March 2017 Average normal temperatures 25 20 15 10 5 0 April May June July August September October November December January February March The average temperature over the quarter was stable compared to 2016 at 6 9 °C, or 0 3 °C' above normal... Finally, the month of March 2017 was the hottest since 1900 (tied with 1957,) with temperatures reaching 10 5 °C, i. e. 2 0 °C' above normal Source.