May weather forecastRock City, IL
May
Weather in May
May, the last month of the spring in Rock City, is a pleasant month, with an average temperature fluctuating between 68°F (20°C) and 50.9°F (10.5°C).Temperature
With the onset of May, Rock City's average high-temperature experiences a rise, moving from April's mild 55.9°F (13.3°C) to an agreeable 68°F (20°C). In the month of May, Rock City's average low-temperature falls to a cool 50.9°F (10.5°C).Humidity
The average relative humidity in May in Rock City is 79%.Rainfall
In May, the rain falls for 17.4 days. Throughout May, 2.6" (66mm) of precipitation is accumulated. In Rock City, during the entire year, the rain falls for 138 days and collects up to 19.69" (500mm) of precipitation.Snowfall
In Rock City, snow does not fall in May through September.Daylight
In May, the average length of the day is 14h and 37min.On the first day of May in Rock City, Illinois, sunrise is at 5:51 am and sunset at 7:58 pm. On the last day of the month, sunrise is at 5:23 am and sunset at 8:27 pm CDT.
Sunshine
In Rock City, 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 value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for the average person.Note: The daily high UV index of 5 during May translates into the following recommendations:
Be mindful. Individuals with a lighter skin tone may suffer burns in less than 30 minutes. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Rock City, IL
- Average high temperature in May: 68°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 (25.2°F).
- Average low temperature in May: 50.9°F
The month with the highest average low temperature is July (62.8°F).
The coldest month (with the lowest average low temperature) is January (13.1°F).
Average pressure in May
Rock City, IL
- Average pressure in May: 29.96"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
Rock City, 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
Rock City, IL
- Average humidity in May: 79%
The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is October (75%).
Average rainfall in May
Rock City, IL
- Average rainfall in May: 2.6"
The wettest month (with the highest rainfall) is June (2.87").
The driest month (with the least rainfall) is December (0.83").
Average rainfall days in May
Rock City, IL
- Average rainfall days in May: 17.4 days
The month with the highest number of rainy days is May (17.4 days).
The month with the least rainy days is January (4.9 days).
Average snowfall in May
Rock City, IL
- Average snowfall in May: 0"
The month with the highest snowfall is January (2.99").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in May
Rock City, IL
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is January (11.3 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
Rock City, 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 6min).
- Average sunshine in May: 8h and 24min
The months with the most sunshine are July and August (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in May
Rock City, IL
- Average sunshine days in May: 11.3 days
The month with the most sunshine days is November (17.7 days).
The month with the least sunshine days is June (10.5 days).
Average UV index in May
Rock City, 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
Rock City, 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 32).
Average visibility in May
Rock City, 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).
