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 2025-01-22.

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	13% 6% 2 6% 4 4 4 3 5% 7% 45%	104539
	Night	13% 6% 2 5% 4 3 3 3 5% 6% 50%	104884
Transparency	Day	38% 3 9% 25% 20% 5%	108184
	Night	35% 2 9% 24% 23% 7%	109380
Seeing	Day	16% 9% 23% 26% 20% 6%	15587
	Night	15% 7% 25% 32% 18% 2	25494

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	17% 8% 3 7% 3 3 2 2 4 5% 45%	2937
	11th to 20th	Day	12% 9% 3 6% 4 4 3 2 3 4 50%	2940
	21st to end	Day	25% 7% 2 4 3 2 2 2 3 4 46%	3144
February	1st to 10th	Day	22% 8% 2 5% 4 2 3 3 3 5% 42%	1710
	11th to 20th	Day	18% 8% 3 6% 4 4 3 3 4 5% 42%	1792
	21st to end	Day	22% 9% 2 7% 4 4 3 3 4 5% 37%	1613
March	1st to 10th	Day	19% 10% 3 7% 4 4 4 2 4 5% 38%	3436
	11th to 20th	Day	13% 7% 3 6% 4 4 4 3 4 6% 45%	3480
	21st to end	Day	16% 8% 3 6% 5% 4 3 3 4 5% 43%	3814
April	1st to 10th	Day	14% 6% 2 6% 4 3 4 4 5% 7% 45%	2280
	11th to 20th	Day	15% 7% 2 7% 4 3 4 3 4 7% 45%	2254
	21st to end	Day	15% 6% 2 6% 5% 4 4 3 5% 7% 41%	2280
May	1st to 10th	Day	16% 7% 3 7% 5% 4 4 4 5% 6% 38%	3765
	11th to 20th	Day	11% 5% 2 6% 5% 4 5% 5% 6% 8% 42%	4035
	21st to end	Day	11% 7% 3 8% 6% 5% 6% 4 6% 8% 34%	4477
June	1st to 10th	Day	9% 6% 2 5% 5% 5% 6% 5% 7% 8% 43%	2627
	11th to 20th	Day	5% 4 1 5% 5% 5% 5% 5% 7% 10% 48%	2660
	21st to end	Day	4 4 2 5% 4 4 6% 5% 7% 11% 48%	2505
July	1st to 10th	Day	8% 5% 2 6% 5% 5% 5% 5% 9% 10% 40%	4120
	11th to 20th	Day	5% 4 2 4 4 4 5% 4 6% 9% 53%	4120
	21st to end	Day	11% 8% 4 8% 5% 6% 5% 5% 7% 8% 32%	4465
August	1st to 10th	Day	4 3 1 3 3 3 4 4 6% 9% 60%	4104
	11th to 20th	Day	9% 5% 3 7% 4 5% 5% 5% 7% 10% 41%	3738
	21st to end	Day	5% 4 1 5% 4 5% 5% 4 7% 8% 52%	4180
September	1st to 10th	Day	11% 6% 2 5% 5% 4 4 3 6% 7% 46%	2280
	11th to 20th	Day	14% 6% 2 4 3 3 5% 4 6% 6% 46%	2280
	21st to end	Day	10% 4 2 5% 4 4 4 3 5% 5% 54%	1985
October	1st to 10th	Day	7% 5% 2 5% 3 4 3 2 5% 7% 59%	1900
	11th to 20th	Day	14% 4 2 4 2 2 2 2 4 5% 57%	1900
	21st to end	Day	18% 4 1 4 2 3 3 2 4 4 53%	2090
November	1st to 10th	Day	14% 6% 2 4 2 2 3 2 4 6% 56%	1958
	11th to 20th	Day	10% 6% 2 4 3 2 2 3 5% 7% 55%	1924
	21st to end	Day	18% 7% 3 5% 3 3 4 2 4 5% 46%	1760
December	1st to 10th	Day	18% 8% 3 5% 4 3 3 2 3 4 47%	2610
	11th to 20th	Day	17% 10% 3 7% 4 3 3 3 3 4 43%	3008
	21st to end	Day	18% 7% 3 7% 4 4 4 3 4 5% 40%	4368
January	1st to 10th	Night	16% 7% 3 7% 4 4 3 3 4 4 46%	4238
	11th to 20th	Night	16% 6% 1 4 3 3 3 3 3 4 54%	4250
	21st to end	Night	24% 7% 2 4 2 3 3 2 3 4 47%	4546
February	1st to 10th	Night	20% 8% 3 5% 4 4 3 3 5% 5% 42%	2470
	11th to 20th	Night	17% 9% 3 5% 4 3 3 2 3 5% 46%	2272
	21st to end	Night	19% 7% 3 4 4 2 4 3 4 5% 46%	1856
March	1st to 10th	Night	19% 8% 2 6% 3 4 3 4 5% 5% 41%	3419
	11th to 20th	Night	14% 7% 2 6% 4 3 3 2 4 5% 50%	3480
	21st to end	Night	11% 7% 3 7% 5% 4 4 3 5% 7% 44%	3803
April	1st to 10th	Night	12% 5% 2 5% 3 4 3 3 5% 7% 50%	1900
	11th to 20th	Night	12% 4 1 5% 4 4 3 3 6% 8% 50%	1875
	21st to end	Night	13% 6% 3 6% 3 3 3 3 4 8% 47%	1900
May	1st to 10th	Night	16% 7% 3 6% 4 4 4 3 5% 8% 39%	3130
	11th to 20th	Night	13% 7% 3 6% 3 3 4 4 5% 7% 45%	2865
	21st to end	Night	13% 6% 3 7% 5% 5% 5% 3 6% 7% 41%	3090
June	1st to 10th	Night	5% 4 1 5% 4 3 5% 4 7% 10% 53%	1544
	11th to 20th	Night	3 4 2 4 4 3 3 4 6% 7% 61%	1520
	21st to end	Night	3 3 1 3 4 3 4 3 6% 9% 61%	1663
July	1st to 10th	Night	7% 4 2 5% 5% 5% 5% 4 6% 9% 49%	2850
	11th to 20th	Night	5% 3 2 4 3 4 4 4 5% 11% 56%	2850
	21st to end	Night	8% 7% 2 9% 4 4 5% 4 6% 9% 42%	3098
August	1st to 10th	Night	2 1 1 3 3 3 3 2 4 9% 68%	2836
	11th to 20th	Night	4 3 2 4 3 4 5% 4 7% 10% 56%	3088
	21st to end	Night	3 3 1 4 4 4 4 4 7% 10% 57%	3476
September	1st to 10th	Night	7% 4 2 5% 4 4 4 3 5% 7% 56%	1900
	11th to 20th	Night	10% 5% 2 5% 3 3 4 3 5% 7% 53%	1900
	21st to end	Night	9% 3 1 4 3 3 3 3 5% 7% 58%	2169
October	1st to 10th	Night	8% 4 1 4 3 3 3 2 4 7% 61%	2280
	11th to 20th	Night	10% 4 1 5% 3 2 2 2 4 5% 62%	2280
	21st to end	Night	16% 5% 1 5% 4 3 3 2 3 4 55%	2508
November	1st to 10th	Night	12% 5% 2 5% 3 3 3 2 4 5% 56%	2340
	11th to 20th	Night	11% 4 1 4 3 3 2 3 4 6% 58%	2472
	21st to end	Night	13% 5% 2 5% 5% 3 4 2 4 6% 51%	2635
December	1st to 10th	Night	16% 7% 2 5% 3 3 3 3 4 5% 51%	4580
	11th to 20th	Night	16% 10% 3 7% 4 3 3 2 3 3 45%	5199
	21st to end	Night	18% 7% 3 6% 4 3 4 3 4 5% 43%	6602

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	45% 1 4 26% 20% 3	2938
	11th to 20th	Day	41% 2 9% 24% 22% 3	2940
	21st to end	Day	45% 1 5% 18% 24% 5%	3144
February	1st to 10th	Day	47% 2 9% 22% 16% 4	1710
	11th to 20th	Day	46% 3 6% 20% 20% 5%	1802
	21st to end	Day	51% 3 6% 16% 16% 8%	1613
March	1st to 10th	Day	51% 1 6% 14% 18% 9%	3436
	11th to 20th	Day	42% 2 8% 25% 20% 4	3480
	21st to end	Day	46% 1 8% 23% 20% 2	3814
April	1st to 10th	Day	39% 4 9% 24% 20% 5%	2280
	11th to 20th	Day	42% 2 8% 23% 17% 7%	2254
	21st to end	Day	44% 3 9% 23% 20% 2	2280
May	1st to 10th	Day	47% 3 10% 24% 14% 2	3800
	11th to 20th	Day	40% 3 13% 28% 15% 1	4039
	21st to end	Day	48% 3 11% 24% 12% 2	4489
June	1st to 10th	Day	37% 4 13% 27% 17% 2	2627
	11th to 20th	Day	29% 5% 13% 31% 19% 2	2660
	21st to end	Day	29% 5% 12% 30% 21% 4	2505
July	1st to 10th	Day	35% 5% 15% 32% 12% 1	4056
	11th to 20th	Day	27% 4 9% 34% 23% 3	4051
	21st to end	Day	47% 5% 15% 24% 9%	4325
August	1st to 10th	Day	20% 4 16% 31% 24% 6%	4090
	11th to 20th	Day	38% 4 14% 32% 12% 1	3774
	21st to end	Day	29% 5% 12% 31% 20% 3	4179
September	1st to 10th	Day	37% 3 11% 21% 19% 8%	2280
	11th to 20th	Day	38% 4 11% 18% 25% 6%	2280
	21st to end	Day	33% 4 7% 22% 26% 9%	1985
October	1st to 10th	Day	16% 2 5% 13% 35% 28%	3160
	11th to 20th	Day	19% 1 3 20% 38% 18%	3140
	21st to end	Day	31% 2 4 28% 28% 6%	3428
November	1st to 10th	Day	32% 2 7% 26% 24% 8%	1958
	11th to 20th	Day	30% 2 8% 22% 28% 10%	1924
	21st to end	Day	43% 2 5% 19% 24% 6%	1760
December	1st to 10th	Day	44% 1 6% 26% 19% 3	2610
	11th to 20th	Day	46% 2 5% 23% 20% 5%	3005
	21st to end	Day	48% 1 6% 26% 15% 4	4368
January	1st to 10th	Night	43% 1 5% 21% 28% 3	4238
	11th to 20th	Night	37% 1 8% 22% 26% 4	4250
	21st to end	Night	44% 1 9% 19% 23% 4	4546
February	1st to 10th	Night	46% 2 7% 20% 19% 6%	2470
	11th to 20th	Night	44% 2 6% 21% 21% 7%	2273
	21st to end	Night	43% 1 7% 18% 21% 9%	1856
March	1st to 10th	Night	46% 1 8% 14% 19% 11%	3419
	11th to 20th	Night	39% 2 7% 27% 19% 6%	3480
	21st to end	Night	42% 1 8% 25% 23% 2	3803
April	1st to 10th	Night	34% 3 9% 24% 21% 9%	1900
	11th to 20th	Night	34% 3 8% 24% 22% 10%	1875
	21st to end	Night	36% 3 10% 25% 23% 4	1900
May	1st to 10th	Night	46% 3 10% 24% 14% 3	3160
	11th to 20th	Night	41% 2 13% 28% 16% 1	2866
	21st to end	Night	43% 3 14% 23% 14% 2	3099
June	1st to 10th	Night	26% 5% 14% 33% 21% 2	1544
	11th to 20th	Night	23% 3 12% 32% 26% 4	1520
	21st to end	Night	21% 4 13% 31% 24% 7%	1663
July	1st to 10th	Night	31% 5% 17% 29% 17% 1	2805
	11th to 20th	Night	22% 4 12% 34% 24% 4	2796
	21st to end	Night	41% 5% 12% 26% 15%	2999
August	1st to 10th	Night	15% 2 15% 35% 26% 6%	2826
	11th to 20th	Night	23% 4 19% 36% 16% 2	3118
	21st to end	Night	24% 5% 11% 31% 27% 3	3476
September	1st to 10th	Night	28% 4 10% 26% 22% 9%	1900
	11th to 20th	Night	32% 3 10% 22% 27% 7%	1900
	21st to end	Night	27% 3 9% 22% 29% 10%	2169
October	1st to 10th	Night	17% 2 6% 15% 29% 31%	3800
	11th to 20th	Night	17% 1 3 16% 38% 24%	3779
	21st to end	Night	29% 2 4 22% 30% 13%	4120
November	1st to 10th	Night	32% 2 6% 23% 26% 11%	2340
	11th to 20th	Night	29% 2 5% 24% 28% 12%	2472
	21st to end	Night	36% 2 7% 20% 29% 6%	2635
December	1st to 10th	Night	38% 2 6% 32% 18% 4	4580
	11th to 20th	Night	46% 1 4 21% 21% 6%	5201
	21st to end	Night	46% 1 8% 24% 18% 3	6602

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% 38% 15% 5% 1	300
	11th to 20th	Day	26% 21% 35% 15% 2	300
	21st to end	Day	23% 21% 37% 13% 6%	300
February	1st to 10th	Day	28% 15% 36% 16% 6%	270
	11th to 20th	Day	30% 23% 32% 11% 3 1	270
	21st to end	Day	37% 20% 28% 12% 2	225
March	1st to 10th	Day	26% 17% 36% 14% 6%	270
	11th to 20th	Day	25% 22% 39% 13% 1	270
	21st to end	Day	26% 21% 37% 13% 3	297
April	1st to 10th	Day	21% 17% 32% 22% 6% 1	460
	11th to 20th	Day	23% 14% 34% 20% 8%	452
	21st to end	Day	23% 13% 33% 20% 10% 2	460
May	1st to 10th	Day	21% 11% 32% 26% 9% 1	463
	11th to 20th	Day	16% 5% 29% 31% 17% 3	641
	21st to end	Day	11% 6% 23% 33% 21% 6%	734
June	1st to 10th	Day	12% 3 18% 33% 26% 8%	680
	11th to 20th	Day	6% 3 16% 38% 29% 8%	680
	21st to end	Day	5% 3 19% 38% 26% 9%	680
July	1st to 10th	Day	7% 3 13% 31% 35% 12%	671
	11th to 20th	Day	6% 2 11% 31% 36% 13%	668
	21st to end	Day	8% 2 8% 35% 32% 15%	739
August	1st to 10th	Day	8% 2 12% 34% 34% 10%	676
	11th to 20th	Day	15% 2 8% 34% 31% 11%	488
	21st to end	Day	11% 1 5% 27% 39% 17%	539
September	1st to 10th	Day	11% 2 10% 29% 38% 11%	490
	11th to 20th	Day	14% 2 13% 26% 36% 10%	490
	21st to end	Day	13% 4 19% 36% 19% 8%	314
October	1st to 10th	Day	7% 5% 27% 37% 20% 4	300
	11th to 20th	Day	15% 10% 36% 25% 13% 1	300
	21st to end	Day	26% 10% 34% 20% 10% 2	330
November	1st to 10th	Day	20% 10% 33% 23% 11% 2	300
	11th to 20th	Day	12% 15% 41% 25% 6% 1	300
	21st to end	Day	28% 15% 27% 21% 7% 1	300
December	1st to 10th	Day	24% 20% 32% 16% 7% 1	300
	11th to 20th	Day	25% 15% 32% 18% 9%	300
	21st to end	Day	28% 16% 36% 15% 3 1	330
January	1st to 10th	Night	23% 10% 34% 28% 6%	1000
	11th to 20th	Night	22% 15% 33% 26% 5%	1000
	21st to end	Night	21% 13% 36% 27% 4	1051
February	1st to 10th	Night	25% 14% 30% 26% 5%	950
	11th to 20th	Night	24% 11% 39% 24% 2	797
	21st to end	Night	26% 17% 32% 23% 3	600
March	1st to 10th	Night	21% 9% 33% 33% 5%	570
	11th to 20th	Night	20% 13% 36% 25% 6%	570
	21st to end	Night	18% 12% 35% 28% 7%	627
April	1st to 10th	Night	16% 14% 35% 28% 7%	570
	11th to 20th	Night	15% 10% 37% 26% 11%	563
	21st to end	Night	16% 9% 37% 28% 10% 1	570
May	1st to 10th	Night	14% 5% 28% 42% 11%	570
	11th to 20th	Night	17% 4 28% 31% 18% 2	561
	21st to end	Night	9% 5% 22% 34% 25% 5%	617
June	1st to 10th	Night	6% 2 12% 41% 34% 4	570
	11th to 20th	Night	4 1 13% 46% 33% 4	570
	21st to end	Night	5% 1 12% 42% 36% 5%	570
July	1st to 10th	Night	4 2 9% 35% 43% 7%	555
	11th to 20th	Night	4 1 8% 36% 43% 8%	552
	21st to end	Night	4 1 7% 36% 42% 9%	624
August	1st to 10th	Night	5% 1 5% 38% 45% 6%	567
	11th to 20th	Night	7% 1 7% 38% 40% 7%	564
	21st to end	Night	6% 2 8% 32% 46% 6%	627
September	1st to 10th	Night	9% 1 8% 37% 40% 6%	570
	11th to 20th	Night	12% 2 10% 33% 39% 3	570
	21st to end	Night	9% 2 15% 37% 33% 4	668
October	1st to 10th	Night	11% 2 17% 33% 33% 3	760
	11th to 20th	Night	11% 5% 27% 38% 18% 1	760
	21st to end	Night	19% 6% 27% 31% 15% 1	836
November	1st to 10th	Night	15% 7% 24% 37% 17% 1	780
	11th to 20th	Night	14% 9% 28% 38% 11%	800
	21st to end	Night	16% 12% 28% 32% 11% 1	835
December	1st to 10th	Night	22% 7% 31% 33% 7%	1000
	11th to 20th	Night	23% 10% 28% 31% 8%	1000
	21st to end	Night	24% 12% 28% 30% 6%	1100

Page generated at 2025-01-19 02:06:49. Version ac07

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