Winters in Calais are cool and unpredictable, with temperatures often fluctuating between freezing point and mild highs. The coldest months, January and February, see average temperatures around 4-5°C, while the warmer winter days can reach up to 18°C. Spring arrives gradually, with March marking a significant increase in temperature, reaching averages of 7°C by April. Summer brings stable warmth, with June to August averaging around 17°C, although temperatures can occasionally soar above 28°C. Autumn is relatively mild, with October and November experiencing average temperatures between 5-12°C, before cooling off again in the winter months.