The average annual temperature is 44.3 degrees Fahrenheit. The mean precipitation is 43.8 inches. Snowfall averages 85 inches annually, and snow may accumulate to depths up to two feet or more. Flooding in Lewiston is generally limited to the area along the banks of the Androscoggin River. This flooding occurs mainly in the spring when heavy snowmelt and rains combine to cause considerable runoff.
Flooding can also occur in the fall, from hurricanes and tropical storms.
Ice is a major hazard in the spring, causing even greater flooding. In addition, ice jams pose a major threat to bridges and other structures. Structural damage has occurred during floods dating back to 1896. The economy of the area is based on manufacturing with textile and shoe plants as the major employers.