May weather forecastMattoon, WI
May
Weather in May
May, the last month of the spring in Mattoon, is a refreshing month, with temperature in the range of an average high of 64.8°F (18.2°C) and an average low of 45.1°F (7.3°C).Temperature
With the onset of May, the average high-temperature slightly shifts from April's cool 50.5°F (10.3°C) to a comfortable 64.8°F (18.2°C). Throughout May, Mattoon registers a consistent average low-temperature of 45.1°F (7.3°C).Humidity
The months with the lowest humidity in Mattoon are April and May, with an average relative humidity of 75%.Rainfall
The month with the most rainfall is May, when the rain falls for 15.1 days and typically aggregates up to 3.19" (81mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. May is the last month it regularly snows. During 0.2 snowfall days, in May, Mattoon aggregates 0.35" (9mm) of snow. Throughout the year, there are 62 snowfall days, and 22.2" (564mm) of snow is accumulated.Daylight
In May, the average length of the day in Mattoon is 14h and 52min.On the first day of May, sunrise is at 5:44 am and sunset at 8:02 pm. On the last day of the month, sunrise is at 5:12 am and sunset at 8:35 pm CDT.
Sunshine
In May, the average sunshine in Mattoon is 8.8h.UV index
In Mattoon, the average daily maximum UV index in May is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for the average person.Note: A daily high UV index of 4 in May leads to these guidelines:
Put precautions into practice - Guidance to elude sunburn is provided. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Bear in mind! The Sun's UV radiation can nearly double in intensity due to the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Mattoon, WI
- Average high temperature in May: 64.8°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 (22.3°F).
- Average low temperature in May: 45.1°F
The month with the highest average low temperature is July (59°F).
The coldest month (with the lowest average low temperature) is January (11.5°F).
Average pressure in May
Mattoon, WI
- Average pressure in May: 29.96"Hg
The months with the highest atmospheric pressure are February and March (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in May
Mattoon, WI
- Average wind speed in May: 8.1mph
The windiest month (with the highest average wind speed) is April (9.1mph).
The calmest month (with the lowest average wind speed) is August (6.7mph).
Average humidity in May
Mattoon, WI
- Average humidity in May: 75%
The months with the highest relative humidity are January and February (88%).
The months with the lowest relative humidity are April and May (75%).
Average rainfall in May
Mattoon, WI
- Average rainfall in May: 3.19"
The wettest month (with the highest rainfall) is May (3.19").
The driest months (with the least rainfall) are January and February (1.02").
Average rainfall days in May
Mattoon, WI
- Average rainfall days in May: 15.1 days
The month with the highest number of rainy days is May (15.1 days).
The months with the least rainy days are January and February (4.3 days).
Average snowfall in May
Mattoon, WI
- Average snowfall in May: 0.35"
The month with the highest snowfall is January (5.28").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Mattoon, WI
- Average snowfall days in May: 0.2 days
The month with the highest number of snowfall days is January (15.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Mattoon, WI
- Average daylight in May: 14h and 54min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in May: 8h and 48min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is February (Average sunshine: 3h and 30min).
Average sunshine days in May
Mattoon, WI
- Average sunshine days in May: 13.6 days
The month with the most sunshine days is November (16.6 days).
The month with the least sunshine days is April (12.7 days).
Average UV index in May
Mattoon, WI
- Average UV index in May: 4
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, November and December (UV index 1).
Average cloud cover in May
Mattoon, WI
- Average cloud cover in May: 42
The months with the most cloud cover are January and February (Cloud cover 63).
The month with the least cloud cover is July (Cloud cover 33).
Average visibility in May
Mattoon, WI
- Average visibility in May: 6mi
The months with the highest visibility are March, April, May, June, July, October, November and December (6mi).
The months with the lowest visibility are January, February, August and September (5mi).
