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's arrival coincides with a rise in the average high-temperature, moving from April's comfortable 66.4°F (19.1°C) to a moderately hot 75.6°F (24.2°C). May witnesses an average nighttime temperature of 58.1°F (14.5°C).Humidity
The most humid month is May, with an average relative humidity of 79%.Rainfall
In Harrisburg, in May, during 18.5 rainfall days, 3.86" (98mm) of precipitation is typically accumulated. Throughout the year, there are 158.6 rainfall days, and 36.02" (915mm) of precipitation is accumulated.Snowfall
In Harrisburg, snow does not fall in May through September.Daylight
The average length of the day in May is 14h and 13min.On the first day of May, sunrise is at 5:57 am and sunset at 7:44 pm. On the last day of the month, sunrise is at 5:33 am and sunset at 8:09 pm CDT.
Sunshine
In May, the average sunshine is 9.2h.UV index
May through August, with an average maximum UV index of 6, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for average individuals.Note: A daily high UV index of 6 in May leads to these guidelines:
Uphold preventive measures and conform to sun safety guidelines. Defending against skin and eye harm is crucial. Stay out of direct sunlight between 10 a.m. and 4 p.m., when UV radiation is most intense, and remember that not all shade structures provide complete protection. 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
What are the temperatures in May?
What is the most humid month?
What is the average humidity in May?
How much does it rain in May?
When it does not snow?
Does it snow in May?
How many hours of daylight does Harrisburg have in May?
When is the sunrise / sunset in May?
How many hours of sunshine does Harrisburg have in May?
What is the month with the highest UV index?
What is the UV index reading in May?
Average temperature in May
Harrisburg, IL
- Average high temperature in May: 75.6°F
The warmest month (with the highest average high temperature) is July (87.3°F).
The month with the lowest average high temperature is January (39.7°F).
- Average low temperature in May: 58.1°F
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (26.2°F).
Average pressure in May
Harrisburg, IL
- Average pressure in May: 29.97"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in May
Harrisburg, IL
- Average wind speed in May: 7.8mph
The windiest months (with the highest average wind speed) are January and February (9.4mph).
The calmest months (with the lowest average wind speed) are July and August (5.8mph).
Average humidity in May
Harrisburg, IL
- Average humidity in May: 79%
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (70%).
Average rainfall in May
Harrisburg, IL
- Average rainfall in May: 3.86"
The wettest month (with the highest rainfall) is April (4.8").
The driest month (with the least rainfall) is September (1.57").
Average rainfall days in May
Harrisburg, IL
- Average rainfall days in May: 18.5 days
The month with the highest number of rainy days is May (18.5 days).
The month with the least rainy days is November (9.7 days).
Average snowfall in May
Harrisburg, IL
- Average snowfall in May: 0"
The month with the highest snowfall is January (1.73").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in May
Harrisburg, IL
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is January (5.3 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
Harrisburg, IL
- Average daylight in May: 14h and 1min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in May: 9h and 1min
The month with the most sunshine is June (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).
Average sunshine days in May
Harrisburg, IL
- Average sunshine days in May: 9.9 days
The month with the most sunshine days is October (19.5 days).
The month with the least sunshine days is May (9.9 days).
Average UV index in May
Harrisburg, IL
- Average UV index in May: 6
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover in May
Harrisburg, IL
- Average cloud cover in May: 38
The months with the most cloud cover are January and February (Cloud cover 51).
The months with the least cloud cover are June and September (Cloud cover 28).
Average visibility in May
Harrisburg, 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).
Harrisburg, Illinois, USA
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