Preliminary July 2009 Climate Information for NWS Marquette

July 2009 continued the below normal temperature trend that started in May, producing the third consecutive month of below normal temperatures at the National Weather Service office in Negaunee Township. Looking at the 3 month period from May-July, this year ranks as the coldest on record, with an average temperature of 55.1 degrees. This broke the previous record of 55.4 degrees which was set in 1967.  July 2009 finished with an average temperature of 59.8 degrees, which was 5.2 degrees below normal. This places July 2009 as the second coldest July on record, with the coldest July occurring in 1992 (58.3 degrees).

Temperatures tried to rebound after a cold July 1st and 2nd, but struggled to rise to above normal values. This was due to a persistent upper level trough over the Great Lakes, which kept the jet stream, and warmer temperatures, south and west of the area. In fact, there were only three days during July 2009 that were classified as above normal (July 10th, 15th, and 27th). The only day that the temperature rose above 80 degrees was on July 10, when the high reached 83.

Preliminary July 2009 Climate Values and Records
Overall, July 2009 ended up with below normal temperatures and precipitation.

                                                  Value       Departure from Normal
Average Temperature           59.8                          -5.2
Precipitation                            1.93                          -1.08

Here are the preliminary records that occurred in July 2009:

  • On July 8th, a new record low temperature of 40 degrees was set. This broke the old record of 41 degrees, which was set in 1995.
  • A record low high temperature was tied on July 16th, when the temperature peaked at 63 degrees. This tied the previous record of 63, which was set in 1975 and 2004.

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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