Duluth, MN

Minnesota · Records since 1874–2026

⛅ 82°F Feels like 79°
Currently in Duluth
As of 1:30 PM CDT

Records for September 11

🔥 Record High

92°F

September 11, 1931

+23° from 69° normal

❄ Record Low

31°F

September 11, 1965

-18° from 49° normal
🌞 Normal high: 69°F 🌑 Normal low: 49°F 1991–2020 normals

All-Time Records — Duluth

🔥
106°F
Hottest Day Ever
Jul 13, 1936
❄
-41°F
Coldest Day Ever
Jan 2, 1885
🌧
5.20"
Wettest Day Ever
Jul 21, 1909
☃
24.1"
Most Snow in One Day
Nov 1, 1991

First & Last Dates — Duluth

How early and how late each seasonal turning point has ever arrived, across the full period of record

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Range ever recorded Normal date (1991–2020)
195 days
Longest growing season
1894
85 days
Shortest growing season
1986
138 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 11

# Temp Date
🏆 92°F September 11, 1931
2 86°F September 11, 1976
3 85°F September 11, 2005
4 84°F September 11, 2024
5 84°F September 11, 2011
6 84°F September 11, 1998
7 83°F September 11, 2012
8 83°F September 11, 1930
9 82°F September 11, 1952
10 82°F September 11, 1948

Top 5 Record Lows — September 11

# Temp Date
🥶 31°F September 11, 1965
2 32°F September 11, 1955
3 33°F September 11, 1985
4 34°F September 11, 1964
5 36°F September 11, 1958
About this data — Records are sourced from the NOAA Threadex dataset via RCC ACIS, a quality-controlled record for long-term climate stations. Threadex adjusts for station relocations and observation-time changes, making records comparable across all years since 1874–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Duluth

threshold: 84°F (90th percentile of historical Jun–Aug highs)
3.8
Avg heat wave length
days (historical)
90°
Avg peak temp
during heat waves
4
Dangerous nights 2026
Overnights ≥ 70°F
1
Heat waves 2026
so far

Days ≥ 90°F Per Year

1874–2026
4
2026 so far
3
Avg/year 1970–2025
3
Avg/year (last 10 complete)
14
Most in a year (1936)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Duluth

# Dates Days Peak Avg High Avg Overnight Low
🏆 Aug 1, 1930 – Aug 8, 1930 8 97°F (Aug 1) 91°F 65°F
2 Jul 1, 2020 – Jul 8, 2020 8 93°F (Jul 2) 88°F 62°F
3 Aug 1, 1878 – Aug 8, 1878 8 92°F (Aug 7) 87°F 66°F
4 Jul 7, 1936 – Jul 13, 1936 7 106°F (Jul 13) 99°F 71°F
5 Aug 22, 1969 – Aug 28, 1969 7 90°F (Aug 28) 86°F 58°F
6 Jul 4, 1988 – Jul 9, 1988 6 97°F (Jul 7) 90°F 63°F
7 Jul 23, 2006 – Jul 28, 2006 6 97°F (Jul 28) 88°F 62°F
8 Jul 12, 2006 – Jul 17, 2006 6 96°F (Jul 15) 89°F 64°F
9 Jun 8, 1956 – Jun 13, 1956 6 92°F (Jun 10) 89°F 59°F
10 Jul 11, 2012 – Jul 16, 2012 6 92°F (Jul 16) 88°F 64°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

Nights where the overnight low exceeded the 1991–2020 normal low

54
2026 total
above-normal nights
39.7
Avg / summer
1970–2020
67
Most in a summer
1878

Above-Normal Summer Nights Per Year

Average June–August Low by Decade

Overnight lows · complete decades only

Precipitation

Annual totals and trend across the full period of record · see this year's standing →

Monthly Precipitation — Last 24 Months

Blue = actual · dashed line = monthly normal

Annual Precipitation Per Year (1871–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1871, annual totals have trended +0.18" per decade, about +2.7" across the record.

Heavy Rain Days Per Year (≥ 1.0")

Compare year-to-year changes in days with heavy rainfall (≥ 1.0")

This Year — 2026

How Duluth is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

123 of 253 days with data were above the 1991–2020 normal high for their date.

Precipitation, Year to Date

21.56"
2026 YTD
Normal: 22.55"
-0.99"
2.00"
September so far
September normal: 3.48"
-1.48"
5
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Duluth is 0.99" behind the normal pace

Period Review — Jun 12 – Sep 10, 2026

Any window, evaluated against every other year on record — 91 days

Quick picks: Last 7 days Last 30 days Last 90 days This month
Seasons: Spring (Mar–May) Summer (Jun–Aug) Fall (Sep–Nov)
66.1°F
Average temperature
20th-warmest of 151
+1.6°
vs. average
Normal: 64.6°F (1991–2020)
11.51"
Precipitation
62nd-wettest of 152
-0.61"
vs. average
Normal: 12.12" · 95% of normal

Average Temperature by Year — Jun 12 – Sep 10

1874–2026 · 2026 highlighted · trend +0.09° per decade (warming since 1874)

Precipitation by Year — Jun 12 – Sep 10

1872–2026 · 2026 highlighted · trend +0.07" per decade (wetter since 1872)

Warmest Jun 12 – Sep 10 on Record

# Year Avg Temp
1 1983 67.9°F
2 1878 67.9°F
3 2012 67.5°F
4 2013 67.3°F
5 2018 67.1°F
6 2006 67.0°F
7 1921 67.0°F
8 2021 66.9°F
9 1995 66.7°F
10 1955 66.6°F

Coolest Jun 12 – Sep 10 on Record

# Year Avg Temp
1 1992 58.4°F
2 1917 59.5°F
3 1972 59.6°F
4 1950 59.8°F
5 1965 60.2°F
6 1924 60.3°F
7 1912 60.4°F
8 1962 60.4°F
9 1891 60.5°F
10 1985 60.5°F

Wettest Jun 12 – Sep 10 on Record

# Year Total
1 1999 22.23"
2 1972 21.15"
3 1991 19.76"
4 1873 18.18"
5 1952 17.58"
6 1951 17.50"
7 1905 17.36"
8 1978 17.36"
9 2002 17.22"
10 1909 16.84"

Driest Jun 12 – Sep 10 on Record

# Year Total
1 1894 3.69"
2 1936 3.72"
3 1918 4.67"
4 1883 4.67"
5 1934 5.44"
6 1878 5.47"
7 1961 5.73"
8 1930 5.73"
9 2007 6.00"
10 1940 6.17"
About this data. Pick any start and end date and this becomes the same kind of review as the Month and Fall tabs, just for exactly the window you asked for — the generalized version of the same engine, evaluated across every year on record. Average temperature is the mean of each day's (high + low) / 2; precipitation is the sum of daily totals. A year missing more than about a fifth of the window's days is excluded from the temperature ranking; any missing day excludes a year from the precipitation ranking, since an unreported day is unreported rain. Ranges that cross from December into January aren't supported yet. Normals are the 1991–2020 mean for the same window.
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