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Renno has a warm-summer mediterranean climate (Köppen climate classificationCsb). The average annual temperature in Renno is 11.8 °C (53.2 °F). The average annual rainfall is 1,181.2 mm (46.50 in) with November as the wettest month. The temperatures are highest on average in August, at around 20.1 °C (68.2 °F), and lowest in January, at around 4.9 °C (40.8 °F). The highest temperature ever recorded in Renno was 38.3 °C (100.9 °F) on 19 July 2023 and 1 August 2017; the coldest temperature ever recorded was −9.4 °C (15.1 °F) on 11 February 2012.
Climate data for Renno (1991−2020 normals, extremes 1993−present)