Green Bay
Wisconsin, USA
Long-term weather forecast
Long-term weather forecast

April weather forecast and climate
Green Bay, WI

An aerial panorama of the sun setting over Green Bay in Wisconsin
An aerial panorama of the sun setting over Green Bay in Wisconsin
April is a fresh spring month in Green Bay, Wisconsin, with average temperature ranging between min 33.8°F (1°C) and max 54°F (12.2°C).

Temperature

In Green Bay, the average high-temperature in April significantly increases, from a cold 39.2°F (4°C) in March, to a fresh 54°F (12.2°C). In April, the average low-temperature is 33.8°F (1°C).

Humidity

In April, the average relative humidity is 67%.

Rainfall

In Green Bay, during April, the rain falls for 11.1 days and regularly aggregates up to 2.6" (66.8mm) of precipitation. In Green Bay, during the entire year, the rain falls for 123 days and collects up to 29.5" (749.9mm) of precipitation.

Snowfall

Months with snowfall in Green Bay are January through May, October through December. In Green Bay, Wisconsin, in April, snow falls for 2.5 days, with typically accumulated 2.9" (73.7mm) of snow. Throughout the year, in Green Bay, there are 40.2 snowfall days, and 51.4" (1305.6mm) of snow is accumulated.

Ocean temperature

In April, the average ocean temperature in Green Bay, Wisconsin, is 38.8°F (3.8°C).
Note: For swimming, this is considered life-threatening and very dangerous. The water feels painfully cold, and hyperventilation quickly occurs. A specialized swimsuit is mandatory to reduce thermal damage.

Daylight

In April, the average length of the day in Green Bay, Wisconsin, is 13.5h.

Sunshine

In April, the average sunshine is 7.4h.

UV index

In April, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from unsafe exposure to the UV radiation for average individuals.
Note: The average daily UV index of 5 in April transform into the following instructions:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the temperature in April in Green Bay?

In April, in Green Bay, the average high-temperature is 54°F (12.2°C), and the average low-temperature is 33.8°F (1°C).

What is the average humidity in April in Green Bay?

In April, the average relative humidity in Green Bay, Wisconsin, is 67%.

How many days does it rain in April in Green Bay?

In Green Bay, in April, it is raining for 11.1 days, with typically 2.6" (66.8mm) of accumulated precipitation.

How much does it snow in Green Bay in April?

In Green Bay, Wisconsin, in April, snow falls for 2.5 days, with typically accumulated 2.9" (73.7mm) of snow.

What is the ocean temperature in April in Green Bay?

In April, the average ocean temperature in Green Bay is 38.8°F (3.8°C). For swimming, this is considered life-threatening and very dangerous. The water feels painfully cold, and hyperventilation quickly occurs. A specialized swimsuit is mandatory to reduce thermal damage.

How many hours of daylight does Green Bay have in April?

The average length of the day in April in Green Bay, Wisconsin, is 13.5h.

How many hours of sunshine does Green Bay have in April?

In Green Bay, Wisconsin, the average sunshine in April is 7.4h.

What is the UV index reading in April in Green Bay?

In Green Bay, Wisconsin, the average daily maximum UV index in April is 5. A UV Index reading of 3 to 5 represents a medium hazard to health from unsafe exposure to the Sun's UV rays.
Average temperature in April - Green Bay, WI
  • Average high temperature in April: 53.9°F

The warmest month (with the highest average high temperature) is July (79.8°F).
The month with the lowest average high temperature is January (24.3°F).

  • Average low temperature in April: 33.8°F

The month with the highest average low temperature is July (58.4°F).
The coldest month (with the lowest average low temperature) is January (9°F).

Average humidity in April - Green Bay, WI
  • Average humidity in April: 67%

The month with the highest relative humidity is December (77.3%).
The month with the lowest relative humidity is May (65.9%).

Average rainfall in April - Green Bay, WI
  • Average rainfall in April: 2.6"

The wettest month (with the highest rainfall) is June (3.9").
Driest months (with the lowest rainfall) are January and February (1.1").

Average rainfall days in April - Green Bay, WI
  • Average rainfall days in April: 11.1 days

The month with the highest number of rainy days is May (11.4 days).
The month with the lowest number of rainy days is February (8.4 days).

Average snowfall in April - Green Bay, WI
  • Average snowfall in April: 2.9"

The month with the highest snowfall is December (13.1").
Months with the lowest snowfall are June, July, August and September (0").

Average snowfall days in April - Green Bay, WI
  • Average snowfall days in April: 2.5 days

The month with the highest number of snowfall days is January (9.6 days).
Months with the lowest number of snowfall days are June, July, August and September (0 days).

Average sea temperature in April - Green Bay, WI
  • Average sea temperature in April: 38.8°F

The best month for swimming (with the highest average sea temperature) is August (67.6°F).
The coldest month (with the lowest average sea temperature) is February (36.1°F).

Average daylight in April / Average sunshine in April - Green Bay, WI
  • Average daylight in April: 13.5h

The month with the longest days is June (Average daylight: 15.5h).
The month with shortest days is December (Average daylight: 8.9h).

  • Average sunshine in April: 7.4h

Months with most sunshine are June and July (Average sunshine: 10.1h).
Months with least sunshine are November and December (Average sunshine: 3.6).

Average UV index in April - Green Bay, WI
  • Average UV index in April: 5

Months with the highest UV index are June and July (UV index 8).
Months with the lowest UV index are January and December (UV index 1).