September 2010 continued the wet weather pattern across Upper Michigan that started in June. This past September will go down as one of the coolest and wettest September's on record. At the National Weather Service (NWS) office in Negaunee Township, September 2010 was the 6th coolest September on record (average temperature of 51.1). In fact, there were only 6 days that had above normal temperatures.
With 6.88" of precipitation, September 2010 will go down as the 4th wettest September on record. September was the third month since June that the NWS office received more than 5 inches of rain. In addition, the June 1st through September 30th period was the third wettest on record, with 20.31" of rain (6.78 inches above normal). This above normal precipitation brought an end to the drought across Upper Michigan. The chart below displays the highs, lows, and precipitation for every day in September.
Additional Monthly Climate Graphs can be found here.
Preliminary September 2010 Climate Values and Records
Overall, September 2010 ended up with below normal temperatures and above normal precipitation.
Value Departure from Normal
Average Temperature 51.1 -3.1
Precipitation (liquid) 6.88 +3.14
Snowfall 0.0 0.0
Here are the preliminary records that occurred in September 2010:
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.