Los Alamos, NM Climate

Climate Insight: Los Alamos, NM

Los Alamos, New Mexico runs an annual average of 40°F, ranging from a mean daily high of 55°F to a mean daily low of 26°F, per NOAA's 1991–2020 climate normals. July is typically the warmest month of the year, while January is the coldest. Drawn from 2 weather stations, these thirty-year averages smooth out year-to-year swings into a baseline for what a typical month looks like here.

Rainfall (and snow, where it falls) shapes day-to-day life here as much as temperature does. Los Alamos sees about 25.5 inches of precipitation a year, with seasonal snowfall possible. The frost-free season averages 95 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near June 10 and the first fall freeze near September 13. On the energy side, 8,991 heating degree days and 2 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.

On PlainClimate's composite comfort index, Los Alamos scores 54/100 (Moderate), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. The monthly tables above turn that into a planning tool: expect the mildest highs and lows in the shoulder seasons, July-driven heat at the peak of summer, and January-driven cold at the depth of winter. Every number here is a thirty-year average, not a forecast, so any given year can and does run warmer, cooler, wetter, or drier than the normal.