Mount Gambier is a weather station located 63 m above sea level, 9 km from Mount Gambier. Its records go back to 1910: 116 years of temperature are available up to 2025, along with rainfall and a comparison with two reference normals. Over 1991–2020 the annual mean temperature there is 14.2 °C, noticeably higher than over 1961–1990 (13.9 °C): a difference of 0.3 °C. The warmest year of the series is 2007 (15.0 °C) and the coldest 1943 (12.2 °C). The last complete year, 2025, ranks 6 out of 116, from warmest to coldest. Over 1961–2025, the annual mean temperature changes by +0.13 °C per decade. The station ranks 183 out of 227 stations, from the fastest rise to the slowest.
Annual mean temperature since 1910
The first ten years of the series (1910–1919) average 13.7 °C; the last ten (2016–2025) average 14.4 °C, a difference of +0.6 °C. Of the ten warmest years in the series, 9 fall after 1999. The warmest is 2007 (15.0 °C). The ten-year running mean peaks at 14.5 °C (2018) and bottoms out at 12.8 °C (1949).
Annual rainfall since 1910
On average 715 mm of rain falls per year over the 83 documented years. The wettest year, 1947, received 971 mm; the driest, 1967, only 365 mm, which is 2.7 times less. The 1991–2020 normal (722 mm per year) is 36 mm (5.2 %) above the 1961–1990 one (686 mm). Over 1991–2020, August is on average the wettest month (100 mm) and February the driest (26 mm). Between 2005 and 2025, 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 | 18.4 °C | 19.0 °C | +0.6 °C | 25 mm | 31 mm | +6 mm |
| February | 18.9 °C | 19.3 °C | +0.4 °C | 18 mm | 26 mm | +8 mm |
| March | 17.3 °C | 17.4 °C | +0.1 °C | 36 mm | 35 mm | −1 mm |
| April | 14.8 °C | 14.7 °C | −0.1 °C | 52 mm | 50 mm | −2 mm |
| May | 12.1 °C | 12.2 °C | +0.1 °C | 68 mm | 74 mm | +6 mm |
| June | 10.0 °C | 10.2 °C | +0.2 °C | 81 mm | 91 mm | +10 mm |
| July | 9.3 °C | 9.7 °C | +0.4 °C | 101 mm | 99 mm | −2 mm |
| August | 10.0 °C | 10.3 °C | +0.3 °C | 91 mm | 100 mm | +9 mm |
| September | 11.4 °C | 11.6 °C | +0.2 °C | 71 mm | 76 mm | +5 mm |
| October | 12.9 °C | 13.3 °C | +0.4 °C | 59 mm | 54 mm | −5 mm |
| November | 14.8 °C | 15.4 °C | +0.6 °C | 46 mm | 46 mm | 0 mm |
| December | 16.6 °C | 17.2 °C | +0.6 °C | 38 mm | 40 mm | +2 mm |
The largest temperature change is in January (+0.6 °C) and the smallest in April (−0.1 °C); over the year the mean difference is +0.3 °C, and 11 months out of twelve are warmer than before. For rainfall, the largest difference is in June (+10 mm) and the smallest in October (−5 mm).
Records at Mount Gambier
- Warmest year: 15.0 °C, in 2007
- Coldest year: 12.2 °C, in 1943
- Driest year: 365 mm, in 1967
- Wettest year: 971 mm, in 1947
- Warmest month: 22.1 °C, in February 2000
- Coldest month: 7.1 °C, in August 1943
- Wettest month: 190 mm, in July 1964
- Hottest day: 45.9 °C, on 20 December 2019
- Coldest day: −4.1 °C, on 20 June 1950
- Heaviest rain in one day: 90.7 mm, on 18 February 1946
2.8 °C separate the warmest year of the series from the coldest. Between the hottest and the coldest day on record, the range reaches 50.0 °C.
Temperature trend over 1961–2025
The regression line of annual mean temperature changes by +0.13 °C per decade between 1961 and 2025, about +0.8 °C over the whole period. That is slower than the median of the 227 stations (+0.19 °C per decade), by 0.06 °C per decade: the station ranks 183 out of 227.
The last 24 months against the 1991–2020 normal
Over the last 24 months (October 2024 to September 2026), 10 months out of 15 were warmer than the 1991–2020 normal for the same month; the mean departure is +0.6 °C. The highest departure was in April 2025 (+2.2 °C); the lowest, in November 2025 (−2.0 °C). The last twelve months add up to 698 mm of rain, which is 97 % of the 1991–2020 annual normal (722 mm).
| Month | Temperature | Departure from normal | Rain | Normal rain |
|---|---|---|---|---|
| October 2024 | 13.9 °C | +0.6 °C | 29 mm | 54 mm |
| November 2024 | 16.8 °C | +1.4 °C | 35 mm | 46 mm |
| December 2024 | 18.3 °C | +1.1 °C | 70 mm | 40 mm |
| January 2025 | 20.6 °C | +1.6 °C | 11 mm | 31 mm |
| February 2025 | 20.4 °C | +1.1 °C | 6 mm | 26 mm |
| March 2025 | 19.4 °C | +2.0 °C | 15 mm | 35 mm |
| April 2025 | 16.9 °C | +2.2 °C | 33 mm | 50 mm |
| May 2025 | 12.7 °C | +0.5 °C | 40 mm | 74 mm |
| June 2025 | 9.9 °C | −0.3 °C | 130 mm | 91 mm |
| July 2025 | 9.7 °C | 0.0 °C | 113 mm | 99 mm |
| August 2025 | 10.5 °C | +0.2 °C | 109 mm | 100 mm |
| September 2025 | 12.2 °C | +0.6 °C | 75 mm | 76 mm |
| October 2025 | 13.3 °C | 0.0 °C | 67 mm | 54 mm |
| November 2025 | 13.4 °C | −2.0 °C | 88 mm | 46 mm |
| December 2025 | 16.9 °C | −0.3 °C | 35 mm | 40 mm |
| January 2026 | – | – | 4 mm | 31 mm |
| February 2026 | – | – | 23 mm | 26 mm |
| March 2026 | – | – | 48 mm | 35 mm |
| April 2026 | – | – | 36 mm | 50 mm |
| May 2026 | – | – | 81 mm | 74 mm |
| June 2026 | – | – | 120 mm | 91 mm |
| July 2026 | – | – | 104 mm | 99 mm |
| August 2026 | – | – | 65 mm | 100 mm |
| September 2026 | – | – | 27 mm | 76 mm |
Data source and licence
Data source: Bureau of Meteorology (ACORN-SAT) and NOAA NCEI (GHCN-Daily) (dataset “ACORN-SAT v2 daily (homogenised) + GHCN-Daily”), licence CC BY 4.0; Public domain (NOAA NCEI). Last updated: 29 October 2026.
The data for Mount Gambier 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 227 stations in Australia: the overview page lets you compare them.
Frequently asked questions
What is the annual mean temperature at Mount Gambier?
Over 1991–2020, the annual mean temperature at Mount Gambier is 14.2 °C. It was 13.9 °C over 1961–1990, a difference of +0.3 °C.
What is the warmest year ever measured at Mount Gambier?
Since records began in 1910, the warmest year at Mount Gambier is 2007, at 15.0 °C on average. The coldest is 1943 (12.2 °C).
Is the climate at Mount Gambier getting warmer?
Yes: at Mount Gambier, the annual mean temperature rises by 0.13 °C per decade between 1961 and 2025, +0.8 °C in total. 9 of the 10 warmest years in the series fall after 1999.
Towns near this station
Neighbouring stations