1. On December 3, 1850, Brigham Young was inaugurated as the first governor of the Utah Territory. He served until 1857, when he was replaced by a federally-appointed governor.

2. December 3, 1884, marks the birth of Alice Merrill Horne, a prominent politician and advocate for the arts in Utah. She served in the Utah State Legislature for 16 years and founded the Utah Arts Council.

3. In 1945, December 3 was designated as "AIDS Awareness Day" in Utah, aimed at raising awareness about the disease amongst the state's residents.

4. The Salt Lake City airport opened a new terminal on December 3, 2020, marking the beginning of a major renovation project aimed at updating and expanding the airport.

5. On December 3, 1969, David Archuleta, a popular singer and American Idol finalist, was born in Miami, Florida. However, he later moved to Utah and has since become a prominent figure in the state's music scene.