Lebanon Real Estate for Sale Browse real estate for sale in Lebanon CT. Contact HST at 860-456-7653 or online with any questions or to schedule a private showing. Our CT realtors are ready to help you! Lebanon, Connecticut was founded over 300 years ago and is famously known as the "Heartbeat of the Revolution." It is also 55.4 square miles of land, one of Connecticut's largest towns. In Lebanon, the highest monthly average temperature for July is 72 degrees and the lowest monthly average temperature for February is 29 degrees. The air quality index is also approximately 33% better than the national average! The average school test scores in Lebanon are about 34% higher than the national average, with a high school graduation rate of 93.1%!