Aberdeen, SD

South Dakota · Records since 1893–2026

☁️ 76°F
Currently in Aberdeen
As of 12:30 PM CDT

Records for September 7

🔥 Record High

101°F

September 7, 1897

+23° from 78° normal

❄ Record Low

29°F

September 7, 1895

-21° from 50° normal
🌞 Normal high: 78°F 🌑 Normal low: 50°F 1991–2020 normals

All-Time Records — Aberdeen

🔥
115°F
Hottest Day Ever
Jul 9, 1936
❄
-46°F
Coldest Day Ever
Jan 12, 1912
🌧
7.62"
Wettest Day Ever
May 5, 2007
☃
18.0"
Most Snow in One Day
Mar 28, 1900

Top 10 Record Highs — September 7

# Temp Date
🏆 101°F September 7, 1897
2 98°F September 7, 1931
3 97°F September 7, 1978
4 96°F September 7, 2002
5 96°F September 7, 1896
6 95°F September 7, 1902
7 94°F September 7, 1980
8 94°F September 7, 1913
9 94°F September 7, 1906
10 93°F September 7, 1952

Top 5 Record Lows — September 7

# Temp Date
🥶 29°F September 7, 1895
2 33°F September 7, 2025
3 36°F September 7, 1949
4 37°F September 7, 1898
5 38°F September 7, 2017
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 — Aberdeen

threshold: 94°F (90th percentile of historical Jun–Aug highs)
4.2
Avg heat wave length
days (historical)
102°
Avg peak temp
during heat waves
5
Dangerous nights 2026
Overnights ≥ 70°F
0
Heat waves 2026
so far

2026 Daily High Temperature vs Normal

Year to date
Above normal Below normal

136 of 249 days with data were above the 1991–2020 normal high for their date.

Days ≥ 90°F Per Year

1893–2026
25
2026 so far
25
Avg/year 1970–2025
24
Avg/year (last 10 complete)
69
Most in a year (1936)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Aberdeen

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jul 2, 1936 – Jul 19, 1936 18 115°F (Jul 6) 107°F 70°F
2 Jul 20, 1941 – Jul 29, 1941 10 109°F (Jul 23) 102°F 68°F
3 Jul 17, 1899 – Jul 25, 1899 9 106°F (Jul 21) 100°F 60°F
4 Jul 13, 1932 – Jul 21, 1932 9 106°F (Jul 19) 100°F 67°F
5 Jul 31, 1930 – Aug 8, 1930 9 105°F (Aug 1) 100°F 64°F
6 May 27, 1934 – Jun 3, 1934 8 110°F (May 30) 99°F 64°F
7 Jul 17, 1901 – Jul 24, 1901 8 107°F (Jul 22) 103°F 68°F
8 Aug 17, 1976 – Aug 24, 1976 8 104°F (Aug 17) 100°F 71°F
9 Jul 17, 1940 – Jul 24, 1940 8 103°F (Jul 24) 100°F 68°F
10 Jul 5, 1930 – Jul 11, 1930 7 111°F (Jul 10) 102°F 67°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
44.4
Avg / summer
1970–2020
64
Most in a summer
1983

Above-Normal Summer Nights Per Year

Average June–August Low by Decade

Overnight lows · complete decades only

Precipitation

Actual vs. 1991–2020 full-month and full-season normals

16.01"
2026 YTD
Normal: 16.75"
-0.74"
0.01"
September so far
September normal: 1.99"
-1.98"
3
2026 heavy rain days
Days with ≥ 1.0"

2026 Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Aberdeen is 0.74" behind the normal pace

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 -0.40" per decade, about -5.3" across the record.

Heavy Rain Days Per Year (≥ 1.0")

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

Month in Review — August 2026

69.9°F

Average temperature · August 2026

195th-warmest month on record

72nd-warmest August of 132 on record

+0.7° vs. 69.2° average (1991–2020)
84.8°F
Warmest month ever
July 1936
78.2°F
Warmest August ever
1937
96°F
Hottest of 2026
Jul 26

Average August Temperature by Year

1893–2026 · 2026 highlighted

Precipitation — August 2026

Month total against the 1991–2020 average and every other August on record

1.17"
Total precipitation
August 2026
-1.07"
vs. average
Normal: 2.24" · 52% of normal
29th-driest
August rank
of 131 on record
6.71"
Wettest August ever
2023 · driest 0.06" (1947)

August Precipitation by Year

1893–2026 · 2026 highlighted · trend -0.02" per decade (drier since 1893)

Wettest Augusts on Record

# Year Total
1 2023 6.71"
2 1942 6.62"
3 1903 6.59"
4 2014 6.19"
5 1930 6.13"
6 1980 5.93"
7 1900 5.45"
8 1915 5.44"
9 1911 5.32"
10 1990 4.85"

Driest Augusts on Record

# Year Total
1 1947 0.06"
2 1996 0.24"
3 1970 0.33"
4 2013 0.34"
5 1982 0.44"
6 1972 0.52"
7 1922 0.52"
8 1938 0.64"
9 1933 0.64"
10 1976 0.66"

Warmest Augusts on Record

# Year Avg Temp
1 1937 78.2°F
2 1947 76.8°F
3 1983 76.5°F
4 1938 76.0°F
5 1976 75.9°F
6 1936 75.7°F
7 1973 75.6°F
8 1922 75.5°F
9 1900 75.0°F
10 1930 74.3°F

Warmest Months on Record (Any Month)

# Month Avg Temp
1 July 1936 84.8°F
2 June 1933 79.1°F
3 July 1935 78.7°F
4 July 1930 78.6°F
5 July 1975 78.3°F
6 August 1937 78.2°F
7 July 1901 77.8°F
8 July 1974 77.4°F
9 July 1933 77.3°F
10 July 1931 77.1°F

Nearby Stations — August 2026

How the same month ranked at the closest reporting stations

Station Avg Temp August Rank
Aberdeen, SD 69.9°F 72nd of 132
Sisseton, SD 68.7°F 65th of 94
Huron, SD 72.4°F 53rd of 146
Mobridge, SD 71.6°F 63rd of 107
Mitchell, SD 73.5°F 47th of 126
About this data. Monthly averages are the mean of daily average temperatures, computed from NOAA Threadex records via RCC ACIS. Months missing more than three days of observations are excluded from the rankings, so the in-progress month never appears. Rankings cover 1,550 complete months on record. Precipitation totals sum the daily reports for the month, with trace amounts counted as zero. A month missing any day of precipitation data is left out entirely (an unreported day is unreported rain), so the precipitation ranking covers 131 complete Augusts. Normals are the 1991–2020 mean for the same calendar month. Trend lines are a least-squares fit across every year shown.

Fall in Review — Fall 2026

September 1 – November 30, 2026

Fall 2026 is still under way. Season totals and rankings appear once November closes; the markers below update as they happen.

Summer to Winter — 2026

Each turning point of the season against its 1991–2020 normal date, with the earliest and latest on record

Marker 2026 Normal vs. normal Earliest Latest Drift
Last 90°F day
The final day of summer heat
 Sep 5
so far
 Sep 9 Apr 20, 1915 Oct 18, 1910 +0.3 d/decade
Last 80°F day
The last genuinely warm afternoon
 Sep 6
so far
 Oct 5 Aug 31, 1986 Oct 30, 1950 -0.4 d/decade
First high below 50°F
The first afternoon that stays cold
 not yet Oct 9 Sep 9, 1962 Nov 12, 1963 +0.4 d/decade
First 32°F freeze
Growing season over
 not yet Sep 25 Aug 28, 1893 Oct 17, 1957 +0.4 d/decade
First 28°F hard freeze
Cold enough to end tender growth
 not yet Oct 6 Sep 9, 1898 Nov 4, 1931 +0.8 d/decade
First 20°F night
Winter cold arriving
 not yet Oct 23 Sep 16, 1916 Dec 1, 1929 +0.5 d/decade
First measurable snow
0.1" or more in a day
 not yet Oct 30 Sep 21, 1995 Dec 23, 1939 -1.7 d/decade

Drift is a least-squares fit across every year on record. Positive means the marker has been arriving later.

First Freeze by Year

The first 32°F night of each autumn since 1893 · trending +0.4 days later per decade

137
Normal length
1991–2020 average
171
Longest on record
1922
74
Shortest on record
1902

Growing Season Length by Year

Days between the last spring freeze and the first fall freeze · trending +1.0 days longer per decade

Fall Average Temperature by Year

1896–2025 · 2026 highlighted

Fall Precipitation by Year

1893–2025 · 2026 highlighted · trend -0.03" per decade (drier since 1893)

About this data. Fall is meteorological autumn, September 1 through November 30, the window NOAA uses for seasonal statistics. Seasonal temperature is the day-weighted mean of the three monthly means; precipitation is their sum, and a season missing any of the three months is left out of the rankings. Freeze, heat and snow markers come from daily NOAA Threadex observations via RCC ACIS: freezes and snow are the first occurrence on or after July 1, and the last 90°F and 80°F days are the final ones anywhere in the calendar year. Growing season counts the freeze-free days between the last spring 32°F and the first fall 32°F.
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