Except for a small subtropical area in the northwest, the climate is even throughout Uruguay. Temperatures are generally mild, but seasons are distinct: summer daytime temperatures average 70 degrees Fahrenheit and rarely exceed the mid-90s; autumn (March-May) is mild; and spring (September-November) is often damp, cool and windy. In winter, monthly temperatures range from 44ï¿½ 60 degrees Fahrenheit with rare frost. However, humidity, averaging 75% year round, intensifies the cold. Average annual rainfall is 39.5 inches.