Greenwich experiences a cool and unpredictable climate year-round, with temperatures often fluctuating widely between day and night. Winters are chilly, with average temperatures ranging from around 0-2°C in January and February, while occasional cold snaps can bring temperatures as low as -9°C. As spring approaches, temperatures gradually rise, with April and May averaging around 12-16°C. Summers are mild to warm, with July and August averages of around 24-25°C, but the mercury rarely rises above 37°C. Autumn is generally cool, with September and October averages around 22-17°C, before dropping again in November and December.