Toronto Intl A is a weather station located 173 m above sea level, 6 km from Etobicoke. Its records go back to 1938: 82 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 8.9 °C, much higher than over 1961–1990 (7.5 °C): a difference of 1.5 °C. The warmest year of the series is 2012 (10.8 °C) and the coldest 1940 (6.0 °C). The last complete year, 2020, ranks 4 out of 82, from warmest to coldest. Over 1961–2020, the annual mean temperature changes by +0.45 °C per decade. The station ranks 8 out of 240 stations, from the fastest rise to the slowest.
Annual mean temperature since 1938
The first ten years of the series (1938–1948) average 7.4 °C; the last ten (2011–2020) average 9.3 °C, a difference of +1.9 °C. Of the ten warmest years in the series, 8 fall after 1999. The warmest is 2012 (10.8 °C). The ten-year running mean peaks at 9.3 °C (2007) and bottoms out at 7.1 °C (1972).
Monthly normals: 1961–1990 against 1991–2020
The table compares, month by month, the mean temperature and the rainfall total of two thirty-year reference periods. The difference column shows what the recent period changes compared with the earlier one.
| Month | Temp. 1961–1990 | Temp. 1991–2020 | Difference | Rain 1961–1990 | Rain 1991–2020 | Difference |
|---|---|---|---|---|---|---|
| January | −6.4 °C | −4.7 °C | +1.7 °C | – | – | – |
| February | −5.8 °C | −4.0 °C | +1.8 °C | – | – | – |
| March | −0.6 °C | 0.7 °C | +1.3 °C | – | – | – |
| April | 6.3 °C | 7.1 °C | +0.8 °C | – | – | – |
| May | 12.6 °C | 13.9 °C | +1.3 °C | – | – | – |
| June | 17.7 °C | 19.4 °C | +1.7 °C | – | – | – |
| July | 20.8 °C | 22.3 °C | +1.5 °C | – | – | – |
| August | 19.8 °C | 21.4 °C | +1.6 °C | – | – | – |
| September | 15.6 °C | 17.3 °C | +1.7 °C | – | – | – |
| October | 9.3 °C | 10.5 °C | +1.2 °C | – | – | – |
| November | 3.5 °C | 4.3 °C | +0.8 °C | – | – | – |
| December | −3.2 °C | −1.1 °C | +2.1 °C | – | – | – |
The largest temperature change is in December (+2.1 °C) and the smallest in April (+0.8 °C); over the year the mean difference is +1.5 °C, and 12 months out of twelve are warmer than before.
Records at Toronto Intl A
- Warmest year: 10.8 °C, in 2012
- Coldest year: 6.0 °C, in 1940
- Warmest month: 25.1 °C, in July 2020
- Coldest month: −12.2 °C, in February 2015
4.8 °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 +0.45 °C per decade between 1961 and 2020, about +2.7 °C over the whole period. That is faster than the median of the 240 stations (+0.25 °C per decade), by 0.20 °C per decade: the station ranks 8 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 Toronto Intl A 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 Toronto Intl A?
Over 1991–2020, the annual mean temperature at Toronto Intl A is 8.9 °C. It was 7.5 °C over 1961–1990, a difference of +1.5 °C.
What is the warmest year ever measured at Toronto Intl A?
Since records began in 1938, the warmest year at Toronto Intl A is 2012, at 10.8 °C on average. The coldest is 1940 (6.0 °C).
Is the climate at Toronto Intl A getting warmer?
Yes: at Toronto Intl A, the annual mean temperature rises by 0.45 °C per decade between 1961 and 2020, +2.7 °C in total. 8 of the 10 warmest years in the series fall after 1999.
Towns near this station
Neighbouring stations