Houston is not immune from the cold freeze spreading across North America. According to CNN, more than 100 million people from Canada to Mexico are under wind chill warnings and advisories today.

For the Houston Metro area, the National Weather Service (NWS) reports that a hard freeze warning is in effect until 9 a.m. Wednesday. Wind chills dipped below 15 degrees in some areas early Tuesday morning, staying in the 20s throughout the day.

The NWS reports that Wednesday morning will be the coldest of the week and a hard freeze is expected in all areas except near the Gulf coast. The cold freeze is continuing since New Year’s Day, when news reports showed that 90 percent of U.S. states were showing temperatures of 32 degrees or less.

Houston police warned drivers of icy road conditions.

Roads are beginning to ice over near the interchange of IH-45 Gulf Freeway at the West Sam Houston Tollway South. Use caution in the area. CC4 #HouTraffic

— Houston Police (@houstonpolice) January 2, 2018

In normally balmy weather conditions, Dallas temperatures haven’t risen above freezing, and in Tennessee, the windchill is -6. (That’s better than Fargo, North Dakota, where wind chills plummeted to -28.)

Houston’s homeless are need of shelter, blankets, and warm clothes. The Star of Hope men’s shelter can help overnight roughly 305 people, with an additional 100 in extreme conditions. Its women’s shelter is helping 180 single women and 150 families.