Boulia is a weather station located 162 m above sea level. Its records go back to 1887: 77 years of temperature are available up to 2021, along with rainfall and a comparison with two reference normals. Closed series: the records of this station end in 2021. Over the whole series (77 years) the annual mean temperature there is 23.8 °C; the 1961–1990 and 1991–2020 reference periods are not documented well enough for a comparison. The warmest year of the series is 2006 (26.4 °C) and the coldest 1917 (21.2 °C). The last complete year, 2011, ranks 41 out of 77, from warmest to coldest. Over 1961–2021, the annual mean temperature changes by +0.27 °C per decade. The station ranks 37 out of 227 stations, from the fastest rise to the slowest.
Annual mean temperature since 1887
The first ten years of the series (1910–1923) average 23.0 °C; the last ten (1993–2011) average 24.9 °C, a difference of +1.8 °C. Of the ten warmest years in the series, 2 fall after 1999. The warmest is 2006 (26.4 °C). The ten-year running mean peaks at 24.8 °C (1995) and bottoms out at 23.1 °C (1924).
Annual rainfall since 1887
On average 256 mm of rain falls per year over the 132 documented years. The wettest year, 1950, received 799 mm; the driest, 1905, only 24 mm, which is 33.3 times less. The 1991–2020 normal (251 mm per year) is 2 mm (0.8 %) below the 1961–1990 one (253 mm). Over 1991–2020, January is on average the wettest month (50 mm) and August the driest (3 mm). Between 2000 and 2021, 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 | 31.5 °C | 31.9 °C | +0.4 °C | 56 mm | 50 mm | −6 mm |
| February | 30.9 °C | 31.5 °C | +0.6 °C | 43 mm | 47 mm | +4 mm |
| March | 28.4 °C | 29.3 °C | +0.9 °C | 35 mm | 30 mm | −5 mm |
| April | 24.3 °C | 25.3 °C | +1.0 °C | 14 mm | 8 mm | −6 mm |
| May | 19.7 °C | – | – | 14 mm | 11 mm | −3 mm |
| June | 16.3 °C | 16.8 °C | +0.5 °C | 7 mm | 10 mm | +3 mm |
| July | 15.3 °C | 16.3 °C | +1.0 °C | 10 mm | 8 mm | −2 mm |
| August | 17.6 °C | 18.6 °C | +1.0 °C | 8 mm | 3 mm | −5 mm |
| September | 21.6 °C | 22.8 °C | +1.2 °C | 6 mm | 12 mm | +6 mm |
| October | 25.9 °C | – | – | 13 mm | 13 mm | 0 mm |
| November | 28.8 °C | – | – | 19 mm | 24 mm | +5 mm |
| December | 30.9 °C | – | – | 28 mm | 35 mm | +7 mm |
For rainfall, the largest difference is in December (+7 mm) and the smallest in January (−6 mm).
Records at Boulia
- Warmest year: 26.4 °C, in 2006
- Coldest year: 21.2 °C, in 1917
- Driest year: 24 mm, in 1905
- Wettest year: 799 mm, in 1950
- Warmest month: 34.9 °C, in February 1983
- Coldest month: 12.2 °C, in July 1957
- Wettest month: 465 mm, in January 1974
- Hottest day: 47.4 °C, on 25 December 2019
- Coldest day: −1.3 °C, on 29 July 1919
- Heaviest rain in one day: 209.0 mm, on 29 March 1894
5.2 °C separate the warmest year of the series from the coldest. Between the hottest and the coldest day on record, the range reaches 48.7 °C.
Temperature trend over 1961–2021
The regression line of annual mean temperature changes by +0.27 °C per decade between 1961 and 2021, about +1.6 °C over the whole period. That is faster than the median of the 227 stations (+0.19 °C per decade), by 0.08 °C per decade: the station ranks 37 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 Boulia 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 Boulia?
Over the whole series (77 years), the annual mean temperature at Boulia is 23.8 °C.
What is the warmest year ever measured at Boulia?
Since records began in 1887, the warmest year at Boulia is 2006, at 26.4 °C on average. The coldest is 1917 (21.2 °C).
Is the climate at Boulia getting warmer?
Yes: at Boulia, the annual mean temperature rises by 0.27 °C per decade between 1961 and 2021, +1.6 °C in total. 2 of the 10 warmest years in the series fall after 1999.
Neighbouring stations