The cool, moist weather of this region is milder along the coast than it is in the uplands, with mean temperatures of 15.5°C in the summer and -2°C in the winter (compared to a summer high of 14.5°C and a winter low of -8°C in the higher Gaspé Peninsula). Canada’s second highest mean annual precipitation is found in the coastal areas of this zone, reaching 1500-1600 millimetres. Dramatic storms frequently sweep in from the Atlantic to batter exposed areas like the steep cliffs and headlands of Cape Breton Highlands National Park, the sand-dune stretches of Prince Edward Island, and the salt marshes and lagoons of Kouchibouguac National Park, in New Brunswick. Even more dramatic are the tides in the Bay of Fundy, between Nova Scotia and New Brunswick. There, every twelve and a half hours, billions of tonnes of water flush the bay, raising and lowering the water level by as much as 16 metres, causing the highest tides in the world and sending tidal bores surging up rivers such as the Maccan and St. Croix.