A watch means that weather conditions are right for the formation of the stated danger. You should listen to local radio and television stations for up to date weather information, if possible using a battery operated set. Blizzards and Cold Temperatures Northern areas of the United States often experience very cold temperatures in winter. The coldest temperatures in the United States have been recorded in Alaska. Other states which experience very cold temperatures or blizzards are Connecticut, Delaware, Idaho, Maine, Massachusetts, Michigan, Minnesota, Montana, New Hampshire, New Jersey, New York State, North Dakota, Ohio, Pennsylvania, Rhode Island, South Dakota, Vermont, Virginia, West Virginia and Wisconsin.
Most Canadian provinces experience very low temperatures in winter.
Extremely low temperatures occur at high altitudes in the Rocky Mountains , the Sierra Nevada Mountains and the Cascade Mountains . Extreme Heat Many areas of the USA and Canada suffer extreme heat in summer. The southwest tends to be very hot and very dry in summer, while the southeast tends to be very hot and very humid. Visitors should take precautions such as drinking frequently and wearing wide-brimmed hats. Wearing sunglasses is also highly advisable, especially when driving so as to reduce the glare from the road surface.