Winters in Florissant are cold and variable, with temperatures often dropping below freezing, averaging around 1°C in January. February is even colder, with lows reaching as low as -22°C. As the season progresses, temperatures slowly rise, with March marking a significant increase, averaging 10°C. Spring arrives in April, bringing warmer temperatures that steadily climb throughout May and June, with average highs reaching up to 25°C. Summer months of July and August are mild, but still quite warm, with average highs around 26°C. Autumn begins in September, with temperatures gradually cooling, before dropping again in November and December, which experience similar cold temperatures as January and February.