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
May
Weather in May
Temperature
The commencement of May sees a shift in the average high-temperature, moving from a mild 14.8°C in April to a pleasant 20.8°C. The nighttime temperature, during May, averages of 11.7°C.Humidity
In May, the average relative humidity is 75%.Rainfall
In Griffen, during May, the rain falls for 16.5 days and regularly aggregates up to 82mm of precipitation. In Griffen, during the entire year, the rain falls for 123.3 days and collects up to 533mm of precipitation.Snowfall
January through May, October through December are months with snowfall. May is the last month it regularly snows. During 0.3 snowfall days, in May, Griffen aggregates 8mm of snow. Throughout the year, there are 39.9 snowfall days, and 277mm of snow is accumulated.Daylight
The average length of the day in May is 14h and 36min.On the first day of the month, sunrise is at 6:09 am and sunset at 8:14 pm. On the last day of May, sunrise is at 5:41 am and sunset at 8:44 pm CDT.
Sunshine
The average sunshine in May is 8.6h.UV index
In Griffen, the average daily maximum UV index in May is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for the average person.Note: In May, the UV index of 5 transforms into the following advice:
Heed the precautions - Suggestions to avoid sunburn are made. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage. Mind you! Snow reflection can increase the intensity of the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in May?
What is the average humidity in May in Griffen?
How many days does it rain in May?
What is the last month it snows?
What is the average length of the day in May?
When is the sunrise / sunset in May?
How many hours of sunshine does Griffen have in May?
What is the UV index reading in May?
Average temperature in May
Griffen, IA
- Average high temperature in May: 20.8°C
The warmest month (with the highest average high temperature) is July (27.4°C).
The month with the lowest average high temperature is January (-3.1°C).
- Average low temperature in May: 11.7°C
The month with the highest average low temperature is July (18°C).
The coldest month (with the lowest average low temperature) is January (-10.5°C).
Average pressure in May
Griffen, IA
- Average pressure in May: 1013.6mbar
The month with the highest atmospheric pressure is January (1021.2mbar).
The month with the lowest atmospheric pressure is June (1012mbar).
Average wind speed in May
Griffen, IA
- Average wind speed in May: 14.6km/h
The windiest month (with the highest average wind speed) is April (17.2km/h).
The calmest month (with the lowest average wind speed) is July (11.4km/h).
Average humidity in May
Griffen, IA
- Average humidity in May: 75%
The month with the highest relative humidity is January (84%).
The month with the lowest relative humidity is October (69%).
Average rainfall in May
Griffen, IA
- Average rainfall in May: 82mm
The wettest month (with the highest rainfall) is June (85mm).
The driest month (with the least rainfall) is January (17mm).
Average rainfall days in May
Griffen, IA
- Average rainfall days in May: 16.5 days
The month with the highest number of rainy days is June (17.4 days).
The month with the least rainy days is February (3.2 days).
Average snowfall in May
Griffen, IA
- Average snowfall in May: 8mm
The month with the highest snowfall is February (78mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in May
Griffen, IA
- Average snowfall days in May: 0.3 days
The month with the highest number of snowfall days is January (10.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Griffen, 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 4min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days in May
Griffen, IA
- Average sunshine days in May: 12 days
The month with the most sunshine days is October (19.5 days).
The month with the least sunshine days is June (10.5 days).
Average UV index in May
Griffen, 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
Griffen, IA
- Average cloud cover in May: 42
The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is September (Cloud cover 30).
Average visibility in May
Griffen, IA
- Average visibility in May: 9km
The months with the highest visibility are February, March, April, May, June, September, October, November and December (9km).
The months with the lowest visibility are January, July and August (8km).