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 marks a rise in the average high-temperature, moving from April's fresh 50.2°F (10.1°C) to a refreshing 64.2°F (17.9°C). Westby anticipates an average minimum temperature of 46.4°F (8°C) in the month of May.Humidity
In Westby, the average relative humidity in May is 55%.Rainfall
In May, in Westby, the rain falls for 12.5 days. Throughout May, 1.57" (40mm) of precipitation is accumulated. Throughout the year, in Westby, there are 93.3 rainfall days, and 12.01" (305mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. May is the last month it regularly snows in Westby, Montana. During 0.8 snowfall days, in May, Westby aggregates 0.51" (13mm) of snow. In Westby, during the entire year, snow falls for 66.5 days and aggregates up to 19.02" (483mm) of snow.Daylight
In May, the average length of the day in Westby is 15h and 19min.On the first day of the month, sunrise is at 6:34 am and sunset at 9:12 pm. On the last day of May, in Westby, sunrise is at 5:57 am and sunset at 9:50 pm CDT.
Sunshine
In May, the average sunshine is 10h.UV index
In May, the average daily maximum UV index in Westby is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for average individuals.Note: The maximum daily UV index, 5 in May, converts into the following recommendations:
Make use of precautions - Suggestions to resist sunburn are communicated. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Mark this! Snow reflection can nearly double the UV radiation intensity from the Sun.
Frequently asked questions
What is the usual temperature for Westby in May?
What is the average humidity in May in Westby?
How much does it rain in Westby in May?
What is the last month it snows in Westby?
What is the average length of the day in May in Westby?
What time are sunrise and sunset in May in Westby?
How long on average sun shines in May in Westby?
What is the UV index reading in May in Westby?
Average temperature in May
Westby, MT
- Average high temperature in May: 64.2°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is February (19.8°F).
- Average low temperature in May: 46.4°F
The month with the highest average low temperature is July (61°F).
The coldest month (with the lowest average low temperature) is February (6.3°F).
Average pressure in May
Westby, MT
- Average pressure in May: 29.92"Hg
The month with the highest atmospheric pressure is February (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.83"Hg).
Average wind speed in May
Westby, MT
- Average wind speed in May: 10.6mph
The windiest month (with the highest average wind speed) is April (11.1mph).
The calmest month (with the lowest average wind speed) is February (9.2mph).
Average humidity in May
Westby, MT
- Average humidity in May: 55%
The months with the highest relative humidity are January and February (88%).
The month with the lowest relative humidity is August (46%).
Average rainfall in May
Westby, MT
- Average rainfall in May: 1.57"
The wettest month (with the highest rainfall) is June (2.17").
The driest month (with the least rainfall) is February (0.47").
Average rainfall days in May
Westby, MT
- Average rainfall days in May: 12.5 days
The month with the highest number of rainy days is June (13.9 days).
The month with the least rainy days is February (2.6 days).
Average snowfall in May
Westby, MT
- Average snowfall in May: 0.51"
The month with the highest snowfall is November (3.74").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Westby, MT
- Average snowfall days in May: 0.8 days
The month with the highest number of snowfall days is February (13.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Westby, 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 July (Average sunshine: 11h and 42min).
The month with the least sunshine is February (Average sunshine: 3h and 54min).
Average sunshine days in May
Westby, MT
- Average sunshine days in May: 16.6 days
The month with the most sunshine days is August (20.1 days).
The months with the least sunshine days are February and June (13.8 days).
Average UV index in May
Westby, MT
- Average UV index in May: 5
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is February (UV index 1).
Average cloud cover in May
Westby, MT
- Average cloud cover in May: 34
The month with the most cloud cover is February (Cloud cover 60).
The months with the least cloud cover are July and August (Cloud cover 19).
Average visibility in May
Westby, MT
- Average visibility in May: 6mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March and December (5mi).
Westby, Montana, USA
Weather forecast for your location
2. Allow the app to use your location
