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
Saint Johns sees a rise in temperature during May, with average high-temperatures transitioning from an enjoyable 66°F (18.9°C) in April to a warm 75.4°F (24.1°C). In Saint Johns, May is marked by an average low-temperature of 58.1°F (14.5°C).Humidity
With an average relative humidity of 79%, May is the most humid month in Saint Johns.Rainfall
In May, the rain falls for 17 days. Throughout May, 3.27" (83mm) of precipitation is accumulated. In Saint Johns, during the entire year, the rain falls for 147.6 days and collects up to 29.17" (741mm) of precipitation.Snowfall
May through October are months without snowfall.Daylight
In May, the average length of the day in Saint Johns, Illinois, is 14h and 15min.On the first day of the month, sunrise is at 5:59 am and sunset at 7:48 pm. On the last day of May, in Saint Johns, sunrise is at 5:35 am and sunset at 8:13 pm CDT.
Sunshine
The average sunshine in May in Saint Johns is 9.2h.UV index
In Saint Johns, the average daily maximum UV index in May is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for ordinary individuals.Note: In May, an average UV index of 5 transforms into the following instructions:
Exercise caution. Those with pale skin may experience burns in less than half an hour. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.
Frequently asked questions
What are the temperatures in Saint Johns in May?
What is the most humid month in Saint Johns?
What is the average humidity in May in Saint Johns?
How much does it rain in Saint Johns in May?
When it does not snow in Saint Johns?
Does it snow in Saint Johns in May?
What is the average length of the day in May in Saint Johns?
When are sunrise and sunset in May in Saint Johns?
How many hours of sunshine does Saint Johns have in May?
What is the UV index intensity in May in Saint Johns?
Average temperature in May
Saint Johns, IL
- Average high temperature in May: 75.4°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 (38.8°F).
- Average low temperature in May: 58.1°F
The month with the highest average low temperature is July (68.7°F).
The coldest month (with the lowest average low temperature) is January (25.7°F).
Average pressure in May
Saint Johns, IL
- Average pressure in May: 29.96"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in May
Saint Johns, IL
- Average wind speed in May: 7.8mph
The windiest months (with the highest average wind speed) are January and February (9.6mph).
The calmest months (with the lowest average wind speed) are July and August (5.8mph).
Average humidity in May
Saint Johns, 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 (71%).
Average rainfall in May
Saint Johns, IL
- Average rainfall in May: 3.27"
The wettest month (with the highest rainfall) is April (3.58").
The driest month (with the least rainfall) is January (1.5").
Average rainfall days in May
Saint Johns, IL
- Average rainfall days in May: 17 days
The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is December (8.2 days).
Average snowfall in May
Saint Johns, IL
- Average snowfall in May: 0"
The month with the highest snowfall is February (1.5").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in May
Saint Johns, IL
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is January (5.4 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
Saint Johns, IL
- Average daylight in May: 14h and 1min
The month with the longest days is June (Average daylight: 14h and 48min).
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 July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).
Average sunshine days in May
Saint Johns, IL
- Average sunshine days in May: 11.4 days
The months with the most sunshine days are October and November (19.5 days).
The month with the least sunshine days is May (11.4 days).
Average UV index in May
Saint Johns, 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
Saint Johns, IL
- Average cloud cover in May: 39
The months with the most cloud cover are January and February (Cloud cover 50).
The month with the least cloud cover is June (Cloud cover 28).
Average visibility in May
Saint Johns, 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).
Saint Johns, Illinois, USA
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