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
With the onset of May, the average high-temperature slightly shifts from April's refreshing 59.9°F (15.5°C) to a pleasant 69.4°F (20.8°C). Knoxville experiences a mean low-temperature of 52.9°F (11.6°C) during May.Humidity
The average relative humidity in May is 79%.Rainfall
May is the month with the most rainfall. Rain falls for 15.3 days and accumulates 2.24" (57mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. May is the last month it regularly snows. During 0.2 snowfall days, in May, Knoxville aggregates 0.2" (5mm) of snow. In Knoxville, Iowa, during the entire year, snow falls for 30.4 days and aggregates up to 6.5" (165mm) of snow.Daylight
In May, the average length of the day is 14h and 31min.On the first day of May, sunrise is at 6:08 am and sunset at 8:10 pm. On the last day of the month, sunrise is at 5:41 am and sunset at 8:38 pm CDT.
Sunshine
In Knoxville, the average sunshine in May is 8.7h.UV index
The average daily maximum UV index in May is 5. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the ordinary person.Note: In May, the average maximum UV index of 5 translates into the following recommendations:
Make use of precautions - Suggestions to resist sunburn are communicated. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. Always opt for UVA and UVB-resistant sunglasses on radiant days. Note this! The Sun's UV radiation can nearly be doubled by the reflection off snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average May temperature in Knoxville?
What is the average humidity in May in Knoxville?
What is the wettest month in Knoxville?
How much does it rain in Knoxville in May?
What is the last month it snows in Knoxville?
How many hours of daylight does Knoxville have in May?
When are sunrise and sunset in May in Knoxville?
How many hours of sunshine does Knoxville have in May?
What is the UV index reading in May in Knoxville?
Average temperature in May
Knoxville, IA
- Average high temperature in May: 69.4°F
The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is January (28.6°F).
- Average low temperature in May: 52.9°F
The month with the highest average low temperature is July (65.5°F).
The coldest month (with the lowest average low temperature) is January (15.1°F).
Average pressure in May
Knoxville, 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 (29.89"Hg).
Average wind speed in May
Knoxville, IA
- Average wind speed in May: 8.8mph
The windiest month (with the highest average wind speed) is January (10.5mph).
The calmest month (with the lowest average wind speed) is August (6.8mph).
Average humidity in May
Knoxville, IA
- Average humidity in May: 79%
The month with the highest relative humidity is January (83%).
The month with the lowest relative humidity is October (71%).
Average rainfall in May
Knoxville, IA
- Average rainfall in May: 2.24"
The wettest month (with the highest rainfall) is May (2.24").
The driest months (with the least rainfall) are February and December (0.47").
Average rainfall days in May
Knoxville, IA
- Average rainfall days in May: 15.3 days
The month with the highest number of rainy days is May (15.3 days).
The month with the least rainy days is February (3.9 days).
Average snowfall in May
Knoxville, IA
- Average snowfall in May: 0.2"
The month with the highest snowfall is January (2.24").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Knoxville, IA
- Average snowfall days in May: 0.2 days
The month with the highest number of snowfall days is January (8.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Knoxville, 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 4min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).
Average sunshine days in May
Knoxville, IA
- Average sunshine days in May: 12 days
The months with the most sunshine days are November and December (20.5 days).
The month with the least sunshine days is June (11.6 days).
Average UV index in May
Knoxville, 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
Knoxville, IA
- Average cloud cover in May: 41
The month with the most cloud cover is January (Cloud cover 53).
The months with the least cloud cover are July, August and September (Cloud cover 29).
Average visibility in May
Knoxville, 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).
Knoxville, Iowa, USA
Weather forecast for your location
2. Allow the app to use your location