The state is classified as humid subtropical. The average annual temperature is 64 °F (18 °C). Temperatures tend to be warmer in the southern part of the state with its proximity to the Gulf of Mexico, while the northern parts of the state, especially in the Appalachian Mountains in the northeast, tend to be slightly cooler.[101] Generally, Alabama has very hot summers and mild winters with copious precipitation throughout the year. Alabama receives an average of 56 inches (1,400 mm) of rainfall annually and enjoys a lengthy growing season of up to 300 days in the southern part of the state.

Summers in Alabama are among the hottest in the U.S., with high temperatures averaging over 90 °F (32 °C) throughout the summer in some parts of the state. Alabama is also prone to tropical storms and hurricanes. Areas of the state far away from the Gulf are not immune to the effects of the storms, which often dump tremendous amounts of rain as they move inland and weaken.

South Alabama reports many thunderstorms. The Gulf Coast, around Mobile Bay, averages between 70 and 80 days per year with thunder reported. This activity decreases somewhat further north in the state, but even the far north of the state reports thunder on about 60 days per year. Occasionally, thunderstorms are severe with frequent lightning and large hail; the central and northern parts of the state are most vulnerable to this type of storm. Alabama ranks ninth in the number of deaths from lightning and tenth in the number of deaths from lightning strikes per capital.

Tornado damage in Phil Campbell following the statewide April 27, 2011, tornado outbreak

Alabama, along with Oklahoma and Iowa, has the most confirmed F5 and EF5 tornadoes of any state, according to statistics from the National Climatic Data Center for the period January 1, 1950, to June 2013.[103] Several long-tracked F5/EF5 tornadoes have contributed to Alabama reporting more tornado fatalities since 1950 than any other state. The state was affected by the 1974 Super Outbreak and was devastated tremendously by the 2011 Super Outbreak. The 2011 Super Outbreak produced a record number of tornadoes in the state. The tally reached 62.

The peak season for tornadoes varies from the northern to southern parts of the state. Alabama is one of the few places in the world that has a secondary tornado season in November and December besides the typically severe spring. The northern part—along the Tennessee River Valley—is most vulnerable. The area of Alabama and Mississippi most affected by tornadoes is sometimes referred to as Dixie Alley, as distinct from the Tornado Alley of the Southern Plains.

Alabama’s industrial outputs include iron and steel products (including cast-iron and steel pipe); paper, lumber, and wood products; mining (mostly coal); plastic products; cars and trucks; and apparel. In addition, Alabama produces aerospace and electronic products, mostly in the Huntsville area, the location of NASA’s George C. Marshall Space Flight Center and the U.S. Army Materiel Command, headquartered at Redstone Arsenal.

Mercedes-Benz U.S. International in Tuscaloosa County was the first automotive facility to locate within the state.

A great deal of Alabama’s economic growth since the 1990s has been due to the state’s expanding automotive manufacturing industry. Located in the state are Honda Manufacturing of Alabama, Hyundai Motor Manufacturing Alabama, Mercedes-Benz U.S. International, and Toyota Motor Manufacturing Alabama, as well as their various suppliers. Since 1993, the automobile industry has generated more than 67,800 new jobs in the state. Alabama currently ranks 4th in the nation for vehicle exports.

Automakers accounted for approximately a third of the industrial expansion in the state in 2012. The eight models produced at the state’s auto factories totaled combined sales of 74,335 vehicles for 2012. The strongest model sales during this period were the Hyundai Elantra compact car, the Mercedes-Benz GL-Class sport utility vehicle, and the Honda Ridgeline sport utility truck.[182]

Airbus Mobile Engineering Center at the Brockley Aero plex in Mobile

Steel producers Outokumpu, Nucor, SSAB, ThyssenKrupp, and U.S. Steel have facilities in Alabama and employ more than 10,000 people. In May 2007, German steelmaker ThyssenKrupp selected Calvert in Mobile County for a 4.65 billion combined stainless and carbon steel processing facility.[183] ThyssenKrupp’s stainless-steel division, including the stainless portion of the Calvert plant, was sold to Finnish stainless-steel company. in 2012.[184] The remaining portion of the ThyssenKrupp plant had final bids submitted by ArcelorMittal and Nippon Steel for $1.6 billion in March 2013.

The Hunt Refining Company, a subsidiary of Hunt Consolidated, Inc., is based in Tuscaloosa and operates a refinery there. The company also operates terminals in Mobile, Melvin, and Moundville. JVC America, Inc. operates an optical disc replication and packaging plant in Tuscaloosa.

The Goodyear Tire and Rubber Company operates a large plant in Gadsden which employs about 1,400 people. It has been in operation since 1929.

Construction of an Airbus A320 family aircraft assembly plant in Mobile was formally announced by Airbus CEO Fabrice from the Mobile Convention Center on July 2, 2012. The plans include a $600 million factory at the Brockley Aero plex for the assembly of the A319, A320 and A321 aircraft. Construction began in 2013, with plans for it to become operable by 2015[needs update] and produce up to 50 aircraft per year by 2017. The assembly plant is the company’s first factory to be built within the United States. It was announced on February 1, 2013, that Airbus had hired Alabama-based Hoar Construction to oversee construction of the facility.