Missoula's winters are chilly, with temperatures often below freezing, especially in January and February when lows can drop as low as -21°C. Spring brings a slow warming trend, with March and April temperatures gradually increasing towards the mid-teens Celsius. Summer is warm but not hot, with July typically the warmest month, averaging around 22°C. Autumn is mild, with September and October temperatures similar to spring's, before cooling off again in November and December.