Average Weather in January in Lake Arrowhead California, United States
Daily high temperatures increase by 3°F, from 50°F to 52°F, rarely falling below 40°F or exceeding 62°F.
Daily low temperatures are around 29°F, rarely falling below 21°F or exceeding 37°F.
For reference, on July 27, the hottest day of the year, temperatures in Lake Arrowhead typically range from 57°F to 85°F, while on December 25, the coldest day of the year, they range from 28°F to 49°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 Lake Arrowhead experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 40% throughout the month.
The clearest day of the month is January 21, with clear, mostly clear, or partly cloudy conditions 61% of the time.
For reference, on February 21, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 46%, while on September 7, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 90%.
Cloud Cover Categories in January
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Lake Arrowhead, the chance of a wet day over the course of January is essentially constant, remaining around 13% throughout.
For reference, the year's highest daily chance of a wet day is 18% on February 21, and its lowest chance is 1% on June 15.
Over the course of January in Lake Arrowhead, the chance of a day with only rain remains an essentially constant 9% throughout, the chance of a day with mixed snow and rain remains an essentially constant 3% throughout, and the chance of a day with only snow remains an essentially constant 1% throughout.
Probability of Precipitation in January
The average sliding 31-day rainfall during January in Lake Arrowhead is essentially constant, remaining about 1.4 inches throughout, and rarely exceeding 4.3 inches.
Average Monthly Rainfall in January
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 January in Lake Arrowhead is essentially constant, remaining about 0.2 inches throughout, and rarely exceeding 1.0 inches or falling below -0.0 inches.
The highest average 31-day liquid-equivalent accumulation is 0.3 inches on January 4.
Average Monthly Liquid-Equivalent Snowfall in January
Over the course of January in Lake Arrowhead, 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, 55 minutes of daylight and the longest day is January 31, with 10 hours, 31 minutes of daylight.
Hours of Daylight and Twilight in January
The latest sunrise of the month in Lake Arrowhead is 6:55 AM on January 7 and the earliest sunrise is 9 minutes earlier at 6:46 AM on January 31.
The earliest sunset is 4:50 PM on January 1 and the latest sunset is 28 minutes later at 5:18 PM on January 31.
Daylight saving time is observed in Lake Arrowhead during 2018, 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 5:37 AM and sets 14 hours, 27 minutes later, at 8:03 PM, while on December 21, the shortest day of the year, it rises at 6:50 AM and sets 9 hours, 52 minutes later, at 4:42 PM.
Sunrise & Sunset with Twilight in January
The chance that a given day will be muggy in Lake Arrowhead is essentially constant during January, remaining around 0% throughout.
For reference, on August 22, the muggiest day of the year, there are muggy conditions 0% of the time, while on September 22, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in January
The average hourly wind speed in Lake Arrowhead is essentially constant during January, remaining within 0.1 miles per hour of 7.2 miles per hour throughout.
For reference, on April 26, the windiest day of the year, the daily average wind speed is 7.9 miles per hour, while on September 9, the calmest day of the year, the daily average wind speed is 5.8 miles per hour.
The lowest daily average wind speed during January is 7.1 miles per hour on January 10.
Average Wind Speed in January
Wind Direction in January
Lake Arrowhead 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 Lake Arrowhead is essentially constant during January, remaining around 59°F throughout.
Average Water Temperature in January
The growing season in Lake Arrowhead typically lasts for 6.5 months (199 days), from around April 18 to around November 3, rarely starting before March 22 or after May 11, and rarely ending before October 17 or after November 20.
The month of January in Lake Arrowhead is reliably fully outside of the growing season.
Time Spent in Various Temperature Bands and the Growing Season in January
The average accumulated growing degree days in Lake Arrowhead are essentially constant during January, remaining within 10°F of 10°F throughout.
Growing Degree Days in January
The average daily incident shortwave solar energy in Lake Arrowhead is gradually increasing during January, rising by 0.7 kWh, from 3.1 kWh to 3.8 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 Lake Arrowhead are 34.248 deg latitude, -117.189 deg longitude, and 5,207 ft elevation.
The topography within 2 miles of Lake Arrowhead contains very significant variations in elevation, with a maximum elevation change of 1,896 feet and an average elevation above sea level of 5,314 feet. Within 10 miles contains very significant variations in elevation (7,244 feet). Within 50 miles also contains extreme variations in elevation (11,394 feet).
The area within 2 miles of Lake Arrowhead is covered by trees (66%) and shrubs (33%), within 10 miles by shrubs (68%) and trees (19%), and within 50 miles by shrubs (77%).
This report illustrates the typical weather in Lake Arrowhead 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 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Lake Arrowhead.
For each station, the records are corrected for the elevation difference between that station and Lake Arrowhead 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 Lake Arrowhead is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Lake Arrowhead and a given station.
The stations contributing to this reconstruction are: San Bernardino International Airport (27%, 18 kilometers, south); Southern California Logistics Airport (50%, 41 kilometers, northwest); and Twenty-Nine Palms, Marine Corps Air-Ground Combat Center (24%, 94 kilometers, east).
Time zones for aiports and weather stations are provided by AskGeo.com .