Riga's winters are bitterly cold, with temperatures often plummeting below -20°C in January and February, but averaging around -3°C to -4°C. Spring brings a slow warming trend, with March averaging around 2°C and April rising to 6°C. Summer is mild and pleasant, with June and July averaging around 20-22°C, while August cools slightly to 16°C. Autumn is cool again, with September and October temperatures ranging from 0-18°C. December's winter chill returns, with temperatures dipping below -20°C once more.