Harlingen experiences mild winters, with temperatures rarely dropping below freezing and averaging around 16°C in January. Spring arrives with gentle warming, reaching an average of 24°C by April, while summer months are warm but not extremely hot, peaking at around 29°C in August. Autumn brings a slight cool-down, with temperatures dipping to around 8°C in October before rising again in November and December, which see mild winter conditions return. The temperature fluctuations throughout the year are relatively moderate, with little extremes observed.