Winters in West Haven are cold and snowy, with temperatures often below freezing, averaging around 0°C in January and February. Spring is a gradual warming period, with March and April temperatures rising to an average of 5°C and 10°C respectively. Summer months bring pleasant warmth, with July and August averaging highs near 24°C, but also occasional heatwaves above 35°C. Autumn brings a return to cooler temperatures, with September and October averages dropping back down to around 20°C and 15°C respectively. December's temperatures are typically just as cold as January and February, indicating a mild winter climate overall.