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
Petersburg in May experiences an increase in the average high-temperature, moving from April's enjoyable 63°F (17.2°C) to a pleasant 72.9°F (22.7°C). During May, Petersburg consistently records a temperature low averaging a mild 55.9°F (13.3°C).Humidity
In May, the average relative humidity is 77%.Rainfall
The month with the most rainfall in Petersburg is May, when the rain falls for 18.3 days and typically aggregates up to 3.82" (97mm) of precipitation.Snowfall
May through September are months without snowfall in Petersburg.Daylight
In May, the average length of the day is 14h and 25min.On the first day of May in Petersburg, sunrise is at 5:58 am and sunset at 7:54 pm. On the last day of the month, sunrise is at 5:32 am and sunset at 8:21 pm CDT.
Sunshine
In Petersburg, Illinois, the average sunshine in May is 9.1h.UV index
In May, the average daily maximum UV index in Petersburg is 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: In May, the maximum UV index of 5 translates into these guidelines:
Put precautions into practice - Protective measures against sun-induced damage are advised. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Petersburg in May?
What is the average humidity in May in Petersburg?
What is the wettest month in Petersburg?
How much does it rain in Petersburg in May?
When it does not snow in Petersburg?
Does it snow in Petersburg in May?
What is the average length of the day in May in Petersburg?
When are sunrise and sunset in May in Petersburg?
How many hours of sunshine does Petersburg have in May?
What is the UV index reading in May in Petersburg?
Average temperature in May
Petersburg, IL
- Average high temperature in May: 72.9°F
The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is January (32.9°F).
- Average low temperature in May: 55.9°F
The month with the highest average low temperature is July (66°F).
The coldest month (with the lowest average low temperature) is January (20.7°F).
Average pressure in May
Petersburg, IL
- Average pressure in May: 29.95"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in May
Petersburg, IL
- Average wind speed in May: 8.6mph
The windiest months (with the highest average wind speed) are January, February and April (10.3mph).
The calmest months (with the lowest average wind speed) are July and August (6.3mph).
Average humidity in May
Petersburg, IL
- Average humidity in May: 77%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (70%).
Average rainfall in May
Petersburg, IL
- Average rainfall in May: 3.82"
The wettest month (with the highest rainfall) is May (3.82").
The driest month (with the least rainfall) is December (1.5").
Average rainfall days in May
Petersburg, 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 (6.2 days).
Average snowfall in May
Petersburg, IL
- Average snowfall in May: 0"
The month with the highest snowfall is January (4.02").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in May
Petersburg, IL
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is January (10.3 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
Petersburg, IL
- Average daylight in May: 14h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in May: 9h and 1min
The month with the most sunshine is June (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in May
Petersburg, IL
- Average sunshine days in May: 11.3 days
The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is May (11.3 days).
Average UV index in May
Petersburg, 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
Petersburg, IL
- Average cloud cover in May: 40
The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility in May
Petersburg, IL
- Average visibility in May: 6mi
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
Petersburg, Illinois, USA
Weather forecast for your location
2. Allow the app to use your location