Historical weather data, all-time temperature records, and monthly climate averages for Los Alamos, NM. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Los Alamos runs cool, with an average high of just 55° and a low that can dip to freezing. The date has seen wild swings over 107 years of records — from a balmy 73° in 2021 down to a brutal 10° in 1983. There's a 1-in-10 chance of snow today, so don't put the layers away just yet.
Los Alamos has logged a 116-degree temperature range in its recorded history, from -18° in January 1963 to a scorching 98° in July 2020. The most dramatic single-day weather event on record was September 13, 2013, when 3.52 inches of rain fell — and a January 1987 storm buried the town under 22 inches of snow.
Los Alamos stays cool well into spring, with highs only reaching the upper 50s in April before climbing to a peak around the third week of June at 82°. Winters are cold but short — January averages just 39° — and the year's wettest stretch arrives in late August during monsoon season, averaging nearly an inch of rain per week.