2025 Compare Climate & Weather:
Fairfax, VA vs Boulder, CO

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Highlights

On average, there are 245 sunny days per year in Boulder. Fairfax averages 198 sunny days per year. The US average is 205 sunny days.

Boulder, Colorado gets 18.1 inches of rain, on average, per year. Fairfax, Virginia gets 43 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Boulder averages 71.1 inches of snow per year. Fairfax averages 21.5 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

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

Fairfax, Virginia
Summer High: the July high is around 85.7 degrees
Winter Low: the January low is 23.7
Rain: averages 43 inches of rain a year
Snow: averages 21.5 inches of snow a year

BestPlaces Comfort Index
Boulder

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

7.1 / 10
September, June and August are the most pleasant months in Boulder, while December and January are the least comfortable months.

Fairfax

The annual BestPlaces Comfort Index for Fairfax is 7.3 (10=best), which means it is about average compared to other places in Virginia.

7.3 / 10
September, June and May are the most pleasant months in Fairfax, while January and February are the least comfortable months.

Today's Weather - Fairfax, VA

9 AM PST

Partly Sunny

73°F

DAYDESCRIPTIONHIGH / LOWWIND
TodayPartly Sunny81° / 58°NW 5 mph
MondayChance Rain Showers72° / 63°SE 5 to 9 mph
TuesdayRain Showers68° / 63°SE 8 to 13 mph
WednesdayRain Showers75° / 63°E 9 mph
ThursdaySlight Chance Rain Showers then Chance Showers And Thunderstorms79° / 65°SE 5 mph
FridayPartly Sunny then Chance Showers And Thunderstorms86° / 66°S 2 to 8 mph
SaturdaySlight Chance Rain Showers then Chance Showers And Thunderstorms83° / 63°W 5 to 9 mph
Today's Weather - Boulder, CO

9 AM PST

Mostly Sunny then Slight Chance Showers And Thunderstorms

66°F

DAYDESCRIPTIONHIGH / LOWWIND
TodayMostly Sunny then Slight Chance Showers And Thunderstorms85° / 54°ESE 3 to 8 mph
MondaySunny85° / 57°SSW 2 to 6 mph
TuesdayMostly Sunny84° / 51°SSW 5 to 8 mph
WednesdayMostly Sunny then Chance Showers And Thunderstorms71° / 44°W 6 to 16 mph
ThursdayMostly Sunny then Slight Chance Showers And Thunderstorms69° / 44°W 5 to 10 mph
FridayMostly Sunny then Slight Chance Showers And Thunderstorms75° / 47°WNW 2 to 7 mph
SaturdayPartly Sunny then Slight Chance Showers And Thunderstorms77° / 48°W 2 to 7 mph
Average Monthly High / Low (°F)
MonthFairfax, VABoulder, CO
January42° / 24°47° / 19°
February46° / 26°48° / 20°
March54° / 33°55° / 27°
April66° / 42°62° / 34°
May74° / 52°72° / 43°
June82° / 61°82° / 51°
July86° / 66°88° / 57°
August84° / 65°86° / 55°
September78° / 57°78° / 46°
October67° / 45°66° / 36°
November57° / 36°54° / 26°
December46° / 27°45° / 18°
Hot, Freezing, Rainy, Snowy Days: Fairfax / Boulder
MonthHot DaysFreezing DaysRainy DaysSnowy Days
January0 / 025 / 2810 / 53 / 5
February0 / 022 / 259 / 53 / 5
March0 / 016 / 2310 / 71 / 6
April0 / 04 / 1311 / 90 / 4
May1 / 10 / 212 / 110 / 1
June3 / 60 / 011 / 90 / 0
July7 / 140 / 011 / 90 / 0
August6 / 90 / 09 / 100 / 0
September2 / 30 / 19 / 70 / 0
October0 / 03 / 108 / 60 / 2
November0 / 011 / 229 / 50 / 4
December0 / 023 / 2810 / 52 / 5
July is the hottest month for Fairfax with an average high temperature of 85.7°, which ranks it as cooler than most places in Virginia. In Fairfax, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Fairfax are September, June and May.

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.
January has the coldest nighttime temperatures for Fairfax with an average of 23.7°. This is about average compared to other places in Virginia.

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

In Fairfax, there are 18.6 days annually when the high temperature is over 90°, which is cooler than most places in Virginia.

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 Fairfax, there are 102.5 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Virginia.

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 Fairfax, there are 0.6 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Virginia.

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

May is the wettest month in Fairfax with 4.6 inches of rain, and the driest month is February with 2.8 inches. The wettest season is Summer with 27% of yearly precipitation and 20% occurs in Spring, which is the driest season. The annual rainfall of 43.0 inches in Fairfax means that it is drier than most places in Virginia.


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.

May is the rainiest month in Fairfax with 12.2 days of rain, and October is the driest month with only 8.2 rainy days. There are 119.2 rainy days annually in Fairfax, which is rainier than most places in Virginia. The rainiest season is Summer when it rains 28% of the time and the driest is Winter with only a 22% chance of a rainy day.

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.

An annual snowfall of 21.5 inches in Fairfax means that it is one of the snowiest places in Virginia.

An annual snowfall of 71.1 inches in Boulder means that it is snowier than most places in Colorado.
February is the snowiest month in Fairfax with 7.8 inches of snow, and 5 months of the year have significant snowfall.

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

DID YOU KNOW?

Many people confuse Weather and Climate, but they are different. Weather refers to the conditions of the atmosphere over a short period of time, while Climate refers to the conditions of the atmosphere over a long period of time.

Weather, more specifically, refers to how the atmosphere behaves and its effects on life and human activities. Most people think of Weather in terms of what can be observed: temperature, humidity, precipitation, and cloudy/sunny conditions. Weather conditions constantly change on a minute-to-minute basis.

Climate is a record of the average weather conditions for a given place over a long period of time, often referred to as Climate Normals. A 30-year period of record is a common requirement to be considered a Climate Normal.

Reviews for Fairfax    2 Reviews
Jill · Sherman Oaks, CA
re:
Over 16 years ago

Hi. I'd like to know if you still feel the same way about living in Broomfield. I went there this past July to check it out (along with Lafayette, Boulder (can't  More

   |    Reply
NC For Me · Apex, NC
re:
Over 16 years ago

Apex is perfect for what you are looking for. It's close enough to Raleigh, Durham, Chapel Hill to find a job and Cary the next town over, is a little more expensive but  More

   |    Reply

Start Your Review of Fairfax

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Reviews for Boulder    2 Reviews
Jill · Sherman Oaks, CA
re:
Over 16 years ago

Hi. I'd like to know if you still feel the same way about living in Broomfield. I went there this past July to check it out (along with Lafayette, Boulder (can't  More

   |    Reply
NC For Me · Apex, NC
re:
Over 16 years ago

Apex is perfect for what you are looking for. It's close enough to Raleigh, Durham, Chapel Hill to find a job and Cary the next town over, is a little more expensive but  More

   |    Reply

Start Your Review of Boulder

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Zips In Fairfax, Virginia
22030
Zips In BOULDER, COLORADO
80302, 80304, 80301, 80303, 80305, 80310
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