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
Helena's May weather brings a rise in high-temperatures, moving from a moderate 55.9°F (13.3°C) in April to a pleasant 68°F (20°C). Throughout May, the nighttime temperature averages to a cool 52.3°F (11.3°C).Humidity
The average relative humidity in May in Helena is 77%.Rainfall
The wettest months in Helena are May and June, with an average 3.5" (89mm) of rainfall.Snowfall
January through May, October through December are months with snowfall in Helena. May is the last month it regularly snows. During 0.1 snowfall days, in May, Helena aggregates 0.04" (1mm) of snow. In Helena, during the entire year, snow falls for 45.1 days and aggregates up to 14.02" (356mm) of snow.Daylight
In Helena, the average length of the day in May is 14h and 31min.On the first day of May in Helena, sunrise is at 6:29 am and sunset at 8:31 pm. On the last day of the month, sunrise is at 6:02 am and sunset at 8:59 pm EDT.
Sunshine
In May, the average sunshine is 8.9h.UV index
The average daily maximum UV index in May is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for average individuals.Note: The maximum daily UV index, 5 in May, converts into the following recommendations:
Adopt protective measures - It is advised to guard against sun damage. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. Remember! The Sun's UV radiation can be magnified almost twofold by the reflection of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are May temperatures in Helena?
What is the average humidity in May in Helena?
What is the wettest month in Helena?
How many days does it rain in May in Helena?
What is the last month it snows in Helena?
What is the average length of the day in May in Helena?
What time are sunrise and sunset in May in Helena?
How long on average sun shines in May in Helena?
How high is the UV index in May in Helena?
Average temperature in May
Helena, OH
- Average high temperature in May: 68°F
The warmest month (with the highest average high temperature) is July (80.1°F).
The month with the lowest average high temperature is January (30.7°F).
- Average low temperature in May: 52.3°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (19.9°F).
Average pressure in May
Helena, OH
- Average pressure in May: 29.98"Hg
The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in May
Helena, OH
- Average wind speed in May: 8.3mph
The windiest month (with the highest average wind speed) is January (10.9mph).
The calmest month (with the lowest average wind speed) is July (6.3mph).
Average humidity in May
Helena, OH
- Average humidity in May: 77%
The months with the highest relative humidity are January and February (84%).
The month with the lowest relative humidity is October (74%).
Average rainfall in May
Helena, OH
- Average rainfall in May: 3.5"
The wettest months (with the highest rainfall) are May and June (3.5").
The driest month (with the least rainfall) is February (1.65").
Average rainfall days in May
Helena, OH
- Average rainfall days in May: 18.7 days
The month with the highest number of rainy days is May (18.7 days).
The month with the least rainy days is February (7.2 days).
Average snowfall in May
Helena, OH
- Average snowfall in May: 0.04"
The month with the highest snowfall is February (4.13").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Helena, OH
- Average snowfall days in May: 0.1 days
The month with the highest number of snowfall days is January (12.8 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, OH
- Average daylight in May: 14h and 3min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in May: 8h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).
Average sunshine days in May
Helena, OH
- Average sunshine days in May: 10.8 days
The month with the most sunshine days is November (15.5 days).
The month with the least sunshine days is February (10.3 days).
Average UV index in May
Helena, OH
- Average UV index in May: 5
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in May
Helena, OH
- Average cloud cover in May: 40
The month with the most cloud cover is January (Cloud cover 65).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in May
Helena, OH
- Average visibility in May: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
Helena, Ohio, USA
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