HELENA, Mont. (AP) — Sub-zero temperatures and dangerous wind chill readings gripped north-central and north-eastern Montana at the beginning of 2018.

The National Weather Service reports Sidney recorded a temperature of minus 37 degrees (-38 Celsius) at 8 a.m. Monday. Havre, in north-central Montana, tied its record low for Jan. 1. at minus 32 degrees (-35 Celsius).

The wind chill index in the central Montana town of Jordan dipped as low as minus 58 (-50 Celsius) early Monday while Wolf Point was minus 56 and Glendive and Terry were minus 54. At those temperatures, exposed skin can suffer frostbite in 5 minutes.

Many other towns in northeastern Montana had wind chill readings between -42 and -47 Monday morning. The high temperature Monday in Malta and Harlem was forecast to be -15 (-26 Celsius).