Oakville's winters are cold and variable, with temperatures often dropping below -20°C in January and February, but occasionally rising into the single digits. Spring arrives slowly, with March bringing occasional warmth, while April and May see a steady increase in temperatures, reaching averages above 10°C by late spring. Summers are warm to hot, with July and August being the warmest months, averaging around 24°C, although temperatures can occasionally soar above 30°C. Autumn is generally mild, with September and October experiencing pleasant temperatures before cooling off again. Winters return in December, with temperatures ranging from just below freezing to near -20°C, marking a gradual decline towards winter's chill.