Our overall weather pattern hasn't changed to much in the last few days, but you can see in the MesoWest temperature plot below that temperatures were in the high 70's a few days ago. The the senor was changed midday on April 9th (where the temperature spikes looks unreal). You can see the temperatures were high before noon, and then dropped after the sensor was changed. Now the temperatures agree with the surrounding stations.
The weather station at the airport (KSLC) is really close to the station at the National Weather Service Office (SLCBY).