May weather forecastDelaware, IA
May
Weather in May
May, the last month of the spring in Delaware, is a comfortable month, with an average temperature fluctuating between 66.9°F (19.4°C) and 50.5°F (10.3°C).Temperature
May sees a rise in the average high-temperature, climbing from a mild 55.8°F (13.2°C) in April to a comfortable 66.9°F (19.4°C). Nighttime temperature lowers to an average of 50.5°F (10.3°C) in May.Humidity
In May, the average relative humidity is 80%.Rainfall
May is the month with the most rainfall. Rain falls for 14.9 days and accumulates 2.13" (54mm) of precipitation.Snowfall
May through September are months without snowfall.Daylight
In Delaware, the average length of the day in May is 14h and 38min.On the first day of May, sunrise is at 5:59 am and sunset at 8:05 pm. On the last day of the month, sunrise is at 5:30 am and sunset at 8:35 pm CDT.
Sunshine
In May, the average sunshine in Delaware is 8.1h.UV index
May through August, with an average maximum UV index of 5, are months with the highest UV index. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for the average person.Note: A maximum high UV index of 5 in May translates into the following recommendations:
Exercise care. People with light skin might get burns in fewer than 30 minutes. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Delaware, IA
- Average high temperature in May: 66.9°F
The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (24.3°F).
- Average low temperature in May: 50.5°F
The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (11.7°F).
Average pressure in May
Delaware, IA
- Average pressure in May: 29.94"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in May
Delaware, IA
- Average wind speed in May: 9.3mph
The windiest month (with the highest average wind speed) is April (10.9mph).
The calmest months (with the lowest average wind speed) are July and August (7.1mph).
Average humidity in May
Delaware, IA
- Average humidity in May: 80%
The month with the highest relative humidity is January (88%).
The months with the lowest relative humidity are April and October (75%).
Average rainfall in May
Delaware, IA
- Average rainfall in May: 2.13"
The wettest month (with the highest rainfall) is May (2.13").
The driest month (with the least rainfall) is December (0.47").
Average rainfall days in May
Delaware, IA
- Average rainfall days in May: 14.9 days
The month with the highest number of rainy days is June (15.4 days).
The month with the least rainy days is February (2.6 days).
Average snowfall in May
Delaware, IA
- Average snowfall in May: 0"
The month with the highest snowfall is January (2.13").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in May
Delaware, IA
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is January (10.8 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
Delaware, 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 6min).
- Average sunshine in May: 8h and 6min
The months with the most sunshine are July and August (Average sunshine: 9h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).
Average sunshine days in May
Delaware, IA
- Average sunshine days in May: 12.9 days
The month with the most sunshine days is December (19.7 days).
The month with the least sunshine days is June (11.7 days).
Average UV index in May
Delaware, IA
- Average UV index in May: 5
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January, November and December (UV index 1).
Average cloud cover in May
Delaware, IA
- Average cloud cover in May: 46
The month with the most cloud cover is January (Cloud cover 63).
The months with the least cloud cover are August and September (Cloud cover 33).
Average visibility in May
Delaware, IA
- Average visibility in May: 6mi
The months with the highest visibility are February, March, April, May, June, August, September, October, November and December (6mi).
The months with the lowest visibility are January and July (5mi).
