San Francisco's climate is marked by mild temperatures throughout the year, with minimal seasonal variations. Winters are cool and foggy, with temperatures ranging from near-freezing to the mid-20s Celsius, averaging around 10°C. As spring arrives in March, temperatures slowly rise, gradually warming up to the mid-30s Celsius by May. Summer months are warm, but not hot, with highs often reaching the low 40s Celsius, while autumn brings a return to cooler conditions, with temperatures dropping back down into the teens and twenties by winter.