Mitchell, SD

South Dakota · Records since 1893–2026

🌤️ 87°F
Currently in Mitchell
As of 1:30 PM CDT

Records for September 11

🔥 Record High

101°F

September 11, 1931

+22° from 79° normal

❄ Record Low

31°F

September 11, 1955

-22° from 53° normal
🌞 Normal high: 79°F 🌑 Normal low: 53°F 1991–2020 normals

All-Time Records — Mitchell

🔥
116°F
Hottest Day Ever
Jul 24, 1940
❄
-40°F
Coldest Day Ever
Feb 10, 1994
🌧
4.87"
Wettest Day Ever
Jun 20, 2024
☃
24.0"
Most Snow in One Day
Mar 10, 1956

First & Last Dates — Mitchell

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)
187 days
Longest growing season
1962
101 days
Shortest growing season
1901
155 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 11

# Temp Date
🏆 101°F September 11, 1931
2 99°F September 11, 1998
3 99°F September 11, 1927
4 97°F September 11, 1908
5 96°F September 11, 1974
6 96°F September 11, 1899
7 95°F September 11, 2005
8 95°F September 11, 1988
9 95°F September 11, 1905
10 94°F September 11, 2012

Top 5 Record Lows — September 11

# Temp Date
🥶 31°F September 11, 1955
2 34°F September 11, 1896
3 35°F September 11, 1904
4 36°F September 11, 1929
5 37°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 1893–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Mitchell

threshold: 96°F (90th percentile of historical Jun–Aug highs)
4.2
Avg heat wave length
days (historical)
103°
Avg peak temp
during heat waves
11
Dangerous nights 2026
Overnights ≥ 70°F
1
Heat waves 2026
so far

Days ≥ 90°F Per Year

1894–2026
41
2026 so far
34
Avg/year 1970–2025
32
Avg/year (last 10 complete)
68
Most in a year (1936)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Mitchell

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jul 2, 1936 – Jul 19, 1936 18 115°F (Jul 4) 107°F 72°F
2 Jul 20, 1941 – Jul 30, 1941 11 108°F (Jul 23) 101°F 70°F
3 Jul 17, 1974 – Jul 26, 1974 10 106°F (Jul 21) 100°F 67°F
4 Jul 18, 1932 – Jul 27, 1932 10 104°F (Jul 19) 100°F 68°F
5 Jul 17, 1940 – Jul 25, 1940 9 116°F (Jul 24) 103°F 72°F
6 Jul 2, 1937 – Jul 10, 1937 9 108°F (Jul 6) 99°F 67°F
7 Jul 26, 1987 – Aug 3, 1987 9 99°F (Jul 30) 97°F 71°F
8 Jul 4, 1930 – Jul 11, 1930 8 110°F (Jul 11) 104°F 70°F
9 Jul 18, 1934 – Jul 24, 1934 7 114°F (Jul 21) 107°F 74°F
10 Jul 29, 1955 – Aug 4, 1955 7 107°F (Jul 31) 103°F 74°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

53
2026 total
above-normal nights
41.9
Avg / summer
1970–2020
61
Most in a summer
1936

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 (1893–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1893, annual totals have trended +0.07" per decade, about +1.0" 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 Mitchell is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

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

Precipitation, Year to Date

13.06"
2026 YTD
Normal: 16.74"
-3.68"
3.95"
September so far
September normal: 2.34"
+1.61"
3
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Mitchell is 3.68" behind the normal pace

Period Review — Sep 3 – Sep 10, 2026

Any window, evaluated against every other year on record — 8 days

Quick picks: Last 7 days Last 30 days Last 90 days This month
Seasons: Spring (Mar–May) Summer (Jun–Aug) Fall (Sep–Nov)
75.3°F
Average temperature
13th-warmest of 127
+7.6°
vs. average
Normal: 67.7°F (1991–2020)
3.91"
Precipitation
1st-wettest of 126
+3.22"
vs. average
Normal: 0.69" · 567% of normal

Average Temperature by Year — Sep 3 – Sep 10

1896–2026 · 2026 highlighted · trend +0.14° per decade (warming since 1896)

Precipitation by Year — Sep 3 – Sep 10

1896–2026 · 2026 highlighted · trend +0.01" per decade (wetter since 1896)

Warmest Sep 3 – Sep 10 on Record

# Year Avg Temp
1 1931 81.6°F
2 1933 80.0°F
3 2005 78.8°F
4 1978 78.7°F
5 1947 77.5°F
6 2013 77.4°F
7 1913 76.8°F
8 1927 76.8°F
9 1925 76.3°F
10 1970 75.9°F

Coolest Sep 3 – Sep 10 on Record

# Year Avg Temp
1 1929 56.3°F
2 1918 56.4°F
3 2008 57.7°F
4 1898 58.1°F
5 1896 59.4°F
6 2020 59.4°F
7 1902 59.6°F
8 1956 59.6°F
9 1962 60.1°F
10 1993 60.1°F

Wettest Sep 3 – Sep 10 on Record

# Year Total
1 2026 3.91"
2 1946 3.65"
3 2019 2.94"
4 2003 2.91"
5 1901 2.55"
6 1999 2.37"
7 1947 2.26"
8 1985 2.10"
9 1975 2.09"
10 1989 1.99"

Driest Sep 3 – Sep 10 on Record

# Year Total
1 2021 0.00"
2 2015 0.00"
3 2011 0.00"
4 2005 0.00"
5 1998 0.00"
6 1988 0.00"
7 1979 0.00"
8 1978 0.00"
9 1967 0.00"
10 1959 0.00"
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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