With winter storm Jonas over, the Butler region can anticipate warmer weather during the last week of January, according to the National Weather Service.

This week is expected to have temperatures in the 30s and maybe 40s, said Joe Palko, hydrologist with the National Weather Service’s Pittsburgh office. This is not too far out of the ordinary, with a string of higher temperatures at the end of the month termed the “January thaw,” Palko said.

This slight warming is due to air coming from the central states rather than colder air flowing down from Canada, Palko said. This also means there are no significant rain or snow storms expected through the end of January, he said.

“We’ve been bitter cold the past week, but now we’re on a gradual warming trend,” Palko said.

During the first three weeks of January, the average temperature for the Butler area was 24 degrees, which is 4 degrees below average, according to Palko.

While the first week of January was fairly warm, the middle of the month brought temperatures in the single digits or even below zero, Palko said.

In February, the temperature is again expected to drop, with the middle weeks of February projected to be colder than normal.

“It’s not over yet,” Palko said of the cold weather.