Coonabarabran (Namoi Street) is a weather station located 505 m above sea level, 1 km from Coonabarabran. Its records go back to 1880: 64 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 15.7 °C, slightly lower than over 1961–1990 (15.9 °C, a difference of 0.3 °C). The warmest year of the series is 2018 (17.7 °C) and the coldest 2001 (14.1 °C). The last complete year, 2025, ranks 11 out of 64, from warmest to coldest. Over 1961–2025, the annual mean temperature changes by +0.05 °C per decade. The station ranks 216 out of 227 stations, from the fastest rise to the slowest.
Annual mean temperature since 1880
The first ten years of the series (1957–1966) average 15.3 °C; the last ten (2013–2025) average 16.4 °C, a difference of +1.1 °C. Of the ten warmest years in the series, 3 fall after 1999. The warmest is 2018 (17.7 °C). The ten-year running mean peaks at 16.5 °C (2025) and bottoms out at 15.1 °C (2004).
Annual rainfall since 1880
On average 747 mm of rain falls per year over the 144 documented years. The wettest year, 1950, received 1530 mm; the driest, 2019, only 294 mm, which is 5.2 times less. The 1991–2020 normal (766 mm per year) is 46 mm (5.7 %) below the 1961–1990 one (812 mm). Over 1991–2020, December is on average the wettest month (95 mm) and April the driest (39 mm). Between 2004 and 2025, 8 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 | 23.5 °C | 23.9 °C | +0.4 °C | 131 mm | 91 mm | −40 mm |
| February | 23.2 °C | 22.9 °C | −0.3 °C | 73 mm | 83 mm | +10 mm |
| March | 20.5 °C | 19.8 °C | −0.7 °C | 69 mm | 64 mm | −5 mm |
| April | 16.1 °C | 15.5 °C | −0.6 °C | 55 mm | 39 mm | −16 mm |
| May | 12.0 °C | 11.5 °C | −0.5 °C | 64 mm | 45 mm | −19 mm |
| June | 8.9 °C | 8.7 °C | −0.2 °C | 44 mm | 55 mm | +11 mm |
| July | 7.9 °C | 7.7 °C | −0.2 °C | 53 mm | 56 mm | +3 mm |
| August | 9.2 °C | 8.9 °C | −0.3 °C | 59 mm | 42 mm | −17 mm |
| September | 12.3 °C | 12.4 °C | +0.1 °C | 52 mm | 57 mm | +5 mm |
| October | 16.2 °C | 15.8 °C | −0.4 °C | 73 mm | 60 mm | −13 mm |
| November | 19.2 °C | 19.3 °C | +0.1 °C | 69 mm | 79 mm | +10 mm |
| December | 22.3 °C | 21.8 °C | −0.5 °C | 70 mm | 95 mm | +25 mm |
The largest temperature change is in January (+0.4 °C) and the smallest in March (−0.7 °C); over the year the mean difference is −0.3 °C, and 3 months out of twelve are warmer than before. For rainfall, the largest difference is in December (+25 mm) and the smallest in January (−40 mm).
Records at Coonabarabran (Namoi Street)
- Warmest year: 17.7 °C, in 2018
- Coldest year: 14.1 °C, in 2001
- Driest year: 294 mm, in 2019
- Wettest year: 1530 mm, in 1950
- Warmest month: 28.8 °C, in January 2019
- Coldest month: 5.9 °C, in July 1957
- Wettest month: 365 mm, in January 1968
- Hottest day: 44.0 °C, on 3 January 2014
- Coldest day: −9.0 °C, on 12 July 2002
- Heaviest rain in one day: 176.3 mm, on 13 February 1898
3.6 °C separate the warmest year of the series from the coldest. Between the hottest and the coldest day on record, the range reaches 53.0 °C.
Temperature trend over 1961–2025
The regression line of annual mean temperature changes by +0.05 °C per decade between 1961 and 2025, about +0.3 °C over the whole period. That is slower than the median of the 227 stations (+0.19 °C per decade), by 0.14 °C per decade: the station ranks 216 out of 227.
The last 24 months against the 1991–2020 normal
Over the last 24 months (October 2024 to September 2026), 22 months out of 24 were warmer than the 1991–2020 normal for the same month; the mean departure is +1.3 °C. The highest departure was in March 2025 (+2.8 °C); the lowest, in June 2025 (−0.6 °C). The last twelve months add up to 501 mm of rain, which is 65 % of the 1991–2020 annual normal (766 mm).
| Month | Temperature | Departure from normal | Rain | Normal rain |
|---|---|---|---|---|
| October 2024 | 17.0 °C | +1.2 °C | 33 mm | 60 mm |
| November 2024 | 21.8 °C | +2.5 °C | 130 mm | 79 mm |
| December 2024 | 23.1 °C | +1.3 °C | 61 mm | 95 mm |
| January 2025 | 23.7 °C | −0.2 °C | 103 mm | 91 mm |
| February 2025 | 23.5 °C | +0.6 °C | 55 mm | 83 mm |
| March 2025 | 22.6 °C | +2.8 °C | 138 mm | 64 mm |
| April 2025 | 16.2 °C | +0.7 °C | 65 mm | 39 mm |
| May 2025 | 13.3 °C | +1.8 °C | 53 mm | 45 mm |
| June 2025 | 8.1 °C | −0.6 °C | 17 mm | 55 mm |
| July 2025 | 8.3 °C | +0.6 °C | 71 mm | 56 mm |
| August 2025 | 9.9 °C | +1.0 °C | 38 mm | 42 mm |
| September 2025 | 13.1 °C | +0.7 °C | 28 mm | 57 mm |
| October 2025 | 18.0 °C | +2.2 °C | 38 mm | 60 mm |
| November 2025 | 20.3 °C | +1.0 °C | 48 mm | 79 mm |
| December 2025 | 21.9 °C | +0.1 °C | 11 mm | 95 mm |
| January 2026 | 25.2 °C | +1.3 °C | 81 mm | 91 mm |
| February 2026 | 24.9 °C | +2.0 °C | 18 mm | 83 mm |
| March 2026 | 21.4 °C | +1.6 °C | 32 mm | 64 mm |
| April 2026 | 16.8 °C | +1.3 °C | 0 mm | 39 mm |
| May 2026 | 13.6 °C | +2.1 °C | 118 mm | 45 mm |
| June 2026 | 11.0 °C | +2.3 °C | 59 mm | 55 mm |
| July 2026 | 9.2 °C | +1.5 °C | 26 mm | 56 mm |
| August 2026 | 10.5 °C | +1.6 °C | 69 mm | 42 mm |
| September 2026 | 15.0 °C | +2.6 °C | 1 mm | 57 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 Coonabarabran (Namoi Street) 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 Coonabarabran (Namoi Street)?
Over 1991–2020, the annual mean temperature at Coonabarabran (Namoi Street) is 15.7 °C. It was 15.9 °C over 1961–1990, a difference of −0.3 °C.
What is the warmest year ever measured at Coonabarabran (Namoi Street)?
Since records began in 1880, the warmest year at Coonabarabran (Namoi Street) is 2018, at 17.7 °C on average. The coldest is 2001 (14.1 °C).
Is the climate at Coonabarabran (Namoi Street) getting warmer?
The rise is not clear at Coonabarabran (Namoi Street): the trend is +0.05 °C per decade between 1961 and 2025, +0.3 °C in total over the period.
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