It seems like for the past couple weeks inversions have been mostly pretty strong in Fairbanks-land, stronger than normal anyway. So I've been toying with an easy way to quantify that.
Here's an attempt that uses the daily difference in standardized mean daily temperature anomaly for Fairbanks International Airport and Keystone Ridge. This accounts for the "normal inversion" as reflected in the daily means and adjusts for variance (the standardized part) that differs between hills and valleys (valleys have significantly larger variations in temperature). This differences is the relative inversion strength (RIS). I've plotted the daily anomalies for both sites in the background for reference.