September 2020 was cooler and drier than average across the Northland. Average temperatures for the month were 1 to nearly 3 degrees below normal, while precipitation totals for the month were 1 to 3 inches below normal.

September 2020 Climate Summary for Duluth, Minnesota

Average temperature: 54.6 degrees
Normal: 55.6 degrees
Departure: -1.0 degree below normal

Highest temperature: 81 F on the 23rd and 22nd
Lowest temperature: 28 F on the 18th

9 days had a high temperature of at least 70 degrees, normal is 9 days

2 days had a high temperature of at least 80 degrees, normal is 2 days

1 day had a low temperature of 32 degrees or colder, normal is 1 day

Total precipitation: 0.85″
Normal: 4.11″
Departure: -3.26″ below normal

Greatest calendar day precipitation total: 0.27″ on the 1st

10 days had at least 0.01″ of precipitation
3 days had at least 0.10″ of precipitation

Total snowfall: 0.0″
Normal: 0.1″
Departure: -0.1″ below normal

5 days with thunder

Note: September 2020 was the 7th driest September in station history.

Accumulated Precipitation graph for Duluth, Minnesota for September 2020.

Blue line=Wettest September on record

Red line=Driest September on record

Brown line=Normal

Green line=2020 accumulation

Source: https://w2.weather.gov/

Only 1 quarter inch or greater precipitation event in Duluth in all of September 2020, and that came on the 1st, over 4 weeks ago!

Source: https://mesonet.agron.iastate.edu/

15/30 or 50% of days in September had a below average temperature (blue)

13/30 or 43% of days in September had an above average temperature (red)

2/30 or 7% of days in September had a normal temperature

September 2020 Daily Average Temperature Departure for Duluth, Minnesota.

September 2020 Climate Summary for International Falls, Minnesota

Average temperature: 52.6 degrees
Departure: -1.0 degree below normal

Total precipitation: 1.81″
Departure: -1.18″ below normal

4 days with thunder
September 2020 Climate Summary for Brainerd, Minnesota

Average temperature: 56.2 degrees
Departure: -1.9 degrees below normal

Total precipitation: 0.91″
Departure: -2.27″ below normal

1 day with thunder
September 2020 Climate Summary for Hibbing, Minnesota

Average temperature: 50.3 degrees
Departure: -2.8 degrees below normal

Total precipitation: 1.26″
Departure: -1.81″ below normal

4 days with thunder

Note: September 2020 tied with September 2010 for the 6th coldest September in station history.
September 2020 Climate Summary for Ashland, Wisconsin

Average temperature: 55.1 degrees
Departure: -1.6 degrees below normal

Total precipitation: 1.51″
Departure: -2.34″ below normal

2 days with thunder

Source: https://mrcc.illinois.edu/

Tim

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