A visit to Montana is not complete without some hiking. High temperatures at Lewis and Clark Trail throughout the summertime months are in the 80's with nighttime lows in the 50's. The wintertime comes with highs in the 20's while Lewis and Clark Trail nighttime low temperatures during the winter are in the 0's. Lewis and Clark Trail is mostly a relatively dried up site. June is when you get the most rain here; February meanwhile is the driest month.