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
As May arrives, Helena's weather shows an increase in high-temperatures, moving from April's comfortable 62.8°F (17.1°C) to an agreeable 72.1°F (22.3°C). Helena's nights in May cool down to an average low-temperature of 55.2°F (12.9°C).Humidity
In May, the average relative humidity in Helena is 78%.Rainfall
The month with the most rainfall is May, when the rain falls for 17.1 days and typically aggregates up to 4.02" (102mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. May is the last month it regularly snows in Helena. During 0.2 snowfall days, in May, Helena aggregates 0.16" (4mm) of snow. Throughout the year, there are 25.5 snowfall days, and 10.91" (277mm) of snow is accumulated.Daylight
The average length of the day in May in Helena is 14h and 24min.On the first day of May in Helena, sunrise is at 6:17 am and sunset at 8:13 pm. On the last day of the month, sunrise is at 5:52 am and sunset at 8:40 pm CDT.
Sunshine
In May, the average sunshine is 8.6h.UV index
The average daily maximum UV index in May is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: In May, the maximum UV index of 5 transforms into these recommendations:
Make use of precautions - Suggestions to resist sunburn are communicated. Minimize direct exposure to the Sun during midday when its radiation is at its peak. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Helena in May?
What is the average humidity in May in Helena?
What is the wettest month in Helena?
How much does it rain in Helena in May?
What is the last month it snows in Helena?
How many hours of daylight does Helena have in May?
When is the sunrise / sunset in May in Helena?
How many hours of sunshine does Helena have in May?
What is the UV index intensity in May in Helena?
Average temperature in May
Helena, MO
- Average high temperature in May: 72.1°F
The warmest month (with the highest average high temperature) is July (85.5°F).
The month with the lowest average high temperature is January (34.2°F).
- Average low temperature in May: 55.2°F
The month with the highest average low temperature is July (67.6°F).
The coldest month (with the lowest average low temperature) is January (20.3°F).
Average pressure in May
Helena, MO
- Average pressure in May: 29.92"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in May
Helena, MO
- Average wind speed in May: 8.2mph
The windiest months (with the highest average wind speed) are February and March (9.9mph).
The calmest month (with the lowest average wind speed) is July (6.4mph).
Average humidity in May
Helena, MO
- Average humidity in May: 78%
The month with the highest relative humidity is June (79%).
The months with the lowest relative humidity are October and November (70%).
Average rainfall in May
Helena, MO
- Average rainfall in May: 4.02"
The wettest month (with the highest rainfall) is May (4.02").
The driest months (with the least rainfall) are January and February (0.94").
Average rainfall days in May
Helena, MO
- Average rainfall days in May: 17.1 days
The month with the highest number of rainy days is May (17.1 days).
The month with the least rainy days is January (3.8 days).
Average snowfall in May
Helena, MO
- Average snowfall in May: 0.16"
The month with the highest snowfall is January (3.43").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Helena, MO
- Average snowfall days in May: 0.2 days
The month with the highest number of snowfall days is February (7.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Helena, MO
- Average daylight in May: 14h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in May: 8h and 4min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 48min).
Average sunshine days in May
Helena, MO
- Average sunshine days in May: 11.4 days
The month with the most sunshine days is November (21.1 days).
The month with the least sunshine days is June (10.8 days).
Average UV index in May
Helena, MO
- Average UV index in May: 5
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in May
Helena, MO
- Average cloud cover in May: 40
The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 27).
Average visibility in May
Helena, MO
- Average visibility in May: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Helena, Missouri, USA
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