Waukesha experiences a continental climate with cold winters and warm summers. January is the coldest month, with temperatures ranging from -23°C to 5°C, while July and August are the warmest months, with temperatures averaging around 21-22°C. Spring arrives in March, bringing temperatures from -12°C to 18°C, and gradually warms up throughout April and May, with average highs reaching 13°C. Summer is pleasant, with June and July experiencing temperatures between 6-35°C, before cooling down slightly in August. Autumn brings mild temperatures, ranging from -1°C to 30°C, before the cold winter sets in again.