Mequon Rotary Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Mequon Rotary Park clear sky chart from 2005-11-06 to 2024-03-18.

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
38%
24965
17%
80802
11%
24868
45%
24868
21%
54513

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
18%
941
13%
4367
4%
926
28%
926
10%
3092
January11th to 20thNight
18%
948
11%
4374
4%
930
26%
930
8%
3418
January21st to endNight
20%
1037
8%
4835
4%
1023
28%
1023
9%
3673
February1st to 10thNight
22%
941
14%
2466
4%
941
30%
941
19%
1800
February11th to 20thNight
26%
740
20%
2219
8%
740
37%
740
20%
1482
February21st to endNight
22%
628
19%
1884
5%
628
35%
628
19%
1296
March1st to 10thNight
31%
760
15%
2280
7%
760
37%
760
19%
1565
March11th to 20thNight
36%
744
21%
2220
11%
744
45%
744
28%
1365
March21st to endNight
38%
594
17%
1980
14%
594
43%
594
18%
1396
April1st to 10thNight
35%
540
15%
1800
11%
540
44%
540
19%
1193
April11th to 20thNight
36%
533
20%
1775
16%
533
44%
533
20%
1182
April21st to endNight
46%
540
19%
1666
13%
540
52%
540
25%
1073
May1st to 10thNight
46%
540
16%
1620
12%
540
49%
540
23%
1103
May11th to 20thNight
45%
531
19%
1421
13%
531
49%
531
27%
973
May21st to endNight
56%
583
16%
1552
12%
582
59%
582
31%
1016
June1st to 10thNight
62%
540
16%
1440
11%
540
65%
540
35%
899
June11th to 20thNight
55%
540
18%
1440
12%
540
58%
540
34%
912
June21st to endNight
60%
540
18%
1440
12%
540
63%
540
35%
899
July1st to 10thNight
75%
525
17%
1400
13%
525
76%
525
43%
828
July11th to 20thNight
68%
522
21%
1392
16%
522
70%
522
42%
812
July21st to endNight
70%
591
22%
1487
16%
558
72%
558
43%
867
August1st to 10thNight
72%
537
23%
1435
18%
534
73%
534
42%
820
August11th to 20thNight
68%
534
22%
1706
21%
534
72%
534
38%
921
August21st to endNight
66%
594
24%
1980
23%
594
71%
594
36%
1079
September1st to 10thNight
62%
540
24%
1800
23%
540
66%
540
31%
1018
September11th to 20thNight
61%
635
31%
1895
27%
635
66%
635
37%
1080
September21st to endNight
47%
720
24%
1980
16%
720
53%
720
30%
1270
October1st to 10thNight
46%
720
22%
2032
16%
720
51%
720
30%
1274
October11th to 20thNight
32%
720
19%
2199
10%
720
43%
720
24%
1423
October21st to endNight
31%
792
16%
2574
10%
792
40%
792
19%
1746
November1st to 10thNight
36%
740
25%
2406
17%
740
49%
740
25%
1467
November11th to 20thNight
24%
760
18%
2470
7%
760
36%
760
17%
1669
November21st to endNight
25%
878
17%
2588
7%
878
36%
878
20%
1770
December1st to 10thNight
18%
950
13%
2660
5%
950
26%
950
15%
1986
December11th to 20thNight
20%
950
12%
3209
3%
948
28%
948
12%
2365
December21st to endNight
14%
1037
6%
4810
2%
1026
22%
1026
7%
3781

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%46%6%35%5%6%8%37%
78532
Night
15%9%47%5%35%5%5%7%36%
81305
TransparencyDay
46%413%25%12%1
78233
Night
49%311%23%12%1
81125
SeeingDay
15%6%26%31%18%4
14910
Night
19%7%27%29%16%3
24996

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
13%13%6%9%6%35%6%5%8%27%
2527
11th to 20thDay
11%12%6%12%6%36%9%11%6%19%
2530
21st to endDay
17%16%8%9%6%3445%6%20%
2783
February1st to 10thDay
11%12%7%8%6%46%6%5%7%29%
1708
11th to 20thDay
13%10%5%6%5%45%5%6%6%35%
1848
21st to endDay
12%11%5%9%6%36%5%5%5%32%
1570
March1st to 10thDay
13%8%47%7%35%5%5%6%35%
1900
11th to 20thDay
11%8%37%6%35%5%5%7%39%
1918
21st to endDay
18%9%5%7%5%445%5%8%30%
2376
April1st to 10thDay
17%10%46%6%35%5%5%7%31%
2160
11th to 20thDay
16%8%36%7%45%5%6%7%34%
2134
21st to endDay
17%9%35%6%36%46%6%34%
2294
May1st to 10thDay
15%8%37%6%35%6%7%8%33%
2340
11th to 20thDay
16%6%36%6%35%5%5%7%38%
2469
21st to endDay
12%6%35%6%35%6%6%10%40%
2725
June1st to 10thDay
9%5%25%6%45%5%6%9%44%
2520
11th to 20thDay
11%5%25%6%35%5%6%8%44%
2520
21st to endDay
8%425%5%45%5%8%9%45%
2520
July1st to 10thDay
6%4245%35%6%6%10%50%
2520
11th to 20thDay
6%4246%45%47%10%49%
2520
21st to endDay
6%4245%35%6%6%10%51%
2743
August1st to 10thDay
8%3145%36%6%8%9%47%
2494
11th to 20thDay
9%425%5%35%5%6%9%46%
2192
21st to endDay
8%5%25%5%26%5%6%9%47%
2376
September1st to 10thDay
11%5%25%5%35%47%7%45%
2160
11th to 20thDay
12%5%245%35%448%49%
2046
21st to endDay
12%6%35%6%45%46%9%41%
1980
October1st to 10thDay
14%6%26%4345%5%7%44%
1926
11th to 20thDay
19%8%37%6%45%5%6%6%30%
1760
21st to endDay
17%7%37%7%345%46%36%
1782
November1st to 10thDay
12%7%37%5%35%45%7%42%
1672
11th to 20thDay
11%10%48%8%5%6%5%6%7%30%
1710
21st to endDay
18%11%35%5%33446%38%
1588
December1st to 10thDay
16%12%6%7%7%5%6%46%6%26%
1520
11th to 20thDay
13%12%48%7%47%6%6%7%27%
1918
21st to endDay
19%20%8%11%6%35%5%35%17%
2783
January1st to 10thNight
16%14%8%8%5%345%46%28%
4428
11th to 20thNight
14%14%7%12%8%46%7%8%5%17%
4440
21st to endNight
17%17%6%10%6%34446%22%
4884
February1st to 10thNight
13%13%6%7%6%35%5%6%6%31%
2466
11th to 20thNight
13%10%46%6%36%5%5%6%39%
2218
21st to endNight
19%12%36%5%35%35%6%35%
1884
March1st to 10thNight
15%9%5%7%6%35%5%5%6%35%
2280
11th to 20thNight
12%6%35%5%345%5%9%43%
2220
21st to endNight
19%8%47%6%35%5%46%33%
1980
April1st to 10thNight
16%9%36%5%35%5%46%37%
1800
11th to 20thNight
21%8%36%5%34446%38%
1775
21st to endNight
18%7%3443445%8%40%
1666
May1st to 10thNight
16%8%36%7%35%5%7%9%32%
1620
11th to 20thNight
18%7%35%435%5%5%7%37%
1421
21st to endNight
12%6%36%6%345%5%8%42%
1551
June1st to 10thNight
11%4245%35%7%5%8%47%
1440
11th to 20thNight
13%6%35%4345%5%9%44%
1440
21st to endNight
9%6%35%5%3445%8%48%
1440
July1st to 10thNight
7%3244345%7%9%52%
1440
11th to 20thNight
6%3246%345%7%8%53%
1440
21st to endNight
6%414435%5%6%10%52%
1575
August1st to 10thNight
6%4245%25%5%7%12%49%
1444
11th to 20thNight
9%3244345%7%8%52%
1706
21st to endNight
9%325%4345%5%7%52%
1980
September1st to 10thNight
10%425%5%345%6%7%50%
1800
11th to 20thNight
12%415%42445%6%54%
1895
21st to endNight
14%6%36%5%3345%7%46%
1980
October1st to 10thNight
15%6%25%43435%7%46%
2032
11th to 20thNight
19%7%345%2445%6%41%
2199
21st to endNight
20%9%36%5%3445%7%34%
2574
November1st to 10thNight
12%7%35%5%25%447%46%
2406
11th to 20thNight
14%10%37%6%36%5%5%6%35%
2470
21st to endNight
17%9%45%5%45%45%7%36%
2588
December1st to 10thNight
16%13%38%6%37%5%5%6%27%
2660
11th to 20thNight
15%14%5%8%6%46%5%5%6%27%
3279
21st to endNight
22%18%49%6%45%446%19%
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
59%215%18%6%
2528
11th to 20thDay
61%213%21%3
2530
21st to endDay
67%29%18%4
2783
February1st to 10thDay
55%412%20%8%1
1708
11th to 20thDay
49%211%24%11%2
1858
21st to endDay
54%311%20%11%2
1570
March1st to 10thDay
49%314%24%8%2
1900
11th to 20thDay
46%313%23%13%2
1918
21st to endDay
53%414%20%8%1
2376
April1st to 10thDay
52%412%20%11%1
2160
11th to 20thDay
49%49%22%13%3
2134
21st to endDay
50%413%19%12%2
2294
May1st to 10thDay
47%5%11%26%10%1
2340
11th to 20thDay
45%411%25%12%2
2473
21st to endDay
40%6%13%25%15%2
2725
June1st to 10thDay
38%312%28%16%3
2520
11th to 20thDay
37%314%26%19%2
2520
21st to endDay
35%5%16%26%17%2
2520
July1st to 10thDay
30%5%13%34%15%3
2451
11th to 20thDay
31%5%14%31%17%2
2445
21st to endDay
29%5%17%29%16%4
2591
August1st to 10thDay
31%5%19%30%14%2
2479
11th to 20thDay
34%416%31%14%1
2192
21st to endDay
35%412%28%18%2
2376
September1st to 10thDay
37%5%11%30%15%2
2160
11th to 20thDay
35%312%35%14%1
2046
21st to endDay
41%312%32%12%1
1980
October1st to 10thDay
40%310%32%14%1
1926
11th to 20thDay
52%412%20%11%1
1760
21st to endDay
50%412%23%11%1
1782
November1st to 10thDay
43%312%27%13%1
1672
11th to 20thDay
53%414%22%7%
1710
21st to endDay
50%315%25%7%
1588
December1st to 10thDay
59%215%16%7%1
1520
11th to 20thDay
57%215%18%6%2
1915
21st to endDay
74%27%13%4
2783
January1st to 10thNight
60%110%20%9%1
4428
11th to 20thNight
67%29%16%6%
4440
21st to endNight
65%210%18%5%
4884
February1st to 10thNight
54%310%20%11%1
2466
11th to 20thNight
48%310%24%14%1
2219
21st to endNight
51%211%21%13%2
1884
March1st to 10thNight
51%313%22%9%2
2280
11th to 20thNight
40%314%25%15%3
2220
21st to endNight
53%410%21%10%1
1980
April1st to 10thNight
48%49%22%16%1
1800
11th to 20thNight
50%36%20%18%4
1775
21st to endNight
44%311%24%14%2
1666
May1st to 10thNight
48%311%25%12%1
1620
11th to 20thNight
46%311%22%15%2
1422
21st to endNight
41%412%24%16%3
1552
June1st to 10thNight
36%5%11%29%18%2
1440
11th to 20thNight
38%49%26%21%3
1440
21st to endNight
36%415%25%18%2
1440
July1st to 10thNight
29%414%31%18%4
1400
11th to 20thNight
29%413%30%20%4
1392
21st to endNight
29%415%27%20%5%
1487
August1st to 10thNight
28%5%17%32%15%3
1435
11th to 20thNight
29%416%33%16%1
1706
21st to endNight
31%312%30%21%3
1980
September1st to 10thNight
34%410%27%22%2
1800
11th to 20thNight
32%29%38%16%2
1895
21st to endNight
41%38%33%14%1
1980
October1st to 10thNight
40%39%31%16%1
2032
11th to 20thNight
45%313%23%16%1
2199
21st to endNight
50%313%22%11%1
2574
November1st to 10thNight
41%310%28%17%2
2406
11th to 20thNight
50%313%22%11%1
2470
21st to endNight
49%315%24%8%1
2588
December1st to 10thNight
58%211%21%7%1
2660
11th to 20thNight
59%212%18%9%1
3281
21st to endNight
69%29%15%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
19%10%33%27%10%1
270
11th to 20thDay
19%11%33%26%11%1
270
21st to endDay
22%6%31%31%8%2
297
February1st to 10thDay
13%12%40%25%8%1
270
11th to 20thDay
16%14%36%25%8%1
270
21st to endDay
19%11%43%24%4
225
March1st to 10thDay
13%13%46%24%5%
270
11th to 20thDay
17%10%37%25%10%2
287
21st to endDay
26%9%28%27%9%2
462
April1st to 10thDay
23%8%35%25%9%
420
11th to 20thDay
19%9%35%25%9%4
412
21st to endDay
23%6%29%26%15%2
420
May1st to 10thDay
22%5%32%32%8%2
423
11th to 20thDay
19%5%26%34%15%2
615
21st to endDay
15%422%28%24%8%
679
June1st to 10thDay
9%321%41%21%4
630
11th to 20thDay
14%321%37%20%5%
630
21st to endDay
10%320%40%24%4
630
July1st to 10thDay
7%212%35%33%10%
621
11th to 20thDay
8%319%37%27%7%
618
21st to endDay
5%218%42%29%4
684
August1st to 10thDay
9%211%38%32%8%
613
11th to 20thDay
10%316%31%29%11%
439
21st to endDay
9%315%37%27%8%
495
September1st to 10thDay
13%317%35%24%8%
450
11th to 20thDay
12%316%31%28%10%
450
21st to endDay
15%8%24%25%22%7%
450
October1st to 10thDay
19%6%24%26%20%5%
396
11th to 20thDay
22%11%28%27%11%1
270
21st to endDay
22%8%35%27%6%1
297
November1st to 10thDay
14%12%31%27%14%2
270
11th to 20thDay
15%16%36%24%10%
270
21st to endDay
26%9%37%21%8%
270
December1st to 10thDay
23%11%37%20%10%
270
11th to 20thDay
24%11%36%20%7%1
270
21st to endDay
25%14%37%20%31
297
January1st to 10thNight
20%13%37%22%7%
950
11th to 20thNight
23%12%36%23%6%1
950
21st to endNight
21%10%36%26%7%
1045
February1st to 10thNight
21%10%35%27%7%1
941
11th to 20thNight
20%10%37%27%6%
743
21st to endNight
26%10%35%24%4
628
March1st to 10thNight
18%9%32%29%12%1
760
11th to 20thNight
15%8%34%32%10%1
744
21st to endNight
23%5%24%35%11%2
594
April1st to 10thNight
21%7%29%31%11%1
540
11th to 20thNight
26%5%27%27%13%3
533
21st to endNight
23%421%35%16%2
540
May1st to 10thNight
17%421%40%16%2
540
11th to 20thNight
21%321%32%21%2
531
21st to endNight
14%216%34%27%8%
584
June1st to 10thNight
13%115%39%27%5%
540
11th to 20thNight
16%217%34%26%6%
540
21st to endNight
10%315%37%32%3
540
July1st to 10thNight
9%17%32%40%10%
525
11th to 20thNight
8%213%35%34%8%
522
21st to endNight
8%113%40%33%4
591
August1st to 10thNight
6%29%38%36%8%
537
11th to 20thNight
10%212%31%33%12%
534
21st to endNight
11%213%34%34%5%
594
September1st to 10thNight
11%215%34%29%9%
540
11th to 20thNight
12%415%29%29%10%
635
21st to endNight
18%7%19%24%24%9%
720
October1st to 10thNight
19%5%23%26%24%4
720
11th to 20thNight
23%8%32%26%11%1
720
21st to endNight
27%8%28%26%9%2
792
November1st to 10thNight
17%9%33%28%11%2
740
11th to 20thNight
20%15%35%22%8%
760
21st to endNight
22%12%35%24%7%
878
December1st to 10thNight
25%13%35%21%5%
950
11th to 20thNight
25%11%35%21%7%
950
21st to endNight
30%13%33%21%4
1045
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