Average Weather in May in Merced California, United States
In Merced, the month of May is characterized by rising daily high temperatures, with daily highs increasing by 8°F, from 78°F to 86°F over the course of the month, and rarely exceeding 97°F or dropping below 67°F.
Daily low temperatures increase by 5°F, from 52°F to 57°F, rarely falling below 45°F or exceeding 64°F.
For reference, on July 18, the hottest day of the year, temperatures in Merced typically range from 64°F to 96°F, while on December 30, the coldest day of the year, they range from 38°F to 53°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
The month of May in Merced experiences decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 33% to 23%.
The clearest day of the month is May 31, with clear, mostly clear, or partly cloudy conditions 77% of the time.
For reference, on February 8, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 51%, while on August 8, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 92%.
Cloud Cover Categories in May
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Merced, the chance of a wet day over the course of May is decreasing, starting the month at 9% and ending it at 5%.
For reference, the year's highest daily chance of a wet day is 28% on February 21, and its lowest chance is 0% on August 2.
Probability of Precipitation in May
To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day rainfall during May in Merced is gradually decreasing, starting the month at 0.7 inches, when it rarely exceeds 1.9 inches, and ending the month at 0.3 inches, when it rarely exceeds 1.2 inches.
Average Monthly Rainfall in May
Over the course of May in Merced, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 48 minutes, implying an average daily increase of 1 minute, 36 seconds, and weekly increase of 11 minutes, 12 seconds.
The shortest day of the month is May 1, with 13 hours, 45 minutes of daylight and the longest day is May 31, with 14 hours, 33 minutes of daylight.
Hours of Daylight and Twilight in May
The latest sunrise of the month in Merced is 6:06 AM on May 1 and the earliest sunrise is 23 minutes earlier at 5:43 AM on May 31.
The earliest sunset is 7:51 PM on May 1 and the latest sunset is 25 minutes later at 8:16 PM on May 31.
Daylight saving time is observed in Merced during 2017, 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 5:41 AM and sets 14 hours, 44 minutes later, at 8:25 PM, while on December 21, the shortest day of the year, it rises at 7:12 AM and sets 9 hours, 35 minutes later, at 4:48 PM.
Sunrise & Sunset with Twilight in May
We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.
The chance that a given day will be muggy in Merced is essentially constant during May, remaining around 0% throughout.
For reference, on July 20, the muggiest day of the year, there are muggy conditions 1% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in May
This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.
The average hourly wind speed in Merced is gradually increasing during May, increasing from 3.9 miles per hour to 4.5 miles per hour over the course of the month.
For reference, on June 6, the windiest day of the year, the daily average wind speed is 4.5 miles per hour, while on November 2, the calmest day of the year, the daily average wind speed is 2.8 miles per hour.
Average Wind Speed in May
Wind Direction in May
This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.
The average daily incident shortwave solar energy in Merced is gradually increasing during May, rising by 1.0 kWh, from 7.1 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 Merced are 37.302 deg latitude, -120.483 deg longitude, and 167 ft elevation.
The topography within 2 miles of Merced is essentially flat, with a maximum elevation change of 46 feet and an average elevation above sea level of 167 feet. Within 10 miles is essentially flat (466 feet). Within 50 miles contains only modest variations in elevation (6,939 feet).
The area within 2 miles of Merced is covered by artificial surfaces (84%) and cropland (16%), within 10 miles by cropland (66%) and grassland (24%), and within 50 miles by cropland (42%) and grassland (36%).
This report illustrates the typical weather in Merced 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 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Merced.
For each station, the records are corrected for the elevation difference between that station and Merced 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 Merced is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Merced and a given station.
The stations contributing to this reconstruction are: Merced Municipal Airport (86%, 3.3 kilometers, southwest); Castle Airport (13%, 12 kilometers, northwest); and Madera Municipal Airport (1.5%, 48 kilometers, southeast).
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , by Jean Meeus.
All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.
Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.
Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.
Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .
Time zones for aiports and weather stations are provided by AskGeo.com .
Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.