December Weather at London Weather Centre United Kingdom
Daily high temperatures decrease by 2°F, from 50°F to 48°F, rarely falling below 38°F or exceeding 58°F.
Daily low temperatures are around 41°F, rarely falling below 31°F or exceeding 50°F.
For reference, on August 2, the hottest day of the year, temperatures at London Weather Centre typically range from 60°F to 74°F, while on February 7, the coldest day of the year, they range from 39°F to 47°F.
Average High and Low Temperature in December at London Weather Centre
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 at London Weather Centre
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 month of December at London Weather Centre experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 72% throughout the month. The highest chance of overcast or mostly cloudy conditions is 74% on December 27.
The clearest day of the month is December 3, with clear, mostly clear, or partly cloudy conditions 29% of the time.
For reference, on December 27, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 74%, while on July 15, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 58%.
Cloud Cover Categories in December at London Weather Centre
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At London Weather Centre, the chance of a wet day over the course of December is gradually increasing, starting the month at 30% and ending it at 32%.
For reference, the year's highest daily chance of a wet day is 32% on December 30, and its lowest chance is 20% on April 28.
Probability of Precipitation in December at London Weather Centre
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 at London Weather Centre is essentially constant, remaining about 2.0 inches throughout, and rarely exceeding 3.5 inches or falling below 0.5 inches.
Average Monthly Rainfall in December at London Weather Centre
Over the course of December at London Weather Centre, the length of the day is gradually decreasing. From the start to the end of the month, the length of the day decreases by 16 minutes, implying an average daily decrease of 32 seconds, and weekly decrease of 3 minutes, 43 seconds.
The shortest day of the month is December 21, with 7 hours, 50 minutes of daylight and the longest day is December 1, with 8 hours, 11 minutes of daylight.
Hours of Daylight and Twilight in December at London Weather Centre
The earliest sunrise of the month at London Weather Centre is 7:44 AM on December 1 and the latest sunrise is 22 minutes later at 8:06 AM on December 30.
The earliest sunset is 3:51 PM on December 12 and the latest sunset is 10 minutes later at 4:01 PM on December 31.
Daylight saving time is observed at London Weather Centre during 2021, but it neither starts nor ends during December, so the entire month is in standard time.
For reference, on June 21, the longest day of the year, the Sun rises at 4:43 AM and sets 16 hours, 39 minutes later, at 9:21 PM, while on December 21, the shortest day of the year, it rises at 8:03 AM and sets 7 hours, 50 minutes later, at 3:53 PM.
Sunrise & Sunset with Twilight in December at London Weather Centre
The figure below presents a compact representation of key lunar data for December 2021. 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 at London Weather Centre
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 London Weather Centre is essentially constant during December, remaining around 0% throughout.
For reference, on August 11, the muggiest day of the year, there are muggy conditions 1% 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 at London Weather Centre
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
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 London Weather Centre is increasing during December, increasing from 11.9 miles per hour to 13.1 miles per hour over the course of the month.
For reference, on January 3, the windiest day of the year, the daily average wind speed is 13.3 miles per hour, while on August 3, the calmest day of the year, the daily average wind speed is 9.6 miles per hour.
Average Wind Speed in December at London Weather Centre
The hourly average wind direction at London Weather Centre throughout December is predominantly from the west, with a peak proportion of 41% on December 31.
Wind Direction in December at London Weather Centre
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 at London Weather Centre typically lasts for 9.8 months (297 days), from around February 22 to around December 17, rarely starting after March 27, or ending before November 14.
During December at London Weather Centre, the chance that a given day is within the growing season is rapidly decreasing falling from 74% to 25% over the course of the month.
Time Spent in Various Temperature Bands and the Growing Season in December at London Weather Centre
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
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 at London Weather Centre are essentially constant during December, remaining within 14°F of 2,303°F throughout.
Growing Degree Days in December at London Weather Centre
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 London Weather Centre is essentially constant during December, remaining within 0.1 kWh of 0.7 kWh throughout.
The lowest average daily incident shortwave solar energy during December is 0.6 kWh on December 27.
Average Daily Incident Shortwave Solar Energy in December at London Weather Centre
For the purposes of this report, the geographical coordinates of London Weather Centre are 51.517 deg latitude, -0.117 deg longitude, and 105 ft elevation.
The topography within 2 miles of London Weather Centre contains only modest variations in elevation, with a maximum elevation change of 171 feet and an average elevation above sea level of 80 feet. Within 10 miles contains only modest variations in elevation (495 feet). Within 50 miles contains significant variations in elevation (1,027 feet).
The area within 2 miles of London Weather Centre is covered by artificial surfaces (95%), within 10 miles by artificial surfaces (96%), and within 50 miles by cropland (40%) and grassland (26%).
This report illustrates the typical weather at London Weather Centre, 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
London Weather Centre 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 London City Airport, RAF Northolt, London Heathrow Airport, London Gatwick Airport, Luton Airport, Stansted Airport, Bracknell / Beaufort Park, and Brighton Shoreham Airport.
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 © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.
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.