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
The arrival of May brings a temperature shift, with the average high-temperature escalating from a refreshing 58.6°F (14.8°C) in April to a pleasant 69.4°F (20.8°C). Throughout May, the nighttime temperature in Jefferson averages to a cool 52.2°F (11.2°C).Humidity
In May, the average relative humidity is 70%.Rainfall
The months with the most rainfall in Jefferson, South Dakota, are May and June, with an average 3.03" (77mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. May is the last month it regularly snows in Jefferson, South Dakota. During 0.2 snowfall days, in May, Jefferson aggregates 0.04" (1mm) of snow. In Jefferson, during the entire year, snow falls for 38 days and aggregates up to 13.23" (336mm) of snow.Daylight
In Jefferson, the average length of the day in May is 14h and 38min.On the first day of the month, sunrise is at 6:19 am and sunset at 8:26 pm. On the last day of May, in Jefferson, sunrise is at 5:51 am and sunset at 8:56 pm CDT.
Sunshine
The average sunshine in May is 8.8h.UV index
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 radiation for average individuals.Note: An average maximum UV index of 5 in May leads to these recommendations:
Adopt protective measures - Suggestions to resist sunburn are offered. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Remember this! The UV radiation of the Sun can be nearly doubled by the reflective properties of snow.
Frequently asked questions
What are May temperatures in Jefferson?
What is the average humidity in May in Jefferson?
What is the wettest month in Jefferson?
How many days does it rain in May in Jefferson?
What is the last month it snows in Jefferson?
What is the average length of the day in May in Jefferson?
What time are sunrise and sunset in May in Jefferson?
How many hours of sunshine does Jefferson have in May?
What is the UV index intensity in May in Jefferson?
Average temperature in May
Jefferson, SD
- Average high temperature in May: 69.4°F
The warmest month (with the highest average high temperature) is July (84°F).
The month with the lowest average high temperature is January (27°F).
- Average low temperature in May: 52.2°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (13.1°F).
Average pressure in May
Jefferson, SD
- Average pressure in May: 29.92"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).
Average wind speed in May
Jefferson, SD
- Average wind speed in May: 9.4mph
The windiest month (with the highest average wind speed) is April (11.1mph).
The calmest month (with the lowest average wind speed) is July (7.6mph).
Average humidity in May
Jefferson, SD
- Average humidity in May: 70%
The month with the highest relative humidity is January (84%).
The month with the lowest relative humidity is October (65%).
Average rainfall in May
Jefferson, SD
- Average rainfall in May: 3.03"
The wettest months (with the highest rainfall) are May and June (3.03").
The driest month (with the least rainfall) is February (0.67").
Average rainfall days in May
Jefferson, SD
- Average rainfall days in May: 16.2 days
The month with the highest number of rainy days is June (17.8 days).
The month with the least rainy days is February (3.3 days).
Average snowfall in May
Jefferson, SD
- Average snowfall in May: 0.04"
The month with the highest snowfall is January (2.95").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Jefferson, SD
- Average snowfall days in May: 0.2 days
The month with the highest number of snowfall days is January (9.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Jefferson, SD
- Average daylight in May: 14h and 4min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in May: 8h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).
Average sunshine days in May
Jefferson, SD
- Average sunshine days in May: 12.8 days
The month with the most sunshine days is November (20.9 days).
The month with the least sunshine days is June (9.7 days).
Average UV index in May
Jefferson, SD
- 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 January (UV index 1).
Average cloud cover in May
Jefferson, SD
- Average cloud cover in May: 40
The month with the most cloud cover is January (Cloud cover 52).
The month with the least cloud cover is July (Cloud cover 26).
Average visibility in May
Jefferson, SD
- 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).
Jefferson, South Dakota, USA
Weather forecast for your location
2. Allow the app to use your location
