Contents
- Weather in April
- Frequently asked questions
- Average temperature in April
- Average pressure in April
- Average wind speed in April
- Average humidity in April
- Average rainfall in April
- Average rainfall days in April
- Average snowfall in April
- Average snowfall days in April
- Average daylight in April
- Average sunshine in April
- Average sunshine days in April
- Average UV index in April
- Average cloud cover in April
- Average visibility in April
Weather in April
Temperature
Williams Bay sees an increase in the average high-temperature with the arrival of April, moving from March's cold 42.4°F (5.8°C) to a cool 54.1°F (12.3°C). April nights in Williams Bay are marked by an average temperature drop to an icy 37.9°F (3.3°C).Humidity
The months with the lowest humidity in Williams Bay, Wisconsin, are April and October, with an average relative humidity of 77%.Rainfall
In April, the rain falls for 13.7 days. Throughout April, 2.2" (56mm) of precipitation is accumulated. In Williams Bay, Wisconsin, during the entire year, the rain falls for 132.3 days and collects up to 18.7" (475mm) of precipitation.Snowfall
Months with snowfall in Williams Bay are January through April, October through December. April is the last month it regularly snows. During 2.2 snowfall days, in April, Williams Bay aggregates 1.1" (28mm) of snow. In Williams Bay, during the entire year, snow falls for 47.5 days and aggregates up to 11.81" (300mm) of snow.Daylight
The average length of the day in April in Williams Bay is 13h and 25min.On the first day of the month, sunrise is at 6:34 am and sunset at 7:20 pm. On the last day of April, in Williams Bay, Wisconsin, sunrise is at 5:48 am and sunset at 7:53 pm CDT.
Sunshine
In April, the average sunshine is 7.3h.UV index
The average daily maximum UV index in April in Williams Bay is 3. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for average individuals.Note: In April, a regular UV index of 3 translates into these guidelines:
Take necessary precautions - Defending against sun damage is advocated. Avoiding the Sun during its peak radiation time around midday is a healthy practice. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. On your guard! Snow's reflection can almost double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are April temperatures in Williams Bay?
What are the least humid months in Williams Bay?
What is the average humidity in April in Williams Bay?
How many days does it rain in April in Williams Bay?
What is the last month it snows in Williams Bay?
What is the average length of the day in April in Williams Bay?
What time are sunrise and sunset in April in Williams Bay?
How long on average sun shines in April in Williams Bay?
What is the UV index reading in April in Williams Bay?
Average temperature in April
Williams Bay, WI
- Average high temperature in April: 54.1°F
The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (24.8°F).
- Average low temperature in April: 37.9°F
The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is January (12.9°F).
Average pressure in April
Williams Bay, WI
- Average pressure in April: 29.95"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in April
Williams Bay, WI
- Average wind speed in April: 9.9mph
The windiest month (with the highest average wind speed) is April (9.9mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).
Average humidity in April
Williams Bay, WI
- Average humidity in April: 77%
The month with the highest relative humidity is January (87%).
The months with the lowest relative humidity are April and October (77%).
Average rainfall in April
Williams Bay, WI
- Average rainfall in April: 2.2"
The wettest month (with the highest rainfall) is July (2.56").
The driest months (with the least rainfall) are January and December (0.79").
Average rainfall days in April
Williams Bay, WI
- Average rainfall days in April: 13.7 days
The month with the highest number of rainy days is July (17.4 days).
The months with the least rainy days are January and February (3.8 days).
Average snowfall in April
Williams Bay, WI
- Average snowfall in April: 1.1"
The month with the highest snowfall is January (3.35").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in April
Williams Bay, WI
- Average snowfall days in April: 2.2 days
The month with the highest number of snowfall days is January (13.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in April /
Average sunshine in April
Williams Bay, WI
- Average daylight in April: 13h and 2min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in April: 7h and 2min
The months with the most sunshine are July and August (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).
Average sunshine days in April
Williams Bay, WI
- Average sunshine days in April: 13.1 days
The month with the most sunshine days is November (18.9 days).
The month with the least sunshine days is July (10.8 days).
Average UV index in April
Williams Bay, WI
- Average UV index in April: 3
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in April
Williams Bay, WI
- Average cloud cover in April: 51
The month with the most cloud cover is January (Cloud cover 64).
The months with the least cloud cover are July, August and September (Cloud cover 35).
Average visibility in April
Williams Bay, WI
- Average visibility in April: 6mi
The months with the highest visibility are March, April, May, June, October, November and December (6mi).
The months with the lowest visibility are January, February, July, August and September (5mi).
Williams Bay, Wisconsin, USA
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