The highest temperature ever recorded in Ottawa was  on 4 July 1913, 1 August 1917 and 11 August 1944. The coldest temperature ever recorded was −38.9 °C (−38 °F) on 29 December 1933. The hottest daily low temperature was  on 9 July 1955. The coldest daily high temperature was  on the same day as the record low. The hottest month on record was July 1921, averaging . The coldest month on record was February 1934, averaging 