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 brings a temperature shift, moving from a chilly 46.4°F (8°C) in April to a moderate 59.7°F (15.4°C). Contrasting the daytime warmth, Eureka's May nights cool down to an average of 34.5°F (1.4°C).Humidity
In May, the average relative humidity 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, 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, in May, 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 15h and 19min.On the first day of May, sunrise is at 6:17 am and sunset at 8:56 pm. On the last day of the month, sunrise is at 5:41 am and sunset at 9:35 pm MDT.
Sunshine
In May, the average sunshine is 10h.UV index
In Eureka, Montana, the average daily maximum UV index in May is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for the ordinary person.Note: A maximum high UV index of 4 in May translates into the following recommendations:
Take necessary precautions - Protection from skin and eye injury is mandatory. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Be cautious! The UV radiation from the Sun can be magnified almost twofold by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in May in Eureka?
What is the average humidity in May in Eureka?
How many days does it rain in May in Eureka?
What is the last month it snows in Eureka?
What is the average length of the day in May in Eureka?
What time are sunrise and sunset in May in Eureka?
How many hours of sunshine does Eureka have in May?
What is the UV index reading in May in Eureka?
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).
Average pressure in May
Eureka, MT
- Average pressure in May: 29.96"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
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).
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%).
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").
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).
Average snowfall in May
Eureka, MT
- Average snowfall in May: 0.31"
The month with the highest snowfall is February (10").
The months with the least snowfall are June, July and August (0").
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).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in May /
Average sunshine in May
Eureka, MT
- Average daylight in May: 15h and 2min
The month with the longest days is June (Average daylight: 16h and 6min).
The month with the shortest days is December (Average daylight: 8h and 18min).
- Average sunshine in May: 10h and 0min
The month with the most sunshine is August (Average sunshine: 11h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 6min).
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).
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).
The months with the lowest UV index are January, February, November and December (UV index 1).
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).
Average visibility in May
Eureka, MT
- Average visibility in May: 6mi
The months with the highest visibility are May, June, July, August and September (6mi).
The month with the lowest visibility is January (2mi).
Eureka, Montana, USA
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