Donnacona is a weather station located 61 m above sea level, 6 km from Saint-Marc-des-Carrières. Its records go back to 1919: 84 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 4.1 °C, clearly higher than over 1961–1990 (3.0 °C): a difference of 1.1 °C. The warmest year of the series is 2010 (6.2 °C) and the coldest 1972 (0.5 °C). The last complete year, 2020, ranks 6 out of 84, from warmest to coldest. Over 1961–2020, the annual mean temperature changes by +0.44 °C per decade. The station ranks 10 out of 240 stations, from the fastest rise to the slowest.
Annual mean temperature since 1919
The first ten years of the series (1919–1928) average 3.0 °C; the last ten (2011–2020) average 4.5 °C, a difference of +1.6 °C. Of the ten warmest years in the series, 7 fall after 1999. The warmest is 2010 (6.2 °C). The ten-year running mean peaks at 4.7 °C (2018) and bottoms out at 2.2 °C (1980).
Annual rainfall since 1919
On average 1211 mm of rain falls per year over the 69 documented years. The wettest year, 1983, received 1526 mm; the driest, 1956, only 879 mm, which is 1.7 times less. Over 1961–1990, August is on average the wettest month (120 mm) and February the driest (76 mm). Between 1984 and 2006, 12 years out of 20 exceeded the series average.
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 | −13.9 °C | −12.7 °C | +1.2 °C | 88 mm | – | – |
| February | −12.4 °C | −10.9 °C | +1.5 °C | 76 mm | – | – |
| March | −5.4 °C | −4.7 °C | +0.7 °C | 78 mm | – | – |
| April | 2.7 °C | 3.3 °C | +0.6 °C | 76 mm | – | – |
| May | 9.8 °C | 10.9 °C | +1.1 °C | 107 mm | – | – |
| June | 15.0 °C | 15.9 °C | +0.9 °C | 109 mm | – | – |
| July | 17.6 °C | 18.7 °C | +1.1 °C | 117 mm | – | – |
| August | 16.3 °C | 17.6 °C | +1.3 °C | 120 mm | – | – |
| September | 11.5 °C | 13.0 °C | +1.5 °C | 116 mm | – | – |
| October | 5.8 °C | 6.5 °C | +0.7 °C | 98 mm | – | – |
| November | −1.2 °C | −0.2 °C | +1.0 °C | 102 mm | – | – |
| December | −9.8 °C | −7.7 °C | +2.1 °C | 107 mm | – | – |
The largest temperature change is in December (+2.1 °C) and the smallest in April (+0.6 °C); over the year the mean difference is +1.1 °C, and 12 months out of twelve are warmer than before.
Records at Donnacona
- Warmest year: 6.2 °C, in 2010
- Coldest year: 0.5 °C, in 1972
- Driest year: 879 mm, in 1956
- Wettest year: 1526 mm, in 1983
- Warmest month: 21.4 °C, in July 1921
- Coldest month: −20.3 °C, in February 1934
- Wettest month: 317 mm, in August 1938
5.7 °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 +0.44 °C per decade between 1961 and 2020, about +2.6 °C over the whole period. That is faster than the median of the 240 stations (+0.25 °C per decade), by 0.19 °C per decade: the station ranks 10 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 Donnacona 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 Donnacona?
Over 1991–2020, the annual mean temperature at Donnacona is 4.1 °C. It was 3.0 °C over 1961–1990, a difference of +1.1 °C.
What is the warmest year ever measured at Donnacona?
Since records began in 1919, the warmest year at Donnacona is 2010, at 6.2 °C on average. The coldest is 1972 (0.5 °C).
Is the climate at Donnacona getting warmer?
Yes: at Donnacona, the annual mean temperature rises by 0.44 °C per decade between 1961 and 2020, +2.6 °C in total. 7 of the 10 warmest years in the series fall after 1999.
Towns near this station
Neighbouring stations