Jackson (WI)
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Jackson (WI) clear sky chart from 2005-11-05 to 2019-06-24.

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
36%
18481
17%
53982
10%
18438
43%
18438
24%
35700

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
20%
1050
15%
2926
4%
1045
30%
1045
17%
2122
January16th to endNight
19%
1120
14%
3133
3%
1120
28%
1120
19%
2247
February1st to 15thNight
21%
965
15%
2615
3%
964
30%
964
18%
1838
February16th to endNight
22%
735
17%
2205
5%
735
32%
735
17%
1530
March1st to 15thNight
28%
840
17%
2520
9%
840
36%
840
21%
1677
March16th to endNight
38%
726
18%
2347
14%
726
45%
726
23%
1537
April1st to 15thNight
28%
629
16%
2097
10%
629
38%
629
18%
1442
April16th to endNight
38%
624
19%
1980
12%
624
47%
624
23%
1308
May1st to 15thNight
38%
630
16%
1812
10%
630
44%
630
23%
1259
May16th to endNight
49%
658
16%
1754
9%
657
54%
657
31%
1132
June1st to 15thNight
52%
630
15%
1680
10%
630
56%
630
34%
1068
June16th to endNight
51%
609
14%
1624
8%
609
54%
609
33%
1048
July1st to 15thNight
69%
555
19%
1480
13%
555
71%
555
46%
827
July16th to endNight
65%
612
18%
1545
12%
579
68%
579
45%
880
August1st to 15thNight
70%
575
23%
1609
19%
572
73%
572
43%
901
August16th to endNight
61%
621
20%
2070
20%
621
65%
621
32%
1191
September1st to 15thNight
62%
585
28%
1950
28%
585
68%
585
37%
1042
September16th to endNight
53%
776
26%
2144
18%
776
59%
776
36%
1281
October1st to 15thNight
40%
780
21%
2258
14%
780
46%
780
27%
1462
October16th to endNight
31%
832
18%
2662
9%
832
41%
832
22%
1711
November1st to 15thNight
32%
820
22%
2666
15%
820
41%
820
23%
1685
November16th to endNight
23%
939
16%
2829
6%
939
33%
939
18%
1965
December1st to 15thNight
20%
1050
13%
2940
4%
1050
28%
1050
17%
2131
December16th to endNight
15%
1120
12%
3136
2%
1120
24%
1120
13%
2416

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%36%5%3445%7%36%
54847
Night
13%8%35%43445%6%39%
54150
Cloud CoverDay
13%7%36%5%345%5%7%36%
54856
Night
13%7%35%42445%7%40%
54155
TransparencyDay
45%5%12%23%11%1
54533
Night
43%412%23%13%1
53982
SeeingDay
16%8%28%27%13%5%
8399
Night
18%8%30%28%13%1
18484

By Month

Percentage Cloud Cover NE (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
13%12%5%6%5%345%5%7%30%
1672
16th to endDay
10%13%7%10%6%36%447%24%
1792
February1st to 15thDay
13%12%6%7%5%245%46%32%
1906
16th to endDay
13%12%47%5%35%446%30%
1840
March1st to 15thDay
13%10%5%6%5%35%5%47%33%
2090
16th to endDay
15%8%36%5%35%45%7%33%
2591
April1st to 15thDay
18%11%46%6%2445%5%29%
2511
16th to endDay
17%9%35%42445%6%35%
2585
May1st to 15thDay
18%8%36%5%45%45%7%31%
2797
16th to endDay
12%6%26%5%345%6%8%39%
3065
June1st to 15thDay
10%5%35%5%35%5%6%8%39%
2940
16th to endDay
9%426%5%36%5%6%9%40%
2843
July1st to 15thDay
6%325%435%5%6%9%46%
2730
16th to endDay
7%5%25%5%35%5%6%9%42%
2879
August1st to 15thDay
8%425%5%46%6%6%8%41%
2592
16th to endDay
12%5%26%5%346%5%7%40%
2484
September1st to 15thDay
11%425%5%2445%7%45%
2327
16th to endDay
9%5%26%5%4445%8%43%
2145
October1st to 15thDay
18%8%25%424448%37%
2031
16th to endDay
17%9%25%5%345%5%7%34%
1914
November1st to 15thDay
11%10%37%5%24447%37%
1852
16th to endDay
13%10%35%6%44347%34%
1789
December1st to 15thDay
14%10%37%6%35%45%7%30%
1680
16th to endDay
18%13%7%8%6%2445%6%21%
1792
January1st to 15thNight
14%11%47%43444435%
2926
16th to endNight
12%9%48%5%36%45%8%30%
3133
February1st to 15thNight
13%12%46%43335%5%36%
2613
16th to endNight
16%9%47%5%245%5%434%
2205
March1st to 15thNight
13%9%344345%5%6%37%
2507
16th to endNight
14%7%35%5%345%5%6%38%
2347
April1st to 15thNight
19%9%35%5%23446%34%
2097
16th to endNight
17%8%3442445%5%39%
1980
May1st to 15thNight
17%7%27%4345%5%7%34%
1812
16th to endNight
9%5%25%4345%6%10%41%
1752
June1st to 15thNight
12%425%3345%6%8%45%
1680
16th to endNight
9%425%43445%8%44%
1624
July1st to 15thNight
421432446%8%56%
1560
16th to endNight
5%313425%5%6%8%54%
1641
August1st to 15thNight
422432446%8%54%
1618
16th to endNight
10%3245%2445%7%49%
2070
September1st to 15thNight
9%314323346%57%
1950
16th to endNight
10%425%423347%50%
2144
October1st to 15thNight
15%7%35%423345%44%
2258
16th to endNight
16%8%2443345%7%39%
2662
November1st to 15thNight
13%7%25%5%3435%6%42%
2666
16th to endNight
15%8%36%5%35%446%34%
2829
December1st to 15thNight
16%10%46%6%34445%32%
2940
16th to endNight
17%14%47%5%25%5%47%25%
3136

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
13%11%5%7%435%45%6%31%
1672
16th to endDay
10%14%6%9%6%35%447%26%
1792
February1st to 15thDay
13%12%6%7%4235%46%32%
1906
16th to endDay
13%13%37%5%35%5%5%6%30%
1840
March1st to 15thDay
13%10%46%5%3445%7%33%
2100
16th to endDay
15%8%37%5%35%45%6%34%
2590
April1st to 15thDay
19%10%46%6%34445%29%
2511
16th to endDay
17%8%35%5%23447%35%
2585
May1st to 15thDay
18%8%35%6%35%5%5%6%31%
2797
16th to endDay
12%5%25%5%35%5%6%8%39%
3065
June1st to 15thDay
11%5%35%6%345%6%8%40%
2940
16th to endDay
8%5%26%5%25%6%6%9%40%
2843
July1st to 15thDay
6%3145%35%5%6%9%47%
2730
16th to endDay
7%425%5%35%5%6%8%43%
2879
August1st to 15thDay
7%416%5%45%6%7%9%41%
2592
16th to endDay
12%5%25%5%345%5%8%41%
2484
September1st to 15thDay
11%4245%245%5%7%46%
2327
16th to endDay
9%5%25%5%25%45%9%43%
2145
October1st to 15thDay
17%8%25%423447%37%
2031
16th to endDay
17%7%35%5%345%5%7%34%
1914
November1st to 15thDay
11%9%47%5%3435%7%37%
1852
16th to endDay
14%10%346%44447%35%
1789
December1st to 15thDay
14%10%37%6%4345%7%32%
1680
16th to endDay
19%13%6%7%5%3446%5%23%
1792
January1st to 15thNight
14%11%5%7%5%3434335%
2926
16th to endNight
12%9%5%8%5%35%46%8%30%
3133
February1st to 15thNight
14%12%36%413445%37%
2606
16th to endNight
16%10%36%5%25%445%34%
2205
March1st to 15thNight
14%9%35%4345%5%7%37%
2520
16th to endNight
14%7%36%4345%5%6%38%
2347
April1st to 15thNight
19%8%25%5%3435%6%34%
2097
16th to endNight
17%8%34324445%39%
1980
May1st to 15thNight
18%7%36%5%245%6%7%34%
1811
16th to endNight
10%5%25%5%335%6%11%41%
1752
June1st to 15thNight
12%423335%46%8%44%
1680
16th to endNight
10%425%5%34448%44%
1624
July1st to 15thNight
5%21332346%8%56%
1560
16th to endNight
5%3133246%6%8%53%
1641
August1st to 15thNight
4313335%46%8%54%
1618
16th to endNight
10%315%42445%7%49%
2070
September1st to 15thNight
9%323323336%57%
1950
16th to endNight
10%425%423447%50%
2144
October1st to 15thNight
16%7%25%423336%44%
2258
16th to endNight
16%7%3442435%7%39%
2662
November1st to 15thNight
13%7%25%5%2445%6%42%
2666
16th to endNight
15%8%36%5%35%45%7%34%
2829
December1st to 15thNight
16%11%46%5%3435%6%33%
2940
16th to endNight
18%13%5%7%5%24447%26%
3136

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
51%5%12%20%8%
1673
16th to endDay
58%5%11%17%7%
1792
February1st to 15thDay
52%411%22%8%
1908
16th to endDay
53%5%10%19%9%1
1840
March1st to 15thDay
50%5%12%20%9%1
2100
16th to endDay
49%5%14%22%7%
2591
April1st to 15thDay
56%410%18%9%
2511
16th to endDay
47%5%10%19%13%3
2585
May1st to 15thDay
51%5%12%22%7%
2797
16th to endDay
40%6%13%25%13%1
3069
June1st to 15thDay
39%5%13%26%12%1
2940
16th to endDay
37%7%16%22%15%1
2843
July1st to 15thDay
30%6%13%30%14%3
2581
16th to endDay
34%7%16%24%14%3
2712
August1st to 15thDay
36%6%14%28%12%1
2577
16th to endDay
40%6%10%26%14%1
2484
September1st to 15thDay
35%5%9%27%19%1
2327
16th to endDay
38%413%29%12%
2145
October1st to 15thDay
45%5%10%23%13%1
2031
16th to endDay
48%5%14%21%9%
1914
November1st to 15thDay
45%412%24%11%1
1852
16th to endDay
48%5%16%23%5%
1789
December1st to 15thDay
52%415%20%7%
1680
16th to endDay
61%5%11%14%7%
1792
January1st to 15thNight
52%49%20%12%
2926
16th to endNight
51%415%19%8%
3133
February1st to 15thNight
49%411%21%11%1
2615
16th to endNight
50%411%22%9%1
2205
March1st to 15thNight
45%5%13%21%12%2
2520
16th to endNight
44%413%25%9%1
2347
April1st to 15thNight
50%37%20%16%1
2097
16th to endNight
45%410%20%15%3
1980
May1st to 15thNight
47%412%23%11%
1812
16th to endNight
35%7%14%24%14%3
1754
June1st to 15thNight
35%5%12%28%16%1
1680
16th to endNight
37%5%14%23%18%1
1624
July1st to 15thNight
24%5%13%31%20%4
1480
16th to endNight
24%6%18%27%18%4
1545
August1st to 15thNight
25%5%16%32%17%1
1609
16th to endNight
33%5%12%29%16%2
2070
September1st to 15thNight
28%410%28%25%2
1950
16th to endNight
33%410%36%13%1
2144
October1st to 15thNight
42%410%24%16%1
2258
16th to endNight
43%414%24%11%
2662
November1st to 15thNight
42%411%24%14%2
2666
16th to endNight
49%415%21%7%
2829
December1st to 15thNight
52%413%20%8%
2940
16th to endNight
59%5%10%15%7%
3136

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
18%13%34%28%5%
180
16th to endDay
18%13%38%21%6%1
192
February1st to 15thDay
15%22%45%12%3
180
16th to endDay
24%21%33%17%11
159
March1st to 15thDay
19%17%39%16%5%2
180
16th to endDay
22%9%30%25%10%1
361
April1st to 15thDay
28%11%31%20%7%
390
16th to endDay
20%10%26%26%13%2
379
May1st to 15thDay
26%9%28%24%7%2
484
16th to endDay
15%7%32%27%11%5%
677
June1st to 15thDay
11%6%29%34%13%4
645
16th to endDay
11%6%29%32%14%4
611
July1st to 15thDay
8%221%36%20%10%
550
16th to endDay
9%226%33%22%6%
595
August1st to 15thDay
8%319%35%21%11%
486
16th to endDay
13%5%17%28%24%10%
396
September1st to 15thDay
9%321%27%22%14%
375
16th to endDay
12%6%19%30%23%7%
374
October1st to 15thDay
28%7%22%25%12%3
261
16th to endDay
19%14%41%18%6%
192
November1st to 15thDay
16%15%29%25%11%1
180
16th to endDay
22%11%40%20%5%
180
December1st to 15thDay
16%17%37%17%9%1
180
16th to endDay
29%18%35%11%3
192
January1st to 15thNight
21%15%36%20%6%
1050
16th to endNight
17%13%40%22%4
1120
February1st to 15thNight
21%14%34%24%4
967
16th to endNight
22%14%33%23%6%
735
March1st to 15thNight
19%11%34%25%8%
840
16th to endNight
17%5%31%31%11%1
726
April1st to 15thNight
24%9%32%26%6%
629
16th to endNight
23%430%28%11%1
624
May1st to 15thNight
21%5%28%32%10%1
630
16th to endNight
11%326%37%18%2
659
June1st to 15thNight
15%223%38%19%1
630
16th to endNight
12%126%39%18%1
609
July1st to 15thNight
6%116%41%29%4
555
16th to endNight
6%120%41%28%2
612
August1st to 15thNight
6%114%44%29%3
575
16th to endNight
12%116%35%28%5%
621
September1st to 15thNight
10%318%31%27%8%
585
16th to endNight
12%5%20%29%26%5%
776
October1st to 15thNight
20%7%25%30%13%1
780
16th to endNight
20%10%33%25%9%
832
November1st to 15thNight
19%9%35%23%11%1
820
16th to endNight
20%13%36%23%7%
939
December1st to 15thNight
23%14%34%22%4
1050
16th to endNight
26%12%37%18%4
1120
Page generated at 2019-06-24 19:41:30. Version ac04

Copyright 2019 A. Danko


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