Based on a preliminary count have been 36 tornadoes officially confirmed in Oklahoma so far this year as of May 31. However, there have been numerous reports of tornadoes on May 30 and 31 that have yet to be surveyed and confirmed, and the actual number of tornadoes from these days is not known.
So far there have been over 300 confirmed tornadoes in the United States in 2013. Major tornadoes occurred in Hattiesburg, Mississippi on February 10; Granbury, Texas on May 15; Shawnee, Oklahoma on May 19; Moore, Oklahoma on May 20; and El Reno, Oklahoma on May 31.
As of May 31, 2013 there have been a number of recent tornadoes in Oklahoma. The most publicized of these, the Moore EF5 of May 20, traveled about 17 miles.
Oklahoma gets more tornadoes. It averages 64 tornadoes per year, far greater than Georgia's average of 31.
None. Oklahoma is too far inland to get hurricanes.
Oklahoma is more likely to have a tornado. Although New York does get tornadoes Oklahoma has them far more frequently.
None. There were no tornadoes anywhere in Alaska in 2013, and hurricanes simply cannot hit there. If you meant Rogers, Arkansas (AR) there were no recorded tornadoes there in Rogers. Arkansas is too far inland to get hurricanes.
So far there have been four EF3 tornadoes in Oklahoma in 2010. They all occurred occurred on May 10.
worldwide data is not available. Since 2000 there have been 16,818 recorded tornadoes in the U.S. Note that the figure for tornadoes so far in 2013 is only a preliminary estimate.
Virtually anywhere it wants. Canada has had F4 and F5 tornadoes. In the United States F4 tornadoes have struck as far east as Massachusetts and as far west as western Texas. F5 tornadoes have hit as far east as Pennsylvania. Some of the worst hit states have been Texas, Oklahoma, Kansas, Iowa, and Alabama.
1950-2011 Oklahoma had 1362 recorded F0 or EF0 tornadoes. For 2012 so far there is a preliminary count of 4 EF0 tornadoes in 2012. Though this will likely go up as a number of recent tornadoes will likely be rated, and still more will come in from reports that were not initially published. It is important to note, however that prior to the 1990s a significant portion of tornadoes that would be rated F0 were missed, with the vast majority being missed through the 1970s. Because of this, the number of tornadoes of F0 strength that have occurred in Oklahoma is probably much higher.
I too have tried to answer this, I have looked and come to this answer. There have been some hit outside of the Duncan proper area, but so far as I can find none in Duncan proper as far back as 1890.