Here are some key characteristics:

* Long, cold winters: Temperatures can drop below freezing for months, with average winter temperatures ranging from -54°C to -1°C (-65°F to 30°F).

* Short, cool summers: Summers are typically short, with average temperatures ranging from 10°C to 21°C (50°F to 70°F).

* Significant snowfall: Boreal forests receive heavy snowfall throughout the winter, which can accumulate to several feet deep.

* High humidity: The air in boreal forests is generally humid, especially during the summer months.

* Limited growing season: The short, cool summers limit the growing season for plants.

Overall, the climate of a boreal forest is characterized by extreme temperature fluctuations, heavy snowfall, and a short growing season.