April is the most popular month to visit Back Bay, as it marks the peak season running from March through May. During this vibrant period, the area comes alive with blooming flowers and a variety of outdoor activities, making it an ideal time for travellers looking to explore the picturesque streets and beautiful parks. The pleasant spring temperatures, typically ranging from 5 to 15 degrees Celsius, provide a comfortable backdrop for sightseeing and leisurely strolls along the iconic Commonwealth Avenue.As the weather warms up, visitors can enjoy the charm of Back Bay, with its stunning Victorian architecture and nearby attractions like the Boston Public Library and the Prudential Centre. Plus, the blooming tulips in the parks create great photo opportunities.For those seeking a more budget-friendly option, consider visiting in December. While this month falls within the low season, Back Bay transforms into a winter wonderland, offering a great experience with festive decorations and a quieter atmosphere. Enjoying the holiday lights and seasonal events can be a delightful way to engage with the local culture.