Lao Cai experiences a distinct seasonal pattern with temperatures gradually warming up from winter. In the coldest months of January and December, temperatures range from around 0-25°C, while spring in March and April brings highs near 30-35°C. Summer months from May to August are hot, with temperatures often reaching 37-38°C, but evenings still cool down significantly. Autumn sees a slight drop in temperature, with November being the coolest month of the season. Winter returns by December, marking the beginning of another cycle of gradual warming up.