International Falls, MN

Minnesota · Records since 1897–2026

☁️ 78°F
Currently in International Falls
As of 1:30 PM CDT

Records for September 11

🔥 Record High

86°F

September 11, 2005

+18° from 68° normal

❄ Record Low

29°F

September 11, 1955

-15° from 44° normal
🌞 Normal high: 68°F 🌑 Normal low: 44°F 1991–2020 normals

All-Time Records — International Falls

🔥
103°F
Hottest Day Ever
Jul 22, 1923
❄
-55°F
Coldest Day Ever
Jan 6, 1909
🌧
4.82"
Wettest Day Ever
Aug 30, 1942
☃
14.1"
Most Snow in One Day
Jan 10, 1975

First & Last Dates — International Falls

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)
150 days
Longest growing season
1919
58 days
Shortest growing season
2004
110 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 11

# Temp Date
🏆 86°F September 11, 2005
2 86°F September 11, 1990
3 86°F September 11, 1976
4 85°F September 11, 1952
5 83°F September 11, 2011
6 82°F September 11, 2018
7 82°F September 11, 2012
8 82°F September 11, 1906
9 79°F September 11, 1997
10 79°F September 11, 1963

Top 5 Record Lows — September 11

# Temp Date
🥶 29°F September 11, 1955
2 31°F September 11, 1993
3 31°F September 11, 1964
4 32°F September 11, 2006
5 32°F September 11, 1985
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 1897–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — International Falls

threshold: 86°F (90th percentile of historical Jun–Aug highs)
4.1
Avg heat wave length
days (historical)
92°
Avg peak temp
during heat waves
2
Dangerous nights 2026
Overnights ≥ 70°F
1
Heat waves 2026
so far

Days ≥ 90°F Per Year

1897–2026
5
2026 so far
5
Avg/year 1970–2025
4
Avg/year (last 10 complete)
18
Most in a year (1921)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — International Falls

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jun 16, 1910 – Jul 1, 1910 16 99°F (Jun 21) 93°F 60°F
2 Jun 20, 1921 – Jul 3, 1921 14 99°F (Jun 30) 93°F 55°F
3 Jul 8, 1921 – Jul 18, 1921 11 96°F (Jul 12) 90°F 57°F
4 Jul 17, 1923 – Jul 26, 1923 10 103°F (Jul 22) 93°F 63°F
5 Jun 14, 1995 – Jun 23, 1995 10 99°F (Jun 17) 93°F 63°F
6 Jun 25, 1912 – Jul 1, 1912 7 101°F (Jun 27) 92°F 62°F
7 Aug 14, 2021 – Aug 20, 2021 7 93°F (Aug 19) 91°F 63°F
8 May 25, 1919 – May 31, 1919 7 92°F (May 28) 89°F 58°F
9 Aug 13, 1906 – Aug 19, 1906 7 91°F (Aug 13) 90°F 61°F
10 Jul 9, 1916 – Jul 15, 1916 7 90°F (Jul 14) 88°F 64°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

51
2026 total
above-normal nights
50.8
Avg / summer
1970–2020
71
Most in a summer
1983

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 (1895–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1895, annual totals have trended +0.79" per decade, about +10.3" 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 International Falls is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

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

Precipitation, Year to Date

13.83"
2026 YTD
Normal: 18.80"
-4.97"
1.10"
September so far
September normal: 3.00"
-1.90"
2
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · International Falls is 4.97" behind the normal pace

Period Review — Aug 11 – Sep 10, 2026

Any window, evaluated against every other year on record — 31 days

Quick picks: Last 7 days Last 30 days Last 90 days This month
Seasons: Spring (Mar–May) Summer (Jun–Aug) Fall (Sep–Nov)
62.8°F
Average temperature
39th-warmest of 100
+1.4°
vs. average
Normal: 61.4°F (1991–2020)
3.47"
Precipitation
43rd-wettest of 108
+0.39"
vs. average
Normal: 3.08" · 113% of normal

Average Temperature by Year — Aug 11 – Sep 10

1897–2026 · 2026 highlighted

Precipitation by Year — Aug 11 – Sep 10

1897–2026 · 2026 highlighted · trend -0.05" per decade (drier since 1897)

Warmest Aug 11 – Sep 10 on Record

# Year Avg Temp
1 1913 66.6°F
2 1983 66.6°F
3 1991 66.4°F
4 1906 66.1°F
5 1973 65.9°F
6 1922 65.6°F
7 1981 65.6°F
8 1996 65.5°F
9 1948 65.2°F
10 1969 65.2°F

Coolest Aug 11 – Sep 10 on Record

# Year Avg Temp
1 1908 55.3°F
2 1977 55.5°F
3 1926 55.8°F
4 1950 56.4°F
5 1964 56.5°F
6 1917 56.8°F
7 1958 56.8°F
8 1956 57.1°F
9 1968 57.1°F
10 1985 57.1°F

Wettest Aug 11 – Sep 10 on Record

# Year Total
1 1942 11.35"
2 1961 7.55"
3 1951 6.86"
4 1977 6.01"
5 1959 5.89"
6 1913 5.84"
7 1992 5.74"
8 1999 5.68"
9 1973 5.65"
10 2019 5.57"

Driest Aug 11 – Sep 10 on Record

# Year Total
1 1967 0.26"
2 1990 0.37"
3 1976 0.40"
4 1952 0.61"
5 1906 0.68"
6 2006 0.72"
7 1920 0.87"
8 2025 1.03"
9 1969 1.21"
10 1915 1.33"
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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