 Also significant about that week in 2013 was how low temperatures fell and remained that way for several days with daytime highs failing to reach the freezing mark, and one night time low temperature of , recorded at the airport, was the coldest in the city in over 100 years.The rare, prolonged cold spell killed or severely damaged much of the area's non-native vegetation such as the Mexican/California Fan palm trees.the largest self-reported ancestry groups in St. George, Utah are