December is a good month at Lassen Volcanic — it ranks 11th of the twelve here. Expect about 94% fewer visitors than July, the park's peak — 6,677 visits on average. Days run around 40°F by afternoon and 22°F at night, with 9.3 hours of daylight.
December against the park's best
| Month | Verdict | Avg. visits | vs. peak | High | Low | Snow | Daylight |
|---|---|---|---|---|---|---|---|
| December (this page) | Good | 6,677 | −94% | 40°F | 22°F | — | 9.3 h |
| May (best) | Excellent | 33,897 | −69% | 61°F | 35°F | — | 14.4 h |
| July (peak crowds) | Good | 107,728 | peak | 79°F | 46°F | — | 14.8 h |
Weather figures are for the Manzanita Lake area (5,900 ft) — the Manzanita Lake 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 Lassen Volcanic?
It is a reasonable month — the park has stronger ones, but the records don't argue against it. December ranks 11 of 12 at Lassen Volcanic on crowds, weather, daylight, and access together.
How crowded is Lassen Volcanic in December?
About 6,677 recreation visits on average — 94% below July, the park's peak.
How warm is Lassen Volcanic in December?
Average highs around 40°F and lows around 22°F at the Manzanita Lake station.
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