String Of Non Sub-Zero Temperatures At Rochester Ends

The temperature at the Rochester International Airport had not fallen below zero since January 21, 2012 (-12 degrees).  Temperatures fell to -2 on December 30th, ending the string of non sub-zero days in Rochester at 343 days.  This stretch breaks the January 27, 1987 through December 25, 1987 period for the longest stretch of days without a sub-zero temperature. 

                Number of Consecutive Days
                 Minimum Temperature >= 0
                   for Rochester MN

                 Run
       Rank    Length             Dates
       ----    ------             -----  
         1      343     2012-01-22 through 2012-12-29
         2      333     1987-01-27 through 1987-12-25
         3      329     2006-02-20 through 2007-01-14
         4      328     1999-01-26 through 1999-12-19
         5      320     1992-01-20 through 1992-12-04
         6      312     2005-01-24 through 2005-12-01
         7      310     1913-03-08 through 1914-01-11
         8      307     2004-02-16 through 2004-12-18
         9      305     1981-02-13 through 1981-12-14
        10      304     1946-02-16 through 1946-12-16

         Period of record: 1886-07-01 to 2012-12-29

This stretch was so long due to January 21st (the last time the temperature fell below zero at Rochester) being the second earliest date for the last sub-zero temperature in a winter.  Prior to last winter, the earliest date was January 19th during the 1991-92 winter. The normal date for the last sub-zero temperature is March 2nd.

The normal first date for the first sub-zero temperature in a winter is December 6th. This winter is a long ways from the latest first sub-zero temperature in a winter. This occurred during the 1908-09 winter when the first sub-zero temperature occurred on February 15th (-7 degrees).

Normally, Rochester has 30 sub-zero days in a winter. The least number of sub-zero temperatures in a winter is 6 during the winter of 2001-02.  Last winter was the second least with 8 sub-zero days.  Meanwhile, the greatest number of sub-zero days is 60 days (winter of 1977-78).



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