Average Weather in January in Los Angeles California, United States
In Los Angeles, the month of January is characterized by essentially constant daily high temperatures, with daily highs around 68°F throughout the month, rarely exceeding 79°F or dropping below 58°F.
Daily low temperatures are around 48°F, rarely falling below 42°F or exceeding 55°F.
For reference, on August 25, the hottest day of the year, temperatures in Los Angeles typically range from 66°F to 85°F, while on December 25, the coldest day of the year, they range from 48°F to 67°F.
Average High and Low Temperature in January
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on January. 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 January
The month of January in Los Angeles experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 39% throughout the month.
The clearest day of the month is January 21, with clear, mostly clear, or partly cloudy conditions 62% of the time.
For reference, on February 22, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 43%, while on September 7, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 91%.
Cloud Cover in January
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Los Angeles, the chance of a wet day over the course of January is essentially constant, remaining around 17% throughout.
For reference, the year's highest daily chance of a wet day is 21% on February 20, and its lowest chance is 0% on July 17.
Probability of Precipitation in January
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 January in Los Angeles is essentially constant, remaining about 2.8 inches throughout, and rarely exceeding 7.7 inches or falling below 0.1 inches.
Average Monthly Rainfall in January
Over the course of January in Los Angeles, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 36 minutes, implying an average daily increase of 1 minute, 12 seconds, and weekly increase of 8 minutes, 24 seconds.
The shortest day of the month is January 1, with 9 hours, 56 minutes of daylight and the longest day is January 31, with 10 hours, 32 minutes of daylight.
Hours of Daylight and Twilight in January
The latest sunrise of the month in Los Angeles is 6:59 AM on January 7 and the earliest sunrise is 9 minutes earlier at 6:50 AM on January 31.
The earliest sunset is 4:55 PM on January 1 and the latest sunset is 28 minutes later at 5:22 PM on January 31.
Daylight saving time is observed in Los Angeles during 2017, but it neither starts nor ends during January, so the entire month is in standard time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:42 AM and sets 14 hours, 26 minutes later, at 8:07 PM, while on December 21, the shortest day of the year, it rises at 6:54 AM and sets 9 hours, 53 minutes later, at 4:47 PM.
Sunrise & Sunset with Twilight in January
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 Los Angeles is essentially constant during January, remaining around 0% throughout.
For reference, on August 4, the muggiest day of the year, there are muggy conditions 7% of the time, while on November 10, the leasy muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in January
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 Los Angeles is essentially constant during January, remaining within 0.2 miles per hour of 4.5 miles per hour throughout.
For reference, on December 31, the windiest day of the year, the daily average wind speed is 4.7 miles per hour, while on August 13, the calmest day of the year, the daily average wind speed is 2.8 miles per hour.
Average Wind Speed in January
Wind Direction in January
Los Angeles 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 Los Angeles is essentially constant during January, remaining around 59°F throughout.
Average Water Temperature in January
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 Los Angeles is gradually increasing during January, rising by 0.7 kWh, from 3.0 kWh to 3.7 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in January
For the purposes of this report, the geographical coordinates of Los Angeles are 34.052 deg latitude, -118.244 deg longitude, and 295 ft elevation.
The topography within 2 miles of Los Angeles contains only modest variations in elevation, with a maximum elevation change of 400 feet and an average elevation above sea level of 310 feet. Within 10 miles contains only modest variations in elevation (2,602 feet). Within 50 miles contains large variations in elevation (10,062 feet).
The area within 2 miles of Los Angeles is covered by artificial surfaces (100%), within 10 miles by artificial surfaces (94%), and within 50 miles by shrubs (37%) and water (28%).
This report illustrates the typical weather in Los Angeles 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 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Los Angeles.
For each station, the records are corrected for the elevation difference between that station and Los Angeles 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 Los Angeles is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Los Angeles and a given station.
The stations contributing to this reconstruction are: Los Angeles / USC Campus Downtown (81%, 5.4 kilometers, southwest), Burbank Bob Hope Airport (11%, 20 kilometers, northwest), Mount Wilson (0.6%, 26 kilometers, northeast), and Fullerton Municipal Airport (7%, 32 kilometers, southeast).
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.