The hottest, coldest, wettest and snowiest days Duncan has
recorded — the outer limits of what its weather can do, and how far
they sit beyond a normal day.
Based on 19 years of daily weather observations (2006–present), from the Halliburton Field Airport station 4 km away. Updated through August 2025 — an all-time extreme only changes when a more extreme day actually occurs, so some dates are old. That is normal, not stale data.
The four kinds of extreme
The hottest, coldest, wettest and snowiest single days Duncan
has recorded — each shown against what a normal day that time of year
looks like.
🔥Hottest day
112°FJul 19, 2022
The three most extreme on record
1112°FJul 19, 2022recent
2111°FJul 9, 2011
3111°FAug 2, 2011
❄️Coldest night
-13°FFeb 16, 2021
The three most extreme on record
1-13°FFeb 16, 2021recent
2-4°FFeb 15, 2021
30°FJan 7, 2017
🌧️Most rain in one day
5.95 inSep 22, 2018
The three most extreme on record
15.95 inSep 22, 2018
22.59 inMay 20, 2017
32.58 inSep 7, 2018
In plain terms
Across the record, Duncan has reached as high as 112°F and as low as −13°F. A single day has delivered over 6 inches of rain. Those are the outer edges worth knowing if you are moving here, planning a trip, or thinking about a house.
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 25 years of daily observations at Henry Post Aaf Airport, a weather station, about 44 km from the city centre. The underlying daily records come from NOAA's global station network.