Waterloo's winters are extremely cold, with temperatures often dropping below -20°C in January and February. The coldest months also see significant variability in temperature, with some days still experiencing lows around -30°C. As the seasons transition into spring, temperatures gradually warm up, reaching averages above 10°C by April and May. Summer is relatively mild, with June and July averaging highs around 25-26°C, but can be quite variable, with occasional drops below -20°C in July and August. In autumn, temperatures cool down again, returning to average lows around 0-5°C by October and November.