Idaho — Weather
Despite being inland, Idaho weather is largely influenced by climate from the Pacific Ocean. In general, the southern portion of the state is warmer, while the northern region gets more precipitation. In winter, this means lots of snow in the north, where up to 500 inches have accumulated in one season in years past. While Boise gets an average of 21 inches of snow each winter, Coeur d’Alene averages at 52 inches every year, and the mountains get significantly more still. Winter temperatures average around 34°F December through February throughout most of the state, with nightly lows dropping well below freezing.
Summers bring warm daytime highs around 90°F in Boise and 83°F in Sun Valley. Most of the state falls somewhere in between, with cooler temperatures in the mountains and up north, and warmer weather along the southern plains. Thunderstorms are common across Idaho during the summer months, which are relatively brief (late June to late August). Visitors can expect sunshine 80 percent of the time during the summer and about 50 percent of the time in winter.
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