BRIGANTINE, N.J. (AP) — The bitter cold temperatures in New Jersey have forced two more shore towns to postpone their polar bear plunges.

The fundraising event planned in Brigantine for New Year's Day will now be held Jan. 13, while the plunge in Margate was moved to Jan. 7.

The postponements come after two other nearby towns — Ocean City and Ventnor — canceled plunges that were also scheduled for Monday. Those events haven't been rescheduled and it's not clear if they will be held.

Officials in the four towns cited concerns about the safety of participants who would be jumping into the Atlantic Ocean. The forecast for Monday calls for a high of around 20 degrees while water temperatures likely will be in the mid-40s.

A polar bear plunge planned for Monday in Atlantic City is still due to take place.