Pack or skip
Packable down jacket for Ljubljana in December
Verdict
Pack it
Lows around 28°F — the packable puffer covers 90% of layering needs.
Why
Ljubljana in December averages highs of 37°F, lows of 28°F, 9 rainy days.
That climate means a packable down jacket earns its space in the bag. Lows around 28°F — the packable puffer covers 90% of layering needs.