9% 31% 27% 17% 1	563
	21st to end	Night	7% 7% 28% 39% 18% 1	570
May	1st to 10th	Night	9% 5% 25% 38% 21% 2	570
	11th to 20th	Night	10% 2 19% 35% 29% 5%	561
	21st to end	Night	9% 2 12% 36% 36% 5%	617
June	1st to 10th	Night	10% 2 9% 35% 36% 8%	570
	11th to 20th	Night	5% 2 9% 32% 41% 12%	570
	21st to end	Night	5% 1 10% 28% 43% 13%	570
July	1st to 10th	Night	5% 2 5% 23% 47% 17%	555
	11th to 20th	Night	7% 1 4 19% 43% 27%	552
	21st to end	Night	3 4 24% 51% 18%	624
August	1st to 10th	Night	5% 1 4 18% 47% 25%	567
	11th to 20th	Night	7% 1 3 22% 45% 21%	564
	21st to end	Night	10% 1 7% 23% 43% 15%	627
September	1st to 10th	Night	10% 4 8% 24% 40% 14%	621
	11th to 20th	Night	14% 2 14% 29% 35% 6%	760
	21st to end	Night	10% 2 15% 31% 35% 6%	760
October	1st to 10th	Night	9% 3 28% 33% 24% 3	760
	11th to 20th	Night	10% 6% 22% 32% 27% 3	760
	21st to end	Night	14% 6% 23% 33% 22% 1	836
November	1st to 10th	Night	12% 5% 26% 37% 18% 3	760
	11th to 20th	Night	15% 10% 27% 34% 14% 1	760
	21st to end	Night	17% 10% 26% 32% 14% 1	760
December	1st to 10th	Night	18% 11% 28% 29% 15%	760
	11th to 20th	Night	19% 10% 31% 28% 12%	760
	21st to end	Night	24% 11% 28% 27% 9%	836

Page generated at 2024-11-03 01:11:13. Version ac07

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