May weather forecastAffton, MO
May
Weather in May
May is the onset of warmer weather in Affton, Missouri. The month stands out due to its higher rainfall, reaching an apex at an average 3.94" (100mm). This month sees an escalation in temperatures and humidity, marking the transition into the summer season. As gardens metaphorically burst into life with color, the increase in temperature and rain brings about a different kind of beauty altogether. It's a month filled with the scent of fresh earth, budding flowers, and the refreshing after-rain ambience.Temperature
An increase in the average high-temperature marks May, moving from April's enjoyable 65.7°F (18.7°C) to a warm 75.4°F (24.1°C). An average low-temperature of 57.7°F (14.3°C) marks the nights throughout May.Humidity
With an average relative humidity of 78%, May is the most humid month.Rainfall
The month with the most rainfall is May, when the rain falls for 16.8 days and typically aggregates up to 3.94" (100mm) of precipitation.Snowfall
April through October are months without snowfall.Daylight
The average length of the day in May is 14h and 17min.On the first day of the month, sunrise is at 6:03 am and sunset at 7:53 pm. On the last day of May, sunrise is at 5:38 am and sunset at 8:19 pm CDT.
Sunshine
In May, the average sunshine is 9.5h.UV index
May through August, with an average maximum UV index of 6, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high health hazard from exposure to the Sun's UV radiation for the average person.Note: The maximum UV index of 6 during May translates into these guidelines:
Shield from overexposure. Defense against sun-related harm is required. The Sun emits the most powerful UV radiation between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Affton, MO
- Average high temperature in May: 75.4°F
The warmest month (with the highest average high temperature) is July (86.9°F).
The month with the lowest average high temperature is January (37.9°F).
- Average low temperature in May: 57.7°F
The month with the highest average low temperature is July (69.3°F).
The coldest month (with the lowest average low temperature) is January (25°F).
Average pressure in May
Affton, MO
- Average pressure in May: 29.96"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
Affton, MO
- Average wind speed in May: 7.1mph
The windiest month (with the highest average wind speed) is January (9.1mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).
Average humidity in May
Affton, 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
Affton, MO
- Average rainfall in May: 3.94"
The wettest month (with the highest rainfall) is May (3.94").
The driest months (with the least rainfall) are February and November (1.77").
Average rainfall days in May
Affton, MO
- Average rainfall days in May: 16.8 days
The month with the highest number of rainy days is July (16.9 days).
The months with the least rainy days are January and February (6.8 days).
Average snowfall in May
Affton, MO
- Average snowfall in May: 0"
The month with the highest snowfall is February (2.6").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in May
Affton, MO
- Average snowfall days in May: 0 days
The months with the highest number of snowfall days are January and February (4.8 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
Affton, 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 June (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).
Average sunshine days in May
Affton, MO
- Average sunshine days in May: 12.1 days
The month with the most sunshine days is January (20.9 days).
The month with the least sunshine days is June (11.6 days).
Average UV index in May
Affton, MO
- Average UV index in May: 6
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover in May
Affton, MO
- Average cloud cover in May: 37
The month with the most cloud cover is January (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in May
Affton, 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).
