MUMBAI: The city on Thursday recorded the season's lowest minimum temperature, 12.4 degrees Celsius, at the Santacruz weather observatory. It is the coldest December day since 2015, when the lowest minimum recorded was 11.4 degrees. The weather bureau has forecast that minimums will fall further on Friday.According to IMD, Santacruz's minimum temperature was 5.1 degrees below normal and was also over 5 degrees lower than Wednesday's minimum. Colaba recorded a minimum temperature of 17 degrees, which was 2.8 degrees below normal.In 2017 and 2016, the lowest minimum temperature in December was 15.2 and 15 degrees, respectively. In 2015, the lowest minimum was 11.4 degrees. The coldest-ever December day in the city was in 1949, when the Santacruz observatory recorded a minimum of 10.6 degrees.K S Hosalikar, deputy director general of meteorology, IMD Mumbai, said, "Lower level northerly and northwesterly winds from the Himalayan region over entire Maharashtra have resulted in a dip in temperatures. In the interior of the state, the minimum temperatures recorded were in the range of 10 to 15 degrees Celsius with a few stations reporting below 10 degrees too. The impact was also seen on coastal Maharashtra." The weather bureau has forecast cold wave conditions in isolated pockets of Nashik and Ahmednagar districts for three days.Maximums too remained below normal on Thursday. The IMD's Colaba observatory recorded 28.8 degrees Celsius, 1.9 degrees below normal. At the Santacruz observatory, the maximum was 30.8 degrees, 0.5 degrees below normal.