May weather forecastCissna Park, IL
May
Weather in May
The last month of the spring, May, is an agreeable month in Cissna Park, Illinois, with temperature in the range of an average low of 55°F (12.8°C) and an average high of 71.4°F (21.9°C).Temperature
As Cissna Park transitions into May, the average high-temperature shows a change, moving from a refreshing 60.1°F (15.6°C) in April to an agreeable 71.4°F (21.9°C). During the month of May, the temperature generally drops to a low average of 55°F (12.8°C).Humidity
In Cissna Park, the average relative humidity in May is 77%.Rainfall
The month with the most rainfall is May, when the rain falls for 18 days and typically aggregates up to 3.07" (78mm) of precipitation.Snowfall
May through September are months without snowfall in Cissna Park.Daylight
In May, the average length of the day is 14h and 28min.On the first day of May, sunrise is at 5:49 am and sunset at 7:47 pm. On the last day of the month, sunrise is at 5:23 am and sunset at 8:15 pm CDT.
Sunshine
In May, the average sunshine in Cissna Park is 8.8h.UV index
In May, the average daily maximum UV index in Cissna Park is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for the ordinary person.Note: The UV index of 5 during May translates into the following guidance:
Be vigilant - A duty to shield skin and eyes from injury exists. 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.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Cissna Park, IL
- Average high temperature in May: 71.4°F
The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (31.1°F).
- Average low temperature in May: 55°F
The month with the highest average low temperature is July (64.4°F).
The coldest month (with the lowest average low temperature) is January (19°F).
Average pressure in May
Cissna Park, IL
- Average pressure in May: 29.96"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in May
Cissna Park, IL
- Average wind speed in May: 8.8mph
The windiest month (with the highest average wind speed) is January (10.5mph).
The calmest months (with the lowest average wind speed) are July and August (6.3mph).
Average humidity in May
Cissna Park, IL
- Average humidity in May: 77%
The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (71%).
Average rainfall in May
Cissna Park, IL
- Average rainfall in May: 3.07"
The wettest month (with the highest rainfall) is May (3.07").
The driest month (with the least rainfall) is February (1.14").
Average rainfall days in May
Cissna Park, IL
- Average rainfall days in May: 18 days
The month with the highest number of rainy days is May (18 days).
The month with the least rainy days is January (6.4 days).
Average snowfall in May
Cissna Park, IL
- Average snowfall in May: 0"
The month with the highest snowfall is January (2.91").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in May
Cissna Park, IL
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is January (10.4 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
Cissna Park, IL
- Average daylight in May: 14h and 30min
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 18min).
- Average sunshine in May: 8h and 48min
The month with the most sunshine is June (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days in May
Cissna Park, IL
- Average sunshine days in May: 11 days
The month with the most sunshine days is November (19.6 days).
The month with the least sunshine days is June (10.3 days).
Average UV index in May
Cissna Park, 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
Cissna Park, IL
- Average cloud cover in May: 42
The month with the most cloud cover is January (Cloud cover 59).
The months with the least cloud cover are August and September (Cloud cover 33).
Average visibility in May
Cissna Park, 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).
