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 Helena transitions into May, the average high-temperature is observed to rise from an agreeable 69.4°F (20.8°C) in April to a warm 78.6°F (25.9°C). During May nights, Helena witnesses a consistent average temperature of 58.8°F (14.9°C).Humidity
The most humid month is May, with an average relative humidity of 66%.Rainfall
May is the month with the most rainfall. Rain falls for 13.2 days and accumulates 3.5" (89mm) of precipitation.Snowfall
January through May, October through December are months with snowfall in Helena. May is the last month it regularly snows in Helena. During 0.1 snowfall days, in May, Helena aggregates 0.04" (1mm) of snow. In Helena, during the entire year, snow falls for 8.7 days and aggregates up to 4.06" (103mm) of snow.Daylight
In May, the average length of the day in Helena 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, sunrise is at 6:16 am and sunset at 8:45 pm CDT.
Sunshine
In May, the average sunshine in Helena is 9.9h.UV index
The average daily maximum UV index in May in Helena is 6. A UV Index reading of 6 to 7 represents a high health hazard from unsafe exposure to UV radiation for average individuals.Note: A maximum high daily UV index of 6 during May translates into the following directions:
Avoid overexposure. Fair-skinned individuals can burn in under 20 minutes. Avoid direct Sun exposure and seek shade from 10 a.m. to 4 p.m., the period of highest UV radiation. Remember, however, that not all shade structures offer full protection. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Mind you! Snow reflection can increase the intensity of the Sun's UV radiation nearly twofold.
Frequently asked questions
What is the usual temperature for Helena in May?
What is the most humid month in Helena?
What is the average humidity in May in Helena?
What is the rainiest 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?
When 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, 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 1min
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 5min
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).
Helena, Oklahoma, USA
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