Average Weather in May in Phelan California, United States
Daily high temperatures increase by 7°F, from 72°F to 79°F, rarely falling below 59°F or exceeding 90°F.
Daily low temperatures increase by 6°F, from 46°F to 53°F, rarely falling below 39°F or exceeding 60°F.
For reference, on July 27, the hottest day of the year, temperatures in Phelan typically range from 63°F to 91°F, while on December 26, the coldest day of the year, they range from 32°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 Phelan experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 25% to 19%.
The clearest day of the month is May 31, with clear, mostly clear, or partly cloudy conditions 81% of the time.
For reference, on February 22, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 46%, while on September 7, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 90%.
Cloud Cover Categories in May
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Phelan, the chance of a wet day over the course of May is gradually decreasing, starting the month at 5% and ending it at 1%.
For reference, the year's highest daily chance of a wet day is 18% on February 20, and its lowest chance is 0% on June 21.
Probability of Precipitation in May
The average sliding 31-day rainfall during May in Phelan is essentially constant, remaining about 0.2 inches throughout, and rarely exceeding 0.9 inches.
Average Monthly Rainfall in May
Over the course of May in Phelan, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 43 minutes, implying an average daily increase of 1 minute, 26 seconds, and weekly increase of 10 minutes, 4 seconds.
The shortest day of the month is May 1, with 13 hours, 35 minutes of daylight and the longest day is May 31, with 14 hours, 18 minutes of daylight.
Hours of Daylight and Twilight in May
The latest sunrise of the month in Phelan is 6:00 AM on May 1 and the earliest sunrise is 21 minutes earlier at 5:39 AM on May 31.
The earliest sunset is 7:34 PM on May 1 and the latest sunset is 22 minutes later at 7:57 PM on May 31.
Daylight saving time is observed in Phelan 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 5:38 AM and sets 14 hours, 28 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, 51 minutes later, at 4:44 PM.
Sunrise & Sunset with Twilight in May
The chance that a given day will be muggy in Phelan is essentially constant during May, remaining around 0% throughout.
For reference, on August 11, the muggiest day of the year, there are muggy conditions 0% 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 Phelan is essentially constant during May, remaining within 0.2 miles per hour of 7.8 miles per hour throughout.
For reference, on April 11, the windiest day of the year, the daily average wind speed is 8.0 miles per hour, while on September 9, the calmest day of the year, the daily average wind speed is 6.1 miles per hour.
Average Wind Speed in May
Wind Direction in May
Phelan 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 Phelan is gradually increasing during May, rising by 2°F, from 61°F to 63°F, over the course of the month.
Average Water Temperature in May
The growing season in Phelan typically lasts for 7.6 months (233 days), from around March 27 to around November 14, rarely starting before February 24 or after April 21, and rarely ending before October 26 or after December 6.
The month of May in Phelan is reliably fully within the growing season.
Time Spent in Various Temperature Bands and the Growing Season in May
The average accumulated growing degree days in Phelan are increasing during May, increasing by 369°F, from 425°F to 795°F, over the course of the month.
Growing Degree Days in May
The average daily incident shortwave solar energy in Phelan is gradually increasing during May, rising by 0.7 kWh, from 7.8 kWh to 8.5 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 Phelan are 34.426 deg latitude, -117.572 deg longitude, and 4,098 ft elevation.
The topography within 2 miles of Phelan contains very significant variations in elevation, with a maximum elevation change of 932 feet and an average elevation above sea level of 4,125 feet. Within 10 miles contains very significant variations in elevation (6,588 feet). Within 50 miles also contains extreme variations in elevation (11,470 feet).
The area within 2 miles of Phelan is covered by shrubs (97%), within 10 miles by shrubs (89%), and within 50 miles by shrubs (72%) and artificial surfaces (14%).
This report illustrates the typical weather in Phelan 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 6 weather stations near enough to contribute to our estimation of the temperature and dew point in Phelan.
For each station, the records are corrected for the elevation difference between that station and Phelan 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 Phelan is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Phelan and a given station.
The stations contributing to this reconstruction are: Southern California Logistics Airport (34%, 25 kilometers, northeast); Ontario International Airport (10%, 41 kilometers, south); San Bernardino International Airport (10%, 48 kilometers, southeast); Mount Wilson (17%, 50 kilometers, southwest); Palmdale United States Air Force Plant 42 Airport (17%, 52 kilometers, northwest); and Edwards Air Force Base (14%, 59 kilometers, northwest).
Time zones for aiports and weather stations are provided by AskGeo.com .