ZIP code · Flinthill · Missouri · United States
ZIP code 63346 — Flinthill
ZIP code 63346 serves Flinthill, Missouri.
- Postal code
- 63346Single source Value from one source, not cross-checked.
- City
- Flinthill
- County
- Saint Charles
- State
- Missouri
- Country
- United States
- Coordinates
- 38.7509, -90.5368 — precision estimated (postal-area centroid)
View on OpenStreetMap - USDA hardiness zone
- 6b (-5 to 0 °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 code
- 636 (from the nearest rate centre)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 63346 with another ZIP · ZIPs within 25 miles · distance from 63346
Climate — monthly normals
Warmest month Jul (avg high 88°F), coldest Jan (avg low 21°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 39 | 45 | 56 | 67 | 76 | 84 | 88 | 87 | 81 | 69 | 55 | 44 |
| Avg low °F | 21 | 25 | 33 | 43 | 54 | 63 | 68 | 65 | 57 | 45 | 35 | 27 |
| Precip in | 2.4 | 2.4 | 3.5 | 4.7 | 4.8 | 4.3 | 4.2 | 3.8 | 3.1 | 3.1 | 3.5 | 2.6 |
NOAA 1991–2020 climate normals from the nearest station: ST PETERS 2 SE (3.0 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