Average Weather in May in Jamul California, United States
Daily low temperatures increase by 4°F, from 51°F to 55°F, rarely falling below 47°F or exceeding 59°F.
For reference, on August 24, the hottest day of the year, temperatures in Jamul typically range from 63°F to 85°F, while on December 27, the coldest day of the year, they range from 41°F to 65°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
Canguçu, Brazil (6,102 miles away); Oudtshoorn, South Africa (10,096 miles); and Waroona, Australia (9,414 miles) are the far-away foreign places with temperatures most similar to Jamul (view comparison).
The month of May in Jamul experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 28% 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 22, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 45%, while on September 10, 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 Jamul, the chance of a wet day over the course of May is decreasing, starting the month at 6% and ending it at 1%.
For reference, the year's highest daily chance of a wet day is 20% on February 22, and its lowest chance is 1% on June 27.
Probability of Precipitation in May
The average sliding 31-day rainfall during May in Jamul is gradually decreasing, starting the month at 0.4 inches, when it rarely exceeds 1.1 inches or falls below -0.0 inches, and ending the month at 0.1 inches, when it rarely exceeds 0.3 inches or falls below -0.0 inches.
Average Monthly Rainfall in May
Over the course of May in Jamul, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 40 minutes, implying an average daily increase of 1 minute, 20 seconds, and weekly increase of 9 minutes, 23 seconds.
The shortest day of the month is May 1, with 13 hours, 29 minutes of daylight and the longest day is May 31, with 14 hours, 10 minutes of daylight.
Hours of Daylight and Twilight in May
The latest sunrise of the month in Jamul is 6:00 AM on May 1 and the earliest sunrise is 19 minutes earlier at 5:40 AM on May 31.
The earliest sunset is 7:29 PM on May 1 and the latest sunset is 21 minutes later at 7:50 PM on May 31.
Daylight saving time is observed in Jamul 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 5:40 AM and sets 14 hours, 18 minutes later, at 7:58 PM, while on December 21, the shortest day of the year, it rises at 6:45 AM and sets 9 hours, 60 minutes later, at 4:45 PM.
Sunrise & Sunset with Twilight in May
The chance that a given day will be muggy in Jamul is essentially constant during May, remaining around 0% throughout.
For reference, on August 28, the muggiest day of the year, there are muggy conditions 4% of the time, while on December 4, 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 Jamul is essentially constant during May, remaining within 0.2 miles per hour of 7.6 miles per hour throughout.
For reference, on December 30, the windiest day of the year, the daily average wind speed is 8.4 miles per hour, while on September 8, the calmest day of the year, the daily average wind speed is 5.8 miles per hour.
Average Wind Speed in May
Wind Direction in May
Jamul 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 Jamul is essentially constant during May, remaining within 1°F of 63°F throughout.
Average Water Temperature in May
While it does not do so every year, freezing temperatures are seen in Jamul over some winters. The day least likely to be in the growing season is January 7, with a 70% chance.
Time Spent in Various Temperature Bands and the Growing Season in May
The average accumulated growing degree days in Jamul are increasing during May, increasing by 355°F, from 790°F to 1,145°F, over the course of the month.
Growing Degree Days in May
The average daily incident shortwave solar energy in Jamul is gradually increasing during May, rising by 0.6 kWh, from 7.6 kWh to 8.3 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 Jamul are 32.717 deg latitude, -116.876 deg longitude, and 1,030 ft elevation.
The topography within 2 miles of Jamul contains very significant variations in elevation, with a maximum elevation change of 1,096 feet and an average elevation above sea level of 1,006 feet. Within 10 miles contains very significant variations in elevation (3,711 feet). Within 50 miles also contains extreme variations in elevation (6,516 feet).
The area within 2 miles of Jamul is covered by shrubs (69%) and grassland (31%), within 10 miles by shrubs (61%) and artificial surfaces (25%), and within 50 miles by shrubs (48%) and water (29%).
This report illustrates the typical weather in Jamul 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 Jamul.
For each station, the records are corrected for the elevation difference between that station and Jamul 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 Jamul is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Jamul and a given station.
The stations contributing to this reconstruction are: Gillespie Field (44%, 15 kilometers, northwest); Brown Field Municipal Airport (45%, 19 kilometers, southwest); and Campo (11%, 40 kilometers, east).
Time zones for aiports and weather stations are provided by AskGeo.com .