Average Weather in April in Green Bay Wisconsin, United States
In Green Bay, the month of April is characterized by rapidly rising daily high temperatures, with daily highs increasing by 13°F, from 47°F to 61°F over the course of the month, and rarely exceeding 75°F or dropping below 35°F.
Daily low temperatures increase by 10°F, from 32°F to 42°F, rarely falling below 21°F or exceeding 52°F.
For reference, on July 19, the hottest day of the year, temperatures in Green Bay typically range from 62°F to 81°F, while on January 29, the coldest day of the year, they range from 12°F to 26°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 Green Bay experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 55% throughout the month.
The clearest day of the month is April 25, with clear, mostly clear, or partly cloudy conditions 46% of the time.
For reference, on January 26, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 61%, while on August 7, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 67%.
Cloud Cover Categories in April
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Green Bay, the chance of a wet day over the course of April is increasing, starting the month at 24% and ending it at 29%.
For reference, the year's highest daily chance of a wet day is 38% on June 9, and its lowest chance is 12% on February 2.
Over the course of April in Green Bay, the chance of a day with only rain increases from 19% to 28%, the chance of a day with mixed snow and rain decreases from 4% to 1%, and the chance of a day with only snow remains an essentially constant 1% throughout.
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 Green Bay is increasing, starting the month at 1.9 inches, when it rarely exceeds 3.3 inches or falls below 0.7 inches, and ending the month at 2.6 inches, when it rarely exceeds 4.2 inches or falls below 1.2 inches.
Average Monthly Rainfall in April
We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. As with rainfall, we consider the liquid-equivalent snowfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day liquid-equivalent snowfall during April in Green Bay is essentially constant, remaining about 0.1 inches throughout, and rarely exceeding 0.6 inches or falling below -0.0 inches.
Average Monthly Liquid-Equivalent Snowfall in April
Over the course of April in Green Bay, 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, 25 minutes, implying an average daily increase of 2 minutes, 55 seconds, and weekly increase of 20 minutes, 28 seconds.
The shortest day of the month is April 1, with 12 hours, 47 minutes of daylight and the longest day is April 30, with 14 hours, 12 minutes of daylight.
Hours of Daylight and Twilight in April
The latest sunrise of the month in Green Bay is 6:32 AM on April 1 and the earliest sunrise is 49 minutes earlier at 5:43 AM on April 30.
The earliest sunset is 7:19 PM on April 1 and the latest sunset is 36 minutes later at 7:55 PM on April 30.
Daylight saving time is observed in Green Bay 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 5:07 AM and sets 15 hours, 33 minutes later, at 8:40 PM, while on December 21, the shortest day of the year, it rises at 7:25 AM and sets 8 hours, 49 minutes later, at 4:15 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 Green Bay is essentially constant during April, remaining around 0% throughout.
For reference, on July 31, the muggiest day of the year, there are muggy conditions 31% 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 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 Green Bay is essentially constant during April, remaining within 0.2 miles per hour of 6.7 miles per hour throughout.
For reference, on January 14, the windiest day of the year, the daily average wind speed is 7.3 miles per hour, while on August 3, the calmest day of the year, the daily average wind speed is 4.9 miles per hour.
Average Wind Speed in April
Wind Direction in April
Green Bay 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 Green Bay is increasing during April, rising by 4°F, from 35°F to 39°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 Green Bay is increasing during April, rising by 1.1 kWh, from 4.5 kWh to 5.7 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 Green Bay are 44.519 deg latitude, -88.020 deg longitude, and 587 ft elevation.
The topography within 2 miles of Green Bay is essentially flat, with a maximum elevation change of 79 feet and an average elevation above sea level of 591 feet. Within 10 miles is essentially flat (374 feet). Within 50 miles contains only modest variations in elevation (656 feet).
The area within 2 miles of Green Bay is covered by artificial surfaces (96%), within 10 miles by cropland (43%) and artificial surfaces (28%), and within 50 miles by cropland (47%) and water (28%).
This report illustrates the typical weather in Green Bay 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 Green Bay.
For each station, the records are corrected for the elevation difference between that station and Green Bay 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 Green Bay is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Green Bay and a given station.
The stations contributing to this reconstruction are: Austin Straubel International Airport (85%, 10 kilometers, southwest); Manitowoc County Airport (8%, 51 kilometers, southeast); and Door County Cherryland Airport (6%, 60 kilometers, northeast).
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.