Contents
- Weather in May
- Frequently asked questions
- Average temperature in May
- Average pressure in May
- Average wind speed in May
- Average humidity in May
- Average rainfall in May
- Average rainfall days in May
- Average snowfall in May
- Average snowfall days in May
- Average daylight in May
- Average sunshine in May
- Average sunshine days in May
- Average UV index in May
- Average cloud cover in May
- Average visibility in May
Weather in May
Temperature
In Forreston, the average high-temperature in May increases from a refreshing 56.5°F (13.6°C) in April to a pleasant 68.5°F (20.3°C). Throughout May nights, Forreston experiences a consistent temperature average of 51.4°F (10.8°C).Humidity
In May, the average relative humidity is 79%.Rainfall
In Forreston, Illinois, in May, it is raining for 18.3 days, with typically 3.19" (81mm) of accumulated precipitation. Throughout the year, in Forreston, there are 145.6 rainfall days, and 23.43" (595mm) of precipitation is accumulated.Snowfall
May through September are months without snowfall.Daylight
The average length of the day in May is 14h and 36min.On the first day of the month, sunrise is at 5:52 am and sunset at 7:57 pm. On the last day of May, sunrise is at 5:24 am and sunset at 8:27 pm CDT.
Sunshine
The average sunshine in May is 8.4h.UV index
May through August, with an average maximum UV index of 5, are months with the highest UV index. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for the ordinary person.Note: The maximum daily UV index of 5 during May translates into the following directions:
Guard yourself - An obligation to protect skin and eyes from harm exists. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average May temperature in Forreston?
What is the average humidity in May in Forreston?
How many days does it rain in May in Forreston?
When it does not snow in Forreston?
Does it snow in Forreston in May?
How many hours of daylight does Forreston have in May?
When is the sunrise / sunset in May in Forreston?
How long on average sun shines in May in Forreston?
What is the month with the highest UV index in Forreston?
What is the UV index reading in May in Forreston?
Average temperature in May
Forreston, IL
- Average high temperature in May: 68.5°F
The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is January (26.1°F).
- Average low temperature in May: 51.4°F
The month with the highest average low temperature is July (63.5°F).
The coldest month (with the lowest average low temperature) is January (13.5°F).
Average pressure in May
Forreston, IL
- Average pressure in May: 29.95"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in May
Forreston, IL
- Average wind speed in May: 8.8mph
The windiest month (with the highest average wind speed) is April (10.3mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).
Average humidity in May
Forreston, IL
- Average humidity in May: 79%
The month with the highest relative humidity is January (87%).
The months with the lowest relative humidity are April and October (75%).
Average rainfall in May
Forreston, IL
- Average rainfall in May: 3.19"
The wettest month (with the highest rainfall) is June (3.39").
The driest months (with the least rainfall) are February and December (1.06").
Average rainfall days in May
Forreston, IL
- Average rainfall days in May: 18.3 days
The month with the highest number of rainy days is May (18.3 days).
The month with the least rainy days is February (5 days).
Average snowfall in May
Forreston, IL
- Average snowfall in May: 0"
The month with the highest snowfall is January (3.54").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in May
Forreston, IL
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is January (12.4 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
Forreston, IL
- Average daylight in May: 14h and 4min
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 2min
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
Forreston, IL
- Average sunshine days in May: 10.5 days
The month with the most sunshine days is November (17.2 days).
The month with the least sunshine days is June (9.7 days).
Average UV index in May
Forreston, 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 and December (UV index 1).
Average cloud cover in May
Forreston, IL
- Average cloud cover in May: 44
The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is September (Cloud cover 33).
Average visibility in May
Forreston, IL
- Average visibility in May: 6mi
The months with the highest visibility are March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, February, July and August (5mi).
Forreston, Illinois, USA
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