The hottest, coldest, wettest and snowiest days St. Thomas has
recorded — the outer limits of what its weather can do, and how far
they sit beyond a normal day.
Based on 21 years of daily weather observations (2004–present), from the London Cs Ont station 29 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 St. Thomas
has recorded — each shown against what a normal day that time of year
looks like.
🔥Hottest day
98°FJul 22, 2011
The three most extreme on record
198°FJul 22, 2011
297°FJul 18, 2012
397°FJul 21, 2011
❄️Coldest night
-19°FFeb 16, 2015
The three most extreme on record
1-19°FFeb 16, 2015
2-17°FFeb 17, 2014
3-17°FJan 28, 2005
🌧️Most rain in one day
3.79 inSep 21, 2013
The three most extreme on record
13.79 inSep 21, 2013
22.76 inJan 30, 2019
32.71 inSep 11, 2014
In plain terms
Across the record, St. Thomas has reached as high as 98°F and as low as −19°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 — 1991–2020 normals computed from 26 years of daily observations at ST Thomas Wpcp, a weather station, about 2 km from the city centre. The underlying daily records come from NOAA's global station network.