Mount Barker is a weather station located 360 m above sea level, 2 km from Mount Barker. Its records go back to 1885: 49 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 14.8 °C, clearly higher than over 1961–1990 (14.0 °C): a difference of 0.8 °C. The warmest year of the series is 2007 (15.6 °C) and the coldest 1958 (13.1 °C). The last complete year, 2025, ranks 3 out of 49, from warmest to coldest. Over 1961–2025, the annual mean temperature changes by +0.24 °C per decade. The station ranks 67 out of 227 stations, from the fastest rise to the slowest.
Annual mean temperature since 1885
The first ten years of the series (1957–1968) average 13.7 °C; the last ten (2005–2025) average 15.0 °C, a difference of +1.3 °C. Of the ten warmest years in the series, 9 fall after 1999. The warmest is 2007 (15.6 °C). The ten-year running mean peaks at 14.9 °C (2009) and bottoms out at 13.7 °C (1972).
Annual rainfall since 1885
On average 757 mm of rain falls per year over the 121 documented years. The wettest year, 1917, received 1294 mm; the driest, 1967, only 382 mm, which is 3.4 times less. The 1991–2020 normal (735 mm per year) is 20 mm (2.8 %) above the 1961–1990 one (715 mm). Over 1991–2020, July is on average the wettest month (113 mm) and January the driest (23 mm). Between 2002 and 2025, 9 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 | 19.5 °C | 20.4 °C | +0.9 °C | 25 mm | 23 mm | −2 mm |
| February | 19.4 °C | 20.2 °C | +0.8 °C | 24 mm | 26 mm | +2 mm |
| March | 17.4 °C | 18.1 °C | +0.7 °C | 31 mm | 27 mm | −4 mm |
| April | 14.4 °C | 15.1 °C | +0.7 °C | 66 mm | 48 mm | −18 mm |
| May | 11.6 °C | 12.3 °C | +0.7 °C | 74 mm | 75 mm | +1 mm |
| June | 9.5 °C | 10.1 °C | +0.6 °C | 79 mm | 101 mm | +22 mm |
| July | 8.8 °C | 9.5 °C | +0.7 °C | 106 mm | 113 mm | +7 mm |
| August | 9.5 °C | 10.1 °C | +0.6 °C | 99 mm | 103 mm | +4 mm |
| September | 11.1 °C | 12.0 °C | +0.9 °C | 75 mm | 88 mm | +13 mm |
| October | 13.3 °C | 14.1 °C | +0.8 °C | 65 mm | 52 mm | −13 mm |
| November | 15.7 °C | 16.7 °C | +1.0 °C | 35 mm | 39 mm | +4 mm |
| December | 17.8 °C | 18.5 °C | +0.7 °C | 36 mm | 40 mm | +4 mm |
The largest temperature change is in November (+1.0 °C) and the smallest in June (+0.6 °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 June (+22 mm) and the smallest in April (−18 mm).
Records at Mount Barker
- Warmest year: 15.6 °C, in 2007
- Coldest year: 13.1 °C, in 1958
- Driest year: 382 mm, in 1967
- Wettest year: 1294 mm, in 1917
- Warmest month: 23.4 °C, in January 2001
- Coldest month: 6.8 °C, in July 1957
- Wettest month: 271 mm, in May 1923
- Hottest day: 44.5 °C, on 28 January 2009
- Coldest day: −5.6 °C, on 10 July 1959
- Heaviest rain in one day: 129.8 mm, on 10 April 1970
2.5 °C separate the warmest year of the series from the coldest. Between the hottest and the coldest day on record, the range reaches 50.1 °C.
Temperature trend over 1961–2025
The regression line of annual mean temperature changes by +0.24 °C per decade between 1961 and 2025, about +1.5 °C over the whole period. That is faster than the median of the 227 stations (+0.19 °C per decade), by 0.05 °C per decade: the station ranks 67 out of 227.
The last 24 months against the 1991–2020 normal
Over the last 22 months (November 2024 to September 2026), 19 months out of 21 were warmer than the 1991–2020 normal for the same month; the mean departure is +0.9 °C. The highest departure was in March 2025 (+2.8 °C); the lowest, in November 2025 (−1.9 °C). The last twelve months add up to 713 mm of rain, which is 97 % of the 1991–2020 annual normal (735 mm).
| Month | Temperature | Departure from normal | Rain | Normal rain |
|---|---|---|---|---|
| November 2024 | 17.7 °C | +1.0 °C | 31 mm | 39 mm |
| December 2024 | 21.1 °C | +2.6 °C | 34 mm | 40 mm |
| January 2025 | 21.6 °C | +1.2 °C | 6 mm | 23 mm |
| February 2025 | 22.1 °C | +1.9 °C | 1 mm | 26 mm |
| March 2025 | 20.9 °C | +2.8 °C | 9 mm | 27 mm |
| May 2025 | 12.8 °C | +0.5 °C | 48 mm | 75 mm |
| June 2025 | 10.3 °C | +0.2 °C | 137 mm | 101 mm |
| July 2025 | 9.5 °C | 0.0 °C | 170 mm | 113 mm |
| August 2025 | 10.3 °C | +0.2 °C | 104 mm | 103 mm |
| September 2025 | 12.7 °C | +0.7 °C | 34 mm | 88 mm |
| October 2025 | 14.8 °C | +0.7 °C | 71 mm | 52 mm |
| November 2025 | 14.8 °C | −1.9 °C | 71 mm | 39 mm |
| December 2025 | 18.8 °C | +0.3 °C | 8 mm | 40 mm |
| January 2026 | 22.5 °C | +2.1 °C | 1 mm | 23 mm |
| February 2026 | 20.7 °C | +0.5 °C | 6 mm | 26 mm |
| March 2026 | 18.3 °C | +0.2 °C | 47 mm | 27 mm |
| April 2026 | – | – | 44 mm | 48 mm |
| May 2026 | 13.9 °C | +1.6 °C | 60 mm | 75 mm |
| June 2026 | 11.1 °C | +1.0 °C | 122 mm | 101 mm |
| July 2026 | 10.0 °C | +0.5 °C | 134 mm | 113 mm |
| August 2026 | 11.2 °C | +1.1 °C | 132 mm | 103 mm |
| September 2026 | 13.7 °C | +1.7 °C | 17 mm | 88 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 Barker 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 Barker?
Over 1991–2020, the annual mean temperature at Mount Barker is 14.8 °C. It was 14.0 °C over 1961–1990, a difference of +0.8 °C.
What is the warmest year ever measured at Mount Barker?
Since records began in 1885, the warmest year at Mount Barker is 2007, at 15.6 °C on average. The coldest is 1958 (13.1 °C).
Is the climate at Mount Barker getting warmer?
Yes: at Mount Barker, the annual mean temperature rises by 0.24 °C per decade between 1961 and 2025, +1.5 °C in total. 9 of the 10 warmest years in the series fall after 1999.
Towns near this station
Neighbouring stations