Average Weather in Oak Hills California, United States
In Oak Hills, the summers are hot, arid, and mostly clear and the winters are cold and partly cloudy. Over the course of the year, the temperature typically varies from 32°F to 92°F and is rarely below 24°F or above 98°F.
Based on the tourism score, the best time of year to visit Oak Hills for warm-weather activities is from mid June to late September.
The hot season lasts for 3.3 months, from June 11 to September 20, with an average daily high temperature above 84°F. The hottest day of the year is July 27, with an average high of 92°F and low of 62°F.
The cool season lasts for 3.5 months, from November 20 to March 5, with an average daily high temperature below 62°F. The coldest day of the year is December 25, with an average low of 32°F and high of 54°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 Oak Hills, 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 Oak Hills begins around April 23 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 23. On February 20, 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 Oak Hills varies throughout the year.
The wetter season lasts 4.3 months, from November 23 to April 2, 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 7.7 months, from April 2 to November 23. The smallest chance of a wet day is 1% on June 21.
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 17% 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. Oak Hills experiences significant seasonal variation in monthly rainfall.
The rainy period of the year lasts for 5.5 months, from October 31 to April 15, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around February 18, with an average total accumulation of 2.2 inches.
The rainless period of the year lasts for 6.5 months, from April 15 to October 31. The least rain falls around June 19, with an average total accumulation of 0.1 inches.
Average Monthly Rainfall
The length of the day in Oak Hills varies significantly over the course of the year. In 2018, the shortest day is December 21, with 9 hours, 51 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, 35 minutes later at 7:11 AM on November 3. The earliest sunset is at 4:39 PM on December 5, and the latest sunset is 3 hours, 27 minutes later at 8:05 PM on June 29.
Daylight saving time (DST) is observed in Oak Hills 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 Oak Hills, 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 Oak Hills experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 7.9 months, from November 22 to July 18, with average wind speeds of more than 7.1 miles per hour. The windiest day of the year is April 25, with an average hourly wind speed of 8.1 miles per hour.
The calmer time of year lasts for 4.1 months, from July 18 to November 22. The calmest day of the year is September 9, with an average hourly wind speed of 6.1 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Oak Hills varies throughout the year.
The wind is most often from the west for 9.2 months, from February 9 to November 14, with a peak percentage of 69% on June 2. The wind is most often from the north for 2.8 months, from November 14 to February 9, with a peak percentage of 35% on January 1.
Oak Hills 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 Oak Hills 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 Oak Hills for general outdoor tourist activities is from mid June to late September, with a peak score in the second week of August.
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 Oak Hills 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 Oak Hills typically lasts for 7.9 months (241 days), from around March 20 to around November 17, rarely starting before February 17 or after April 16, and rarely ending before October 28 or after December 7.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Oak Hills should appear around February 19, only rarely appearing before February 4 or after March 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 3.7 months, from April 25 to August 14, with an average daily incident shortwave energy per square meter above 7.6 kWh. The brightest day of the year is June 17, with an average of 8.8 kWh.
The darker period of the year lasts for 3.2 months, from November 6 to February 12, 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 Oak Hills are 34.383 deg latitude, -117.381 deg longitude, and 3,675 ft elevation.
The topography within 2 miles of Oak Hills contains only modest variations in elevation, with a maximum elevation change of 459 feet and an average elevation above sea level of 3,718 feet. Within 10 miles contains only modest variations in elevation (3,205 feet). Within 50 miles contains large variations in elevation (11,417 feet).
The area within 2 miles of Oak Hills is covered by shrubs (97%), within 10 miles by shrubs (86%), and within 50 miles by shrubs (75%) and artificial surfaces (10%).
This report illustrates the typical weather in Oak Hills, 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 Oak Hills.
For each station, the records are corrected for the elevation difference between that station and Oak Hills 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 Oak Hills is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Oak Hills and a given station.
The stations contributing to this reconstruction are: Southern California Logistics Airport (69%, 22 kilometers, north); San Bernardino International Airport (17%, 35 kilometers, southeast); and Ontario International Airport (15%, 43 kilometers, southwest).
Time zones for aiports and weather stations are provided by AskGeo.com .