Another cold spell, likely to be the season’s last, is set to grip Calcutta from Monday, the Met office has said.

The first few days of February were unusually cold in Calcutta. The spell was broken by a cyclonic circulation over central India that had led to moisture incursion into the atmosphere, stalling the flow of cold winds from north and triggering a rise in temperature.

The moisture incursion led to the formation of clouds and the city saw a spell of rain late on Saturday. The Met office at Alipore recorded only 1.5mm of rain.

Some areas, however, saw more than a drizzle.

But the sky cleared on Sunday morning and is expected to remain so over the next few days.

“The cyclonic circulation over Chhattisgarh has become much less marked. It is going to dissipate by Sunday. After a fresh bout of snowfall in Kashmir, the cold north-westerly winds are set to enter Calcutta,” said a Met official.

The effect of the winds was felt from Sunday night. “The minimum temperature is likely to be under 15 degrees for the next few days. If the winds are strong, the Celsius can slide to around 13 degrees,” the official said.

The mornings in the city are, however, likely to be foggy.

The cold winds will start losing steam from the middle of February, the official said.

The Celsius in Calcutta had been consistently under 13 degrees in the first week of February, several notches below the usual temperature for this time of the year.

At 11.4 degrees, Monday (February 1) was the coldest February day in over a decade and the second coldest this winter.

The low day temperature was the main reason behind the slide in mercury.

The maximum temperature was in the range of 22 and 23 degrees for a few days, a whopping seven-degree deviation from the usual (29 degrees) for February.