Average Weather in March in Diamond Bar California, United States
Daily high temperatures increase by 3°F, from 69°F to 72°F, rarely falling below 58°F or exceeding 84°F.
Daily low temperatures increase by 2°F, from 47°F to 49°F, rarely falling below 40°F or exceeding 55°F.
For reference, on August 22, the hottest day of the year, temperatures in Diamond Bar typically range from 64°F to 91°F, while on December 25, the coldest day of the year, they range from 43°F to 66°F.
Average High and Low Temperature in March
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on March. 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 March
The month of March in Diamond Bar experiences decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 42% to 32%.
The clearest day of the month is March 31, with clear, mostly clear, or partly cloudy conditions 68% of the time.
For reference, on February 20, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 44%, while on September 7, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 91%.
Cloud Cover Categories in March
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Diamond Bar, the chance of a wet day over the course of March is rapidly decreasing, starting the month at 18% and ending it at 10%.
For reference, the year's highest daily chance of a wet day is 20% on February 19, and its lowest chance is 0% on June 23.
Probability of Precipitation in March
The average sliding 31-day rainfall during March in Diamond Bar is rapidly decreasing, starting the month at 2.8 inches, when it rarely exceeds 6.3 inches or falls below 0.2 inches, and ending the month at 1.1 inches, when it rarely exceeds 3.0 inches.
Average Monthly Rainfall in March
Over the course of March in Diamond Bar, the length of the day is rapidly increasing. From the start to the end of the month, the length of the day increases by 1 hour, 4 minutes, implying an average daily increase of 2 minutes, 7 seconds, and weekly increase of 14 minutes, 52 seconds.
The shortest day of the month is March 1, with 11 hours, 28 minutes of daylight and the longest day is March 31, with 12 hours, 32 minutes of daylight.
Hours of Daylight and Twilight in March
The earliest sunrise of the month in Diamond Bar is 6:08 AM on March 10 and the latest sunrise is 59 minutes later at 7:06 AM on March 11.
The earliest sunset is 5:47 PM on March 1 and the latest sunset is 1 hour, 24 minutes later at 7:11 PM on March 31.
Daylight saving time (DST) starts at 3:00 AM on March 11, 2018, shifting sunrise and sunset to be an hour later.
For reference, on June 21, the longest day of the year, the Sun rises at 5:40 AM and sets 14 hours, 25 minutes later, at 8:05 PM, while on December 21, the shortest day of the year, it rises at 6:52 AM and sets 9 hours, 53 minutes later, at 4:46 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in March
The chance that a given day will be muggy in Diamond Bar is essentially constant during March, remaining around 0% throughout.
For reference, on August 6, the muggiest day of the year, there are muggy conditions 6% of the time, while on November 8, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in March
The average hourly wind speed in Diamond Bar is essentially constant during March, remaining within 0.1 miles per hour of 6.8 miles per hour throughout.
For reference, on December 31, the windiest day of the year, the daily average wind speed is 7.9 miles per hour, while on September 5, the calmest day of the year, the daily average wind speed is 5.2 miles per hour.
Average Wind Speed in March
Wind Direction in March
Diamond Bar 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 Diamond Bar is essentially constant during March, remaining around 59°F throughout.
Average Water Temperature in March
Temperatures in Diamond Bar are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.
Time Spent in Various Temperature Bands and the Growing Season in March
The average accumulated growing degree days in Diamond Bar are increasing during March, increasing by 251°F, from 380°F to 631°F, over the course of the month.
Growing Degree Days in March
The average daily incident shortwave solar energy in Diamond Bar is rapidly increasing during March, rising by 1.6 kWh, from 4.8 kWh to 6.4 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in March
For the purposes of this report, the geographical coordinates of Diamond Bar are 34.029 deg latitude, -117.810 deg longitude, and 823 ft elevation.
The topography within 2 miles of Diamond Bar contains very significant variations in elevation, with a maximum elevation change of 883 feet and an average elevation above sea level of 838 feet. Within 10 miles contains very significant variations in elevation (3,005 feet). Within 50 miles contains large variations in elevation (10,062 feet).
The area within 2 miles of Diamond Bar is covered by artificial surfaces (75%) and shrubs (23%), within 10 miles by artificial surfaces (66%) and shrubs (23%), and within 50 miles by shrubs (48%) and artificial surfaces (24%).
This report illustrates the typical weather in Diamond Bar 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 Diamond Bar.
For each station, the records are corrected for the elevation difference between that station and Diamond Bar 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 Diamond Bar is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Diamond Bar and a given station.
The stations contributing to this reconstruction are: Ontario International Airport (44%, 15 kilometers, east); Chino Airport (38%, 17 kilometers, east); Fullerton Municipal Airport (16%, 23 kilometers, southwest); and Mount Wilson (1.5%, 33 kilometers, northwest).
Time zones for aiports and weather stations are provided by AskGeo.com .