The Southeastern New England AVA is a narrow band of coastal land stretching from just south of Boston, through Rhode Island, and as far westward as New London, CT. The appellation also includes all the coastal islands, among them Martha’s Vineyard, which has its own sub-AVA designation. The coastal nature of the entire AVA is ensured by its boundaries, which never venture more than 15 miles inland from the shore. Thus, the maritime influences of Long Island Sound, Cape Cod and Massachusetts Bay are always primary. The ocean moderates seasonal extremes, giving average daily temperatures of 30 F in January, and 70 F in July. The maritime effect also stabilizes daily temperature variations, with day-night fluctuations of 20 F or less. The overall climate is suitable for cold-hardy vinifera varieties, such as Chardonnay, Pinot Noir and Riesling, as well as French hybrids, including Seyval and Vidal Blanc.