paragraph_text: Alonzo Garcelon (May 6, 1813 – December 8, 1906) was the 36th Governor of Maine, and a surgeon general of Maine during the American Civil War.

paragraph_text: James Milton Smith (October 24, 1823November 25, 1890) was a Confederate infantry colonel in the American Civil War, as well as a post-war Governor of Georgia. He was noted as an ardent opponent of Radical Reconstruction.

paragraph_text: Roswell Farnham (July 23, 1827January 5, 1903) was an American politician of the Republican Party, an officer in the Union Army during the American Civil War, a lawyer, and the 38th Governor of Vermont.

paragraph_text: After the Civil War began, Governor Zebulon Baird Vance ordered the construction of breastworks around the city as protection from Union troops. During General Sherman's Carolinas Campaign, Raleigh was captured by Union cavalry under the command of General Hugh Judson Kilpatrick on April 13, 1865. As the Confederate cavalry retreated west, the Union soldiers followed, leading to the nearby Battle of Morrisville. The city was spared significant destruction during the War, but due to the economic problems of the post-war period and Reconstruction, with a state economy based on agriculture, it grew little over the next several decades.

paragraph_text: The region also experiences occasional periods of drought, during which the city sometimes has restricted water use by residents. During the late summer and early fall, Raleigh can experience hurricanes. In 1996, Hurricane Fran caused severe damage in the Raleigh area, mostly from falling trees. The most recent hurricane to have a considerable effect on the area was Isabel in 2003. Tornadoes also have on occasion affected the city of Raleigh most notably the November 28, 1988 tornado which occurred in the early morning hours and rated an F4 on the Fujita Tornado Scale and affected Northwestern portions of the city. Also the April 16, 2011 F3 Tornado which affected portions of downtown and North east Raleigh and the suburb of Holly Springs.

paragraph_text: Although the period in which most tornadoes strike (``tornado season '') is March through June, tornadoes - including violent tornadoes and major tornado outbreaks - have been documented in the United States during every month of the year. Two examples of this are when a series of tornadoes hit the state of Indiana on November 22, 1992, and injured at least nine people. Another notable non-season tornado was where a tornado struck the area of McLean County, Illinois. Even though the tornado was during a winter month, it blew 20 railroad cars off their tracks, and hauled a camper over 100 yards (91 m).

paragraph_text: William Sprague IV (September 12, 1830September 11, 1915) was the 27th Governor of Rhode Island from 1860 to 1863, and U.S. Senator from 1863 to 1875. He participated in the First Battle of Bull Run during the American Civil War while he was a sitting Governor.

paragraph_text: Like many American cities, Philadelphia saw a gradual yet pronounced rise in crime in the years following World War II. There were 525 murders in 1990, a rate of 31.5 per 100,000. There were an average of about 600 murders a year for most of the 1990s. The murder count dropped in 2002 to 288, then rose four years later to 406 in 2006 and 392 in 2007. A few years later, Philadelphia began to see a rapid drop in homicides and violent crime. In 2013, there were 246 murders, which is a decrease of over 25% from the previous year, and a decrease of over 44% since 2007. And in 2014, there were 248 homicides, up by one since 2013.

paragraph_text: Fog is fairly common, particularly in spring and early summer, and the occasional tropical storm or hurricane can threaten the region, especially in late summer and early autumn. Due to its situation along the North Atlantic, the city often receives sea breezes, especially in the late spring, when water temperatures are still quite cold and temperatures at the coast can be more than 20 °F (11 °C) colder than a few miles inland, sometimes dropping by that amount near midday. Thunderstorms occur from May to September, that are occasionally severe with large hail, damaging winds and heavy downpours. Although downtown Boston has never been struck by a violent tornado, the city itself has experienced many tornado warnings. Damaging storms are more common to areas north, west, and northwest of the city. Boston has a relatively sunny climate for a coastal city at its latitude, averaging over 2,600 hours of sunshine per annum.

paragraph_text: As an example, Santiago de Compostela, the political capital city, has an average of 129 rainy days and 1,362 millimetres (53.6 in) per year (with just 17 rainy days in the three summer months) and 2,101 sunlight hours per year, with just 6 days with frosts per year. But the colder city of Lugo, to the east, has an average of 1,759 sunlight hours per year, 117 days with precipitations (> 1 mm) totalling 901.54 millimetres (35.5 in), and 40 days with frosts per year. The more mountainous parts of the provinces of Ourense and Lugo receive significant snowfall during the winter months. The sunniest city is Pontevedra with 2,223 sunny hours per year.

paragraph_text: John Milton Thayer (January 24, 1820March 19, 1906) was a general in the Union Army during the American Civil War and a postbellum United States Senator from Nebraska. Thayer served as Governor of Wyoming Territory and Governor of Nebraska.

paragraph_text: While the state is far enough from the coast to avoid any direct impact from a hurricane, the location of the state makes it likely to be impacted from the remnants of tropical cyclones which weaken over land and can cause significant rainfall, such as Tropical Storm Chris in 1982 and Hurricane Opal in 1995. The state averages around 50 days of thunderstorms per year, some of which can be severe with large hail and damaging winds. Tornadoes are possible throughout the state, with West and Middle Tennessee the most vulnerable. Occasionally, strong or violent tornadoes occur, such as the devastating April 2011 tornadoes that killed 20 people in North Georgia and Southeast Tennessee. On average, the state has 15 tornadoes per year. Tornadoes in Tennessee can be severe, and Tennessee leads the nation in the percentage of total tornadoes which have fatalities. Winter storms are an occasional problem, such as the infamous Blizzard of 1993, although ice storms are a more likely occurrence. Fog is a persistent problem in parts of the state, especially in East Tennessee.

paragraph_text: Oklahoma City has a very active severe weather season from March through June, especially during April and May. Being in the center of what is colloquially referred to as Tornado Alley, it is prone to especially frequent and severe tornadoes, as well as very severe hailstorms and occasional derechoes. Tornadoes have occurred in every month of the year and a secondary smaller peak also occurs during autumn, especially October. The Oklahoma City metropolitan area is one of the most tornado-prone major cities in the world, with about 150 tornadoes striking within the city limits since 1890. Since the time weather records have been kept, Oklahoma City has been struck by thirteen violent tornadoes, eleven F/EF4s and two F/EF5. On May 3, 1999 parts of southern Oklahoma City and nearby suburban communities suffered from one of the most powerful tornadoes on record, an F5 on the Fujita scale, with wind speeds estimated by radar at 318 mph (510 km/h). On May 20, 2013, far southwest Oklahoma City, along with Newcastle and Moore, was hit again by a EF5 tornado; it was 0.5 to 1.3 miles (0.80 to 2.09 km) wide and killed 23 people. Less than two weeks later, on May 31, another outbreak affected the Oklahoma City area, including an EF1 and an EF0 within the city and a tornado several miles west of the city that was 2.6 miles (4.2 km) in width, the widest tornado ever recorded.

paragraph_text: The United States averaged 1,274 tornadoes per year in the last decade while Canada reports nearly 100 annually (largely in the southern regions). However, the UK has most tornadoes per area per year, 0.14 per 1000 km2, although these tornadoes are generally weak, and many other European countries have a similar number of tornadoes per area.

paragraph_text: Robert Byington Mitchell (April 4, 1823January 26, 1882) was a brigadier general in the Union Army during the American Civil War and the Governor of the New Mexico Territory from 1866 to 1869.

paragraph_text: Nebraska is fifth overall for sheer numbers of tornadoes, while Indiana has had 88 violent tornado reports from the 1950 -- 2006 period, more than any state except Oklahoma. Iowa reported 3'900 almost as many as Texas. The deadliest tornado in US history, the Tri-State Tornado, struck Missouri, Illinois, and Indiana in March 1925. St. Louis, Missouri and neighboring East St. Louis, Illinois have been hit more than once by violent tornadoes, the most notorious of which was the St. Louis Tornado of May 1896. The New Richmond Tornado of May 1899 and the Flint, Michigan tornado of June 1953 also rank amongst the deadliest tornadoes in US history. The region was badly hit by the Palm Sunday Tornado Outbreak in April 1965 and by the Super Outbreak of April 1974. According to NCDC figures for the 1950 to 2006 period, Nebraska reported 2,440 tornadoes followed by Iowa (2,185), Illinois (2,086), Missouri (1,922), South Dakota (1,487), Minnesota (1,477), Indiana (1,327), North Dakota (1,216), Wisconsin (1,185), Michigan (981), and Ohio (916).

paragraph_text: Because of Oklahoma's position between zones of differing prevailing temperature and winds, weather patterns within the state can vary widely over relatively short distances and can change drastically in a short time. As an example, on November 11, 1911, the temperature at Oklahoma City reached 83 °F (28 °C) in the afternoon (the record high for that date), then an Arctic cold front of unprecedented intensity slammed across the state, causing the temperature to crash 66 degrees, down to 17 °F (−8 °C) at midnight (the record low for that date); thus, both the record high and record low for November 11 were set on the same date. This type of phenomenon is also responsible for many of the tornadoes in the area, such as the 1912 Oklahoma tornado outbreak, when a warm front traveled along a stalled cold front, resulting in an average of about one tornado per hour over the course of a day.

paragraph_text: North Carolina averages fewer than 20 tornadoes per year, many of them produced by hurricanes or tropical storms along the coastal plain. Tornadoes from thunderstorms are a risk, especially in the eastern part of the state. The western Piedmont is often protected by the mountains, which tend to break up storms as they try to cross over; the storms will often re-form farther east. Also a weather phenomenon known as "cold air damming" often occurs in the northwestern part of the state, which can also weaken storms but can also lead to major ice events in winter.

paragraph_text: Zebulon Baird Vance (May 13, 1830 – April 14, 1894) was a Confederate military officer in the American Civil War, the 37th and 43rd Governor of North Carolina, and U.S. Senator. A prolific writer, Vance became one of the most influential Southern leaders of the Civil War and postbellum periods. As a leader of the "New South", Vance favored the rapid modernization of the southern economy, railroad expansion, school construction, and reconciliation with the North.

paragraph_text: Sir John Stawell or Stowell (29 August 1600 – 21 February 1662) of Cothelstone in Somerset, was an English Member of Parliament and Royalist governor of Taunton during the English Civil War.

Question: How many tornadoes occur per year in the state where its Civil War governor died?
Answer: fewer than 20