ZIP code · Crystal Lake · Illinois · United States

ZIP code 60039 — Crystal Lake

ZIP code 60039 serves Crystal Lake, Illinois.

Postal code: 60039
Single source Value from one source, not cross-checked.
City: Crystal Lake
County: McHenry
State: Illinois
Country: United States
Coordinates: 42.3248, -88.4525 — precision precise (locality)
View on OpenStreetMap
USDA hardiness zone: 5b (-15 to -10 °F)
Planting / growing zone from the 2023 USDA Plant Hardiness Zone Map: average annual extreme minimum temperature, 1991–2020.
Time zone: America/Chicago (UTC−6 / UTC−5 DST)
Area codes: 815, 779
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 60039 with another ZIP · ZIPs within 25 miles · distance from 60039

Climate — monthly normals

Warmest month Jul (avg high 84°F), coldest Jan (avg low 14°F).

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high °F	32	35	47	59	71	80	84	82	74	62	48	36
Avg low °F	14	16	26	37	48	58	63	61	52	42	31	20
Precip in	2.0	1.8	2.5	3.8	5.0	5.3	3.9	3.8	3.5	3.2	2.5	2.1

NOAA 1991–2020 climate normals from the nearest station: CRYSTAL LAKE 4NW (5.3 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