(CNN)As temperatures plunge across the country, staying indoors and warm is not always an option for the nation's homeless.
The National Weather Service warns that hypothermia can occur in temperatures even as high as 60 degrees Fahrenheit, especially if the person isn't properly dressed.
Here are some ways you can help those in need:
Direct them to shelters
Homeless populations are particularly vulnerable since they have significantly fewer places to take refuge from the weather and less ways to protect themselves outside.
"Anything under 40 degrees Fahrenheit is considered cold," Kevin Hall, program director for the Salvation Army in Atlanta, told CNN.
"On the norm, we check the weather around 4 p.m. and if it's going to be cold, we let people in our shelters know to be prepared."
Hand out care packages
Nancy Powers with the Salvation Army's Chicago Freedom Center suggests keeping care packages in your car to give to the homeless, especially people who refuse to go to shelters.