Will I be cold?
Will I be cold in Tucson in December?
Verdict
Yes — Yes, cold.
Lows drop to 38°F on average — noticeably cold, especially after sundown. Big diurnal swing (25°F) — layers matter more than one warm coat.
Day vs. night
Day
63°F
Comfortable
A T-shirt and a light overshirt is enough.
Night
38°F
Cold
Cold enough that a hat and gloves become mandatory.
Why
Tucson in December averages highs of 63°F, lows of 38°F, 4 rainy days.
Plan for real winter kit — an insulated coat, warm hat, and gloves rather than a light jacket.
The day-to-night temperature swing is 25°F, which is the real story here — the average number hides how different midday and midnight feel.
Nearby months
Packing pointers
Best shoes
Boots & insulated picks for Tucson in December →