Thetford Mines is a weather station located 430 m above sea level, 6 km from Thetford-Mines. Its records go back to 1923: 90 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 3.6 °C, much higher than over 1961–1990 (2.3 °C): a difference of 1.3 °C. The warmest year of the series is 2012 (5.0 °C) and the coldest 1976 (−0.1 °C). The last complete year, 2020, ranks 4 out of 90, from warmest to coldest. Over 1961–2020, the annual mean temperature changes by +0.46 °C per decade. The station ranks 6 out of 240 stations, from the fastest rise to the slowest.
Annual mean temperature since 1923
The first ten years of the series (1923–1934) average 1.4 °C; the last ten (2011–2020) average 3.9 °C, a difference of +2.5 °C. Of the ten warmest years in the series, 9 fall after 1999. The warmest is 2012 (5.0 °C). The ten-year running mean peaks at 4.0 °C (2017) and bottoms out at 1.0 °C (1943).
Annual rainfall since 1923
On average 1345 mm of rain falls per year over the 84 documented years. The wettest year, 1976, received 1779 mm; the driest, 1948, only 899 mm, which is 2.0 times less. The 1991–2020 normal (1451 mm per year) is 74 mm (5.4 %) above the 1961–1990 one (1377 mm). Over 1991–2020, July is on average the wettest month (146 mm) and November the driest (100 mm). Between 1994 and 2015, 15 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 | −13.8 °C | −12.2 °C | +1.6 °C | 108 mm | 116 mm | +8 mm |
| February | −12.4 °C | −10.9 °C | +1.5 °C | 91 mm | 112 mm | +21 mm |
| March | −6.1 °C | −5.2 °C | +0.9 °C | 104 mm | 112 mm | +8 mm |
| April | 1.5 °C | 2.4 °C | +0.9 °C | 92 mm | 104 mm | +12 mm |
| May | 9.1 °C | 10.1 °C | +1.0 °C | 106 mm | 117 mm | +11 mm |
| June | 14.0 °C | 15.1 °C | +1.1 °C | 118 mm | 137 mm | +19 mm |
| July | 16.7 °C | 17.6 °C | +0.9 °C | 122 mm | 146 mm | +24 mm |
| August | 15.4 °C | 16.7 °C | +1.3 °C | 159 mm | 128 mm | −31 mm |
| September | 10.7 °C | 12.5 °C | +1.8 °C | 123 mm | 114 mm | −9 mm |
| October | 4.8 °C | 5.7 °C | +0.9 °C | 102 mm | 126 mm | +24 mm |
| November | −2.3 °C | −1.0 °C | +1.3 °C | 118 mm | 100 mm | −18 mm |
| December | −10.5 °C | −8.0 °C | +2.5 °C | 134 mm | 139 mm | +5 mm |
The largest temperature change is in December (+2.5 °C) and the smallest in March (+0.9 °C); over the year the mean difference is +1.3 °C, and 12 months out of twelve are warmer than before. For rainfall, the largest difference is in July (+24 mm) and the smallest in August (−31 mm).
Records at Thetford Mines
- Warmest year: 5.0 °C, in 2012
- Coldest year: −0.1 °C, in 1976
- Driest year: 899 mm, in 1948
- Wettest year: 1779 mm, in 1976
- Warmest month: 19.6 °C, in July 2020
- Coldest month: −19.7 °C, in February 1934
- Wettest month: 310 mm, in June 1922
5.1 °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 +0.46 °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 0.21 °C per decade: the station ranks 6 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 Thetford Mines 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 Thetford Mines?
Over 1991–2020, the annual mean temperature at Thetford Mines is 3.6 °C. It was 2.3 °C over 1961–1990, a difference of +1.3 °C.
What is the warmest year ever measured at Thetford Mines?
Since records began in 1923, the warmest year at Thetford Mines is 2012, at 5.0 °C on average. The coldest is 1976 (−0.1 °C).
Is the climate at Thetford Mines getting warmer?
Yes: at Thetford Mines, the annual mean temperature rises by 0.46 °C per decade between 1961 and 2020, +2.7 °C in total. 9 of the 10 warmest years in the series fall after 1999.
Towns near this station
Neighbouring stations