Temperature
The average annual temperature in Orillia is 6.5 °C (43.7 °F). The warmest month is July with an average temperature of 20.6 °C (69.1 °F), and the coldest month is January with an average temperature of -7.8 °C (18.0 °F). The highest temperature ever recorded in Orillia was 38.9 °C (102.0 °F) on August 18, 1936, and the lowest temperature ever recorded was -36.7 °C (-34.1 °F) on February 29, 1940.
Precipitation
The average annual precipitation in Orillia is 943 mm (37.1 in). The wettest month is September with an average precipitation of 114 mm (4.5 in), and the driest month is February with an average precipitation of 63 mm (2.5 in).
Snowfall
The average annual snowfall in Orillia is 186 cm (73.2 in). The snowiest month is February with an average snowfall of 53 cm (20.9 in), and the least snowy month is July with an average snowfall of 0.0 cm (0.0 in).