Mean temperatures for January through mid-February are around -8 o Celsius, with the greatest amount of precipitation, much of it in the form of snow, falling during these months.
(Mean temperatures for January through mid-February; are; around -8) (much of it in the form of snow; falling; T:during these months)
Mean temperatures for January through mid-February much of it in the form of snow
are falling
around -8
T:during these months