Average Weather in January at Denver International Airport Colorado, United States
At Denver International Airport, the month of January is characterized by gradually rising daily high temperatures, with daily highs increasing by 2°F, from 42°F to 44°F over the course of the month, and rarely exceeding 59°F or dropping below 25°F.
Daily low temperatures are around 21°F, rarely falling below 3°F or exceeding 34°F.
For reference, on July 13, the hottest day of the year, temperatures at Denver International Airport typically range from 61°F to 88°F, while on December 30, the coldest day of the year, they range from 20°F to 42°F.
Average High and Low Temperature in January
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on January. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature in January
The month of January at Denver International Airport experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 41% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 39% on January 8.
The clearest day of the month is January 8, with clear, mostly clear, or partly cloudy conditions 61% of the time.
For reference, on March 4, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 46%, while on September 13, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 75%.
Cloud Cover in January
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Denver International Airport, the chance of a wet day over the course of January is essentially constant, remaining around 6% throughout.
For reference, the year's highest daily chance of a wet day is 29% on July 22, and its lowest chance is 5% on December 19.
Over the course of January at Denver International Airport, the chance of a day with only rain remains an essentially constant 1% throughout, the chance of a day with mixed snow and rain remains an essentially constant 1% throughout, and the chance of a day with only snow remains an essentially constant 4% throughout.
Probability of Precipitation in January
To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day rainfall during January at Denver International Airport is essentially constant, remaining about 0.1 inches throughout, and rarely exceeding 0.2 inches or falling below -0.0 inches.
The lowest average 31-day accumulation is 0.0 inches on January 14.
Average Monthly Rainfall in January
We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. As with rainfall, we consider the liquid-equivalent snowfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day liquid-equivalent snowfall during January at Denver International Airport is essentially constant, remaining about 0.2 inches throughout, and rarely exceeding 0.5 inches or falling to 0.0 inches.
The lowest average 31-day liquid-equivalent accumulation is 0.2 inches on January 23.
Average Monthly Liquid-Equivalent Snowfall in January
Over the course of January at Denver International Airport, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 45 minutes, implying an average daily increase of 1 minute, 30 seconds, and weekly increase of 10 minutes, 32 seconds.
The shortest day of the month is January 1, with 9 hours, 25 minutes of daylight and the longest day is January 31, with 10 hours, 10 minutes of daylight.
Hours of Daylight and Twilight in January
The latest sunrise of the month at Denver International Airport is 7:20 AM on January 5 and the earliest sunrise is 13 minutes earlier at 7:07 AM on January 31.
The earliest sunset is 4:44 PM on January 1 and the latest sunset is 32 minutes later at 5:17 PM on January 31.
Daylight saving time is observed at Denver International Airport during 2017, but it neither starts nor ends during January, so the entire month is in standard time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:30 AM and sets 15 hours, 0 minutes later, at 8:30 PM, while on December 21, the shortest day of the year, it rises at 7:16 AM and sets 9 hours, 21 minutes later, at 4:37 PM.
Sunrise & Sunset with Twilight in January
We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.
The chance that a given day will be muggy at Denver International Airport is essentially constant during January, remaining around 0% throughout.
For reference, on July 24, the muggiest day of the year, there are muggy conditions 0% of the time, while on January 1, the leasy muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in January
This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.
The average hourly wind speed at Denver International Airport is essentially constant during January, remaining within 0.1 miles per hour of 4.7 miles per hour throughout.
For reference, on April 1, the windiest day of the year, the daily average wind speed is 5.1 miles per hour, while on August 19, the calmest day of the year, the daily average wind speed is 3.7 miles per hour.
The highest daily average wind speed during January is 4.9 miles per hour on January 18.
Average Wind Speed in January
Wind Direction in January
This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.
The average daily incident shortwave solar energy at Denver International Airport is gradually increasing during January, rising by 0.7 kWh, from 2.5 kWh to 3.1 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in January
For the purposes of this report, the geographical coordinates of Denver International Airport are 39.859 deg latitude, -104.673 deg longitude, and 5,335 ft elevation.
The topography within 2 miles of Denver International Airport contains only modest variations in elevation, with a maximum elevation change of 210 feet and an average elevation above sea level of 5,342 feet. Within 10 miles contains only modest variations in elevation (682 feet). Within 50 miles contains significant variations in elevation (7,356 feet).
The area within 2 miles of Denver International Airport is covered by shrubs (92%), within 10 miles by shrubs (37%) and grassland (34%), and within 50 miles by grassland (45%) and cropland (21%).
This report illustrates the typical weather at Denver International Airport year round, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
Denver International Airport has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required.
In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations.
The stations on which we may fall back include but are not limited to Buckley Air Force Base; Denver / Stapleton International, Co.; Arapahoe County Airport; Erie Municipal; Rocky Mountain Metropolitan Airport; Boulder Municipal Airport; Greeley-Weld County Airport; and Vance Brand Airport.
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , by Jean Meeus.
All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.
Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.
Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.
Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .
Time zones for aiports and weather stations are provided by AskGeo.com .
Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.