Preliminary May 2010 Climate Information for NWS Marquette

May 2010 continued the warm and dry weather across Upper Michigan that started in March. This past May will go down as one of the warmest and driest May's on record.  At the National Weather Service (NWS) office in Negaunee Township, May 2010 was tied with 1991 as the 2nd warmest May on record (average temperature of 55.7). There were 4 days during the month of May that had a temperature of 85 degrees or more.  That equals the total number of 85 degree or warmer days for all of 2009. 

With only 1.46" of precipitation, May 2010 will go down as the 6th driest May on record.  Even with the warm and dry conditions, May 2010 was the 3rd snowiest, due to the 7.6" of snow that was received at the NWS in Negaunee Township on May 7-8.  In fact, almost 70% of the precipitation for May 2010 came from that snowstorm.  The chart below displays the highs, lows, and precipitation for every day in March.

May 2010 Climate Chart

Additional Monthly Climate Graphs can be found here.

Finally, the period from March 1st through May 31st will go down as the warmest and driest on record at the NWS in Negaunee Township.  The average temperature during that time period was 45.1 degrees, which was 1.4 degrees warmer than the previous record high. Only 3.37 inches of precipitation fell during that time frame, which was 5.62" below normal and only 37% of what is normally received.

Preliminary May 2010 Climate Values and Records

Overall, May 2010 ended up with above normal temperatures and below normal precipitation. 

                                             Value             Departure from Normal
Average Temperature       55.7                           +4.7
Precipitation  (liquid)         1.46                           -1.61
Snowfall                               7.6                             +6.1

Here are the preliminary records that occurred in May 2010:

  • On May 7th and 8th, new snowfall records were set.  On May 7th, 2.4" of snow fell, which broke the previous record of 1.2" in 1980.  Then on May 8th, 5.2" of snow fell and broke the previous record of 1.8" set in 1962.
  • A daily rainfall record was set on May 8th, when 0.67 inches of rain fell. This broke the previous record of 0.54 inches, which was set in 1964.
  • Record High Temperatures were set during a 3 day period from May 23-25.  On the 23rd, the new record of 88 broke the previous record of 86, which was set in 1980, 1975, 1972.  91 degrees was reached on May 24th, breaking the previous record of 83 degrees in 2007.  Finally, the high on May 25th was 88 degrees, which broke the previous record high of 87 degrees from 1972 and 1965.

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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