Ouyen (Post Office) is a weather station located 50 m above sea level, 0 km from Ouyen. Its records go back to 1913: 58 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 17.1 °C, noticeably higher than over 1961–1990 (16.7 °C): a difference of 0.4 °C. The warmest year of the series is 2013 (17.9 °C) and the coldest 1974 (15.7 °C). The last complete year, 2024, ranks 7 out of 58, from warmest to coldest. Over 1961–2025, the annual mean temperature changes by +0.11 °C per decade. The station ranks 201 out of 227 stations, from the fastest rise to the slowest.
Annual mean temperature since 1913
The first ten years of the series (1957–1966) average 16.5 °C; the last ten (2007–2024) average 17.2 °C, a difference of +0.7 °C. Of the ten warmest years in the series, 5 fall after 1999. The warmest is 2013 (17.9 °C). The ten-year running mean peaks at 17.2 °C (2015) and bottoms out at 16.5 °C (1978).
Annual rainfall since 1913
On average 329 mm of rain falls per year over the 110 documented years. The wettest year, 1973, received 682 mm; the driest, 1967, only 110 mm, which is 6.2 times less. The 1991–2020 normal (312 mm per year) is 29 mm (8.5 %) below the 1961–1990 one (341 mm). Over 1991–2020, September is on average the wettest month (33 mm) and March the driest (13 mm). Between 2004 and 2025, 6 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 | 23.7 °C | 24.6 °C | +0.9 °C | 21 mm | 24 mm | +3 mm |
| February | 23.6 °C | 24.2 °C | +0.6 °C | 23 mm | 22 mm | −1 mm |
| March | 20.8 °C | 21.0 °C | +0.2 °C | 26 mm | 13 mm | −13 mm |
| April | 16.7 °C | 16.8 °C | +0.1 °C | 27 mm | 22 mm | −5 mm |
| May | 13.1 °C | 13.2 °C | +0.1 °C | 34 mm | 26 mm | −8 mm |
| June | 10.3 °C | 10.7 °C | +0.4 °C | 26 mm | 28 mm | +2 mm |
| July | 9.7 °C | 10.0 °C | +0.3 °C | 31 mm | 28 mm | −3 mm |
| August | 11.0 °C | 11.2 °C | +0.2 °C | 36 mm | 27 mm | −9 mm |
| September | 13.3 °C | 13.9 °C | +0.6 °C | 33 mm | 33 mm | 0 mm |
| October | 16.3 °C | 17.0 °C | +0.7 °C | 33 mm | 27 mm | −6 mm |
| November | 19.4 °C | 20.1 °C | +0.7 °C | 26 mm | 32 mm | +6 mm |
| December | 21.9 °C | 22.4 °C | +0.5 °C | 25 mm | 30 mm | +5 mm |
The largest temperature change is in January (+0.9 °C) and the smallest in May (+0.1 °C); over the year the mean difference is +0.4 °C, and 12 months out of twelve are warmer than before. For rainfall, the largest difference is in November (+6 mm) and the smallest in March (−13 mm).
Records at Ouyen (Post Office)
- Warmest year: 17.9 °C, in 2013
- Coldest year: 15.7 °C, in 1974
- Driest year: 110 mm, in 1967
- Wettest year: 682 mm, in 1973
- Warmest month: 27.5 °C, in February 1997
- Coldest month: 8.3 °C, in July 1982
- Wettest month: 183 mm, in February 1969
- Hottest day: 47.5 °C, on 8 January 2026
- Coldest day: −5.8 °C, on 17 July 1982
- Heaviest rain in one day: 92.6 mm, on 25 February 2026
2.2 °C separate the warmest year of the series from the coldest. Between the hottest and the coldest day on record, the range reaches 53.3 °C.
Temperature trend over 1961–2025
The regression line of annual mean temperature changes by +0.11 °C per decade between 1961 and 2025, about +0.7 °C over the whole period. That is slower than the median of the 227 stations (+0.19 °C per decade), by 0.08 °C per decade: the station ranks 201 out of 227.
The last 24 months against the 1991–2020 normal
Over the last 22 months (October 2024 to September 2026), 16 months out of 17 were warmer than the 1991–2020 normal for the same month; the mean departure is +1.3 °C. The highest departure was in April 2025 (+3.3 °C); the lowest, in March 2026 (−0.2 °C). The last twelve months add up to 474 mm of rain, which is 152 % of the 1991–2020 annual normal (312 mm).
| Month | Temperature | Departure from normal | Rain | Normal rain |
|---|---|---|---|---|
| October 2024 | 18.3 °C | +1.3 °C | 36 mm | 27 mm |
| December 2024 | 23.9 °C | +1.5 °C | 14 mm | 30 mm |
| January 2025 | 26.4 °C | +1.8 °C | 12 mm | 24 mm |
| February 2025 | – | – | 1 mm | 22 mm |
| March 2025 | 23.4 °C | +2.4 °C | 66 mm | 13 mm |
| April 2025 | 20.1 °C | +3.3 °C | 10 mm | 22 mm |
| May 2025 | – | – | 0 mm | 26 mm |
| June 2025 | – | – | 22 mm | 28 mm |
| July 2025 | 11.0 °C | +1.0 °C | 36 mm | 28 mm |
| August 2025 | 11.3 °C | +0.1 °C | 26 mm | 27 mm |
| September 2025 | – | – | 18 mm | 33 mm |
| October 2025 | 17.9 °C | +0.9 °C | 14 mm | 27 mm |
| December 2025 | 22.6 °C | +0.2 °C | 5 mm | 30 mm |
| January 2026 | 27.2 °C | +2.6 °C | 0 mm | 24 mm |
| February 2026 | 25.1 °C | +0.9 °C | 119 mm | 22 mm |
| March 2026 | 20.8 °C | −0.2 °C | 115 mm | 13 mm |
| April 2026 | 17.9 °C | +1.1 °C | 4 mm | 22 mm |
| May 2026 | 15.4 °C | +2.2 °C | 40 mm | 26 mm |
| June 2026 | 12.7 °C | +2.0 °C | 49 mm | 28 mm |
| July 2026 | – | – | 28 mm | 28 mm |
| August 2026 | 11.5 °C | +0.3 °C | 68 mm | 27 mm |
| September 2026 | 14.1 °C | +0.2 °C | 14 mm | 33 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 Ouyen (Post Office) 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 Ouyen (Post Office)?
Over 1991–2020, the annual mean temperature at Ouyen (Post Office) is 17.1 °C. It was 16.7 °C over 1961–1990, a difference of +0.4 °C.
What is the warmest year ever measured at Ouyen (Post Office)?
Since records began in 1913, the warmest year at Ouyen (Post Office) is 2013, at 17.9 °C on average. The coldest is 1974 (15.7 °C).
Is the climate at Ouyen (Post Office) getting warmer?
Yes: at Ouyen (Post Office), the annual mean temperature rises by 0.11 °C per decade between 1961 and 2025, +0.7 °C in total. 5 of the 10 warmest years in the series fall after 1999.
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