The trend is colder by almost 2 degrees F for lowest minimum temperature over 129 years at KGRR.
This chart shows, like the charts for heating degree days or average temperature discussed earlier, the boat anchor for temperature which is 1943-1997. The anchor is heavy enough to keep the mean minimum since 1963 lower than before it, at -9F vs. -6F, despite all the recent warming.
Mean lowest minimum temperature:
1896-1943: -5F (48yrs)
1943-1997: -10F (55yrs)
1997-2024 to date: -5F (28yrs).
