Winters in Shawinigan are harsh and cold, with temperatures often dropping below -30°C in January and February, but slowly warming up by March. Spring arrives in April, bringing mild temperatures ranging from -13°C to 23°C, signaling the end of winter's chill. Summer months, June to August, are warm and pleasant, with highs reaching up to 34°C, while autumn brings a return to cooler temperatures, gradually decreasing throughout September and October. By November and December, temperatures drop again, bringing back the cold and darkness of winter. Overall, Shawinigan experiences significant temperature fluctuations between seasons, with summer being the warmest and mildest period.