St Catharines is a weather station located 79 m above sea level, 8 km from Virgil. Its records go back to 1915: 80 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 1991–2020 the annual mean temperature there is 9.7 °C; the 1961–1990 period is not documented well enough to compare. The warmest year of the series is 2012 (11.5 °C) and the coldest 1926 (6.8 °C). The last complete year, 2020, ranks 4 out of 80, from warmest to coldest. Over 1961–2020, the annual mean temperature changes by +0.22 °C per decade. The station ranks 148 out of 240 stations, from the fastest rise to the slowest.
Annual mean temperature since 1915
The first ten years of the series (1915–1927) average 8.2 °C; the last ten (2011–2020) average 10.1 °C, a difference of +1.9 °C. Of the ten warmest years in the series, 6 fall after 1999. The warmest is 2012 (11.5 °C). The ten-year running mean peaks at 10.1 °C (2020) and bottoms out at 8.0 °C (1929).
Annual rainfall since 1915
On average 1004 mm of rain falls per year over the 67 documented years. The wettest year, 1985, received 1327 mm; the driest, 1941, only 698 mm, which is 1.9 times less. Over 1991–2020, January is on average the wettest month (102 mm) and February the driest (51 mm). Between 1986 and 2009, 13 years out of 20 exceeded the series average.
Records at St Catharines
- Warmest year: 11.5 °C, in 2012
- Coldest year: 6.8 °C, in 1926
- Driest year: 698 mm, in 1941
- Wettest year: 1327 mm, in 1985
- Warmest month: 25.2 °C, in July 2020
- Coldest month: −10.0 °C, in February 1934
- Wettest month: 248 mm, in September 1977
4.7 °C separate the warmest year of the series from the coldest. Daily records are not part of the dataset for this station: only annual and monthly extremes are shown.
Temperature trend over 1961–2020
The regression line of annual mean temperature changes by +0.22 °C per decade between 1961 and 2020, about +1.3 °C over the whole period. That is slower than the median of the 240 stations (+0.25 °C per decade), by 0.03 °C per decade: the station ranks 148 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 St Catharines 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 St Catharines?
Over 1991–2020, the annual mean temperature at St Catharines is 9.7 °C.
What is the warmest year ever measured at St Catharines?
Since records began in 1915, the warmest year at St Catharines is 2012, at 11.5 °C on average. The coldest is 1926 (6.8 °C).
Is the climate at St Catharines getting warmer?
Yes: at St Catharines, the annual mean temperature rises by 0.22 °C per decade between 1961 and 2020, +1.3 °C in total. 6 of the 10 warmest years in the series fall after 1999.
Towns near this station
Neighbouring stations