Boise, Idaho – A colder late-winter pattern is expected to settle across Idaho heading into early March, increasing the probability of below-average temperatures and a greater opportunity for snow during the Feb. 28 through Mar. 13 timeframe.
According to the National Weather Service Climate Prediction Center, much of Idaho carries a 40% to 50% probability of below-normal temperatures in the Week 3-4 outlook. The colder signal spans the Interstate 84 corridor from Boise to Twin Falls, north along Interstate 15 through Pocatello and Idaho Falls, and across Interstate 90 in the Panhandle near Coeur d’Alene.
This extended-range guidance favors a deeper trough pattern over the northern Rockies and Pacific Northwest, allowing cooler air masses to dominate more frequently compared to late-February averages. That setup increases the likelihood of lower snow levels, especially across the Sawtooth, Bitterroot and central mountain ranges.
Precipitation probabilities lean near to slightly above normal across portions of the state. Combined with below-normal temperatures, that raises the potential for accumulating mountain snow and an elevated chance of measurable snowfall in valley locations during stronger systems.
Communities from Boise and Nampa to Idaho Falls, Lewiston and Coeur d’Alene fall within this colder signal. The Week 3-4 outlook reflects broad atmospheric trends rather than specific storm timing.
Additional refinements are expected as the late-February to mid-March window approaches and shorter-range guidance provides greater clarity on individual systems.
