Pack or skip
Packable down jacket for Denver in December
Verdict
Pack it
Lows around 18°F — the packable puffer covers 90% of layering needs.
Why
Denver in December averages highs of 44°F, lows of 18°F, 6 rainy days.
That climate means a packable down jacket earns its space in the bag. Lows around 18°F — the packable puffer covers 90% of layering needs.