A Cold and Wet Start to October 2009

After experiencing the 4th warmest and 6th driest September on record at the National Weather Service (NWS) office in Negaunee Township last month, October 2009 has been the complete opposite. This is largely due to a strong low pressure system that moved through the Great Lakes region at the end of September, which changed the weather to a cooler and more active pattern. This active pattern can be seen in the number of days in which the NWS office in Negaunee Township has not reported precipitation, with only 4 days this month through October 25th. In addition, this month has already seen 4 days of 1.00 inch or more of liquid precipitation. This is only the 3rd time that the NWS Marquette office has reported 4 days with more than an inch of rain during a month, with the other two months being September 1968 and November 1988. Finally, there has never been a month with 5 days of 1.00 inch or more of liquid precipitation.

Precipitation

Through October 25th, this month currently ranks as the 2nd wettest October on record. The 6.59 inches received thus far is 3.54 inches above normal for the October. Here is a list of the wettest Octobers on record:

Rank   Value    Year
   1         7.59     1979
   2         6.59     2009 (through October 25)
   3         6.37     1995
   4         6.32     1969
   5         5.75     1983
   6         5.53     1967
   7         5.27     1990
   8         5.18     2005
   9         5.14     2007
 10         5.09     2002

Temperature

Through October 25th, this month currently ranks as the coldest start to October on record, with an average temperature of 37.9 degrees. This is 6.0 degrees below the normal value of 43.9 degrees. Here is a list of the coldest Octobers on record:

Rank   Value    Year(s)
   1         37.9     2002
   2         38.0     1988
   3         38.5     1976, 1980
   5         39.0     1987
   6         39.5     1979
   7         40.0     2006, 1972
   9         40.1     1981
 10        40.3     1993


Note: the statistics and records for the National Weather Service office in Negaunee Township are based on records which began in October 1961. All climate data listed here are preliminary and unofficial.



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