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 comes with an increase, with the average high-temperature moving from a mild 60.1°F (15.6°C) in April to a pleasant 70.2°F (21.2°C). Mercer records an average nighttime low of 53.1°F (11.7°C) in May.Humidity
In Mercer, the average relative humidity in May is 78%.Rainfall
In Mercer, during May, the rain falls for 16.5 days and regularly aggregates up to 3.19" (81mm) of precipitation. Throughout the year, there are 115.1 rainfall days, and 19.21" (488mm) of precipitation is accumulated.Snowfall
May through September are months without snowfall.Daylight
In Mercer, the average length of the day in May is 14h and 29min.On the first day of May, sunrise is at 6:15 am and sunset at 8:15 pm. On the last day of the month, sunrise is at 5:48 am and sunset at 8:43 pm CDT.
Sunshine
The average sunshine in May is 8.5h.UV index
In May, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the average person.Note: In May, a daily maximum UV index of 5 leads to the following instructions:
Be mindful. Individuals with a lighter skin tone may suffer burns in less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are May temperatures in Mercer?
What is the average humidity in May?
How much does it rain in Mercer in May?
When it does not snow?
Does it snow in May?
How many hours of daylight does Mercer have in May?
What time are sunrise and sunset in May?
How many hours of sunshine does Mercer have in May?
How high is the UV index in May?
Average temperature in May
Mercer, IA
- Average high temperature in May: 70.2°F
The warmest month (with the highest average high temperature) is July (83.3°F).
The month with the lowest average high temperature is January (29.3°F).
- Average low temperature in May: 53.1°F
The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (16°F).
Average pressure in May
Mercer, IA
- Average pressure in May: 29.93"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in May
Mercer, IA
- Average wind speed in May: 8.8mph
The windiest months (with the highest average wind speed) are March and April (10.5mph).
The calmest month (with the lowest average wind speed) is July (7mph).
Average humidity in May
Mercer, IA
- Average humidity in May: 78%
The months with the highest relative humidity are January and June (81%).
The month with the lowest relative humidity is October (70%).
Average rainfall in May
Mercer, IA
- Average rainfall in May: 3.19"
The wettest month (with the highest rainfall) is June (3.74").
The driest month (with the least rainfall) is February (0.51").
Average rainfall days in May
Mercer, IA
- Average rainfall days in May: 16.5 days
The month with the highest number of rainy days is May (16.5 days).
The month with the least rainy days is February (3 days).
Average snowfall in May
Mercer, IA
- Average snowfall in May: 0"
The month with the highest snowfall is January (2.28").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in May
Mercer, IA
- Average snowfall days in May: 0.1 days
The month with the highest number of snowfall days is January (8.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Mercer, IA
- Average daylight in May: 14h and 3min
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 3min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).
Average sunshine days in May
Mercer, IA
- Average sunshine days in May: 12 days
The month with the most sunshine days is November (22.5 days).
The month with the least sunshine days is May (12 days).
Average UV index in May
Mercer, IA
- Average UV index in May: 5
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in May
Mercer, IA
- Average cloud cover in May: 42
The month with the most cloud cover is January (Cloud cover 52).
The months with the least cloud cover are July and September (Cloud cover 29).
Average visibility in May
Mercer, IA
- 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).
Mercer, Iowa, USA
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