Aberdeen, SD

South Dakota · Records since 1893–2026

☁️ 84°F
Currently in Aberdeen
As of 1:00 PM CDT

Records for September 11

🔥 Record High

100°F

September 11, 1927

+23° from 77° normal

❄ Record Low

28°F

September 11, 1940

-21° from 49° normal
🌞 Normal high: 77°F 🌑 Normal low: 49°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

First & Last Dates — Aberdeen

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)
171 days
Longest growing season
1922
74 days
Shortest growing season
1902
137 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 11

# Temp Date
🏆 100°F September 11, 1927
2 98°F September 11, 1931
3 96°F September 11, 1978
4 95°F September 11, 1948
5 94°F September 11, 1990
6 94°F September 11, 1936
7 93°F September 11, 2018
8 90°F September 11, 1952
9 90°F September 11, 1899
10 90°F September 11, 1893

Top 5 Record Lows — September 11

# Temp Date
🥶 28°F September 11, 1940
2 29°F September 11, 1964
3 29°F September 11, 1955
4 30°F September 11, 1898
5 33°F September 11, 1894
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

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

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 -0.40" 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")

This Year — 2026

How Aberdeen is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

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

Precipitation, Year to Date

16.04"
2026 YTD
Normal: 17.02"
-0.98"
0.04"
September so far
September normal: 1.99"
-1.95"
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 · Aberdeen is 0.98" 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)
71.0°F
Average temperature
28th-warmest of 132
+3.5°
vs. average
Normal: 67.5°F (1991–2020)
1.20"
Precipitation
32nd-driest of 130
-1.13"
vs. average
Normal: 2.33" · 52% of normal

Average Temperature by Year — Aug 11 – Sep 10

1893–2026 · 2026 highlighted

Precipitation by Year — Aug 11 – Sep 10

1893–2026 · 2026 highlighted · trend +0.01" per decade (wetter since 1893)

Warmest Aug 11 – Sep 10 on Record

# Year Avg Temp
1 1937 75.8°F
2 1976 74.6°F
3 1913 74.4°F
4 1922 74.3°F
5 1978 74.1°F
6 1947 73.8°F
7 1983 73.8°F
8 1931 73.6°F
9 1936 73.5°F
10 1970 73.3°F

Coolest Aug 11 – Sep 10 on Record

# Year Avg Temp
1 1992 61.7°F
2 1964 62.5°F
3 1914 62.6°F
4 1910 62.7°F
5 1986 62.9°F
6 1968 63.2°F
7 2004 63.2°F
8 1951 63.5°F
9 1956 63.6°F
10 1917 63.9°F

Wettest Aug 11 – Sep 10 on Record

# Year Total
1 1903 6.79"
2 1990 6.34"
3 1999 5.89"
4 2014 5.63"
5 1980 5.43"
6 2021 5.23"
7 1942 4.88"
8 1900 4.70"
9 1930 4.70"
10 2009 4.44"

Driest Aug 11 – Sep 10 on Record

# Year Total
1 2003 0.12"
2 1969 0.15"
3 1974 0.18"
4 1982 0.44"
5 1965 0.45"
6 1972 0.48"
7 1953 0.49"
8 1952 0.50"
9 1947 0.50"
10 2013 0.70"
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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