There are a wide range of environmental factors in the Rocky Mountains. The Rockies range in latitude between the Liard River in British Columbia (at 59° N) and the Rio Grande in New Mexico (at 35° N). Prairie occurs at or below , while the highest peak in the range is Mount Elbert at . Precipitation ranges from per year in the southern valleys to per year locally in the northern peaks. Average January temperatures can range from in Prince George, British Columbia, to in Trinidad, Colorado. Therefore, there is not a single monolithic ecosystem for the entire Rocky Mountain Range.