Grand Falls is a weather station located 103 m above sea level, 30 km from Grand Falls-Windsor. Its records go back to 1934: 67 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, slightly lower than over 1961–1990 (4.5 °C, a difference of 0.4 °C). The warmest year of the series is 1999 (6.5 °C) and the coldest 1939 (2.3 °C). The last complete year, 2020, ranks 15 out of 67, from warmest to coldest. Over 1961–2020, the annual mean temperature changes by −0.15 °C per decade. The station ranks 240 out of 240 stations, from the fastest rise to the slowest.
Annual mean temperature since 1934
The first ten years of the series (1934–1958) average 4.3 °C; the last ten (2010–2020) average 3.9 °C, a difference of −0.4 °C. Of the ten warmest years in the series, 1 fall after 1999. The warmest is 1999 (6.5 °C). The ten-year running mean peaks at 4.9 °C (1969) and bottoms out at 3.6 °C (2016).
Annual rainfall since 1934
On average 1173 mm of rain falls per year over the 50 documented years. The wettest year, 1984, received 1482 mm; the driest, 1959, only 885 mm, which is 1.7 times less. Over 1961–1990, January is on average the wettest month (121 mm) and May the driest (77 mm). Between 1980 and 2000, 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 | −7.2 °C | −7.8 °C | −0.6 °C | 121 mm | – | – |
| February | −7.7 °C | −8.2 °C | −0.5 °C | 110 mm | – | – |
| March | −3.5 °C | −4.5 °C | −1.0 °C | 111 mm | – | – |
| April | 2.1 °C | 1.5 °C | −0.6 °C | 89 mm | – | – |
| May | 7.7 °C | 7.2 °C | −0.5 °C | 77 mm | – | – |
| June | 12.9 °C | 12.3 °C | −0.6 °C | 88 mm | – | – |
| July | 17.5 °C | 16.9 °C | −0.6 °C | 81 mm | – | – |
| August | 16.6 °C | 16.4 °C | −0.2 °C | 106 mm | – | – |
| September | 11.8 °C | 11.8 °C | 0.0 °C | 85 mm | – | – |
| October | 6.4 °C | 6.3 °C | −0.1 °C | 105 mm | – | – |
| November | 1.9 °C | 1.4 °C | −0.5 °C | 102 mm | – | – |
| December | −4.0 °C | −3.7 °C | +0.3 °C | 113 mm | – | – |
The largest temperature change is in December (+0.3 °C) and the smallest in March (−1.0 °C); over the year the mean difference is −0.4 °C, and 1 months out of twelve are warmer than before.
Records at Grand Falls
- Warmest year: 6.5 °C, in 1999
- Coldest year: 2.3 °C, in 1939
- Driest year: 885 mm, in 1959
- Wettest year: 1482 mm, in 1984
- Warmest month: 21.2 °C, in July 1975
- Coldest month: −13.2 °C, in February 1994
- Wettest month: 238 mm, in October 2000
- Hottest day: 36.7 °C, on 12 August 2025
- Coldest day: −45.0 °C, on 4 February 1975
- Heaviest rain in one day: 153.3 mm, on 10 October 2016
4.2 °C separate the warmest year of the series from the coldest. Between the hottest and the coldest day on record, the range reaches 81.7 °C.
Temperature trend over 1961–2020
The regression line of annual mean temperature changes by −0.15 °C per decade between 1961 and 2020, about −0.9 °C over the whole period. That is slower than the median of the 240 stations (+0.25 °C per decade), by 0.40 °C per decade: the station ranks 240 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 Grand Falls 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 Grand Falls?
Over 1991–2020, the annual mean temperature at Grand Falls is 4.1 °C. It was 4.5 °C over 1961–1990, a difference of −0.4 °C.
What is the warmest year ever measured at Grand Falls?
Since records began in 1934, the warmest year at Grand Falls is 1999, at 6.5 °C on average. The coldest is 1939 (2.3 °C).
Is the climate at Grand Falls getting warmer?
The rise is not clear at Grand Falls: the trend is −0.15 °C per decade between 1961 and 2020, −0.9 °C in total over the period.
Towns near this station
Neighbouring stations