Fairfax Temperatures: Monthly Averages and Year-Round Insights
On this page, we’ll explore Fairfax’s temperature statistics in detail, including day and night variations and monthly averages. We’ll also compare the annual temperature to other cities in the United States of America.
Monthly Temperature Averages
In Fairfax, temperatures differ significantly between summer and winter months. Average maximum daytime temperatures range from a very warm 30°C in July, the warmest time of the year, to a chilly 6°C during cooler months like January. At night, minimum temperatures typically average around -4°C during these months.
The chart below illustrates the average maximum day and minimum night temperatures in Fairfax by month:
The lowest temperatures typically occur between 4 AM and 6 AM, while the peak temperatures are generally observed around 3 PM, coinciding with the sun’s strongest heating effect. July, the city’s warmest month, enjoys 279 hours of sunshine.
The chart below shows the average temperature throughout the year:
January, the city’s coldest month, receives about 71 mm of rainfall spread over roughly 10 days. For more information, please visit our Fairfax Precipitation page.
Annual Temperatures in the United States of America Compared
The map below shows the annual temperature across the United States of America. You can also select the different months in case you are interested in a specific month.
very warm
warm
pleasant
moderate
cold
very cold
Fairfax Temperatures Compared World Wide
Fairfax’s average annual maximum temperature is 19°C. Let’s compare this with some popular tourist destinations:
In Barcelona, Spain, the average annual temperature is around 21°C, resulting in warm summers and mild winters throughout the year.
In contrast, in Oslo, Norway, the average annual temperature is significantly lower at 10°C, with mild summers and cold winters.
In Seoul, South Korea, the average annual temperature is 18°C, featuring distinct seasons.
In Tokyo, Japan, the average annual temperature is 21°C, expect warmer summers and milder winters.
How does the temperature feel?
Humidity is an essential factor in how you experience temperature. When a warm period is accompanied by high humidity, it results in a higher perceived temperature. This is especially true when temperatures exceed 25°C, as it can cause greater discomfort.
On the other hand, in cooler months, especially when temperatures dip below 10°C, high humidity can intensify the cold. This makes the air feel much colder than it really is.
In Fairfax, during the coolest month, January, you will experience 62% humidity, which is considered high. This is accompanied by an average maximum temperature of 6°C. In the warmest month, July, the humidity is 67% combined with an average maximum temperature of 30°C, which creates a high-feel temperature. Explore our detailed page on humidity levels for further details.
How are these Temperatures Measured?
Generally, temperature data depicting climate is usually given over a 30-year average in order to reduce short-term fluctuations and reveal better long-term trends in climate conditions.
This temperature data is taken from land-based thermometers, ocean buoys, ships, and satellites. These measurements are transmitted to weather stations and climate centers around the globe where they are processed, averaged, and analyzed in order to monitor the trends and create climate models.
Temperatures in the Mountains
Although not all regions have mountains, elevated areas exhibit distinct temperature variations.
- Sun Exposure: Sunlit slopes tend to be warmer, while shaded areas remain cooler.
- Altitude Effects: Temperatures drop by approximately 6°C for every 1,000 meters of elevation, creating distinct microclimates.
For more detailed information about Fairfax’s weather, including monthly rainfall, sunshine hours, and humidity levels, visit our Fairfax climate page.
Current temperature in Fairfax
3 m/s
overcast and heavy rain
7 m/s
overcast and heavy rain
5 m/s
clear and no rain
