May weather forecastGrafton, WI
May
Weather in May
The last month of the spring, May, is a moderate month in Grafton, Wisconsin, with an average temperature ranging between max 59.5°F (15.3°C) and min 46.8°F (8.2°C).Temperature
May's onset witnesses a shift in the average high-temperature, moving from a frosty 48.6°F (9.2°C) in April to a refreshing 59.5°F (15.3°C). During the month of May, an average low-temperature of 46.8°F (8.2°C) is recorded.Humidity
The average relative humidity in May is 79%.Rainfall
In May, the rain falls for 15.8 days. Throughout May, 2.76" (70mm) of precipitation is accumulated. In Grafton, during the entire year, the rain falls for 134.9 days and collects up to 23.94" (608mm) of precipitation.Snowfall
In Grafton, snow does not fall in May through September.Daylight
In May, the average length of the day is 14h and 43min.On the first day of May, sunrise is at 5:43 am and sunset at 7:54 pm. On the last day of the month, sunrise is at 5:14 am and sunset at 8:24 pm CDT.
Sunshine
In May, the average sunshine in Grafton is 8.7h.UV index
In Grafton, the average daily maximum UV index in May is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for average individuals.Note: The maximum UV index, 4 during May, leads to the following recommendations:
Undertake precautions - Guarding against sun damage is counselled. When the Sun is at its strongest around midday, find shade and limit exposure. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly. Mark this! Snow reflection can nearly double the UV radiation intensity from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Grafton, WI
- Average high temperature in May: 59.5°F
The warmest month (with the highest average high temperature) is July (76.1°F).
The month with the lowest average high temperature is January (25.5°F).
- Average low temperature in May: 46.8°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (15.8°F).
Average pressure in May
Grafton, WI
- Average pressure in May: 29.96"Hg
The months with the highest atmospheric pressure are January, February and March (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in May
Grafton, WI
- Average wind speed in May: 9.2mph
The windiest month (with the highest average wind speed) is January (12.1mph).
The calmest month (with the lowest average wind speed) is July (7.5mph).
Average humidity in May
Grafton, WI
- Average humidity in May: 79%
The month with the highest relative humidity is January (86%).
The months with the lowest relative humidity are April, October and November (77%).
Average rainfall in May
Grafton, WI
- Average rainfall in May: 2.76"
The wettest month (with the highest rainfall) is July (2.99").
The driest month (with the least rainfall) is February (0.98").
Average rainfall days in May
Grafton, WI
- Average rainfall days in May: 15.8 days
The month with the highest number of rainy days is May (15.8 days).
The month with the least rainy days is February (3.8 days).
Average snowfall in May
Grafton, WI
- Average snowfall in May: 0"
The month with the highest snowfall is January (3.43").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in May
Grafton, WI
- Average snowfall days in May: 0.1 days
The month with the highest number of snowfall days is January (12.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Grafton, WI
- Average daylight in May: 14h and 42min
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 0min).
- Average sunshine in May: 8h and 42min
The months with the most sunshine are July and August (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in May
Grafton, WI
- Average sunshine days in May: 12.9 days
The month with the most sunshine days is December (16.4 days).
The month with the least sunshine days is July (11.6 days).
Average UV index in May
Grafton, WI
- Average UV index in May: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, November and December (UV index 1).
Average cloud cover in May
Grafton, WI
- Average cloud cover in May: 42
The month with the most cloud cover is January (Cloud cover 63).
The months with the least cloud cover are July and August (Cloud cover 28).
Average visibility in May
Grafton, WI
- Average visibility in May: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
