Bethesda's winters are cold and unpredictable, with temperatures fluctuating wildly between -9°C and 15°C. As spring arrives in March, temperatures gradually warm up, often reaching the mid-20s by April, which averages around 14°C. Summer months bring warmth, with June being the hottest, averaging a pleasant 24°C. Autumn, particularly September, sees a return to cooler temperatures, averaging around 21°C, before dropping again into winter's chill.