Kettle Moraine North
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Kettle Moraine North clear sky chart from 2005-11-06 to 2024-01-10.

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
34%
24711
17%
74619
9%
24656
41%
24656
22%
50335

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
20%
950
14%
2647
4%
946
28%
946
17%
1930
January11th to 20thNight
19%
900
12%
2520
3%
900
27%
900
14%
1919
January21st to endNight
21%
990
12%
2772
4%
990
29%
990
16%
2074
February1st to 10thNight
19%
900
13%
2344
2%
900
27%
900
18%
1721
February11th to 20thNight
22%
713
19%
2111
6%
712
33%
712
18%
1445
February21st to endNight
18%
592
17%
1776
4%
592
30%
592
17%
1239
March1st to 10thNight
27%
720
15%
2160
8%
720
34%
720
19%
1473
March11th to 20thNight
28%
699
20%
2120
10%
699
38%
699
24%
1350
March21st to endNight
34%
594
19%
1980
15%
594
42%
594
17%
1384
April1st to 10thNight
24%
540
14%
1800
6%
540
35%
540
18%
1215
April11th to 20thNight
30%
533
19%
1775
13%
533
40%
533
19%
1186
April21st to endNight
34%
540
17%
1669
9%
540
42%
540
22%
1113
May1st to 10thNight
32%
540
15%
1597
9%
540
38%
540
21%
1123
May11th to 20thNight
35%
531
19%
1416
10%
531
43%
531
24%
989
May21st to endNight
48%
583
14%
1552
8%
582
53%
582
29%
1033
June1st to 10thNight
51%
540
16%
1440
9%
540
56%
540
35%
892
June11th to 20thNight
46%
540
17%
1440
10%
540
51%
540
33%
920
June21st to endNight
53%
540
17%
1440
9%
540
57%
540
36%
897
July1st to 10thNight
65%
525
17%
1400
11%
525
68%
525
42%
832
July11th to 20thNight
59%
522
20%
1392
13%
522
63%
522
41%
824
July21st to endNight
62%
591
22%
1487
14%
558
66%
558
43%
874
August1st to 10thNight
66%
537
22%
1423
18%
534
68%
534
40%
850
August11th to 20thNight
65%
534
21%
1699
20%
534
70%
534
34%
968
August21st to endNight
60%
594
22%
1980
21%
594
66%
594
33%
1103
September1st to 10thNight
56%
540
23%
1800
20%
540
62%
540
31%
1026
September11th to 20thNight
56%
625
29%
1885
24%
625
62%
625
36%
1085
September21st to endNight
44%
720
22%
1980
15%
720
50%
720
30%
1265
October1st to 10thNight
43%
720
21%
2049
14%
720
49%
720
29%
1299
October11th to 20thNight
30%
720
18%
2195
8%
720
41%
720
21%
1473
October21st to endNight
29%
792
14%
2574
9%
792
37%
792
19%
1751
November1st to 10thNight
31%
740
24%
2406
14%
740
44%
740
24%
1475
November11th to 20thNight
22%
760
17%
2470
8%
760
32%
760
16%
1704
November21st to endNight
21%
909
16%
2619
6%
909
31%
909
19%
1830
December1st to 10thNight
20%
950
12%
2660
3%
950
27%
950
17%
1936
December11th to 20thNight
17%
950
12%
3213
1%
948
25%
948
12%
2392
December21st to endNight
14%
1037
7%
4828
2%
1026
22%
1026
7%
3745

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%
74774
Night
13%9%36%5%35%5%5%7%39%
74925
TransparencyDay
45%7%13%22%12%1
74475
Night
45%6%12%22%13%2
74745
SeeingDay
16%12%31%25%13%4
14732
Night
17%10%32%28%11%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
11%11%5%9%6%35%5%6%7%32%
1509
11th to 20thDay
13%15%6%11%8%45%45%6%23%
1440
21st to endDay
11%15%8%10%6%45%5%47%26%
1584
February1st to 10thDay
12%12%7%9%5%246%5%6%32%
1612
11th to 20thDay
13%11%47%6%345%47%36%
1734
21st to endDay
12%14%5%8%6%45%5%5%6%31%
1480
March1st to 10thDay
14%10%5%7%5%35%5%5%6%35%
1800
11th to 20thDay
11%11%5%6%6%45%45%6%37%
1854
21st to endDay
18%10%47%7%35%5%5%5%31%
2376
April1st to 10thDay
17%12%5%7%5%35%45%7%30%
2160
11th to 20thDay
18%10%37%5%3445%7%33%
2134
21st to endDay
19%9%37%5%345%5%6%32%
2290
May1st to 10thDay
16%8%36%6%45%6%6%8%34%
2361
11th to 20thDay
16%6%36%7%45%45%7%38%
2479
21st to endDay
13%6%36%5%345%7%9%40%
2725
June1st to 10thDay
10%5%35%5%345%6%9%44%
2520
11th to 20thDay
11%5%26%5%35%5%6%9%42%
2520
21st to endDay
9%5%25%6%36%5%6%10%44%
2520
July1st to 10thDay
7%424435%5%7%11%47%
2520
11th to 20thDay
8%4245%45%6%7%9%46%
2520
21st to endDay
7%4245%25%5%7%10%48%
2743
August1st to 10thDay
7%425%6%46%6%7%10%42%
2507
11th to 20thDay
12%5%246%45%5%6%8%43%
2199
21st to endDay
11%5%35%5%345%5%8%45%
2376
September1st to 10thDay
12%6%36%5%445%6%8%42%
2160
11th to 20thDay
12%5%245%3446%7%47%
2056
21st to endDay
13%7%25%6%446%5%7%41%
1980
October1st to 10thDay
15%6%36%5%345%5%7%42%
1908
11th to 20thDay
22%8%36%6%445%6%7%29%
1764
21st to endDay
17%10%38%5%3445%6%34%
1782
November1st to 10thDay
11%8%46%5%25%46%7%42%
1672
11th to 20thDay
11%10%5%9%7%46%46%8%31%
1710
21st to endDay
17%9%46%6%34346%36%
1558
December1st to 10thDay
14%11%5%8%6%37%5%5%8%28%
1520
11th to 20thDay
11%14%5%7%7%36%6%6%8%28%
1918
21st to endDay
18%19%9%11%7%24345%18%
2783
January1st to 10thNight
13%11%5%8%6%4445%5%35%
2647
11th to 20thNight
16%11%6%9%6%36%5%5%5%29%
2520
21st to endNight
12%11%5%9%7%45%5%6%7%28%
2772
February1st to 10thNight
13%12%5%8%6%43446%35%
2344
11th to 20thNight
11%8%47%7%36%5%5%5%38%
2111
21st to endNight
17%12%46%435%45%5%35%
1776
March1st to 10thNight
15%9%46%5%25%5%5%7%37%
2160
11th to 20thNight
13%7%35%6%345%5%8%42%
2120
21st to endNight
17%8%38%5%35%5%5%6%34%
1980
April1st to 10thNight
17%11%46%5%345%5%7%35%
1800
11th to 20thNight
20%8%36%5%3445%6%38%
1775
21st to endNight
17%8%36%5%4445%6%39%
1669
May1st to 10thNight
14%8%47%6%36%5%5%8%34%
1597
11th to 20thNight
16%7%37%5%346%6%8%37%
1416
21st to endNight
12%6%345%36%5%6%9%42%
1551
June1st to 10thNight
11%425%435%5%6%9%48%
1440
11th to 20thNight
12%425%5%345%6%8%46%
1440
21st to endNight
9%426%43446%7%51%
1440
July1st to 10thNight
6%3344236%6%9%54%
1440
11th to 20thNight
6%325%4246%7%9%52%
1440
21st to endNight
6%324435%5%6%8%54%
1575
August1st to 10thNight
6%3245%345%7%10%50%
1432
11th to 20thNight
7%4245%35%5%5%8%51%
1699
21st to endNight
9%424435%5%5%7%51%
1980
September1st to 10thNight
10%5%25%42445%7%53%
1800
11th to 20thNight
12%42432445%7%54%
1885
21st to endNight
13%7%245%24447%48%
1980
October1st to 10thNight
12%6%26%5%3345%6%47%
2049
11th to 20thNight
16%7%26%5%45%45%7%39%
2195
21st to endNight
17%10%36%5%345%6%7%34%
2574
November1st to 10thNight
12%6%35%5%3445%6%46%
2406
11th to 20thNight
14%8%48%6%45%5%5%7%33%
2470
21st to endNight
16%9%35%6%35%5%5%6%36%
2619
December1st to 10thNight
14%12%5%7%7%35%5%6%7%31%
2660
11th to 20thNight
13%13%5%8%7%45%5%5%6%29%
3279
21st to endNight
20%18%5%8%7%34446%21%
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
52%6%14%19%9%1
1510
11th to 20thDay
63%410%15%8%1
1440
21st to endDay
59%5%12%15%8%1
1584
February1st to 10thDay
52%6%13%20%8%1
1612
11th to 20thDay
50%6%10%21%12%2
1744
21st to endDay
54%5%11%17%10%3
1480
March1st to 10thDay
48%8%13%20%9%2
1800
11th to 20thDay
46%5%12%20%14%2
1854
21st to endDay
54%7%12%19%7%1
2376
April1st to 10thDay
54%7%11%18%10%
2160
11th to 20thDay
51%6%8%20%12%3
2134
21st to endDay
51%7%11%18%11%2
2290
May1st to 10thDay
47%7%13%21%10%1
2361
11th to 20thDay
46%7%11%23%12%2
2483
21st to endDay
41%8%12%23%14%2
2725
June1st to 10thDay
36%7%12%28%14%2
2520
11th to 20thDay
38%7%13%24%16%1
2520
21st to endDay
36%9%14%25%15%1
2520
July1st to 10thDay
30%8%14%31%14%3
2451
11th to 20thDay
32%9%15%26%16%3
2445
21st to endDay
29%8%16%26%16%4
2591
August1st to 10thDay
33%10%16%27%12%2
2492
11th to 20thDay
38%8%14%27%13%1
2199
21st to endDay
37%7%12%25%17%2
2376
September1st to 10thDay
39%8%11%26%14%1
2160
11th to 20thDay
35%7%13%31%13%1
2056
21st to endDay
41%5%14%28%11%
1980
October1st to 10thDay
41%7%10%27%15%1
1908
11th to 20thDay
53%7%12%18%10%1
1764
21st to endDay
51%6%13%18%11%
1782
November1st to 10thDay
41%5%14%24%14%2
1672
11th to 20thDay
51%5%14%20%8%1
1710
21st to endDay
50%415%23%7%1
1558
December1st to 10thDay
53%7%16%16%7%1
1520
11th to 20thDay
54%417%15%8%2
1915
21st to endDay
70%410%11%5%
2783
January1st to 10thNight
52%6%10%18%12%1
2647
11th to 20thNight
57%6%12%16%8%1
2520
21st to endNight
55%6%12%16%10%1
2772
February1st to 10thNight
52%410%20%12%2
2344
11th to 20thNight
47%5%11%21%14%2
2112
21st to endNight
50%5%12%19%12%2
1776
March1st to 10thNight
47%6%13%21%11%2
2160
11th to 20thNight
39%7%14%22%16%2
2120
21st to endNight
51%6%9%22%11%2
1980
April1st to 10thNight
48%5%10%18%17%1
1800
11th to 20thNight
48%5%9%19%17%3
1775
21st to endNight
45%5%13%21%14%1
1669
May1st to 10thNight
48%7%12%22%11%1
1597
11th to 20thNight
45%7%11%22%13%2
1417
21st to endNight
38%8%13%24%15%2
1552
June1st to 10thNight
32%7%13%29%18%1
1440
11th to 20thNight
35%7%11%26%19%2
1440
21st to endNight
33%7%16%25%18%2
1440
July1st to 10thNight
27%8%14%29%20%4
1400
11th to 20thNight
26%9%13%29%19%4
1392
21st to endNight
26%7%15%29%18%5%
1487
August1st to 10thNight
27%9%16%29%16%3
1423
11th to 20thNight
29%8%15%30%17%1
1699
21st to endNight
31%6%12%29%20%3
1980
September1st to 10thNight
32%7%10%25%24%2
1800
11th to 20thNight
31%5%11%35%16%1
1885
21st to endNight
36%7%10%31%15%1
1980
October1st to 10thNight
38%6%9%29%17%1
2049
11th to 20thNight
45%6%14%20%14%1
2195
21st to endNight
48%5%14%21%11%
2574
November1st to 10thNight
39%5%11%26%17%2
2406
11th to 20thNight
50%5%14%19%11%1
2470
21st to endNight
49%5%15%22%8%1
2619
December1st to 10thNight
52%6%14%19%8%1
2660
11th to 20thNight
55%6%12%16%9%1
3281
21st to endNight
65%5%11%14%5%
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
17%17%35%23%7%1
267
11th to 20thDay
16%19%34%24%7%
240
21st to endDay
20%13%42%20%5%1
264
February1st to 10thDay
15%22%42%16%5%
240
11th to 20thDay
21%26%33%16%4
240
21st to endDay
23%25%39%12%11
198
March1st to 10thDay
19%26%42%10%3
240
11th to 20thDay
23%17%33%19%6%2
258
21st to endDay
27%12%32%22%6%1
462
April1st to 10thDay
26%12%35%20%6%
420
11th to 20thDay
22%21%28%17%11%2
412
21st to endDay
23%13%28%23%12%1
420
May1st to 10thDay
21%13%34%23%8%2
444
11th to 20thDay
17%12%33%24%11%3
625
21st to endDay
16%11%28%26%14%6%
679
June1st to 10thDay
10%8%33%32%12%5%
630
11th to 20thDay
13%9%30%29%14%4
630
21st to endDay
12%7%32%32%12%5%
630
July1st to 10thDay
8%5%22%31%26%9%
621
11th to 20thDay
9%7%29%30%20%6%
618
21st to endDay
5%432%32%20%6%
684
August1st to 10thDay
8%325%35%19%9%
626
11th to 20thDay
14%415%30%24%13%
447
21st to endDay
13%7%23%28%21%9%
495
September1st to 10thDay
13%7%25%28%18%8%
450
11th to 20thDay
12%5%20%34%21%9%
450
21st to endDay
18%13%26%22%17%5%
450
October1st to 10thDay
19%11%25%26%15%4
378
11th to 20thDay
21%21%33%17%7%
270
21st to endDay
26%14%39%15%5%1
297
November1st to 10thDay
17%18%34%21%9%2
270
11th to 20thDay
16%20%40%18%6%
270
21st to endDay
23%16%39%17%6%
270
December1st to 10thDay
20%18%41%15%41
270
11th to 20thDay
22%20%37%13%6%1
270
21st to endDay
25%20%35%18%11
297
January1st to 10thNight
17%17%38%22%6%
950
11th to 20thNight
21%14%38%21%6%1
900
21st to endNight
18%13%38%25%6%
990
February1st to 10thNight
20%16%36%24%41
900
11th to 20thNight
16%17%37%24%5%
716
21st to endNight
25%15%36%20%41
592
March1st to 10thNight
20%13%35%24%8%1
720
11th to 20thNight
15%14%38%25%7%
699
21st to endNight
21%8%29%32%8%1
594
April1st to 10thNight
21%11%38%23%7%
540
11th to 20thNight
23%10%34%25%7%1
533
21st to endNight
21%9%31%29%10%1
540
May1st to 10thNight
19%9%34%32%6%1
540
11th to 20thNight
18%8%30%31%12%1
531
21st to endNight
15%5%25%35%18%2
584
June1st to 10thNight
11%5%27%39%17%1
540
11th to 20thNight
14%5%30%36%14%2
540
21st to endNight
10%5%24%43%17%1
540
July1st to 10thNight
8%119%41%28%3
525
11th to 20thNight
7%225%39%25%2
522
21st to endNight
6%324%41%25%1
591
August1st to 10thNight
7%216%45%26%4
537
11th to 20thNight
8%216%40%27%6%
534
21st to endNight
10%220%40%24%3
594
September1st to 10thNight
11%423%34%24%6%
540
11th to 20thNight
12%422%32%23%6%
625
21st to endNight
15%9%25%27%20%3
720
October1st to 10thNight
15%8%28%30%18%2
720
11th to 20thNight
20%13%33%26%8%1
720
21st to endNight
22%11%33%25%9%1
792
November1st to 10thNight
15%12%38%24%10%1
740
11th to 20thNight
21%18%33%22%6%
760
21st to endNight
21%13%36%22%7%
909
December1st to 10thNight
20%16%37%22%5%
950
11th to 20thNight
22%14%39%19%5%1
950
21st to endNight
27%15%36%20%3
1045
Page generated at 2024-01-07 09:06:51. Version ac07

Copyright 2024 Attilla Danko


Kettle Moraine North Clear Sky Chart |Charts Home