2025 Climate Overview for Duluth, Minnesota.
Average temperature: 40.5 degrees
Mean: 40.6 degrees
Departure: -0.1 degrees below average
Note: 2025 ended up being 4.1 degrees colder than 2024.
Coldest month: January, with an average temperature of 9.0 degrees.
Warmest month: July, with an average temperature of 66.5 degrees.
Lowest temperature: -27 on January 21st
Highest temperature: 88 on July 27th
There were 33 days with temperatures hitting 80 degrees or higher, compared to the average of 27 days. The record is 53 days set in 1988, while the fewest was just 6 days in 1904.
There were 42 days with subzero temperatures, slightly above the average of 40 days. The record is 71 days set in 1875, while the fewest was just 8 days in 1931.
Number of months with temperatures below average: 7
Number of months with temperatures above average: 5
Total precipitation: 20.35 inches
Normal: 31.18 inches
Departure: -10.83 inches below normal
Note: 2025 ranked as the sixth driest year on record and was 7.65 inches drier than 2024.
Wettest month: July, with 3.75 inches of precipitation
Driest month: January, with 0.50 inches of precipitation
There were 10 months with below-average precipitation, compared to only 2 months with above-normal precipitation.
Note: April 2025 was the last month Duluth saw above-average precipitation, ending just 0.12 inches over the norm.
Notes
In 2025, there were 32 days with thunder, which falls right within the normal range of 30 to 40 days.
In 2025, the National Weather Service in Duluth issued 133 warnings in total, with 108 for severe thunderstorms and 25 for tornadoes across northeast Minnesota and northwest Wisconsin.
SPC convective risks in the Northland in 2025
Marginal risk days (level 1/5)
35 days
Slight risk days (level 2/5)
16 days
Enhanced risk days (level 3/5)
3 days
Moderate risk days (level 4/5)
2 days
The most recent marginal risk day occurred on October 4, 2025, while the last slight risk day was on August 21, 2025.
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