May weather forecastMattoon, IL
May
Weather in May
May, the last month of the spring in Mattoon, is a pleasant month, with an average temperature fluctuating between 73°F (22.8°C) and 56.7°F (13.7°C).Temperature
May's arrival is marked by an increase in the average high-temperature, moving from a refreshing 62.2°F (16.8°C) in April to an agreeable 73°F (22.8°C). Mattoon's average low-temperature is measured at a mild 56.7°F (13.7°C) during May.Humidity
The average relative humidity in May is 79%.Rainfall
In Mattoon, in May, during 16.8 rainfall days, 2.87" (73mm) of precipitation is typically accumulated. In Mattoon, during the entire year, the rain falls for 148 days and collects up to 25.63" (651mm) of precipitation.Snowfall
May through September are months without snowfall.Daylight
In May, the average length of the day is 14h and 22min.On the first day of May, sunrise is at 5:53 am and sunset at 7:47 pm. On the last day of the month, sunrise is at 5:28 am and sunset at 8:14 pm CDT.
Sunshine
In Mattoon, the average sunshine in May is 8.8h.UV index
In Mattoon, the average daily maximum UV index in May is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for the ordinary person.Note: In May, the maximum UV index of 5 transforms into these recommendations:
Exercise prudence. Persons with fair skin could be burned in under 30 minutes. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Mattoon, IL
- Average high temperature in May: 73°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (34°F).
- Average low temperature in May: 56.7°F
The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (21.9°F).
Average pressure in May
Mattoon, IL
- Average pressure in May: 29.96"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in May
Mattoon, IL
- Average wind speed in May: 8.6mph
The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest month (with the lowest average wind speed) is July (6.2mph).
Average humidity in May
Mattoon, IL
- Average humidity in May: 79%
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (70%).
Average rainfall in May
Mattoon, IL
- Average rainfall in May: 2.87"
The wettest month (with the highest rainfall) is April (3.31").
The driest month (with the least rainfall) is February (1.3").
Average rainfall days in May
Mattoon, IL
- Average rainfall days in May: 16.8 days
The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is February (7.8 days).
Average snowfall in May
Mattoon, IL
- Average snowfall in May: 0"
The month with the highest snowfall is December (2.13").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in May
Mattoon, IL
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is January (8.1 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Mattoon, IL
- Average daylight in May: 14h and 24min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in May: 8h and 48min
The month with the most sunshine is June (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days in May
Mattoon, IL
- Average sunshine days in May: 11.2 days
The month with the most sunshine days is October (18.3 days).
The month with the least sunshine days is July (10.6 days).
Average UV index in May
Mattoon, IL
- Average UV index in May: 5
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in May
Mattoon, IL
- Average cloud cover in May: 41
The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is June (Cloud cover 31).
Average visibility in May
Mattoon, IL
- Average visibility in May: 6mi
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
