May weather forecastMarshalltown, IA
May
Weather in May
May in Marshalltown brings a considerably warmer and damper atmosphere than April. The increase in precipitation peaks at 2.48" (63mm), contributing to higher levels of humidity in the city. As the city steps into late spring, the weather remains gentle, escorting residents into the early days of summer. Generous daylight hours make for longer brighter days, making it a delightful time for outdoor exploration. Despite the rain, May guarantees a pleasant environment for residents and visitors alike.Temperature
Marshalltown sees a rise in temperature during May, with average high-temperatures transitioning from a mild 57.7°F (14.3°C) in April to a pleasant 68.7°F (20.4°C). An average low-temperature of 52.2°F (11.2°C) is noted during the nights in May.Humidity
In May, the average relative humidity in Marshalltown is 77%.Rainfall
In Marshalltown, during May, the rain falls for 15.2 days and regularly aggregates up to 2.48" (63mm) of precipitation. Throughout the year, in Marshalltown, there are 118.2 rainfall days, and 16.18" (411mm) of precipitation is accumulated.Snowfall
Months with snowfall in Marshalltown are January through May, October through December. May is the last month it regularly snows in Marshalltown, Iowa. During 0.3 snowfall days, in May, Marshalltown aggregates 0.04" (1mm) of snow. In Marshalltown, during the entire year, snow falls for 34.6 days and aggregates up to 6.97" (177mm) of snow.Daylight
In May, the average length of the day is 14h and 35min.On the first day of the month, sunrise is at 6:06 am and sunset at 8:11 pm. On the last day of May, in Marshalltown, Iowa, sunrise is at 5:38 am and sunset at 8:40 pm CDT.
Sunshine
In May, the average sunshine is 8.6h.UV index
In May, the average daily maximum UV index in Marshalltown is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for the ordinary person.Note: In May, the maximum UV index of 5 suggests this advice:
Be vigilant - A duty to shield skin and eyes from injury exists. Avoiding the Sun during its peak radiation time around midday is a healthy practice. Always opt for UVA and UVB-resistant sunglasses on radiant days. Notice this! Nearly double the intensity of the Sun's UV radiation can be caused by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Marshalltown, IA
- Average high temperature in May: 68.7°F
The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (25.7°F).
- Average low temperature in May: 52.2°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 (12.7°F).
Average pressure in May
Marshalltown, IA
- Average pressure in May: 29.93"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in May
Marshalltown, IA
- Average wind speed in May: 9.3mph
The windiest month (with the highest average wind speed) is April (10.8mph).
The calmest months (with the lowest average wind speed) are July and August (7.1mph).
Average humidity in May
Marshalltown, IA
- Average humidity in May: 77%
The month with the highest relative humidity is January (86%).
The month with the lowest relative humidity is October (72%).
Average rainfall in May
Marshalltown, IA
- Average rainfall in May: 2.48"
The wettest month (with the highest rainfall) is June (2.56").
The driest month (with the least rainfall) is January (0.43").
Average rainfall days in May
Marshalltown, IA
- Average rainfall days in May: 15.2 days
The month with the highest number of rainy days is June (15.7 days).
The month with the least rainy days is February (2.8 days).
Average snowfall in May
Marshalltown, IA
- Average snowfall in May: 0.04"
The month with the highest snowfall is January (1.93").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Marshalltown, IA
- Average snowfall days in May: 0.3 days
The month with the highest number of snowfall days is January (9.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Marshalltown, IA
- Average daylight in May: 14h and 36min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in May: 8h and 36min
The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in May
Marshalltown, IA
- Average sunshine days in May: 12.9 days
The month with the most sunshine days is December (20.6 days).
The month with the least sunshine days is June (12.2 days).
Average UV index in May
Marshalltown, IA
- Average UV index in May: 5
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, October, November and December (UV index 2).
Average cloud cover in May
Marshalltown, IA
- Average cloud cover in May: 42
The month with the most cloud cover is January (Cloud cover 57).
The month with the least cloud cover is September (Cloud cover 30).
Average visibility in May
Marshalltown, IA
- 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).
