National Weather Service United States Department of Commerce
August 2019 Climate Summary
and September Climate Outlook

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For a larger view of the Duluth, Minnesota temperature graph provided by the Midwestern Regional Climate Center: Click Here

 

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For a larger view of the International Falls, Minnesota temperature graph provided by the Midwestern Regional Climate Center: Click Here

 

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For a larger view of the Brainerd, Minnesota temperature graph provided by the Midwestern Regional Climate Center: Click Here

 

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For a larger view of the Hibbing, Minnesota temperature graph provided by the Midwestern Regional Climate Center: Click Here

 

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For a larger view of the Ashland, Wisconsin temperature graph provided by the Midwestern Regional Climate Center: Click Here

 

September Climate Outlook

Temperature Outlook Precipitation Outlook

For Duluth, normal highs begin in the low 70s and cool to the upper 50s by the end of the month. Normal lows begin in the low 50s and cool to the low 40s by the end of the month. Normal precipitation for September is 4.11 inches. Normal snowfall for September is 0.1 inches. 

For International Falls, normal highs begin in the low 70s and cool to the upper 50s by the end of the month. Normal lows begin in the upper 40s and cool to the mid 30s by the end of the month. Normal precipitation for September is 2.99 inches. Normal snowfall for September is 0.1 inches.

For Brainerd, normal highs begin in the mid 70s and cool to the low to mid 60s by the end of the month. Normal lows begin in the lower 50s and cool to the lower 40s by the end of the month. Normal precipitation for September is 3.18 inches. 

For Hibbing, normal highs begin in the lower 70s and cool to the upper 50s by the end of the month. Normal lows begin in the mid 40s and cool to the mid 30s by the end of the month. Normal precipitation for September is 3.07 inches. 

For Ashland, normal highs begin in the mid 70s and cool to the low 60s by the end of the month. Normal lows begin in the upper 40s and cool to the lower 40s by the end of the month. Normal precipitation for September is 3.85 inches.

The latest Climate Prediction Center (CPC) outlook for September indicates that odds are tilted toward below normal temperatures and above normal precipitation.

 

Duluth, MN

Normals for the Month of September
(The monthly climate normals are from a 30 year period defined by the Climate Prediction Center as 1981-2010)

  The Normal, Monthly Average Temperature (degrees F)

55.6

  The Normal, Monthly High Temperature (degrees F)

65.0

  The Normal, Monthly Low Temperature (degrees F)

46.1

 

 

  Normal Monthly Precipitation (inches)

4.11

  Normal Monthly Snowfall (inches)

0.1

 

 

  Normal number of days with Measurable Precipitation

12.3

  Normal number of days with snow depth of 1 inch or greater

0.0

 

 

  Normal Heating Degree Days

298

  Normal Cooling Degree Days

14

 

Records for the Month of September

  Warmest Month (Monthly Average Temperature)

62.6 in 1897

  Coldest  Month (Monthly Average Temperature)

47.8 in 1974

  Highest Observed Temperature (degrees F)

95 on the 7th in 1976

  Lowest Observed High Temperature (degrees F)

38 on the 30th in 1985

  Lowest Observed Temperature (degrees F)

23 on the 20th in 1962, on the 26th 1965 & on the 22nd 1974

  Highest Observed Low Temperature (degrees F)

72 on the 11th in 1931

 

 

  Greatest Monthly Precipitation (inches)

11.52 in 1881

  Least Monthly  Precipitation (inches)

0.19 in 1952

  Greatest Daily Precipitation (inches)

3.97 on the 6th in 1876

 

 

  Greatest Monthly Snowfall (inches)

2.4 in 1991

  Least Monthly Snowfall (inches)

0.0

  Greatest Daily Snowfall (inches)

2.4 on the 18th 1991

International Falls, MN

Normals for the Month of September
(The monthly climate normals are from a 30 year period defined by the Climate Prediction Center as 1981-2010)

  The Normal, Monthly Average Temperature (degrees F)

53.6

  The Normal, Monthly High Temperature (degrees F)

65.4

  The Normal, Monthly Low Temperature (degrees F)

41.8

 

 

  Normal Monthly Precipitation (inches)

2.99

  Normal Monthly Snowfall (inches)

0.10

 

 

  Normal number of days with Measurable Precipitation

11.9

  Normal number of days with snow depth of 1 inch or greater

0.0

 

 

  Normal Heating Degree Days

353

  Normal Cooling Degree Days

11

 

Records for the Month of September

  Warmest Month (Monthly Average Temperature)

62.7 in 1920

  Coldest  Month (Monthly Average Temperature)

46.4 in 1965

  Highest Observed Temperature (degrees F)

96 on the 7th in 1906

  Lowest Observed High Temperature (degrees F)

35 on the 25th & 26th in 1926

  Lowest Observed Temperature (degrees F)

19 on the 15th in 2011

  Highest Observed Low Temperature (degrees F)

73 on the 8th in 2002

 

 

  Greatest Monthly Precipitation (inches)

7.36 in 1961

  Least Monthly  Precipitation (inches)

0.20 in 1897

  Greatest Daily Precipitation (inches)

3.34 on the 1st in 1973

 

 

  Greatest Monthly Snowfall (inches)

2.0 in 1912

  Least Monthly Snowfall (inches)

0 in Multiple Years

  Greatest Daily Snowfall (inches)

2.0 on the 26th in 1912

  Greatest Measured Snow Depth (inches)

0.0

Brainerd, MN

Normals for the Month of September
(The monthly climate normals are from a 30 year period defined by the Climate Prediction Center as 1981-2010)

  The Normal, Monthly Average Temperature (degrees F)

58.1

  The Normal, Monthly High Temperature (degrees F)

69.1

  The Normal, Monthly Low Temperature (degrees F)

47.2

 

 

  Normal Monthly Precipitation (inches)

3.18

 

 

  Normal Heating Degree Days

235

  Normal Cooling Degree Days

30

 

Records for the Month of September

  Warmest Month (Monthly Average Temperature)

63.6 in 1931 and 2009

  Coldest  Month (Monthly Average Temperature)

49.2 in 1918

  Highest Observed Temperature (degrees F)

103 on the 10th in 1931

  Lowest Observed High Temperature (degrees F)

36 on the 29th in 1899

  Lowest Observed Temperature (degrees F)

18 on the 22nd in 1974

 Highest Observed Low Temperature (degrees F)

71 in multiple years

 

 

  Greatest Monthly Precipitation (inches)

8.04 in 1986

  Least Monthly  Precipitation (inches)

0.26 in 1952

  Greatest Daily Precipitation (inches)

3.62 on the 5th in 2004

Hibbing, MN

Normals for the Month of September
(The monthly climate normals are from a 30 year period defined by the Climate Prediction Center as 1981-2010)

  The Normal, Monthly Average Temperature (degrees F)

53.1

  The Normal, Monthly High Temperature (degrees F)

65.9

  The Normal, Monthly Low Temperature (degrees F)

40.2

 

 

  Normal Monthly Precipitation (inches)

3.07

 

 

  Normal Heating Degree Days

367

  Normal Cooling Degree Days

9

 

Records for the Month of September

  Warmest Month (Monthly Average Temperature)

60.6 in 1948

  Coldest  Month (Monthly Average Temperature)

46.1 in 1965

  Highest Observed Temperature (degrees F)

94 on the 7th in 1976

  Lowest Observed High Temperature (degrees F)

34 on the 24th in 1942

  Lowest Observed Temperature (degrees F)

20 in multiple years

 Highest Observed Low Temperature (degrees F)

68 in multiple years

 

 

  Greatest Monthly Precipitation (inches)

8.67 in 1947

  Least Monthly  Precipitation (inches)

0.50 in 1952

  Greatest Daily Precipitation (inches)

5.51 on the 10th in 1947

Ashland, WI

Normals for the Month of September
(The monthly climate normals are from a 30 year period defined by the Climate Prediction Center as 1981-2010)

  The Normal, Monthly Average Temperature (degrees F)

56.7

  The Normal, Monthly High Temperature (degrees F)

68.4

  The Normal, Monthly Low Temperature (degrees F)

45.0

 

 

  Normal Monthly Precipitation (inches)

3.85

 

 

  Normal Heating Degree Days

270

  Normal Cooling Degree Days

21

 

Records for the Month of September

  Warmest Month (Monthly Average Temperature)

61.8 in 2015

  Coldest  Month (Monthly Average Temperature)

50.0 in 1918

  Highest Observed Temperature (degrees F)

100 on the 7th in 1976

  Lowest Observed High Temperature (degrees F)

43 on the 23rd in 1913 and on the  19th in 1918

  Lowest Observed Temperature (degrees F)

12 on the 28th in 1893

 Highest Observed Low Temperature (degrees F)

75 on the 8th in 1906

 

 

  Greatest Monthly Precipitation (inches)

10.00 in 1985

  Least Monthly  Precipitation (inches)

0.09 in 1952

  Greatest Daily Precipitation (inches)

4.70 on the 3rd in 1985