Just How Wet Was the Summer of 2010

Through much of the 2010 meteorological summer (June 1st through August 31st), northeast Iowa, southeast Minnesota, and western Wisconsin remained on the periphery of a subtropical high located across the the southern United States.  While residents underneath this high saw record heat, a progressive train of systems rotating around this high have brought frequent rounds of precipitation across the Northern Plains, Upper Mississippi River Valley, and Great Lakes. With the exception of northeast Wisconsin and western Upper Michigan, the rain has alleviated much of the drought across the region.  During the summer of 2010, area rainfall values have generally ranged between 15 and 27 inches.  Normally only 13 inches falls during an entire meteorological summer. 

The following locations established new precipitation during the summer of 2010...

  • Alma Dam 4, Wisconsin  24.47 inches - previous record 23.72 inches in 1998
  • Hillsboro, Wisconsin  22.90 inches - previous record 22.38 inches in 1980
  • La Crosse, Wisconsin 20.93 inches - previous record 20.32 inches in 2007
  • Lone Rock, Wisconsin  22.69 inches - previous record 21.93 inches in 2007
  • Necedah 2SE, Wisconsin  21.80 inches - previous record 20.99 inches in 1980
  • Ontario, Wisconsin  24.59 inches - previous record 22.68 inches in 2007
  • Wabasha, Minnesota  24.21 inches - previous record 22.21 inches in 1993
  • Winona Dam 5A, Minnesota  20.21 inches - previous record 20.19 inches in 1998

The tables below compare the 2010 summer rainfall totals (June 1st through August 31st) to other wet summers.

Northeast Iowa...

                2010 Summer
                  Rainfall       Wettest
                   Total         Summer
  Location      Jun 1-Aug 31      Rank       Wettest Summer
  --------      ------------    -------      --------------
Fayette          22.81 inches     3rd     24.82 inches in 1993
Dorchester       20.97 inches     7th     24.23 inches in 2007
Waukon           20.85 inches     5th     27.79 inches in 2009
Guttenberg       20.60 inches     3rd     22.47 inches in 1940
New Hampton      20.28 inches     7th     31.39 inches in 1993
Decorah          19.08 inches    11th     29.23 inches in 1993
Postville        18.87 inches     8th     27.11 inches in 2007
Osage            18.30 inches    11th     27.15 inches in 1980
Waucoma 3SE      18.04 inches     8th     28.20 inches in 1993
Cresco           17.07 inches    19th     28.45 inches in 1993
Charles City     16.24 inches    22nd     29.87 inches in 1999

Southeast Minnesota...

                2010 Summer
                  Rainfall       Wettest
                   Total         Summer
  Location      Jun 1-Aug 31      Rank       Wettest Summer
  --------      ------------    -------      --------------
Wabasha          24.59 inches     1st     Previous Record -
                                          22.21 inches in 1993
Caledonia        21.94 inches     7th     27.46 inches in 2007
La Crescent      21.89 inches     2nd     23.79 inches in 2007
Winona Dam 5A    20.21 inches     1st     Previous - Record
                                          20.19 inches in 1998
Lanesboro        19.98 inches     5th     27.69 inches in 2007
Theilman         19.92 inches     4th     21.20 inches in 1993
Lake City        18.10 inches     4th     25.53 inches in 2002
Preston          17.41 inches    12th     23.64 inches in 1990
Minnesota City   16.94 inches    11th     21.30 inches in 1998
Rochester        16.49 inches    15th     23.34 inches in 2000
Elgin 2 SSW      16.13 inches    14th     22.91 inches in 1998
Austin           15.92 inches    11th     26.05 inches in 1990
Grand Meadow     15.60 inches    28th     23.32 inches in 1999

Western Wisconsin...

                2010 Summer
                  Rainfall       Wettest
                   Total         Summer
  Location      Jun 1-Aug 31      Rank       Wettest Summer
  --------      ------------    -------      --------------
Genoa Dam 8      26.67 inches     2nd     27.03 inches in 2007
Platteville      24.64 inches     2nd     26.44 inches in 1993
Ontario          25.80 inches     1st     Previous Record -
                                          22.68 inches in 2007
Westby 3ENE      25.33 inches     2nd     26.62 inches in 2007
Alma Dam 4       24.47 inches     1st     Previous Record -
                                          23.72 inches in 1998
Viroqua          23.97 inches     3rd     30.01 inches in 2007
Hillsboro        22.90 inches     1st     Previous Record -
                                          22.38 inches in 1980
Lone Rock        22.69 inches     1st     Previous Record -
                                          21.93 inches in 2007
Richland Center  22.31 inches     4th     29.35 inches in 2007
Lancaster        22.00 inches     2nd     26.42 inches in 1993
Necedah 2SE      21.80 inches     1st     Previous Record -
                                          20.99 inches in 1980
La Crosse        20.93 inches     1st     Previous Record -
                                          20.32 inches in 2007
Gays Mills       20.27 inches     3rd     30.27 inches in 2007
Boscobel         19.66 inches     2nd     24.33 inches in 2007
Owen 3W          18.64 inches     5th     23.40 inches in 1980
Sparta           18.17 inches     5th     19.42 inches in 1998
Medford          17.68 inches    13th     28.30 inches in 1905
Neillsville 3SW  17.61 inches     8th     21.53 inches in 1980
Trempealeau Dam  17.17 inches     8th     22.26 inches in 1978
Lynxville Dam 9  16.92 inches     9th     22.45 inches in 1951
Prairie du Chien 16.14 inches    21st     27.91 inches in 2007 



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