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Y bears the shortest place name in France, and one of theshortest in the world.[3] The inhabitants call themselvesYpsilonien(ne)s,[4] from the Greek letterUpsilon (Υ), which looks like the letter Y.
For 1971–2000, the mean annual temperature was 10.4°C, with an annual temperature range of 15.1°C. The average annual rainfall total is 709mm, with 11 days of precipitation in January and 8.7 days in July.[5] For 1991–2020, the average annual temperature observed at the nearest weather station, located in the municipality ofEstrées-Mons, 8 kilometers away pergreat-circle navigation,[7] is 11.0°C and the mean annual precipitation total is 647.5 mm.[8][9] For the future, the municipality's climate parameters estimate for 2050 according to differentgreenhouse gas emission scenarios can be consulted on a dedicated website published by Météo-France in November 2022.[10]
The village was caught up in the First World War. It was decorated by aCroix de guerre on 15 December 1920.[12] The Church of Saint-Médard was rebuilt in 1921 after the destruction caused by the First World War.[13]
Since 2002, the commune has been part of the community of communes of thePays Hamois, which succeeded thedistrict of Ham, created in 1960. Then on 1 January 2017, Pays Hamois and that of the Pays Neslois, merged.