Average Weather in April in South Whittier California, United States
Daily high temperatures increase by 3°F, from 72°F to 75°F, rarely falling below 63°F or exceeding 87°F.
Daily low temperatures increase by 4°F, from 53°F to 57°F, rarely falling below 47°F or exceeding 61°F.
For reference, on August 23, the hottest day of the year, temperatures in South Whittier typically range from 67°F to 87°F, while on December 25, the coldest day of the year, they range from 46°F to 67°F.
Average High and Low Temperature in April
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on April. 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 April
The month of April in South Whittier experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 30% to 24%.
The clearest day of the month is April 30, with clear, mostly clear, or partly cloudy conditions 76% 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 Categories in April
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In South Whittier, the chance of a wet day over the course of April is decreasing, starting the month at 10% and ending it at 5%.
For reference, the year's highest daily chance of a wet day is 20% on February 19, and its lowest chance is 0% on July 17.
Probability of Precipitation in April
The average sliding 31-day rainfall during April in South Whittier is decreasing, starting the month at 1.1 inches, when it rarely exceeds 3.1 inches, and ending the month at 0.4 inches, when it rarely exceeds 1.2 inches.
Average Monthly Rainfall in April
Over the course of April in South Whittier, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 58 minutes, implying an average daily increase of 1 minute, 59 seconds, and weekly increase of 13 minutes, 54 seconds.
The shortest day of the month is April 1, with 12 hours, 34 minutes of daylight and the longest day is April 30, with 13 hours, 31 minutes of daylight.
Hours of Daylight and Twilight in April
The latest sunrise of the month in South Whittier is 6:39 AM on April 1 and the earliest sunrise is 35 minutes earlier at 6:03 AM on April 30.
The earliest sunset is 7:13 PM on April 1 and the latest sunset is 22 minutes later at 7:35 PM on April 30.
Daylight saving time is observed in South Whittier during 2018, but it neither starts nor ends during April, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:41 AM and sets 14 hours, 25 minutes later, at 8:06 PM, while on December 21, the shortest day of the year, it rises at 6:53 AM and sets 9 hours, 54 minutes later, at 4:47 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in April
The chance that a given day will be muggy in South Whittier is essentially constant during April, remaining around 0% throughout.
For reference, on August 28, 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 April
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in South Whittier is essentially constant during April, remaining within 0.2 miles per hour of 6.9 miles per hour throughout.
For reference, on December 31, the windiest day of the year, the daily average wind speed is 8.2 miles per hour, while on August 13, the calmest day of the year, the daily average wind speed is 5.2 miles per hour.
Average Wind Speed in April
Wind Direction in April
South Whittier 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 South Whittier is essentially constant during April, remaining within 1°F of 60°F throughout.
Average Water Temperature in April
Temperatures in South Whittier 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 April
The average accumulated growing degree days in South Whittier are increasing during April, increasing by 371°F, from 761°F to 1,132°F, over the course of the month.
Growing Degree Days in April
The average daily incident shortwave solar energy in South Whittier is increasing during April, rising by 1.1 kWh, from 6.5 kWh to 7.6 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in April
For the purposes of this report, the geographical coordinates of South Whittier are 33.950 deg latitude, -118.039 deg longitude, and 167 ft elevation.
The topography within 2 miles of South Whittier contains only modest variations in elevation, with a maximum elevation change of 433 feet and an average elevation above sea level of 193 feet. Within 10 miles contains only modest variations in elevation (1,404 feet). Within 50 miles contains very significant variations in elevation (10,033 feet).
The area within 2 miles of South Whittier is covered by artificial surfaces (100%), within 10 miles by artificial surfaces (94%), and within 50 miles by shrubs (39%) and water (29%).
This report illustrates the typical weather in South Whittier 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 5 weather stations near enough to contribute to our estimation of the temperature and dew point in South Whittier.
For each station, the records are corrected for the elevation difference between that station and South Whittier 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 South Whittier is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between South Whittier and a given station.
The stations contributing to this reconstruction are: Fullerton Municipal Airport (55%, 10 kilometers, southeast); Long Beach Airport (23%, 18 kilometers, southwest); Los Angeles / USC Campus Downtown (15%, 25 kilometers, west); Mount Wilson (0.8%, 32 kilometers, north); and Ontario International Airport (6%, 38 kilometers, east).
Time zones for aiports and weather stations are provided by AskGeo.com .