Boissy-l'Aillerie
# Boissy-l'Aillerie

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.

## Geography

### Climate

Boissy-l'Aillerie has a oceanic climate (Köppen climate classification Cfb). The average annual temperature in Boissy-l'Aillerie is 11.2 °C (52.2 °F). The average annual rainfall is 635.8 mm (25.03 in) with December as the wettest month. The temperatures are highest on average in July, at around 18.9 °C (66.0 °F), and lowest in January, at around 4.3 °C (39.7 °F). The highest temperature ever recorded in Boissy-l'Aillerie was 41.6 °C (106.9 °F) on 25 July 2019; the coldest temperature ever recorded was −17.8 °C (0.0 °F) on 17 January 1985.

Climate data for Boissy-l'Aillerie (Pontoise - Aero, altitude 87m, 1991–2020 normals, extremes 1946–present) :

| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Record high °C (°F) | 15.5 (59.9) | 20.0 (68.0) | 25.6 (78.1) | 29.3 (84.7) | 32.5 (90.5) | 37.1 (98.8) | 41.6 (106.9) | 39.2 (102.6) | 34.9 (94.8) | 28.8 (83.8) | 21.7 (71.1) | 17.4 (63.3) | 41.6 (106.9) |
| Average high °C (°F) | 7.0 (44.6) | 8.2 (46.8) | 12.0 (53.6) | 15.6 (60.1) | 19.0 (66.2) | 22.3 (72.1) | 24.9 (76.8) | 24.9 (76.8) | 21.0 (69.8) | 16.0 (60.8) | 10.7 (51.3) | 7.4 (45.3) | 15.8 (60.4) |
| Daily mean °C (°F) | 4.3 (39.7) | 4.8 (40.6) | 7.6 (45.7) | 10.2 (50.4) | 13.6 (56.5) | 16.7 (62.1) | 18.9 (66.0) | 18.8 (65.8) | 15.5 (59.9) | 11.9 (53.4) | 7.5 (45.5) | 4.7 (40.5) | 11.2 (52.2) |
| Average low °C (°F) | 1.6 (34.9) | 1.4 (34.5) | 3.2 (37.8) | 4.8 (40.6) | 8.2 (46.8) | 11.0 (51.8) | 12.9 (55.2) | 12.8 (55.0) | 10.0 (50.0) | 7.7 (45.9) | 4.4 (39.9) | 2.1 (35.8) | 6.7 (44.1) |
| Record low °C (°F) | −17.8 (0.0) | −15.4 (4.3) | −11.1 (12.0) | −4.6 (23.7) | −1.6 (29.1) | 1.0 (33.8) | 4.0 (39.2) | 3.1 (37.6) | −0.6 (30.9) | −5.2 (22.6) | −10.2 (13.6) | −16.0 (3.2) | −17.8 (0.0) |
| Average precipitation mm (inches) | 54.1 (2.13) | 45.9 (1.81) | 46.9 (1.85) | 43.9 (1.73) | 59.8 (2.35) | 50.2 (1.98) | 51.6 (2.03) | 55.4 (2.18) | 46.7 (1.84) | 58.2 (2.29) | 54.8 (2.16) | 68.3 (2.69) | 635.8 (25.03) |
| Average precipitation days (≥ 1.0 mm) | 10.8 | 9.4 | 9.0 | 9.0 | 9.5 | 8.9 | 8.1 | 7.9 | 7.9 | 10.3 | 10.5 | 11.9 | 113.1 |
| Source: Météo-France ||||||||||||||

## Education

As of 2015, the communal preschool (maternelle) had 65 students and the communal elementary school had 128 students.

