May weather forecastChesterfield, MO
May
Weather in May
May is the gateway to the much-awaited arrival of summer in Chesterfield. The city looks more green and fecund with the increased humidity from 75% in April to 78% in May. The inhabitants readily exchange their spring clothing for lighter summer wear. The warming temperature starts to invigorate Chesterfield with summer’s signature vibrancy and energetics. The pleasing weather conditions create a canvas for families to plan their Memorial Day celebrations and commence the summer season.Temperature
As May sets, the average high-temperature shows an increase, moving up from an enjoyable 65.8°F (18.8°C) in April to a moderately hot 75°F (23.9°C). Chesterfield records an average temperature drop to a refreshing 57°F (13.9°C) in May.Humidity
The most humid month is May, with an average relative humidity of 78%.Rainfall
May is the month with the most rainfall. Rain falls for 16.3 days and accumulates 3.19" (81mm) of precipitation.Snowfall
In Chesterfield, snow does not fall in April through October.Daylight
The average length of the day in May is 14h and 18min.On the first day of May, sunrise is at 6:03 am and sunset at 7:54 pm. On the last day of the month, sunrise is at 5:39 am and sunset at 8:20 pm CDT.
Sunshine
In May, the average sunshine is 9.5h.UV index
In May, the average daily maximum UV index in Chesterfield is 6. A UV Index estimate of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation for the average person.Note: The maximum daily UV index of 6 in May converts into the following recommendations:
Adhere to precautions and respect sun safety doctrines. Avoiding sunburn is vital. Between 10 a.m. and 4 p.m., the Sun's UV radiation is at its peak. Limit your exposure to direct sunlight during these hours. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Chesterfield, MO
- Average high temperature in May: 75°F
The warmest month (with the highest average high temperature) is July (87.4°F).
The month with the lowest average high temperature is January (37.8°F).
- Average low temperature in May: 57°F
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (24.1°F).
Average pressure in May
Chesterfield, MO
- Average pressure in May: 29.95"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in May
Chesterfield, MO
- Average wind speed in May: 7mph
The windiest month (with the highest average wind speed) is January (8.9mph).
The calmest month (with the lowest average wind speed) is July (5.4mph).
Average humidity in May
Chesterfield, MO
- Average humidity in May: 78%
The month with the highest relative humidity is May (78%).
The month with the lowest relative humidity is October (71%).
Average rainfall in May
Chesterfield, MO
- Average rainfall in May: 3.19"
The wettest month (with the highest rainfall) is May (3.19").
The driest month (with the least rainfall) is February (1.3").
Average rainfall days in May
Chesterfield, MO
- Average rainfall days in May: 16.3 days
The month with the highest number of rainy days is May (16.3 days).
The month with the least rainy days is January (6.8 days).
Average snowfall in May
Chesterfield, MO
- Average snowfall in May: 0"
The month with the highest snowfall is February (1.69").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in May
Chesterfield, MO
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is January (6.7 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
Chesterfield, MO
- Average daylight in May: 14h and 18min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in May: 9h and 30min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).
Average sunshine days in May
Chesterfield, MO
- Average sunshine days in May: 12.8 days
The months with the most sunshine days are January and December (20.2 days).
The month with the least sunshine days is June (12 days).
Average UV index in May
Chesterfield, MO
- Average UV index in May: 6
The month with the highest UV index is June (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in May
Chesterfield, MO
- Average cloud cover in May: 36
The month with the most cloud cover is January (Cloud cover 49).
The months with the least cloud cover are July and August (Cloud cover 27).
Average visibility in May
Chesterfield, MO
- 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).
