Jupiter
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Jupiter clear sky chart from 2005-11-06 to 2024-03-28.

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
63%
25252
10%
80335
9%
25162
65%
25162
13%
62285

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 10thNight
55%
749
13%
4037
10%
737
61%
737
10%
2758
January11th to 20thNight
49%
754
8%
4106
10%
740
54%
740
6%
3306
January21st to endNight
45%
826
8%
4461
9%
814
50%
814
8%
3109
February1st to 10thNight
54%
760
16%
2299
13%
760
58%
760
15%
1719
February11th to 20thNight
55%
740
16%
2103
10%
739
62%
739
19%
1552
February21st to endNight
61%
628
19%
1727
15%
628
64%
628
23%
1214
March1st to 10thNight
53%
760
17%
2090
11%
760
59%
760
21%
1536
March11th to 20thNight
64%
760
17%
2090
12%
760
69%
760
22%
1480
March21st to endNight
62%
821
19%
2256
15%
821
65%
821
22%
1603
April1st to 10thNight
69%
720
14%
1980
13%
720
70%
720
21%
1435
April11th to 20thNight
63%
711
13%
1838
8%
711
65%
711
18%
1399
April21st to endNight
66%
720
16%
1800
10%
720
68%
720
19%
1392
May1st to 10thNight
74%
720
16%
1800
11%
720
75%
720
26%
1292
May11th to 20thNight
67%
683
9%
1744
5%
683
68%
683
16%
1384
May21st to endNight
70%
582
7%
1744
6%
582
70%
582
12%
1436
June1st to 10thNight
63%
540
6%
1620
4%
540
63%
540
9%
1371
June11th to 20thNight
70%
540
7%
1620
6%
540
70%
540
13%
1305
June21st to endNight
74%
540
6%
1620
5%
540
74%
540
10%
1369
July1st to 10thNight
73%
525
3%
1575
3%
525
73%
525
8%
1348
July11th to 20thNight
80%
522
4%
1566
4%
522
80%
522
10%
1290
July21st to endNight
78%
591
5%
1672
5%
558
79%
558
12%
1361
August1st to 10thNight
77%
555
4%
1618
4%
552
77%
552
14%
1259
August11th to 20thNight
78%
710
5%
1774
4%
710
78%
710
14%
1455
August21st to endNight
66%
792
3%
2064
3%
792
66%
792
10%
1763
September1st to 10thNight
66%
720
4%
1980
4%
720
66%
720
10%
1661
September11th to 20thNight
67%
720
3%
1980
3%
720
67%
720
9%
1710
September21st to endNight
59%
720
6%
1980
6%
720
60%
720
8%
1725
October1st to 10thNight
63%
720
10%
2087
11%
720
63%
720
12%
1671
October11th to 20thNight
65%
720
11%
2160
10%
720
67%
720
13%
1697
October21st to endNight
60%
792
12%
2376
11%
792
63%
792
14%
1859
November1st to 10thNight
57%
740
13%
2221
11%
740
60%
740
13%
1717
November11th to 20thNight
55%
760
12%
2280
12%
760
57%
760
13%
1811
November21st to endNight
55%
760
11%
2280
9%
760
57%
760
13%
1798
December1st to 10thNight
62%
760
15%
2328
14%
760
66%
760
14%
1776
December11th to 20thNight
56%
760
10%
2979
10%
759
58%
759
8%
2335
December21st to endNight
55%
831
8%
4480
12%
817
60%
817
8%
3389

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
8%6%37%7%5%7%7%8%11%33%
79186
Night
8%6%36%6%46%6%7%10%38%
80816
TransparencyDay
28%41%11%12%7%1
78909
Night
28%39%11%13%7%2
80612
SeeingDay
7%315%28%29%18%
15091
Night
8%315%30%31%13%
25289

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 10thDay
10%8%46%7%47%5%5%7%39%
2836
11th to 20thDay
15%8%38%7%46%7%7%10%25%
2840
21st to endDay
8%6%49%9%5%6%6%6%6%35%
3124
February1st to 10thDay
10%6%26%5%35%6%7%11%38%
1876
11th to 20thDay
7%4245%35%5%8%10%48%
1961
21st to endDay
7%5%26%6%46%6%7%9%43%
1727
March1st to 10thDay
4426%6%46%7%7%10%42%
2090
11th to 20thDay
6%3245%47%6%6%9%47%
2090
21st to endDay
5%435%436%7%7%9%47%
2255
April1st to 10thDay
44247%36%6%7%11%45%
1980
11th to 20thDay
8%6%26%7%46%7%9%10%36%
2070
21st to endDay
6%4246%47%6%7%10%44%
2160
May1st to 10thDay
5%213435%5%9%12%51%
2160
11th to 20thDay
9%6%46%7%47%7%8%10%30%
2163
21st to endDay
10%6%37%7%5%8%7%8%12%28%
2531
June1st to 10thDay
13%8%49%8%5%8%8%10%10%17%
2340
11th to 20thDay
7%6%37%8%6%8%9%9%12%26%
2340
21st to endDay
7%6%27%9%5%8%9%9%12%26%
2340
July1st to 10thDay
7%7%47%8%5%9%9%11%13%21%
2340
11th to 20thDay
7%5%37%7%5%9%10%10%14%25%
2340
21st to endDay
6%5%36%8%6%9%9%10%12%25%
2547
August1st to 10thDay
7%6%37%7%6%7%9%10%14%25%
2292
11th to 20thDay
5%436%7%6%8%10%10%13%27%
2126
21st to endDay
9%5%39%8%5%8%8%9%13%23%
2285
September1st to 10thDay
7%6%37%9%6%8%10%10%13%21%
1980
11th to 20thDay
8%6%37%8%6%9%9%8%11%25%
1980
21st to endDay
9%8%410%9%6%8%8%8%8%22%
1980
October1st to 10thDay
8%7%28%8%6%7%7%8%11%27%
1872
11th to 20thDay
9%6%28%7%45%7%8%12%32%
1800
21st to endDay
12%5%36%6%46%7%7%11%33%
1980
November1st to 10thDay
8%5%36%7%47%7%8%10%37%
1857
11th to 20thDay
11%6%37%6%5%7%7%7%8%33%
1900
21st to endDay
9%6%35%6%46%7%6%11%38%
1900
December1st to 10thDay
10%6%36%6%5%5%6%6%10%38%
1847
11th to 20thDay
10%6%37%7%36%5%6%8%39%
2153
21st to endDay
12%7%48%7%46%7%8%10%28%
3124
January1st to 10thNight
7%7%37%7%46%6%6%10%38%
4109
11th to 20thNight
15%10%48%7%46%5%6%8%27%
4120
21st to endNight
8%6%38%7%47%7%6%9%35%
4532
February1st to 10thNight
8%6%36%5%35%5%7%10%43%
2299
11th to 20thNight
7%3245%445%5%9%53%
2103
21st to endNight
6%425%5%45%5%6%9%51%
1727
March1st to 10thNight
4426%6%445%6%8%52%
2090
11th to 20thNight
5%3244346%7%10%53%
2090
21st to endNight
4325%5%36%5%5%11%51%
2256
April1st to 10thNight
3324425%5%7%10%55%
1980
11th to 20thNight
5%336%7%46%7%7%10%44%
1838
21st to endNight
5%425%5%47%6%6%10%47%
1800
May1st to 10thNight
431442347%10%56%
1800
11th to 20thNight
8%5%35%6%46%7%8%11%37%
1744
21st to endNight
8%437%6%46%6%8%11%36%
1744
June1st to 10thNight
12%7%38%8%5%6%8%7%12%26%
1620
11th to 20thNight
6%6%47%9%47%7%8%12%30%
1620
21st to endNight
6%6%35%5%5%7%7%9%13%34%
1620
July1st to 10thNight
6%5%36%7%5%7%8%9%14%31%
1620
11th to 20thNight
5%426%6%5%8%8%10%13%34%
1620
21st to endNight
45%27%7%5%7%7%9%12%36%
1771
August1st to 10thNight
6%425%7%46%6%9%14%38%
1629
11th to 20thNight
4416%6%5%6%7%9%14%38%
1774
21st to endNight
6%6%37%9%5%7%9%9%13%26%
2064
September1st to 10thNight
8%5%37%7%48%9%10%14%25%
1980
11th to 20thNight
6%6%48%8%5%8%7%8%9%30%
1980
21st to endNight
9%7%39%9%47%9%9%11%23%
1980
October1st to 10thNight
9%6%36%8%47%7%8%10%31%
2087
11th to 20thNight
8%6%26%6%46%6%8%10%38%
2160
21st to endNight
11%5%26%6%5%6%5%8%9%38%
2376
November1st to 10thNight
9%6%36%6%46%7%7%9%38%
2221
11th to 20thNight
9%6%36%7%5%7%6%7%10%36%
2280
21st to endNight
9%7%46%7%36%6%7%9%37%
2280
December1st to 10thNight
7%436%6%35%5%6%10%45%
2328
11th to 20thNight
12%8%37%5%35%45%8%39%
3042
21st to endNight
10%9%48%7%46%7%7%8%29%
4532

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 10thDay
33%28%5%14%18%1
2837
11th to 20thDay
43%31%9%11%42
2840
21st to endDay
36%27%7%15%11%3
3124
February1st to 10thDay
26%37%7%15%12%4
1876
11th to 20thDay
21%39%11%17%9%4
1971
21st to endDay
20%37%10%14%15%5%
1727
March1st to 10thDay
21%39%10%17%12%2
2090
11th to 20thDay
19%39%10%20%9%3
2090
21st to endDay
18%39%10%20%12%2
2255
April1st to 10thDay
20%41%11%15%11%2
1980
11th to 20thDay
24%40%13%13%9%1
2070
21st to endDay
22%40%9%13%13%2
2160
May1st to 10thDay
12%39%15%20%14%1
2160
11th to 20thDay
28%43%12%12%5%
2167
21st to endDay
30%45%12%10%3
2531
June1st to 10thDay
37%43%11%7%2
2340
11th to 20thDay
27%43%15%14%1
2340
21st to endDay
34%44%13%8%1
2340
July1st to 10thDay
32%48%14%5%1
2275
11th to 20thDay
28%49%15%7%
2271
21st to endDay
27%49%15%10%
2405
August1st to 10thDay
26%48%19%7%
2279
11th to 20thDay
27%47%18%8%
2126
21st to endDay
31%48%14%6%1
2285
September1st to 10thDay
28%48%15%8%1
1980
11th to 20thDay
31%47%13%8%1
1980
21st to endDay
37%44%9%6%41
1980
October1st to 10thDay
27%43%11%11%6%1
1872
11th to 20thDay
27%40%13%13%6%1
1800
21st to endDay
27%40%8%13%11%2
1980
November1st to 10thDay
23%43%7%10%12%6%
1857
11th to 20thDay
27%43%9%12%8%2
1900
21st to endDay
23%44%10%11%11%1
1900
December1st to 10thDay
25%43%9%13%9%2
1847
11th to 20thDay
33%35%6%11%11%4
2150
21st to endDay
36%31%9%10%11%3
3124
January1st to 10thNight
30%30%9%18%11%2
4109
11th to 20thNight
45%29%8%10%6%1
4120
21st to endNight
34%28%10%16%6%5%
4532
February1st to 10thNight
25%37%8%15%11%4
2299
11th to 20thNight
22%38%10%19%9%3
2104
21st to endNight
17%37%11%16%15%4
1727
March1st to 10thNight
20%38%8%18%13%4
2090
11th to 20thNight
16%39%13%21%9%3
2090
21st to endNight
18%37%9%21%12%3
2256
April1st to 10thNight
17%40%14%16%11%3
1980
11th to 20thNight
22%40%11%16%11%
1838
21st to endNight
23%40%8%16%12%2
1800
May1st to 10thNight
15%38%10%25%12%1
1800
11th to 20thNight
23%43%12%15%6%
1745
21st to endNight
29%43%13%11%3
1745
June1st to 10thNight
33%43%11%9%3
1620
11th to 20thNight
27%43%16%12%1
1620
21st to endNight
31%44%15%9%1
1620
July1st to 10thNight
32%46%15%6%1
1575
11th to 20thNight
27%46%19%7%
1566
21st to endNight
24%48%18%10%1
1672
August1st to 10thNight
22%44%23%10%
1618
11th to 20thNight
24%45%22%8%
1774
21st to endNight
30%46%16%6%2
2064
September1st to 10thNight
30%45%16%8%1
1980
11th to 20thNight
34%44%12%8%1
1980
21st to endNight
37%43%10%7%3
1980
October1st to 10thNight
28%42%10%13%6%1
2087
11th to 20thNight
28%40%11%13%8%1
2160
21st to endNight
27%40%9%12%10%2
2376
November1st to 10thNight
24%43%7%10%11%5%
2221
11th to 20thNight
26%43%8%12%9%1
2280
21st to endNight
25%43%11%11%9%1
2280
December1st to 10thNight
22%43%9%16%8%2
2328
11th to 20thNight
34%36%8%10%7%6%
3044
21st to endNight
37%31%9%9%10%4
4532

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 10thDay
8%9%30%41%11%1
270
11th to 20thDay
10%436%30%17%2
270
21st to endDay
11%9%37%32%10%
297
February1st to 10thDay
6%9%27%41%16%1
270
11th to 20thDay
7%426%38%21%4
384
21st to endDay
6%422%38%29%1
382
March1st to 10thDay
5%6%34%37%18%1
460
11th to 20thDay
6%5%26%38%23%2
460
21st to endDay
4325%42%22%3
490
April1st to 10thDay
4331%39%19%4
420
11th to 20thDay
7%5%23%39%23%3
412
21st to endDay
6%316%44%28%5%
420
May1st to 10thDay
4113%42%30%10%
423
11th to 20thDay
10%214%31%32%11%
447
21st to endDay
11%18%20%40%20%
485
June1st to 10thDay
11%210%24%33%20%
450
11th to 20thDay
7%2315%38%35%
450
21st to endDay
3139%38%46%
450
July1st to 10thDay
4118%36%49%
445
11th to 20thDay
437%39%48%
444
21st to endDay
5%312%38%42%
488
August1st to 10thDay
6%1412%33%45%
446
11th to 20thDay
328%39%47%
439
21st to endDay
8%1415%37%35%
495
September1st to 10thDay
7%1312%33%43%
450
11th to 20thDay
6%1416%36%36%
450
21st to endDay
8%26%19%39%26%
450
October1st to 10thDay
11%37%35%35%10%
450
11th to 20thDay
10%314%31%32%10%
450
21st to endDay
9%314%34%32%7%
495
November1st to 10thDay
8%320%33%29%7%
455
11th to 20thDay
12%323%35%22%5%
460
21st to endDay
7%324%39%23%3
460
December1st to 10thDay
9%5%18%40%25%3
407
11th to 20thDay
10%5%18%39%25%3
270
21st to endDay
7%8%22%40%21%3
297
January1st to 10thNight
10%6%22%36%24%2
760
11th to 20thNight
10%7%26%35%21%1
760
21st to endNight
9%6%31%39%13%1
836
February1st to 10thNight
9%6%24%40%20%1
760
11th to 20thNight
9%5%25%39%21%1
743
21st to endNight
8%323%44%21%
628
March1st to 10thNight
5%431%40%19%1
760
11th to 20thNight
7%123%42%24%2
760
21st to endNight
5%422%43%24%1
821
April1st to 10thNight
5%218%46%27%2
720
11th to 20thNight
5%420%45%24%1
711
21st to endNight
5%218%47%27%1
720
May1st to 10thNight
6%211%43%36%2
720
11th to 20thNight
8%112%39%34%5%
683
21st to endNight
8%27%23%47%14%
584
June1st to 10thNight
13%16%19%46%14%
540
11th to 20thNight
7%1414%44%30%
540
21st to endNight
6%15%11%38%39%
540
July1st to 10thNight
6%129%42%40%
525
11th to 20thNight
5%127%40%45%
522
21st to endNight
6%28%40%44%
591
August1st to 10thNight
7%1310%42%37%
555
11th to 20thNight
5%117%46%39%
710
21st to endNight
9%1414%38%34%
792
September1st to 10thNight
10%149%39%36%
720
11th to 20thNight
8%2315%38%34%
720
21st to endNight
13%26%16%40%23%
720
October1st to 10thNight
12%27%28%39%11%
720
11th to 20thNight
10%210%30%39%10%
720
21st to endNight
13%214%32%31%7%
792
November1st to 10thNight
10%419%30%32%5%
740
11th to 20thNight
10%322%33%29%3
760
21st to endNight
12%419%40%24%1
760
December1st to 10thNight
7%417%37%31%4
760
11th to 20thNight
13%420%34%26%4
760
21st to endNight
10%423%33%28%3
836
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