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Average Weather in December in Sant Julià de Cerdanyola Spain

Daily low temperatures decrease by 3°F, from 30°F to 28°F, rarely falling below 19°F or exceeding 38°F.

For reference, on July 30, the hottest day of the year, temperatures in Sant Julià de Cerdanyola typically range from 56°F to 78°F, while on January 15, the coldest day of the year, they range from 27°F to 44°F.

Average High and Low Temperature in December

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

Average Hourly Temperature in December in Sant Julià de Cerdanyola18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM4 AM8 AM12 PM4 PM8 PM12 AMNovJanfreezingvery coldcoldcool
The average hourly temperature, color coded into bands: 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 shaded overlays indicate night and civil twilight.

Chester, California, United States (5,724 miles away) and Pine Mountain Club, California, United States (5,945 miles) are the far-away foreign places with temperatures most similar to Sant Julià de Cerdanyola (view comparison).

Clouds

The month of December in Sant Julià de Cerdanyola experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 47% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 46% on December 24.

The clearest day of the month is December 24, with clear, mostly clear, or partly cloudy conditions 54% of the time.

For reference, on October 29, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 53%, while on July 20, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 79%.

Cloud Cover Categories in December

Cloud Cover Categories in December in Sant Julià de Cerdanyola1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%NovJanOct 2947%Oct 2947%Dec 153%Dec 153%Dec 3153%Dec 3153%Dec 1152%Dec 1152%Dec 2154%Dec 2154%clearmostly clearpartly cloudymostly cloudyovercast
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Sant Julià de Cerdanyola, the chance of a wet day over the course of December is gradually decreasing, starting the month at 17% and ending it at 13%.

For reference, the year's highest daily chance of a wet day is 24% on May 8, and its lowest chance is 13% on July 14.

Over the course of December in Sant Julià de Cerdanyola, the chance of a day with only rain decreases from 15% to 9%, the chance of a day with mixed snow and rain remains an essentially constant 2% throughout, and the chance of a day with only snow remains an essentially constant 2% throughout.

Probability of Precipitation in December

Probability of Precipitation in December in Sant Julià de Cerdanyola1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%2%4%6%8%10%12%14%16%18%20%22%NovJanDec 2813%Dec 2813%Dec 117%Dec 117%Dec 1116%Dec 1116%snowmixedrain
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 Sant Julià de Cerdanyola is decreasing, starting the month at 1.2 inches, when it rarely exceeds 2.9 inches or falls below 0.2 inches, and ending the month at 0.6 inches, when it rarely exceeds 1.7 inches or falls below 0.1 inches.

Average Monthly Rainfall in December

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 liquid-equivalent snowfall.

Snowfall

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 December in Sant Julià de Cerdanyola is essentially constant, remaining about 0.2 inches throughout, and rarely exceeding 0.6 inches or falling to 0.0 inches.

Average Monthly Liquid-Equivalent Snowfall in December

Average Monthly Liquid-Equivalent Snowfall in December in Sant Julià de Cerdanyola1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310.0 in0.2 in0.4 in0.6 in0.8 in1.0 in1.2 in1.4 in1.6 in1.8 inNovJanDec 10.1 inDec 10.1 inDec 310.2 inDec 310.2 inDec 110.1 inDec 110.1 inDec 210.2 inDec 210.2 in
The average liquid-equivalent 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.

Sun

Over the course of December in Sant Julià de Cerdanyola, the length of the day is essentially constant. The shortest day of the month is December 21, with 9 hours, 5 minutes of daylight and the longest day is December 1, with 9 hours, 20 minutes of daylight.

Hours of Daylight and Twilight in December

Hours of Daylight and Twilight in December in Sant Julià de Cerdanyola1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrNovJanDec 219 hr, 5 minDec 219 hr, 5 minnightnightdaydayDec 19 hr, 20 minDec 19 hr, 20 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 Sant Julià de Cerdanyola is 8:01 AM on December 1 and the latest sunrise is 20 minutes later at 8:21 AM on December 31.

The earliest sunset is 5:20 PM on December 8 and the latest sunset is 10 minutes later at 5:30 PM on December 31.

Daylight saving time is observed in Sant Julià de Cerdanyola during 2017, 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 6:16 AM and sets 15 hours, 16 minutes later, at 9:32 PM, while on December 21, the shortest day of the year, it rises at 8:17 AM and sets 9 hours, 5 minutes later, at 5:23 PM.

Sunrise & Sunset with Twilight in December

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.

Humidity

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 Sant Julià de Cerdanyola is essentially constant during December, remaining around 0% throughout.

For reference, on August 15, 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

The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.

Wind

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 Sant Julià de Cerdanyola is essentially constant during December, remaining within 0.2 miles per hour of 6.3 miles per hour throughout.

For reference, on April 5, the windiest day of the year, the daily average wind speed is 6.9 miles per hour, while on August 27, the calmest day of the year, the daily average wind speed is 4.5 miles per hour.

Average Wind Speed in December

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 Sant Julià de Cerdanyola throughout December is predominantly from the north, with a peak proportion of 50% on December 25.

Wind Direction in December

Wind Direction in December in Sant Julià de Cerdanyola1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%NovJanwestnorthsoutheast
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Water Temperature

Sant Julià de Cerdanyola is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average surface water temperature in Sant Julià de Cerdanyola is gradually decreasing during December, falling by 3°F, from 60°F to 57°F, over the course of the month.

Average Water Temperature in December

The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

Growing Season

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 Sant Julià de Cerdanyola typically lasts for 6.0 months (185 days), from around April 25 to around October 27, rarely starting before April 1 or after May 16, and rarely ending before October 7 or after November 16.

The month of December in Sant Julià de Cerdanyola is very likely fully outside of the growing season, with the chance that a given day is in the growing season gradually decreasing from 3% to 0% over the course of the month.

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

Time Spent in Various Temperature Bands and the Growing Season in December in Sant Julià de Cerdanyola1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%NovJanDec 13%Dec 13%Dec 310%Dec 310%Dec 112%Dec 112%Dec 211%Dec 211%Nov 1610%Nov 1610%freezingvery coldcoldcool
The percentage of time spent in various temperature bands: 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 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 Sant Julià de Cerdanyola are essentially constant during December, remaining within 2°F of 2,090°F throughout.

Growing Degree Days in December

The average growing degree days accumulated over the course of December, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

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 Sant Julià de Cerdanyola is essentially constant during December, remaining within 0.1 kWh of 2.0 kWh throughout.

The lowest average daily incident shortwave solar energy during December is 1.9 kWh on December 19.

Average Daily Incident Shortwave Solar Energy in December

Average Daily Incident Shortwave Solar Energy in December in Sant Julià de Cerdanyola1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310.0 kWh0.5 kWh1.0 kWh1.5 kWh2.0 kWh2.5 kWh3.0 kWh3.5 kWh4.0 kWhNovJanDec 191.9 kWhDec 191.9 kWhDec 12.1 kWhDec 12.1 kWhDec 312.0 kWhDec 312.0 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.

Topography

For the purposes of this report, the geographical coordinates of Sant Julià de Cerdanyola are 42.223 deg latitude, 1.893 deg longitude, and 3,412 ft elevation.

The topography within 2 miles of Sant Julià de Cerdanyola contains large variations in elevation, with a maximum elevation change of 2,562 feet and an average elevation above sea level of 3,275 feet. Within 10 miles contains large variations in elevation (6,699 feet). Within 50 miles also contains extreme variations in elevation (9,997 feet).

The area within 2 miles of Sant Julià de Cerdanyola is covered by trees (77%) and cropland (11%), within 10 miles by trees (73%) and grassland (13%), and within 50 miles by trees (56%) and cropland (19%).

Data Sources

This report illustrates the typical weather in Sant Julià de Cerdanyola 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

There are 5 weather stations near enough to contribute to our estimation of the temperature and dew point in Sant Julià de Cerdanyola.

For each station, the records are corrected for the elevation difference between that station and Sant Julià de Cerdanyola 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 Sant Julià de Cerdanyola is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Sant Julià de Cerdanyola and a given station.

The stations contributing to this reconstruction are: Aeroport de Girona - Costa Brava (24%, 80 kilometers, southeast); Perpignan–Rivesaltes Airport (19%, 99 kilometers, northeast); Barcelona–El Prat Airport (18%, 104 kilometers, south); Saint-Girons - Antichan (22%, 109 kilometers, northwest); and Carcassonne-Salvaza (18%, 116 kilometers, north).

Other Data

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.

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.