Collinsville Post Office is a weather station located 196 m above sea level, 1 km from Collinsville. Its records go back to 1940: 40 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 23.8 °C; the 1961–1990 period is not documented well enough to compare. The warmest year of the series is 2016 (25.0 °C) and the coldest 1960 (22.2 °C). The last complete year, 2025, ranks 5 out of 40, from warmest to coldest. Over 1961–2025, the annual mean temperature changes by +0.21 °C per decade. The station ranks 98 out of 227 stations, from the fastest rise to the slowest.
Annual mean temperature since 1940
The first ten years of the series (1957–1987) average 23.0 °C; the last ten (2010–2025) average 24.1 °C, a difference of +1.1 °C. Of the ten warmest years in the series, 8 fall after 1999. The warmest is 2016 (25.0 °C). The ten-year running mean peaks at 24.3 °C (2025) and bottoms out at 22.9 °C (1965).
Annual rainfall since 1940
On average 690 mm of rain falls per year over the 77 documented years. The wettest year, 1956, received 1584 mm; the driest, 1982, only 299 mm, which is 5.3 times less. The 1991–2020 normal (657 mm per year) is 54 mm (9.0 %) above the 1961–1990 one (603 mm). Over 1991–2020, February is on average the wettest month (163 mm) and July the driest (13 mm). Between 2005 and 2025, 11 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 | – | 28.1 °C | – | 118 mm | 137 mm | +19 mm |
| February | – | 27.8 °C | – | 103 mm | 163 mm | +60 mm |
| March | – | 26.3 °C | – | 93 mm | 66 mm | −27 mm |
| April | – | 24.0 °C | – | 41 mm | 32 mm | −9 mm |
| May | – | 21.1 °C | – | 27 mm | 27 mm | 0 mm |
| June | – | 18.5 °C | – | 25 mm | 26 mm | +1 mm |
| July | – | 17.6 °C | – | 17 mm | 13 mm | −4 mm |
| August | – | 19.1 °C | – | 10 mm | 20 mm | +10 mm |
| September | – | 22.4 °C | – | 10 mm | 13 mm | +3 mm |
| October | – | 25.1 °C | – | 26 mm | 21 mm | −5 mm |
| November | – | 27.0 °C | – | 48 mm | 43 mm | −5 mm |
| December | – | 28.2 °C | – | 85 mm | 96 mm | +11 mm |
For rainfall, the largest difference is in February (+60 mm) and the smallest in March (−27 mm).
Records at Collinsville Post Office
- Warmest year: 25.0 °C, in 2016
- Coldest year: 22.2 °C, in 1960
- Driest year: 299 mm, in 1982
- Wettest year: 1584 mm, in 1956
- Warmest month: 30.6 °C, in December 2005
- Coldest month: 14.3 °C, in July 1965
- Wettest month: 525 mm, in February 1991
- Hottest day: 44.0 °C, on 6 January 1994
- Coldest day: −1.1 °C, on 14 August 1960
- Heaviest rain in one day: 266.2 mm, on 3 February 1991
2.8 °C separate the warmest year of the series from the coldest. Between the hottest and the coldest day on record, the range reaches 45.1 °C.
Temperature trend over 1961–2025
The regression line of annual mean temperature changes by +0.21 °C per decade between 1961 and 2025, about +1.3 °C over the whole period. That is faster than the median of the 227 stations (+0.19 °C per decade), by 0.02 °C per decade: the station ranks 98 out of 227.
The last 24 months against the 1991–2020 normal
Over the last 24 months (October 2024 to September 2026), 17 months out of 24 were warmer than the 1991–2020 normal for the same month; the mean departure is +0.5 °C. The highest departure was in November 2025 (+2.2 °C); the lowest, in February 2025 (−0.9 °C). The last twelve months add up to 800 mm of rain, which is 122 % of the 1991–2020 annual normal (657 mm).
| Month | Temperature | Departure from normal | Rain | Normal rain |
|---|---|---|---|---|
| October 2024 | 25.7 °C | +0.6 °C | 46 mm | 21 mm |
| November 2024 | 28.3 °C | +1.3 °C | 31 mm | 43 mm |
| December 2024 | 28.5 °C | +0.3 °C | 141 mm | 96 mm |
| January 2025 | 28.7 °C | +0.6 °C | 112 mm | 137 mm |
| February 2025 | 26.9 °C | −0.9 °C | 185 mm | 163 mm |
| March 2025 | 27.4 °C | +1.1 °C | 159 mm | 66 mm |
| April 2025 | 24.4 °C | +0.4 °C | 41 mm | 32 mm |
| May 2025 | 21.9 °C | +0.8 °C | 14 mm | 27 mm |
| June 2025 | 18.3 °C | −0.2 °C | 28 mm | 26 mm |
| July 2025 | 19.4 °C | +1.8 °C | 10 mm | 13 mm |
| August 2025 | 19.3 °C | +0.2 °C | 0 mm | 20 mm |
| September 2025 | 22.7 °C | +0.3 °C | 9 mm | 13 mm |
| October 2025 | 27.2 °C | +2.1 °C | 18 mm | 21 mm |
| November 2025 | 29.2 °C | +2.2 °C | 124 mm | 43 mm |
| December 2025 | 27.7 °C | −0.5 °C | 123 mm | 96 mm |
| January 2026 | 27.4 °C | −0.7 °C | 227 mm | 137 mm |
| February 2026 | 28.3 °C | +0.5 °C | 134 mm | 163 mm |
| March 2026 | 26.4 °C | +0.1 °C | 160 mm | 66 mm |
| April 2026 | 23.7 °C | −0.3 °C | 5 mm | 32 mm |
| May 2026 | 21.1 °C | 0.0 °C | 8 mm | 27 mm |
| June 2026 | 19.2 °C | +0.7 °C | 1 mm | 26 mm |
| July 2026 | 18.8 °C | +1.2 °C | 0 mm | 13 mm |
| August 2026 | 19.5 °C | +0.4 °C | 0 mm | 20 mm |
| September 2026 | 21.6 °C | −0.8 °C | 0 mm | 13 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 Collinsville 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 Collinsville Post Office?
Over 1991–2020, the annual mean temperature at Collinsville Post Office is 23.8 °C.
What is the warmest year ever measured at Collinsville Post Office?
Since records began in 1940, the warmest year at Collinsville Post Office is 2016, at 25.0 °C on average. The coldest is 1960 (22.2 °C).
Is the climate at Collinsville Post Office getting warmer?
Yes: at Collinsville Post Office, the annual mean temperature rises by 0.21 °C per decade between 1961 and 2025, +1.3 °C in total. 8 of the 10 warmest years in the series fall after 1999.
Towns near this station
Neighbouring stations