Pittsburgh's winters are typically cold and unpredictable, with temperatures fluctuating wildly between extremely low and mild days. By March, the city has warmed significantly, with average highs often reaching into the mid-teens to low twenties Celsius. Spring arrives in April, bringing moderate temperatures that gradually warm throughout the month. Summer is warm and humid, with June and July being the hottest months, while September marks a transition back to milder conditions. Autumn brings crisp days and cooler nights, but temperatures can still dip below freezing by November.