Jupiter
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Jupiter clear sky chart from 2005-11-05 to 2017-08-12.

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
54%
16101
16%
46533
12%
16063
59%
16063
22%
31289

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
42%
717
15%
2327
9%
716
50%
716
19%
1512
January16th to endNight
43%
768
20%
2496
15%
768
51%
768
22%
1539
February1st to 15thNight
46%
701
23%
2108
18%
700
54%
700
27%
1285
February16th to endNight
48%
631
25%
1735
13%
631
60%
631
28%
1067
March1st to 15thNight
45%
720
24%
1980
14%
720
55%
720
30%
1215
March16th to endNight
51%
768
23%
2112
15%
768
58%
768
29%
1292
April1st to 15thNight
59%
718
22%
1958
15%
718
64%
718
34%
1128
April16th to endNight
54%
720
22%
1800
11%
720
59%
720
28%
1168
May1st to 15thNight
63%
719
21%
1800
13%
719
65%
719
37%
1100
May16th to endNight
61%
600
16%
1721
12%
600
63%
600
22%
1184
June1st to 15thNight
53%
540
8%
1620
5%
540
54%
540
14%
1231
June16th to endNight
64%
540
10%
1620
8%
540
64%
540
20%
1157
July1st to 15thNight
67%
510
5%
1530
5%
510
67%
510
17%
1140
July16th to endNight
66%
564
9%
1595
8%
531
71%
531
24%
1077
August1st to 15thNight
69%
596
7%
1644
6%
593
69%
593
24%
1123
August16th to endNight
61%
700
4%
1802
3%
700
62%
700
17%
1412
September1st to 15thNight
61%
660
4%
1815
3%
660
61%
660
15%
1423
September16th to endNight
52%
657
5%
1815
2%
657
55%
657
11%
1469
October1st to 15thNight
58%
660
17%
1936
18%
660
59%
660
20%
1340
October16th to endNight
50%
704
16%
2112
13%
704
55%
704
20%
1454
November1st to 15thNight
51%
700
20%
2101
17%
700
56%
700
22%
1396
November16th to endNight
42%
720
19%
2160
13%
720
50%
720
18%
1507
December1st to 15thNight
49%
720
19%
2250
16%
720
55%
720
20%
1496
December16th to endNight
52%
768
18%
2496
16%
768
58%
768
21%
1574

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%5%37%7%47%7%8%10%29%
47428
Night
7%5%25%6%36%6%7%10%37%
46735
TransparencyDay
42%13%16%15%9%2
47129
Night
39%10%17%18%10%2
46538
SeeingDay
8%9%11%21%26%22%
5914
Night
8%16%11%24%27%12%
16110

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
10%5%36%8%47%6%6%7%31%
1611
16th to endDay
10%436%6%36%5%6%8%37%
1728
February1st to 15thDay
11%6%25%5%346%7%8%37%
1746
16th to endDay
7%5%16%5%26%5%7%8%41%
1738
March1st to 15thDay
5%425%6%46%7%7%9%39%
1980
16th to endDay
7%426%5%36%7%7%8%40%
2111
April1st to 15thDay
5%415%6%35%6%8%11%40%
1990
16th to endDay
6%415%6%47%6%7%10%37%
2160
May1st to 15thDay
5%2145%46%5%9%10%44%
2152
16th to endDay
9%6%37%7%5%8%8%8%11%23%
2400
June1st to 15thDay
12%8%38%7%5%7%8%7%10%19%
2340
16th to endDay
7%5%27%8%5%8%9%8%11%22%
2340
July1st to 15thDay
8%6%38%8%5%9%9%10%11%19%
2340
16th to endDay
8%5%36%8%6%9%8%9%12%21%
2465
August1st to 15thDay
7%6%38%7%5%7%9%9%12%22%
2207
16th to endDay
10%5%38%8%6%8%8%8%11%19%
2044
September1st to 15thDay
8%6%38%9%5%9%8%9%11%18%
1815
16th to endDay
10%8%49%8%6%8%8%8%8%16%
1815
October1st to 15thDay
7%6%28%8%5%6%7%7%10%26%
1694
16th to endDay
15%5%37%6%46%6%7%9%27%
1760
November1st to 15thDay
8%5%36%7%37%5%6%7%36%
1757
16th to endDay
11%5%26%7%5%6%7%6%8%32%
1800
December1st to 15thDay
12%8%36%7%46%5%48%31%
1707
16th to endDay
8%5%37%5%36%5%7%10%35%
1728
January1st to 15thNight
8%6%35%6%35%5%6%10%37%
2327
16th to endNight
7%316%5%36%6%5%10%42%
2496
February1st to 15thNight
8%5%35%42446%8%46%
2102
16th to endNight
5%3245%35%5%6%10%46%
1735
March1st to 15thNight
4315%5%446%6%8%49%
1980
16th to endNight
4325%5%36%6%5%9%47%
2112
April1st to 15thNight
3224425%5%7%10%52%
1958
16th to endNight
5%325%5%36%5%6%10%44%
1800
May1st to 15thNight
43144345%6%10%51%
1799
16th to endNight
8%426%6%36%7%9%12%33%
1721
June1st to 15thNight
11%7%28%8%36%6%7%12%24%
1620
16th to endNight
5%435%6%47%6%9%12%33%
1620
July1st to 15thNight
6%437%6%5%8%7%7%13%29%
1620
16th to endNight
5%5%25%6%46%6%9%11%36%
1703
August1st to 15thNight
5%426%6%45%5%8%12%37%
1655
16th to endNight
7%6%26%8%5%7%9%8%11%26%
1802
September1st to 15thNight
7%5%37%7%5%7%8%10%13%22%
1815
16th to endNight
9%7%39%9%47%8%9%10%20%
1815
October1st to 15thNight
8%5%26%7%38%7%8%9%32%
1936
16th to endNight
13%5%26%6%5%5%5%6%7%34%
2112
November1st to 15thNight
8%5%25%6%46%6%6%8%37%
2101
16th to endNight
10%7%46%6%35%5%7%7%34%
2160
December1st to 15thNight
9%5%36%6%35%46%9%37%
2250
16th to endNight
8%5%25%5%35%6%7%10%38%
2496

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
44%10%13%15%13%2
1612
16th to endDay
40%8%11%19%15%5%
1728
February1st to 15thDay
39%7%12%18%16%5%
1748
16th to endDay
34%9%15%22%13%5%
1738
March1st to 15thDay
34%8%14%26%13%2
1980
16th to endDay
35%9%14%20%15%4
2112
April1st to 15thDay
31%9%18%22%15%2
1990
16th to endDay
34%10%15%18%18%2
2160
May1st to 15thDay
28%9%18%22%15%5%
2152
16th to endDay
44%15%17%15%6%
2404
June1st to 15thDay
52%13%17%12%3
2340
16th to endDay
45%17%21%14%1
2340
July1st to 15thDay
46%22%19%10%
2201
16th to endDay
43%20%23%12%
2310
August1st to 15thDay
42%21%25%10%
2194
16th to endDay
48%20%21%9%
2044
September1st to 15thDay
48%22%18%8%1
1815
16th to endDay
55%18%15%7%3
1815
October1st to 15thDay
44%12%15%15%11%1
1694
16th to endDay
47%8%13%13%12%4
1760
November1st to 15thDay
42%8%11%18%14%4
1757
16th to endDay
44%9%11%12%15%6%
1800
December1st to 15thDay
48%8%12%15%12%3
1707
16th to endDay
40%8%13%19%15%3
1728
January1st to 15thNight
40%8%16%20%11%2
2327
16th to endNight
36%8%15%20%13%6%
2496
February1st to 15thNight
34%6%11%22%17%6%
2111
16th to endNight
32%7%16%23%16%4
1735
March1st to 15thNight
30%7%14%27%15%4
1980
16th to endNight
31%8%14%23%17%5%
2112
April1st to 15thNight
24%9%20%26%16%3
1958
16th to endNight
33%8%14%22%18%3
1800
May1st to 15thNight
26%8%14%30%13%5%
1800
16th to endNight
38%12%17%23%7%
1723
June1st to 15thNight
49%13%18%14%4
1620
16th to endNight
40%15%27%15%1
1620
July1st to 15thNight
44%17%26%11%
1530
16th to endNight
34%15%32%16%1
1595
August1st to 15thNight
35%15%34%14%
1644
16th to endNight
46%17%24%10%
1802
September1st to 15thNight
47%19%23%8%1
1815
16th to endNight
53%16%17%9%1
1815
October1st to 15thNight
42%10%16%16%12%1
1936
16th to endNight
46%6%13%16%13%3
2112
November1st to 15thNight
42%7%11%17%15%5%
2101
16th to endNight
46%8%11%15%13%6%
2160
December1st to 15thNight
44%6%14%19%12%2
2250
16th to endNight
38%8%15%19%14%3
2496

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
17%8%27%27%16%1
90
16th to endDay
20%9%26%30%11%2
96
February1st to 15thDay
4431%33%21%3
102
16th to endDay
9%13%24%32%19%
239
March1st to 15thDay
5%12%27%32%19%1
270
16th to endDay
7%14%19%32%20%4
288
April1st to 15thDay
412%21%32%21%6%
270
16th to endDay
8%11%15%29%29%5%
270
May1st to 15thDay
411%9%28%31%13%
288
16th to endDay
6%9%5%18%35%24%
331
June1st to 15thDay
10%10%6%13%30%27%
315
16th to endDay
49%17%27%48%
315
July1st to 15thDay
46%15%30%51%
305
16th to endDay
5%9%17%30%46%
326
August1st to 15thDay
7%6%37%30%45%
297
16th to endDay
10%6%27%26%46%
268
September1st to 15thDay
6%5%212%25%46%
255
16th to endDay
13%6%29%28%39%
254
October1st to 15thDay
9%7%6%27%34%14%
255
16th to endDay
18%9%14%26%23%8%
272
November1st to 15thDay
10%9%12%28%27%9%
265
16th to endDay
9%13%20%32%21%2
270
December1st to 15thDay
19%10%12%34%19%3
177
16th to endDay
5%19%51%30%3
96
January1st to 15thNight
11%20%18%26%22%1
720
16th to endNight
7%20%22%32%14%
768
February1st to 15thNight
8%18%20%33%17%1
704
16th to endNight
8%18%20%36%16%
631
March1st to 15thNight
6%18%22%29%20%2
720
16th to endNight
5%19%17%32%22%1
768
April1st to 15thNight
317%14%36%24%2
718
16th to endNight
6%17%12%37%24%1
720
May1st to 15thNight
5%17%6%35%32%2
720
16th to endNight
6%17%321%37%12%
602
June1st to 15thNight
10%17%214%34%20%
540
16th to endNight
5%16%28%33%33%
540
July1st to 15thNight
6%11%16%37%35%
510
16th to endNight
5%16%16%31%39%
564
August1st to 15thNight
7%9%17%39%35%
596
16th to endNight
10%9%29%32%36%
700
September1st to 15thNight
9%9%19%36%33%
660
16th to endNight
13%9%312%31%27%
657
October1st to 15thNight
11%9%7%23%35%12%
660
16th to endNight
16%10%10%25%28%8%
704
November1st to 15thNight
9%15%15%29%26%4
700
16th to endNight
12%18%16%29%20%2
720
December1st to 15thNight
8%19%14%31%24%2
720
16th to endNight
7%18%14%27%27%4
768
Page generated at 2017-08-13 14:16:40. Version ac04

Copyright 2017 A. Danko


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