The Chéran forms part of the commune's eastern border, crosses the village, flows north-northwestward through the northern part of the commune, then flows into the Fier, which forms part of its northern border. Rumilly forms an urban unit with the adjacent, smaller commune Sales.[4]
Climate
Rumilly has an oceanic climate (KöppenCfb) in spite of its relatively far inland position. Influenced by its elevation, summers are rather moderate on average, although they can be highly variable with extreme heat spikes. Winters see occasional freezing temperatures, but most often stays in the single-digits during daytime with frequent cold rain. Air frosts are normal during the night and snowfall is not uncommon.
Population
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