May weather forecast
Dallas, SD

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Weather in May

The last month of the spring, May, is a comfortable month in Dallas, South Dakota, with an average temperature ranging between min 49.6°F (9.8°C) and max 67.8°F (19.9°C).

Temperature

Dallas in May experiences an increase in the average high-temperature, moving from April's refreshing 56.7°F (13.7°C) to an enjoyable 67.8°F (19.9°C). Dallas usually reports an average low-temperature of 49.6°F (9.8°C) during the month of May.

Humidity

In May, the average relative humidity in Dallas is 65%.

Rainfall

In Dallas, South Dakota, in May, during 14.3 rainfall days, 2.6" (66mm) of precipitation is typically accumulated. Throughout the year, in Dallas, South Dakota, there are 103.9 rainfall days, and 16.85" (428mm) of precipitation is accumulated.

Snowfall

January through May, October through December are months with snowfall. May is the last month it regularly snows in Dallas. During 0.2 snowfall days, in May, Dallas aggregates 0.04" (1mm) of snow. In Dallas, during the entire year, snow falls for 39.7 days and aggregates up to 14.45" (367mm) of snow.

Daylight

The average length of the day in May in Dallas is 14h and 42min.
On the first day of the month, sunrise is at 6:30 am and sunset at 8:40 pm. On the last day of May, sunrise is at 6:00 am and sunset at 9:10 pm CDT.

Sunshine

The average sunshine in May is 9.4h.

UV index

In May, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: In May, the maximum UV index of 5 suggests these recommendations:
Preventative actions are necessary - Suggestions to safeguard against sun damage are in order. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Notice! The UV radiation of the Sun can be intensified nearly twofold due to the reflective quality of snow.
Updated: Feb 14, 2024 | Published by: Weather U.S. | About Us / Weather Forecasting / Data Sources

Frequently asked questions

What is the usual temperature for Dallas in May?

The high-temperature, in May, in Dallas, is 67.8°F (19.9°C), while the low-temperature averages to 49.6°F (9.8°C).

What is the average humidity in May in Dallas?

In May, the average relative humidity in Dallas is 65%.

How much does it rain in Dallas in May?

In Dallas, South Dakota, during May, the rain falls for 14.3 days and regularly aggregates up to 2.6" (66mm) of precipitation.

What is the last month it snows in Dallas?

May is the last month it regularly snows in Dallas, South Dakota. During 0.2 snowfall days, in May, Dallas aggregates 0.04" (1mm) of snow.

What is the average length of the day in May in Dallas?

In Dallas, the average day length in May is 14h and 42min.

When are sunrise and sunset in May in Dallas?

In May, on the first day of the month, sunrise is at 6:30 am and sunset at 8:40 pm. On the last day of the month, in Dallas, sunrise is at 6:00 am and sunset at 9:10 pm CDT.

How long on average sun shines in May in Dallas?

In Dallas, the average sunshine duration in May is 9.4h.

What is the UV index intensity in May in Dallas?

In May, the average daily maximum UV index in Dallas is 5. A UV Index value of 3 to 5 symbolizes a medium health risk from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Dallas, SD

Average temperature in May - Dallas, SD
  • Average high temperature in May: 67.8°F

The warmest month (with the highest average high temperature) is July (88°F).
The month with the lowest average high temperature is January (28.8°F).

  • Average low temperature in May: 49.6°F

The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (15.6°F).

Average pressure in May
Dallas, SD

Average pressure in May - Dallas, SD
  • Average pressure in May: 29.91"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).

Average wind speed in May
Dallas, SD

Average wind speed in May - Dallas, SD
  • Average wind speed in May: 11mph

The windiest month (with the highest average wind speed) is April (11.9mph).
The calmest month (with the lowest average wind speed) is August (9.8mph).

Average humidity in May
Dallas, SD

Average humidity in May - Dallas, SD
  • Average humidity in May: 65%

The month with the highest relative humidity is January (82%).
The months with the lowest relative humidity are August and September (57%).

Average rainfall in May
Dallas, SD

Average rainfall in May - Dallas, SD
  • Average rainfall in May: 2.6"

The wettest month (with the highest rainfall) is June (2.8").
The driest month (with the least rainfall) is January (0.47").

Average rainfall days in May
Dallas, SD

Average rainfall days in May - Dallas, SD
  • Average rainfall days in May: 14.3 days

The month with the highest number of rainy days is June (15.3 days).
The months with the least rainy days are January and February (2.7 days).

Average snowfall in May
Dallas, SD

Average snowfall in May - Dallas, SD
  • Average snowfall in May: 0.04"

The month with the highest snowfall is December (3.19").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in May
Dallas, SD

Average snowfall days in May - Dallas, 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
Dallas, SD

Average daylight in May / Average sunshine in May - Dallas, 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 2min

The month with the most sunshine is July (Average sunshine: 11h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 54min).

Average sunshine days in May
Dallas, SD

Average sunshine days in May - Dallas, SD
  • Average sunshine days in May: 14.5 days

The month with the most sunshine days is November (20.8 days).
The month with the least sunshine days is June (11.2 days).

Average UV index in May
Dallas, SD

Average UV index in May - Dallas, SD
  • Average UV index in May: 5

The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).

Average cloud cover in May
Dallas, SD

Average cloud cover in May - Dallas, SD
  • Average cloud cover in May: 36

The month with the most cloud cover is January (Cloud cover 47).
The months with the least cloud cover are July and August (Cloud cover 20).

Average visibility in May
Dallas, SD

Average visibility in May - Dallas, 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).

Dallas, South Dakota, USA

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