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December Weather in Denver Colorado, United States

Daily high temperatures decrease by 4°F, from 49°F to 45°F, rarely falling below 27°F or exceeding 65°F. The lowest daily average high temperature is 44°F on December 29.

Daily low temperatures decrease by 4°F, from 26°F to 22°F, rarely falling below 6°F or exceeding 39°F. The lowest daily average low temperature is 22°F on December 29.

For reference, on July 9, the hottest day of the year, temperatures in Denver typically range from 62°F to 89°F, while on December 29, the coldest day of the year, they range from 22°F to 44°F.

Average High and Low Temperature in December in Denver

The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on December. 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 December in Denver

Average Hourly Temperature in December in DenverDec112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMNovJanfreezingfreezingvery coldcoldcool
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Kırıkkale, Turkey (6,354 miles away) is the far-away foreign place with temperatures most similar to Denver (view comparison).

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The month of December in Denver 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 clearest day of the month is December 25, with clear, mostly clear, or partly cloudy conditions 60% of the time.

For reference, on March 14, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 47%, while on September 12, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 75%.

Cloud Cover Categories in December in Denver

Cloud Cover Categories in December in DenverDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%NovJanDec 159%Dec 159%Dec 3160%Dec 3160%Dec 1159%Dec 1159%Dec 2160%Dec 2160%clearmostly clearpartly cloudymostly cloudyovercast
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Denver, the chance of a wet day over the course of December is essentially constant, remaining around 6% throughout.

For reference, the year's highest daily chance of a wet day is 31% on July 21, and its lowest chance is 6% on December 18.

Over the course of December in Denver, the chance of a day with only rain remains an essentially constant 2% 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 December in Denver

The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

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 December in Denver is essentially constant, remaining about 0.1 inches throughout, and rarely exceeding 0.4 inches or falling below -0.0 inches.

The lowest average 31-day accumulation is 0.1 inches on December 28.

Average Monthly Rainfall in December in Denver

Average Monthly Rainfall in December in DenverDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310.0 in0.0 in0.5 in0.5 in1.0 in1.0 in1.5 in1.5 in2.0 in2.0 in2.5 in2.5 inNovJanDec 280.1 inDec 280.1 inDec 10.2 inDec 10.2 inDec 110.1 inDec 110.1 in
The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average snowfall.

Snowfall

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day snowfall during December in Denver is essentially constant, remaining about 2.3 inches throughout, and rarely exceeding 5.4 inches or falling below 0.1 inches.

The highest average 31-day accumulation is 2.4 inches on December 15.

Average Monthly Snowfall in December in Denver

The average snowfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average rainfall.

Over the course of December in Denver, the length of the day is essentially constant. The shortest day of the month is December 20, with 9 hours, 21 minutes of daylight and the longest day is December 1, with 9 hours, 33 minutes of daylight.

Hours of Daylight and Twilight in December in Denver

Hours of Daylight and Twilight in December in DenverDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrNovJanDec 219 hr, 21 minDec 219 hr, 21 minnightnightdaydayDec 19 hr, 33 minDec 19 hr, 33 min
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise of the month in Denver is 7:02 AM on December 1 and the latest sunrise is 19 minutes later at 7:20 AM on December 31.

The earliest sunset is 4:35 PM on December 6 and the latest sunset is 11 minutes later at 4:45 PM on December 31.

Daylight saving time is observed in Denver during 2024, but it neither starts nor ends during December, so the entire month is in daylight saving time.

For reference, on June 20, the longest day of the year, the Sun rises at 5:32 AM and sets 14 hours, 59 minutes later, at 8:31 PM, while on December 21, the shortest day of the year, it rises at 7:17 AM and sets 9 hours, 21 minutes later, at 4:39 PM.

Sunrise & Sunset with Twilight and Daylight Saving Time in December in Denver

Sunrise & Sunset with Twilight and Daylight Saving Time in December in DenverDec112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMNovJan7:02 AM7:02 AMDec 14:35 PMDec 14:35 PM7:20 AM7:20 AMDec 314:45 PMDec 314:45 PM7:11 AM7:11 AMDec 114:35 PMDec 114:35 PM7:17 AM7:17 AMDec 214:39 PMDec 214:39 PMSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of December. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

Solar Elevation and Azimuth in December in Denver

Solar Elevation and Azimuth in December in DenverDec112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMNovJan0010102020001010202030
northeastsouthwest
Solar elevation and azimuth over the course of December 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

The figure below presents a compact representation of key lunar data for December 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

Moon Rise, Set & Phases in December in Denver

Moon Rise, Set & Phases in December in DenverDec112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMNovJanNov 16:48 AMNov 16:48 AMNov 152:29 PMNov 152:29 PMNov 3011:22 PMNov 3011:22 PMDec 152:02 AMDec 152:02 AMDec 303:28 PMDec 303:28 PMJan 133:28 PMJan 133:28 PMJan 295:37 AMJan 295:37 AM7:42 AM7:42 AM5:51 PM5:51 PM4:23 PM4:23 PM7:56 AM7:56 AM6:40 AM6:40 AM3:56 PM3:56 PM3:44 PM3:44 PM7:55 AM7:55 AM7:32 AM7:32 AM4:21 PM4:21 PM4:40 PM4:40 PM8:14 AM8:14 AM7:36 AM7:36 AM5:36 PM5:36 PM
The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.
Dec 2024IlluminationMoonriseMoonsetMoonriseMeridian PassingDistance
1
0%7:44 AMSE4:39 PMSW-12:11 PMS245,200 mi
2
3%8:45 AMSE5:31 PMSW-1:08 PMS243,111 mi
3
7%9:40 AMSE6:33 PMSW-2:06 PMS240,975 mi
4
14%10:26 AMSE7:40 PMWSW-3:03 PMS238,828 mi
5
22%11:04 AMESE8:52 PMWSW-3:58 PMS236,688 mi
6
32%11:36 AMESE10:03 PMWSW-4:49 PMS234,575 mi
7
43%12:03 PMESE11:15 PMWSW-5:38 PMS232,526 mi
8
50%12:28 PME--6:25 PMS230,618 mi
9
66%-12:26 AMW12:52 PME7:12 PMS228,968 mi
10
77%-1:38 AMW1:16 PME8:01 PMS227,732 mi
11
87%-2:53 AMWNW1:44 PMENE8:52 PMS227,084 mi
12
94%-4:09 AMWNW2:16 PMENE9:47 PMS227,183 mi
13
98%-5:28 AMWNW2:55 PMENE10:46 PMS228,135 mi
14
100%-6:45 AMNW3:44 PMNE11:48 PMS229,951 mi
15
100%-7:55 AMNW4:44 PMNE--
16
99%-8:55 AMNW5:51 PMNE12:51 AMS232,532 mi
17
95%-9:42 AMNW7:02 PMENE1:50 AMS235,671 mi
18
89%-10:18 AMWNW8:11 PMENE2:45 AMS239,092 mi
19
82%-10:48 AMWNW9:18 PMENE3:34 AMS242,497 mi
20
73%-11:12 AMWNW10:21 PMENE4:19 AMS245,606 mi
21
64%-11:33 AMW11:22 PME5:00 AMS248,183 mi
22
50%-11:53 AMW-5:39 AMS250,052 mi
23
44%12:21 AME12:12 PMW-6:18 AMS251,106 mi
24
35%1:20 AME12:32 PMWSW-6:57 AMS251,306 mi
25
26%2:20 AMESE12:55 PMWSW-7:38 AMS250,684 mi
26
18%3:22 AMESE1:21 PMWSW-8:22 AMS249,333 mi
27
11%4:26 AMESE1:53 PMWSW-9:10 AMS247,395 mi
28
5%5:31 AMSE2:33 PMSW-10:02 AMS245,052 mi
29
2%6:34 AMSE3:22 PMSW-10:58 AMS242,505 mi
30
0%7:32 AMSE4:21 PMSW-11:57 AMS239,952 mi
31
1%8:22 AMSE5:29 PMSW-12:56 PMS237,565 mi

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 in Denver is essentially constant during December, remaining around 0% throughout.

For reference, on July 14, the muggiest day of the year, there are muggy conditions 0% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.

Humidity Comfort Levels in December in Denver

Humidity Comfort Levels in December in DenverDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%NovJanDec 10%Dec 10%Dec 310%Dec 310%Dec 110%Dec 110%Dec 210%Dec 210%drydry
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

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 in Denver is gradually increasing during December, increasing from 8.6 miles per hour to 9.2 miles per hour over the course of the month.

For reference, on January 17, the windiest day of the year, the daily average wind speed is 9.7 miles per hour, while on August 18, the calmest day of the year, the daily average wind speed is 6.9 miles per hour.

Average Wind Speed in December in Denver

The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The hourly average wind direction in Denver throughout December is predominantly from the west, with a peak proportion of 65% on December 31.

Wind Direction in December in Denver

Wind Direction in December in DenverDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%20%80%40%60%60%40%80%20%100%0%NovJanwestnortheastsouth
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

The growing season in Denver typically lasts for 5.5 months (169 days), from around April 26 to around October 12, rarely starting before April 5 or after May 14, and rarely ending before September 22 or after November 1.

The month of December in Denver is reliably fully outside of the growing season.

Time Spent in Various Temperature Bands and the Growing Season in December in Denver

Time Spent in Various Temperature Bands and the Growing Season in December in DenverDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%NovJan0%Dec 160%Dec 16Nov 110%Nov 110%frigidfreezingvery coldcoldcoolcomfortable
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

The average accumulated growing degree days in Denver are essentially constant during December, remaining within 9°F of 3,328°F throughout.

Growing Degree Days in December in Denver

Growing Degree Days in December in DenverDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031312,900°F2,900°F3,000°F3,000°F3,100°F3,100°F3,200°F3,200°F3,300°F3,300°F3,400°F3,400°F3,500°F3,500°F3,600°F3,600°FNovJanDec 13,319°FDec 13,319°FDec 313,337°FDec 313,337°FDec 113,328°FDec 113,328°FDec 213,334°FDec 213,334°F
The average growing degree days accumulated over the course of December, with 25th to 75th and 10th to 90th percentile bands.

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 in Denver is essentially constant during December, remaining within 0.1 kWh of 2.5 kWh throughout.

The lowest average daily incident shortwave solar energy during December is 2.4 kWh on December 21.

Average Daily Incident Shortwave Solar Energy in December in Denver

Average Daily Incident Shortwave Solar Energy in December in DenverDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310.0 kWh0.0 kWh0.5 kWh0.5 kWh1.0 kWh1.0 kWh1.5 kWh1.5 kWh2.0 kWh2.0 kWh2.5 kWh2.5 kWh3.0 kWh3.0 kWh3.5 kWh3.5 kWh4.0 kWh4.0 kWh4.5 kWh4.5 kWhNovJanDec 212.4 kWhDec 212.4 kWhDec 12.6 kWhDec 12.6 kWhDec 312.5 kWhDec 312.5 kWhDec 112.5 kWhDec 112.5 kWh
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

For the purposes of this report, the geographical coordinates of Denver are 39.739 deg latitude, -104.985 deg longitude, and 5,272 ft elevation.

The topography within 2 miles of Denver contains only modest variations in elevation, with a maximum elevation change of 243 feet and an average elevation above sea level of 5,248 feet. Within 10 miles contains only modest variations in elevation (1,562 feet). Within 50 miles contains very significant variations in elevation (9,649 feet).

The area within 2 miles of Denver is covered by shrubs (60%) and artificial surfaces (38%), within 10 miles by artificial surfaces (61%) and shrubs (32%), and within 50 miles by grassland (33%) and trees (28%).

This report illustrates the typical weather in Denver, 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

There are 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Denver.

For each station, the records are corrected for the elevation difference between that station and Denver according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

The estimated value at Denver is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Denver and a given station.

The stations contributing to this reconstruction are:

To get a sense of how much these sources agree with each other, you can view a comparison of Denver and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , 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 airports and weather stations are provided by AskGeo.com .

Maps are © OpenStreetMap contributors.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.

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