Average Weather In January For Denver, Colorado, USA

Location

This report describes the typical weather at the Denver International Airport (Denver, Colorado, United States) weather station over the course of an average January. It is based on the historical records from 1995 to 2012. Earlier records are either unavailable or unreliable.

Denver, Colorado has a cold semi-arid steppe climate. The area within 25 mi of this station is covered by grasslands (86%), built-up areas (10%), and croplands (3%).

Temperature

The month of January is characterized by essentially constant daily high temperatures, with daily highs around 43°F throughout the month, exceeding 59°F or dropping below 27°F only one day in ten.

Daily High and Low Temperature in January

The daily average low (blue) and high (red) temperature with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).
Daily low temperatures are around 20°F, falling below 6°F or exceeding 32°F only one day in ten.

Fraction of Time Spent in Various Temperature Bands in January

The average fraction of time spent in various temperature bands: frigid (below 15°F), freezing (15°F to 32°F), cold (32°F to 50°F), cool (50°F to 65°F), comfortable (65°F to 75°F), warm (75°F to 85°F), hot (85°F to 100°F) and sweltering (above 100°F).

Sun

Over the course of January, the length of the day is gradually increasing. The shortest day of the month is January 1 with 9:25 hours of daylight; the longest day is January 31 with 10:08 hours of daylight.

Daily Hours of Daylight and Twilight in January

The number of hours during which the Sun is visible (black line), with various degrees of daylight, twilight, and night, indicated by the color bands. From bottom (most yellow) to top (most gray): full daylight, solar twilight (Sun is visible but less than 6° from the horizon), civil twilight (Sun is not visible but is less than 6° below the horizon), nautical twilight (Sun is between 6° and 12° below the horizon), astronomical twilight (Sun is between 12° and 18° below the horizon), and full night.

The earliest sunrise is at 7:08am on January 31; the latest sunset is at 5:16pm on January 31; the latest sunrise is at 7:21am on January 4; the earliest sunset is at 4:45pm on January 1.

Daylight savings time is observed in 2012 but it neither starts nor ends in January, so the entire month is in standard time.

Daily Sunrise & Sunset with Twilight and Daylight Savings Time in January

The solar day over the course of the year 2012 . From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (solar, civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. The transitions to and from daylight savings time are indicated by the "DST" labels.

Clouds

The median cloud cover is 67% (partly cloudy) and does not vary substantially over the course of the month.

Median Cloud Cover in January

The median daily cloud cover (black line) with percentile bands (inner band from 40th to 60th percentile, outer band from 25th to 75th percentile).

On January 16, a representative day, the sky is clear or mostly clear 25% of the time, partly cloudy 25% of the time, and mostly cloudy or overcast 46% of the time.

Cloud Cover Types in January

The fraction of time spent in each of the five sky cover categories. From top (most blue) to bottom (most gray), the categories are clear, mostly clear, partly cloudy, mostly cloudy, and overcast. Pink indicates missing data. Outside of the United States clear skies are often reported ambiguously, leading them to be lumped in with the missing data.

Precipitation

The average probability that some form of precipitation will be observed in a given day is 25%, with little variation over the course of the month.

Probability of Precipitation at Some Point in the Day in January

The fraction of days in which various types of precipitation are observed. If more than one type of precipitation is reported in a given day, the more severe precipitation is counted. For example, if light rain is observed in the same day as a thunderstorm, that day counts towards the thunderstorm totals. The order of severity is from the top down in this graph, with the most severe at the bottom.

Throughout January, the most common forms of precipitation are light snow and moderate snow.

Light snow is the most severe precipitation observed during 77% of those days with precipitation. It is most likely around January 16, when it is observed during 20% of all days.

Moderate snow is the most severe precipitation observed during 14% of those days with precipitation. It is most likely around January 1, when it is observed during 4% of all days.

Types of Precipitation Throughout January

Relative frequency of various types of precipitation over the course of a typical January.

Snow

The likelihood of snow falling is highest around January 16, occurring in 24% of days.

Probability of Snow Fall Being Reported in a Given Day in January

Probability that snow will be reported at least once in a given day.

Accumulation at this location in January is unlikely. The chances of there being snow on the ground are highest around January 31, occurring 11% of the time.

Chance of at Least Some Snow on the Ground in January

The probability that there is snow on the ground.

The snow is typically at its deepest on January 20, with a median depth of 2.0"; the depth exceeds 2.7" only one year out of ten.

Snow Depth When there is Snow on the Ground in January

The median depth of snow during times when there is at least some snow on the ground, with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).

Humidity

The relative humidity typically ranges from 37% (comfortable) to 80% (humid) over the course of a typical January, rarely dropping below 15% (very dry) and reaching as high as 97% (very humid).

The air is driest around January 16, at which time the relative humidity drops below 46% (comfortable) three days out of four; it is most humid around January 27, rising above 71% (humid) three days out of four.

Relative Humidity in January

The average daily high (blue) and low (brown) relative humidity with percentile bands (inner bands from 25th to 75th percentile, outer bands from 10th to 90th percentile).

Dew Point

Dew point is often a better measure of how comfortable a person will find the weather than relative humidity because it more directly relates to whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid.

Over the course of a typical January, the dew point typically varies from 8°F (dry) to 21°F (dry) and is rarely below -4°F (dry) or above 29°F (dry).

Dew Point in January

The daily average low (blue) and high (red) dew point with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).

Wind

Over the course of January typical wind speeds vary from 0 mph to 17 mph (calm to moderate breeze), rarely exceeding 26 mph (strong breeze).

The highest average wind speed of 10 mph (gentle breeze) occurs around January 3, at which time the average daily maximum wind speed is 17 mph (moderate breeze).

The lowest average wind speed of 10 mph (gentle breeze) occurs around January 22, at which time the average daily maximum wind speed is 17 mph (moderate breeze).

Wind Speed in January

The average daily minimum (red), maximum (green), and average (black) wind speed with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).
The wind is most often out of the south west (19% of the time), south (18% of the time), west (12% of the time), and north (10% of the time).

Wind Directions in January

The fraction of time spent with the wind blowing from the various directions over the entire year. Values do not sum to 100% because the wind direction is undefined when the wind speed is zero.

Fraction of Time Spent with Various Wind Directions in January

The fraction of time spent with the wind blowing from the various directions on a daily basis. Stacked values do not always sum to 100% because the wind direction is undefined when the wind speed is zero.