Allergy season will soon be in full swing. But new research suggests many Minnesotans may already have runny noses and itchy, watery eyes — days or even weeks earlier than trees would typically release their pollen. Climate Matters, a New Jersey-based environmental nonprofit, analyzed decades of federal weather data across nearly 200 U.S. cities, including Minneapolis, St. Paul, Duluth, Rochester and Mankato. The results, released earlier this month, show that in parts of Minnesota, the annual allergy season now lasts nearly a month longer on average than it did in the 1970s. Minneapolis and St. Paul saw the biggest increase to their allergy season, with 27 extra days on average compared to 50 years ago. Duluth saw a 24-day increase over that period, and Mankato and Rochester added 11 and 10 days to their allergy seasons respectively. The analysis adds to a growing body of studies that, for decades, have shown that seasonal allergies have worsened for people as the planet warms. Re...