India, Jan. 29 -- A moderate fog enveloped Delhi in the early hours of Thursday, reducing visibility to 200 metres at Palam, even as the minimum temperature of 11degC was three degrees above normal, and the air quality remained "poor". On Wednesday, Delhi recorded a minimum temperature of 12.6degC, compared to 8degC on Tuesday.

Fog and overcast skies tend to trap heat at night, raising the minimum temperature but dipping the maximum temperature.

The minimum temperature is expected to dip to 6degC by Saturday, as fog intensity reduces and strong northwesterly winds start blowing again. Light rain is likely on Sunday when a fresh western disturbance starts influencing the region, dipping the maximum temperature to between 17 and 19degC. ...