Owatonna
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Owatonna 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
34%
24805
17%
74737
9%
24746
41%
24746
24%
49736

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
25%
950
12%
2648
5%
946
33%
946
19%
1940
January11th to 20thNight
24%
918
11%
2519
5%
918
28%
918
16%
1937
January21st to endNight
19%
990
11%
2574
3%
990
25%
990
15%
2007
February1st to 10thNight
22%
900
13%
2340
3%
900
29%
900
20%
1734
February11th to 20thNight
21%
879
18%
2274
5%
875
29%
875
23%
1593
February21st to endNight
25%
673
16%
1857
4%
673
35%
673
20%
1334
March1st to 10thNight
27%
594
15%
2034
9%
594
35%
594
20%
1331
March11th to 20thNight
28%
540
18%
1980
10%
540
40%
540
18%
1306
March21st to endNight
30%
594
14%
2160
11%
594
38%
594
17%
1479
April1st to 10thNight
26%
540
16%
1800
9%
540
38%
540
20%
1197
April11th to 20thNight
29%
533
16%
1775
12%
533
38%
533
18%
1230
April21st to endNight
30%
540
18%
1632
11%
540
40%
540
21%
1117
May1st to 10thNight
32%
540
15%
1549
8%
540
38%
540
24%
1032
May11th to 20thNight
37%
531
19%
1417
9%
531
44%
531
29%
931
May21st to endNight
42%
584
14%
1551
6%
582
46%
582
29%
1035
June1st to 10thNight
49%
540
19%
1440
7%
540
54%
540
38%
875
June11th to 20thNight
44%
540
16%
1440
7%
540
48%
540
33%
927
June21st to endNight
55%
540
19%
1440
8%
540
58%
540
45%
819
July1st to 10thNight
65%
525
17%
1400
9%
525
67%
525
49%
765
July11th to 20thNight
62%
522
23%
1392
11%
522
67%
522
48%
760
July21st to endNight
67%
591
24%
1548
17%
558
70%
558
52%
811
August1st to 10thNight
64%
537
22%
1601
19%
534
67%
534
38%
904
August11th to 20thNight
58%
534
24%
1600
22%
534
64%
534
38%
911
August21st to endNight
57%
594
23%
1908
23%
594
64%
594
40%
1003
September1st to 10thNight
54%
540
24%
1800
22%
540
61%
540
37%
948
September11th to 20thNight
46%
540
28%
1822
21%
540
58%
540
35%
986
September21st to endNight
40%
607
23%
2047
13%
607
52%
607
31%
1143
October1st to 10thNight
39%
720
22%
2160
14%
720
46%
720
30%
1322
October11th to 20thNight
30%
720
22%
2160
10%
720
40%
720
25%
1376
October21st to endNight
29%
792
19%
2376
9%
792
38%
792
21%
1588
November1st to 10thNight
28%
820
23%
2486
10%
820
41%
820
26%
1537
November11th to 20thNight
22%
950
17%
2660
7%
950
31%
950
19%
1893
November21st to endNight
23%
950
17%
2660
7%
950
32%
950
23%
1817
December1st to 10thNight
23%
950
10%
2660
3%
950
30%
950
18%
1943
December11th to 20thNight
19%
949
12%
3204
3%
948
27%
948
13%
2348
December21st to endNight
16%
1038
8%
4823
4%
1026
24%
1026
7%
3857

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%9%47%6%35%5%5%7%36%
74725
Night
12%9%47%6%3445%7%39%
75060
TransparencyDay
47%414%23%11%1
74429
Night
46%413%24%13%2
74876
SeeingDay
17%9%30%27%13%3
14797
Night
16%9%34%30%10%1
24813

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
7%11%6%10%9%6%7%7%5%7%24%
1517
11th to 20thDay
11%15%6%13%11%37%5%5%6%19%
1514
21st to endDay
9%14%7%12%11%5%7%6%6%7%17%
1782
February1st to 10thDay
8%11%6%11%9%5%7%7%6%6%24%
1620
11th to 20thDay
10%10%6%9%7%48%6%5%6%29%
1574
21st to endDay
15%9%5%9%8%46%6%5%7%27%
1399
March1st to 10thDay
14%11%5%10%6%45%5%5%7%29%
1944
11th to 20thDay
14%11%5%8%5%35%5%5%6%33%
1980
21st to endDay
19%12%47%5%35%5%5%5%30%
2196
April1st to 10thDay
18%11%5%7%5%4447%6%30%
2160
11th to 20thDay
19%12%5%6%5%34447%32%
2134
21st to endDay
22%10%47%6%35%5%45%29%
2326
May1st to 10thDay
17%8%37%7%35%5%6%7%32%
2408
11th to 20thDay
17%8%36%4245%6%8%37%
2479
21st to endDay
17%7%36%5%3445%8%38%
2725
June1st to 10thDay
12%5%25%5%35%46%8%46%
2520
11th to 20thDay
13%5%25%5%36%47%9%40%
2520
21st to endDay
11%5%25%5%45%5%7%10%41%
2520
July1st to 10thDay
7%3245%35%5%6%10%49%
2520
11th to 20thDay
8%324435%5%6%9%51%
2520
21st to endDay
7%3245%35%6%7%10%47%
2676
August1st to 10thDay
9%5%35%5%45%6%8%8%42%
2328
11th to 20thDay
13%6%35%44446%8%43%
2301
21st to endDay
8%5%24435%45%8%51%
2448
September1st to 10thDay
14%5%245%345%5%7%46%
2160
11th to 20thDay
12%6%3442445%7%49%
2134
21st to endDay
14%7%35%5%3446%7%43%
1893
October1st to 10thDay
17%7%35%5%3345%5%43%
1800
11th to 20thDay
16%10%35%33445%6%42%
1800
21st to endDay
18%12%46%5%2335%6%36%
1978
November1st to 10thDay
11%11%45%5%3445%7%40%
1588
11th to 20thDay
12%13%7%10%7%35%5%5%5%29%
1520
21st to endDay
13%11%47%6%34448%36%
1520
December1st to 10thDay
13%10%5%10%11%6%5%5%46%25%
1520
11th to 20thDay
10%12%6%10%7%46%6%5%7%26%
1918
21st to endDay
19%16%7%17%7%34345%16%
2783
January1st to 10thNight
8%9%5%10%9%46%6%6%6%30%
2648
11th to 20thNight
11%12%5%11%9%5%6%5%5%7%24%
2519
21st to endNight
12%14%7%11%8%446%6%6%23%
2574
February1st to 10thNight
8%13%6%10%8%46%45%6%31%
2340
11th to 20thNight
9%10%47%7%46%5%5%7%37%
2273
21st to endNight
13%9%48%7%45%45%5%34%
1857
March1st to 10thNight
13%10%47%5%35%5%5%6%37%
2034
11th to 20thNight
14%9%5%7%6%35%45%7%36%
1980
21st to endNight
17%11%5%6%5%345%5%7%33%
2160
April1st to 10thNight
15%10%47%5%3445%6%37%
1800
11th to 20thNight
20%11%46%5%3345%5%34%
1775
21st to endNight
19%10%37%42335%6%37%
1632
May1st to 10thNight
17%7%37%434347%40%
1549
11th to 20thNight
15%6%345%35%46%8%43%
1416
21st to endNight
14%7%36%435%5%6%9%39%
1551
June1st to 10thNight
9%325%5%35%45%9%50%
1440
11th to 20thNight
11%435%6%35%5%6%10%44%
1440
21st to endNight
9%41342345%8%56%
1440
July1st to 10thNight
6%3234245%7%9%56%
1440
11th to 20thNight
432343445%8%59%
1440
21st to endNight
5%3134235%5%9%60%
1639
August1st to 10thNight
7%4245%35%5%6%8%50%
1611
11th to 20thNight
9%5%24425%45%8%53%
1600
21st to endNight
7%425%42345%7%57%
1908
September1st to 10thNight
10%424423346%57%
1800
11th to 20thNight
12%425%423447%53%
1822
21st to endNight
11%6%24433347%52%
2047
October1st to 10thNight
14%6%25%4335%46%49%
2160
11th to 20thNight
16%8%25%434447%42%
2160
21st to endNight
18%10%46%42345%6%38%
2376
November1st to 10thNight
11%9%35%5%2445%7%45%
2486
11th to 20thNight
12%12%6%10%6%34345%36%
2660
21st to endNight
14%10%5%7%6%24346%39%
2660
December1st to 10thNight
9%11%5%10%8%45%5%6%7%29%
2660
11th to 20thNight
11%12%5%11%8%5%5%5%5%6%28%
3279
21st to endNight
21%14%6%13%8%34445%18%
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%5%12%18%6%
1518
11th to 20thDay
66%49%13%8%
1514
21st to endDay
65%412%10%7%1
1782
February1st to 10thDay
59%412%15%8%1
1620
11th to 20thDay
55%5%11%21%7%2
1583
21st to endDay
56%411%19%9%1
1399
March1st to 10thDay
56%5%13%18%8%1
1944
11th to 20thDay
53%412%22%8%1
1980
21st to endDay
57%412%21%6%1
2196
April1st to 10thDay
54%411%21%9%1
2160
11th to 20thDay
54%312%19%11%1
2134
21st to endDay
57%411%19%8%1
2326
May1st to 10thDay
51%5%14%22%7%1
2408
11th to 20thDay
45%5%13%25%10%1
2483
21st to endDay
45%414%23%12%1
2725
June1st to 10thDay
36%5%15%30%12%1
2520
11th to 20thDay
40%5%15%24%16%1
2520
21st to endDay
38%5%18%26%11%2
2520
July1st to 10thDay
31%5%17%33%13%1
2451
11th to 20thDay
31%5%15%30%17%3
2445
21st to endDay
30%5%18%31%14%3
2527
August1st to 10thDay
37%5%16%30%9%3
2314
11th to 20thDay
39%5%15%29%12%1
2301
21st to endDay
31%5%13%30%19%1
2448
September1st to 10thDay
38%412%31%15%1
2160
11th to 20thDay
35%416%32%12%1
2134
21st to endDay
41%411%31%12%1
1893
October1st to 10thDay
43%410%27%14%1
1800
11th to 20thDay
44%314%24%14%1
1800
21st to endDay
50%313%24%10%1
1978
November1st to 10thDay
43%414%21%15%3
1588
11th to 20thDay
56%412%19%10%1
1520
21st to endDay
49%417%22%8%1
1520
December1st to 10thDay
60%416%12%7%1
1520
11th to 20thDay
57%319%15%6%
1915
21st to endDay
72%39%12%41
2783
January1st to 10thNight
53%5%13%19%10%
2648
11th to 20thNight
60%413%16%7%
2519
21st to endNight
61%412%15%8%1
2574
February1st to 10thNight
55%211%21%9%1
2340
11th to 20thNight
47%412%24%11%2
2274
21st to endNight
52%310%21%12%2
1857
March1st to 10thNight
47%415%25%8%1
2034
11th to 20thNight
49%411%23%12%1
1980
21st to endNight
52%413%21%8%2
2160
April1st to 10thNight
48%410%22%14%1
1800
11th to 20thNight
52%410%17%14%3
1775
21st to endNight
49%49%23%14%2
1632
May1st to 10thNight
45%414%22%14%1
1549
11th to 20thNight
40%5%14%25%12%3
1417
21st to endNight
42%413%22%16%2
1552
June1st to 10thNight
32%5%13%32%16%2
1440
11th to 20thNight
37%5%14%22%18%3
1440
21st to endNight
27%317%31%19%2
1440
July1st to 10thNight
23%415%37%18%2
1400
11th to 20thNight
23%5%17%33%19%4
1392
21st to endNight
21%416%37%18%4
1548
August1st to 10thNight
31%415%31%17%3
1601
11th to 20thNight
31%416%29%18%2
1600
21st to endNight
27%415%30%20%4
1908
September1st to 10thNight
29%412%32%22%1
1800
11th to 20thNight
32%315%32%18%1
1822
21st to endNight
34%212%33%18%1
2047
October1st to 10thNight
38%49%30%16%3
2160
11th to 20thNight
42%413%24%15%2
2160
21st to endNight
48%312%23%14%1
2376
November1st to 10thNight
40%414%24%16%2
2486
11th to 20thNight
52%412%19%13%1
2660
21st to endNight
48%315%24%9%1
2660
December1st to 10thNight
54%416%18%7%1
2660
11th to 20thNight
57%414%18%6%1
3281
21st to endNight
69%39%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
16%10%40%23%9%3
270
11th to 20thDay
19%10%41%25%42
249
21st to endDay
15%9%42%25%8%1
264
February1st to 10thDay
11%16%46%25%2
240
11th to 20thDay
17%14%40%25%5%1
240
21st to endDay
25%12%35%24%4
198
March1st to 10thDay
15%16%44%18%7%
240
11th to 20thDay
21%11%36%23%8%2
240
21st to endDay
31%11%28%19%10%1
282
April1st to 10thDay
27%12%34%20%6%
420
11th to 20thDay
25%17%23%26%8%1
412
21st to endDay
27%13%27%20%10%3
586
May1st to 10thDay
22%12%32%25%7%2
603
11th to 20thDay
23%11%27%26%10%4
625
21st to endDay
20%8%27%26%16%3
679
June1st to 10thDay
11%7%25%32%19%6%
630
11th to 20thDay
15%6%30%34%12%3
630
21st to endDay
13%7%31%28%15%5%
630
July1st to 10thDay
6%321%35%25%9%
621
11th to 20thDay
8%6%29%30%21%7%
618
21st to endDay
9%223%38%22%6%
684
August1st to 10thDay
10%420%36%24%6%
626
11th to 20thDay
15%420%31%25%6%
615
21st to endDay
10%429%32%18%7%
567
September1st to 10thDay
16%6%28%30%15%4
450
11th to 20thDay
13%6%30%32%15%4
424
21st to endDay
19%12%31%25%9%4
270
October1st to 10thDay
20%9%26%27%14%4
270
11th to 20thDay
20%15%38%20%7%1
270
21st to endDay
28%17%33%14%7%1
297
November1st to 10thDay
17%14%36%24%9%1
270
11th to 20thDay
17%20%41%17%5%
270
21st to endDay
19%13%43%22%3
270
December1st to 10thDay
16%10%42%25%6%1
270
11th to 20thDay
17%14%39%23%6%1
270
21st to endDay
28%14%37%17%4
297
January1st to 10thNight
13%11%41%27%8%
950
11th to 20thNight
17%12%36%28%6%1
918
21st to endNight
19%11%37%27%6%
990
February1st to 10thNight
15%11%42%26%5%1
900
11th to 20thNight
14%14%43%22%6%1
879
21st to endNight
18%13%35%26%8%1
673
March1st to 10thNight
19%9%38%24%9%1
594
11th to 20thNight
20%8%36%27%9%1
540
21st to endNight
23%9%30%25%10%2
594
April1st to 10thNight
19%14%37%26%5%
540
11th to 20thNight
25%10%32%26%6%1
533
21st to endNight
25%8%31%27%7%2
540
May1st to 10thNight
22%9%31%30%8%1
540
11th to 20thNight
19%7%31%32%10%1
531
21st to endNight
17%6%28%35%13%1
584
June1st to 10thNight
11%428%41%14%1
540
11th to 20thNight
13%5%31%41%10%
540
21st to endNight
10%327%42%17%1
540
July1st to 10thNight
8%120%41%27%3
525
11th to 20thNight
5%425%41%23%2
522
21st to endNight
5%219%50%21%2
591
August1st to 10thNight
8%218%44%26%2
537
11th to 20thNight
10%222%37%23%4
534
21st to endNight
8%226%41%20%3
594
September1st to 10thNight
13%424%40%16%4
540
11th to 20thNight
12%431%34%16%2
540
21st to endNight
14%8%34%30%13%1
607
October1st to 10thNight
16%8%31%29%15%1
720
11th to 20thNight
20%11%36%27%7%1
720
21st to endNight
24%11%30%28%7%
792
November1st to 10thNight
18%12%37%25%7%1
820
11th to 20thNight
18%13%40%22%6%
950
21st to endNight
18%13%41%22%7%
950
December1st to 10thNight
15%11%40%27%6%1
950
11th to 20thNight
19%8%42%24%7%
950
21st to endNight
24%13%35%24%5%
1045
Page generated at 2024-01-11 03:22:40. Version ac07

Copyright 2024 Attilla Danko


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