Winter weather is the time of year including the three coldest months, largely overlapped with the astronomical winter. In this sense the onset of winter weather vary depending, mainly, to the latitude. During the winter, people with allergies, may develop hypersensitivity to pollens, dusts and powders, you spend much time at home, and also some chemical components of some cleaning products can cause allergic crisis.
Kolkata has a semi arid climate with high variation between summer and winter. Summers are long, from early April to October, characterized by the monsoon season. Winters are characterized by the presence of a thick fog. Extreme temperatures range from 6 ° C to 42 ° C. The average annual temperature is 25 ° C; monthly average temperatures range from 14 ° C to 33 ° C.