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 onset in East Helena is marked by a temperature increase, moving from a frosty 47.8°F (8.8°C) in April to a moderate 59.4°F (15.2°C). East Helena's nights in May are distinguished by a pronounced temperature shift from the day, with an average low of 36.9°F (2.7°C).Humidity
In East Helena, the average relative humidity in May is 62%.Rainfall
In May, the rain falls for 15.8 days. Throughout May, 1.5" (38mm) of precipitation is accumulated. In East Helena, during the entire year, the rain falls for 123.7 days and collects up to 12.4" (315mm) of precipitation.Snowfall
Months with snowfall in East Helena are January through May, September through December. May is the last month it regularly snows in East Helena. During 1.3 snowfall days, in May, East Helena aggregates 0.67" (17mm) of snow. In East Helena, during the entire year, snow falls for 80.4 days and aggregates up to 34.88" (886mm) of snow.Daylight
In May, the average length of the day in East Helena is 15h and 2min.On the first day of May in East Helena, Montana, sunrise is at 6:11 am and sunset at 8:37 pm. On the last day of the month, sunrise is at 5:38 am and sunset at 9:12 pm MDT.
Sunshine
In East Helena, the average sunshine in May is 10.3h.UV index
In East Helena, the average daily maximum UV index in May is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the average person.Note: The maximum daily UV index of 4 during May translates into the following directions:
Heed the precautions - It is counselled to guard against solar damage. The Sun's radiation is especially intense around midday; try to stay in shade during this period. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck. Note this! The Sun's UV radiation can nearly be doubled by the reflection off snow.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in East Helena in May?
What is the average humidity in May in East Helena?
How much does it rain in East Helena in May?
What is the last month it snows in East Helena?
What is the average length of the day in May in East Helena?
When are sunrise and sunset in May in East Helena?
How many hours of sunshine does East Helena have in May?
What is the UV index intensity in May in East Helena?
Average temperature in May
East Helena, MT
- Average high temperature in May: 59.4°F
The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is December (27.7°F).
- Average low temperature in May: 36.9°F
The month with the highest average low temperature is July (50.4°F).
The coldest month (with the lowest average low temperature) is December (14.2°F).
Average pressure in May
East Helena, MT
- Average pressure in May: 29.95"Hg
The month with the highest atmospheric pressure is January (30.18"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in May
East Helena, MT
- Average wind speed in May: 5.8mph
The windiest month (with the highest average wind speed) is November (7.1mph).
The calmest month (with the lowest average wind speed) is August (5mph).
Average humidity in May
East Helena, MT
- Average humidity in May: 62%
The month with the highest relative humidity is January (85%).
The months with the lowest relative humidity are July and August (46%).
Average rainfall in May
East Helena, MT
- Average rainfall in May: 1.5"
The wettest month (with the highest rainfall) is June (2.01").
The driest months (with the least rainfall) are January and December (0.63").
Average rainfall days in May
East Helena, MT
- Average rainfall days in May: 15.8 days
The month with the highest number of rainy days is May (15.8 days).
The month with the least rainy days is November (7 days).
Average snowfall in May
East Helena, MT
- Average snowfall in May: 0.67"
The month with the highest snowfall is February (6.18").
The months with the least snowfall are June, July and August (0").
Average snowfall days in May
East Helena, MT
- Average snowfall days in May: 1.3 days
The month with the highest number of snowfall days is February (16.2 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in May /
Average sunshine in May
East Helena, MT
- Average daylight in May: 15h and 0min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in May: 10h and 2min
The month with the most sunshine is July (Average sunshine: 11h and 42min).
The month with the least sunshine is January (Average sunshine: 5h and 36min).
Average sunshine days in May
East Helena, MT
- Average sunshine days in May: 12.2 days
The month with the most sunshine days is July (20.5 days).
The month with the least sunshine days is April (9.8 days).
Average UV index in May
East Helena, MT
- Average UV index in May: 4
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
East Helena, MT
- Average cloud cover in May: 33
The month with the most cloud cover is February (Cloud cover 47).
The months with the least cloud cover are July and August (Cloud cover 15).
Average visibility in May
East Helena, MT
- Average visibility in May: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (5mi).
East Helena, Montana, USA
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