Not just for a specific day, but for the entire month.
1 Nov 2019 – The month of October was the coldest on record for the Montana city, according to the National Weather Service.
“The average temperature for the month was 38.2 degrees,” said Senior Meteorologist Bob Nester. “The record before that was in 2009 when the average temperature was 39.7 degrees, so we broke the record by a degree and a half.”
“The monthly average temperature was six and a half degrees below normal,” said Nester, “so to break a record like that is pretty significant because those records date back to 1948.”
Thanks to Argiris Diamantis for this link