May weather forecastRiverside, MT
May
Weather in May
May, the last month of the spring in Riverside, is a frosty month, with an average temperature varying between 28.9°F (-1.7°C) and 49.8°F (9.9°C).Temperature
With the arrival of May, the average high-temperature transitions from a cold 37.2°F (2.9°C) in April to a frosty 49.8°F (9.9°C). Riverside's nighttime temperature in May falls to an average of 28.9°F (-1.7°C).Humidity
In Riverside, the average relative humidity in May is 76%.Rainfall
The month with the most rainfall is May, when the rain falls for 17.4 days and typically aggregates up to 2.8" (71mm) of precipitation.Snowfall
Months with snowfall are January through July, September through December. In May, it is snowing for 10.3 days. Throughout May, 8.23" (209mm) of snow is accumulated. Throughout the year, there are 159.3 snowfall days, and 120.47" (3060mm) of snow is accumulated.Daylight
In Riverside, the average length of the day in May is 14h and 50min.On the first day of May, sunrise is at 6:12 am and sunset at 8:29 pm. On the last day of the month, sunrise is at 5:42 am and sunset at 9:02 pm MDT.
Sunshine
The average sunshine in May is 9.6h.UV index
The average daily maximum UV index in May is 3. A UV Index value of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In May, a regular UV index of 3 translates into these guidelines:
Proceed with care. Light skin individuals may be exposed to burns in fewer than 30 minutes. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses. Alert! The snow's reflection can amplify the UV radiation of the Sun nearly twice.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Riverside, MT
- Average high temperature in May: 49.8°F
The warmest month (with the highest average high temperature) is July (72.9°F).
The month with the lowest average high temperature is December (20.1°F).
- Average low temperature in May: 28.9°F
The month with the highest average low temperature is August (43.7°F).
The coldest month (with the lowest average low temperature) is December (4.8°F).
Average pressure in May
Riverside, MT
- Average pressure in May: 29.94"Hg
The month with the highest atmospheric pressure is January (30.24"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in May
Riverside, MT
- Average wind speed in May: 6mph
The windiest month (with the highest average wind speed) is June (6.8mph).
The calmest month (with the lowest average wind speed) is August (5.8mph).
Average humidity in May
Riverside, MT
- Average humidity in May: 76%
The month with the highest relative humidity is February (95%).
The month with the lowest relative humidity is August (50%).
Average rainfall in May
Riverside, MT
- Average rainfall in May: 2.8"
The wettest month (with the highest rainfall) is May (2.8").
The driest month (with the least rainfall) is July (0.91").
Average rainfall days in May
Riverside, MT
- Average rainfall days in May: 17.4 days
The month with the highest number of rainy days is May (17.4 days).
The month with the least rainy days is January (2.2 days).
Average snowfall in May
Riverside, MT
- Average snowfall in May: 8.23"
The month with the highest snowfall is February (17.83").
The month with the least snowfall is August (0").
Average snowfall days in May
Riverside, MT
- Average snowfall days in May: 10.3 days
The month with the highest number of snowfall days is March (24.4 days).
The months with the least snowfall days are July and August (0.2 days).
Average daylight in May /
Average sunshine in May
Riverside, MT
- Average daylight in May: 14h and 48min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in May: 9h and 36min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The months with the least sunshine are January, February and December (Average sunshine: 3h and 18min).
Average sunshine days in May
Riverside, MT
- Average sunshine days in May: 5.5 days
The months with the most sunshine days are July and September (14.7 days).
The month with the least sunshine days is February (5.3 days).
Average UV index in May
Riverside, MT
- Average UV index in May: 3
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 1).
Average cloud cover in May
Riverside, MT
- Average cloud cover in May: 39
The month with the most cloud cover is February (Cloud cover 76).
The month with the least cloud cover is July (Cloud cover 16).
Average visibility in May
Riverside, MT
- Average visibility in May: 5mi
The months with the highest visibility are June, July, August and September (6mi).
The months with the lowest visibility are January, February, March and December (3mi).
