Record Light Winds during September 2009

During September 2009, persistant high pressure kept the winds very light across the Upper Mississippi River Valley.  Both La Crosse, WI and Rochester, MN had their lightest average winds ever recorded in a September.  For more information, look below:

La Crosse, WI...

...Lightest September Wind Average in La Crosse WI...
...Second Lowest Average Monthly Winds in La Crosse WI...

During September 2009...the average wind speed at La Crosse Municipal Airport was just 5.0 mph.  This was the lightest average wind speed for the month of September.  The previous record was 6.6 mph back in 1987 and 2001. Normally...the average monthly wind speed for September is 8.3 mph.

The average winds for September 2009 was the second lowest monthly wind speed ever recorded at La Crosse.  The only month to have a lighter average monthly wind speed was February 1974 when the average wind speed was just 4.8 mph.  Monthly wind records for La Crosse date back to 1948.

The table below contains the ten lightest monthly winds at La Crosse Wisconsin.

      Top Ten Lightest Monthly Winds
              in La Crosse WI
                 1948-2009

                           Average Monthly
   Rank       Month           Wind Speed
   ----       -----        ---------------
     1       Feb 1974           4.8 mph
     2       Sep 2009           5.0 mph
     3       Jan 1974           5.3 mph
             Aug 1954           5.3 mph
     5       Aug 1973           5.4 mph
     6       May 1975           5.5 mph
     7       Aug 2008           5.6 mph
     8       Feb 1978           5.7 mph
             Dec 1974           5.7 mph
    10       Aug 2007           5.8 mph
             Jun 1975           5.8 mph

Rochester, MN...

...Lightest September Wind Average in Rochester MN...
...September 2009 Tied for Fourth Lowest Average Monthly Winds in Rochester MN...


During September 2009...the average wind speed at Rochester International Airport was just 6.5 mph.  This was the lightest average wind speed for the month of September.  The previous record was 7.6 mph back in 1950. Normally...the average monthly wind speed for September is 10.9 mph.

The average winds for September 2009 was tied with August 1953 for the fourth lowest monthly wind speed ever recorded at Rochester.  The lightest average monthly wind speed was 6.1 mph in July 1953.  Monthly wind records for Rochester date back to 1950.

The table below contains the ten lightest monthly winds at Rochester Minnesota.

      Top Ten Lightest Monthly Winds
              in Rochester MN
                 1950-2009

                           Average Monthly
   Rank       Month           Wind Speed
   ----       -----        ---------------
     1       Jul 1953           6.1 mph
     2       Aug 1954           6.2 mph
             Aug 1952           6.2 mph
     4       Sep 2009           6.5 mph
             Aug 1953           6.5 mph
     6       Sep 1952           7.0 mph
             Jul 1956           7.0 mph
     8       Aug 2008           7.2 mph
     9       Feb 1956           7.3 mph
    10       Jul 1998           7.4 mph

 



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