Oni's average temperature over the last 30 years is around 10.2°C. Jul is typically the hottest month and Jan the coldest, with total annual rainfall averaging about 1299 mm.
| Year | Max Temp | Min Temp | Precipitation |
|---|---|---|---|
| 2025 | 34°C | -17°C | 1417 mm |
| 2024 | 32°C | -19°C | 1571 mm |
| 2023 | 34°C | -15°C | 1818 mm |
| 2022 | 34°C | -17°C | 1368 mm |
| 2021 | 32°C | -16°C | 1796 mm |
| 2020 | 33°C | -20°C | 1218 mm |
| 2019 | 33°C | -11°C | 1235 mm |
| 2018 | 33°C | -13°C | 1518 mm |
| 2017 | 34°C | -19°C | 1624 mm |
| 2016 | 31°C | -14°C | 1394 mm |
| 2015 | 34°C | -16°C | 1069 mm |
| 2014 | 33°C | -18°C | 1064 mm |
| 2013 | 29°C | -15°C | 1459 mm |
| 2012 | 31°C | -14°C | 1117 mm |
| 2011 | 35°C | -12°C | 1341 mm |
| 2010 | 33°C | -15°C | 1081 mm |
| 2009 | 30°C | -12°C | 1282 mm |
| 2008 | 31°C | -17°C | 1261 mm |
| 2007 | 31°C | -14°C | 1333 mm |
| 2006 | 34°C | -18°C | 1348 mm |
| 2005 | 31°C | -14°C | 1399 mm |
| 2004 | 29°C | -14°C | 1263 mm |
| 2003 | 30°C | -10°C | 1085 mm |
| 2002 | 30°C | -17°C | 1254 mm |
| 2001 | 33°C | -17°C | 1136 mm |
| 2000 | 35°C | -13°C | 956 mm |
| 1999 | 32°C | -11°C | 1259 mm |
| 1998 | 32°C | -13°C | 1036 mm |
| 1997 | 30°C | -13°C | 1241 mm |
| 1996 | 30°C | -14°C | 1079 mm |
| Month | Avg High | Avg Low | Rainfall |
|---|---|---|---|
| Jan | 3°C | -5°C | 95 mm |
| Feb | 4°C | -4°C | 98 mm |
| Mar | 7°C | -1°C | 131 mm |
| Apr | 13°C | 4°C | 115 mm |
| May | 18°C | 8°C | 130 mm |
| Jun | 23°C | 14°C | 141 mm |
| Jul | 26°C | 17°C | 112 mm |
| Aug | 26°C | 17°C | 66 mm |
| Sep | 21°C | 13°C | 95 mm |
| Oct | 16°C | 7°C | 110 mm |
| Nov | 10°C | 1°C | 103 mm |
| Dec | 6°C | -3°C | 103 mm |