ZIP code · New Haven · Connecticut · United States

ZIP code 06503 — New Haven

ZIP code 06503 serves New Haven, Connecticut.

Postal code: 06503
Single source Value from one source, not cross-checked.
City: New Haven
County: South Central Regional
State: Connecticut
Country: United States
Coordinates: 41.3082, -72.9282 — precision precise (locality)
View on OpenStreetMap
USDA hardiness zone: 7a (0 to 5 °F)
Planting / growing zone from the 2023 USDA Plant Hardiness Zone Map: average annual extreme minimum temperature, 1991–2020.
Time zone: America/New_York (UTC−5 / UTC−4 DST)
Area codes: 203, 475
Telephone area codes serving this ZIP (NANPA central-office assignments). A ZIP and an area code are different boundaries; at a border both codes may apply.

Tools: compare 06503 with another ZIP · ZIPs within 25 miles · distance from 06503

Climate — monthly normals

Warmest month Jul (avg high 82°F), coldest Jan (avg low 23°F).

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high °F	38	40	47	58	68	76	82	81	75	64	53	44
Avg low °F	23	24	30	39	49	59	66	65	57	46	36	29
Precip in	2.7	2.8	3.7	4.2	3.5	3.5	3.4	3.5	4.0	3.8	3.1	3.5

NOAA 1991–2020 climate normals from the nearest station: NEW HAVEN TWEED AP (3.7 mi) · NOAA NCEI

About this page

US ZIP codes have five digits. They are postal routing areas, not administrative boundaries: a ZIP can span more than one city or county, and the city shown is the primary USPS name for that code.

GeoNames · NOAA NCEI · usda-phzm. Data generated on 2026-08-21. Methodology · Report an error on this page