St Jerome is a weather station located 170 m above sea level, 4 km from Saint-Jérôme. Its records go back to 1933: 75 years of temperature are available up to 2019, along with rainfall and a comparison with two reference normals. Closed series: the records of this station end in 2019. Over 1991–2020 the annual mean temperature there is 5.6 °C, clearly higher than over 1961–1990 (4.8 °C): a difference of 0.8 °C. The warmest year of the series is 2005 (7.9 °C) and the coldest 1944 (3.0 °C). The last complete year, 2019, ranks 60 out of 75, from warmest to coldest. Over 1961–2019, the annual mean temperature changes by +0.32 °C per decade. The station ranks 48 out of 240 stations, from the fastest rise to the slowest.
Annual mean temperature since 1933
The first ten years of the series (1933–1943) average 4.3 °C; the last ten (2004–2019) average 5.9 °C, a difference of +1.6 °C. Of the ten warmest years in the series, 5 fall after 1999. The warmest is 2005 (7.9 °C). The ten-year running mean peaks at 6.3 °C (2007) and bottoms out at 4.2 °C (1948).
Annual rainfall since 1933
On average 1140 mm of rain falls per year over the 72 documented years. The wettest year, 1993, received 1421 mm; the driest, 1948, only 845 mm, which is 1.7 times less. The 1991–2020 normal (1190 mm per year) is 41 mm (3.6 %) above the 1961–1990 one (1149 mm). Over 1991–2020, July is on average the wettest month (123 mm) and February the driest (68 mm). Between 1991 and 2010, 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 | −11.9 °C | −11.0 °C | +0.9 °C | 89 mm | 101 mm | +12 mm |
| February | −10.3 °C | −9.1 °C | +1.2 °C | 80 mm | 68 mm | −12 mm |
| March | −3.8 °C | −3.2 °C | +0.6 °C | 73 mm | 75 mm | +2 mm |
| April | 4.5 °C | 5.0 °C | +0.5 °C | 77 mm | 87 mm | +10 mm |
| May | 12.0 °C | 12.6 °C | +0.6 °C | 88 mm | 92 mm | +4 mm |
| June | 17.0 °C | 17.8 °C | +0.8 °C | 113 mm | 118 mm | +5 mm |
| July | 19.8 °C | 20.3 °C | +0.5 °C | 107 mm | 123 mm | +16 mm |
| August | 18.2 °C | 19.1 °C | +0.9 °C | 114 mm | 113 mm | −1 mm |
| September | 13.2 °C | 14.5 °C | +1.3 °C | 97 mm | 116 mm | +19 mm |
| October | 7.1 °C | 7.5 °C | +0.4 °C | 95 mm | 103 mm | +8 mm |
| November | 0.1 °C | 0.5 °C | +0.4 °C | 103 mm | 95 mm | −8 mm |
| December | −8.6 °C | −6.8 °C | +1.8 °C | 113 mm | 99 mm | −14 mm |
The largest temperature change is in December (+1.8 °C) and the smallest in November (+0.4 °C); over the year the mean difference is +0.8 °C, and 12 months out of twelve are warmer than before. For rainfall, the largest difference is in September (+19 mm) and the smallest in December (−14 mm).
Records at St Jerome
- Warmest year: 7.9 °C, in 2005
- Coldest year: 3.0 °C, in 1944
- Driest year: 845 mm, in 1948
- Wettest year: 1421 mm, in 1993
- Warmest month: 22.7 °C, in July 1955
- Coldest month: −19.1 °C, in February 1934
- Wettest month: 309 mm, in July 1996
- Hottest day: 35.6 °C, on 28 June 1933
- Coldest day: −41.7 °C, on 15 January 1957
- Heaviest rain in one day: 103.6 mm, on 15 June 1943
4.9 °C separate the warmest year of the series from the coldest. Between the hottest and the coldest day on record, the range reaches 77.3 °C.
Temperature trend over 1961–2019
The regression line of annual mean temperature changes by +0.32 °C per decade between 1961 and 2019, about +1.9 °C over the whole period. That is faster than the median of the 240 stations (+0.25 °C per decade), by 0.07 °C per decade: the station ranks 48 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 Jerome 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 Jerome?
Over 1991–2020, the annual mean temperature at St Jerome is 5.6 °C. It was 4.8 °C over 1961–1990, a difference of +0.8 °C.
What is the warmest year ever measured at St Jerome?
Since records began in 1933, the warmest year at St Jerome is 2005, at 7.9 °C on average. The coldest is 1944 (3.0 °C).
Is the climate at St Jerome getting warmer?
Yes: at St Jerome, the annual mean temperature rises by 0.32 °C per decade between 1961 and 2019, +1.9 °C in total. 5 of the 10 warmest years in the series fall after 1999.
Towns near this station
Neighbouring stations