Rio Grande do Sul’s climate is Temperate, Subtropical type, classified as Humid Mesothermal (Köppen’s classification). Due to its geographic position, between parallels 27°03"42"" and 33°45"09"" south latitude, and 49º42"41"" and 57º40"57"" west longitude, it presents big differences in relation to Brazil. Latitude reinforces the influence of air masses coming from the polar region and the continental and Atlantic tropical area. The movements and encounters of such masses define many of the State’s climatic characteristics.
The temperatures present great seasonal variation, with hot summers and harsh winters, with occurrence of frost and occasional snowfall. Average temperatures vary between 15 and 18°C, presenting minimum temperatures of -10°C and maximum of 40°C. Concerning precipitation, the State presents a relatively balanced distribution of rainfall throughout the year, due to the oceanic air masses that enter the state.
However, the volume of rainfall is differentiated. At south the average precipitation ranges from 1,299 and 1,500 mm and at north the average ranges from 1,500 to 1,800mm, with more intense rains at the state’s Northeast, especially in the slope of the Plateau, the place presenting the highest precipitation of the State.