From the Spaceflight Meteorology Group:
An extended period of well below average temperatures is forecast for JSC over the next 5 to 7 days. JSC is likely to set several daily records for minimum temperature and coldest maximum temperature Saturday through Tuesday. JSC may tie or break its all-time record low of 20°F as well on Tuesday morning. JSC records have been kept since 2000. The temperature should drop below freezing for 3 to 7 hours Monday morning and again Monday night for up to 16+ hours into Tuesday. Take precautions for exposed or vulnerable pipes, plants and pets.
There is also a very good chance for freezing rain, sleet or snow early to mid-morning on Monday at JSC. Winds will be breezy as well making for low wind chills and miserable weather on Monday.
Another update will follow on Friday.