The USPTO will be closed on Monday, January 14, 2019 because of a dusting of snow. (OPM announcement.)
The small amount of snow giving rise to this closure would not even be noticed in other parts of the US such as the high altitudes of Colorado where Oppedahl Patent Law Firm LLC is located. (Oppedahl Patent Law Firm LLC will be open as usual on Monday, January 14, 2019.)
The closing of the USPTO means that any response that would be due on Monday, January 14, 2019 will be considered timely if it is filed by Tuesday, January 15, 2019.