May weather forecastOttumwa, IA
May
Weather in May
As the heart of Spring, May brings an increase in temperatures, lush green scenes, and chirping birds back to Ottumwa. The warmest days reach up to 70°F (21.1°C), a far cry from the freezing winter only a few months ago. Rainfall increases, promoting further growth and enhancing the city's natural beauty. The abundant sunshine and mild temperatures make May an ideal time for outdoor activities ranging from picnics to nature walks. Thus, May serves as the perfect transition into the sunny vibrance of summer.Temperature
May in Ottumwa witnesses an increase in the average high-temperature, moving from a moderate 60.1°F (15.6°C) in April to a pleasant 70°F (21.1°C). Ottumwa, during May nights, observes an average temperature of 53.2°F (11.8°C).Humidity
In Ottumwa, the average relative humidity in May is 80%.Rainfall
The month with the most rainfall is May, when the rain falls for 17.3 days and typically aggregates up to 4.02" (102mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. May is the last month it regularly snows. During 0.1 snowfall days, in May, Ottumwa aggregates 0.04" (1mm) of snow. In Ottumwa, during the entire year, snow falls for 33.5 days and aggregates up to 14.17" (360mm) of snow.Daylight
In May, the average length of the day is 14h and 30min.On the first day of May, sunrise is at 6:06 am and sunset at 8:06 pm. On the last day of the month, sunrise is at 5:39 am and sunset at 8:35 pm CDT.
Sunshine
In May, the average sunshine in Ottumwa, Iowa, is 8.5h.UV index
In Ottumwa, Iowa, the average daily maximum UV index in May is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for average individuals.Note: The UV index of 5 during May translates into the following guidance:
Exercise caution. The susceptibility of light skin individuals to burns is less than 30 minutes. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades. Remember! The Sun's UV radiation can be magnified almost twofold by the reflection of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Ottumwa, IA
- Average high temperature in May: 70°F
The warmest month (with the highest average high temperature) is July (82.6°F).
The month with the lowest average high temperature is January (29.3°F).
- Average low temperature in May: 53.2°F
The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is January (16.2°F).
Average pressure in May
Ottumwa, 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
Ottumwa, IA
- Average wind speed in May: 8.8mph
The windiest month (with the highest average wind speed) is January (10.8mph).
The calmest month (with the lowest average wind speed) is August (6.9mph).
Average humidity in May
Ottumwa, IA
- Average humidity in May: 80%
The month with the highest relative humidity is June (83%).
The month with the lowest relative humidity is October (72%).
Average rainfall in May
Ottumwa, IA
- Average rainfall in May: 4.02"
The wettest month (with the highest rainfall) is May (4.02").
The driest month (with the least rainfall) is January (1.06").
Average rainfall days in May
Ottumwa, IA
- Average rainfall days in May: 17.3 days
The month with the highest number of rainy days is May (17.3 days).
The month with the least rainy days is January (5.2 days).
Average snowfall in May
Ottumwa, IA
- Average snowfall in May: 0.04"
The month with the highest snowfall is February (4.17").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Ottumwa, IA
- Average snowfall days in May: 0.1 days
The month with the highest number of snowfall days is January (10.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Ottumwa, IA
- 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 30min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).
Average sunshine days in May
Ottumwa, IA
- Average sunshine days in May: 11.6 days
The month with the most sunshine days is December (18.9 days).
The month with the least sunshine days is May (11.6 days).
Average UV index in May
Ottumwa, IA
- 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
Ottumwa, IA
- Average cloud cover in May: 42
The month with the most cloud cover is January (Cloud cover 54).
The months with the least cloud cover are August and September (Cloud cover 29).
Average visibility in May
Ottumwa, 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).
