2025 Compare Climate & Weather:
Boulder, CO vs Los Alamos, NM

Highlights

On average, there are 276 sunny days per year in Los Alamos. Boulder averages 245 sunny days per year. The US average is 205 sunny days.

Los Alamos, New Mexico gets 16.4 inches of rain, on average, per year. Boulder, Colorado gets 18.1 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Los Alamos averages 38.5 inches of snow per year. Boulder averages 71.1 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Los Alamos, New Mexico
Summer High: the July high is around 83.8 degrees
Winter Low: the January low is 18.6
Rain: averages 16.4 inches of rain a year
Snow: averages 38.5 inches of snow a year

Boulder, Colorado
Summer High: the July high is around 88.1 degrees
Winter Low: the January low is 18.9
Rain: averages 18.1 inches of rain a year
Snow: averages 71.1 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Los Alamos is 7.4 (10=best), which means it is less comfortable than most places in New Mexico.

The annual BestPlaces Comfort Index for Boulder is 7.1 (10=best), which means it is about average compared to other places in Colorado.

Today's Weather - Boulder, CO

46°F

Today's Weather - Los Alamos, NM

37°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Boulder / Los Alamos

July is the hottest month for Boulder with an average high temperature of 88.1°, which ranks it as about average compared to other places in Colorado. In Boulder, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Boulder are September, June and May.

July is the hottest month for Los Alamos with an average high temperature of 83.8°, which ranks it as cooler than most places in New Mexico. In Los Alamos, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Los Alamos are September, August and June.

December has the coldest nighttime temperatures for Boulder with an average of 18.3°. This is one of the warmest places in Colorado.

January has the coldest nighttime temperatures for Los Alamos with an average of 18.6°. This is about average compared to other places in New Mexico.

In Boulder, there are 32.4 days annually when the high temperature is over 90°, which is about average compared to other places in Colorado.

In Los Alamos, there are 9.5 days annually when the high temperature is over 90°, which is cooler than most places in New Mexico.

In Boulder, there are 151.2 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Colorado.

In Los Alamos, there are 155.4 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in New Mexico.

In Boulder, there are 5.5 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Colorado.

In Los Alamos, there are 0.9 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in New Mexico.

May is the wettest month in Boulder with 2.5 inches of rain, and the driest month is January with 0.6 inches. The wettest season is Summer with 37% of yearly precipitation and 11% occurs in Spring, which is the driest season. The annual rainfall of 18.1 inches in Boulder means that it is wetter than most places in Colorado.


August is the wettest month in Los Alamos with 2.8 inches of rain, and the driest month is February with 0.7 inches. The wettest season is Autumn with 41% of yearly precipitation and 15% occurs in Spring, which is the driest season. The annual rainfall of 16.4 inches in Los Alamos means that it is wetter than most places in New Mexico.

May is the rainiest month in Boulder with 10.5 days of rain, and January is the driest month with only 4.7 rainy days. There are 88.0 rainy days annually in Boulder, which is rainier than most places in Colorado. The rainiest season is Autumn when it rains 31% of the time and the driest is Spring with only a 17% chance of a rainy day.

August is the rainiest month in Los Alamos with 12.4 days of rain, and January is the driest month with only 4.5 rainy days. There are 80.0 rainy days annually in Los Alamos, which is one of the rainiest places in New Mexico. The rainiest season is Autumn when it rains 37% of the time and the driest is Spring with only a 18% chance of a rainy day.

An annual snowfall of 71.1 inches in Boulder means that it is snowier than most places in Colorado.

An annual snowfall of 38.5 inches in Los Alamos means that it is snowier than most places in New Mexico.

March is the snowiest month in Boulder with 14.3 inches of snow, and 9 months of the year have significant snowfall.

December is the snowiest month in Los Alamos with 8.9 inches of snow, and 7 months of the year have significant snowfall.