Três Marias is a small Brazilian city in northwestern Minas Gerais. In 2007 the population was 26,431 in a total area of 2,763 km². ==Climate== The climate is tropical semi-humid, with an annual average temperature of 22.5 degrees Celsius, and an average annual maximum of 28.8 °F; average annual minimum: 16.5 °C; average annual rainfall: 1442 ...