Hartford's winters are cold and variable, with temperatures often dropping below freezing and averaging around -1°C in January and February. Spring arrives in March with temperatures slowly warming up, reaching averages of 5°C by the end of the month and continuing to rise through April, which sees highs of up to 25°C. Summer is mild, with July and August being the warmest months, averaging around 22-23°C, although temperatures can still drop below 10°C on occasion. Autumn brings a return to cooler temperatures, with September seeing an average high of 19°C before dropping back down into winter by November, which sees averages of around 5°C once again. December is the coolest month of the year, averaging just 3°C, and often sees temperatures drop below -9°C.