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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 2005-11-05 to 2017-09-10.

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
35%
16025
16%
46765
9%
15983
42%
15983
23%
31394

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
19%
900
14%
2506
4%
895
28%
895
16%
1853
January16th to endNight
19%
960
13%
2688
3%
960
28%
960
16%
2004
February1st to 15thNight
22%
830
15%
2244
3%
830
30%
830
19%
1583
February16th to endNight
24%
631
16%
1893
6%
631
33%
631
15%
1344
March1st to 15thNight
28%
720
16%
2160
8%
720
35%
720
20%
1452
March16th to endNight
34%
621
17%
2011
13%
621
40%
621
19%
1370
April1st to 15thNight
26%
539
15%
1797
8%
539
37%
539
19%
1228
April16th to endNight
34%
540
18%
1712
11%
540
41%
540
21%
1152
May1st to 15thNight
32%
540
16%
1544
8%
540
39%
540
21%
1090
May16th to endNight
44%
562
16%
1498
8%
561
50%
561
30%
981
June1st to 15thNight
51%
540
14%
1440
7%
540
55%
540
33%
920
June16th to endNight
50%
540
15%
1440
8%
540
54%
540
34%
924
July1st to 15thNight
63%
510
17%
1360
11%
510
66%
510
43%
796
July16th to endNight
62%
564
18%
1417
11%
531
64%
531
41%
847
August1st to 15thNight
69%
539
23%
1499
19%
536
72%
536
42%
841
August16th to endNight
59%
573
20%
1910
20%
573
63%
573
30%
1101
September1st to 15thNight
56%
525
26%
1750
23%
525
64%
525
34%
963
September16th to endNight
51%
654
23%
1812
15%
654
57%
654
33%
1122
October1st to 15thNight
42%
660
21%
1912
14%
660
49%
660
29%
1202
October16th to endNight
32%
704
15%
2255
8%
704
40%
704
20%
1504
November1st to 15thNight
32%
700
22%
2276
15%
700
41%
700
23%
1432
November16th to endNight
24%
813
14%
2433
7%
813
32%
813
17%
1729
December1st to 15thNight
18%
900
11%
2520
2%
900
25%
900
16%
1859
December16th to endNight
16%
960
12%
2688
1%
960
25%
960
13%
2097

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%35%45%7%36%
47870
Night
13%8%35%5%3445%7%39%
46933
Cloud CoverDay
13%8%36%5%3445%7%36%
47879
Night
13%7%35%5%2445%6%39%
46938
TransparencyDay
46%6%12%22%10%1
47556
Night
44%5%12%22%13%1
46765
SeeingDay
15%8%30%25%14%5%
6023
Night
17%9%31%28%12%1
16029

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%11%5%8%6%35%5%5%6%29%
1432
16th to endDay
11%13%7%10%7%45%447%24%
1536
February1st to 15thDay
13%13%5%8%425%446%32%
1615
16th to endDay
12%11%5%7%5%26%436%32%
1580
March1st to 15thDay
13%10%5%6%5%35%45%6%32%
1790
16th to endDay
17%10%45%5%2445%6%33%
2220
April1st to 15thDay
17%11%5%6%5%25%45%6%30%
2151
16th to endDay
19%8%36%5%23446%34%
2247
May1st to 15thDay
17%7%36%5%35%46%7%31%
2406
16th to endDay
12%425%6%3446%9%40%
2617
June1st to 15thDay
12%5%36%6%35%5%5%8%38%
2520
16th to endDay
8%426%6%25%5%6%9%41%
2520
July1st to 15thDay
6%424445%6%7%9%44%
2520
16th to endDay
7%425%5%35%5%7%9%42%
2655
August1st to 15thDay
7%5%25%6%45%6%6%9%40%
2450
16th to endDay
13%5%26%5%25%5%5%8%41%
2292
September1st to 15thDay
12%425%4345%5%8%43%
2089
16th to endDay
10%6%246%35%46%8%40%
1815
October1st to 15thDay
16%6%25%424447%40%
1716
16th to endDay
18%8%36%6%3445%6%32%
1617
November1st to 15thDay
11%8%47%5%3435%7%37%
1582
16th to endDay
15%9%47%7%33447%31%
1524
December1st to 15thDay
14%11%48%5%37%5%5%5%27%
1440
16th to endDay
19%15%5%9%6%25%346%20%
1536
January1st to 15thNight
16%10%47%5%45%34433%
2506
16th to endNight
11%10%5%9%6%45%5%6%6%29%
2688
February1st to 15thNight
13%11%5%6%5%24345%38%
2242
16th to endNight
14%10%45%6%35%446%33%
1893
March1st to 15thNight
14%9%3442445%7%38%
2147
16th to endNight
15%8%36%5%245%5%6%36%
2011
April1st to 15thNight
19%8%36%434346%34%
1797
16th to endNight
18%7%26%424445%38%
1712
May1st to 15thNight
17%6%36%5%345%47%34%
1544
16th to endNight
9%5%24435%5%6%9%42%
1496
June1st to 15thNight
11%424435%5%5%7%45%
1440
16th to endNight
8%5%25%425%45%8%47%
1440
July1st to 15thNight
6%2243335%6%9%53%
1440
16th to endNight
5%3144245%5%9%52%
1513
August1st to 15thNight
5%3224245%6%11%52%
1508
16th to endNight
9%5%2443445%7%48%
1910
September1st to 15thNight
9%41441335%6%54%
1750
16th to endNight
11%5%234135%48%49%
1812
October1st to 15thNight
12%6%25%424346%47%
1912
16th to endNight
15%8%35%4345%47%37%
2255
November1st to 15thNight
13%7%24435%446%43%
2276
16th to endNight
17%9%46%5%35%5%46%31%
2433
December1st to 15thNight
16%11%5%6%6%2445%5%30%
2520
16th to endNight
18%14%47%6%2445%6%24%
2688

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%9%5%35%35%6%29%
1432
16th to endDay
12%13%7%10%6%35%446%24%
1536
February1st to 15thDay
13%12%5%7%4246%36%32%
1615
16th to endDay
12%13%5%7%5%34446%32%
1580
March1st to 15thDay
14%9%5%7%435%45%6%33%
1800
16th to endDay
17%11%35%5%235%45%33%
2219
April1st to 15thDay
17%11%5%8%5%25%346%29%
2151
16th to endDay
20%9%26%5%23445%35%
2247
May1st to 15thDay
18%7%36%5%35%45%6%32%
2406
16th to endDay
12%425%5%345%6%8%40%
2617
June1st to 15thDay
12%5%36%6%345%5%8%38%
2520
16th to endDay
8%426%5%36%5%5%10%41%
2520
July1st to 15thDay
7%424436%5%7%10%44%
2520
16th to endDay
8%425%5%25%5%7%9%42%
2655
August1st to 15thDay
8%425%5%35%6%6%8%41%
2450
16th to endDay
13%5%25%43445%8%42%
2292
September1st to 15thDay
12%42443445%8%44%
2089
16th to endDay
10%6%246%445%6%8%39%
1815
October1st to 15thDay
17%6%25%433447%40%
1716
16th to endDay
19%8%37%6%3345%6%32%
1617
November1st to 15thDay
11%8%47%6%25%35%7%37%
1582
16th to endDay
15%9%37%7%34247%32%
1524
December1st to 15thDay
14%11%48%427%5%47%28%
1440
16th to endDay
19%14%6%9%5%25%346%21%
1536
January1st to 15thNight
16%10%47%5%35%43433%
2506
16th to endNight
11%9%5%8%5%46%5%5%7%29%
2688
February1st to 15thNight
13%11%5%6%423445%38%
2235
16th to endNight
14%10%46%5%35%445%34%
1893
March1st to 15thNight
15%8%35%42445%7%38%
2160
16th to endNight
15%8%36%5%345%46%36%
2011
April1st to 15thNight
19%9%35%424446%34%
1797
16th to endNight
18%7%35%42345%439%
1712
May1st to 15thNight
17%6%37%5%25%5%47%34%
1543
16th to endNight
10%5%24425%5%6%9%42%
1496
June1st to 15thNight
12%424425%5%5%7%44%
1440
16th to endNight
9%325%5%245%6%7%47%
1440
July1st to 15thNight
6%2243235%6%8%54%
1440
16th to endNight
5%3143245%5%9%53%
1513
August1st to 15thNight
5%3124235%6%10%53%
1508
16th to endNight
10%324425%447%48%
1910
September1st to 15thNight
9%324323346%54%
1750
16th to endNight
11%42442445%8%49%
1812
October1st to 15thNight
12%5%35%42335%6%47%
1912
16th to endNight
14%8%35%5%25%45%7%37%
2255
November1st to 15thNight
13%6%34434446%44%
2276
16th to endNight
17%8%46%6%3445%6%32%
2433
December1st to 15thNight
17%11%46%5%24446%30%
2520
16th to endNight
18%14%47%6%24446%25%
2688

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
54%5%13%19%7%
1433
16th to endDay
60%412%15%6%
1536
February1st to 15thDay
52%5%11%21%7%1
1617
16th to endDay
52%6%11%18%9%1
1580
March1st to 15thDay
49%7%12%18%9%1
1800
16th to endDay
50%7%13%20%6%1
2220
April1st to 15thDay
54%6%9%18%9%
2151
16th to endDay
50%5%10%19%10%2
2247
May1st to 15thDay
50%6%12%20%9%
2406
16th to endDay
40%7%12%24%14%1
2621
June1st to 15thDay
42%7%11%26%11%
2520
16th to endDay
36%8%15%22%15%1
2520
July1st to 15thDay
33%8%13%28%14%1
2371
16th to endDay
35%8%15%22%14%3
2488
August1st to 15thDay
37%7%13%27%11%1
2435
16th to endDay
39%6%11%26%14%1
2292
September1st to 15thDay
37%6%10%29%14%
2089
16th to endDay
40%6%14%26%11%
1815
October1st to 15thDay
43%6%11%24%13%
1716
16th to endDay
51%6%14%19%8%
1617
November1st to 15thDay
46%313%23%12%2
1582
16th to endDay
52%5%16%20%5%
1524
December1st to 15thDay
54%5%16%15%7%
1440
16th to endDay
64%5%10%12%6%
1536
January1st to 15thNight
54%5%9%18%11%
2506
16th to endNight
53%6%13%17%7%
2688
February1st to 15thNight
48%411%22%10%2
2244
16th to endNight
50%6%11%20%10%1
1893
March1st to 15thNight
45%6%14%19%13%1
2160
16th to endNight
48%5%12%23%9%1
2011
April1st to 15thNight
50%48%19%16%1
1797
16th to endNight
47%410%19%14%2
1712
May1st to 15thNight
48%6%11%21%12%
1544
16th to endNight
36%7%13%22%15%2
1498
June1st to 15thNight
35%6%12%28%15%
1440
16th to endNight
34%7%14%23%18%1
1440
July1st to 15thNight
25%7%13%28%21%3
1360
16th to endNight
26%8%16%27%17%4
1417
August1st to 15thNight
24%7%15%33%17%1
1499
16th to endNight
33%6%12%28%17%2
1910
September1st to 15thNight
30%5%10%28%24%1
1750
16th to endNight
33%6%10%34%12%
1812
October1st to 15thNight
38%5%11%26%16%1
1912
16th to endNight
45%6%15%21%10%
2255
November1st to 15thNight
41%411%23%15%2
2276
16th to endNight
51%5%16%18%6%1
2433
December1st to 15thNight
53%5%14%18%8%
2520
16th to endNight
60%5%12%14%6%
2688

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%10%46%18%5%
90
16th to endDay
18%5%41%27%6%1
96
February1st to 15thDay
20%21%40%12%6%
90
16th to endDay
29%13%35%16%22
81
March1st to 15thDay
30%17%31%15%32
90
16th to endDay
28%5%30%23%10%1
240
April1st to 15thDay
26%8%32%21%10%
270
16th to endDay
22%10%29%21%13%2
270
May1st to 15thDay
23%13%30%22%7%2
363
16th to endDay
14%9%33%25%12%4
517
June1st to 15thDay
12%5%33%29%13%4
495
16th to endDay
11%9%31%30%11%5%
495
July1st to 15thDay
9%428%27%21%7%
475
16th to endDay
6%332%28%21%7%
515
August1st to 15thDay
11%321%31%22%9%
438
16th to endDay
16%6%17%26%21%11%
332
September1st to 15thDay
9%426%27%20%11%
294
16th to endDay
14%8%19%28%22%7%
254
October1st to 15thDay
16%8%24%29%14%5%
156
16th to endDay
19%12%42%16%8%
96
November1st to 15thDay
6%18%27%32%11%3
90
16th to endDay
30%12%38%7%11%
90
December1st to 15thDay
16%25%40%15%2
90
16th to endDay
35%21%33%8%1
96
January1st to 15thNight
21%13%38%20%5%
900
16th to endNight
17%12%42%22%4
960
February1st to 15thNight
19%15%34%24%5%
833
16th to endNight
20%13%31%26%6%
631
March1st to 15thNight
19%11%35%22%8%
720
16th to endNight
18%8%32%30%9%1
621
April1st to 15thNight
23%7%37%23%7%
539
16th to endNight
22%8%32%27%8%1
540
May1st to 15thNight
20%6%33%30%7%
540
16th to endNight
12%5%29%35%15%1
563
June1st to 15thNight
12%326%39%16%1
540
16th to endNight
10%328%39%16%1
540
July1st to 15thNight
7%21%42%24%2
510
16th to endNight
6%124%37%27%2
564
August1st to 15thNight
6%115%47%26%2
539
16th to endNight
10%219%38%24%4
573
September1st to 15thNight
10%323%30%24%7%
525
16th to endNight
13%5%22%28%24%4
654
October1st to 15thNight
16%8%28%30%14%1
660
16th to endNight
19%11%32%25%10%
704
November1st to 15thNight
17%12%35%23%10%1
700
16th to endNight
22%13%31%24%7%
813
December1st to 15thNight
23%14%37%20%4
900
16th to endNight
25%12%38%18%4
960
Page generated at 2017-09-11 18:35:20. Version ac04

Copyright 2017 A. Danko


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