May weather forecast
Thermopolis, WY

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Weather in May

May ushers in significant changes in the weather of Thermopolis with a considerable jump in temperatures and the official start of the warm season. It is the month with the highest amount of rainfall, at 1.93" (49mm) throughout the year. This increased precipitation fuels the blossoming vegetation, bringing liveliness and charm to the surrounding landscapes. The promise of extended daylight hours and less cloud cover brings forth better opportunities for outdoor activities. Filled with the chirping of migrating birds and fragrance of blooming flowers, May carries a definite sense of joy and vibrancy.

Temperature

As Thermopolis, Wyoming, transitions into May, a rise in the average high-temperature is observed, moving from a cool 52.9°F (11.6°C) in April to a comfortable 63.5°F (17.5°C). Thermopolis in May anticipates an average nighttime temperature of 43.3°F (6.3°C).

Humidity

In Thermopolis, the average relative humidity in May is 51%.

Rainfall

The month with the most rainfall is May, when the rain falls for 17 days and typically aggregates up to 1.93" (49mm) of precipitation.

Snowfall

Months with snowfall in Thermopolis are January through May, September through December. May is the last month it regularly snows. During 0.7 snowfall days, in May, Thermopolis aggregates 0.31" (8mm) of snow. In Thermopolis, during the entire year, snow falls for 51.2 days and aggregates up to 21.3" (541mm) of snow.

Daylight

The average length of the day in May is 14h and 44min.
On the first day of the month, sunrise is at 6:03 am and sunset at 8:15 pm. On the last day of May, sunrise is at 5:34 am and sunset at 8:47 pm MDT.

Sunshine

In Thermopolis, the average sunshine in May is 10.7h.

UV index

In Thermopolis, the average daily maximum UV index in May is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.
Note: A maximum high UV index of 5 in May translates into the following recommendations:
Heed the precautions - It is counselled to guard against solar damage. The solar radiation around mid-day is intense; avoid the Sun and stay safe. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. Bear in mind! The Sun's UV radiation can nearly double in intensity due to the reflective quality of snow.
Updated: Feb 14, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are May temperatures in Thermopolis?

In May, in Thermopolis, the average high-temperature is 63.5°F (17.5°C), and the average low-temperature is 43.3°F (6.3°C).

What is the average humidity in May in Thermopolis?

In May, the average relative humidity is 51%.

What is the rainiest month in Thermopolis?

May is the month with the most rainfall in Thermopolis. Rain falls for 17 days and accumulates 1.93" (49mm) of precipitation.

How much does it rain in Thermopolis in May?

In Thermopolis, Wyoming, during May, the rain falls for 17 days and regularly aggregates up to 1.93" (49mm) of precipitation.

What is the last month it snows in Thermopolis?

May is the last month it regularly snows in Thermopolis, Wyoming. During 0.7 snowfall days, in May, Thermopolis aggregates 0.31" (8mm) of snow.

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

The average day length in May in Thermopolis is 14h and 44min.

When are sunrise and sunset in May in Thermopolis?

On the first day of May, sunrise is at 6:03 am and sunset at 8:15 pm. On the last day of the month, sunrise is at 5:34 am and sunset at 8:47 pm MDT.

How long on average sun shines in May in Thermopolis?

In Thermopolis, the average sunshine duration in May is 10.7h.

How high is the UV index in May in Thermopolis?

In Thermopolis, Wyoming, the average daily maximum UV index in May is 5. A UV Index of 3 to 5 symbolizes a moderate health threat 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
Thermopolis, WY

Average temperature in May - Thermopolis, WY
  • Average high temperature in May: 63.5°F

The warmest month (with the highest average high temperature) is July (84.9°F).
The month with the lowest average high temperature is December (28.2°F).

  • Average low temperature in May: 43.3°F

The month with the highest average low temperature is July (61.3°F).
The coldest month (with the lowest average low temperature) is January (12.6°F).

Average pressure in May
Thermopolis, WY

Average pressure in May - Thermopolis, WY
  • Average pressure in May: 29.91"Hg

The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).

Average wind speed in May
Thermopolis, WY

Average wind speed in May - Thermopolis, WY
  • Average wind speed in May: 6.8mph

The windiest month (with the highest average wind speed) is April (7.1mph).
The calmest month (with the lowest average wind speed) is January (5mph).

Average humidity in May
Thermopolis, WY

Average humidity in May - Thermopolis, WY
  • Average humidity in May: 51%

The month with the highest relative humidity is January (81%).
The months with the lowest relative humidity are July and August (35%).

Average rainfall in May
Thermopolis, WY

Average rainfall in May - Thermopolis, WY
  • Average rainfall in May: 1.93"

The wettest month (with the highest rainfall) is May (1.93").
The driest month (with the least rainfall) is January (0.43").

Average rainfall days in May
Thermopolis, WY

Average rainfall days in May - Thermopolis, WY
  • Average rainfall days in May: 17 days

The month with the highest number of rainy days is May (17 days).
The months with the least rainy days are January and December (4.3 days).

Average snowfall in May
Thermopolis, WY

Average snowfall in May - Thermopolis, WY
  • Average snowfall in May: 0.31"

The month with the highest snowfall is February (4.57").
The months with the least snowfall are June, July and August (0").

Average snowfall days in May
Thermopolis, WY

Average snowfall days in May - Thermopolis, WY
  • Average snowfall days in May: 0.7 days

The month with the highest number of snowfall days is February (11.1 days).
The months with the least snowfall days are June, July and August (0 days).

Average daylight in May /
Average sunshine in May
Thermopolis, WY

Average daylight in May / Average sunshine in May - Thermopolis, WY
  • Average daylight in May: 14h and 4min

The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).

  • Average sunshine in May: 10h and 4min

The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 6h and 12min).

Average sunshine days in May
Thermopolis, WY

Average sunshine days in May - Thermopolis, WY
  • Average sunshine days in May: 10.1 days

The month with the most sunshine days is January (20.2 days).
The month with the least sunshine days is May (10.1 days).

Average UV index in May
Thermopolis, WY

Average UV index in May - Thermopolis, WY
  • Average UV index in May: 5

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, April, November and December (UV index 2).

Average cloud cover in May
Thermopolis, WY

Average cloud cover in May - Thermopolis, WY
  • Average cloud cover in May: 28

The month with the most cloud cover is February (Cloud cover 35).
The months with the least cloud cover are July and August (Cloud cover 14).

Average visibility in May
Thermopolis, WY

Average visibility in May - Thermopolis, WY
  • Average visibility in May: 6mi

The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).

Thermopolis, Wyoming, USA

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