Average Weather in May in Mission Viejo California, United States
Daily high temperatures increase by 2°F, from 71°F to 74°F, rarely falling below 64°F or exceeding 83°F.
Daily low temperatures increase by 3°F, from 54°F to 57°F, rarely falling below 49°F or exceeding 62°F.
For reference, on August 23, the hottest day of the year, temperatures in Mission Viejo typically range from 64°F to 82°F, while on December 18, the coldest day of the year, they range from 47°F to 66°F.
Average High and Low Temperature in May
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on May. 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 May
Tacna, Peru (4,745 miles away); Rabat, Morocco (5,972 miles); and Port Elizabeth, South Africa (10,348 miles) are the far-away foreign places with temperatures most similar to Mission Viejo (view comparison).
The month of May in Mission Viejo experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 25% to 20%.
The clearest day of the month is May 31, with clear, mostly clear, or partly cloudy conditions 80% of the time.
For reference, on February 20, 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 May
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Mission Viejo, the chance of a wet day over the course of May is decreasing, starting the month at 5% and ending it at 1%.
For reference, the year's highest daily chance of a wet day is 20% on February 20, and its lowest chance is 0% on June 25.
Probability of Precipitation in May
The average sliding 31-day rainfall during May in Mission Viejo is gradually decreasing, starting the month at 0.4 inches, when it rarely exceeds 1.0 inches or falls below -0.0 inches, and ending the month at 0.1 inches, when it rarely exceeds 0.4 inches or falls below -0.0 inches.
Average Monthly Rainfall in May
Over the course of May in Mission Viejo, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 42 minutes, implying an average daily increase of 1 minute, 24 seconds, and weekly increase of 9 minutes, 45 seconds.
The shortest day of the month is May 1, with 13 hours, 32 minutes of daylight and the longest day is May 31, with 14 hours, 14 minutes of daylight.
Hours of Daylight and Twilight in May
The latest sunrise of the month in Mission Viejo is 6:02 AM on May 1 and the earliest sunrise is 20 minutes earlier at 5:41 AM on May 31.
The earliest sunset is 7:33 PM on May 1 and the latest sunset is 21 minutes later at 7:55 PM on May 31.
Daylight saving time is observed in Mission Viejo during 2018, but it neither starts nor ends during May, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:40 AM and sets 14 hours, 23 minutes later, at 8:04 PM, while on December 21, the shortest day of the year, it rises at 6:51 AM and sets 9 hours, 55 minutes later, at 4:46 PM.
Sunrise & Sunset with Twilight in May
The chance that a given day will be muggy in Mission Viejo is essentially constant during May, remaining around 0% throughout.
For reference, on August 2, the muggiest day of the year, there are muggy conditions 9% of the time, while on February 1, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in May
The average hourly wind speed in Mission Viejo is essentially constant during May, remaining within 0.2 miles per hour of 6.6 miles per hour throughout.
For reference, on December 30, the windiest day of the year, the daily average wind speed is 7.2 miles per hour, while on September 8, the calmest day of the year, the daily average wind speed is 5.3 miles per hour.
Average Wind Speed in May
Wind Direction in May
Mission Viejo 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 Mission Viejo is gradually increasing during May, rising by 2°F, from 62°F to 64°F, over the course of the month.
Average Water Temperature in May
Temperatures in Mission Viejo 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 May
The average accumulated growing degree days in Mission Viejo are increasing during May, increasing by 394°F, from 1,004°F to 1,398°F, over the course of the month.
Growing Degree Days in May
The average daily incident shortwave solar energy in Mission Viejo is gradually increasing during May, rising by 0.6 kWh, from 7.5 kWh to 8.1 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in May
For the purposes of this report, the geographical coordinates of Mission Viejo are 33.600 deg latitude, -117.672 deg longitude, and 469 ft elevation.
The topography within 2 miles of Mission Viejo contains significant variations in elevation, with a maximum elevation change of 564 feet and an average elevation above sea level of 485 feet. Within 10 miles contains significant variations in elevation (4,505 feet). Within 50 miles also contains extreme variations in elevation (10,033 feet).
The area within 2 miles of Mission Viejo is covered by artificial surfaces (100%), within 10 miles by artificial surfaces (41%) and shrubs (37%), and within 50 miles by water (36%) and shrubs (31%).
This report illustrates the typical weather in Mission Viejo 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 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Mission Viejo.
For each station, the records are corrected for the elevation difference between that station and Mission Viejo 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 Mission Viejo is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Mission Viejo and a given station.
The stations contributing to this reconstruction are: El Toro Mcas (90%, 9 kilometers, northwest) and Oceanside Harbor (10%, 40 kilometers, southeast).
Time zones for aiports and weather stations are provided by AskGeo.com .