The humid subtropical climate (Koppen Cfa) of central, southern and eastern Oklahoma is influenced heavily by southerly winds bringing moisture from the Gulf of Mexico. Traveling westward, the climate transitions progressively toward a semi-arid zone (Koppen BSk) in the high plains of the Panhandle and other western areas from about Lawton westward, less frequently touched by southern moisture. Precipitation and temperatures decline from east to west accordingly, with areas in the southeast averaging an annual temperature of 62 °F (17 °C) and an annual rainfall of generally over 40 inches (1,020 mm) and up to 56 inches (1,420 mm), while areas of the (higher-elevation) panhandle average 58 °F (14 °C), with an annual rainfall under 17 inches (430 mm). COUNT 5
QSN1 What parts of Oklahoma are in a humid subtropical climate? ANS1 central, southern and eastern QSN2 Where do Oklahoma's winds bring moisture from? ANS2 Gulf of Mexico QSN3 What is Oklahoma's western climate type? ANS3 semi-arid QSN4 Where in Oklahoma does the semi-arid zone begin? ANS4 Lawton QSN5 What is the average annual temperature in southeast Oklahoma? ANS5 62 °F