Rochester, MN

Minnesota · Records since 1886–2026

⛅ 78°F
Currently in Rochester
As of 1:30 PM CDT

Records for September 11

🔥 Record High

94°F

September 11, 1931

+20° from 74° normal

❄ Record Low

24°F

September 11, 1917

-28° from 52° normal
🌞 Normal high: 74°F 🌑 Normal low: 52°F 1991–2020 normals

All-Time Records — Rochester

🔥
108°F
Hottest Day Ever
Jul 14, 1936
❄
-42°F
Coldest Day Ever
Jan 7, 1887
🌧
7.47"
Wettest Day Ever
Jul 11, 1981
☃
19.8"
Most Snow in One Day
Mar 18, 2005

First & Last Dates — Rochester

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)
189 days
Longest growing season
2025
98 days
Shortest growing season
1937
157 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 11

# Temp Date
🏆 94°F September 11, 1931
2 91°F September 11, 2012
3 91°F September 11, 1908
4 90°F September 11, 1948
5 89°F September 11, 2000
6 88°F September 11, 2005
7 88°F September 11, 1920
8 88°F September 11, 1893
9 87°F September 11, 1952
10 87°F September 11, 1942

Top 5 Record Lows — September 11

# Temp Date
🥶 24°F September 11, 1917
2 31°F September 11, 1955
3 35°F September 11, 1959
4 35°F September 11, 1943
5 38°F September 11, 1964
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 1886–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Rochester

threshold: 90°F (90th percentile of historical Jun–Aug highs)
4.7
Avg heat wave length
days (historical)
96°
Avg peak temp
during heat waves
7
Dangerous nights 2026
Overnights ≥ 70°F
1
Heat waves 2026
so far

Days ≥ 90°F Per Year

1886–2026
6
2026 so far
11
Avg/year 1970–2025
6
Avg/year (last 10 complete)
38
Most in a year (1934)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Rochester

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jul 5, 1936 – Jul 18, 1936 14 108°F (Jul 14) 102°F 68°F
2 Jul 21, 1941 – Aug 1, 1941 12 99°F (Jul 24) 94°F 68°F
3 Jul 12, 1932 – Jul 21, 1932 10 99°F (Jul 20) 94°F 67°F
4 Jul 22, 1916 – Jul 31, 1916 10 98°F (Jul 28) 95°F 67°F
5 Jun 18, 1943 – Jun 27, 1943 10 98°F (Jun 26) 92°F 70°F
6 Jun 17, 1910 – Jun 26, 1910 10 97°F (Jun 24) 94°F 62°F
7 Jun 22, 1934 – Jun 30, 1934 9 105°F (Jun 27) 96°F 60°F
8 Aug 25, 1953 – Sep 2, 1953 9 93°F (Aug 31) 91°F 66°F
9 Jul 27, 1988 – Aug 3, 1988 8 102°F (Jul 31) 96°F 66°F
10 Jul 28, 1955 – Aug 4, 1955 8 100°F (Jul 28) 97°F 72°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

59
2026 total
above-normal nights
42.6
Avg / summer
1970–2020
60
Most in a summer
1949

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 (1886–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1886, annual totals have trended +1.12" per decade, about +15.6" 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 Rochester is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

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

Precipitation, Year to Date

24.88"
2026 YTD
Normal: 26.75"
-1.87"
2.09"
September so far
September normal: 3.60"
-1.51"
9
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Rochester is 1.87" 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)
71.1°F
Average temperature
11th-warmest of 114
+4.4°
vs. average
Normal: 66.8°F (1991–2020)
2.65"
Precipitation
49th-driest of 113
-1.23"
vs. average
Normal: 3.88" · 68% of normal

Average Temperature by Year — Aug 11 – Sep 10

1886–2026 · 2026 highlighted

Precipitation by Year — Aug 11 – Sep 10

1886–2026 · 2026 highlighted · trend +0.09" per decade (wetter since 1886)

Warmest Aug 11 – Sep 10 on Record

# Year Avg Temp
1 1947 75.4°F
2 1948 72.6°F
3 1913 72.4°F
4 1937 72.4°F
5 1936 72.3°F
6 1983 72.3°F
7 1959 72.1°F
8 1960 71.8°F
9 1978 71.6°F
10 2013 71.3°F

Coolest Aug 11 – Sep 10 on Record

# Year Avg Temp
1 1992 61.1°F
2 1934 61.4°F
3 1967 61.8°F
4 1986 61.9°F
5 1968 62.8°F
6 1887 63.1°F
7 1892 63.1°F
8 1974 63.2°F
9 1950 63.3°F
10 1935 63.3°F

Wettest Aug 11 – Sep 10 on Record

# Year Total
1 2007 14.63"
2 1946 8.34"
3 1938 8.13"
4 2016 7.70"
5 2014 7.65"
6 1887 7.58"
7 1947 7.45"
8 1985 7.17"
9 1959 6.92"
10 1964 6.66"

Driest Aug 11 – Sep 10 on Record

# Year Total
1 2003 0.27"
2 1953 0.42"
3 1945 0.54"
4 1967 0.71"
5 1950 0.85"
6 1955 0.90"
7 1908 0.92"
8 1888 0.92"
9 1984 0.95"
10 2012 1.11"
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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