Kwinana Bp Refinery is a weather station located 4 m above sea level, 2 km from Kwinana. Its records go back to 1956: 11 years of temperature are available up to 2010, along with rainfall and a comparison with two reference normals. Closed series: the records of this station end in 2010. Over the whole series (11 years) the annual mean temperature there is 18.3 °C; the 1961–1990 and 1991–2020 reference periods are not documented well enough for a comparison. The warmest year of the series is 1985 (19.2 °C) and the coldest 1960 (17.3 °C). The last complete year, 1985, ranks 1 out of 11, from warmest to coldest. Over 1961–2010, the annual mean temperature changes by +0.25 °C per decade. The station ranks 58 out of 227 stations, from the fastest rise to the slowest.
Annual mean temperature since 1956
The warmest years of the series all date from before 2000; the warmest is 1985 (19.2 °C). The ten-year running mean peaks at 18.3 °C (1967) and bottoms out at 18.2 °C (1968).
Annual rainfall since 1956
On average 736 mm of rain falls per year over the 49 documented years. The wettest year, 1974, received 1063 mm; the driest, 1977, only 435 mm, which is 2.4 times less. The 1991–2020 normal (659 mm per year) is 136 mm (17.1 %) below the 1961–1990 one (795 mm). Over 1961–1990, July is on average the wettest month (175 mm) and December the driest (9 mm). Between 1991 and 2010, 4 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 | – | – | – | 10 mm | 13 mm | +3 mm |
| February | 24.4 °C | – | – | 13 mm | 8 mm | −5 mm |
| March | 22.6 °C | – | – | 14 mm | 17 mm | +3 mm |
| April | – | – | – | 48 mm | 34 mm | −14 mm |
| May | 16.9 °C | – | – | 114 mm | 82 mm | −32 mm |
| June | – | – | – | 173 mm | 131 mm | −42 mm |
| July | – | – | – | 175 mm | 125 mm | −50 mm |
| August | 14.2 °C | – | – | 106 mm | 101 mm | −5 mm |
| September | 15.3 °C | – | – | 71 mm | 69 mm | −2 mm |
| October | 16.8 °C | – | – | 40 mm | 35 mm | −5 mm |
| November | – | – | – | 22 mm | 25 mm | +3 mm |
| December | – | – | – | 9 mm | – | – |
Records at Kwinana Bp Refinery
- Warmest year: 19.2 °C, in 1985
- Coldest year: 17.3 °C, in 1960
- Driest year: 435 mm, in 1977
- Wettest year: 1063 mm, in 1974
- Warmest month: 28.3 °C, in February 1985
- Coldest month: 12.1 °C, in July 1957
- Wettest month: 321 mm, in June 1964
- Hottest day: 43.2 °C, on 20 February 1977
- Coldest day: 0.8 °C, on 25 August 1997
- Heaviest rain in one day: 100.0 mm, on 29 July 1987
1.9 °C separate the warmest year of the series from the coldest. Between the hottest and the coldest day on record, the range reaches 42.4 °C.
Temperature trend over 1961–2010
The regression line of annual mean temperature changes by +0.25 °C per decade between 1961 and 2010, about +1.2 °C over the whole period. That is faster than the median of the 227 stations (+0.19 °C per decade), by 0.06 °C per decade: the station ranks 58 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 Kwinana Bp Refinery 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 Kwinana Bp Refinery?
Over the whole series (11 years), the annual mean temperature at Kwinana Bp Refinery is 18.3 °C.
What is the warmest year ever measured at Kwinana Bp Refinery?
Since records began in 1956, the warmest year at Kwinana Bp Refinery is 1985, at 19.2 °C on average. The coldest is 1960 (17.3 °C).
Is the climate at Kwinana Bp Refinery getting warmer?
Yes: at Kwinana Bp Refinery, the annual mean temperature rises by 0.25 °C per decade between 1961 and 2010, +1.2 °C in total.
Towns near this station
Neighbouring stations