People sometimes fret about global warming when they experience an unusually warm day in winter or early spring, but very warm days during colder months are not unheard of and have been recorded since at least the early twentieth century. For example, some atypical January temperatures include 84°F (29°C) in Las Animas, Colorado, in 1916; 79°F (26°C) in Choteau, Montana, in 1919; and 82°F (28°C) in Indianola, Nebraska, in 1894. More recently, in January 1997, Zapata, Texas, had a record 98°F (36.7°C); and on March 31, 1998, Baltimore, Maryland, reached 97°F (36.1°C), and Concord, New Hampshire, saw 89°F (32°C). Probably the hottest December day recorded in North America was in La Mesa, California, which saw the thermometer climb to 100°F (37.8°C).