Taichung has a warm humid subtropical climate (Köppen Cwa) bordering on a tropical monsoon climate, with an average annual temperature of 23.3 °C (73.9 °F) with the highest temperature of the year occur in July and August, while the lowest temperature occur in January and February.[21] Daytime temperatures maintains warm to hot year-round, though night time temperatures during the winter months are significantly cooler than those during the summer and the warm daytime temperature. The average annual rainfall is just above 1,700 millimetres (67 in).[22] The average humidity is 80%.