The monthly daily average temperature ranges from in January to in August. However, the city is subject to episodes of heat waves during the summer, with 141 days of high temperatures over and fewer than five days of temperatures above . The city is located along the boundary of USDA hardiness zones 9b and 10a. The hottest temperature on record in Brownsville occurred on March 27, 1984, when the city reached . On the other extreme, freezing temperatures occur once or twice a year typically. On December 25, 2004, Brownsville recorded its first instance of measurable snow in 109 years with , and the first recorded White Christmas. Brownsville's lowest temperature on record occurred on February 13, 1899, when the city reached . Based on 30-year averages obtained from the National Oceanic and Atmospheric Administration's National Climatic Data Center weather records, "24/7 Wall St." ranked Brownsville the fifth-hottest city in America in 2016.