Bellingham's winters are cool and occasionally frigid, with temperatures often below freezing and occasional dips into single-digit lows. Spring arrives in March, bringing slowly warming temperatures that can still drop to near-freezing on some days. By May, temperatures have risen significantly, reaching the mid-twenties Celsius, and remain pleasant through June when highs can soar above thirty-eight degrees Celsius. Summer months of July and August are mild, with temperatures rarely exceeding twenty-nine degrees Celsius, while September sees a slight cooling trend. Autumn brings another period of mild weather, with October temperatures similar to those in April before dropping off again in November and December, which are generally quite cool.