Triple digit heat is common in the Plains. Temperatures in areas closer to the West Coast are influenced by the cool Pacific Ocean, reducing the 100 degree heat there. Air tends to be drier in much of the West in the summer, and dry air is able to warm up more readily than moist air. Lower elevations also tend to experience higher temperatures, as temperatures decrease when moving higher into the atmosphere. benefit from a higher sun angle, which results in an increase in solar radiation. What's behind the heat, or lack thereof, in the West? These very hot conditions are due to a combination of factors, including elevation, humidity and location. (MORE: Here's When The First 90 Degree Highs Of The Year Typically Happen ) The highest temperature on record there is 107. The most 100 degree days in Missoula, Montana, were 11 in 2007, and in 2022, there were 10 days with a high of at least 100. Triple digit temperatures are more common east of the Cascades Even locations in Montana soar to 100 degrees from time to time. Portland also set a new record for highest temperature during that heat wave when the high hit 117. Seattle has only measured a 100 degree reading six times, two of which were during the historic heat wave of June 2021 when its highest temperature on record of 107 degrees was reached. Unsurprisingly, Seattle and Portland, Oregon, often do not have 100 degree days. Triple digit temperatures are less common elsewhere in the West. The highest temperature on record in Las Vegas is 117, which has been reached several times, most recently in 2021. Las Vegas, Phoenix and Tucson are all premium members of the triple digit club, as the average number of 100 degree days for all three cities is well above 50 per year. Many cities in the West typically experience temperatures above the century mark every year and that's particularly the case in the Desert Southwest. The Desert Southwest is where 100 degree heat is most common. Below, we take a look at some interesting statistics on triple digit heat across the Lower 48. For some locations, triple digit heat can last for months, but for others, it has never happened since records began.Ĭlimate and geography can have major impacts on how often cities experience temperatures climbing to 100 degrees. High temperatures soar past the century mark each summer in some areas of the United States and blistering heat becomes the norm. The 100 degree club is elusive for many cities, but others can count on being a member every year. Sign up for the Morning Brief email newsletter to get weekday updates from The Weather Channel and our meteorologists.
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