1. The first recorded snowfall in Maryland took place on December 13, 1819. The snowstorm deposited six inches of snow in Baltimore and is still remembered as one of the most significant snowfalls throughout Maryland's history.

2. On December 13, 1858, the Maryland General Assembly elected Thomas Holliday Hicks as governor. He was the first governor to be elected under the state's new constitution, which abolished slavery in Maryland.

3. On December 13, 1862, Confederate forces attacked the town of Frederick during the Civil War. The battle lasted for three days and resulted in significant damage to the town.

4. December 13, 1907, marked the opening of the Baltimore Museum of Art. The museum was initially established as an educational resource for the city's residents and featured works by local artists.

5. In 1955, the Maryland State Thoroughbred Racing Commission approved the construction of the Laurel Race Course on December 13. The course became a popular destination for horse racing enthusiasts and is still in operation today.