The overnight temperatures in Butler County shattered the previous record of 2 below zero, which was set in 1936.

Just after midnight, the thermometer at Butler County Airport read 8 below zero, and stayed there until dropping to 9 below at 3:15 a.m.

Just before 6 a.m., the temperature dipped again, to minus 15. The hour-by-hour readings at the airport were:

midnight — 8 below

1 a.m. — 8 below

2 a.m. — 8 below

3 a.m. — 9 below

4 a.m. — 9 below

5 a.m. — 11 below

6 a.m. — 15 below

7 a.m. — 15 below

8 a.m. — 11 below

Other, even lower temperatures were recorded around the county by the National Weather Service in Pittsburgh.

Near Portersville, a temperature of 25 below zero — and that was without a wind chill factor — was recorded. Additionally, 20 below zero was recorded near Connoquenessing, 19 below was recorded near Harmony and 18 below was recorded near Saxonburg.

The reading at Buffalo Elementary at 6:35 a.m. was minus 21.

Last winter’s lowest temperature was 11 below on Jan. 7.