Winter months are cold, with January and February averaging around -4°C, while December temperatures range from -19°C to 17°C. Spring brings mild temperatures, with April averaging 5°C and May averaging 9°C, marking a steady rise in warmth. Summer is warm, with June through August averaging above 17°C, reaching highs of up to 33°C in June. Autumn temperatures cool down, but remain relatively mild, averaging around 10°C in October and 3°C in November. Overall, Dieppe's temperature fluctuations are moderate, with cold winters and mild summers.