December is a good month at Gateway Arch — it ranks 9th of the twelve here. Expect about 80% fewer visitors than July, the park's peak — 93,014 visits on average. Days run around 45°F by afternoon and 27°F at night, with 9.5 hours of daylight.
December against the park's best
| Month | Verdict | Avg. visits | vs. peak | High | Low | Snow | Daylight |
|---|---|---|---|---|---|---|---|
| December (this page) | Good | 93,014 | −80% | 45°F | 27°F | 2.9" | 9.5 h |
| October (best) | Excellent | 125,733 | −74% | 70°F | 46°F | 0" | 11.1 h |
| July (peak crowds) | Tough | 476,195 | peak | 89°F | 69°F | 0" | 14.6 h |
Weather figures are for downtown St. Louis — the Cahokia station. Visits are 2021–2025 averages; climate normals cover 1991–2020. Conditions vary across the park; check current status before you go.
Common questions
Is December a good time to visit Gateway Arch?
It is a reasonable month — the park has stronger ones, but the records don't argue against it. December ranks 9 of 12 at Gateway Arch on crowds, weather, daylight, and access together.
How crowded is Gateway Arch in December?
About 93,014 recreation visits on average — 80% below July, the park's peak.
How warm is Gateway Arch in December?
Average highs around 45°F and lows around 27°F at the Cahokia station, with about 3 inches of snow across the month.
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