New Delhi: Parts of Delhi reeled under a "severe" cold wave and witnessed "dense" fog on Thursday as the minimum temperature dropped to 2 degrees Celsius, the India Meteorological Department (IMD) said.
Visibility levels dropped to 100 metres at Palam and 201 metres at Safdarjung due to "dense" to "moderate" fog in the morning, an IMD official said.
According to the IMD, "very dense" fog is when visibility is between 0 and 50 metres. In case of "dense" fog, visibility is between 51 and 200 metres, "moderate" 201 and 500 metres, and "shallow" 501 and 1,000 metres.
The Safdarjung Observatory, which provides representative data for the city, recorded a minimum of 2 degrees Celsius, five notches below normal, as against 3.2 degrees Celsius on Wednesday.
The weather stations at Lodhi Road and Ridge recorded a minimum of 2.4 and 3.6 degrees Celsius, respectively.