Average Weather in December in La Mesa Mexico
Daily high temperatures decrease by 4°F, from 67°F to 64°F, rarely falling below 53°F or exceeding 77°F. The lowest daily average high temperature is 63°F on December 26.
Daily low temperatures decrease by 2°F, from 38°F to 35°F, rarely falling below 26°F or exceeding 47°F.
For reference, on June 19, the hottest day of the year, temperatures in La Mesa typically range from 63°F to 95°F, while on January 5, the coldest day of the year, they range from 35°F to 64°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
San Juan, Argentina (5,152 miles away); Gharyan, Libya (6,740 miles); and Narromine, Australia (7,906 miles) are the far-away foreign places with temperatures most similar to La Mesa (view comparison).
The month of December in La Mesa experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 33% to 37%. The highest chance of overcast or mostly cloudy conditions is 37% on December 28.
The clearest day of the month is December 1, with clear, mostly clear, or partly cloudy conditions 67% of the time.
For reference, on July 30, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 52%, while on June 9, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 85%.
Cloud Cover Categories in December
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In La Mesa, the chance of a wet day over the course of December is essentially constant, remaining around 11% throughout.
For reference, the year's highest daily chance of a wet day is 50% on August 4, and its lowest chance is 2% on May 23.
Over the course of December in La Mesa, the chance of a day with only rain remains an essentially constant 10% 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 0% throughout.
Probability of Precipitation in December
The average sliding 31-day rainfall during December in La Mesa is essentially constant, remaining about 0.9 inches throughout, and rarely exceeding 2.4 inches.
The highest average 31-day accumulation is 1.0 inches on December 17.
Average Monthly Rainfall in December
Over the course of December in La Mesa, the length of the day is essentially constant. The shortest day of the month is December 21, with 10 hours, 7 minutes of daylight and the longest day is December 1, with 10 hours, 16 minutes of daylight.
Hours of Daylight and Twilight in December
The earliest sunrise of the month in La Mesa is 7:04 AM on December 1 and the latest sunrise is 18 minutes later at 7:22 AM on December 31.
The earliest sunset is 5:21 PM on December 3 and the latest sunset is 11 minutes later at 5:31 PM on December 31.
Daylight saving time is not observed in La Mesa during 2018.
For reference, on June 21, the longest day of the year, the Sun rises at 5:20 AM and sets 14 hours, 11 minutes later, at 7:31 PM, while on December 21, the shortest day of the year, it rises at 7:18 AM and sets 10 hours, 7 minutes later, at 5:25 PM.
Sunrise & Sunset with Twilight in December
The chance that a given day will be muggy in La Mesa is essentially constant during December, remaining around 0% throughout.
For reference, on August 6, the muggiest day of the year, there are muggy conditions 23% 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 La Mesa is essentially constant during December, remaining within 0.1 miles per hour of 8.7 miles per hour throughout.
For reference, on April 30, the windiest day of the year, the daily average wind speed is 9.4 miles per hour, while on August 8, the calmest day of the year, the daily average wind speed is 5.5 miles per hour.
The highest daily average wind speed during December is 8.8 miles per hour on December 30.
Average Wind Speed in December
Wind Direction in December
The growing season in La Mesa typically lasts for 8.0 months (243 days), from around March 18 to around November 16, rarely starting before February 19 or after April 19, and rarely ending before October 28 or after December 8.
The month of December in La Mesa is more likely than not fully outside of the growing season, with the chance that a given day is in the growing season decreasing from 20% 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 La Mesa are gradually increasing during December, increasing by 122°F, from 5,339°F to 5,461°F, over the course of the month.
Growing Degree Days in December
The average daily incident shortwave solar energy in La Mesa is essentially constant during December, remaining within 0.1 kWh of 3.6 kWh throughout.
The lowest average daily incident shortwave solar energy during December is 3.5 kWh on December 24.
Average Daily Incident Shortwave Solar Energy in December
For the purposes of this report, the geographical coordinates of La Mesa are 31.160 deg latitude, -110.974 deg longitude, and 4,019 ft elevation.
The topography within 2 miles of La Mesa contains significant variations in elevation, with a maximum elevation change of 541 feet and an average elevation above sea level of 3,960 feet. Within 10 miles contains significant variations in elevation (3,366 feet). Within 50 miles also contains extreme variations in elevation (7,766 feet).
The area within 2 miles of La Mesa is covered by shrubs (83%) and grassland (17%), within 10 miles by shrubs (80%) and grassland (11%), and within 50 miles by shrubs (74%) and grassland (19%).
This report illustrates the typical weather in La Mesa 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 is only a single weather station, Nogales International Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of La Mesa.
At a distance of 32 kilometers from La Mesa, closer than our threshold of 150 kilometers, this station is deemed sufficiently nearby to be relied upon as our primary source for temperature and dew point records.
The station records are corrected for the elevation difference between the station and La Mesa according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
Please note that the station records themselves may additionally have been back-filled using other nearby stations or the MERRA-2 reanalysis.
Time zones for aiports and weather stations are provided by AskGeo.com .