Osoyoos is a weather station located 283 m above sea level, 3 km from Osoyoos. Its records go back to 1955: 59 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 10.8 °C, practically the same as over 1961–1990 (10.7 °C). The warmest year of the series is 1994 (13.1 °C) and the coldest 1955 (8.8 °C). The last complete year, 2020, ranks 21 out of 59, from warmest to coldest. Over 1961–2020, the annual mean temperature changes by +0.02 °C per decade. The station ranks 238 out of 240 stations, from the fastest rise to the slowest.
Annual mean temperature since 1955
The first ten years of the series (1955–1964) average 10.5 °C; the last ten (2011–2020) average 10.8 °C, a difference of +0.3 °C. Of the ten warmest years in the series, 4 fall after 1999. The warmest is 1994 (13.1 °C). The ten-year running mean peaks at 11.2 °C (1996) and bottoms out at 10.3 °C (1978).
Annual rainfall since 1955
On average 322 mm of rain falls per year over the 46 documented years. The wettest year, 1998, received 504 mm; the driest, 1979, only 194 mm, which is 2.6 times less. Over 1961–1990, December is on average the wettest month (41 mm) and October the driest (16 mm). Between 1981 and 2008, 11 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 | −2.5 °C | −0.9 °C | +1.6 °C | 32 mm | – | – |
| February | 1.2 °C | 1.5 °C | +0.3 °C | 26 mm | – | – |
| March | 5.9 °C | 6.2 °C | +0.3 °C | 24 mm | – | – |
| April | 11.0 °C | 10.8 °C | −0.2 °C | 22 mm | – | – |
| May | 15.7 °C | 15.9 °C | +0.2 °C | 32 mm | – | – |
| June | 20.1 °C | 19.4 °C | −0.7 °C | 31 mm | – | – |
| July | 23.1 °C | 23.4 °C | +0.3 °C | 21 mm | – | – |
| August | 22.6 °C | 22.6 °C | 0.0 °C | 25 mm | – | – |
| September | 17.4 °C | 17.4 °C | 0.0 °C | 18 mm | – | – |
| October | 10.5 °C | 10.2 °C | −0.3 °C | 16 mm | – | – |
| November | 4.2 °C | 3.6 °C | −0.6 °C | 30 mm | – | – |
| December | −0.6 °C | −0.7 °C | −0.1 °C | 41 mm | – | – |
The largest temperature change is in January (+1.6 °C) and the smallest in June (−0.7 °C); over the year the mean difference is +0.1 °C, and 5 months out of twelve are warmer than before.
Records at Osoyoos
- Warmest year: 13.1 °C, in 1994
- Coldest year: 8.8 °C, in 1955
- Driest year: 194 mm, in 1979
- Wettest year: 504 mm, in 1998
- Warmest month: 26.4 °C, in July 1994
- Coldest month: −9.4 °C, in January 1979
- Wettest month: 109 mm, in May 1998
4.3 °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 +0.02 °C per decade between 1961 and 2020, about +0.1 °C over the whole period. That is slower than the median of the 240 stations (+0.25 °C per decade), by 0.23 °C per decade: the station ranks 238 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 Osoyoos 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 Osoyoos?
Over 1991–2020, the annual mean temperature at Osoyoos is 10.8 °C. It was 10.7 °C over 1961–1990, a difference of +0.1 °C.
What is the warmest year ever measured at Osoyoos?
Since records began in 1955, the warmest year at Osoyoos is 1994, at 13.1 °C on average. The coldest is 1955 (8.8 °C).
Is the climate at Osoyoos getting warmer?
The rise is not clear at Osoyoos: the trend is +0.02 °C per decade between 1961 and 2020, +0.1 °C in total over the period.
Towns near this station
Neighbouring stations