Jonesboro
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Jonesboro clear sky chart from 2005-11-05 to 2017-09-21.

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 TypeMinimum conditions for hour to be usableOut of hours
Clear of CloudsTransparencySeeingSky Brightness
Planetary:50%(no limit)Average(no limit)Nighttime Hours
Deep Sky:70%Average(no limit)5.9Nighttime Hours
CCD Imaging:70%Below AveragePoor(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

PlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
Night
50%
15695
25%
46944
18%
15650
57%
15650
33%
27890

By Month

MonthDays of MonthPlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
January1st to 15thNight
31%
900
26%
2377
11%
895
41%
895
30%
1530
January16th to endNight
29%
960
25%
2496
9%
960
39%
960
30%
1619
February1st to 15thNight
31%
796
20%
2204
9%
793
39%
793
30%
1412
February16th to endNight
27%
631
25%
1893
9%
631
40%
631
29%
1169
March1st to 15thNight
32%
621
19%
2061
12%
621
39%
621
23%
1303
March16th to endNight
39%
576
19%
2051
16%
576
46%
576
24%
1262
April1st to 15thNight
36%
539
26%
1797
15%
539
51%
539
33%
1008
April16th to endNight
43%
540
25%
1800
20%
540
55%
540
32%
1037
May1st to 15thNight
49%
539
19%
1800
15%
539
56%
539
28%
1088
May16th to endNight
58%
562
23%
1525
17%
561
62%
561
33%
967
June1st to 15thNight
75%
540
26%
1440
21%
540
77%
540
47%
784
June16th to endNight
77%
540
27%
1440
22%
540
80%
540
44%
818
July1st to 15thNight
76%
510
18%
1390
17%
510
77%
510
41%
820
July16th to endNight
81%
564
23%
1594
26%
531
82%
531
44%
851
August1st to 15thNight
81%
539
25%
1721
29%
536
82%
536
40%
902
August16th to endNight
76%
573
25%
1910
31%
573
77%
573
34%
1055
September1st to 15thNight
71%
540
27%
1800
29%
540
73%
540
33%
1014
September16th to endNight
67%
618
30%
1822
26%
618
70%
618
38%
1040
October1st to 15thNight
60%
660
33%
1980
27%
660
64%
660
38%
1109
October16th to endNight
54%
704
33%
2112
24%
704
62%
704
40%
1175
November1st to 15thNight
51%
700
31%
2220
24%
700
61%
700
38%
1190
November16th to endNight
42%
720
27%
2340
19%
720
52%
720
30%
1369
December1st to 15thNight
36%
863
22%
2483
12%
863
46%
863
27%
1596
December16th to endNight
32%
960
21%
2688
10%
960
41%
960
26%
1772

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 ForecastData
Points
Cloud CoverDay
12%5%25%43445%7%44%
47914
Night
12%424423347%49%
47134
TransparencyDay
37%6%11%23%17%3
47608
Night
34%410%24%20%5%
46946
SeeingDay
12%317%25%26%14%
5749
Night
14%425%32%20%2
15697

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
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 15thDay
20%6%1331233448%
1558
16th to endDay
14%6%25%32335%6%46%
1728
February1st to 15thDay
16%5%25%334446%41%
1657
16th to endDay
16%7%25%5%3335%6%38%
1580
March1st to 15thDay
20%7%34423346%39%
1908
16th to endDay
16%6%36%5%35%45%6%36%
2170
April1st to 15thDay
11%7%245%23347%46%
2151
16th to endDay
15%6%25%43345%7%40%
2160
May1st to 15thDay
14%5%36%435%45%6%38%
2151
16th to endDay
9%6%26%5%36%5%7%8%38%
2585
June1st to 15thDay
5%315%435%5%7%10%48%
2520
16th to endDay
42145%35%6%7%10%46%
2520
July1st to 15thDay
6%426%6%47%6%7%9%38%
2484
16th to endDay
5%2134347%7%10%47%
2466
August1st to 15thDay
7%414435%5%6%10%45%
2229
16th to endDay
7%425%6%35%5%6%10%42%
2292
September1st to 15thDay
10%5%244345%5%8%45%
2160
16th to endDay
10%41442346%7%49%
1918
October1st to 15thDay
11%42432345%6%50%
1650
16th to endDay
15%313213345%56%
1760
November1st to 15thDay
11%6%15%31235%5%54%
1635
16th to endDay
18%6%2332333447%
1620
December1st to 15thDay
21%5%24323345%42%
1476
16th to endDay
20%6%3443424441%
1536
January1st to 15thNight
17%6%34312325%48%
2377
16th to endNight
15%43442343448%
2496
February1st to 15thNight
17%6%24313335%47%
2195
16th to endNight
15%415%423446%47%
1893
March1st to 15thNight
18%5%25%5%23345%42%
2061
16th to endNight
16%6%25%423347%43%
2051
April1st to 15thNight
10%32442345%8%51%
1797
16th to endNight
11%41442435%7%49%
1800
May1st to 15thNight
13%424423347%47%
1799
16th to endNight
7%5%35%5%345%6%8%45%
1525
June1st to 15thNight
322332347%9%55%
1440
16th to endNight
2223425%5%6%11%53%
1440
July1st to 15thNight
4324425%5%6%13%46%
1472
16th to endNight
421432436%10%56%
1702
August1st to 15thNight
22134245%6%10%54%
1731
16th to endNight
6%42343446%12%46%
1910
September1st to 15thNight
9%5%2342345%7%51%
1800
16th to endNight
8%414333446%54%
1822
October1st to 15thNight
9%414413447%54%
1980
16th to endNight
14%31332223458%
2112
November1st to 15thNight
10%413322347%55%
2220
16th to endNight
17%413323335%51%
2340
December1st to 15thNight
20%5%25%322246%44%
2483
16th to endNight
18%7%25%423335%44%
2688

Transparency (when cloud cover <= 30%)
Color Meanings:
Too cloudy to forecast Poor Below Average Average Above average Transparent
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 15thDay
39%49%27%15%4
1559
16th to endDay
39%412%25%15%2
1728
February1st to 15thDay
42%413%23%14%1
1659
16th to endDay
46%5%9%19%16%1
1580
March1st to 15thDay
45%411%19%14%4
1908
16th to endDay
46%6%13%23%9%
2172
April1st to 15thDay
38%410%23%19%3
2151
16th to endDay
42%5%8%23%17%1
2160
May1st to 15thDay
45%6%12%17%17%1
2151
16th to endDay
39%10%14%21%11%2
2589
June1st to 15thDay
28%8%14%29%17%1
2520
16th to endDay
28%8%13%26%19%2
2520
July1st to 15thDay
38%9%13%22%12%3
2338
16th to endDay
26%9%16%29%15%2
2311
August1st to 15thDay
31%8%15%26%16%3
2215
16th to endDay
33%8%15%24%14%4
2292
September1st to 15thDay
35%8%10%23%16%6%
2160
16th to endDay
32%5%9%23%23%5%
1918
October1st to 15thDay
33%5%9%19%22%8%
1650
16th to endDay
30%35%26%27%7%
1760
November1st to 15thDay
32%36%23%25%7%
1635
16th to endDay
41%37%22%21%3
1620
December1st to 15thDay
44%410%22%15%2
1476
16th to endDay
46%310%21%14%3
1536
January1st to 15thNight
40%27%23%22%4
2377
16th to endNight
39%37%24%20%3
2496
February1st to 15thNight
39%310%24%17%3
2204
16th to endNight
37%49%24%17%5%
1893
March1st to 15thNight
43%39%17%18%6%
2061
16th to endNight
41%411%22%18%1
2051
April1st to 15thNight
31%410%25%21%6%
1797
16th to endNight
33%410%24%22%3
1800
May1st to 15thNight
36%6%12%22%18%3
1800
16th to endNight
35%7%14%21%16%4
1527
June1st to 15thNight
22%6%14%30%24%2
1440
16th to endNight
24%6%13%26%24%5%
1440
July1st to 15thNight
26%8%18%27%15%4
1390
16th to endNight
22%7%19%31%17%2
1594
August1st to 15thNight
23%7%14%30%21%3
1721
16th to endNight
29%6%14%27%17%4
1910
September1st to 15thNight
31%6%9%26%17%9%
1800
16th to endNight
29%5%9%20%26%8%
1822
October1st to 15thNight
29%48%22%23%11%
1980
16th to endNight
30%26%19%30%9%
2112
November1st to 15thNight
29%37%24%26%8%
2220
16th to endNight
36%37%22%24%5%
2340
December1st to 15thNight
42%39%22%17%5%
2483
16th to endNight
43%39%21%19%3
2688

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
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 15thDay
31%8%37%12%6%3
90
16th to endDay
14%9%50%20%5%
96
February1st to 15thDay
18%15%44%16%22
90
16th to endDay
18%7%44%20%8%
81
March1st to 15thDay
27%12%27%24%7%
90
16th to endDay
16%10%26%30%16%
156
April1st to 15thDay
14%9%33%26%13%2
270
16th to endDay
19%5%28%28%12%5%
270
May1st to 15thDay
13%6%28%28%15%5%
288
16th to endDay
12%318%31%25%8%
487
June1st to 15thDay
7%10%30%29%21%
495
16th to endDay
5%212%28%35%15%
495
July1st to 15thDay
5%19%30%35%17%
475
16th to endDay
6%219%38%31%
515
August1st to 15thDay
10%424%37%22%
382
16th to endDay
12%6%20%39%21%
332
September1st to 15thDay
10%19%17%35%25%
315
16th to endDay
11%111%22%30%22%
270
October1st to 15thDay
10%318%43%18%5%
90
16th to endDay
18%221%29%23%4
96
November1st to 15thDay
11%424%32%22%5%
90
16th to endDay
36%8%27%14%11%1
90
December1st to 15thDay
22%5%34%17%15%4
90
16th to endDay
26%10%41%20%1
96
January1st to 15thNight
20%8%35%29%5%
900
16th to endNight
17%9%39%31%2
960
February1st to 15thNight
20%6%37%32%3
796
16th to endNight
18%9%41%27%3
631
March1st to 15thNight
20%7%34%32%4
621
16th to endNight
18%6%29%33%11%
576
April1st to 15thNight
12%443%29%10%
539
16th to endNight
13%5%33%33%13%
540
May1st to 15thNight
16%425%37%13%2
540
16th to endNight
9%119%38%26%3
563
June1st to 15thNight
4111%40%37%4
540
16th to endNight
311%39%41%3
540
July1st to 15thNight
5%26%35%42%7%
510
16th to endNight
5%325%49%14%
564
August1st to 15thNight
4427%52%10%
539
16th to endNight
8%5%30%48%7%
573
September1st to 15thNight
11%9%29%40%8%
540
16th to endNight
10%213%32%35%5%
618
October1st to 15thNight
12%219%33%27%5%
660
16th to endNight
15%323%37%18%1
704
November1st to 15thNight
12%5%27%34%18%1
700
16th to endNight
19%6%30%30%13%
720
December1st to 15thNight
23%6%27%33%7%1
863
16th to endNight
21%6%35%30%5%
960
Page generated at 2017-09-22 06:35:29. Version ac04

Copyright 2017 A. Danko


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