Average Weather in June in Vacaville California, United States
In Vacaville, the month of June is characterized by rising daily high temperatures, with daily highs increasing by 8°F, from 83°F to 90°F over the course of the month, and rarely exceeding 100°F or dropping below 72°F.
Daily low temperatures increase by 4°F, from 56°F to 60°F, rarely falling below 50°F or exceeding 66°F.
For reference, on July 25, the hottest day of the year, temperatures in Vacaville typically range from 60°F to 92°F, while on December 31, the coldest day of the year, they range from 39°F to 54°F.
Average High and Low Temperature in June
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on June. 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 June
The month of June in Vacaville experiences rapidly decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 26% to 13%.
The clearest day of the month is June 30, with clear, mostly clear, or partly cloudy conditions 87% of the time.
For reference, on January 11, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 57%, while on July 20, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 92%.
Cloud Cover in June
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Vacaville, the chance of a wet day over the course of June 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 30% on February 20, and its lowest chance is 0% on July 21.
Probability of Precipitation in June
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 June in Vacaville is gradually decreasing, starting the month at 0.3 inches, when it rarely exceeds 1.2 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 June
Over the course of June in Vacaville, the length of the day is essentially constant. The shortest day of the month is June 1, with 14 hours, 40 minutes of daylight and the longest day is June 21, with 14 hours, 51 minutes of daylight.
Hours of Daylight and Twilight in June
The earliest sunrise of the month in Vacaville is 5:43 AM on June 13 and the latest sunrise is 4 minutes later at 5:47 AM on June 30.
The earliest sunset is 8:26 PM on June 1 and the latest sunset is 10 minutes later at 8:35 PM on June 27.
Daylight saving time is observed in Vacaville during 2017, but it neither starts nor ends during June, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:44 AM and sets 14 hours, 51 minutes later, at 8:35 PM, while on December 21, the shortest day of the year, it rises at 7:21 AM and sets 9 hours, 29 minutes later, at 4:51 PM.
Sunrise & Sunset with Twilight in June
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 Vacaville is essentially constant during June, remaining around 0% throughout.
For reference, on July 4, 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 June
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 Vacaville is essentially constant during June, remaining around 4.5 miles per hour throughout.
For reference, on July 20, the windiest day of the year, the daily average wind speed is 4.7 miles per hour, while on October 29, the calmest day of the year, the daily average wind speed is 3.5 miles per hour.
Average Wind Speed in June
Wind Direction in June
Vacaville 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 Vacaville is essentially constant during June, remaining around 53°F throughout.
Average Water Temperature in June
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 Vacaville is gradually increasing during June, rising by 0.5 kWh, from 8.0 kWh to 8.5 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in June
For the purposes of this report, the geographical coordinates of Vacaville are 38.357 deg latitude, -121.988 deg longitude, and 190 ft elevation.
The topography within 2 miles of Vacaville contains significant variations in elevation, with a maximum elevation change of 541 feet and an average elevation above sea level of 202 feet. Within 10 miles contains significant variations in elevation (2,799 feet). Within 50 miles contains large variations in elevation (4,298 feet).
The area within 2 miles of Vacaville is covered by artificial surfaces (68%) and grassland (22%), within 10 miles by grassland (43%) and cropland (33%), and within 50 miles by cropland (34%) and grassland (25%).
This report illustrates the typical weather in Vacaville 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 Vacaville.
For each station, the records are corrected for the elevation difference between that station and Vacaville 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 Vacaville is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Vacaville and a given station.
The stations contributing to this reconstruction are: Nut Tree Airport (78%, 3.5 kilometers, northeast); Travis Air Force Base (17%, 11 kilometers, southeast); and Napa County Airport (4.1%, 31 kilometers, southwest).
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.