Average Weather in May in Riverdale California, United States
In Riverdale, the month of May is characterized by rising daily high temperatures, with daily highs increasing by 8°F, from 81°F to 89°F over the course of the month, and rarely exceeding 100°F or dropping below 70°F.
Daily low temperatures increase by 6°F, from 52°F to 58°F, rarely falling below 45°F or exceeding 65°F.
For reference, on July 18, the hottest day of the year, temperatures in Riverdale typically range from 65°F to 98°F, while on December 25, the coldest day of the year, they range from 38°F to 55°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 Riverdale experiences decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 31% to 21%.
The clearest day of the month is May 31, with clear, mostly clear, or partly cloudy conditions 79% of the time.
For reference, on February 21, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 48%, while on August 8, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 92%.
Cloud Cover in May
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Riverdale, the chance of a wet day over the course of May is gradually decreasing, starting the month at 7% and ending it at 3%.
For reference, the year's highest daily chance of a wet day is 25% on February 20, and its lowest chance is 0% on August 9.
Probability of Precipitation in May
The average sliding 31-day rainfall during May in Riverdale is gradually decreasing, starting the month at 0.5 inches, when it rarely exceeds 1.3 inches, and ending the month at 0.2 inches, when it rarely exceeds 0.6 inches or falls below -0.0 inches.
Average Monthly Rainfall in May
Over the course of May in Riverdale, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 46 minutes, implying an average daily increase of 1 minute, 33 seconds, and weekly increase of 10 minutes, 50 seconds.
The shortest day of the month is May 1, with 13 hours, 42 minutes of daylight and the longest day is May 31, with 14 hours, 28 minutes of daylight.
Hours of Daylight and Twilight in May
The latest sunrise of the month in Riverdale is 6:05 AM on May 1 and the earliest sunrise is 23 minutes earlier at 5:43 AM on May 31.
The earliest sunset is 7:47 PM on May 1 and the latest sunset is 24 minutes later at 8:11 PM on May 31.
Daylight saving time is observed in Riverdale 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, 39 minutes later, at 8:20 PM, while on December 21, the shortest day of the year, it rises at 7:07 AM and sets 9 hours, 40 minutes later, at 4:47 PM.
Sunrise & Sunset with Twilight in May
The chance that a given day will be muggy in Riverdale is essentially constant during May, remaining around 0% throughout.
For reference, on July 22, 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
The average hourly wind speed in Riverdale is essentially constant during May, remaining within 0.2 miles per hour of 4.3 miles per hour throughout.
For reference, on May 30, the windiest day of the year, the daily average wind speed is 4.6 miles per hour, while on January 13, the calmest day of the year, the daily average wind speed is 2.6 miles per hour.
The highest daily average wind speed during May is 4.6 miles per hour on May 30.
Average Wind Speed in May
Wind Direction in May
The average daily incident shortwave solar energy in Riverdale is gradually increasing during May, rising by 0.9 kWh, from 7.2 kWh to 8.2 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 Riverdale are 36.431 deg latitude, -119.860 deg longitude, and 220 ft elevation.
The topography within 2 miles of Riverdale is essentially flat, with a maximum elevation change of 13 feet and an average elevation above sea level of 220 feet. Within 10 miles is also essentially flat (79 feet). Within 50 miles is essentially flat (5,194 feet).
The area within 2 miles of Riverdale is covered by cropland (98%), within 10 miles by cropland (98%), and within 50 miles by cropland (59%) and grassland (28%).
This report illustrates the typical weather in Riverdale 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 Riverdale.
For each station, the records are corrected for the elevation difference between that station and Riverdale 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 Riverdale is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Riverdale and a given station.
The stations contributing to this reconstruction are: Lemoore Naval Air Station (Reeves Field) (62%, 14 kilometers, southwest); Hanford Municipal Airport (26%, 24 kilometers, southeast); and Fresno Air Terminal Airport (12%, 41 kilometers, north).
Time zones for aiports and weather stations are provided by AskGeo.com .