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
May's arrival sees a rise in the average high-temperature, jumping from April's mild 55.9°F (13.3°C) to a comfortable 66.2°F (19°C). May nights experience a consistent temperature drop to a frosty 46.9°F (8.3°C).Humidity
In May, the average relative humidity is 62%.Rainfall
The month with the most rainfall is May, when the rain falls for 13.1 days and typically aggregates up to 2.13" (54mm) of precipitation.Snowfall
January through May, September through December are months with snowfall in Allen. May is the last month it regularly snows. During 1.2 snowfall days, in May, Allen aggregates 2.17" (55mm) of snow. Throughout the year, in Allen, there are 47.4 snowfall days, and 22.72" (577mm) of snow is accumulated.Daylight
In Allen, the average length of the day in May is 14h and 42min.On the first day of the month, sunrise is at 5:39 am and sunset at 7:49 pm. On the last day of May, sunrise is at 5:10 am and sunset at 8:20 pm MDT.
Sunshine
In Allen, the average sunshine in May is 9.6h.UV index
In May, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for the ordinary person.Note: An average UV index of 5 in May transforms into this advice:
Make use of precautions - Suggestions to resist sunburn are communicated. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes. Remember! The Sun's UV radiation can be magnified almost twofold by the reflection of snow.
Frequently asked questions
What are May temperatures in Allen?
What is the average humidity in May in Allen?
What is the rainiest month in Allen?
How many days does it rain in May in Allen?
What is the last month it snows in Allen?
What is the average length of the day in May in Allen?
When is the sunrise / sunset in May in Allen?
How many hours of sunshine does Allen have in May?
What is the UV index reading in May in Allen?
Average temperature in May
Allen, SD
- Average high temperature in May: 66.2°F
The warmest month (with the highest average high temperature) is July (87.6°F).
The month with the lowest average high temperature is December (32.4°F).
- Average low temperature in May: 46.9°F
The month with the highest average low temperature is July (65.5°F).
The coldest month (with the lowest average low temperature) is January (18.1°F).
Average pressure in May
Allen, SD
- Average pressure in May: 29.91"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in May
Allen, SD
- Average wind speed in May: 11.4mph
The windiest month (with the highest average wind speed) is April (12.2mph).
The calmest month (with the lowest average wind speed) is August (10.2mph).
Average humidity in May
Allen, SD
- Average humidity in May: 62%
The month with the highest relative humidity is January (80%).
The month with the lowest relative humidity is August (48%).
Average rainfall in May
Allen, SD
- Average rainfall in May: 2.13"
The wettest month (with the highest rainfall) is May (2.13").
The driest month (with the least rainfall) is January (0.55").
Average rainfall days in May
Allen, SD
- Average rainfall days in May: 13.1 days
The month with the highest number of rainy days is May (13.1 days).
The months with the least rainy days are February and December (2.5 days).
Average snowfall in May
Allen, SD
- Average snowfall in May: 2.17"
The month with the highest snowfall is February (4.02").
The months with the least snowfall are June, July and August (0").
Average snowfall days in May
Allen, SD
- Average snowfall days in May: 1.2 days
The month with the highest number of snowfall days is February (11.5 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in May /
Average sunshine in May
Allen, 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 0min).
- Average sunshine in May: 9h and 4min
The month with the most sunshine is August (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 12min).
Average sunshine days in May
Allen, SD
- Average sunshine days in May: 15.5 days
The month with the most sunshine days is September (22.8 days).
The month with the least sunshine days is April (13.2 days).
Average UV index in May
Allen, SD
- Average UV index in May: 5
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in May
Allen, SD
- Average cloud cover in May: 36
The month with the most cloud cover is February (Cloud cover 44).
The month with the least cloud cover is August (Cloud cover 16).
Average visibility in May
Allen, 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).
Allen, South Dakota, USA
Weather forecast for your location
2. Allow the app to use your location
