May weather forecastSeneca, IL
May
Weather in May
May, the last month of the spring in Seneca, is a pleasant month, with temperature in the range of an average high of 70.7°F (21.5°C) and an average low of 53.8°F (12.1°C).Temperature
The start of May brings a rise in the average high-temperature, moving from a moderate 58.8°F (14.9°C) in April to an agreeable 70.7°F (21.5°C). Seneca's average low-temperature in the month of May is recorded at a cool 53.8°F (12.1°C).Humidity
In Seneca, Illinois, the average relative humidity in May is 76%.Rainfall
The month with the most rainfall is May, when the rain falls for 18.3 days and typically aggregates up to 4.49" (114mm) of precipitation.Snowfall
May through September are months without snowfall.Daylight
In Seneca, the average length of the day in May is 14h and 31min.On the first day of the month, sunrise is at 5:50 am and sunset at 7:52 pm. On the last day of May, in Seneca, Illinois, sunrise is at 5:23 am and sunset at 8:20 pm CDT.
Sunshine
The average sunshine in May is 8.9h.UV index
The average daily maximum UV index in May in Seneca is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: A maximum high daily UV index of 5 during May translates into the following directions:
Put precautions into practice - Protective measures against sun-induced damage are advised. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Seneca, IL
- Average high temperature in May: 70.7°F
The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (29.1°F).
- Average low temperature in May: 53.8°F
The month with the highest average low temperature is July (64.2°F).
The coldest month (with the lowest average low temperature) is January (17.2°F).
Average pressure in May
Seneca, 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 (29.92"Hg).
Average wind speed in May
Seneca, IL
- Average wind speed in May: 8.6mph
The windiest months (with the highest average wind speed) are January and April (10.1mph).
The calmest month (with the lowest average wind speed) is August (6.1mph).
Average humidity in May
Seneca, IL
- Average humidity in May: 76%
The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (72%).
Average rainfall in May
Seneca, IL
- Average rainfall in May: 4.49"
The wettest month (with the highest rainfall) is May (4.49").
The driest month (with the least rainfall) is December (1.65").
Average rainfall days in May
Seneca, 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 (5.8 days).
Average snowfall in May
Seneca, IL
- Average snowfall in May: 0"
The month with the highest snowfall is February (4.57").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in May
Seneca, IL
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is January (11.9 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
Seneca, IL
- Average daylight in May: 14h and 30min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in May: 8h and 54min
The months with the most sunshine are June and August (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in May
Seneca, IL
- Average sunshine days in May: 10.7 days
The month with the most sunshine days is November (17.1 days).
The month with the least sunshine days is June (10.1 days).
Average UV index in May
Seneca, IL
- Average UV index in May: 5
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in May
Seneca, IL
- Average cloud cover in May: 41
The month with the most cloud cover is January (Cloud cover 59).
The month with the least cloud cover is September (Cloud cover 32).
Average visibility in May
Seneca, IL
- Average visibility in May: 6mi
The months with the highest visibility are February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, July and August (5mi).
