Average Weather in Lake Arrowhead California, United States
In Lake Arrowhead, the summers are warm, arid, and mostly clear and the winters are very cold and partly cloudy. Over the course of the year, the temperature typically varies from 28°F to 85°F and is rarely below 20°F or above 92°F.
Based on the tourism score, the best time of year to visit Lake Arrowhead for warm-weather activities is from late June to early September.
The hot season lasts for 3.3 months, from June 12 to September 21, with an average daily high temperature above 78°F. The hottest day of the year is July 27, with an average high of 85°F and low of 57°F.
The cold season lasts for 3.5 months, from November 21 to March 5, with an average daily high temperature below 57°F. The coldest day of the year is December 25, with an average low of 28°F and high of 49°F.
Average High and Low Temperature
The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, 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 Lake Arrowhead, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.
The clearer part of the year in Lake Arrowhead begins around April 24 and lasts for 6.4 months, ending around November 5. On September 7, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 90% of the time, and overcast or mostly cloudy 10% of the time.
The cloudier part of the year begins around November 5 and lasts for 5.6 months, ending around April 24. On February 21, the cloudiest day of the year, the sky is overcast or mostly cloudy 46% of the time, and clear, mostly clear, or partly cloudy 54% of the time.
Cloud Cover Categories
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Lake Arrowhead varies throughout the year.
The wetter season lasts 4.0 months, from November 29 to March 31, with a greater than 9% chance of a given day being a wet day. The chance of a wet day peaks at 18% on February 20.
The drier season lasts 8.0 months, from March 31 to November 29. The smallest chance of a wet day is 1% on June 15.
Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 15% on February 20.
Daily Chance of Precipitation
To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Lake Arrowhead experiences some seasonal variation in monthly rainfall.
The rainy period of the year lasts for 5.1 months, from November 6 to April 9, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around February 19, with an average total accumulation of 1.8 inches.
The rainless period of the year lasts for 6.9 months, from April 9 to November 6. The least rain falls around June 17, with an average total accumulation of 0.1 inches.
Average Monthly Rainfall
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. Colder, drier snow tends to be on the higher end of that range and warmer, wetter snow on the lower end.
As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Lake Arrowhead experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 2.6 months, from December 2 to February 20, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around January 4, with an average total liquid-equivalent accumulation of 0.3 inches.
The snowless period of the year lasts for 9.4 months, from February 20 to December 2. The least snow falls around July 29, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in Lake Arrowhead varies significantly over the course of the year. In 2018, the shortest day is December 21, with 9 hours, 52 minutes of daylight; the longest day is June 21, with 14 hours, 27 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:36 AM on June 12, and the latest sunrise is 1 hour, 34 minutes later at 7:10 AM on November 3. The earliest sunset is at 4:38 PM on December 5, and the latest sunset is 3 hours, 26 minutes later at 8:04 PM on June 29.
Daylight saving time (DST) is observed in Lake Arrowhead during 2018, starting in the spring on March 11, lasting 7.8 months, and ending in the fall on November 4.
Sunrise & Sunset with Twilight and Daylight Saving Time
The perceived humidity level in Lake Arrowhead, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, remaining a virtually constant 0% throughout.
Humidity Comfort Levels
The average hourly wind speed in Lake Arrowhead experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 7.7 months, from November 22 to July 12, with average wind speeds of more than 6.8 miles per hour. The windiest day of the year is April 26, with an average hourly wind speed of 7.9 miles per hour.
The calmer time of year lasts for 4.3 months, from July 12 to November 22. The calmest day of the year is September 9, with an average hourly wind speed of 5.8 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Lake Arrowhead varies throughout the year.
The wind is most often from the west for 9.1 months, from February 9 to November 13, with a peak percentage of 74% on June 4. The wind is most often from the north for 2.9 months, from November 13 to February 9, with a peak percentage of 39% on January 1.
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 water temperature experiences some seasonal variation over the course of the year.
The time of year with warmer water lasts for 3.2 months, from July 5 to October 11, with an average temperature above 67°F. The day of the year with the warmest water is August 24, with an average temperature of 69°F.
The time of year with cooler water lasts for 4.5 months, from December 9 to April 25, with an average temperature below 61°F. The day of the year with the coolest water is February 6, with an average temperature of 59°F.
Average Water Temperature
Best Time of Year to Visit
To characterize how pleasant the weather is in Lake Arrowhead throughout the year, we compute two travel scores.
The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Lake Arrowhead for general outdoor tourist activities is from late June to early September, with a peak score in the last week of July.
The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Lake Arrowhead for hot-weather activities is from early July to late August, with a peak score in the last week of July.
For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.
Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.
Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.
Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.
Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.
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.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Lake Arrowhead should appear around March 17, only rarely appearing before February 26 or after April 9.
Growing Degree Days
The average daily incident shortwave solar energy experiences extreme seasonal variation over the course of the year.
The brighter period of the year lasts for 3.6 months, from April 24 to August 12, with an average daily incident shortwave energy per square meter above 7.6 kWh. The brightest day of the year is June 18, with an average of 8.7 kWh.
The darker period of the year lasts for 3.2 months, from November 6 to February 11, with an average daily incident shortwave energy per square meter below 4.2 kWh. The darkest day of the year is December 22, with an average of 3.0 kWh.
Average Daily Incident Shortwave Solar Energy
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, 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 .