New Year's eve may be one of the warmest in 20 years in Kolkata 
This article discusses the possibility of the highest minimum temperature on New Year's eve in the last two decades in Kolkata. The met office indicated that the minimum temperature is unlikely to significantly change from the 17.6°C recorded on Wednesday. The warm easterly winds prevailing over the city are likely to stay strong until the first week of January, keeping the minimum temperature over four degrees above normal. A cyclonic circulation off the coast of Bangladesh is injecting moisture into Kolkata, producing morning fog and higher temperatures. The maximum temperature is also likely to remain up to two notches above normal.