The hottest, coldest, wettest and snowiest days Marshalltown 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 Marshalltown Municipal Apt station 7 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 Marshalltown
has recorded — each shown against what a normal day that time of year
looks like.
🔥Hottest day
102°FJul 25, 2012
The three most extreme on record
1102°FJul 25, 2012
2100°FJun 27, 2012
3100°FJul 23, 2012
❄️Coldest night
-26°FJan 16, 2009
The three most extreme on record
1-26°FJan 16, 2009
2-25°FJan 15, 2009
3-24°FJan 1, 2018
🌧️Most rain in one day
4.30 inMay 30, 2008
The three most extreme on record
14.30 inMay 30, 2008
24.03 inApr 27, 2009
33.61 inAug 12, 2016
In plain terms
Across the record, Marshalltown has reached as high as 102°F and as low as −26°F. A single day has delivered over 4 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 — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Waterloo Muni AP (NOAA GHCN station USW00094910), about 70 km from the city centre.