THE Big Freeze returned to the region as officials, schools, emergency services and residents dealt with freezing conditions.
Anglesey Council is concerned over levels of road grit over the festive period.
A council spokesman confirmed that it had 800 tonnes of grit left with more expected this week.
However, he added: “We are concerned about the depleting levels and with the Christmas holiday period approaching it will be harder to replenish grit stocks.”
Anglesey Council uses around 50 tonnes of grit on each run, with up to three runs a night in freezing conditions.
The spokesman added that there was a possibility that North Wales councils might share stocks.
A Gwynedd Council spokesman said that freezing temperatures meant that grit had not worked effectively.
Main roads remained open and work will be carried out over the next few days to plough the smaller roads and lanes.
He added: "The Council appreciates the inconvenience that the situation has caused people, and is grateful for the public’s patience as we work to improve the situation."
44 of the island's 66 schools closed early for Christmas on Monday due to the wintry conditions.
66 Gwynedd schools were forced to shut.
Waste and recycling services across Anglesey and Arfon were cancelled on Monday due to the weather.
A Betsi Cadwaladr University Health Board spokesman said that Ysbyty Gwynedd's A&E department dealt with an increase in patients suffering from conditions worsened by the cold, and trips, slips and falls.
He added: “As a Health Board, we would like to thank all the staff who have shown tremendous commitment to ensure that the patients get the treatment that they need.”
He also thanked members of the public who used 18 4X4 vehicles to transport staff to work.
Normal service at the councils' headquarters resumed today after staff were forced to leave early on Friday.
Irish Ferries' and Stenaline's services from Holyhead Port have not been affected by the weather (Monday).