May weather forecastRalston, IA
May
Weather in May
May, the last month of the spring in Ralston, is a pleasant month, with temperature in the range of an average low of 52.9°F (11.6°C) and an average high of 69.1°F (20.6°C).Temperature
In Ralston, stepping into May brings a temperature increase, moving up from April's mild 58.5°F (14.7°C) to an agreeable 69.1°F (20.6°C). Ralston's May nights cool down to an average low-temperature of 52.9°F (11.6°C).Humidity
In Ralston, the average relative humidity in May is 73%.Rainfall
The month with the most rainfall is May, when the rain falls for 17.3 days and typically aggregates up to 4.29" (109mm) of precipitation.Snowfall
January through May, October through December are months with snowfall in Ralston. May is the last month it regularly snows. During 0.3 snowfall days, in May, Ralston aggregates 0.24" (6mm) of snow. Throughout the year, there are 44.8 snowfall days, and 19.8" (503mm) of snow is accumulated.Daylight
The average length of the day in May in Ralston is 14h and 35min.On the first day of May, sunrise is at 6:13 am and sunset at 8:17 pm. On the last day of the month, sunrise is at 5:45 am and sunset at 8:47 pm CDT.
Sunshine
The average sunshine in May is 8.6h.UV index
The average daily maximum UV index in May is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for ordinary individuals.Note: An average UV index of 5 in May transforms into this advice:
Guard yourself - Avoiding sunburn is suggested. The Sun's radiation is especially intense around midday; try to stay in shade during this period. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Mark this! Snow reflection can nearly double the UV radiation intensity from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Ralston, IA
- Average high temperature in May: 69.1°F
The warmest month (with the highest average high temperature) is July (81.5°F).
The month with the lowest average high temperature is January (26.2°F).
- Average low temperature in May: 52.9°F
The month with the highest average low temperature is July (64.4°F).
The coldest month (with the lowest average low temperature) is January (13.6°F).
Average pressure in May
Ralston, 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 (29.88"Hg).
Average wind speed in May
Ralston, IA
- Average wind speed in May: 9.3mph
The windiest month (with the highest average wind speed) is January (11.1mph).
The calmest month (with the lowest average wind speed) is July (7.2mph).
Average humidity in May
Ralston, IA
- Average humidity in May: 73%
The month with the highest relative humidity is January (84%).
The months with the lowest relative humidity are April and October (69%).
Average rainfall in May
Ralston, IA
- Average rainfall in May: 4.29"
The wettest month (with the highest rainfall) is May (4.29").
The driest month (with the least rainfall) is January (0.94").
Average rainfall days in May
Ralston, IA
- Average rainfall days in May: 17.3 days
The month with the highest number of rainy days is June (17.9 days).
The month with the least rainy days is February (4.3 days).
Average snowfall in May
Ralston, IA
- Average snowfall in May: 0.24"
The month with the highest snowfall is February (5.12").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Ralston, IA
- Average snowfall days in May: 0.3 days
The month with the highest number of snowfall days is January (11.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Ralston, IA
- Average daylight in May: 14h and 36min
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 36min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).
Average sunshine days in May
Ralston, IA
- Average sunshine days in May: 11.7 days
The month with the most sunshine days is November (18.9 days).
The month with the least sunshine days is June (10 days).
Average UV index in May
Ralston, IA
- Average UV index in May: 5
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is February (UV index 1).
Average cloud cover in May
Ralston, IA
- Average cloud cover in May: 41
The month with the most cloud cover is January (Cloud cover 55).
The month with the least cloud cover is July (Cloud cover 28).
Average visibility in May
Ralston, IA
- Average visibility in May: 6mi
The months with the highest visibility are February, March, April, May, June, July, September, October, November and December (6mi).
The months with the lowest visibility are January and August (5mi).
