Orillia is a weather station located 285 m above sea level, 9 km from Orillia. Its records go back to 1894: 73 years of temperature are available up to 2020, along with rainfall and a comparison with two reference normals. Closed series: the records of this station end in 2020. Over the whole series (73 years) the annual mean temperature there is 6.1 °C; the 1961–1990 and 1991–2020 reference periods are not documented well enough for a comparison. The warmest year of the series is 2020 (9.3 °C) and the coldest 1904 (3.7 °C). The last complete year, 2020, ranks 1 out of 73, from warmest to coldest. Over 1961–2020, the annual mean temperature changes by +0.53 °C per decade. The station ranks 2 out of 240 stations, from the fastest rise to the slowest.
Annual mean temperature since 1894
The first ten years of the series (1894–1906) average 5.5 °C; the last ten (1988–2020) average 7.4 °C, a difference of +1.9 °C. Of the ten warmest years in the series, 3 fall after 1999. The warmest is 2020 (9.3 °C). The ten-year running mean peaks at 7.0 °C (1991) and bottoms out at 5.3 °C (1904).
Annual rainfall since 1894
On average 1017 mm of rain falls per year over the 65 documented years. The wettest year, 1995, received 1382 mm; the driest, 1907, only 736 mm, which is 1.9 times less. Between 1972 and 1999, 16 years out of 20 exceeded the series average.
Records at Orillia
- Warmest year: 9.3 °C, in 2020
- Coldest year: 3.7 °C, in 1904
- Driest year: 736 mm, in 1907
- Wettest year: 1382 mm, in 1995
- Warmest month: 24.0 °C, in July 1916
- Coldest month: −17.7 °C, in February 1934
- Wettest month: 305 mm, in December 1878
- Hottest day: 36.0 °C, on 7 July 1988
- Coldest day: −36.0 °C, on 10 January 1982
- Heaviest rain in one day: 100.0 mm, on 31 December 2001
5.6 °C separate the warmest year of the series from the coldest. Between the hottest and the coldest day on record, the range reaches 72.0 °C.
Temperature trend over 1961–2020
The regression line of annual mean temperature changes by +0.53 °C per decade between 1961 and 2020, about +3.1 °C over the whole period. That is faster than the median of the 240 stations (+0.25 °C per decade), by 0.28 °C per decade: the station ranks 2 out of 240.
Data source and licence
Data source: Environment and Climate Change Canada (dataset “AHCCD (ahccd-monthly) + climate-daily”), licence Open Government Licence – Canada. Last updated: 29 October 2026.
The data for Orillia are shown as the source publishes them; this site does not correct them. A year is kept only if at least eleven months of measurements are available, and a normal is computed only with at least twenty years of data out of its thirty. Temperatures are rounded to 0.1 °C and rainfall to the millimetre. The station is one of 240 stations in Canada: the overview page lets you compare them.
Frequently asked questions
What is the annual mean temperature at Orillia?
Over the whole series (73 years), the annual mean temperature at Orillia is 6.1 °C.
What is the warmest year ever measured at Orillia?
Since records began in 1894, the warmest year at Orillia is 2020, at 9.3 °C on average. The coldest is 1904 (3.7 °C).
Is the climate at Orillia getting warmer?
Yes: at Orillia, the annual mean temperature rises by 0.53 °C per decade between 1961 and 2020, +3.1 °C in total. 3 of the 10 warmest years in the series fall after 1999.
Towns near this station
Neighbouring stations