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
May indicates a change in the average high-temperature, moving up from a fresh 54.7°F (12.6°C) in April to a comfortable 66.6°F (19.2°C). Throughout May, the temperature in Harpers Ferry tends to fall to a consistent average low of 48.6°F (9.2°C).Humidity
The average relative humidity in May is 81%.Rainfall
In Harpers Ferry, during May, the rain falls for 18.1 days and regularly aggregates up to 3.19" (81mm) of precipitation. Throughout the year, in Harpers Ferry, there are 124.7 rainfall days, and 22.56" (573mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. May is the last month it regularly snows in Harpers Ferry. During 0.1 snowfall days, in May, Harpers Ferry aggregates 0.04" (1mm) of snow. Throughout the year, in Harpers Ferry, Iowa, there are 44.5 snowfall days, and 15.47" (393mm) of snow is accumulated.Daylight
In Harpers Ferry, the average length of the day in May is 14h and 42min.On the first day of May, sunrise is at 5:56 am and sunset at 8:06 pm. On the last day of the month, sunrise is at 5:27 am and sunset at 8:37 pm CDT.
Sunshine
In May, the average sunshine is 8.1h.UV index
The average daily maximum UV index in May in Harpers Ferry is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for the average person.Note: In May, a daily maximum UV index of 5 leads to the following instructions:
Exercise care. People with light skin might get burns in fewer than 30 minutes. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Heed this! Snow reflection can almost augment the UV radiation of the sun by double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in May in Harpers Ferry?
What is the average humidity in May in Harpers Ferry?
How much does it rain in Harpers Ferry in May?
What is the last month it snows in Harpers Ferry?
What is the average length of the day in May in Harpers Ferry?
When are sunrise and sunset in May in Harpers Ferry?
How many hours of sunshine does Harpers Ferry have in May?
What is the UV index reading in May in Harpers Ferry?
Average temperature in May
Harpers Ferry, IA
- Average high temperature in May: 66.6°F
The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (23.2°F).
- Average low temperature in May: 48.6°F
The month with the highest average low temperature is July (61.9°F).
The coldest month (with the lowest average low temperature) is January (10.6°F).
Average pressure in May
Harpers Ferry, IA
- Average pressure in May: 29.94"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in May
Harpers Ferry, IA
- Average wind speed in May: 8.5mph
The windiest month (with the highest average wind speed) is April (9.9mph).
The calmest months (with the lowest average wind speed) are July and August (6.6mph).
Average humidity in May
Harpers Ferry, IA
- Average humidity in May: 81%
The months with the highest relative humidity are January and February (88%).
The month with the lowest relative humidity is October (76%).
Average rainfall in May
Harpers Ferry, IA
- Average rainfall in May: 3.19"
The wettest month (with the highest rainfall) is June (3.9").
The driest month (with the least rainfall) is January (0.75").
Average rainfall days in May
Harpers Ferry, IA
- Average rainfall days in May: 18.1 days
The month with the highest number of rainy days is June (18.6 days).
The month with the least rainy days is February (3.6 days).
Average snowfall in May
Harpers Ferry, IA
- Average snowfall in May: 0.04"
The month with the highest snowfall is February (3.94").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Harpers Ferry, IA
- Average snowfall days in May: 0.1 days
The month with the highest number of snowfall days is January (11.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Harpers Ferry, IA
- Average daylight in May: 14h and 4min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in May: 8h and 1min
The month with the most sunshine is August (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).
Average sunshine days in May
Harpers Ferry, IA
- Average sunshine days in May: 11.1 days
The month with the most sunshine days is November (19.4 days).
The month with the least sunshine days is June (9.6 days).
Average UV index in May
Harpers Ferry, IA
- Average UV index in May: 5
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, November and December (UV index 1).
Average cloud cover in May
Harpers Ferry, IA
- Average cloud cover in May: 45
The month with the most cloud cover is January (Cloud cover 64).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in May
Harpers Ferry, IA
- Average visibility in May: 6mi
The months with the highest visibility are March, April, May, June, October, November and December (6mi).
The months with the lowest visibility are January, February, July, August and September (5mi).
Harpers Ferry, Iowa, USA
Weather forecast for your location
2. Allow the app to use your location