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 2017-12-02.

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
36%
16418
17%
47846
9%
16371
43%
16371
24%
31813

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
27%
900
12%
2506
5%
895
33%
895
18%
1835
January16th to endNight
23%
960
12%
2511
5%
960
29%
960
17%
1906
February1st to 15thNight
25%
879
13%
2288
4%
875
31%
875
21%
1676
February16th to endNight
28%
752
17%
2014
6%
752
36%
752
24%
1403
March1st to 15thNight
29%
564
16%
2004
9%
564
38%
564
21%
1272
March16th to endNight
32%
576
14%
2106
11%
576
39%
576
16%
1464
April1st to 15thNight
30%
539
16%
1797
11%
539
41%
539
21%
1181
April16th to endNight
29%
540
17%
1677
10%
540
38%
540
18%
1204
May1st to 15thNight
35%
540
15%
1524
9%
540
40%
540
26%
1013
May16th to endNight
41%
563
16%
1498
6%
561
47%
561
29%
987
June1st to 15thNight
47%
540
14%
1440
5%
540
50%
540
32%
942
June16th to endNight
55%
540
18%
1440
8%
540
58%
540
42%
843
July1st to 15thNight
60%
510
16%
1360
6%
510
63%
510
46%
767
July16th to endNight
68%
564
23%
1469
15%
531
70%
531
46%
811
August1st to 15thNight
64%
539
23%
1610
21%
536
67%
536
38%
930
August16th to endNight
59%
573
22%
1795
21%
573
65%
573
38%
990
September1st to 15thNight
58%
540
24%
1800
23%
540
65%
540
37%
956
September16th to endNight
42%
576
23%
1986
14%
576
55%
576
30%
1122
October1st to 15thNight
36%
720
23%
2160
14%
720
44%
720
30%
1322
October16th to endNight
34%
768
19%
2304
10%
768
42%
768
23%
1513
November1st to 15thNight
29%
890
20%
2592
9%
890
40%
890
25%
1687
November16th to endNight
25%
975
17%
2730
8%
975
32%
975
21%
1905
December1st to 15thNight
22%
910
10%
2547
3%
910
28%
910
16%
1933
December16th to endNight
20%
960
12%
2688
4%
960
27%
960
13%
2151

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%3445%7%36%
48607
Night
12%8%36%5%24446%41%
48019
Cloud CoverDay
25%7%25%423346%31%
48618
Night
24%7%25%423335%36%
48023
Cloud CoverDay
14%8%36%5%3445%7%36%
48616
Night
12%8%35%5%24446%41%
48023
TransparencyDay
46%5%13%22%9%1
48298
Night
43%5%12%24%12%1
47846
SeeingDay
17%7%29%27%13%3
6335
Night
16%7%32%30%11%1
16419

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
8%12%6%10%9%45%446%25%
1432
16th to endDay
9%13%7%11%8%36%5%6%6%20%
1710
February1st to 15thDay
9%12%6%10%8%46%46%5%23%
1575
16th to endDay
13%9%39%5%35%6%6%6%29%
1458
March1st to 15thDay
16%11%5%6%5%34446%29%
1954
16th to endDay
18%9%46%6%25%35%6%30%
2118
April1st to 15thDay
17%9%36%5%3445%5%33%
2151
16th to endDay
23%12%35%424445%28%
2283
May1st to 15thDay
19%9%26%5%35%5%5%6%30%
2427
16th to endDay
15%5%35%43445%9%37%
2617
June1st to 15thDay
14%5%2442445%8%40%
2520
16th to endDay
9%5%245%3446%9%42%
2520
July1st to 15thDay
5%3144245%7%9%50%
2520
16th to endDay
7%324435%5%7%11%44%
2598
August1st to 15thDay
8%425%6%45%5%6%9%40%
2340
16th to endDay
11%5%25%42445%8%45%
2406
September1st to 15thDay
11%5%145%2345%7%47%
2160
16th to endDay
14%5%25%424346%44%
1959
October1st to 15thDay
17%7%24313345%44%
1800
16th to endDay
17%9%36%423345%38%
1920
November1st to 15thDay
11%10%36%423446%41%
1593
16th to endDay
14%9%36%5%245%5%7%35%
1560
December1st to 15thDay
16%11%6%8%9%445%46%21%
1450
16th to endDay
18%15%6%10%7%35%235%20%
1536
January1st to 15thNight
9%8%5%8%7%46%5%5%5%31%
2506
16th to endNight
11%12%5%10%7%35%45%6%27%
2511
February1st to 15thNight
9%13%48%6%34445%34%
2285
16th to endNight
9%8%45%7%3446%7%38%
2014
March1st to 15thNight
13%9%45%423347%41%
1992
16th to endNight
16%10%36%6%2445%6%33%
2106
April1st to 15thNight
16%9%35%3335%5%6%38%
1797
16th to endNight
22%10%35%423345%33%
1677
May1st to 15thNight
17%6%25%324236%44%
1524
16th to endNight
11%5%25%42446%9%42%
1496
June1st to 15thNight
11%326%5%4445%7%45%
1440
16th to endNight
7%224433349%55%
1440
July1st to 15thNight
42133145%5%8%57%
1440
16th to endNight
4213415%5%5%9%56%
1569
August1st to 15thNight
5%4245%2445%8%52%
1620
16th to endNight
9%314313247%57%
1795
September1st to 15thNight
10%31341335%6%56%
1800
16th to endNight
10%5%23423347%50%
1986
October1st to 15thNight
14%5%24422336%49%
2160
16th to endNight
17%8%34423347%40%
2304
November1st to 15thNight
13%8%35%424445%43%
2592
16th to endNight
12%10%36%5%33446%39%
2730
December1st to 15thNight
13%11%5%7%8%35%445%29%
2547
16th to endNight
18%14%6%10%6%34335%22%
2688

Percentage Cloud Cover SW (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
23%8%5%8%8%34446%22%
1432
16th to endDay
24%12%5%9%7%35%45%417%
1710
February1st to 15thDay
23%11%48%7%35%35%421%
1575
16th to endDay
25%9%28%5%3445%5%25%
1458
March1st to 15thDay
28%9%36%434345%25%
1965
16th to endDay
30%8%25%5%23345%26%
2118
April1st to 15thDay
30%8%25%5%2334427%
2151
16th to endDay
36%12%2432334422%
2283
May1st to 15thDay
32%7%15%434445%26%
2427
16th to endDay
30%5%25%323337%31%
2617
June1st to 15thDay
29%5%24423446%33%
2520
16th to endDay
24%5%24424447%35%
2520
July1st to 15thDay
21%31342346%8%40%
2520
16th to endDay
23%31333446%9%36%
2598
August1st to 15thDay
16%415%5%4446%7%38%
2340
16th to endDay
18%5%2442335%7%42%
2406
September1st to 15thDay
17%5%14423347%45%
2160
16th to endDay
20%424424346%41%
1959
October1st to 15thDay
24%5%3431333442%
1800
16th to endDay
24%8%26%323345%36%
1920
November1st to 15thDay
23%9%36%322345%37%
1593
16th to endDay
27%7%25%422445%33%
1560
December1st to 15thDay
31%9%46%8%445%3418%
1450
16th to endDay
30%13%410%6%2323417%
1536
January1st to 15thNight
23%7%46%6%35%5%4428%
2506
16th to endNight
26%10%48%6%33445%22%
2511
February1st to 15thNight
24%12%37%5%2223430%
2278
16th to endNight
22%7%25%7%23346%32%
2014
March1st to 15thNight
26%8%25%322325%36%
2004
16th to endNight
29%8%25%423345%29%
2106
April1st to 15thNight
29%8%1432244432%
1797
16th to endNight
35%9%2442323327%
1677
May1st to 15thNight
31%5%14323225%37%
1523
16th to endNight
27%5%24423347%34%
1496
June1st to 15thNight
25%315%434336%37%
1440
16th to endNight
23%213313337%45%
1440
July1st to 15thNight
20%21231245%7%46%
1440
16th to endNight
19%212313447%47%
1569
August1st to 15thNight
14%3135%2345%7%48%
1620
16th to endNight
15%313323236%54%
1795
September1st to 15thNight
16%313412346%52%
1800
16th to endNight
17%5%13323246%49%
1986
October1st to 15thNight
21%5%24322235%45%
2160
16th to endNight
23%7%23323246%38%
2304
November1st to 15thNight
24%8%25%32333439%
2592
16th to endNight
24%8%35%42233436%
2730
December1st to 15thNight
27%10%46%7%3333424%
2547
16th to endNight
30%12%5%9%5%2223419%
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
8%12%6%11%9%46%45%7%25%
1432
16th to endDay
9%13%7%11%9%36%5%7%5%20%
1710
February1st to 15thDay
9%12%7%9%9%46%46%5%24%
1575
16th to endDay
12%10%38%5%35%6%6%6%29%
1458
March1st to 15thDay
16%10%5%7%5%3445%6%29%
1965
16th to endDay
18%9%36%6%3435%6%31%
2116
April1st to 15thDay
17%9%36%6%2445%5%33%
2151
16th to endDay
23%12%35%423345%28%
2283
May1st to 15thDay
19%8%35%5%35%5%5%6%30%
2427
16th to endDay
15%5%25%5%2445%9%38%
2617
June1st to 15thDay
15%5%25%42445%8%41%
2520
16th to endDay
9%5%25%43446%9%43%
2520
July1st to 15thDay
6%2144246%6%9%51%
2520
16th to endDay
8%313435%5%8%10%45%
2598
August1st to 15thDay
8%5%246%45%5%6%8%41%
2340
16th to endDay
11%5%2442445%8%45%
2406
September1st to 15thDay
12%42442445%7%47%
2160
16th to endDay
14%5%25%424447%44%
1959
October1st to 15thDay
17%7%24313435%44%
1800
16th to endDay
17%9%36%323346%38%
1920
November1st to 15thDay
12%10%46%423446%41%
1593
16th to endDay
14%8%46%5%3446%7%35%
1560
December1st to 15thDay
17%10%6%9%9%5%5%5%45%22%
1450
16th to endDay
19%15%6%10%6%35%33420%
1536
January1st to 15thNight
9%8%5%8%7%47%5%5%6%31%
2506
16th to endNight
11%11%5%10%6%445%5%6%27%
2511
February1st to 15thNight
10%14%5%8%6%34345%34%
2278
16th to endNight
9%8%35%8%2445%6%38%
2014
March1st to 15thNight
13%9%35%423347%41%
2004
16th to endNight
16%10%45%5%34446%34%
2106
April1st to 15thNight
16%9%34424446%38%
1797
16th to endNight
23%10%35%5%23345%34%
1677
May1st to 15thNight
19%5%25%423336%44%
1523
16th to endNight
12%5%35%43336%8%42%
1496
June1st to 15thNight
11%325%5%3436%8%45%
1440
16th to endNight
7%31432435%8%54%
1440
July1st to 15thNight
42123245%6%8%57%
1440
16th to endNight
421232445%8%57%
1569
August1st to 15thNight
6%3145%3445%8%52%
1620
16th to endNight
9%313323346%57%
1795
September1st to 15thNight
10%314412447%56%
1800
16th to endNight
10%5%24423247%51%
1986
October1st to 15thNight
15%5%14422336%49%
2160
16th to endNight
17%8%24424347%41%
2304
November1st to 15thNight
13%8%35%423445%43%
2592
16th to endNight
13%10%46%5%23336%39%
2730
December1st to 15thNight
13%10%5%7%8%35%5%45%29%
2547
16th to endNight
18%14%6%10%5%34345%22%
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
58%6%11%15%8%
1433
16th to endDay
63%413%13%4
1710
February1st to 15thDay
60%412%16%5%
1576
16th to endDay
52%6%12%21%6%
1458
March1st to 15thDay
54%5%14%19%6%
1965
16th to endDay
54%5%13%21%4
2118
April1st to 15thDay
51%410%22%9%1
2151
16th to endDay
57%5%12%16%6%1
2283
May1st to 15thDay
52%6%13%21%6%
2427
16th to endDay
43%7%14%22%10%1
2621
June1st to 15thDay
40%6%14%25%11%
2520
16th to endDay
36%6%16%26%11%1
2520
July1st to 15thDay
29%8%15%31%13%2
2371
16th to endDay
31%8%16%26%15%1
2435
August1st to 15thDay
38%6%14%27%11%1
2326
16th to endDay
36%6%13%27%14%1
2406
September1st to 15thDay
35%6%13%31%13%
2160
16th to endDay
40%5%13%29%10%
1959
October1st to 15thDay
43%411%24%14%1
1800
16th to endDay
47%414%24%8%
1920
November1st to 15thDay
44%5%12%20%15%1
1593
16th to endDay
47%6%18%18%8%
1560
December1st to 15thDay
63%5%13%10%5%
1450
16th to endDay
68%39%14%3
1536
January1st to 15thNight
52%5%13%20%7%
2506
16th to endNight
56%415%16%6%
2511
February1st to 15thNight
52%412%21%8%
2288
16th to endNight
45%5%12%24%11%1
2014
March1st to 15thNight
43%414%25%10%1
2004
16th to endNight
51%6%12%22%6%
2106
April1st to 15thNight
45%5%10%23%13%1
1797
16th to endNight
53%49%17%13%2
1677
May1st to 15thNight
42%5%14%22%12%2
1524
16th to endNight
39%6%13%24%14%1
1498
June1st to 15thNight
36%7%12%29%13%1
1440
16th to endNight
27%5%13%29%20%2
1440
July1st to 15thNight
24%5%14%34%18%2
1360
16th to endNight
24%5%14%33%18%4
1469
August1st to 15thNight
29%6%12%30%19%2
1610
16th to endNight
28%5%15%28%18%3
1795
September1st to 15thNight
28%412%30%23%
1800
16th to endNight
34%411%32%16%
1986
October1st to 15thNight
37%410%29%15%3
2160
16th to endNight
44%413%21%14%
2304
November1st to 15thNight
42%412%21%16%1
2592
16th to endNight
47%5%14%22%9%1
2730
December1st to 15thNight
57%5%12%18%6%
2547
16th to endNight
65%310%14%5%
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%7%36%27%6%2
90
16th to endDay
20%8%37%27%42
96
February1st to 15thDay
14%21%36%25%2
90
16th to endDay
24%8%28%25%12%
81
March1st to 15thDay
24%15%37%22%
90
16th to endDay
36%435%16%6%
102
April1st to 15thDay
23%9%34%23%8%
270
16th to endDay
32%9%26%20%7%2
393
May1st to 15thDay
23%11%33%21%7%2
468
16th to endDay
20%7%29%26%13%2
517
June1st to 15thDay
15%5%27%33%14%4
495
16th to endDay
12%6%33%27%16%3
495
July1st to 15thDay
5%329%32%20%8%
475
16th to endDay
9%324%34%21%5%
515
August1st to 15thDay
10%221%35%26%3
493
16th to endDay
14%226%29%18%7%
446
September1st to 15thDay
12%428%29%19%4
315
16th to endDay
20%6%33%24%7%6%
165
October1st to 15thDay
21%11%29%21%12%2
135
16th to endDay
26%13%34%15%10%
144
November1st to 15thDay
9%10%40%30%8%1
135
16th to endDay
27%15%35%18%2
135
December1st to 15thDay
26%10%37%23%2
94
16th to endDay
32%18%32%15%1
96
January1st to 15thNight
14%10%39%26%7%1
900
16th to endNight
18%10%36%28%5%
960
February1st to 15thNight
17%10%37%27%6%1
880
16th to endNight
13%10%39%26%9%
752
March1st to 15thNight
20%8%36%23%9%
564
16th to endNight
20%8%31%27%10%1
576
April1st to 15thNight
20%10%34%29%5%
539
16th to endNight
28%8%29%24%7%1
540
May1st to 15thNight
21%8%32%29%7%
540
16th to endNight
15%5%32%34%12%
563
June1st to 15thNight
13%329%40%12%
540
16th to endNight
8%229%44%14%
540
July1st to 15thNight
5%128%37%25%1
510
16th to endNight
5%119%48%23%1
564
August1st to 15thNight
7%20%42%25%3
539
16th to endNight
11%121%38%22%3
573
September1st to 15thNight
12%320%39%19%4
540
16th to endNight
13%6%32%29%16%1
576
October1st to 15thNight
18%6%35%24%14%1
720
16th to endNight
22%8%29%30%8%
768
November1st to 15thNight
19%8%37%24%8%
890
16th to endNight
17%13%38%22%7%
975
December1st to 15thNight
20%8%39%25%5%
910
16th to endNight
25%8%31%26%6%
960
Page generated at 2017-12-03 10:16:49. Version ac04

Copyright 2017 A. Danko


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