Karlstad's winters are long and cold, with temperatures often below freezing, but occasional warm spells bring temperatures above zero. As spring arrives in March, temperatures slowly rise, and by April, the average temperature is already around 4°C. Summer months of May to August are mild and pleasant, with July being the warmest month, averaging 19°C. Autumn brings a return to cooler temperatures, but still relatively mild compared to winter, with occasional warmer days in September. Winters then close the year, with temperatures similar to those at the start, with cold snaps and brief periods of warmth.