 Since records began in 1948, the hottest temperature in Dalhart has been on June 26, 2011, and the coldest on January 4, 1959.On average, 65 afternoons each year will reach or top , 133.8 mornings will fall to or below freezing, 10.1 afternoons will fail to top freezing, and two mornings will fall to or below .The hottest complete month has been July 2011 with a mean maximum of and the coldest January 1963 with a mean minimum of .