May weather forecast
Eureka, MT

Weather in May

May, the last month of the spring, in Eureka, is a moderate month, with average temperature ranging between min 34.5°F (1.4°C) and max 59.7°F (15.4°C).

Temperature

In May, the average high-temperature rises, from a frosty 46.4°F (8°C) in April, to a moderate 59.7°F (15.4°C). In May, in Eureka, the average low-temperature is 34.5°F (1.4°C).

Humidity

In Eureka, the average relative humidity in May is 69%.

Rainfall

In Eureka, during May, the rain falls for 15.2 days and regularly aggregates up to 1.57" (40mm) of precipitation. Throughout the year, in Eureka, there are 136.3 rainfall days, and 15.35" (390mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, September through December. May is the last month it regularly snows in Eureka. During 1.2 snowfall days, Eureka aggregates 0.31" (8mm) of snow. Throughout the year, in Eureka, there are 110.7 snowfall days, and 46.81" (1189mm) of snow is accumulated.

Daylight

In Eureka, the average length of the day in May is 15.3h.

Sunshine

The average sunshine is 10h.

UV index

In Eureka, the average daily maximum UV index in May is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from the exposure to the Sun's UV radiation for the ordinary person.
Note: In May, the average maximum UV index of 4 translate into the following recommendations:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the average humidity in May in Eureka?

In Eureka, the average relative humidity in May is 69%.

How much does it rain in Eureka in May?

In Eureka, Montana, in May, it is raining for 15.2 days, with typically 1.57" (40mm) of accumulated precipitation.

What is the last month it snows in Eureka?

May is the last month it regularly snows in Eureka. During 1.2 snowfall days, in May, Eureka aggregates 0.31" (8mm) of snow.

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

In May, the average length of the day is 15.3h.

How long on average sun shines in May in Eureka?

In Eureka, Montana, the average sunshine in May is 10h.

How high is the UV index in May in Eureka?

In May, the average daily maximum UV index in Eureka is 4. A UV Index value of 3 to 5 symbolizes a medium hazard to health from unsafe exposure to the Sun's UV rays.

Average temperature in May
Eureka, MT

Average temperature in May - Eureka, MT
  • Average high temperature in May: 59.7°F

The warmest month (with the highest average high temperature) is July (77.4°F).
The month with the lowest average high temperature is December (25.5°F).

  • Average low temperature in May: 34.5°F

The month with the highest average low temperature is August (45.1°F).
The coldest month (with the lowest average low temperature) is December (13.1°F).

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Average pressure in May
Eureka, MT

Average pressure in May - Eureka, MT
  • Average pressure in May: 29.96"

The month with the highest atmospheric pressure is January (30.17").
The month with the lowest atmospheric pressure is June (29.91").

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Average wind speed in May
Eureka, MT

Average wind speed in May - Eureka, MT
  • Average wind speed in May: 4.2mph

The windiest month (with the highest average wind speed) is June (4.4mph).
The calmest month (with the lowest average wind speed) is December (3.4mph).

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Average humidity in May
Eureka, MT

Average humidity in May - Eureka, MT
  • Average humidity in May: 69%

The month with the highest relative humidity is January (95%).
The month with the lowest relative humidity is August (55%).

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Average rainfall in May
Eureka, MT

Average rainfall in May - Eureka, MT
  • Average rainfall in May: 1.57"

The wettest month (with the highest rainfall) is March (1.85").
The driest month (with the least rainfall) is August (0.39").

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Average rainfall days in May
Eureka, MT

Average rainfall days in May - Eureka, MT
  • Average rainfall days in May: 15.2 days

The month with the highest number of rainy days is April (17 days).
The month with the least rainy days is August (6.1 days).

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Average snowfall in May
Eureka, MT

Average snowfall in May - Eureka, MT
  • Average snowfall in May: 0.31"

The month with the highest snowfall is February (10").
Months with the least snowfall are June, July and August (0").

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Average snowfall days in May
Eureka, MT

Average snowfall days in May - Eureka, MT
  • Average snowfall days in May: 1.2 days

The month with the highest number of snowfall days is December (22.1 days).
Months with the least snowfall days are June, July and August (0 days).

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Average daylight in May /
Average sunshine in May
Eureka, MT

Average daylight in May / Average sunshine in May - Eureka, MT
  • Average daylight in May: 15.3h

The month with the longest days is June (Average daylight: 16.1h).
The month with the shortest days is December (Average daylight: 8.3h).

  • Average sunshine in May: 10h

The month with the most sunshine is August (Average sunshine: 11.7h).
The month with the least sunshine is January (Average sunshine: 3.1h).

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Average sunshine days in May
Eureka, MT

Average sunshine days in May - Eureka, MT
  • Average sunshine days in May: 12.6 days

The month with the most sunshine days is August (21.6 days).
The month with the least sunshine days is March (6.3 days).

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Average UV index in May
Eureka, MT

Average UV index in May - Eureka, MT
  • Average UV index in May: 4

The month with the highest UV index is July (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 1).

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Average cloud cover in May
Eureka, MT

Average cloud cover in May - Eureka, MT
  • Average cloud cover in May: 37

The month with the most cloud cover is January (Cloud cover 70).
The month with the least cloud cover is August (Cloud cover 15).

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Average visibility in May
Eureka, MT

Average visibility in May - Eureka, MT
  • Average visibility in May: 6mi

Months with the highest visibility are May, June, July, August and September (6mi).
The month with the lowest visibility is January (2mi).

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