May weather forecastHartly, DE
May
Weather in May
The last month of the spring, May, is an agreeable month in Hartly, Delaware, with temperature in the range of an average high of 71.2°F (21.8°C) and an average low of 55.9°F (13.3°C).Temperature
With the onset of May, Hartly's average high-temperature sees a rise, moving from April's enjoyable 62.2°F (16.8°C) to an agreeable 71.2°F (21.8°C). Hartly temperatures generally rest at a low of 55.9°F (13.3°C) during the May nights.Humidity
The most humid month is May, with an average relative humidity of 79%.Rainfall
In Hartly, in May, it is raining for 18.3 days, with typically 3.07" (78mm) of accumulated precipitation. In Hartly, during the entire year, the rain falls for 169.2 days and collects up to 34.96" (888mm) of precipitation.Snowfall
In Hartly, snow does not fall in May through October.Daylight
In Hartly, the average length of the day in May is 14h and 20min.On the first day of the month, sunrise is at 6:03 am and sunset at 7:56 pm. On the last day of May, sunrise is at 5:38 am and sunset at 8:22 pm EDT.
Sunshine
In May, the average sunshine is 8.9h.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 vulnerability from exposure to the Sun's UV rays for average individuals.Note: In May, the maximum UV index of 6 suggests this advice:
Resist extreme sun exposure. Guarding against solar damage is essential. Avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is most intense, and remember that not all shade structures provide full protection. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Hartly, DE
- Average high temperature in May: 71.2°F
The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is January (39.2°F).
- Average low temperature in May: 55.9°F
The month with the highest average low temperature is July (69.3°F).
The coldest month (with the lowest average low temperature) is January (27.9°F).
Average pressure in May
Hartly, DE
- Average pressure in May: 30.02"Hg
The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in May
Hartly, DE
- Average wind speed in May: 7.6mph
The windiest months (with the highest average wind speed) are February and March (9.5mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity in May
Hartly, DE
- Average humidity in May: 79%
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is April (73%).
Average rainfall in May
Hartly, DE
- Average rainfall in May: 3.07"
The wettest month (with the highest rainfall) is August (3.86").
The driest month (with the least rainfall) is January (2.13").
Average rainfall days in May
Hartly, DE
- Average rainfall days in May: 18.3 days
The month with the highest number of rainy days is July (19 days).
The month with the least rainy days is November (9.3 days).
Average snowfall in May
Hartly, DE
- Average snowfall in May: 0"
The month with the highest snowfall is March (2.6").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in May
Hartly, DE
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is January (4.5 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in May /
Average sunshine in May
Hartly, DE
- Average daylight in May: 14h and 18min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in May: 8h and 54min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 5h and 6min).
Average sunshine days in May
Hartly, DE
- Average sunshine days in May: 10.3 days
The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is July (9.5 days).
Average UV index in May
Hartly, DE
- 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 and December (UV index 2).
Average cloud cover in May
Hartly, DE
- Average cloud cover in May: 43
The months with the most cloud cover are February and March (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 29).
Average visibility in May
Hartly, DE
- 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).
