| Boissy-l'Aillerie | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Boissy-l'Aillerie (Val-d'Oise).svg |
| Coordinates: | 49.0792°N 2.0322°W |
| Arrondissement: | Pontoise |
| Canton: | Pontoise |
| Intercommunality: | Vexin Centre |
| Mayor: | Michel Guiard[1] |
| Term: | 2020 - 2026 |
| Elevation Min M: | 37 |
| Elevation Max M: | 99 |
| Area Km2: | 6.53 |
| Insee: | 95078 |
| Postal Code: | 95650 |
Boissy-l'Aillerie is a commune in the Val-d'Oise department in Île-de-France in northern France.
Pontoise – Cormeilles Aerodrome is located in the commune. At one time Aigle Azur's head office was on the grounds of the airport.[2]
Boissy-l'Aillerie has an oceanic climate (Köppen climate classification Cfb). The average annual temperature in Boissy-l'Aillerie is . The average annual rainfall is with December 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 Boissy-l'Aillerie was on 25 July 2019; the coldest temperature ever recorded was on 17 January 1985.
, the communal preschool (maternelle) had 65 students and the communal elementary school had 128 students.[3]