Maumelle
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Maumelle clear sky chart from 2005-11-06 to 2026-05-17.

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	12% 6% 2 6% 4 4 4 4 5% 7% 45%	131226
	Night	13% 6% 2 5% 4 3 4 3 5% 6% 50%	131805
Transparency	Day	38% 3 9% 25% 20% 5%	134832
	Night	35% 2 9% 24% 22% 7%	136277
Seeing	Day	16% 9% 24% 26% 19% 6%	17342
	Night	16% 8% 25% 32% 18% 2	27223

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	16% 8% 3 7% 3 3 3 3 4 5% 46%	5289
	11th to 20th	Day	9% 8% 2 6% 4 3 3 3 4 4 55%	5310
	21st to end	Day	21% 6% 3 5% 3 2 2 2 3 4 48%	5812
February	1st to 10th	Day	22% 8% 2 5% 4 3 3 3 3 5% 42%	1890
	11th to 20th	Day	18% 8% 3 6% 4 4 3 3 4 6% 42%	1986
	21st to end	Day	20% 8% 2 6% 4 4 3 3 4 5% 40%	1777
March	1st to 10th	Day	20% 9% 3 7% 4 4 4 2 4 5% 37%	5046
	11th to 20th	Day	10% 5% 2 5% 4 3 4 3 4 6% 52%	5090
	21st to end	Day	14% 8% 4 6% 5% 4 4 3 4 6% 44%	5583
April	1st to 10th	Day	15% 6% 2 6% 4 3 4 4 5% 6% 45%	2520
	11th to 20th	Day	14% 7% 2 7% 4 3 4 3 4 7% 45%	2494
	21st to end	Day	15% 7% 2 7% 5% 5% 4 4 6% 7% 39%	2520
May	1st to 10th	Day	17% 8% 3 7% 5% 5% 4 3 5% 7% 37%	5525
	11th to 20th	Day	12% 6% 3 7% 5% 5% 5% 5% 6% 8% 39%	5864
	21st to end	Day	14% 7% 3 8% 5% 5% 6% 4 6% 8% 33%	6434
June	1st to 10th	Day	9% 6% 2 5% 5% 5% 6% 5% 7% 8% 43%	2765
	11th to 20th	Day	5% 4 1 5% 6% 5% 5% 5% 7% 10% 46%	2800
	21st to end	Day	4 4 2 4 4 4 6% 5% 7% 11% 49%	2636
July	1st to 10th	Day	6% 5% 2 7% 5% 5% 6% 6% 9% 11% 37%	5900
	11th to 20th	Day	4 3 2 4 4 4 5% 4 7% 10% 52%	5900
	21st to end	Day	8% 6% 3 7% 5% 6% 5% 5% 7% 9% 40%	6422
August	1st to 10th	Day	3 3 1 3 3 3 4 4 6% 9% 61%	4234
	11th to 20th	Day	9% 5% 2 7% 4 5% 5% 5% 7% 10% 42%	3858
	21st to end	Day	5% 4 1 5% 4 5% 5% 4 7% 8% 52%	4312
September	1st to 10th	Day	11% 6% 2 5% 5% 4 4 3 7% 8% 46%	2400
	11th to 20th	Day	13% 6% 2 5% 4 3 5% 4 6% 6% 46%	2400
	21st to end	Day	10% 4 2 5% 4 4 4 3 5% 6% 53%	2090
October	1st to 10th	Day	6% 5% 2 5% 3 3 3 2 5% 6% 60%	2000
	11th to 20th	Day	14% 4 2 3 2 2 2 2 4 5% 58%	2000
	21st to end	Day	18% 5% 2 5% 3 3 3 2 4 4 52%	2200
November	1st to 10th	Day	13% 6% 2 4 2 2 3 2 4 6% 56%	2058
	11th to 20th	Day	10% 6% 2 4 3 3 2 3 5% 6% 56%	2020
	21st to end	Day	18% 7% 3 5% 3 3 4 2 4 6% 46%	1848
December	1st to 10th	Day	18% 8% 3 5% 4 3 3 2 3 4 47%	2690
	11th to 20th	Day	16% 10% 3 7% 4 3 3 3 3 4 44%	3088
	21st to end	Day	18% 7% 3 7% 4 4 4 3 4 5% 40%	4465
January	1st to 10th	Night	17% 7% 2 5% 3 3 3 3 5% 6% 46%	7634
	11th to 20th	Night	10% 4 1 4 3 2 3 2 3 4 64%	7680
	21st to end	Night	22% 8% 2 6% 3 3 3 2 3 4 45%	8402
February	1st to 10th	Night	20% 8% 3 5% 4 4 3 2 4 5% 43%	2730
	11th to 20th	Night	18% 9% 3 5% 4 3 3 2 3 5% 45%	2517
	21st to end	Night	17% 7% 2 4 4 2 4 3 4 5% 48%	2045
March	1st to 10th	Night	18% 7% 2 6% 4 4 3 3 4 5% 44%	5029
	11th to 20th	Night	10% 6% 2 6% 4 3 3 3 4 6% 52%	5090
	21st to end	Night	11% 7% 3 7% 4 3 4 3 5% 8% 46%	5574
April	1st to 10th	Night	13% 5% 2 5% 3 4 3 3 5% 7% 50%	2100
	11th to 20th	Night	12% 4 1 5% 4 4 3 3 6% 8% 50%	2075
	21st to end	Night	13% 6% 3 7% 3 3 3 4 4 8% 46%	2100
May	1st to 10th	Night	17% 8% 3 6% 4 5% 4 4 5% 7% 36%	4590
	11th to 20th	Night	16% 9% 4 7% 4 4 4 4 5% 6% 36%	4164
	21st to end	Night	16% 7% 3 7% 5% 4 5% 3 5% 6% 39%	4443
June	1st to 10th	Night	5% 4 1 4 4 3 5% 4 7% 10% 54%	1625
	11th to 20th	Night	4 4 2 5% 4 3 4 4 6% 7% 58%	1600
	21st to end	Night	3 3 1 3 4 3 4 4 7% 9% 60%	1751
July	1st to 10th	Night	6% 5% 3 7% 5% 5% 6% 4 7% 9% 42%	4078
	11th to 20th	Night	4 3 1 4 3 4 4 4 6% 12% 55%	4077
	21st to end	Night	5% 6% 2 7% 4 4 5% 4 6% 10% 48%	4449
August	1st to 10th	Night	2 1 1 3 3 3 3 3 4 9% 68%	2926
	11th to 20th	Night	4 2 2 5% 3 4 5% 4 7% 10% 55%	3188
	21st to end	Night	3 3 1 4 4 4 4 4 6% 10% 56%	3586
September	1st to 10th	Night	7% 4 2 5% 4 4 4 3 5% 7% 56%	2000
	11th to 20th	Night	10% 5% 2 5% 3 3 4 3 5% 8% 52%	2000
	21st to end	Night	9% 3 1 4 3 3 3 3 5% 7% 58%	2283
October	1st to 10th	Night	7% 4 1 5% 3 3 3 2 4 6% 61%	2400
	11th to 20th	Night	9% 4 1 5% 3 2 3 2 4 5% 62%	2400
	21st to end	Night	16% 5% 1 5% 4 3 3 2 3 3 54%	2640
November	1st to 10th	Night	12% 5% 2 5% 3 3 3 2 4 5% 56%	2460
	11th to 20th	Night	11% 4 1 4 3 3 2 3 4 6% 58%	2596
	21st to end	Night	14% 6% 2 5% 5% 3 4 2 4 6% 51%	2767
December	1st to 10th	Night	15% 7% 2 5% 3 3 3 3 4 5% 50%	4720
	11th to 20th	Night	16% 10% 3 7% 4 3 3 2 3 3 46%	5339
	21st to end	Night	18% 7% 3 6% 4 3 4 3 4 5% 43%	6747

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	43% 1 8% 29% 16% 2	5290
	11th to 20th	Day	35% 2 6% 21% 31% 5%	5310
	21st to end	Day	42% 1 4 18% 26% 8%	5812
February	1st to 10th	Day	47% 2 9% 23% 16% 3	1890
	11th to 20th	Day	47% 2 7% 20% 19% 5%	1996
	21st to end	Day	48% 3 6% 16% 19% 9%	1777
March	1st to 10th	Day	51% 2 5% 16% 16% 11%	5046
	11th to 20th	Day	34% 2 6% 20% 25% 12%	5090
	21st to end	Day	43% 2 8% 25% 20% 1	5585
April	1st to 10th	Day	39% 3 9% 24% 20% 5%	2520
	11th to 20th	Day	42% 2 9% 23% 17% 7%	2494
	21st to end	Day	45% 3 9% 22% 18% 2	2520
May	1st to 10th	Day	48% 3 9% 25% 13% 1	5560
	11th to 20th	Day	44% 3 12% 24% 15% 1	5868
	21st to end	Day	49% 3 11% 20% 14% 2	6447
June	1st to 10th	Day	36% 4 14% 26% 18% 2	2765
	11th to 20th	Day	31% 6% 13% 31% 18% 2	2800
	21st to end	Day	28% 5% 13% 30% 20% 4	2636
July	1st to 10th	Day	37% 6% 15% 29% 12% 1	5836
	11th to 20th	Day	25% 5% 15% 36% 17% 2	5831
	21st to end	Day	39% 5% 15% 29% 13% 1	6240
August	1st to 10th	Day	20% 3 15% 32% 24% 6%	4220
	11th to 20th	Day	37% 4 14% 32% 11% 1	3894
	21st to end	Day	30% 5% 12% 30% 20% 3	4311
September	1st to 10th	Day	37% 4 11% 22% 19% 8%	2400
	11th to 20th	Day	37% 4 11% 19% 24% 5%	2400
	21st to end	Day	33% 4 7% 21% 26% 8%	2090
October	1st to 10th	Day	16% 2 5% 14% 35% 28%	3260
	11th to 20th	Day	19% 1 3 20% 39% 18%	3240
	21st to end	Day	32% 2 4 28% 28% 6%	3538
November	1st to 10th	Day	32% 2 7% 27% 24% 8%	2058
	11th to 20th	Day	30% 2 8% 23% 27% 10%	2020
	21st to end	Day	43% 2 6% 20% 24% 5%	1848
December	1st to 10th	Day	44% 1 6% 26% 20% 3	2690
	11th to 20th	Day	46% 2 5% 23% 21% 4	3085
	21st to end	Day	48% 1 6% 26% 16% 4	4465
January	1st to 10th	Night	41% 1 7% 30% 20% 2	7635
	11th to 20th	Night	27% 1 5% 20% 36% 10%	7680
	21st to end	Night	46% 1 6% 18% 21% 7%	8402
February	1st to 10th	Night	46% 2 6% 22% 19% 6%	2730
	11th to 20th	Night	45% 1 6% 21% 20% 6%	2518
	21st to end	Night	41% 1 7% 18% 23% 10%	2045
March	1st to 10th	Night	44% 2 7% 15% 20% 13%	5029
	11th to 20th	Night	35% 2 6% 24% 18% 14%	5090
	21st to end	Night	40% 1 8% 26% 22% 3	5574
April	1st to 10th	Night	35% 3 9% 25% 20% 8%	2100
	11th to 20th	Night	34% 3 8% 24% 21% 10%	2075
	21st to end	Night	38% 3 10% 25% 22% 3	2100
May	1st to 10th	Night	49% 3 11% 23% 13% 2	4620
	11th to 20th	Night	49% 3 11% 23% 12% 1	4165
	21st to end	Night	47% 3 12% 20% 13% 4	4452
June	1st to 10th	Night	25% 5% 14% 32% 22% 2	1625
	11th to 20th	Night	26% 3 12% 30% 25% 4	1600
	21st to end	Night	21% 4 13% 32% 24% 7%	1751
July	1st to 10th	Night	36% 5% 14% 27% 15% 1	4035
	11th to 20th	Night	21% 5% 16% 37% 18% 3	4026
	21st to end	Night	32% 4 15% 30% 18%	4320
August	1st to 10th	Night	15% 3 15% 35% 26% 6%	2916
	11th to 20th	Night	23% 4 19% 37% 16% 2	3218
	21st to end	Night	24% 5% 11% 31% 27% 3	3586
September	1st to 10th	Night	29% 4 10% 26% 22% 9%	2000
	11th to 20th	Night	32% 3 10% 23% 26% 6%	2000
	21st to end	Night	27% 3 9% 22% 29% 10%	2283
October	1st to 10th	Night	17% 2 6% 15% 29% 31%	3920
	11th to 20th	Night	17% 2 3 16% 39% 24%	3899
	21st to end	Night	30% 2 4 22% 30% 13%	4252
November	1st to 10th	Night	32% 2 6% 23% 26% 11%	2460
	11th to 20th	Night	29% 2 6% 25% 27% 11%	2596
	21st to end	Night	37% 2 7% 21% 28% 6%	2767
December	1st to 10th	Night	38% 2 7% 31% 18% 4	4720
	11th to 20th	Night	46% 1 4 21% 21% 6%	5341
	21st to end	Night	46% 1 8% 24% 18% 3	6747

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	26% 15% 37% 16% 5% 1	330
	11th to 20th	Day	25% 21% 38% 14% 2	330
	21st to end	Day	21% 22% 39% 13% 5%	363
February	1st to 10th	Day	28% 15% 35% 16% 6%	330
	11th to 20th	Day	30% 23% 33% 11% 3 1	330
	21st to end	Day	32% 20% 30% 14% 3	273
March	1st to 10th	Day	29% 16% 36% 14% 5%	330
	11th to 20th	Day	25% 23% 39% 12% 1	330
	21st to end	Day	24% 20% 39% 14% 2	363
April	1st to 10th	Day	23% 16% 31% 24% 6% 1	540
	11th to 20th	Day	23% 16% 34% 20% 8%	532
	21st to end	Day	22% 13% 33% 21% 9% 2	540
May	1st to 10th	Day	22% 11% 32% 26% 8% 1	543
	11th to 20th	Day	16% 6% 30% 29% 17% 3	718
	21st to end	Day	12% 6% 24% 33% 20% 6%	789
June	1st to 10th	Day	12% 3 18% 33% 25% 7%	730
	11th to 20th	Day	7% 3 18% 36% 28% 8%	730
	21st to end	Day	5% 3 18% 37% 28% 9%	730
July	1st to 10th	Day	6% 3 12% 30% 36% 12%	721
	11th to 20th	Day	6% 2 11% 33% 36% 13%	718
	21st to end	Day	8% 2 7% 35% 33% 15%	794
August	1st to 10th	Day	7% 2 12% 35% 35% 10%	726
	11th to 20th	Day	14% 2 7% 32% 31% 14%	528
	21st to end	Day	11% 1 6% 28% 38% 16%	583
September	1st to 10th	Day	11% 2 10% 28% 38% 11%	530
	11th to 20th	Day	13% 2 13% 24% 37% 11%	530
	21st to end	Day	13% 4 19% 35% 20% 8%	345
October	1st to 10th	Day	7% 5% 27% 37% 20% 4	330
	11th to 20th	Day	14% 10% 35% 26% 15% 2	330
	21st to end	Day	27% 10% 33% 20% 9% 1	363
November	1st to 10th	Day	19% 10% 34% 24% 11% 2	330
	11th to 20th	Day	13% 15% 39% 26% 6% 1	330
	21st to end	Day	27% 15% 29% 21% 7% 1	330
December	1st to 10th	Day	24% 19% 33% 16% 6% 1	330
	11th to 20th	Day	25% 15% 32% 18% 9%	330
	21st to end	Day	28% 16% 36% 16% 3 1	363
January	1st to 10th	Night	23% 10% 34% 28% 6%	1050
	11th to 20th	Night	21% 14% 35% 26% 4	1050
	21st to end	Night	22% 12% 36% 27% 3	1155
February	1st to 10th	Night	25% 13% 31% 27% 5%	1050
	11th to 20th	Night	26% 12% 38% 23% 2	882
	21st to end	Night	24% 17% 32% 25% 2	661
March	1st to 10th	Night	21% 10% 33% 31% 4	630
	11th to 20th	Night	20% 13% 36% 25% 5%	630
	21st to end	Night	18% 11% 35% 29% 7%	693
April	1st to 10th	Night	17% 13% 35% 28% 7%	630
	11th to 20th	Night	14% 11% 37% 27% 10%	623
	21st to end	Night	17% 8% 36% 28% 10% 1	630
May	1st to 10th	Night	14% 5% 29% 42% 10%	630
	11th to 20th	Night	17% 5% 29% 31% 17% 2	609
	21st to end	Night	11% 5% 23% 33% 24% 4	650
June	1st to 10th	Night	6% 2 13% 41% 33% 4	600
	11th to 20th	Night	5% 2 13% 45% 32% 4	600
	21st to end	Night	4 1 12% 41% 37% 5%	600
July	1st to 10th	Night	4 2 8% 35% 43% 8%	585
	11th to 20th	Night	4 1 7% 36% 43% 8%	582
	21st to end	Night	4 1 7% 37% 41% 10%	657
August	1st to 10th	Night	4 1 6% 39% 44% 6%	597
	11th to 20th	Night	6% 1 7% 37% 40% 8%	594
	21st to end	Night	7% 2 8% 32% 45% 6%	660
September	1st to 10th	Night	9% 1 8% 37% 40% 6%	600
	11th to 20th	Night	12% 2 10% 32% 40% 4	600
	21st to end	Night	10% 2 14% 37% 33% 4	703
October	1st to 10th	Night	10% 2 17% 35% 33% 3	800
	11th to 20th	Night	11% 5% 26% 39% 19% 1	800
	21st to end	Night	20% 7% 27% 31% 14% 1	880
November	1st to 10th	Night	15% 7% 24% 37% 16% 1	820
	11th to 20th	Night	14% 9% 28% 38% 11%	840
	21st to end	Night	16% 12% 29% 31% 11% 1	877
December	1st to 10th	Night	21% 7% 32% 33% 6%	1050
	11th to 20th	Night	23% 10% 29% 31% 7%	1050
	21st to end	Night	24% 12% 28% 30% 6%	1155

Page generated at 2026-05-14 00:58:59. Version ac07

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