Athis-Mons () is a commune in the southern suburbs of Paris, France. It is located from the center of Paris.
Inhabitants are called Athégiens.
A small part of Orly International Airport lies on the territory of the commune of Athis-Mons, as do several of the hotels that serve the airport.
Athis-Mons was formed in 1817 by joining two villages, Athis (along the Seine, and formerly known as Athis-sur-Orge) and Mons (on the adjacent plateau). Nowadays the lower area of the commune is commonly called Athis-Val. The Hôtel de Ville was built as a private house in 1893.
During World War II, a significant portion (approximately 80%) of Athis-Mons was destroyed during the Allied bombing raid of 18 April 1944. Approximately 300 people died and 4,000 people were left homeless. Athis-Mons had to be entirely rebuilt after the war.
Athis-Mons is located at the confluence of Orge and Seine rivers, and at the southern edge of the international airport of Orly.
Athis-Mons has an oceanic climate (Köppen climate classification Cfb). The average annual temperature in Athis-Mons is . The average annual rainfall is with May as the wettest month. The temperatures are highest on average in July, at around , and lowest in January, at around . The highest temperature ever recorded in Athis-Mons was on 25 July 2019; the coldest temperature ever recorded was on 17 January 1985.
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The canton of Athis-Mons has 2 communes (the other is Paray-Vieille-Poste) and 36,615 inhabitants. Athis-Mons is a twin town of Ballina in Ireland.
Athis-Mons is served by Athis-Mons station on Paris RER line C.
The commune has nine preschools (écoles maternelles) and eight elementary schools (écoles élémentaires).
There is a private Catholic school, .
The city hosts the aviation museum Musée Delta.
Athis-Mons is twinned with:
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