Springs and autumns are usually calm, although rapid weather changes can also be common during the two seasons. Winters can be very severe, with early-morning temperatures sometimes reaching as low as -20 °C. During the winter months, daily temperatures usually range between -10 °C and 10 °C. January is usually the coldest month, during which daily temperatures can stay below 0 °C for several days. Snowfall usually occurs between late October and early March. Fog can be a common early-morning occurrence between late summer and early spring, with all-day fog sometimes occurring during the coldest months.