May weather forecastHelena, OK
May
Weather in May
May, the last month of the spring in Helena, is a warm month, with an average temperature fluctuating between 58.8°F (14.9°C) and 78.6°F (25.9°C).Temperature
Helena's May weather brings a rise in high-temperatures, moving from an agreeable 69.4°F (20.8°C) in April to a moderately hot 78.6°F (25.9°C). Helena's nighttime temperature during May is consistently averaged at a mild 58.8°F (14.9°C).Humidity
May is the most humid month, with an average relative humidity of 66%.Rainfall
The month with the most rainfall is May, when the rain falls for 13.2 days and typically aggregates up to 3.5" (89mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. May is the last month it regularly snows in Helena, Oklahoma. During 0.1 snowfall days, in May, Helena aggregates 0.04" (1mm) of snow. Throughout the year, there are 8.7 snowfall days, and 4.06" (103mm) of snow is accumulated.Daylight
In Helena, the average length of the day in May is 14h and 8min.On the first day of the month, sunrise is at 6:38 am and sunset at 8:21 pm. On the last day of May, in Helena, Oklahoma, sunrise is at 6:16 am and sunset at 8:45 pm CDT.
Sunshine
The average sunshine in May is 9.9h.UV index
In May, the average daily maximum UV index is 6. A UV Index of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for average individuals.Note: The daily high UV index of 6 in May translates into this advice:
Beware of overexposure. Fair-skinned individuals risk burning in less than 20 minutes. The Sun emits the most powerful UV radiation between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Helena, OK
- Average high temperature in May: 78.6°F
The warmest month (with the highest average high temperature) is July (95.2°F).
The month with the lowest average high temperature is January (46.4°F).
- Average low temperature in May: 58.8°F
The month with the highest average low temperature is July (75.2°F).
The coldest month (with the lowest average low temperature) is January (29.7°F).
Average pressure in May
Helena, OK
- Average pressure in May: 29.89"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).
Average wind speed in May
Helena, OK
- Average wind speed in May: 10.5mph
The windiest month (with the highest average wind speed) is April (11.8mph).
The calmest month (with the lowest average wind speed) is August (8.8mph).
Average humidity in May
Helena, OK
- Average humidity in May: 66%
The month with the highest relative humidity is May (66%).
The month with the lowest relative humidity is July (54%).
Average rainfall in May
Helena, OK
- Average rainfall in May: 3.5"
The wettest month (with the highest rainfall) is May (3.5").
The driest month (with the least rainfall) is February (0.51").
Average rainfall days in May
Helena, OK
- Average rainfall days in May: 13.2 days
The month with the highest number of rainy days is May (13.2 days).
The month with the least rainy days is December (3.6 days).
Average snowfall in May
Helena, OK
- Average snowfall in May: 0.04"
The month with the highest snowfall is February (1.46").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Helena, OK
- Average snowfall days in May: 0.1 days
The month with the highest number of snowfall days is February (2.7 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, OK
- Average daylight in May: 14h and 6min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in May: 9h and 54min
The month with the most sunshine is June (Average sunshine: 11h and 24min).
The month with the least sunshine is December (Average sunshine: 6h and 24min).
Average sunshine days in May
Helena, OK
- Average sunshine days in May: 15 days
The month with the most sunshine days is January (25.5 days).
The month with the least sunshine days is May (15 days).
Average UV index in May
Helena, OK
- Average UV index in May: 6
The months with the highest UV index are June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 2).
Average cloud cover in May
Helena, OK
- Average cloud cover in May: 30
The months with the most cloud cover are March and April (Cloud cover 33).
The month with the least cloud cover is June (Cloud cover 17).
Average visibility in May
Helena, OK
- 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).
