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
Preston's transition into May brings a rise in the average high-temperature, moving from a mild 56.7°F (13.7°C) in April to a pleasant 68.5°F (20.3°C). Throughout the month of May, Preston witnesses an average low-temperature of 51.6°F (10.9°C).Humidity
The average relative humidity in May in Preston is 79%.Rainfall
The month with the most rainfall is May, when the rain falls for 18.7 days and typically aggregates up to 4.53" (115mm) of precipitation.Snowfall
May through September are months without snowfall in Preston.Daylight
In Preston, the average length of the day in May is 14h and 35min.On the first day of May, sunrise is at 5:56 am and sunset at 8:01 pm. On the last day of the month, sunrise is at 5:28 am and sunset at 8:30 pm CDT.
Sunshine
In Preston, the average sunshine in May is 8.4h.UV index
In May, the average daily maximum UV index in Preston is 5. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for average individuals.Note: A maximum high UV index of 5 in May translates into the following recommendations:
Be careful. Light complexion individuals might get burns in fewer than 30 minutes. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Preston in May?
What is the average humidity in May in Preston?
What is the wettest month in Preston?
How much does it rain in Preston in May?
When it does not snow in Preston?
Does it snow in Preston in May?
How many hours of daylight does Preston have in May?
What time are sunrise and sunset in May in Preston?
How long on average sun shines in May in Preston?
How high is the UV index in May in Preston?
Average temperature in May
Preston, IA
- Average high temperature in May: 68.5°F
The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is January (25.9°F).
- Average low temperature in May: 51.6°F
The month with the highest average low temperature is July (63.7°F).
The coldest month (with the lowest average low temperature) is January (13.3°F).
Average pressure in May
Preston, IA
- Average pressure in May: 29.95"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
Preston, IA
- Average wind speed in May: 8.9mph
The windiest month (with the highest average wind speed) is April (10.5mph).
The calmest months (with the lowest average wind speed) are July and August (6.8mph).
Average humidity in May
Preston, IA
- Average humidity in May: 79%
The month with the highest relative humidity is January (86%).
The month with the lowest relative humidity is October (74%).
Average rainfall in May
Preston, IA
- Average rainfall in May: 4.53"
The wettest month (with the highest rainfall) is May (4.53").
The driest month (with the least rainfall) is January (1.34").
Average rainfall days in May
Preston, IA
- Average rainfall days in May: 18.7 days
The month with the highest number of rainy days is May (18.7 days).
The month with the least rainy days is February (5.3 days).
Average snowfall in May
Preston, IA
- Average snowfall in May: 0"
The month with the highest snowfall is January (5.2").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in May
Preston, IA
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is January (11 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
Preston, IA
- Average daylight in May: 14h and 4min
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 2min
The month with the most sunshine is July (Average sunshine: 9h and 54min).
The months with the least sunshine are January and February (Average sunshine: 3h and 54min).
Average sunshine days in May
Preston, IA
- Average sunshine days in May: 10.2 days
The month with the most sunshine days is November (18.6 days).
The month with the least sunshine days is May (10.2 days).
Average UV index in May
Preston, IA
- Average UV index in May: 5
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in May
Preston, IA
- Average cloud cover in May: 44
The month with the most cloud cover is January (Cloud cover 60).
The months with the least cloud cover are August and September (Cloud cover 31).
Average visibility in May
Preston, 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).
Preston, Iowa, USA
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