Katanning Comparison is a weather station located 310 m above sea level, 0 km from Katanning. Its records go back to 1907: 96 years of temperature are available up to 2011, along with rainfall and a comparison with two reference normals. Closed series: the records of this station end in 2011. Over the whole series (96 years) the annual mean temperature there is 15.7 °C; the 1961–1990 and 1991–2020 reference periods are not documented well enough for a comparison. The warmest year of the series is 2003 (16.8 °C) and the coldest 1917 (14.7 °C). The last complete year, 2011, ranks 36 out of 96, from warmest to coldest. Over 1961–2011, the annual mean temperature changes by −0.01 °C per decade. The station ranks 226 out of 227 stations, from the fastest rise to the slowest.
Annual mean temperature since 1907
The first ten years of the series (1907–1916) average 15.7 °C; the last ten (1996–2011) average 15.9 °C, a difference of +0.2 °C. Of the ten warmest years in the series, 1 fall after 1999. The warmest is 2003 (16.8 °C). The ten-year running mean peaks at 16.1 °C (2003) and bottoms out at 15.5 °C (1925).
Annual rainfall since 1907
On average 483 mm of rain falls per year over the 105 documented years. The wettest year, 1955, received 782 mm; the driest, 1940, only 273 mm, which is 2.9 times less. The 1991–2020 normal (455 mm per year) is 37 mm (7.5 %) below the 1961–1990 one (492 mm). Over 1991–2020, June is on average the wettest month (69 mm) and February the driest (8 mm). Between 1992 and 2011, 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 | 22.1 °C | – | – | 21 mm | 20 mm | −1 mm |
| February | 22.0 °C | 22.0 °C | 0.0 °C | 22 mm | 8 mm | −14 mm |
| March | 20.0 °C | – | – | 17 mm | 22 mm | +5 mm |
| April | 16.6 °C | – | – | 34 mm | 28 mm | −6 mm |
| May | 13.3 °C | 13.8 °C | +0.5 °C | 57 mm | 51 mm | −6 mm |
| June | 11.1 °C | 11.1 °C | 0.0 °C | 82 mm | 69 mm | −13 mm |
| July | 10.1 °C | – | – | 74 mm | 67 mm | −7 mm |
| August | 10.4 °C | 10.7 °C | +0.3 °C | 64 mm | 63 mm | −1 mm |
| September | 11.9 °C | – | – | 45 mm | 49 mm | +4 mm |
| October | 14.3 °C | – | – | 37 mm | 30 mm | −7 mm |
| November | 17.5 °C | 17.9 °C | +0.4 °C | 27 mm | 27 mm | 0 mm |
| December | 20.5 °C | 20.3 °C | −0.2 °C | 12 mm | 21 mm | +9 mm |
For rainfall, the largest difference is in December (+9 mm) and the smallest in February (−14 mm).
Records at Katanning Comparison
- Warmest year: 16.8 °C, in 2003
- Coldest year: 14.7 °C, in 1917
- Driest year: 273 mm, in 1940
- Wettest year: 782 mm, in 1955
- Warmest month: 24.5 °C, in February 1985
- Coldest month: 8.4 °C, in June 1931
- Wettest month: 225 mm, in February 1955
- Hottest day: 44.6 °C, on 8 February 1933
- Coldest day: −3.0 °C, on 17 June 2006
- Heaviest rain in one day: 125.7 mm, on 17 February 1955
2.1 °C separate the warmest year of the series from the coldest. Between the hottest and the coldest day on record, the range reaches 47.6 °C.
Temperature trend over 1961–2011
The regression line of annual mean temperature changes by −0.01 °C per decade between 1961 and 2011, about −0.1 °C over the whole period. That is slower than the median of the 227 stations (+0.19 °C per decade), by 0.20 °C per decade: the station ranks 226 out of 227.
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 Katanning Comparison 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 Katanning Comparison?
Over the whole series (96 years), the annual mean temperature at Katanning Comparison is 15.7 °C.
What is the warmest year ever measured at Katanning Comparison?
Since records began in 1907, the warmest year at Katanning Comparison is 2003, at 16.8 °C on average. The coldest is 1917 (14.7 °C).
Is the climate at Katanning Comparison getting warmer?
The rise is not clear at Katanning Comparison: the trend is −0.01 °C per decade between 1961 and 2011, −0.1 °C in total over the period.
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