La Crosse
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the La Crosse clear sky chart from 2005-11-06 to 2024-03-23.

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%
25051
16%
80787
9%
24951
41%
24951
20%
55361

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%
940
10%
4391
5%
926
29%
926
10%
3257
January11th to 20thNight
21%
948
11%
4338
4%
930
27%
930
9%
3278
January21st to endNight
20%
1035
6%
4580
2%
1023
25%
1023
8%
3486
February1st to 10thNight
25%
950
13%
2470
5%
950
30%
950
18%
1847
February11th to 20thNight
24%
914
17%
2389
5%
910
32%
910
22%
1685
February21st to endNight
24%
628
16%
1884
5%
628
34%
628
19%
1324
March1st to 10thNight
27%
741
15%
2261
7%
741
34%
741
19%
1565
March11th to 20thNight
31%
570
20%
2090
14%
570
42%
570
18%
1357
March21st to endNight
31%
600
17%
2103
14%
600
39%
600
17%
1448
April1st to 10thNight
23%
540
15%
1800
8%
540
34%
540
18%
1232
April11th to 20thNight
30%
533
18%
1775
12%
533
40%
533
18%
1203
April21st to endNight
31%
540
15%
1761
9%
540
40%
540
19%
1214
May1st to 10thNight
32%
540
16%
1452
9%
540
38%
540
23%
1035
May11th to 20thNight
40%
531
18%
1417
10%
531
46%
531
27%
957
May21st to endNight
46%
584
15%
1551
7%
582
51%
582
31%
1010
June1st to 10thNight
49%
540
16%
1440
7%
540
53%
540
34%
908
June11th to 20thNight
44%
540
18%
1440
9%
540
48%
540
32%
925
June21st to endNight
55%
540
19%
1440
9%
540
59%
540
38%
873
July1st to 10thNight
66%
525
18%
1400
10%
525
68%
525
44%
792
July11th to 20thNight
61%
522
22%
1392
12%
522
64%
522
42%
808
July21st to endNight
70%
591
23%
1487
16%
558
71%
558
45%
856
August1st to 10thNight
69%
537
23%
1544
19%
534
73%
534
38%
896
August11th to 20thNight
64%
534
22%
1622
22%
534
68%
534
35%
934
August21st to endNight
59%
594
23%
1980
24%
594
64%
594
33%
1109
September1st to 10thNight
54%
540
22%
1800
22%
540
59%
540
30%
1043
September11th to 20thNight
51%
540
28%
1800
23%
540
60%
540
33%
1004
September21st to endNight
44%
687
23%
2023
14%
687
53%
687
32%
1205
October1st to 10thNight
40%
720
22%
2160
14%
720
47%
720
29%
1312
October11th to 20thNight
30%
720
19%
2160
10%
720
39%
720
22%
1444
October21st to endNight
31%
792
16%
2470
9%
792
38%
792
19%
1710
November1st to 10thNight
29%
740
22%
2406
13%
740
41%
740
22%
1527
November11th to 20thNight
21%
907
14%
2617
5%
907
29%
907
16%
1939
November21st to endNight
24%
950
16%
2660
7%
950
33%
950
19%
1893
December1st to 10thNight
21%
950
10%
2660
4%
950
28%
950
16%
2001
December11th to 20thNight
19%
950
11%
3210
3%
948
25%
948
11%
2447
December21st to endNight
16%
1038
7%
4814
4%
1026
22%
1026
6%
3837

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
14%9%47%6%35%5%5%7%36%
78651
Night
13%10%48%6%3445%6%37%
81291
TransparencyDay
47%6%13%22%11%1
78351
Night
48%5%12%22%12%1
81111
SeeingDay
18%12%31%24%12%4
14984
Night
18%10%30%30%11%1
25080

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%14%11%15%8%45%45%422%
2527
11th to 20thDay
9%12%5%12%10%47%11%6%6%18%
2530
21st to endDay
16%18%9%11%6%3335%5%21%
3043
February1st to 10thDay
8%13%5%10%7%45%5%5%7%31%
1710
11th to 20thDay
12%10%5%7%7%45%5%5%6%34%
1678
21st to endDay
13%11%39%8%35%45%7%33%
1570
March1st to 10thDay
14%11%5%6%6%3444437%
1933
11th to 20thDay
12%10%47%5%35%45%6%39%
2090
21st to endDay
19%11%46%6%45%45%5%31%
2296
April1st to 10thDay
17%12%46%6%44446%32%
2160
11th to 20thDay
19%12%46%5%3445%6%33%
2134
21st to endDay
21%10%36%6%35%46%6%31%
2196
May1st to 10thDay
17%9%37%6%45%5%6%8%30%
2506
11th to 20thDay
17%7%37%6%46%46%7%34%
2479
21st to endDay
16%6%36%5%35%5%6%7%37%
2725
June1st to 10thDay
12%5%245%345%6%9%45%
2520
11th to 20thDay
12%6%25%5%35%5%6%9%42%
2520
21st to endDay
13%5%35%6%46%5%6%10%39%
2520
July1st to 10thDay
8%4245%36%6%6%8%48%
2520
11th to 20thDay
8%4245%35%5%7%8%48%
2520
21st to endDay
8%425%435%6%7%9%47%
2743
August1st to 10thDay
7%5%25%6%46%7%7%10%42%
2382
11th to 20thDay
13%5%35%5%345%6%8%43%
2279
21st to endDay
10%5%245%25%46%8%47%
2376
September1st to 10thDay
16%5%25%4245%5%7%45%
2160
11th to 20thDay
11%6%25%5%4445%7%47%
2160
21st to endDay
14%8%35%5%3445%8%42%
1914
October1st to 10thDay
16%8%25%5%2445%5%43%
1800
11th to 20thDay
19%10%35%42345%8%36%
1800
21st to endDay
18%11%47%6%33345%37%
1885
November1st to 10thDay
13%9%37%5%3446%6%41%
1672
11th to 20thDay
15%13%5%9%7%34446%30%
1562
21st to endDay
13%10%5%7%6%24446%40%
1520
December1st to 10thDay
13%13%6%10%7%3445%6%29%
1520
11th to 20thDay
13%13%6%8%7%36%5%6%6%26%
1918
21st to endDay
19%19%9%14%6%3433417%
2783
January1st to 10thNight
10%14%9%12%7%45%445%26%
4428
11th to 20thNight
10%13%7%13%8%45%8%7%421%
4440
21st to endNight
14%19%8%10%6%34445%23%
4623
February1st to 10thNight
8%14%6%9%8%46%445%32%
2470
11th to 20thNight
10%9%47%7%5%5%45%6%39%
2388
21st to endNight
13%11%5%8%7%3445%5%35%
1884
March1st to 10thNight
14%11%47%6%345%5%5%37%
2261
11th to 20thNight
13%9%47%5%345%5%6%39%
2090
21st to endNight
17%12%37%6%3346%6%34%
2103
April1st to 10thNight
18%10%47%5%3445%5%37%
1800
11th to 20thNight
20%10%36%4245%46%36%
1775
21st to endNight
19%9%36%6%2445%6%34%
1761
May1st to 10thNight
19%8%26%435%5%5%8%35%
1452
11th to 20thNight
16%7%35%4345%5%8%41%
1416
21st to endNight
13%5%25%435%46%8%45%
1551
June1st to 10thNight
11%425%4345%6%8%47%
1440
11th to 20thNight
10%7%36%5%3345%10%45%
1440
21st to endNight
9%425%5%3445%9%52%
1440
July1st to 10thNight
6%5%233245%48%57%
1440
11th to 20thNight
8%32442445%10%55%
1440
21st to endNight
5%413435%5%5%9%55%
1575
August1st to 10thNight
7%2245%45%6%6%9%51%
1553
11th to 20thNight
11%425%32335%7%53%
1622
21st to endNight
9%6%2442445%6%54%
1980
September1st to 10thNight
11%6%25%33445%7%50%
1800
11th to 20thNight
13%42432335%7%54%
1800
21st to endNight
12%5%25%42345%5%53%
2023
October1st to 10thNight
14%6%24333446%50%
2160
11th to 20thNight
17%8%36%5%3435%7%40%
2160
21st to endNight
18%10%46%5%34446%37%
2470
November1st to 10thNight
14%8%46%43445%5%43%
2406
11th to 20thNight
13%12%6%9%8%4445%432%
2617
21st to endNight
15%13%48%5%33346%37%
2660
December1st to 10thNight
12%12%6%10%7%45%45%7%28%
2660
11th to 20thNight
13%14%6%12%6%44446%27%
3279
21st to endNight
19%17%8%12%7%3443420%
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
65%5%12%12%5%
2528
11th to 20thDay
61%6%10%17%6%
2530
21st to endDay
66%413%13%4
3043
February1st to 10thDay
52%5%14%17%10%1
1710
11th to 20thDay
51%5%12%24%8%1
1687
21st to endDay
52%5%10%21%10%2
1570
March1st to 10thDay
50%5%13%21%11%1
1933
11th to 20thDay
45%414%22%12%1
2090
21st to endDay
55%5%10%21%8%1
2296
April1st to 10thDay
54%411%20%10%1
2160
11th to 20thDay
53%5%9%20%11%2
2134
21st to endDay
53%6%12%17%11%1
2196
May1st to 10thDay
51%7%13%21%8%1
2506
11th to 20thDay
49%7%12%20%11%1
2483
21st to endDay
45%7%10%22%14%2
2725
June1st to 10thDay
35%7%14%29%14%2
2520
11th to 20thDay
38%8%14%24%15%1
2520
21st to endDay
41%8%14%24%12%2
2520
July1st to 10thDay
32%9%15%30%13%2
2451
11th to 20thDay
32%8%14%26%18%2
2445
21st to endDay
31%7%16%30%14%2
2591
August1st to 10thDay
34%9%16%30%11%2
2367
11th to 20thDay
38%7%13%28%13%1
2279
21st to endDay
35%6%13%27%17%2
2376
September1st to 10thDay
38%6%14%25%17%1
2160
11th to 20thDay
36%7%14%31%11%1
2160
21st to endDay
41%6%11%29%12%1
1914
October1st to 10thDay
42%6%10%30%12%
1800
11th to 20thDay
46%5%13%23%12%1
1800
21st to endDay
51%5%12%20%11%1
1885
November1st to 10thDay
43%6%14%21%15%2
1672
11th to 20thDay
56%5%12%18%8%1
1562
21st to endDay
47%5%17%22%8%1
1520
December1st to 10thDay
56%6%14%16%7%1
1520
11th to 20thDay
57%6%16%15%6%1
1915
21st to endDay
73%5%7%12%3
2783
January1st to 10thNight
60%5%11%19%5%
4428
11th to 20thNight
62%5%11%15%7%
4440
21st to endNight
64%411%16%5%
4623
February1st to 10thNight
55%311%19%10%1
2470
11th to 20thNight
47%5%12%24%10%1
2389
21st to endNight
51%411%21%11%1
1884
March1st to 10thNight
48%6%13%22%9%1
2261
11th to 20thNight
46%6%11%23%13%2
2090
21st to endNight
51%5%10%22%10%2
2103
April1st to 10thNight
49%5%9%20%15%2
1800
11th to 20thNight
49%5%9%18%16%3
1775
21st to endNight
49%5%11%19%13%2
1761
May1st to 10thNight
47%6%12%21%13%1
1452
11th to 20thNight
42%6%12%23%15%1
1417
21st to endNight
38%7%12%25%17%2
1552
June1st to 10thNight
33%7%14%27%17%1
1440
11th to 20thNight
37%6%10%25%20%2
1440
21st to endNight
30%7%16%28%15%4
1440
July1st to 10thNight
25%6%14%34%18%3
1400
11th to 20thNight
27%6%15%30%20%2
1392
21st to endNight
24%7%17%30%18%4
1487
August1st to 10thNight
28%8%14%31%17%3
1544
11th to 20thNight
30%7%14%29%18%2
1622
21st to endNight
30%7%13%28%17%4
1980
September1st to 10thNight
34%6%10%27%22%1
1800
11th to 20thNight
31%5%13%33%16%1
1800
21st to endNight
33%6%11%31%18%1
2023
October1st to 10thNight
36%5%9%31%17%2
2160
11th to 20thNight
44%6%12%21%16%1
2160
21st to endNight
49%5%10%23%12%1
2470
November1st to 10thNight
44%412%23%15%2
2406
11th to 20thNight
56%412%17%9%1
2617
21st to endNight
51%414%24%7%1
2660
December1st to 10thNight
56%5%13%19%6%
2660
11th to 20thNight
59%6%11%18%6%
3281
21st to endNight
68%5%10%13%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
20%17%31%21%9%3
270
11th to 20thDay
21%21%36%17%31
270
21st to endDay
22%18%37%19%4
297
February1st to 10thDay
15%23%42%15%32
270
11th to 20thDay
20%24%34%18%4
270
21st to endDay
19%19%44%17%1
225
March1st to 10thDay
21%19%39%14%6%1
270
11th to 20thDay
23%15%39%15%6%2
270
21st to endDay
30%13%29%17%9%1
366
April1st to 10thDay
27%15%36%16%6%
420
11th to 20thDay
29%15%29%17%9%1
412
21st to endDay
25%16%31%19%8%2
456
May1st to 10thDay
24%15%30%23%6%2
603
11th to 20thDay
20%15%31%20%11%3
625
21st to endDay
21%10%26%24%15%4
679
June1st to 10thDay
12%6%28%32%17%4
630
11th to 20thDay
14%8%34%29%12%3
630
21st to endDay
13%9%31%27%14%5%
630
July1st to 10thDay
9%420%31%25%10%
621
11th to 20thDay
9%6%28%31%19%6%
618
21st to endDay
8%428%34%19%7%
684
August1st to 10thDay
7%423%34%23%9%
626
11th to 20thDay
15%420%27%24%8%
593
21st to endDay
12%6%26%27%22%7%
495
September1st to 10thDay
18%7%23%32%14%6%
450
11th to 20thDay
11%7%30%30%16%5%
450
21st to endDay
19%16%28%22%13%2
370
October1st to 10thDay
20%12%28%27%10%3
270
11th to 20thDay
27%18%31%16%7%
270
21st to endDay
29%16%34%13%6%1
297
November1st to 10thDay
19%14%38%23%6%1
270
11th to 20thDay
22%19%38%17%31
270
21st to endDay
22%18%39%16%6%
270
December1st to 10thDay
16%15%42%18%8%
270
11th to 20thDay
22%18%33%20%6%1
270
21st to endDay
29%12%42%14%2
297
January1st to 10thNight
16%15%37%25%8%1
950
11th to 20thNight
19%14%35%27%5%1
950
21st to endNight
20%12%34%27%6%1
1045
February1st to 10thNight
15%14%35%29%6%1
950
11th to 20thNight
16%15%37%25%7%1
914
21st to endNight
21%13%36%25%6%
628
March1st to 10thNight
20%12%35%27%6%1
741
11th to 20thNight
19%12%31%30%7%1
570
21st to endNight
24%10%27%28%10%1
600
April1st to 10thNight
22%12%38%22%5%
540
11th to 20thNight
26%10%30%26%8%
533
21st to endNight
24%9%30%28%8%1
540
May1st to 10thNight
23%8%32%30%6%1
540
11th to 20thNight
18%8%30%34%9%1
531
21st to endNight
16%5%27%36%15%1
584
June1st to 10thNight
13%5%27%41%14%
540
11th to 20thNight
14%7%30%38%11%1
540
21st to endNight
10%326%43%17%1
540
July1st to 10thNight
8%119%38%31%3
525
11th to 20thNight
8%5%21%41%23%2
522
21st to endNight
5%217%49%24%3
591
August1st to 10thNight
6%116%46%28%2
537
11th to 20thNight
13%315%37%29%4
534
21st to endNight
11%321%39%23%2
594
September1st to 10thNight
14%421%39%16%5%
540
11th to 20thNight
13%5%27%31%20%4
540
21st to endNight
16%9%27%33%13%2
687
October1st to 10thNight
18%9%28%27%16%1
720
11th to 20thNight
22%13%30%28%8%
720
21st to endNight
23%12%28%30%7%1
792
November1st to 10thNight
19%12%35%26%8%1
740
11th to 20thNight
18%18%36%22%6%
907
21st to endNight
22%16%31%25%7%
950
December1st to 10thNight
19%13%37%24%6%1
950
11th to 20thNight
21%14%35%23%6%
950
21st to endNight
27%13%32%23%5%
1045
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