This report describes the typical weather at the Austin Straubel International Airport (Green Bay, Wisconsin, United States) weather station over the course of an average April. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.
Green Bay, Wisconsin has a humid continental climate with warm summers and no dry season. The area within 25 mi of this station is covered by grasslands (47%), croplands (41%), oceans and seas (8%), and built-up areas (3%).
The month of April is characterized by rapidly rising daily high temperatures, with daily highs increasing from 47°F to 61°F over the course of the month, exceeding 74°F or dropping below 34°F only one day in ten.
Over the course of April, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 1:24 hours, implying an average day-over-day increase of 2.8 minutes.
The shortest day of the month is April 1 with 12:48 hours of daylight; the longest day is April 30 with 14:13 hours of daylight.
The earliest sunrise is at 5:44am on April 30; the latest sunset is at 7:56pm on April 30; the latest sunrise is at 6:32am on April 1; the earliest sunset is at 7:21pm on April 1.
Daylight savings time is observed in 2012 but it neither starts nor ends in April, so the entire month is in daylight time.
The median cloud cover ranges from 62% (partly cloudy) to 70% (partly cloudy). The trend is for the sky to be clearing with the median cloud cover decreasing by 8% from the start to the end of the month.
On April 15, a representative day, the sky is clear or mostly clear 43% of the time, partly cloudy 10% of the time, and mostly cloudy or overcast 48% of the time.
The average probability that some form of precipitation will be observed in a given day is 48%, with little variation over the course of the month.
Throughout April, the most common forms of precipitation are light rain, light snow, moderate rain, and thunderstorms.
Light rain is the most severe precipitation observed during 29% of those days with precipitation. It is most likely around April 30, when it is observed during 16% of all days.
Light snow is the most severe precipitation observed during 24% of those days with precipitation. It is most likely around April 1, when it is observed during 18% of all days.
Moderate rain is the most severe precipitation observed during 24% of those days with precipitation. It is most likely around April 29, when it is observed during 14% of all days.
Thunderstorms are the most severe precipitation observed during 11% of those days with precipitation. They are most likely around April 30, when it is observed during 7% of all days.
The likelihood of snow falling is highest around April 1, occurring in 25% of days.
Accumulation at this location in April is unlikely. The chances of there being snow on the ground are highest around April 1, occurring 21% of the time.
The snow is typically at its deepest on April 30, with a median depth of 13.4"; the depth exceeds 43.7" only one year out of ten.
The relative humidity typically ranges from 43% (comfortable) to 87% (very humid) over the course of a typical April, rarely dropping below 26% (dry) and reaching as high as 100% (very humid).
The air is driest around April 27, at which time the relative humidity drops below 52% (mildly humid) three days out of four; it is most humid around April 1, rising above 81% (humid) three days out of four.
Dew point is often a better measure of how comfortable a person will find the weather than relative humidity because it more directly relates to whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid.
Over the course of a typical April, the dew point typically varies from 22°F (dry) to 43°F (dry) and is rarely below 11°F (dry) or above 56°F (comfortable).
Over the course of April typical wind speeds vary from 3 mph to 18 mph (light air to fresh breeze), rarely exceeding 25 mph (strong breeze).
The highest average wind speed of 11 mph (gentle breeze) occurs around April 7, at which time the average daily maximum wind speed is 18 mph (moderate breeze).
The lowest average wind speed of 10 mph (gentle breeze) occurs around April 30, at which time the average daily maximum wind speed is 17 mph (moderate breeze).