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 2024-01-27.

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	13% 5% 2 5% 5% 3 5% 5% 5% 7% 45%	74707
	Night	12% 5% 2 5% 4 3 4 4 5% 7% 51%	75332
Transparency	Day	39% 4 10% 24% 19% 5%	74431
	Night	35% 3 9% 24% 23% 6%	75129
Seeing	Day	16% 8% 23% 26% 20% 6%	14240
	Night	15% 7% 25% 32% 18% 2	24192

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	18% 8% 3 4 4 2 2 4 3 6% 46%	1707
	11th to 20th	Day	17% 7% 3 5% 5% 2 5% 4 4 5% 43%	1710
	21st to end	Day	18% 6% 2 4 4 2 3 3 4 5% 49%	1836
February	1st to 10th	Day	22% 7% 3 4 4 2 3 3 3 5% 43%	1620
	11th to 20th	Day	18% 7% 4 5% 5% 3 4 4 4 5% 41%	1695
	21st to end	Day	23% 8% 2 6% 5% 3 3 4 3 4 38%	1520
March	1st to 10th	Day	18% 7% 3 5% 4 3 3 3 4 5% 44%	1980
	11th to 20th	Day	19% 7% 3 6% 5% 3 4 4 4 5% 41%	1980
	21st to end	Day	18% 6% 4 5% 5% 3 4 4 5% 6% 39%	2178
April	1st to 10th	Day	14% 6% 2 5% 4 3 4 5% 6% 7% 45%	2160
	11th to 20th	Day	15% 6% 3 6% 4 2 4 4 4 6% 45%	2134
	21st to end	Day	15% 6% 2 6% 6% 3 4 4 5% 7% 41%	2160
May	1st to 10th	Day	17% 6% 3 6% 5% 3 5% 4 4 7% 41%	2160
	11th to 20th	Day	12% 5% 2 5% 5% 3 5% 5% 6% 9% 42%	2269
	21st to end	Day	9% 4 3 6% 6% 4 7% 7% 7% 9% 38%	2531
June	1st to 10th	Day	9% 5% 2 4 6% 4 7% 6% 7% 9% 43%	2488
	11th to 20th	Day	5% 3 2 4 5% 4 5% 7% 7% 10% 48%	2520
	21st to end	Day	4 3 2 4 5% 4 6% 7% 7% 10% 49%	2374
July	1st to 10th	Day	6% 4 3 6% 7% 4 6% 8% 9% 11% 36%	2340
	11th to 20th	Day	5% 4 2 5% 6% 4 7% 6% 7% 11% 44%	2340
	21st to end	Day	7% 4 2 5% 5% 4 6% 7% 9% 11% 41%	2546
August	1st to 10th	Day	6% 4 3 5% 6% 4 7% 7% 8% 11% 40%	2328
	11th to 20th	Day	10% 4 2 4 6% 4 5% 6% 6% 9% 43%	2134
	21st to end	Day	7% 5% 2 5% 5% 4 6% 5% 7% 9% 45%	2376
September	1st to 10th	Day	12% 5% 1 4 5% 3 4 5% 6% 7% 46%	2160
	11th to 20th	Day	13% 5% 2 4 4 3 5% 5% 6% 6% 47%	2160
	21st to end	Day	10% 4 2 4 4 3 4 4 5% 5% 55%	1882
October	1st to 10th	Day	7% 5% 2 4 3 3 4 3 5% 7% 57%	1800
	11th to 20th	Day	15% 5% 2 3 3 2 2 3 4 6% 55%	1800
	21st to end	Day	18% 4 2 4 3 2 3 3 4 5% 52%	1980
November	1st to 10th	Day	12% 5% 2 3 3 2 3 2 4 6% 58%	1858
	11th to 20th	Day	10% 6% 2 3 4 2 3 4 5% 7% 55%	1828
	21st to end	Day	19% 7% 3 5% 3 2 4 3 3 5% 46%	1672
December	1st to 10th	Day	19% 8% 3 4 4 2 3 3 3 6% 46%	1520
	11th to 20th	Day	14% 8% 4 6% 5% 3 4 4 4 4 44%	1918
	21st to end	Day	13% 8% 3 7% 7% 4 5% 5% 5% 6% 39%	3043
January	1st to 10th	Night	18% 6% 2 4 3 2 3 3 4 5% 50%	2458
	11th to 20th	Night	17% 7% 2 5% 3 2 3 3 3 4 48%	2470
	21st to end	Night	18% 5% 2 4 3 2 4 3 4 5% 51%	2665
February	1st to 10th	Night	20% 7% 3 5% 4 3 3 3 4 5% 43%	2340
	11th to 20th	Night	17% 8% 4 5% 4 2 3 3 3 5% 45%	2149
	21st to end	Night	20% 7% 3 4 4 2 3 3 4 5% 45%	1750
March	1st to 10th	Night	18% 5% 2 5% 3 3 3 4 5% 6% 47%	1980
	11th to 20th	Night	17% 8% 3 7% 5% 2 4 3 3 5% 44%	1980
	21st to end	Night	15% 7% 3 6% 5% 3 5% 3 5% 6% 44%	2177
April	1st to 10th	Night	11% 5% 2 5% 3 3 4 4 4 8% 51%	1800
	11th to 20th	Night	12% 3 2 5% 4 3 3 4 5% 8% 51%	1775
	21st to end	Night	13% 5% 3 6% 4 3 3 4 4 8% 48%	1800
May	1st to 10th	Night	14% 4 2 4 3 3 4 4 5% 8% 49%	1800
	11th to 20th	Night	12% 6% 3 5% 4 3 4 5% 5% 8% 47%	1622
	21st to end	Night	8% 3 3 6% 5% 4 6% 4 7% 8% 46%	1745
June	1st to 10th	Night	5% 4 1 4 4 2 4 5% 6% 10% 54%	1463
	11th to 20th	Night	3 3 2 4 4 2 4 5% 6% 8% 61%	1440
	21st to end	Night	4 3 1 3 4 2 3 4 6% 9% 60%	1575
July	1st to 10th	Night	3 3 2 5% 5% 4 6% 5% 7% 11% 49%	1620
	11th to 20th	Night	4 2 1 4 5% 3 5% 6% 6% 12% 51%	1620
	21st to end	Night	3 2 1 5% 4 2 5% 6% 8% 12% 53%	1772
August	1st to 10th	Night	4 2 2 4 5% 3 5% 5% 7% 12% 51%	1611
	11th to 20th	Night	7% 3 2 4 4 3 4 6% 6% 10% 51%	1764
	21st to end	Night	5% 4 2 5% 5% 3 5% 5% 6% 10% 51%	1980
September	1st to 10th	Night	7% 4 2 5% 4 3 4 4 5% 7% 57%	1800
	11th to 20th	Night	9% 5% 2 4 4 2 4 4 5% 7% 53%	1800
	21st to end	Night	9% 3 2 3 3 2 3 4 5% 7% 59%	2054
October	1st to 10th	Night	8% 4 1 4 4 3 3 3 4 7% 60%	2160
	11th to 20th	Night	11% 4 1 4 4 2 3 3 4 5% 60%	2160
	21st to end	Night	17% 5% 1 4 4 2 3 2 2 4 55%	2376
November	1st to 10th	Night	11% 4 2 3 4 2 3 3 4 5% 58%	2220
	11th to 20th	Night	11% 4 2 4 3 2 3 4 4 6% 57%	2348
	21st to end	Night	14% 5% 3 4 5% 2 4 3 4 6% 50%	2503
December	1st to 10th	Night	18% 6% 2 5% 4 3 4 4 4 5% 47%	2660
	11th to 20th	Night	16% 6% 3 5% 5% 3 3 3 3 4 49%	3279
	21st to end	Night	15% 6% 3 5% 6% 3 4 4 4 6% 44%	4616

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% 2 6% 25% 19% 6%	1708
	11th to 20th	Day	45% 3 7% 23% 20% 2	1710
	21st to end	Day	40% 2 6% 25% 22% 6%	1836
February	1st to 10th	Day	46% 3 9% 22% 16% 3	1620
	11th to 20th	Day	47% 3 6% 21% 18% 5%	1705
	21st to end	Day	51% 3 5% 16% 17% 8%	1520
March	1st to 10th	Day	44% 2 8% 17% 20% 9%	1980
	11th to 20th	Day	47% 3 7% 21% 18% 3	1980
	21st to end	Day	46% 2 10% 25% 14% 3	2178
April	1st to 10th	Day	38% 4 9% 24% 20% 4	2160
	11th to 20th	Day	41% 2 8% 24% 17% 7%	2134
	21st to end	Day	44% 3 9% 22% 20% 2	2160
May	1st to 10th	Day	44% 4 10% 20% 18% 3	2160
	11th to 20th	Day	39% 4 14% 25% 15% 1	2273
	21st to end	Day	41% 5% 14% 26% 13% 1	2531
June	1st to 10th	Day	37% 4 13% 27% 17% 2	2488
	11th to 20th	Day	29% 6% 13% 32% 19% 2	2520
	21st to end	Day	29% 5% 11% 29% 22% 5%	2374
July	1st to 10th	Day	36% 7% 16% 25% 14% 1	2276
	11th to 20th	Day	32% 6% 14% 28% 17% 4	2271
	21st to end	Day	33% 6% 18% 30% 12% 1	2405
August	1st to 10th	Day	34% 6% 17% 31% 11% 1	2314
	11th to 20th	Day	38% 5% 13% 24% 17% 2	2134
	21st to end	Day	35% 6% 14% 26% 15% 5%	2376
September	1st to 10th	Day	37% 4 11% 23% 19% 7%	2160
	11th to 20th	Day	36% 4 11% 18% 25% 6%	2160
	21st to end	Day	32% 4 7% 22% 26% 9%	1882
October	1st to 10th	Day	28% 4 9% 24% 28% 8%	1800
	11th to 20th	Day	33% 2 5% 20% 30% 10%	1800
	21st to end	Day	36% 2 5% 24% 23% 9%	1980
November	1st to 10th	Day	30% 2 8% 27% 24% 8%	1858
	11th to 20th	Day	30% 2 8% 22% 29% 9%	1828
	21st to end	Day	44% 2 5% 18% 24% 6%	1672
December	1st to 10th	Day	43% 2 8% 25% 17% 6%	1520
	11th to 20th	Day	45% 2 5% 21% 22% 5%	1915
	21st to end	Day	47% 1 7% 20% 19% 5%	3043
January	1st to 10th	Night	39% 2 7% 21% 27% 5%	2458
	11th to 20th	Night	42% 2 7% 22% 21% 5%	2470
	21st to end	Night	38% 2 5% 24% 25% 5%	2665
February	1st to 10th	Night	46% 2 7% 21% 19% 6%	2340
	11th to 20th	Night	44% 2 6% 22% 20% 6%	2150
	21st to end	Night	44% 1 6% 18% 21% 9%	1750
March	1st to 10th	Night	40% 2 8% 16% 22% 12%	1980
	11th to 20th	Night	46% 3 7% 21% 17% 6%	1980
	21st to end	Night	43% 2 9% 23% 20% 3	2177
April	1st to 10th	Night	34% 3 10% 25% 21% 8%	1800
	11th to 20th	Night	33% 3 8% 25% 22% 10%	1775
	21st to end	Night	36% 3 10% 25% 24% 3	1800
May	1st to 10th	Night	35% 5% 11% 24% 19% 6%	1800
	11th to 20th	Night	38% 3 12% 27% 18% 2	1623
	21st to end	Night	35% 5% 15% 27% 16% 1	1746
June	1st to 10th	Night	25% 5% 13% 33% 22% 2	1463
	11th to 20th	Night	23% 3 12% 33% 26% 3	1440
	21st to end	Night	21% 4 13% 30% 25% 7%	1575
July	1st to 10th	Night	28% 5% 19% 29% 17% 2	1575
	11th to 20th	Night	25% 5% 18% 29% 17% 6%	1566
	21st to end	Night	24% 7% 15% 35% 19% 1	1673
August	1st to 10th	Night	25% 4 19% 36% 14% 1	1601
	11th to 20th	Night	28% 5% 15% 29% 21% 2	1764
	21st to end	Night	29% 6% 14% 28% 19% 4	1980
September	1st to 10th	Night	28% 4 10% 26% 23% 8%	1800
	11th to 20th	Night	31% 3 10% 22% 27% 7%	1800
	21st to end	Night	25% 4 8% 23% 30% 10%	2054
October	1st to 10th	Night	27% 2 10% 25% 24% 11%	2160
	11th to 20th	Night	29% 3 5% 19% 33% 11%	2160
	21st to end	Night	37% 2 5% 19% 27% 10%	2376
November	1st to 10th	Night	30% 2 6% 24% 27% 11%	2220
	11th to 20th	Night	30% 2 5% 24% 28% 10%	2348
	21st to end	Night	38% 2 6% 20% 28% 6%	2503
December	1st to 10th	Night	42% 2 8% 20% 21% 7%	2660
	11th to 20th	Night	41% 1 5% 21% 26% 6%	3281
	21st to end	Night	44% 1 7% 22% 22% 4	4616

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	270
	11th to 20th	Day	28% 22% 34% 13% 3	270
	21st to end	Day	23% 22% 37% 13% 5%	282
February	1st to 10th	Day	27% 15% 36% 15% 6%	240
	11th to 20th	Day	32% 24% 32% 9% 3	240
	21st to end	Day	38% 15% 30% 14% 3	198
March	1st to 10th	Day	27% 17% 38% 13% 5%	240
	11th to 20th	Day	28% 21% 38% 13% 1	240
	21st to end	Day	25% 22% 35% 14% 3	264
April	1st to 10th	Day	20% 16% 33% 24% 7% 1	420
	11th to 20th	Day	23% 12% 33% 22% 9%	412
	21st to end	Day	22% 13% 33% 20% 10% 1	420
May	1st to 10th	Day	21% 10% 32% 26% 10% 1	423
	11th to 20th	Day	16% 5% 28% 31% 17% 3	592
	21st to end	Day	11% 5% 21% 34% 22% 6%	679
June	1st to 10th	Day	12% 3 17% 33% 27% 8%	630
	11th to 20th	Day	5% 3 17% 37% 30% 8%	630
	21st to end	Day	5% 3 19% 37% 26% 10%	630
July	1st to 10th	Day	6% 3 13% 30% 35% 13%	621
	11th to 20th	Day	6% 3 11% 30% 37% 13%	618
	21st to end	Day	7% 2 7% 34% 34% 16%	684
August	1st to 10th	Day	8% 2 12% 33% 35% 10%	626
	11th to 20th	Day	16% 2 6% 33% 31% 12%	448
	21st to end	Day	12% 1 5% 25% 41% 16%	495
September	1st to 10th	Day	11% 1 9% 27% 41% 11%	450
	11th to 20th	Day	12% 2 13% 26% 37% 10%	450
	21st to end	Day	13% 3 17% 38% 20% 9%	284
October	1st to 10th	Day	8% 6% 29% 35% 19% 4	270
	11th to 20th	Day	16% 11% 37% 25% 10% 1	270
	21st to end	Day	27% 10% 34% 18% 9% 2	297
November	1st to 10th	Day	17% 9% 34% 25% 13% 2	270
	11th to 20th	Day	12% 14% 41% 26% 6% 1	270
	21st to end	Day	30% 14% 25% 23% 7% 1	270
December	1st to 10th	Day	23% 20% 31% 17% 7% 1	270
	11th to 20th	Day	26% 14% 31% 19% 10%	270
	21st to end	Day	27% 16% 39% 15% 3 1	297
January	1st to 10th	Night	23% 10% 34% 27% 6%	950
	11th to 20th	Night	22% 15% 33% 25% 5%	950
	21st to end	Night	22% 13% 35% 27% 4	1025
February	1st to 10th	Night	25% 13% 31% 26% 5%	900
	11th to 20th	Night	24% 11% 39% 24% 2	754
	21st to end	Night	26% 16% 32% 23% 3	566
March	1st to 10th	Night	21% 9% 32% 34% 4	540
	11th to 20th	Night	20% 13% 35% 25% 6%	540
	21st to end	Night	19% 12% 34% 28% 7%	594
April	1st to 10th	Night	15% 14% 35% 29% 8%	540
	11th to 20th	Night	14% 10% 37% 27% 12%	533
	21st to end	Night	16% 8% 38% 28% 10% 1	540
May	1st to 10th	Night	14% 5% 29% 41% 11%	540
	11th to 20th	Night	17% 4 28% 30% 18% 2	531
	21st to end	Night	9% 4 21% 35% 26% 5%	584
June	1st to 10th	Night	6% 2 13% 39% 36% 4	540
	11th to 20th	Night	4 1 12% 46% 33% 4	540
	21st to end	Night	5% 1 12% 42% 35% 5%	540
July	1st to 10th	Night	3 2 8% 34% 45% 8%	525
	11th to 20th	Night	4 1 8% 35% 44% 9%	522
	21st to end	Night	4 1 7% 35% 42% 10%	591
August	1st to 10th	Night	5% 1 5% 39% 45% 6%	537
	11th to 20th	Night	7% 1 7% 37% 41% 8%	534
	21st to end	Night	6% 2 8% 31% 47% 6%	594
September	1st to 10th	Night	9% 1 7% 36% 41% 6%	540
	11th to 20th	Night	11% 2 10% 33% 41% 3	540
	21st to end	Night	9% 2 14% 37% 34% 4	632
October	1st to 10th	Night	11% 2 18% 33% 32% 3	720
	11th to 20th	Night	12% 5% 28% 37% 17% 1	720
	21st to end	Night	20% 6% 27% 30% 15% 1	792
November	1st to 10th	Night	14% 6% 24% 38% 18% 1	740
	11th to 20th	Night	14% 9% 28% 38% 12%	760
	21st to end	Night	17% 11% 28% 32% 11% 1	793
December	1st to 10th	Night	22% 7% 31% 33% 7%	950
	11th to 20th	Night	23% 10% 28% 31% 8%	950
	21st to end	Night	23% 12% 29% 30% 6%	1045

Page generated at 2024-01-24 08:37:31. Version ac07

Copyright 2024 Attilla Danko