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 2024-09-14.

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% 46%	100374
	Night	13% 5% 2 5% 4 3 4 3 5% 7% 49%	97575
Transparency	Day	37% 6% 11% 25% 18% 3	100174
	Night	35% 5% 10% 25% 21% 5%	97447
Seeing	Day	14% 6% 21% 26% 22% 11%	15241
	Night	15% 6% 26% 33% 18% 2	24982

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% 10% 3 7% 4 3 2 2 4 4 45%	2696
	11th to 20th	Day	16% 9% 2 5% 4 3 3 2 3 4 50%	2850
	21st to end	Day	25% 8% 2 5% 2 2 2 2 4 4 43%	3135
February	1st to 10th	Day	20% 7% 2 6% 4 4 4 4 4 6% 39%	1752
	11th to 20th	Day	16% 9% 2 7% 5% 4 3 3 5% 7% 39%	1848
	21st to end	Day	22% 8% 3 7% 5% 4 3 2 5% 5% 35%	1570
March	1st to 10th	Day	21% 10% 3 7% 3 4 4 3 4 5% 36%	3263
	11th to 20th	Day	15% 6% 2 6% 4 4 3 3 4 5% 48%	3480
	21st to end	Day	14% 7% 2 8% 5% 4 4 3 5% 6% 41%	3973
April	1st to 10th	Day	12% 7% 3 6% 4 3 3 3 5% 7% 46%	2280
	11th to 20th	Day	15% 7% 2 6% 4 3 4 3 5% 6% 44%	2254
	21st to end	Day	16% 6% 2 7% 4 4 3 3 5% 8% 41%	2280
May	1st to 10th	Day	12% 6% 2 7% 5% 5% 5% 4 7% 8% 38%	3765
	11th to 20th	Day	13% 4 2 6% 4 5% 5% 5% 7% 10% 39%	3996
	21st to end	Day	11% 6% 2 7% 6% 5% 5% 5% 7% 9% 37%	4824
June	1st to 10th	Day	7% 4 2 6% 5% 4 5% 4 8% 9% 46%	2660
	11th to 20th	Day	5% 3 1 4 3 4 5% 5% 8% 11% 50%	2660
	21st to end	Day	4 3 2 5% 6% 5% 4 4 6% 9% 52%	2660
July	1st to 10th	Day	8% 4 2 5% 5% 5% 5% 5% 7% 10% 44%	4440
	11th to 20th	Day	6% 3 1 4 3 3 4 4 5% 9% 57%	4185
	21st to end	Day	13% 6% 3 8% 6% 5% 6% 5% 7% 7% 34%	4465
August	1st to 10th	Day	4 2 1 3 3 3 4 3 5% 8% 63%	3958
	11th to 20th	Day	8% 5% 2 6% 4 5% 5% 4 5% 8% 48%	3729
	21st to end	Day	5% 4 2 5% 3 4 4 3 6% 8% 57%	4180
September	1st to 10th	Day	9% 6% 2 5% 4 5% 4 4 6% 8% 48%	2280
	11th to 20th	Day	13% 5% 2 5% 4 4 4 3 6% 7% 49%	2184
	21st to end	Day	10% 4 1 4 3 3 3 3 6% 7% 55%	1971
October	1st to 10th	Day	8% 4 2 5% 3 3 4 3 4 7% 57%	1800
	11th to 20th	Day	14% 5% 1 4 2 3 3 3 5% 6% 53%	1800
	21st to end	Day	20% 5% 2 5% 3 3 3 3 4 5% 49%	1980
November	1st to 10th	Day	11% 5% 2 5% 3 2 3 3 4 5% 57%	1759
	11th to 20th	Day	11% 7% 2 5% 4 3 3 3 5% 6% 52%	1710
	21st to end	Day	20% 7% 2 5% 3 3 4 3 4 4 45%	1710
December	1st to 10th	Day	20% 6% 3 5% 4 3 3 3 4 5% 43%	1576
	11th to 20th	Day	15% 8% 3 7% 5% 4 4 3 5% 4 43%	1918
	21st to end	Day	16% 9% 3 7% 5% 5% 4 3 5% 6% 36%	2783
January	1st to 10th	Night	18% 6% 2 5% 4 4 3 3 4 5% 45%	4254
	11th to 20th	Night	16% 6% 2 5% 4 3 3 3 4 5% 49%	4120
	21st to end	Night	24% 7% 2 5% 2 3 3 2 3 4 45%	4532
February	1st to 10th	Night	21% 8% 2 5% 3 3 4 3 4 5% 42%	2425
	11th to 20th	Night	18% 7% 2 6% 4 3 3 2 4 5% 45%	2218
	21st to end	Night	19% 6% 2 6% 4 4 3 4 5% 6% 42%	1884
March	1st to 10th	Night	20% 8% 2 6% 4 3 3 3 4 5% 42%	3619
	11th to 20th	Night	15% 6% 2 5% 4 3 3 2 4 5% 53%	3480
	21st to end	Night	12% 6% 2 6% 5% 4 4 4 5% 8% 44%	3643
April	1st to 10th	Night	11% 5% 2 6% 4 4 4 3 5% 8% 49%	1900
	11th to 20th	Night	14% 4 2 5% 3 3 3 3 5% 7% 50%	1875
	21st to end	Night	14% 6% 1 6% 4 4 4 4 5% 6% 46%	1900
May	1st to 10th	Night	19% 6% 2 5% 4 3 3 3 5% 8% 42%	3130
	11th to 20th	Night	13% 6% 3 5% 3 4 3 4 5% 8% 45%	2895
	21st to end	Night	9% 6% 3 6% 5% 4 5% 5% 7% 9% 42%	2743
June	1st to 10th	Night	7% 4 2 5% 4 4 5% 6% 7% 9% 48%	1520
	11th to 20th	Night	2 3 1 3 3 3 3 3 7% 10% 61%	1520
	21st to end	Night	4 2 2 3 4 4 4 5% 6% 11% 55%	1520
July	1st to 10th	Night	7% 4 1 5% 3 4 4 4 6% 13% 48%	2530
	11th to 20th	Night	5% 3 2 4 3 3 3 4 7% 11% 56%	2779
	21st to end	Night	10% 8% 3 8% 5% 5% 5% 3 6% 7% 40%	3098
August	1st to 10th	Night	2 2 1 3 3 3 4 3 5% 9% 66%	2976
	11th to 20th	Night	5% 3 1 4 4 4 4 4 7% 10% 55%	3100
	21st to end	Night	4 2 2 4 3 4 4 3 5% 9% 59%	3476
September	1st to 10th	Night	9% 4 2 4 4 2 4 3 5% 8% 56%	1900
	11th to 20th	Night	10% 4 2 4 4 5% 4 4 6% 7% 50%	1840
	21st to end	Night	7% 4 1 5% 3 3 4 3 4 5% 60%	1981
October	1st to 10th	Night	8% 3 1 4 3 3 4 3 5% 7% 60%	2160
	11th to 20th	Night	12% 5% 2 5% 3 2 3 2 4 5% 57%	2160
	21st to end	Night	18% 5% 1 5% 3 3 3 3 3 4 52%	2376
November	1st to 10th	Night	13% 4 1 3 3 3 3 3 5% 6% 58%	2316
	11th to 20th	Night	13% 4 1 5% 3 3 3 3 4 6% 56%	2470
	21st to end	Night	16% 5% 2 4 4 3 3 3 4 6% 50%	2470
December	1st to 10th	Night	19% 6% 2 6% 3 3 3 2 4 6% 46%	2602
	11th to 20th	Night	16% 6% 2 6% 3 4 3 3 4 5% 49%	3279
	21st to end	Night	16% 7% 3 7% 5% 4 4 3 5% 6% 38%	4884

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 6% 27% 17% 3	2697
	11th to 20th	Day	41% 3 9% 28% 17% 2	2850
	21st to end	Day	46% 2 10% 19% 20% 3	3135
February	1st to 10th	Day	46% 5% 12% 22% 14% 2	1752
	11th to 20th	Day	46% 5% 9% 19% 17% 4	1858
	21st to end	Day	52% 3 9% 16% 14% 6%	1570
March	1st to 10th	Day	50% 5% 9% 13% 15% 8%	3263
	11th to 20th	Day	39% 5% 7% 27% 18% 5%	3480
	21st to end	Day	44% 5% 10% 22% 18% 1	3973
April	1st to 10th	Day	38% 5% 9% 25% 20% 3	2280
	11th to 20th	Day	40% 4 10% 23% 17% 6%	2254
	21st to end	Day	42% 6% 9% 25% 18% 1	2280
May	1st to 10th	Day	43% 8% 12% 20% 16% 2	3800
	11th to 20th	Day	37% 10% 16% 23% 13% 1	4000
	21st to end	Day	41% 9% 11% 23% 14% 2	4837
June	1st to 10th	Day	32% 9% 14% 25% 19% 2	2660
	11th to 20th	Day	25% 7% 15% 32% 17% 4	2660
	21st to end	Day	27% 8% 13% 27% 21% 4	2660
July	1st to 10th	Day	32% 9% 15% 27% 16% 2	4371
	11th to 20th	Day	24% 6% 11% 38% 19% 2	4113
	21st to end	Day	46% 8% 14% 25% 8% 1	4325
August	1st to 10th	Day	19% 6% 17% 32% 23% 3	3944
	11th to 20th	Day	33% 6% 16% 26% 17% 2	3765
	21st to end	Day	24% 6% 12% 36% 19% 3	4179
September	1st to 10th	Day	33% 7% 11% 26% 17% 7%	2280
	11th to 20th	Day	33% 7% 9% 22% 24% 5%	2184
	21st to end	Day	28% 5% 10% 25% 26% 7%	1971
October	1st to 10th	Day	27% 6% 10% 23% 25% 9%	1800
	11th to 20th	Day	31% 4 7% 24% 26% 8%	1800
	21st to end	Day	38% 4 6% 25% 21% 7%	1980
November	1st to 10th	Day	30% 4 7% 26% 24% 8%	1759
	11th to 20th	Day	33% 4 8% 24% 25% 6%	1710
	21st to end	Day	43% 4 7% 20% 23% 4	1710
December	1st to 10th	Day	43% 4 9% 23% 17% 3	1576
	11th to 20th	Day	44% 3 8% 24% 18% 2	1915
	21st to end	Day	48% 5% 10% 21% 13% 3	2783
January	1st to 10th	Night	42% 3 6% 26% 21% 3	4254
	11th to 20th	Night	38% 5% 9% 24% 21% 3	4120
	21st to end	Night	44% 3 10% 22% 18% 3	4532
February	1st to 10th	Night	45% 4 9% 21% 18% 3	2425
	11th to 20th	Night	42% 4 8% 22% 18% 5%	2219
	21st to end	Night	43% 5% 8% 18% 18% 8%	1884
March	1st to 10th	Night	45% 5% 8% 14% 18% 10%	3619
	11th to 20th	Night	35% 5% 9% 25% 21% 6%	3480
	21st to end	Night	39% 5% 11% 26% 18% 1	3643
April	1st to 10th	Night	33% 5% 10% 24% 21% 6%	1900
	11th to 20th	Night	34% 4 7% 24% 23% 8%	1875
	21st to end	Night	38% 5% 9% 24% 21% 3	1900
May	1st to 10th	Night	41% 7% 13% 23% 14% 2	3160
	11th to 20th	Night	36% 7% 15% 25% 14% 2	2896
	21st to end	Night	36% 9% 13% 25% 15% 2	2751
June	1st to 10th	Night	29% 7% 14% 26% 21% 3	1520
	11th to 20th	Night	18% 5% 14% 32% 26% 5%	1520
	21st to end	Night	22% 6% 14% 30% 20% 7%	1520
July	1st to 10th	Night	26% 7% 19% 27% 18% 2	2490
	11th to 20th	Night	20% 7% 14% 34% 21% 4	2728
	21st to end	Night	43% 7% 12% 25% 12%	2999
August	1st to 10th	Night	15% 6% 14% 38% 24% 3	2966
	11th to 20th	Night	24% 6% 18% 31% 19% 2	3130
	21st to end	Night	21% 6% 11% 31% 27% 3	3476
September	1st to 10th	Night	28% 7% 9% 28% 20% 9%	1900
	11th to 20th	Night	30% 7% 9% 22% 25% 6%	1840
	21st to end	Night	27% 4 9% 21% 30% 9%	1981
October	1st to 10th	Night	24% 4 9% 28% 24% 11%	2160
	11th to 20th	Night	30% 4 6% 19% 31% 10%	2160
	21st to end	Night	37% 4 7% 19% 25% 8%	2376
November	1st to 10th	Night	29% 4 7% 26% 27% 8%	2316
	11th to 20th	Night	31% 3 7% 23% 26% 10%	2470
	21st to end	Night	36% 3 8% 22% 26% 4	2470
December	1st to 10th	Night	41% 3 8% 24% 19% 4	2602
	11th to 20th	Night	39% 3 7% 23% 24% 4	3281
	21st to end	Night	46% 5% 11% 19% 16% 3	4884

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	25% 11% 39% 16% 7% 2	270
	11th to 20th	Day	27% 13% 37% 19% 3	270
	21st to end	Day	18% 9% 47% 21% 4	297
February	1st to 10th	Day	28% 11% 33% 19% 7% 1	270
	11th to 20th	Day	25% 18% 35% 19% 2 1	270
	21st to end	Day	35% 12% 34% 13% 5%	225
March	1st to 10th	Day	24% 12% 29% 24% 10% 1	270
	11th to 20th	Day	22% 16% 32% 25% 5%	270
	21st to end	Day	21% 12% 36% 21% 9% 1	392
April	1st to 10th	Day	18% 11% 36% 23% 11% 1	460
	11th to 20th	Day	20% 10% 33% 27% 8% 2	452
	21st to end	Day	18% 10% 34% 23% 12% 3	460
May	1st to 10th	Day	14% 12% 29% 30% 13% 2	463
	11th to 20th	Day	13% 5% 22% 29% 21% 10%	529
	21st to end	Day	8% 4 19% 32% 26% 10%	734
June	1st to 10th	Day	8% 4 13% 29% 27% 19%	680
	11th to 20th	Day	5% 2 11% 33% 35% 15%	680
	21st to end	Day	5% 2 14% 33% 30% 16%	680
July	1st to 10th	Day	6% 2 9% 27% 33% 23%	671
	11th to 20th	Day	5% 2 7% 25% 38% 23%	668
	21st to end	Day	8% 2 6% 28% 36% 20%	739
August	1st to 10th	Day	6% 1 7% 34% 36% 16%	595
	11th to 20th	Day	12% 1 8% 25% 39% 15%	479
	21st to end	Day	8% 7% 21% 35% 28%	539
September	1st to 10th	Day	9% 1 8% 27% 36% 19%	490
	11th to 20th	Day	12% 1 10% 21% 34% 22%	463
	21st to end	Day	13% 2 13% 30% 27% 15%	441
October	1st to 10th	Day	7% 3 20% 33% 30% 7%	270
	11th to 20th	Day	13% 6% 33% 27% 16% 5%	270
	21st to end	Day	25% 9% 30% 20% 13% 3	297
November	1st to 10th	Day	15% 6% 26% 31% 19% 3	270
	11th to 20th	Day	9% 9% 37% 31% 12% 2	270
	21st to end	Day	24% 11% 29% 23% 12% 1	270
December	1st to 10th	Day	18% 13% 37% 19% 12% 2	270
	11th to 20th	Day	22% 9% 35% 23% 11% 1	270
	21st to end	Day	23% 18% 35% 20% 3 1	297
January	1st to 10th	Night	21% 9% 38% 28% 5%	950
	11th to 20th	Night	21% 11% 38% 26% 3 1	950
	21st to end	Night	20% 8% 40% 30% 2	1045
February	1st to 10th	Night	25% 7% 34% 31% 4	905
	11th to 20th	Night	20% 9% 42% 26% 3	743
	21st to end	Night	23% 14% 37% 24% 2	628
March	1st to 10th	Night	19% 10% 33% 33% 6%	698
	11th to 20th	Night	21% 11% 36% 28% 5%	570
	21st to end	Night	19% 9% 33% 30% 9%	627
April	1st to 10th	Night	12% 8% 42% 30% 8%	570
	11th to 20th	Night	16% 8% 33% 31% 12%	563
	21st to end	Night	16% 5% 36% 31% 10% 1	570
May	1st to 10th	Night	16% 6% 28% 36% 13% 1	570
	11th to 20th	Night	13% 5% 25% 36% 18% 3	561
	21st to end	Night	7% 2 20% 42% 25% 4	617
June	1st to 10th	Night	7% 3 14% 38% 33% 5%	570
	11th to 20th	Night	2 1 9% 48% 36% 3	570
	21st to end	Night	4 1 13% 40% 39% 4	570
July	1st to 10th	Night	5% 1 7% 35% 43% 9%	555
	11th to 20th	Night	4 2 7% 32% 46% 9%	552
	21st to end	Night	8% 1 6% 32% 43% 10%	624
August	1st to 10th	Night	4 1 5% 34% 49% 8%	567
	11th to 20th	Night	8% 1 7% 35% 42% 6%	564
	21st to end	Night	7% 1 5% 28% 51% 8%	627
September	1st to 10th	Night	9% 1 7% 36% 42% 6%	570
	11th to 20th	Night	11% 1 11% 32% 38% 8%	552
	21st to end	Night	9% 3 15% 36% 33% 4	715
October	1st to 10th	Night	8% 3 18% 36% 30% 5%	720
	11th to 20th	Night	13% 5% 27% 37% 15% 2	720
	21st to end	Night	20% 5% 27% 33% 14% 1	792
November	1st to 10th	Night	14% 4 28% 36% 17% 1	740
	11th to 20th	Night	15% 7% 33% 36% 10%	760
	21st to end	Night	18% 7% 31% 31% 13%	760
December	1st to 10th	Night	23% 7% 30% 34% 6% 1	892
	11th to 20th	Night	21% 7% 31% 35% 7%	950
	21st to end	Night	23% 9% 35% 29% 5%	1045

Page generated at 2024-09-11 09:00:06. Version ac07

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