Temperatures were expected to fall from 50s Monday morning to the 30s in the evening before dropping to about 19 Tuesday morning.
After a warm weekend, Boulder should see a drop in temperatures this week, according to the National Weather Service.
A cold front will move through the area this afternoon, bringing the possibility of showers and storms, according to the National Weather Service.
Friday will continue very cold with sunny spells and showers of rain, sleet and snow. Thursday and Friday will be the coldest period of weather.
The cold snap and below average temperatures arrives in time for Santa and a tree lighting at 6:30 p.m. on Wednesday at the corner of West Third and Arch streets in Newberry. Chance of precipitation is 70%.
Today will start off as partly sunny and gradually become sunny with a high of 52.
Tuesday night, it will be mostly clear with a high of 30, according to the weather service, and a west wind of 6 to 13 miles per hour.
Thursday will be sunny, with a high in the low 40s, and the low Thursday night will be in the mid-20s.
Met Office forecaster Mark Wilson told the Metro: "The first low pressure area sees windy conditions for the whole of the United Kingdom on Wednesday into Thursday, with gusts approaching 55 miles per hour near south coasts and 60 miles per hour near west coasts".
Sky's weather forecaster Isobel Lang said: "This is a really interesting week of weather with some dramatic changes from Wednesday onwards".
Met Éireann has predicted that there will be snowfall in some parts of the country later this week as freezing temperature are expected to hit.