Utah Environment and Climate

Environment and Climate

      Utah features a dry, mostly desert climate, although its many mountains feature a large variety of climates, with the highest points in the Uinta Mountains being above the timberline. The dry weather results from the state lying mostly in the rain shadow of the Sierra Nevada in California. The eastern half of the state lies in the rain shadow of the Wasatch Mountains. The primary source of precipitation for the state is the Pacific Ocean, with the state usually lying in the path of large Pacific storms from mid-October through April, although northern Utah often sees these large storms earlier and later. In summer, the state, especially southern and eastern Utah, lies in the path of monsoon moisture from the Gulf of California. Most of the lowland areas receive less than 12 inches (300 mm) of precipitation annually, although the I-15 corridor, including the densely-populated Wasatch Front, receive approximately 15 inches (380 mm). The Great Salt Lake Desert is the driest area of the state, with less than 5 inches (125 mm). Snowfall is common in all but the far southern valleys. Although St. George only receives about 3 inches (7.5 cm) per year, Salt Lake City sees about 60 inches (150 cm), enhanced by the lake-effect snow from the Great Salt Lake, which increases snowfall totals to the south, southeast, and east of the lake. Some areas of the Wasatch Range in the path of the lake-effect see up to 500 inches (1,270 cm) per year, and its dry, fluffy density leads to Utah's ski resorts adopting the slogan "the Greatest Snow on Earth". In winter, temperature inversions are an issue across Utah's low basins and valleys, leading to thick haze and fog that can sometimes occur weeks at a time, especially in the Uintah Basin.
      Utah's temperatures are extreme, with cold temperatures in winter due to its elevation, and very hot summers statewide (with the exception of mountain areas and high mountain valleys). Utah is usually protected from major blasts of cold air by mountains lying north and east of the state, although major Arctic blasts can occasionally reach the state. Average January high temperatures range from around 30 °F (-1 °C) in some northern valleys to almost 55 °F (13 °C) in St. George. Temperatures dropping below 0 °F (-18 °C) should be expected on occasion in most areas of the state most years, although some areas see it often (for example, the town of Randolph averages about 50 days per year with temperatures dropping that low). In July, average highs range from about 85 °F (29 °C) to 100 °F (38 °C). However, the low humidity and high elevation typically leads to large temperature variations, leading to cool nights most summer days. The record high temperature in Utah was 118 °F (47 °C), recorded south of St. George on July 4, 2007, and the record low was -69 °F (-56 °C), recorded at Peter's Sink in the Bear River Mountains of northern Utah on February 1, 1985.
      Utah, like most of the western United States, has few days of thunderstorms. On average there are fewer than 40 days of thunderstorm activity during the year, although these storms can be briefly intense when they do occur. They are most likely to occur during monsoon season from about mid-July through mid-September, especially in southern and eastern Utah. Dry lightning strikes and the general dry summer weather often spark wildfires in summer, while intense thunderstorms can lead to flash flooding, especially in the rugged terrain of southern Utah. Tornadoes are uncommon in Utah, with an average of two striking the state yearly, rarely higher than F1 intensity. One exception of note, however, was the strong F2 Salt Lake City Tornado that sliced across the downtown metro area of Salt Lake City on August 11, 1999, striking large buildings and causing approximately $170 million in damage, and one fatality. More

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