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 2018-02-22.

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%
16880
16%
48849
12%
16842
59%
16842
22%
32807

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
41%
777
15%
2522
9%
776
49%
776
19%
1644
January16th to endNight
42%
832
19%
2704
15%
832
50%
832
21%
1701
February1st to 15thNight
49%
761
23%
2288
18%
760
56%
760
28%
1385
February16th to endNight
50%
659
27%
1812
15%
659
61%
659
29%
1104
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
70%
611
7%
1681
6%
608
70%
608
25%
1144
August16th to endNight
61%
764
5%
1967
4%
764
62%
764
17%
1536
September1st to 15thNight
62%
720
4%
1980
4%
720
62%
720
15%
1547
September16th to endNight
53%
717
6%
1980
3%
717
56%
717
11%
1586
October1st to 15thNight
58%
720
16%
2112
17%
720
59%
720
20%
1475
October16th to endNight
50%
768
16%
2304
13%
768
55%
768
20%
1597
November1st to 15thNight
52%
760
18%
2281
16%
760
56%
760
22%
1517
November16th to endNight
44%
780
20%
2340
15%
780
52%
780
19%
1620
December1st to 15thNight
51%
780
21%
2438
17%
780
57%
780
22%
1582
December16th to endNight
54%
832
20%
2704
18%
832
60%
832
23%
1677

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%7%10%30%
49392
Night
7%5%25%6%36%6%7%10%37%
49051
TransparencyDay
42%13%16%16%9%2
49093
Night
39%10%17%18%10%2
48854
SeeingDay
8%8%11%22%26%20%
6623
Night
8%15%11%24%27%12%
16889

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
11%5%36%8%47%6%6%8%32%
1746
16th to endDay
9%436%5%46%6%6%9%36%
1872
February1st to 15thDay
10%6%25%6%346%6%9%38%
1896
16th to endDay
7%5%16%5%26%5%7%8%42%
1808
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%5%37%7%5%7%9%9%12%23%
2255
16th to endDay
10%5%38%8%6%8%8%8%11%21%
2231
September1st to 15thDay
8%6%37%9%5%9%8%9%11%19%
1980
16th to endDay
9%8%49%9%7%8%8%8%8%17%
1980
October1st to 15thDay
8%7%28%8%5%6%7%7%10%25%
1848
16th to endDay
15%5%37%6%5%6%6%7%9%27%
1920
November1st to 15thDay
8%436%7%47%5%6%7%36%
1907
16th to endDay
11%5%26%7%46%7%6%8%33%
1950
December1st to 15thDay
11%7%36%6%46%5%48%34%
1849
16th to endDay
7%5%36%5%36%5%8%10%37%
1872
January1st to 15thNight
9%6%35%6%35%5%6%10%37%
2522
16th to endNight
7%416%5%36%6%6%9%40%
2704
February1st to 15thNight
8%42442446%9%46%
2282
16th to endNight
5%3145%35%5%6%10%47%
1812
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%38%
1692
16th to endNight
7%6%26%8%5%7%8%8%12%26%
1967
September1st to 15thNight
7%5%37%7%5%7%8%10%13%22%
1980
16th to endNight
9%7%39%9%47%8%8%9%22%
1980
October1st to 15thNight
8%5%26%7%38%7%8%10%30%
2112
16th to endNight
13%5%26%6%5%5%5%7%7%34%
2304
November1st to 15thNight
8%5%25%6%47%6%7%8%36%
2281
16th to endNight
10%7%36%6%35%5%7%7%35%
2340
December1st to 15thNight
8%5%35%6%35%46%8%40%
2438
16th to endNight
7%5%25%5%35%6%7%11%39%
2704

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%9%12%16%13%2
1747
16th to endDay
40%8%12%19%14%5%
1872
February1st to 15thDay
38%7%14%19%14%5%
1898
16th to endDay
34%8%14%22%14%5%
1808
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
41%21%25%11%
2242
16th to endDay
48%19%21%10%
2231
September1st to 15thDay
47%22%19%8%1
1980
16th to endDay
54%18%16%7%3
1980
October1st to 15thDay
45%12%15%15%10%1
1848
16th to endDay
47%8%13%12%12%5%
1920
November1st to 15thDay
41%8%12%18%14%4
1907
16th to endDay
43%9%11%13%15%6%
1950
December1st to 15thDay
46%7%12%16%12%3
1849
16th to endDay
37%8%14%21%14%3
1872
January1st to 15thNight
41%8%16%20%11%2
2522
16th to endNight
38%8%15%19%12%5%
2704
February1st to 15thNight
33%7%13%23%16%5%
2291
16th to endNight
31%7%15%23%17%4
1812
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
34%15%34%15%
1681
16th to endNight
46%17%24%11%
1967
September1st to 15thNight
46%19%23%9%1
1980
16th to endNight
52%16%18%9%2
1980
October1st to 15thNight
43%11%16%16%11%1
2112
16th to endNight
46%7%12%15%13%4
2304
November1st to 15thNight
41%8%12%17%14%4
2281
16th to endNight
45%8%11%15%13%5%
2340
December1st to 15thNight
41%6%13%19%14%4
2438
16th to endNight
37%8%16%21%13%3
2704

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%7%36%26%11%
135
16th to endDay
15%6%34%31%10%1
144
February1st to 15thDay
3329%39%21%3
148
16th to endDay
9%12%22%30%23%3
265
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%5%27%30%46%
313
16th to endDay
11%5%310%26%41%
332
September1st to 15thDay
7%5%311%27%44%
315
16th to endDay
12%5%212%32%35%
314
October1st to 15thDay
12%6%6%28%33%12%
315
16th to endDay
16%8%17%28%21%7%
336
November1st to 15thDay
10%8%12%31%28%8%
325
16th to endDay
9%11%20%35%20%2
330
December1st to 15thDay
16%8%13%36%21%3
229
16th to endDay
49%46%34%4
144
January1st to 15thNight
12%19%20%25%20%1
780
16th to endNight
8%19%23%32%14%
832
February1st to 15thNight
8%16%19%35%18%1
764
16th to endNight
8%17%19%35%18%
659
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%16%39%35%
611
16th to endNight
10%9%310%32%34%
764
September1st to 15thNight
9%8%29%36%33%
720
16th to endNight
13%9%313%33%27%
717
October1st to 15thNight
12%8%7%24%36%11%
720
16th to endNight
16%9%11%26%27%8%
768
November1st to 15thNight
9%14%15%28%27%4
760
16th to endNight
12%17%16%30%20%2
780
December1st to 15thNight
8%17%15%31%24%2
780
16th to endNight
7%17%13%27%29%4
832
Page generated at 2018-02-23 11:21:34. Version ac04

Copyright 2018 A. Danko


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