May weather forecastNew Castle, DE
May
Weather in May
May in New Castle signifies the true arrival of summer. Weather in this month is characterized by the highest average low temperature of 55°F (12.8°C) observed in the year so far. Residents enjoy pleasant mornings and late evenings thanks to the warm weather. The days become longer, and the city experiences a good amount of sunshine. Cloud activity decreases, allowing the sun to shine brighter and longer.Temperature
New Castle sees an increase in the average high-temperature with the arrival of May, moving from April's refreshing 61.7°F (16.5°C) to an agreeable 72°F (22.2°C). New Castle's temperature in May lowers to a consistent average of 55°F (12.8°C) during the nights.Humidity
In May, the average relative humidity is 77%.Rainfall
In New Castle, in May, it is raining for 16.8 days, with typically 2.05" (52mm) of accumulated precipitation. In New Castle, during the entire year, the rain falls for 143.2 days and collects up to 21.89" (556mm) of precipitation.Snowfall
In New Castle, snow does not fall in May through October.Ocean temperature
In New Castle, in May, the average water temperature is 54°F (12.2°C).Note: Entering waters of 54°F (12.2°C) is life-endangering. A mere moment in 55.4°F (13°C) waters feels piercing cold, and below 50°F (10°C) it can lead to immediate cold shock and cessation of breathing control, depending on body resilience.
Daylight
The average length of the day in May is 14h and 23min.On the first day of May, sunrise is at 6:01 am and sunset at 7:56 pm. On the last day of the month, sunrise is at 5:36 am and sunset at 8:23 pm EDT.
Sunshine
The average sunshine in May is 8.7h.UV index
May through August, with an average maximum UV index of 6, are months with the highest UV index. A UV Index reading of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for the ordinary person.Note: The UV index of 6 during May translates into the following guidance:
Undertake protective measures and comply with sun safety rules. Shielding against skin and eye damage is essential. The hours from 10 a.m. to 4 p.m. have the most intense UV radiation. As much as possible, limit direct sun exposure during this period. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
New Castle, DE
- Average high temperature in May: 72°F
The warmest month (with the highest average high temperature) is July (84.9°F).
The month with the lowest average high temperature is January (37.8°F).
- Average low temperature in May: 55°F
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (26.1°F).
Average pressure in May
New Castle, DE
- Average pressure in May: 30.01"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in May
New Castle, DE
- Average wind speed in May: 6.9mph
The windiest months (with the highest average wind speed) are February and March (8.8mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).
Average humidity in May
New Castle, DE
- Average humidity in May: 77%
The month with the highest relative humidity is October (78%).
The month with the lowest relative humidity is April (72%).
Average rainfall in May
New Castle, DE
- Average rainfall in May: 2.05"
The wettest month (with the highest rainfall) is August (2.83").
The driest month (with the least rainfall) is January (1.38").
Average rainfall days in May
New Castle, DE
- Average rainfall days in May: 16.8 days
The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is January (7.8 days).
Average snowfall in May
New Castle, DE
- Average snowfall in May: 0"
The month with the highest snowfall is January (1.69").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in May
New Castle, DE
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is January (5.2 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average sea temperature in May
New Castle, DE
- Average sea temperature in May: 53.9°F
The best month for swimming (with the highest average sea temperature) is August (76.3°F).
The coldest month (with the lowest average sea temperature) is February (40.9°F).
Average daylight in May /
Average sunshine in May
New Castle, DE
- Average daylight in May: 14h and 24min
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 24min).
- Average sunshine in May: 8h and 42min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).
Average sunshine days in May
New Castle, DE
- Average sunshine days in May: 11.8 days
The month with the most sunshine days is November (20.1 days).
The month with the least sunshine days is May (11.8 days).
Average UV index in May
New Castle, 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, February, November and December (UV index 2).
Average cloud cover in May
New Castle, DE
- Average cloud cover in May: 45
The months with the most cloud cover are February and March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 30).
Average visibility in May
New Castle, 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).
