If you're finding yourself sniffling more than usual for this time of year, you're not alone: A number of experts predict that this fall will be a sneezier-than-normal allergy season.

Because of the warm temperatures this year, ragweed, which typically pollinates mid-August, got a jumpstart on the process and may linger longer, too. Up to 20 percent of Americans are allergic to ragweed, the most common culprit for fall allergies. (Mold and dust can cause trouble, too.)

No matter what you're allergic to, however, where you live can play a role in your symptoms. Once again, the Asthma and Allergy Foundation of America (AAFA) has named the worst cities and towns across the country for people with fall allergies based on three criteria.

How'd they calculate the ranking? First was the pollen count, which was averaged at 300 grains per cubic meter of air across the country. Next was the amount of allergy meds the average person used in those areas, with a nationwide average of .96. Last was the number of board-certified allergists nearby -- about 1.04 per 10,000 patients on average. These measures were used to assign a score to each metro area, with 100 being the worst. (The national average was 64.36.)

This year, there are a number of surprising changes from last year's list, including a couple of metro areas that jumped more than 20 positions from the previous ranking. Taking the crown as 2012's biggest fall allergy capital? Louisville, Kentucky.

Wonder if your hometown was named one of this fall's "allergy capitals"? Check out the 20 worst offenders in the slideshow below, then click over to the AAFA's website for the entire list.

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  • #20. Youngstown, Ohio

    Rank Last Year: #48 Youngstown was worse than average on all three measures and had a total score of 76.41.

  • #19: Tulsa, Oklahoma

    Rank Last Year: #10 Tulsa, at 76.90, has a worse than average pollen content and medicine use, but a better than average number of local allergists.

  • #18. Grand Rapids, Michigan

    Rank Last Year: #37 Grand Rapids has an average number of allergists available and average medicine use, but worse than average pollen count and a total score of 76.99.

  • #17: Birmingham, Alabama

    Rank Last Year: #13 With an average pollen count, worse than average medicine use and a better than average number of allergists, Birmingham clocked in at 78.20.

  • #16: Little Rock, Arkansas

    Rank Last Year: #19 Little Rock's total score of 78.59 reflects a worse than average pollen count and medicine use, but the city has a better than average number of local allergists.

  • #15: San Antonio, Texas

    Rank Last Year: #15 San Antonio measures similarly to Little Rock, with a slightly higher total score of 79.90.

  • #14. Rochester, New York

    Rank Last Year: #49 With a worse than average pollen count, average medicine use and a better than average number of allergists, Rochester scores 80.51.

  • #13. New Orleans, Louisiana

    Rank Last Year: #28 The home of Mardi Gras has worse than average medicine use and pollen, but a higher number of allergists than the average, with a total score of 80.69.

  • #12. Buffalo, New York

    Rank Last Year: #36 Buffalo measures similarly to New Orleans, with a slightly higher total score of 82.12.

  • #11: Chattanooga, Tennessee

    Rank Last Year: #11 Chattanooga, at 87.26, also has worse than average pollen and medicine use but better than average allergists.

  • #10. Baton Rouge, Louisiana

    Rank Last Year: #23 So does Baton Rouge, with a slightly higher score of 87.54.

  • #9: Madison, Wisconsin

    Rank Last Year: #8 Madison, too, scores worse than average on pollen count and medicine use but better than average for local allergists, totaling 87.66.

  • #8: Memphis, Tennessee

    Rank Last Year: #12 Memphis earned a total score of 88.05 with worse than average pollen and medicine use and an average number of allergists.

  • #7: Oklahoma City, Oklahoma

    Rank Last Year: #5 Coming in at 88.80, Oklahoma City has worse than average medicine use and pollen, but a better than average amount of allergists.

  • #6: Dayton, Ohio

    Rank Last Year: #2 Dayton scored worse than average on all measures, with a total of 89.18.

  • #5: McAllen, Texas

    Rank Last Year: #3 McAllen also scored worse than average on all three criteria, for a total of 94.15.

  • #4: Jackson, Mississippi

    Rank Last Year: #4 With an average pollen score, worse than average medicine use and a better than average number of board-certified allergists, Jackson comes in at 96.09.

  • #3: Knoxville, Tennessee

    Rank Last Year: #1 Knoxville has worse than average medicine use and pollen, but scored better than average for number of allergists for a total of 98.79.

  • #2: Wichita, Kansas

    Rank Last Year: #7 The runner up for the worst place to live with fall allergies scored a 99.85 for worse than average pollen and medicine use and an average number of allergists nearby.

  • #1: Louisville, Kentucky

    Rank Last Year: #6 Louisville takes the cake with a perfect 100 for worse than average pollen and medicine use. It did come in above average, however, in terms of the number of board-certified allergists per 10,000 patients.

For more on allergies, click here.