May weather forecastRockford, IL
May
Weather in May
May experiences another jump in temperatures, heralding the arrival of the warmer seasons in Rockford. The conditions shift noticeably from spring towards early summer vibes, with an average high of 68.5°F (20.3°C) and a low of 50.9°F (10.5°C). The month of May is characterized by the highest daily average relative humidity of 78% with the moderate rainfall has an impact on the humidity, making the days feel slightly warmer. Though showers are quite prevalent throughout May, it doesn't stop residents and tourists from taking advantage of the increasingly warm temperatures and enjoying the outdoors. The increase in temperature and consistent rainfall encourages much of Rockford's natural beauty to flourish, making it an ideal time for nature walks and gardening.Temperature
May brings a rise in Rockford's average high-temperature, moving from a moderate 55.9°F (13.3°C) in April to an agreeable 68.5°F (20.3°C). In May, the recorded average low-temperature in Rockford is a fresh 50.9°F (10.5°C).Humidity
In May, the average relative humidity in Rockford is 78%.Rainfall
In Rockford, Illinois, in May, during 19 rainfall days, 3.86" (98mm) of precipitation is typically accumulated. Throughout the year, in Rockford, Illinois, there are 148.1 rainfall days, and 28.39" (721mm) of precipitation is accumulated.Snowfall
In Rockford, snow does not fall in May through September.Daylight
In Rockford, the average length of the day in May is 14h and 37min.On the first day of the month, sunrise is at 5:50 am and sunset at 7:56 pm. On the last day of May, in Rockford, sunrise is at 5:22 am and sunset at 8:25 pm CDT.
Sunshine
In May, the average sunshine is 8.5h.UV index
May through August, with an average maximum UV index of 5, are months with the highest UV index in Rockford. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for ordinary individuals.Note: The UV index of 5 during May leads to these advisories:
Exercise prevention - Protecting skin and eyes from harm is required. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Rockford, IL
- Average high temperature in May: 68.5°F
The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (26.2°F).
- Average low temperature in May: 50.9°F
The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (13.8°F).
Average pressure in May
Rockford, IL
- Average pressure in May: 29.96"Hg
The months with the highest atmospheric pressure are January and February (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in May
Rockford, IL
- Average wind speed in May: 8.6mph
The windiest month (with the highest average wind speed) is April (10.1mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).
Average humidity in May
Rockford, IL
- Average humidity in May: 78%
The month with the highest relative humidity is January (86%).
The months with the lowest relative humidity are April and October (75%).
Average rainfall in May
Rockford, IL
- Average rainfall in May: 3.86"
The wettest month (with the highest rainfall) is June (4.02").
The driest month (with the least rainfall) is February (1.26").
Average rainfall days in May
Rockford, IL
- Average rainfall days in May: 19 days
The month with the highest number of rainy days is May (19 days).
The month with the least rainy days is February (4.3 days).
Average snowfall in May
Rockford, IL
- Average snowfall in May: 0"
The month with the highest snowfall is January (4.88").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in May
Rockford, IL
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is January (13 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
Rockford, IL
- Average daylight in May: 14h and 36min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in May: 8h and 30min
The month with the most sunshine is July (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in May
Rockford, IL
- Average sunshine days in May: 10.2 days
The month with the most sunshine days is November (17.1 days).
The month with the least sunshine days is June (9.8 days).
Average UV index in May
Rockford, IL
- Average UV index in May: 5
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, November and December (UV index 1).
Average cloud cover in May
Rockford, IL
- Average cloud cover in May: 43
The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is September (Cloud cover 33).
Average visibility in May
Rockford, IL
- Average visibility in May: 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).
