Climate Overview
The climate in Los Alamos is cool. The average annual temperature is 9°C and approximately 477mm of precipitation falls per year. August is the wettest month, receiving around 118mm of rainfall. Los Alamos is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, June, August. The coldest months are January, December, February, when temperatures can drop to -9°C. Snowfall occurs from January to December, with around 115cm accumulating over the season.
Temperature
Los Alamos has a wide annual temperature range, spanning 39°C from the coldest to warmest months. The warmest month is July, when average highs reach 30°C and the mean temperature sits around 22°C. The coldest month is January, when overnight lows fall to -9°C and the daily average is -4°C. On average, daily temperatures fluctuate by about 14°C between overnight lows and afternoon highs. The sharpest temperature change occurs between May and June, with a 8°C shift in average temperatures.
Precipitation
Los Alamos is a relatively dry area, receiving approximately 477mm of precipitation annually, which averages out to around 40mm per month. The wettest month is August, averaging 118mm of rainfall. April and December also tend to see above-average precipitation. The driest month is March, with just 7mm. That's 111mm less than August, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic. Snowfall is a regular feature from January to December, with around 115cm accumulating over the season. December typically sees the most snow at around 37cm.
Wind
Los Alamos is relatively calm, with an average annual wind speed of 2km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is March, averaging 3km/h, though still comfortable for most outdoor activities. The calmest conditions occur in August, with average winds dropping to 1km/h, making it an ideal period for wind-sensitive activities. Wind speeds vary significantly across the year, with a 2km/h difference between the calmest and windiest months. This level of variation is worth factoring into travel plans.
Seasons
52 days until Autumn
It is currently summer in Los Alamos, which began on June 21, 2026. Los Alamos is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in July at around 30°C, while the coldest stretch bottoms out in January near -9°C. Autumn is next, beginning on September 23, 2026 — 52 days from now.
Spring
Temperatures range from -2 to 19°C. Rainfall is relatively light, with around 105mm over the season and a monthly average of 35mm. Winds are generally light, averaging 3km/h. Light layers work well as temperatures warm through the season — a great time to be outdoors.
Summer
Temperatures range from 11 to 30°C. Precipitation is moderate at around 177mm for the season, averaging 59mm per month. Winds are generally light, averaging 2km/h. Comfortable clothing with a light layer for cooler evenings is all you need.
Autumn
Temperatures range from -1 to 23°C. Rainfall is relatively light, with around 106mm over the season and a monthly average of 35mm. Expect around 12cm of snow accumulation during this period. Winds are generally light, averaging 2km/h. Layered clothing works best as temperatures gradually cool — enjoy the crisp air and changing scenery.
Winter
Temperatures range from -9 to 9°C. Rainfall is relatively light, with around 90mm over the season and a monthly average of 30mm. Expect around 76cm of snow accumulation during this period. Winds are generally light, averaging 2km/h. Warm winter clothing and waterproof boots are a must, and travel may be affected by snow.
Best Time to Visit
The best time to visit Los Alamos is during June, July and September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 19°C with modest rainfall averaging 35mm per month. By contrast, January can be quite cold with temperatures dropping to -9°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.
Monthly Climate Data
The table below shows monthly climate averages for Los Alamos based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.
