St Margaret S Bay is a weather station located 17 m above sea level, 5 km from Stillwater Lake. 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 7.3 °C, much higher than over 1961–1990 (6.0 °C): a difference of 1.3 °C. The warmest year of the series is 1999 (8.4 °C) and the coldest 1963 (4.6 °C). The last complete year, 2020, ranks 4 out of 90, from warmest to coldest. Over 1961–2020, the annual mean temperature changes by +0.40 °C per decade. The station ranks 15 out of 240 stations, from the fastest rise to the slowest.
Annual mean temperature since 1923
The first ten years of the series (1923–1932) average 6.0 °C; the last ten (2004–2020) average 7.7 °C, a difference of +1.7 °C. Of the ten warmest years in the series, 7 fall after 1999. The warmest is 1999 (8.4 °C). The ten-year running mean peaks at 7.0 °C (2005) and bottoms out at 5.7 °C (1943).
Annual rainfall since 1923
On average 1442 mm of rain falls per year over the 87 documented years. The wettest year, 1967, received 1937 mm; the driest, 1930, only 1105 mm, which is 1.8 times less. The 1991–2020 normal (1495 mm per year) is 10 mm (0.7 %) above the 1961–1990 one (1485 mm). Over 1991–2020, December is on average the wettest month (161 mm) and August the driest (89 mm). Between 1991 and 2017, 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 | −5.6 °C | −4.8 °C | +0.8 °C | 154 mm | 144 mm | −10 mm |
| February | −5.8 °C | −4.2 °C | +1.6 °C | 129 mm | 125 mm | −4 mm |
| March | −1.2 °C | −0.7 °C | +0.5 °C | 130 mm | 142 mm | +12 mm |
| April | 3.9 °C | 4.7 °C | +0.8 °C | 115 mm | 110 mm | −5 mm |
| May | 9.1 °C | 10.1 °C | +1.0 °C | 112 mm | 122 mm | +10 mm |
| June | 13.9 °C | 14.9 °C | +1.0 °C | 104 mm | 101 mm | −3 mm |
| July | 17.3 °C | 18.7 °C | +1.4 °C | 105 mm | 94 mm | −11 mm |
| August | 17.2 °C | 19.1 °C | +1.9 °C | 101 mm | 89 mm | −12 mm |
| September | 13.5 °C | 15.5 °C | +2.0 °C | 97 mm | 122 mm | +25 mm |
| October | 8.3 °C | 9.6 °C | +1.3 °C | 123 mm | 134 mm | +11 mm |
| November | 3.7 °C | 4.8 °C | +1.1 °C | 150 mm | 151 mm | +1 mm |
| December | −2.4 °C | −0.5 °C | +1.9 °C | 165 mm | 161 mm | −4 mm |
The largest temperature change is in September (+2.0 °C) and the smallest in March (+0.5 °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 September (+25 mm) and the smallest in August (−12 mm).
Records at St Margaret S Bay
- Warmest year: 8.4 °C, in 1999
- Coldest year: 4.6 °C, in 1963
- Driest year: 1105 mm, in 1930
- Wettest year: 1937 mm, in 1967
- Warmest month: 22.4 °C, in August 2015
- Coldest month: −12.8 °C, in February 1923
- Wettest month: 402 mm, in January 1956
- Hottest day: 36.0 °C, on 27 June 2001
- Coldest day: −32.8 °C, on 19 January 1925
- Heaviest rain in one day: 147.0 mm, on 10 October 2005
3.8 °C separate the warmest year of the series from the coldest. Between the hottest and the coldest day on record, the range reaches 68.8 °C.
Temperature trend over 1961–2020
The regression line of annual mean temperature changes by +0.40 °C per decade between 1961 and 2020, about +2.4 °C over the whole period. That is faster than the median of the 240 stations (+0.25 °C per decade), by 0.15 °C per decade: the station ranks 15 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 Margaret S Bay 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 Margaret S Bay?
Over 1991–2020, the annual mean temperature at St Margaret S Bay is 7.3 °C. It was 6.0 °C over 1961–1990, a difference of +1.3 °C.
What is the warmest year ever measured at St Margaret S Bay?
Since records began in 1923, the warmest year at St Margaret S Bay is 1999, at 8.4 °C on average. The coldest is 1963 (4.6 °C).
Is the climate at St Margaret S Bay getting warmer?
Yes: at St Margaret S Bay, the annual mean temperature rises by 0.40 °C per decade between 1961 and 2020, +2.4 °C in total. 7 of the 10 warmest years in the series fall after 1999.
Towns near this station
Neighbouring stations