Jackson (WI)
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Jackson (WI) clear sky chart from 2005-11-06 to 2024-01-14.

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
35%
24712
17%
74659
10%
24657
43%
24657
23%
49658

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
19%
950
15%
2648
4%
946
29%
946
17%
1902
January11th to 20thNight
17%
920
13%
2575
4%
920
26%
920
14%
1955
January21st to endNight
20%
990
13%
2768
3%
990
28%
990
17%
2038
February1st to 10thNight
20%
900
13%
2340
2%
900
28%
900
18%
1706
February11th to 20thNight
22%
705
20%
2103
7%
704
34%
704
19%
1397
February21st to endNight
17%
592
18%
1776
3%
592
30%
592
18%
1225
March1st to 10thNight
26%
720
15%
2160
7%
720
33%
720
19%
1464
March11th to 20thNight
31%
700
20%
2120
11%
700
40%
700
26%
1322
March21st to endNight
36%
594
17%
1980
13%
594
43%
594
19%
1367
April1st to 10thNight
28%
540
15%
1800
9%
540
39%
540
19%
1214
April11th to 20thNight
31%
533
20%
1775
14%
533
41%
533
19%
1188
April21st to endNight
37%
540
17%
1674
10%
540
46%
540
24%
1105
May1st to 10thNight
37%
540
15%
1610
10%
540
41%
540
23%
1104
May11th to 20thNight
39%
531
19%
1416
10%
531
46%
531
26%
954
May21st to endNight
50%
583
15%
1552
9%
582
54%
582
30%
1027
June1st to 10thNight
53%
540
15%
1440
9%
540
58%
540
37%
886
June11th to 20thNight
49%
540
18%
1440
10%
540
53%
540
35%
918
June21st to endNight
53%
540
17%
1440
10%
540
57%
540
36%
897
July1st to 10thNight
69%
525
17%
1400
12%
525
71%
525
45%
805
July11th to 20thNight
63%
522
21%
1392
14%
522
67%
522
42%
802
July21st to endNight
64%
591
21%
1487
15%
558
68%
558
43%
859
August1st to 10thNight
66%
537
23%
1423
18%
534
69%
534
41%
848
August11th to 20thNight
66%
534
21%
1716
19%
534
71%
534
37%
932
August21st to endNight
62%
594
23%
1980
23%
594
67%
594
34%
1098
September1st to 10thNight
58%
540
24%
1800
22%
540
64%
540
33%
1006
September11th to 20thNight
58%
627
30%
1887
25%
627
64%
627
37%
1078
September21st to endNight
45%
720
24%
1980
15%
720
51%
720
31%
1242
October1st to 10thNight
42%
720
22%
2045
15%
720
48%
720
30%
1283
October11th to 20thNight
31%
720
19%
2190
9%
720
41%
720
24%
1420
October21st to endNight
29%
792
16%
2574
9%
792
37%
792
19%
1731
November1st to 10thNight
32%
740
25%
2406
15%
740
46%
740
25%
1449
November11th to 20thNight
22%
760
18%
2470
8%
760
34%
760
17%
1656
November21st to endNight
22%
895
18%
2605
6%
895
33%
895
20%
1774
December1st to 10thNight
20%
950
13%
2660
4%
950
28%
950
17%
1910
December11th to 20thNight
18%
950
12%
3210
2%
948
27%
948
12%
2345
December21st to endNight
13%
1037
7%
4817
2%
1026
22%
1026
7%
3751

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
13%8%47%6%35%5%6%8%37%
74811
Night
13%8%36%5%345%5%7%39%
74978
TransparencyDay
45%5%13%23%12%1
74512
Night
45%5%12%23%13%2
74798
SeeingDay
16%11%30%27%13%4
14729
Night
18%10%31%28%12%1
24723

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
12%11%6%7%5%35%5%5%7%33%
1517
11th to 20thDay
12%16%6%11%8%345%5%6%24%
1464
21st to endDay
11%15%7%10%6%35%5%6%7%25%
1584
February1st to 10thDay
11%12%8%8%6%245%5%7%32%
1620
11th to 20thDay
14%10%48%435%5%5%5%36%
1743
21st to endDay
12%14%49%6%45%5%5%7%29%
1480
March1st to 10thDay
13%11%5%7%6%35%5%6%7%34%
1800
11th to 20thDay
11%9%47%5%45%5%5%7%38%
1855
21st to endDay
18%11%47%6%35%45%6%30%
2376
April1st to 10thDay
17%11%5%6%6%345%5%6%31%
2160
11th to 20thDay
16%9%47%6%45%46%6%34%
2134
21st to endDay
18%10%36%5%345%6%7%32%
2286
May1st to 10thDay
16%8%46%6%45%5%6%9%31%
2348
11th to 20thDay
17%6%36%6%45%46%7%37%
2479
21st to endDay
13%7%36%5%35%5%6%9%39%
2725
June1st to 10thDay
9%5%35%6%35%5%6%8%45%
2520
11th to 20thDay
11%6%26%5%345%7%9%43%
2520
21st to endDay
9%5%26%5%35%6%7%10%43%
2520
July1st to 10thDay
6%425%5%35%6%7%9%48%
2520
11th to 20thDay
8%425%5%35%5%6%9%47%
2520
21st to endDay
6%425%435%6%8%10%47%
2743
August1st to 10thDay
7%426%5%46%7%8%10%42%
2507
11th to 20thDay
10%5%26%6%345%7%9%43%
2181
21st to endDay
10%6%25%5%345%6%9%43%
2376
September1st to 10thDay
11%6%36%7%346%5%7%43%
2160
11th to 20thDay
12%5%25%435%45%8%47%
2053
21st to endDay
13%7%25%6%35%5%5%7%42%
1980
October1st to 10thDay
14%7%26%5%3445%8%42%
1913
11th to 20thDay
21%8%46%5%346%6%8%30%
1769
21st to endDay
17%8%46%6%345%46%35%
1782
November1st to 10thDay
11%8%37%5%3435%7%43%
1672
11th to 20thDay
10%10%48%7%5%5%5%5%8%33%
1710
21st to endDay
16%11%45%5%44446%37%
1573
December1st to 10thDay
14%11%48%7%4445%8%31%
1520
11th to 20thDay
12%12%5%7%6%45%5%7%7%31%
1918
21st to endDay
19%18%8%12%6%34345%19%
2783
January1st to 10thNight
13%12%6%8%5%3444436%
2648
11th to 20thNight
15%12%5%10%7%45%446%28%
2575
21st to endNight
12%11%5%9%6%45%5%6%8%28%
2768
February1st to 10thNight
12%13%48%6%345%5%6%34%
2340
11th to 20thNight
12%8%47%6%36%5%5%6%39%
2102
21st to endNight
18%11%46%5%2445%7%35%
1776
March1st to 10thNight
15%9%36%5%35%5%5%7%36%
2160
11th to 20thNight
12%6%35%5%345%5%9%42%
2120
21st to endNight
18%9%37%5%35%6%5%6%33%
1980
April1st to 10thNight
16%9%36%6%35%45%7%36%
1800
11th to 20thNight
20%8%35%5%24446%37%
1775
21st to endNight
16%8%36%435%5%6%7%39%
1674
May1st to 10thNight
15%8%47%6%345%6%9%33%
1610
11th to 20thNight
16%7%26%5%345%6%8%38%
1416
21st to endNight
11%5%35%6%346%6%10%41%
1551
June1st to 10thNight
10%424445%5%6%9%47%
1440
11th to 20thNight
12%5%25%4346%5%9%44%
1440
21st to endNight
8%5%26%5%35%45%7%49%
1440
July1st to 10thNight
7%3244235%6%10%53%
1440
11th to 20thNight
5%3244446%7%8%53%
1440
21st to endNight
6%414435%6%6%9%53%
1575
August1st to 10thNight
6%425%435%5%6%9%50%
1432
11th to 20thNight
8%32443445%9%54%
1716
21st to endNight
8%425%5%3446%7%52%
1980
September1st to 10thNight
9%5%25%424447%54%
1800
11th to 20thNight
11%3144345%46%55%
1887
21st to endNight
12%7%36%5%33448%47%
1980
October1st to 10thNight
14%6%35%433446%47%
2045
11th to 20thNight
17%7%35%5%34447%42%
2190
21st to endNight
18%8%45%5%35%46%7%35%
2574
November1st to 10thNight
12%7%35%4345%5%7%47%
2406
11th to 20thNight
14%8%36%6%46%47%7%35%
2470
21st to endNight
16%8%35%6%3445%7%38%
2605
December1st to 10thNight
14%11%47%6%35%45%7%33%
2660
11th to 20thNight
13%13%47%7%36%5%5%6%30%
3279
21st to endNight
20%17%6%8%6%34446%22%
4884

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
50%5%14%19%11%1
1518
11th to 20thDay
61%5%9%18%7%
1464
21st to endDay
59%5%12%15%8%1
1584
February1st to 10thDay
52%5%13%20%9%1
1620
11th to 20thDay
49%5%10%23%12%2
1753
21st to endDay
55%49%18%11%2
1480
March1st to 10thDay
50%7%11%22%8%2
1800
11th to 20thDay
46%5%12%21%14%2
1855
21st to endDay
55%5%13%19%7%1
2376
April1st to 10thDay
54%5%11%19%11%1
2160
11th to 20thDay
50%5%10%19%13%3
2134
21st to endDay
50%6%12%19%11%2
2286
May1st to 10thDay
49%6%12%24%9%
2348
11th to 20thDay
46%6%12%23%11%2
2483
21st to endDay
41%7%13%23%14%2
2725
June1st to 10thDay
36%5%14%27%16%2
2520
11th to 20thDay
36%6%14%25%17%1
2520
21st to endDay
36%7%15%25%16%2
2520
July1st to 10thDay
31%6%14%32%14%3
2451
11th to 20thDay
32%6%15%28%16%2
2445
21st to endDay
30%6%17%27%16%3
2591
August1st to 10thDay
34%7%17%28%12%2
2492
11th to 20thDay
37%6%15%28%14%1
2181
21st to endDay
37%6%12%26%17%2
2376
September1st to 10thDay
39%7%10%26%16%2
2160
11th to 20thDay
36%412%31%16%1
2053
21st to endDay
41%412%30%12%
1980
October1st to 10thDay
41%5%9%29%15%1
1913
11th to 20thDay
52%412%20%10%1
1769
21st to endDay
49%5%13%21%11%1
1782
November1st to 10thDay
42%413%26%14%2
1672
11th to 20thDay
50%5%14%22%9%1
1710
21st to endDay
48%5%13%25%8%
1573
December1st to 10thDay
53%416%19%7%1
1520
11th to 20thDay
52%5%15%19%7%2
1915
21st to endDay
70%39%12%5%
2783
January1st to 10thNight
52%410%20%12%1
2648
11th to 20thNight
58%413%17%8%
2575
21st to endNight
54%5%13%18%10%1
2768
February1st to 10thNight
52%410%20%12%2
2340
11th to 20thNight
46%5%11%22%15%2
2103
21st to endNight
51%312%19%13%3
1776
March1st to 10thNight
48%5%14%21%10%2
2160
11th to 20thNight
39%5%14%23%16%3
2120
21st to endNight
51%411%23%9%2
1980
April1st to 10thNight
48%5%9%20%17%1
1800
11th to 20thNight
48%47%20%17%4
1775
21st to endNight
45%5%12%22%14%2
1674
May1st to 10thNight
47%5%12%23%11%1
1610
11th to 20thNight
44%5%13%22%14%2
1417
21st to endNight
38%7%13%24%14%3
1552
June1st to 10thNight
32%6%15%28%18%2
1440
11th to 20thNight
36%5%10%26%21%2
1440
21st to endNight
35%417%24%18%2
1440
July1st to 10thNight
27%5%15%32%18%4
1400
11th to 20thNight
27%6%14%30%19%4
1392
21st to endNight
26%6%17%27%19%5%
1487
August1st to 10thNight
29%5%17%30%16%3
1423
11th to 20thNight
28%5%18%31%16%1
1716
21st to endNight
31%411%30%20%3
1980
September1st to 10thNight
31%6%11%27%23%2
1800
11th to 20thNight
32%49%37%17%2
1887
21st to endNight
39%310%32%15%1
1980
October1st to 10thNight
38%410%29%17%2
2045
11th to 20thNight
44%413%22%16%1
2190
21st to endNight
49%5%12%23%11%1
2574
November1st to 10thNight
38%411%27%17%3
2406
11th to 20thNight
47%5%13%21%11%2
2470
21st to endNight
47%5%15%23%9%1
2605
December1st to 10thNight
52%413%21%8%1
2660
11th to 20thNight
55%5%12%17%9%1
3281
21st to endNight
66%410%14%6%
4884

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
16%17%38%23%5%1
270
11th to 20thDay
17%17%34%25%6%1
249
21st to endDay
23%13%38%20%5%1
264
February1st to 10thDay
13%20%47%14%5%
240
11th to 20thDay
19%26%36%14%5%
240
21st to endDay
22%24%42%12%1
198
March1st to 10thDay
16%23%44%14%3
240
11th to 20thDay
22%18%31%20%7%2
259
21st to endDay
26%14%29%22%7%2
462
April1st to 10thDay
25%12%36%21%5%
420
11th to 20thDay
20%20%27%22%9%3
412
21st to endDay
21%12%29%25%12%1
420
May1st to 10thDay
23%11%33%23%7%2
431
11th to 20thDay
20%10%33%25%9%3
625
21st to endDay
15%7%30%28%13%6%
679
June1st to 10thDay
9%7%32%34%14%4
630
11th to 20thDay
14%8%27%32%13%5%
630
21st to endDay
10%7%32%32%16%4
630
July1st to 10thDay
9%219%35%25%10%
621
11th to 20thDay
9%5%26%35%19%7%
618
21st to endDay
7%328%37%20%6%
684
August1st to 10thDay
7%323%39%18%10%
626
11th to 20thDay
11%415%30%26%13%
439
21st to endDay
11%6%20%33%20%9%
495
September1st to 10thDay
12%8%23%28%20%8%
450
11th to 20thDay
10%5%22%30%23%10%
450
21st to endDay
16%12%23%25%17%6%
450
October1st to 10thDay
21%9%24%27%14%5%
383
11th to 20thDay
22%19%32%17%9%
270
21st to endDay
25%15%38%17%41
297
November1st to 10thDay
16%18%33%22%9%1
270
11th to 20thDay
14%21%37%19%8%
270
21st to endDay
23%11%40%21%4
270
December1st to 10thDay
21%20%38%15%6%1
270
11th to 20thDay
21%18%37%16%6%1
270
21st to endDay
25%19%37%16%31
297
January1st to 10thNight
19%17%36%23%5%
950
11th to 20thNight
22%14%37%20%7%1
920
21st to endNight
18%13%38%24%6%
990
February1st to 10thNight
20%14%37%24%4
900
11th to 20thNight
19%16%36%24%5%
707
21st to endNight
24%17%36%18%5%
592
March1st to 10thNight
20%12%35%24%8%1
720
11th to 20thNight
15%12%37%26%8%
700
21st to endNight
22%6%29%32%9%2
594
April1st to 10thNight
21%12%33%26%7%
540
11th to 20thNight
25%9%32%26%7%2
533
21st to endNight
22%6%29%30%12%1
540
May1st to 10thNight
18%8%31%36%7%1
540
11th to 20thNight
20%5%29%31%14%1
531
21st to endNight
12%424%36%21%2
584
June1st to 10thNight
12%225%41%19%1
540
11th to 20thNight
14%329%36%16%2
540
21st to endNight
11%224%43%19%1
540
July1st to 10thNight
8%214%41%30%5%
525
11th to 20thNight
7%220%44%24%4
522
21st to endNight
7%220%43%26%1
591
August1st to 10thNight
7%216%44%28%3
537
11th to 20thNight
10%315%37%29%6%
534
21st to endNight
10%219%39%27%4
594
September1st to 10thNight
10%420%36%25%5%
540
11th to 20thNight
12%421%31%26%6%
627
21st to endNight
15%8%23%27%22%5%
720
October1st to 10thNight
17%7%27%31%17%2
720
11th to 20thNight
21%12%33%26%8%1
720
21st to endNight
23%11%32%25%8%1
792
November1st to 10thNight
16%10%38%24%10%1
740
11th to 20thNight
19%17%36%21%7%
760
21st to endNight
21%13%38%22%7%
895
December1st to 10thNight
23%16%36%20%5%
950
11th to 20thNight
22%13%37%21%5%1
950
21st to endNight
28%15%35%19%3
1045
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