For the year to date (Jan–Nov), our mean statewide temperature is 53.7ºF, the highest in the instrumented record.
Data from NCDC suggests that in December 1934 the statewide average temperature was 1.1ºF above the 1981–2010 statewide average temperature. I don't have access to statewide statistics for the first 12 days of this December, but we can look at anomalies at specific stations. At Salt Lake City we ran 7.6ºF above the 1981–2010 average. At Cedar City we ran 8.0ºF above the 1981–2010 average. Now that's a fever!
Thus, we head into the last half of December with a very real chance of recording the warmest calendar year in Utah during the instrumented record. That sounds impressive, but in the coming decades, this year won't seem all that unusual.