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
May comes with an increase, with the average high-temperature moving from a refreshing 64°F (17.8°C) in April to a moderately hot 73.8°F (23.2°C). An average low-temperature of 57.2°F (14°C) marks the nights throughout May.Humidity
In May, the average relative humidity is 80%.Rainfall
In Flat Rock, in May, it is raining for 19.8 days, with typically 3.98" (101mm) of accumulated precipitation. Throughout the year, there are 162.4 rainfall days, and 36.85" (936mm) of precipitation is accumulated.Snowfall
In Flat Rock, snow does not fall in May through October.Daylight
In Flat Rock, the average length of the day in May is 14h and 19min.On the first day of May in Flat Rock, sunrise is at 5:51 am and sunset at 7:43 pm. On the last day of the month, sunrise is at 5:27 am and sunset at 8:09 pm CDT.
Sunshine
The average sunshine in May is 8.7h.UV index
The average daily maximum UV index in May in Flat Rock is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: The maximum UV index of 5 during May leads to these instructions:
Be mindful. Individuals with a lighter skin tone may suffer burns in less than 30 minutes. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.
Frequently asked questions
What is the average May temperature in Flat Rock?
What is the average humidity in May in Flat Rock?
How much does it rain in Flat Rock in May?
When it does not snow in Flat Rock?
Does it snow in Flat Rock in May?
How many hours of daylight does Flat Rock have in May?
What time are sunrise and sunset in May in Flat Rock?
How long on average sun shines in May in Flat Rock?
How high is the UV index in May in Flat Rock?
Average temperature in May
Flat Rock, IL
- Average high temperature in May: 73.8°F
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (36.1°F).
- Average low temperature in May: 57.2°F
The month with the highest average low temperature is July (66.9°F).
The coldest month (with the lowest average low temperature) is January (23.4°F).
Average pressure in May
Flat Rock, IL
- Average pressure in May: 29.97"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
Flat Rock, IL
- Average wind speed in May: 8.1mph
The windiest months (with the highest average wind speed) are January and February (10mph).
The calmest months (with the lowest average wind speed) are July and August (5.9mph).
Average humidity in May
Flat Rock, IL
- Average humidity in May: 80%
The month with the highest relative humidity is July (81%).
The month with the lowest relative humidity is October (71%).
Average rainfall in May
Flat Rock, IL
- Average rainfall in May: 3.98"
The wettest month (with the highest rainfall) is April (5.2").
The driest month (with the least rainfall) is September (1.89").
Average rainfall days in May
Flat Rock, IL
- Average rainfall days in May: 19.8 days
The month with the highest number of rainy days is May (19.8 days).
The month with the least rainy days is January (8.4 days).
Average snowfall in May
Flat Rock, IL
- Average snowfall in May: 0"
The month with the highest snowfall is January (2.32").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in May
Flat Rock, IL
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is January (6.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in May /
Average sunshine in May
Flat Rock, IL
- Average daylight in May: 14h and 2min
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 30min).
- Average sunshine in May: 8h and 4min
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 12min).
Average sunshine days in May
Flat Rock, IL
- Average sunshine days in May: 9.7 days
The month with the most sunshine days is November (18 days).
The month with the least sunshine days is May (9.7 days).
Average UV index in May
Flat Rock, IL
- Average UV index in May: 5
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in May
Flat Rock, IL
- Average cloud cover in May: 42
The month with the most cloud cover is January (Cloud cover 55).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in May
Flat Rock, IL
- 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).
Flat Rock, Illinois, USA
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