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Boissy-l'Aillerie
Boissy-l'Aillerie
Commune
	The town hall in Boissy-l'Aillerie
	Coat of arms
	Location of Boissy-l'Aillerie
	Boissy-l'Aillerie Boissy-l'Aillerie
	Coordinates: 49°04′45″N 2°01′56″E / 49.0792°N 2.0322°E
Country	France
Region	Île-de-France
Department	Val-d'Oise
Arrondissement	Pontoise
Canton	Pontoise
Intercommunality	Vexin Centre
Government
• Mayor (2020–2026)	Michel Guiard
Area 1	6.53 km2 (2.52 sq mi)
Population (2021)	2,024
• Density	310/km2 (800/sq mi)
Time zone	UTC+01:00 (CET)
• Summer (DST)	UTC+02:00 (CEST)
INSEE/Postal code	95078 /95650
Elevation	37–99 m (121–325 ft)
	1 French Land Register data, which excludes lakes, ponds, glaciers > 1 km2 (0.386 sq mi or 247 acres) and river estuaries.

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.^[3]^[4]

Geography

Climate

Boissy-l'Aillerie has an 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)
Mean daily maximum °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)
Mean daily minimum °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^[5]