我直觉是一月底二月初，于是现搜了一下：

January is typically the coldest month in Quebec, with average temperatures ranging from -6°C to -15°C. In Quebec City, the average temperature in January is -27°C (-16.6°F). 

Quebec winters are characterized by cold, snowy days, and temperatures that stay below 0°C for long periods of time. Snow often falls in December and stays until late March. January can also bring a few serious snowstorms, which can lead to school closures and snow removal operations."