May weather forecastHelena, KY
May
Weather in May
The last month of the spring, May, is a warm month in Helena, Kentucky, with temperature in the range of an average high of 74.8°F (23.8°C) and an average low of 55.2°F (12.9°C).Temperature
May brings an increase in the average high-temperature, progressing from an enjoyable 64.9°F (18.3°C) in April to a warm 74.8°F (23.8°C). In Helena, in May, the average low-temperature is a fresh 55.2°F (12.9°C).Humidity
In Helena, Kentucky, the average relative humidity in May is 79%.Rainfall
In May, the rain falls for 15.2 days. Throughout May, 1.81" (46mm) of precipitation is accumulated. In Helena, during the entire year, the rain falls for 143.3 days and collects up to 17.36" (441mm) of precipitation.Snowfall
In Helena, snow does not fall in May through September.Daylight
The average length of the day in May is 14h and 17min.On the first day of the month, sunrise is at 6:36 am and sunset at 8:27 pm. On the last day of May, sunrise is at 6:12 am and sunset at 8:53 pm EDT.
Sunshine
In May, the average sunshine in Helena is 9.1h.UV index
The months with the highest UV index are May through August, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health risk from unsafe exposure to UV radiation for ordinary individuals.Note: The maximum UV index of 6 during May leads to these instructions:
Continue precautions and advocate sun safety advice. Deterrence of sunburn is indispensable. Avoid direct Sun exposure and stay in the shade between 10 a.m. and 4 p.m., a time when UV radiation is most intense, noting that not all shade structures offer full protection. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Remember this! The UV radiation of the Sun can be nearly doubled by the reflective properties of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Helena, KY
- Average high temperature in May: 74.8°F
The warmest month (with the highest average high temperature) is July (85.3°F).
The month with the lowest average high temperature is January (37.9°F).
- Average low temperature in May: 55.2°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (25.2°F).
Average pressure in May
Helena, KY
- Average pressure in May: 29.99"Hg
The months with the highest atmospheric pressure are January and November (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.96"Hg).
Average wind speed in May
Helena, KY
- Average wind speed in May: 6.6mph
The windiest month (with the highest average wind speed) is January (8.5mph).
The calmest month (with the lowest average wind speed) is August (5mph).
Average humidity in May
Helena, KY
- Average humidity in May: 79%
The months with the highest relative humidity are February and December (81%).
The month with the lowest relative humidity is August (75%).
Average rainfall in May
Helena, KY
- Average rainfall in May: 1.81"
The wettest month (with the highest rainfall) is July (1.93").
The driest months (with the least rainfall) are January, September and October (1.06").
Average rainfall days in May
Helena, KY
- Average rainfall days in May: 15.2 days
The month with the highest number of rainy days is July (15.8 days).
The month with the least rainy days is November (8.3 days).
Average snowfall in May
Helena, KY
- Average snowfall in May: 0"
The month with the highest snowfall is February (1.46").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in May
Helena, KY
- Average snowfall days in May: 0.1 days
The month with the highest number of snowfall days is January (8.5 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, KY
- Average daylight in May: 14h and 18min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in May: 9h and 6min
The month with the most sunshine is August (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in May
Helena, KY
- Average sunshine days in May: 12.8 days
The month with the most sunshine days is November (19 days).
The month with the least sunshine days is February (11.4 days).
Average UV index in May
Helena, KY
- Average UV index in May: 6
The months with the highest UV index are May, 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, KY
- Average cloud cover in May: 42
The month with the most cloud cover is January (Cloud cover 59).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in May
Helena, KY
- Average visibility in May: 5mi
The months with the highest visibility are March, April, June, August, October, November and December (6mi).
The months with the lowest visibility are January, February, May, July and September (5mi).
