By JIM ANDERSON
IRON MOUNTAIN - An 11-month string of above-normal temperatures came to an end in September as the average temperature at Iron Mountain-Kingsford was 1.6 degrees below normal.
Theresa Peterson/Daily News Photo
Carol Curtis blows leaves of her lawn on Margaret Street in Iron Mountain. September was 1.6 degrees below normal in Iron Mountain-Kingsford.
September 2012 was the first month since September 2011 to feature a below-normal mean monthly temperature, said Kevin Crupi, weather service meteorologist at Marquette. "Despite this chill, the period from October 2011 through September 2012 is the warmest October through September on record," he added.
The 12-month period was also the driest on record.
From October 2011 through September 2012, the average temperature at Iron Mountain-Kingsford was 46.5 degrees, which was 4.2 degrees above normal. It was 0.5 degrees above the previous October through September record set in 1997-98.
Water-equivalent precipitation from October 2011 through September 2012 totaled 21.08 inches, which was 8.64 inches below normal and 0.06 inches drier than the previous record set in 1962-63.
The average temperature in September was 56 degrees, which compares to a normal of 57.6 degrees. Precipitation totaled 1.97 inches, was 1.65 inches below normal.
The highest temperature was 84 degrees on Sept. 3 and the lowest was 30 degrees on Sept. 27. No new daily or monthly records were established.
Statistics for the Iron Mountain-Kingsford Wastewater Treatment Plant cooperative observer site are based on records that began in March 1931. Any data listed from years before 1931 were taken at nearby sites. Normals used are for the period 1981 through 2010.
The weather service predicts normal temperature trends for November through January. However there is a greater than climatological chance of below-normal three-month precipitation over the west half of the Upper Peninsula.
Jim Anderson's email address is email@example.com.