Waseca
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Waseca clear sky chart from 2005-11-05 to 2024-10-14.

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%
25597
16%
95286
9%
25382
41%
25382
19%
61595

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
24%
942
8%
4409
5%
926
32%
926
10%
3461
January11th to 20thNight
24%
945
11%
4245
5%
930
29%
930
9%
3177
January21st to endNight
20%
1033
7%
4483
4%
1023
25%
1023
9%
3487
February1st to 10thNight
24%
950
14%
2470
4%
950
30%
950
20%
1820
February11th to 20thNight
22%
929
17%
2404
5%
925
30%
925
23%
1681
February21st to endNight
26%
725
16%
1981
5%
725
35%
725
22%
1405
March1st to 10thNight
26%
607
28%
3434
8%
593
36%
593
15%
1772
March11th to 20thNight
27%
566
22%
3423
11%
550
39%
550
13%
1781
March21st to endNight
29%
625
9%
3710
11%
605
37%
605
9%
2688
April1st to 10thNight
27%
570
16%
1900
10%
570
38%
570
19%
1275
April11th to 20thNight
27%
563
16%
1870
11%
563
38%
563
18%
1290
April21st to endNight
30%
570
17%
1710
10%
570
40%
570
21%
1181
May1st to 10thNight
32%
568
21%
2703
9%
559
38%
559
16%
1571
May11th to 20thNight
38%
548
17%
2435
9%
541
45%
541
21%
1286
May21st to endNight
40%
608
12%
2714
6%
593
45%
593
18%
1577
June1st to 10thNight
48%
570
18%
1520
7%
570
53%
570
36%
943
June11th to 20thNight
44%
570
15%
1520
7%
570
47%
570
31%
991
June21st to endNight
54%
570
18%
1520
8%
570
57%
570
42%
882
July1st to 10thNight
63%
543
13%
2406
8%
535
66%
535
27%
1349
July11th to 20thNight
62%
537
21%
2167
11%
533
66%
533
36%
1019
July21st to endNight
66%
609
17%
2612
16%
569
71%
569
33%
1256
August1st to 10thNight
62%
558
22%
2623
20%
545
66%
545
22%
1523
August11th to 20thNight
59%
548
18%
2545
21%
543
66%
543
24%
1425
August21st to endNight
55%
611
18%
3128
22%
605
63%
605
25%
1609
September1st to 10thNight
55%
570
25%
1900
24%
570
62%
570
38%
991
September11th to 20thNight
46%
570
27%
1943
21%
570
57%
570
33%
1070
September21st to endNight
41%
632
23%
2152
14%
632
53%
632
31%
1201
October1st to 10thNight
39%
760
24%
2280
15%
760
47%
760
31%
1372
October11th to 20thNight
30%
735
22%
2208
9%
735
40%
735
25%
1418
October21st to endNight
30%
792
19%
2376
9%
792
39%
792
21%
1597
November1st to 10thNight
28%
836
23%
2488
9%
836
42%
836
26%
1560
November11th to 20thNight
23%
950
17%
2660
6%
950
32%
950
19%
1917
November21st to endNight
23%
950
17%
2660
7%
950
31%
950
22%
1823
December1st to 10thNight
23%
950
10%
2660
3%
950
29%
950
17%
1963
December11th to 20thNight
19%
949
11%
3207
3%
948
27%
948
13%
2355
December21st to endNight
17%
1038
8%
4820
4%
1026
24%
1026
7%
3879

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%38%5%4446%7%37%
101329
Night
12%9%38%5%4435%6%39%
97333
TransparencyDay
46%6%13%24%11%1
101124
Night
45%5%12%23%13%1
97214
SeeingDay
17%10%31%27%13%3
15916
Night
16%9%34%30%10%1
25744

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
9%17%7%20%6%6%6%445%16%
2527
11th to 20thDay
6%14%5%11%9%7%9%6%9%8%16%
2635
21st to endDay
9%19%8%17%9%5%435%418%
3135
February1st to 10thDay
8%11%6%12%10%6%6%5%6%6%24%
1710
11th to 20thDay
9%12%39%6%6%6%5%6%6%31%
1664
21st to endDay
13%12%310%7%5%446%6%30%
1471
March1st to 10thDay
14%8%37%44435%7%40%
3401
11th to 20thDay
11%9%38%445%36%8%39%
3480
21st to endDay
25%13%5%10%7%44345%21%
3833
April1st to 10thDay
18%11%37%5%4446%6%31%
2280
11th to 20thDay
19%13%46%5%3435%6%32%
2258
21st to endDay
22%12%37%5%45%35%5%29%
2470
May1st to 10thDay
17%7%26%5%45%5%7%7%35%
4178
11th to 20thDay
13%7%26%44446%8%43%
4399
21st to endDay
18%7%27%445%35%7%38%
4824
June1st to 10thDay
12%5%26%43445%8%47%
2660
11th to 20thDay
13%6%26%45%447%9%40%
2660
21st to endDay
11%6%26%45%5%47%9%41%
2660
July1st to 10thDay
10%6%37%5%5%5%5%8%10%39%
4440
11th to 20thDay
5%315%34436%8%57%
4440
21st to endDay
6%425%5%5%5%5%7%10%47%
4659
August1st to 10thDay
12%7%26%44436%8%44%
4104
11th to 20thDay
13%6%36%445%46%10%41%
4041
21st to endDay
8%5%36%44435%7%50%
4320
September1st to 10thDay
14%5%15%34435%7%48%
2280
11th to 20thDay
11%6%25%43435%7%49%
2233
21st to endDay
14%6%26%5%35%45%7%45%
2009
October1st to 10thDay
15%8%36%434346%45%
1900
11th to 20thDay
16%9%36%434346%42%
1830
21st to endDay
19%11%47%33335%6%36%
1980
November1st to 10thDay
11%10%47%44445%7%41%
1587
11th to 20thDay
11%14%5%11%5%45%45%5%30%
1520
21st to endDay
13%11%48%5%4336%7%35%
1520
December1st to 10thDay
13%11%413%9%7%5%346%26%
1520
11th to 20thDay
11%13%6%11%6%5%5%5%5%6%27%
1918
21st to endDay
19%16%7%18%5%43245%17%
2783
January1st to 10thNight
9%14%7%20%7%5%435%422%
4428
11th to 20thNight
7%11%5%14%9%7%8%6%9%5%20%
4330
21st to endNight
12%18%8%13%6%5%335%5%22%
4532
February1st to 10thNight
7%14%5%11%6%6%5%346%32%
2470
11th to 20thNight
8%11%47%6%6%5%45%7%38%
2403
21st to endNight
12%9%49%7%5%435%6%36%
1981
March1st to 10thNight
10%8%36%44435%7%47%
3479
11th to 20thNight
10%7%38%44446%8%42%
3480
21st to endNight
25%13%39%433335%29%
3796
April1st to 10thNight
14%12%36%5%4445%7%37%
1900
11th to 20thNight
20%10%47%44435%5%35%
1870
21st to endNight
19%11%37%43335%6%36%
1710
May1st to 10thNight
16%7%27%444346%44%
2727
11th to 20thNight
13%5%25%44435%7%49%
2506
21st to endNight
14%8%36%44436%7%43%
2743
June1st to 10thNight
11%425%44426%8%50%
1520
11th to 20thNight
11%426%5%5%446%8%44%
1520
21st to endNight
10%5%1433326%8%55%
1520
July1st to 10thNight
11%5%24445%47%9%45%
2530
11th to 20thNight
431333445%8%62%
2530
21st to endNight
5%32444436%9%57%
2901
August1st to 10thNight
12%6%25%434347%48%
2836
11th to 20thNight
13%5%2433436%7%52%
2798
21st to endNight
9%426%43335%7%52%
3338
September1st to 10thNight
9%415%323348%57%
1900
11th to 20thNight
10%5%25%33336%7%53%
1943
21st to endNight
10%6%25%433347%53%
2152
October1st to 10thNight
14%6%25%333346%51%
2280
11th to 20thNight
16%8%25%44335%7%43%
2203
21st to endNight
18%11%36%33435%6%39%
2376
November1st to 10thNight
12%9%36%44345%6%46%
2488
11th to 20thNight
11%12%5%10%5%44345%36%
2660
21st to endNight
13%11%47%5%44347%39%
2660
December1st to 10thNight
9%12%411%8%5%5%45%6%30%
2660
11th to 20thNight
12%11%5%11%7%5%5%45%6%28%
3279
21st to endNight
20%15%5%15%6%5%4345%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
69%7%9%12%4
2528
11th to 20thDay
62%411%16%7%
2635
21st to endDay
70%5%10%11%4
3135
February1st to 10thDay
59%5%12%15%8%1
1710
11th to 20thDay
53%6%12%21%7%1
1673
21st to endDay
54%5%12%18%11%1
1471
March1st to 10thDay
43%6%12%26%12%1
3401
11th to 20thDay
42%411%30%11%2
3480
21st to endDay
67%49%14%5%
3833
April1st to 10thDay
52%6%11%20%10%1
2280
11th to 20thDay
54%5%10%19%12%1
2258
21st to endDay
57%5%11%18%8%1
2470
May1st to 10thDay
44%6%13%23%12%1
4216
11th to 20thDay
37%7%11%30%12%2
4403
21st to endDay
45%7%12%25%11%1
4837
June1st to 10thDay
35%6%14%29%14%1
2660
11th to 20thDay
40%7%13%22%16%1
2660
21st to endDay
38%7%16%26%11%2
2660
July1st to 10thDay
40%7%20%24%9%1
4371
11th to 20thDay
25%5%14%35%19%2
4365
21st to endDay
30%8%15%30%15%2
4512
August1st to 10thDay
39%412%30%13%2
4090
11th to 20thDay
40%6%15%30%10%
4080
21st to endDay
34%5%16%29%15%1
4319
September1st to 10thDay
35%6%12%31%16%
2280
11th to 20thDay
35%6%15%31%13%1
2233
21st to endDay
40%5%10%30%14%1
2009
October1st to 10thDay
42%5%9%29%15%1
1900
11th to 20thDay
44%5%12%24%13%2
1830
21st to endDay
49%5%13%22%11%1
1980
November1st to 10thDay
43%6%14%19%15%3
1587
11th to 20thDay
55%5%11%18%10%1
1520
21st to endDay
48%5%17%21%8%1
1520
December1st to 10thDay
61%5%14%12%7%1
1520
11th to 20thDay
56%6%19%14%5%
1915
21st to endDay
71%410%11%31
2783
January1st to 10thNight
65%410%15%5%
4428
11th to 20thNight
61%5%11%17%6%
4330
21st to endNight
65%410%14%6%
4532
February1st to 10thNight
53%411%21%9%1
2470
11th to 20thNight
46%5%13%24%10%2
2404
21st to endNight
49%411%22%12%2
1981
March1st to 10thNight
37%5%11%30%15%1
3479
11th to 20thNight
40%49%28%17%1
3480
21st to endNight
60%48%18%8%2
3796
April1st to 10thNight
47%5%11%22%14%1
1900
11th to 20thNight
50%5%10%16%16%3
1870
21st to endNight
49%5%8%22%14%2
1710
May1st to 10thNight
41%5%11%19%22%1
2754
11th to 20thNight
34%6%11%26%18%5%
2507
21st to endNight
40%7%10%27%17%1
2751
June1st to 10thNight
32%7%12%31%16%2
1520
11th to 20thNight
37%7%13%21%19%3
1520
21st to endNight
28%5%16%30%19%3
1520
July1st to 10thNight
34%5%20%27%12%1
2490
11th to 20thNight
22%415%37%21%2
2482
21st to endNight
24%6%17%31%20%2
2809
August1st to 10thNight
37%5%11%28%16%3
2826
11th to 20thNight
32%6%14%31%15%1
2825
21st to endNight
31%419%26%17%2
3338
September1st to 10thNight
27%413%33%22%1
1900
11th to 20thNight
30%6%14%31%18%1
1943
21st to endNight
33%411%31%19%1
2152
October1st to 10thNight
36%5%9%30%17%3
2280
11th to 20thNight
41%5%12%24%16%2
2208
21st to endNight
46%5%12%23%14%1
2376
November1st to 10thNight
40%5%14%24%16%3
2488
11th to 20thNight
50%6%11%19%13%1
2660
21st to endNight
47%415%24%9%1
2660
December1st to 10thNight
54%5%14%18%7%1
2660
11th to 20thNight
56%5%14%18%6%1
3281
21st to endNight
68%5%9%14%4
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
14%13%35%25%9%3
270
11th to 20thDay
19%11%40%25%41
270
21st to endDay
15%8%41%25%9%2
297
February1st to 10thDay
11%16%45%25%31
270
11th to 20thDay
16%14%40%25%6%
270
21st to endDay
23%13%37%24%3
225
March1st to 10thDay
16%16%43%20%6%
270
11th to 20thDay
24%12%33%24%7%1
270
21st to endDay
31%11%28%19%9%1
304
April1st to 10thDay
27%14%34%20%5%
460
11th to 20thDay
27%16%25%23%8%1
456
21st to endDay
26%13%27%22%8%3
650
May1st to 10thDay
21%13%34%23%8%2
653
11th to 20thDay
20%12%28%25%11%4
675
21st to endDay
20%9%27%25%16%3
734
June1st to 10thDay
12%7%26%33%18%5%
680
11th to 20thDay
14%8%33%33%10%3
680
21st to endDay
13%8%30%28%16%5%
680
July1st to 10thDay
6%425%32%23%9%
671
11th to 20thDay
7%6%29%30%20%8%
668
21st to endDay
8%223%39%21%6%
739
August1st to 10thDay
11%421%33%25%5%
676
11th to 20thDay
14%422%31%23%6%
665
21st to endDay
11%332%32%17%6%
627
September1st to 10thDay
17%6%28%30%16%4
490
11th to 20thDay
12%6%32%29%17%3
443
21st to endDay
14%14%29%26%11%5%
300
October1st to 10thDay
21%10%25%26%15%4
300
11th to 20thDay
19%15%39%19%6%
279
21st to endDay
29%18%31%15%8%
297
November1st to 10thDay
15%18%35%22%10%1
270
11th to 20thDay
18%19%41%17%4
270
21st to endDay
19%14%42%21%3
270
December1st to 10thDay
17%10%41%24%6%1
270
11th to 20thDay
17%15%40%21%6%1
270
21st to endDay
26%16%36%19%4
297
January1st to 10thNight
12%12%41%27%7%
950
11th to 20thNight
17%11%38%28%6%1
950
21st to endNight
19%11%36%28%7%
1045
February1st to 10thNight
14%12%40%28%5%1
950
11th to 20thNight
14%12%44%24%5%1
929
21st to endNight
17%12%35%28%7%1
725
March1st to 10thNight
19%10%40%23%8%1
608
11th to 20thNight
19%9%38%26%7%
570
21st to endNight
24%9%31%24%10%1
627
April1st to 10thNight
19%14%37%26%4
570
11th to 20thNight
25%12%32%25%6%1
563
21st to endNight
23%10%33%26%7%2
570
May1st to 10thNight
20%9%32%31%7%1
570
11th to 20thNight
18%7%31%33%10%1
561
21st to endNight
17%8%29%34%12%
617
June1st to 10thNight
12%431%40%13%1
570
11th to 20thNight
12%5%34%39%10%
570
21st to endNight
11%328%41%16%1
570
July1st to 10thNight
7%222%41%26%2
555
11th to 20thNight
5%327%40%24%2
552
21st to endNight
5%220%51%21%2
624
August1st to 10thNight
10%219%45%23%2
567
11th to 20thNight
11%220%40%23%4
564
21st to endNight
8%226%40%21%3
627
September1st to 10thNight
12%424%41%16%3
570
11th to 20thNight
12%5%31%33%15%2
570
21st to endNight
12%9%33%31%14%1
632
October1st to 10thNight
17%7%32%29%14%1
760
11th to 20thNight
18%11%36%27%6%1
735
21st to endNight
24%11%31%28%6%
792
November1st to 10thNight
18%11%38%24%7%1
836
11th to 20thNight
17%13%41%23%6%
950
21st to endNight
17%13%41%22%7%
950
December1st to 10thNight
16%9%40%26%7%1
950
11th to 20thNight
19%8%41%25%6%1
950
21st to endNight
25%12%34%24%5%
1045
Page generated at 2024-10-11 09:50:00. Version ac07

Copyright © 2024 Attilla Danko.


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