Tromso's winter months, from January to March, are characterized by cold temperatures with frequent drops below -15°C, but occasional warm spells can bring temperatures up to 7-8°C. As spring arrives in April and May, the temperature range widens, and while it still gets chilly at night, daytime highs can reach up to 13-15°C. Summer months from June to August bring mild temperatures, with average highs around 20-22°C, but nighttime lows can still dip slightly below freezing. Autumn is cool and unpredictable, with temperatures fluctuating between -1°C and 18°C, and occasional cold snaps. Winters return in December, with temperatures mirroring those of January, marked by frequent subzero nights and mild days.