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 2025-02-21.

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% 46%	108504
	Night	14% 5% 2 5% 4 3 3 3 5% 7% 49%	110236
Transparency	Day	36% 6% 10% 25% 19% 4	112142
	Night	34% 5% 10% 24% 21% 6%	114739
Seeing	Day	14% 6% 22% 26% 22% 10%	15736
	Night	15% 6% 26% 33% 18% 2	25679

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% 4 3 3 2 4 4 47%	3870
	11th to 20th	Day	13% 7% 2 5% 3 3 3 3 3 5% 54%	4080
	21st to end	Day	21% 6% 2 4 2 2 3 3 5% 5% 48%	4488
February	1st to 10th	Day	21% 7% 2 6% 4 4 4 4 4 6% 39%	1845
	11th to 20th	Day	17% 9% 2 7% 5% 4 3 3 5% 7% 39%	1948
	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% 1 5% 4 4 4 3 6% 7% 48%	2266
	21st to end	Day	10% 4 2 4 3 3 3 3 6% 7% 53%	2080
October	1st to 10th	Day	7% 4 2 5% 3 3 4 3 4 6% 59%	1900
	11th to 20th	Day	14% 5% 1 4 2 3 3 3 5% 6% 55%	1900
	21st to end	Day	19% 5% 2 4 3 3 3 3 4 5% 50%	2090
November	1st to 10th	Day	12% 6% 2 6% 3 2 3 3 4 5% 55%	1853
	11th to 20th	Day	11% 6% 2 5% 4 3 3 3 5% 6% 52%	1800
	21st to end	Day	20% 7% 2 5% 3 3 4 3 3 4 46%	1800
December	1st to 10th	Day	16% 6% 3 5% 4 3 3 2 4 4 50%	2692
	11th to 20th	Day	17% 8% 3 6% 4 4 3 2 4 5% 44%	3008
	21st to end	Day	19% 9% 3 7% 5% 4 4 3 5% 6% 34%	3982
January	1st to 10th	Night	17% 6% 2 6% 3 4 3 3 4 5% 47%	6090
	11th to 20th	Night	13% 6% 2 5% 3 3 3 3 3 5% 55%	5900
	21st to end	Night	20% 6% 2 5% 3 3 3 2 3 5% 46%	6490
February	1st to 10th	Night	21% 8% 2 5% 3 3 4 3 4 5% 42%	2552
	11th to 20th	Night	19% 7% 2 6% 4 3 3 2 4 5% 44%	2338
	21st to end	Night	19% 6% 2 6% 4 4 3 4 5% 6% 42%	1885
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%	1900
	21st to end	Night	8% 4 1 6% 3 3 4 3 4 5% 58%	2092
October	1st to 10th	Night	7% 3 1 4 3 3 3 3 5% 7% 61%	2280
	11th to 20th	Night	11% 4 2 5% 3 2 3 2 4 5% 59%	2280
	21st to end	Night	17% 4 1 5% 3 3 3 3 3 4 53%	2508
November	1st to 10th	Night	13% 5% 1 4 3 3 3 2 5% 5% 55%	2442
	11th to 20th	Night	12% 4 1 4 3 3 3 3 4 6% 56%	2600
	21st to end	Night	15% 5% 2 4 4 3 3 3 4 6% 51%	2600
December	1st to 10th	Night	17% 6% 2 5% 3 2 3 2 4 5% 52%	4480
	11th to 20th	Night	18% 7% 2 6% 3 3 3 3 4 5% 46%	5199
	21st to end	Night	22% 7% 3 6% 5% 4 4 3 4 5% 38%	6996

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	42% 3 10% 27% 16% 2	3871
	11th to 20th	Day	35% 3 7% 30% 22% 3	4080
	21st to end	Day	40% 3 9% 17% 26% 7%	4488
February	1st to 10th	Day	46% 5% 12% 22% 13% 2	1845
	11th to 20th	Day	47% 5% 9% 19% 16% 4	1958
	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	34% 7% 9% 22% 24% 5%	2266
	21st to end	Day	30% 5% 10% 24% 25% 6%	2080
October	1st to 10th	Day	16% 4 6% 15% 40% 21%	3160
	11th to 20th	Day	19% 3 5% 23% 37% 13%	3140
	21st to end	Day	29% 4 4 29% 28% 6%	3428
November	1st to 10th	Day	33% 4 7% 25% 23% 8%	1853
	11th to 20th	Day	33% 4 8% 24% 25% 7%	1800
	21st to end	Day	42% 4 7% 22% 22% 4	1800
December	1st to 10th	Day	39% 4 8% 27% 20% 2	2692
	11th to 20th	Day	44% 3 8% 26% 15% 3	3005
	21st to end	Day	49% 5% 9% 24% 12% 2	3982
January	1st to 10th	Night	41% 2 10% 26% 17% 3	6090
	11th to 20th	Night	33% 4 7% 23% 28% 5%	5900
	21st to end	Night	43% 3 8% 21% 22% 4	6490
February	1st to 10th	Night	46% 4 8% 21% 18% 3	2552
	11th to 20th	Night	43% 4 8% 22% 17% 5%	2339
	21st to end	Night	43% 5% 8% 18% 18% 8%	1885
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	31% 6% 9% 22% 26% 6%	1900
	21st to end	Night	29% 4 10% 20% 28% 9%	2092
October	1st to 10th	Night	14% 3 5% 18% 34% 25%	3800
	11th to 20th	Night	18% 3 4 16% 35% 24%	3779
	21st to end	Night	26% 3 5% 25% 28% 12%	4120
November	1st to 10th	Night	31% 4 7% 25% 26% 7%	2442
	11th to 20th	Night	30% 3 7% 23% 27% 10%	2600
	21st to end	Night	35% 3 8% 23% 26% 5%	2600
December	1st to 10th	Night	35% 3 7% 31% 21% 3	4480
	11th to 20th	Night	42% 3 7% 23% 21% 4	5201
	21st to end	Night	48% 4 10% 23% 12% 3	6996

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	24% 11% 41% 15% 7% 2	300
	11th to 20th	Day	24% 14% 40% 19% 3	300
	21st to end	Day	17% 10% 47% 22% 4	330
February	1st to 10th	Day	29% 11% 34% 18% 7% 1	300
	11th to 20th	Day	26% 19% 35% 17% 2 1	300
	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% 2 10% 21% 33% 22%	490
	21st to end	Day	14% 3 15% 30% 25% 14%	480
October	1st to 10th	Day	7% 3 19% 33% 32% 7%	300
	11th to 20th	Day	12% 6% 31% 27% 17% 7%	300
	21st to end	Day	24% 8% 30% 22% 13% 3	330
November	1st to 10th	Day	17% 9% 25% 30% 17% 3	300
	11th to 20th	Day	9% 10% 36% 31% 12% 2	300
	21st to end	Day	23% 12% 30% 22% 11% 2	300
December	1st to 10th	Day	17% 14% 37% 19% 11% 2	300
	11th to 20th	Day	23% 10% 35% 22% 10% 1	300
	21st to end	Day	23% 18% 34% 21% 3 1	330
January	1st to 10th	Night	20% 9% 38% 28% 5%	1000
	11th to 20th	Night	21% 11% 39% 26% 3 1	1000
	21st to end	Night	20% 8% 40% 30% 2	1100
February	1st to 10th	Night	25% 7% 35% 30% 3	952
	11th to 20th	Night	22% 9% 41% 25% 3	783
	21st to end	Night	23% 14% 37% 24% 2	629
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% 31% 38% 8%	570
	21st to end	Night	9% 3 16% 35% 32% 4	755
October	1st to 10th	Night	8% 3 17% 37% 31% 5%	760
	11th to 20th	Night	13% 5% 27% 37% 16% 2	760
	21st to end	Night	19% 5% 27% 34% 14% 1	836
November	1st to 10th	Night	15% 5% 28% 36% 16% 1	780
	11th to 20th	Night	14% 7% 33% 37% 10%	800
	21st to end	Night	17% 8% 31% 31% 12%	800
December	1st to 10th	Night	22% 8% 30% 34% 6% 1	939
	11th to 20th	Night	21% 7% 31% 34% 6%	1000
	21st to end	Night	23% 9% 34% 28% 5%	1100

Page generated at 2025-02-18 02:26:32. Version ac07

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