Average Weather in December in Sant Julià de Cerdanyola Spain
Daily high temperatures decrease by 3°F, from 47°F to 44°F, rarely falling below 36°F or exceeding 55°F.
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 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
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).
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
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
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
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
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
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 9 and the latest sunset is 10 minutes later at 5:29 PM on December 31.
Daylight saving time is observed in Sant Julià de Cerdanyola during 2018, 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 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 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
Wind Direction in December
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 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
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 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
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%).
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).
Time zones for aiports and weather stations are provided by AskGeo.com .