Average Weather in April in Norfolk Virginia, United States
In Norfolk, the month of April is characterized by rising daily high temperatures, with daily highs increasing by 9°F, from 64°F to 73°F over the course of the month, and rarely exceeding 86°F or dropping below 51°F.
Daily low temperatures increase by 8°F, from 47°F to 55°F, rarely falling below 37°F or exceeding 65°F.
For reference, on July 21, the hottest day of the year, temperatures in Norfolk typically range from 74°F to 88°F, while on January 29, the coldest day of the year, they range from 34°F to 49°F.
Average High and Low Temperature in April
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on April. 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 April
The month of April in Norfolk experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 45% throughout the month.
The clearest day of the month is April 30, with clear, mostly clear, or partly cloudy conditions 56% of the time.
For reference, on December 26, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 50%, while on October 12, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 65%.
Cloud Cover Categories in April
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Norfolk, the chance of a wet day over the course of April is essentially constant, remaining around 30% throughout.
For reference, the year's highest daily chance of a wet day is 45% on August 5, and its lowest chance is 21% on November 13.
Probability of Precipitation in April
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 April in Norfolk is essentially constant, remaining about 3.2 inches throughout, and rarely exceeding 5.6 inches or falling below 1.3 inches.
Average Monthly Rainfall in April
Over the course of April in Norfolk, the length of the day is rapidly increasing. From the start to the end of the month, the length of the day increases by 1 hour, 4 minutes, implying an average daily increase of 2 minutes, 13 seconds, and weekly increase of 15 minutes, 29 seconds.
The shortest day of the month is April 1, with 12 hours, 37 minutes of daylight and the longest day is April 30, with 13 hours, 41 minutes of daylight.
Hours of Daylight and Twilight in April
The latest sunrise of the month in Norfolk is 6:50 AM on April 1 and the earliest sunrise is 39 minutes earlier at 6:11 AM on April 30.
The earliest sunset is 7:27 PM on April 1 and the latest sunset is 25 minutes later at 7:53 PM on April 30.
Daylight saving time is observed in Norfolk during 2017, but it neither starts nor ends during April, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:46 AM and sets 14 hours, 41 minutes later, at 8:27 PM, while on December 21, the shortest day of the year, it rises at 7:14 AM and sets 9 hours, 38 minutes later, at 4:52 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in April
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 Norfolk is increasing during April, rising from 1% to 6% over the course of the month.
For reference, on July 28, the muggiest day of the year, there are muggy conditions 85% of the time, while on February 10, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in April
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 Norfolk is essentially constant during April, remaining within 0.2 miles per hour of 6.1 miles per hour throughout.
For reference, on February 27, the windiest day of the year, the daily average wind speed is 6.5 miles per hour, while on August 9, the calmest day of the year, the daily average wind speed is 4.4 miles per hour.
Average Wind Speed in April
Wind Direction in April
Norfolk 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 Norfolk is rapidly increasing during April, rising by 8°F, from 50°F to 58°F, over the course of the month.
Average Water Temperature in April
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 Norfolk is increasing during April, rising by 1.0 kWh, from 5.2 kWh to 6.2 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in April
For the purposes of this report, the geographical coordinates of Norfolk are 36.847 deg latitude, -76.285 deg longitude, and 7 ft elevation.
The topography within 2 miles of Norfolk is essentially flat, with a maximum elevation change of 13 feet and an average elevation above sea level of 5 feet. Within 10 miles is essentially flat (102 feet). Within 50 miles also contains only modest variations in elevation (197 feet).
The area within 2 miles of Norfolk is covered by artificial surfaces (88%) and water (12%), within 10 miles by artificial surfaces (65%) and water (22%), and within 50 miles by water (42%) and trees (24%).
This report illustrates the typical weather in Norfolk 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 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Norfolk.
For each station, the records are corrected for the elevation difference between that station and Norfolk 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 Norfolk is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Norfolk and a given station.
The stations contributing to this reconstruction are: Naval Station Norfolk Chambers Field (38%, 10 kilometers, north); Norfolk International Airport (36%, 10 kilometers, northeast); Chesapeake Municipal Airport (13%, 20 kilometers, south); and Fentress, Naval Auxiliary Landing Field (12%, 22 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.