Bay of Plenty from 9–16 °C in winter to 22–26 °C in summer. Rainfall occurs more frequently in winter than in summer, but tropical storms in summer and autumn can produce heavy rain with high winds. Central parts of the region can receive up to 2000 mm of rainfall annually, while the eastern and western areas can receive up to 4000 mm. The sub-national GDP of the Bay of Plenty region was estimated at US$6.689 billion in 2003, 5% of New Zealand's national GDP. Agriculture, natural resources and tourism are the major industries. Most (96 per cent) of the region is defined as
Bay of Plenty freight. The hub of regional economic activity is the Port of Tauranga, with well-established rail and road connections to other parts of the region. Three commercial airports also operate in the Bay of Plenty: Tauranga Airport, Rotorua Airport and Whakatane Airport. Car travel remains the dominant form of transport in the region. In 2002, the number of vehicles owned in the region was 189,000, with an average of 1.51 vehicles per household. Public transport bus services exist only in Tauranga and Rotorua. Significant growth in the Western Bay of Plenty District has seen increased strain on road infrastructure, particularly with