Jonesboro
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Jonesboro clear sky chart from 2005-11-06 to 2026-06-16.

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%	137083
	Night	14% 6% 2 5% 4 3 4 3 5% 7% 49%	135181
Transparency	Day	36% 6% 10% 25% 19% 4	140682
	Night	35% 5% 10% 24% 21% 6%	139662
Seeing	Day	14% 7% 22% 26% 21% 10%	17553
	Night	15% 6% 26% 33% 18% 2	27367

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 8% 4 4 3 2 4 5% 44%	5028
	11th to 20th	Day	11% 6% 2 5% 3 3 3 2 3 4 56%	5310
	21st to end	Day	20% 6% 2 5% 3 2 3 2 4 4 49%	5812
February	1st to 10th	Day	20% 7% 2 6% 4 4 4 4 4 6% 39%	1938
	11th to 20th	Day	17% 9% 2 7% 5% 4 3 3 5% 7% 39%	2048
	21st to end	Day	20% 8% 2 7% 5% 4 3 3 5% 5% 38%	1730
March	1st to 10th	Day	18% 11% 3 7% 4 4 4 3 4 5% 36%	4783
	11th to 20th	Day	11% 5% 2 5% 4 4 4 3 4 6% 54%	5090
	21st to end	Day	14% 7% 2 7% 5% 4 4 3 5% 7% 42%	5817
April	1st to 10th	Day	13% 7% 3 6% 4 3 3 3 5% 7% 46%	2520
	11th to 20th	Day	14% 7% 2 6% 4 4 4 3 6% 7% 44%	2494
	21st to end	Day	15% 7% 2 7% 4 4 3 4 6% 8% 39%	2520
May	1st to 10th	Day	14% 7% 3 7% 5% 5% 5% 4 7% 8% 37%	7021
	11th to 20th	Day	13% 5% 3 7% 5% 5% 5% 5% 7% 9% 37%	7459
	21st to end	Day	19% 8% 3 7% 5% 5% 5% 4 6% 8% 29%	9047
June	1st to 10th	Day	7% 4 2 6% 5% 5% 5% 4 8% 9% 46%	2940
	11th to 20th	Day	6% 4 1 4 4 4 5% 5% 8% 11% 48%	2871
	21st to end	Day	4 3 1 5% 6% 5% 4 4 7% 9% 52%	2800
July	1st to 10th	Day	7% 4 2 6% 5% 5% 5% 4 7% 10% 45%	6360
	11th to 20th	Day	5% 3 1 4 3 4 4 4 6% 11% 55%	5993
	21st to end	Day	9% 5% 2 6% 5% 5% 5% 5% 7% 9% 42%	6422
August	1st to 10th	Day	4 2 1 3 3 3 4 3 5% 8% 63%	4084
	11th to 20th	Day	8% 5% 2 6% 4 5% 5% 4 5% 8% 49%	3849
	21st to end	Day	5% 4 2 5% 3 3 4 3 6% 8% 57%	4312
September	1st to 10th	Day	9% 6% 2 5% 4 5% 4 4 6% 8% 47%	2400
	11th to 20th	Day	13% 4 1 5% 4 4 4 3 6% 7% 48%	2385
	21st to end	Day	11% 4 2 4 3 3 3 3 6% 7% 53%	2189
October	1st to 10th	Day	7% 4 2 5% 3 3 4 3 4 7% 59%	2000
	11th to 20th	Day	13% 5% 1 4 2 3 3 3 5% 6% 56%	2000
	21st to end	Day	20% 5% 2 5% 3 3 3 3 4 5% 49%	2200
November	1st to 10th	Day	12% 5% 2 5% 3 2 3 3 4 5% 56%	1948
	11th to 20th	Day	11% 6% 2 5% 4 3 3 3 5% 6% 52%	1890
	21st to end	Day	20% 7% 2 5% 3 3 4 3 3 5% 46%	1890
December	1st to 10th	Day	16% 6% 3 5% 4 3 3 2 4 4 50%	2775
	11th to 20th	Day	17% 8% 2 6% 4 4 3 3 4 5% 44%	3088
	21st to end	Day	18% 9% 3 7% 5% 4 4 3 5% 6% 35%	4070
January	1st to 10th	Night	18% 6% 2 5% 3 3 3 3 4 5% 47%	7890
	11th to 20th	Night	11% 5% 2 4 3 3 2 3 3 4 59%	7680
	21st to end	Night	20% 7% 2 6% 4 3 3 3 4 5% 44%	8402
February	1st to 10th	Night	20% 8% 2 5% 3 3 4 3 4 5% 44%	2679
	11th to 20th	Night	19% 7% 2 6% 4 3 3 2 4 6% 43%	2458
	21st to end	Night	18% 6% 2 6% 4 3 3 3 4 6% 44%	2076
March	1st to 10th	Night	17% 7% 2 6% 4 4 4 3 4 5% 43%	5334
	11th to 20th	Night	11% 5% 2 5% 4 4 4 3 5% 5% 52%	5090
	21st to end	Night	12% 5% 2 6% 5% 4 4 4 5% 8% 46%	5339
April	1st to 10th	Night	12% 5% 2 6% 4 4 4 3 5% 8% 49%	2100
	11th to 20th	Night	13% 4 2 5% 3 3 3 3 5% 7% 50%	2075
	21st to end	Night	14% 6% 1 6% 5% 4 4 4 5% 7% 45%	2100
May	1st to 10th	Night	18% 8% 3 6% 4 3 4 3 5% 7% 39%	5832
	11th to 20th	Night	15% 7% 3 7% 4 4 4 3 5% 7% 40%	5390
	21st to end	Night	18% 9% 3 8% 5% 4 5% 4 6% 7% 30%	5139
June	1st to 10th	Night	7% 4 2 5% 4 4 4 5% 7% 9% 48%	1680
	11th to 20th	Night	3 3 1 3 3 3 4 3 7% 10% 58%	1640
	21st to end	Night	4 3 2 3 4 4 4 5% 6% 11% 56%	1600
July	1st to 10th	Night	7% 4 2 5% 4 5% 4 5% 6% 11% 47%	3618
	11th to 20th	Night	4 3 1 4 3 4 4 4 7% 12% 55%	3978
	21st to end	Night	7% 6% 2 6% 4 4 4 3 6% 9% 47%	4449
August	1st to 10th	Night	2 2 1 3 3 3 4 4 5% 9% 66%	3070
	11th to 20th	Night	5% 3 1 4 4 4 4 4 6% 10% 55%	3200
	21st to end	Night	4 2 2 4 3 4 4 3 5% 9% 59%	3586
September	1st to 10th	Night	8% 4 2 4 4 2 4 3 5% 8% 55%	2000
	11th to 20th	Night	9% 4 2 4 4 5% 4 4 6% 7% 51%	2000
	21st to end	Night	8% 5% 2 6% 3 3 4 3 4 5% 57%	2203
October	1st to 10th	Night	8% 3 1 4 3 2 3 3 4 6% 62%	2400
	11th to 20th	Night	11% 4 2 5% 3 2 3 2 3 5% 60%	2400
	21st to end	Night	18% 4 1 5% 3 3 3 3 3 4 53%	2640
November	1st to 10th	Night	13% 5% 1 4 3 3 3 2 5% 5% 57%	2567
	11th to 20th	Night	12% 4 1 4 3 3 3 3 4 6% 57%	2730
	21st to end	Night	16% 5% 2 4 3 3 3 3 4 7% 50%	2730
December	1st to 10th	Night	16% 6% 2 5% 3 3 3 2 5% 5% 51%	4617
	11th to 20th	Night	18% 7% 2 6% 3 3 3 2 4 5% 46%	5339
	21st to end	Night	22% 7% 3 6% 5% 4 4 3 4 5% 38%	7150

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	44% 3 10% 29% 13% 2	5029
	11th to 20th	Day	33% 3 6% 27% 27% 3	5310
	21st to end	Day	41% 2 8% 19% 24% 6%	5812
February	1st to 10th	Day	46% 5% 12% 22% 14% 2	1938
	11th to 20th	Day	47% 5% 9% 20% 16% 4	2058
	21st to end	Day	49% 4 8% 17% 16% 6%	1730
March	1st to 10th	Day	50% 4 7% 16% 13% 10%	4783
	11th to 20th	Day	33% 4 6% 27% 20% 11%	5090
	21st to end	Day	42% 5% 9% 26% 17%	5819
April	1st to 10th	Day	38% 5% 10% 25% 19% 3	2520
	11th to 20th	Day	40% 4 11% 22% 16% 6%	2494
	21st to end	Day	42% 7% 10% 24% 17% 1	2520
May	1st to 10th	Day	44% 7% 11% 19% 17% 2	7056
	11th to 20th	Day	41% 9% 15% 19% 14% 2	7463
	21st to end	Day	51% 8% 11% 17% 11% 2	9061
June	1st to 10th	Day	32% 9% 14% 25% 19% 2	2940
	11th to 20th	Day	26% 7% 15% 30% 17% 4	2871
	21st to end	Day	26% 8% 14% 27% 21% 4	2800
July	1st to 10th	Day	32% 8% 13% 26% 20% 2	6291
	11th to 20th	Day	22% 8% 15% 40% 14% 2	5921
	21st to end	Day	35% 8% 15% 32% 10%	6240
August	1st to 10th	Day	18% 6% 17% 33% 23% 3	4070
	11th to 20th	Day	33% 6% 15% 27% 16% 2	3885
	21st to end	Day	24% 6% 12% 36% 20% 3	4311
September	1st to 10th	Day	33% 7% 11% 27% 17% 6%	2400
	11th to 20th	Day	33% 7% 9% 23% 23% 4	2385
	21st to end	Day	30% 5% 9% 23% 25% 7%	2189
October	1st to 10th	Day	16% 4 6% 15% 40% 20%	3260
	11th to 20th	Day	19% 3 5% 23% 38% 13%	3240
	21st to end	Day	30% 3 4 29% 28% 6%	3538
November	1st to 10th	Day	32% 4 7% 26% 24% 8%	1948
	11th to 20th	Day	33% 4 8% 24% 24% 7%	1890
	21st to end	Day	42% 4 7% 21% 22% 4	1890
December	1st to 10th	Day	39% 4 8% 27% 20% 2	2775
	11th to 20th	Day	43% 3 9% 26% 16% 3	3085
	21st to end	Day	48% 5% 9% 24% 12% 2	4070
January	1st to 10th	Night	42% 2 9% 30% 14% 3	7891
	11th to 20th	Night	30% 3 6% 21% 34% 6%	7680
	21st to end	Night	44% 3 9% 19% 21% 4	8402
February	1st to 10th	Night	44% 4 9% 22% 18% 3	2679
	11th to 20th	Night	43% 4 8% 23% 17% 5%	2459
	21st to end	Night	41% 4 8% 18% 20% 8%	2076
March	1st to 10th	Night	43% 4 7% 15% 20% 11%	5334
	11th to 20th	Night	34% 4 8% 23% 19% 12%	5090
	21st to end	Night	37% 5% 10% 26% 19% 3	5339
April	1st to 10th	Night	33% 5% 11% 25% 21% 5%	2100
	11th to 20th	Night	34% 4 8% 24% 22% 8%	2075
	21st to end	Night	38% 5% 10% 23% 21% 3	2100
May	1st to 10th	Night	45% 6% 13% 21% 15% 1	5862
	11th to 20th	Night	44% 6% 12% 23% 12% 4	5391
	21st to end	Night	52% 7% 12% 16% 10% 3	5149
June	1st to 10th	Night	29% 7% 14% 25% 23% 2	1680
	11th to 20th	Night	21% 6% 14% 30% 25% 5%	1640
	21st to end	Night	22% 6% 14% 30% 21% 7%	1600
July	1st to 10th	Night	29% 8% 16% 22% 22% 2	3580
	11th to 20th	Night	20% 7% 22% 33% 15% 2	3930
	21st to end	Night	33% 7% 15% 32% 13%	4320
August	1st to 10th	Night	15% 6% 14% 38% 23% 3	3060
	11th to 20th	Night	24% 6% 18% 32% 19% 2	3230
	21st to end	Night	21% 6% 11% 31% 27% 3	3586
September	1st to 10th	Night	28% 7% 9% 28% 20% 9%	2000
	11th to 20th	Night	30% 6% 10% 24% 25% 6%	2000
	21st to end	Night	30% 4 10% 19% 28% 9%	2203
October	1st to 10th	Night	14% 3 5% 18% 34% 25%	3920
	11th to 20th	Night	18% 3 4 16% 36% 23%	3899
	21st to end	Night	27% 3 5% 24% 28% 12%	4252
November	1st to 10th	Night	30% 4 7% 26% 26% 7%	2567
	11th to 20th	Night	30% 3 7% 25% 26% 10%	2730
	21st to end	Night	36% 3 8% 23% 25% 4	2730
December	1st to 10th	Night	35% 3 8% 31% 20% 2	4617
	11th to 20th	Night	42% 3 7% 23% 21% 4	5341
	21st to end	Night	48% 4 10% 23% 12% 3	7150

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	23% 12% 40% 17% 6% 2	330
	11th to 20th	Day	22% 14% 42% 18% 3	330
	21st to end	Day	18% 10% 48% 20% 4	363
February	1st to 10th	Day	28% 11% 35% 19% 7% 1	330
	11th to 20th	Day	25% 20% 35% 17% 2 1	330
	21st to end	Day	30% 13% 37% 15% 5%	273
March	1st to 10th	Day	25% 12% 32% 21% 9% 1	330
	11th to 20th	Day	21% 18% 35% 23% 4	330
	21st to end	Day	20% 12% 37% 22% 8% 1	468
April	1st to 10th	Day	19% 11% 35% 24% 11% 1	540
	11th to 20th	Day	18% 11% 34% 26% 8% 2	532
	21st to end	Day	17% 11% 33% 25% 12% 3	540
May	1st to 10th	Day	15% 12% 30% 29% 12% 2	543
	11th to 20th	Day	14% 7% 22% 29% 20% 9%	613
	21st to end	Day	11% 5% 19% 31% 25% 9%	844
June	1st to 10th	Day	8% 5% 14% 31% 26% 17%	780
	11th to 20th	Day	5% 3 13% 32% 34% 13%	756
	21st to end	Day	5% 2 14% 32% 32% 16%	730
July	1st to 10th	Day	7% 2 9% 26% 33% 23%	721
	11th to 20th	Day	5% 2 7% 25% 39% 22%	718
	21st to end	Day	8% 2 6% 27% 36% 21%	794
August	1st to 10th	Day	6% 2 7% 34% 36% 16%	641
	11th to 20th	Day	11% 1 7% 24% 39% 18%	519
	21st to end	Day	8% 8% 22% 35% 26%	583
September	1st to 10th	Day	9% 2 8% 28% 36% 18%	530
	11th to 20th	Day	11% 2 9% 20% 35% 23%	530
	21st to end	Day	14% 3 15% 29% 25% 14%	519
October	1st to 10th	Day	7% 3 19% 33% 30% 8%	330
	11th to 20th	Day	11% 6% 31% 28% 17% 7%	330
	21st to end	Day	25% 8% 30% 22% 12% 2	363
November	1st to 10th	Day	17% 8% 25% 32% 15% 2	330
	11th to 20th	Day	9% 11% 37% 30% 12% 2	330
	21st to end	Day	23% 14% 29% 22% 11% 2	330
December	1st to 10th	Day	17% 13% 36% 21% 11% 2	330
	11th to 20th	Day	22% 10% 36% 22% 10% 1	330
	21st to end	Day	23% 18% 34% 22% 3 1	363
January	1st to 10th	Night	20% 9% 38% 28% 5%	1050
	11th to 20th	Night	20% 11% 40% 26% 3	1050
	21st to end	Night	19% 8% 41% 29% 2	1155
February	1st to 10th	Night	24% 7% 35% 31% 3	999
	11th to 20th	Night	22% 9% 41% 25% 3	823
	21st to end	Night	22% 14% 36% 26% 2	692
March	1st to 10th	Night	19% 10% 34% 32% 5%	772
	11th to 20th	Night	20% 12% 37% 27% 5%	630
	21st to end	Night	17% 9% 35% 30% 9%	693
April	1st to 10th	Night	13% 8% 42% 29% 8%	630
	11th to 20th	Night	15% 9% 33% 31% 11%	623
	21st to end	Night	16% 5% 36% 30% 11% 1	630
May	1st to 10th	Night	16% 6% 28% 37% 12% 1	630
	11th to 20th	Night	14% 6% 25% 35% 17% 3	621
	21st to end	Night	9% 4 20% 41% 24% 3	683
June	1st to 10th	Night	7% 3 14% 40% 31% 5%	630
	11th to 20th	Night	3 2 10% 47% 35% 3	615
	21st to end	Night	4 1 12% 38% 41% 4	600
July	1st to 10th	Night	5% 2 7% 33% 44% 9%	585
	11th to 20th	Night	4 2 7% 32% 47% 9%	582
	21st to end	Night	7% 1 6% 31% 44% 10%	657
August	1st to 10th	Night	4 1 6% 35% 48% 7%	597
	11th to 20th	Night	7% 1 7% 34% 43% 7%	594
	21st to end	Night	7% 1 5% 30% 50% 8%	660
September	1st to 10th	Night	9% 1 8% 36% 41% 6%	600
	11th to 20th	Night	11% 1 10% 31% 39% 8%	600
	21st to end	Night	10% 3 16% 36% 32% 4	795
October	1st to 10th	Night	8% 3 17% 37% 30% 4	800
	11th to 20th	Night	13% 5% 26% 38% 17% 2	800
	21st to end	Night	20% 5% 28% 33% 13% 1	880
November	1st to 10th	Night	14% 5% 29% 36% 16% 1	820
	11th to 20th	Night	14% 7% 33% 37% 9%	840
	21st to end	Night	17% 8% 32% 31% 12%	840
December	1st to 10th	Night	22% 8% 31% 34% 5% 1	986
	11th to 20th	Night	21% 7% 32% 34% 6%	1050
	21st to end	Night	23% 9% 34% 28% 5%	1155

Page generated at 2026-06-13 01:31:40. Version ac07

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