May weather forecastOld Greenwich, CT
May
Weather in May
Old Greenwich revels in the heart of spring throughout May. The weather further warms up, and the nature bursts into a riot of colors, courtesy of the longer days and ample sunshine. Visually, it is a beautiful month as everything seems fresh and lively, becoming a favorite time for photographers and nature lovers. Staying outside in the late evenings is a treat, with the cool sea wind soothing the skin heated by the day’s sun. Despite the rise in humidity, the weather remains comfortable, providing a conducive atmosphere for all outdoor activities.Temperature
With the onset of May, Old Greenwich's average high-temperature sees a rise, moving from April's mild 55.4°F (13°C) to a still refreshing 65.8°F (18.8°C). Throughout the month of May, Old Greenwich observes an average nighttime temperature of 53.2°F (11.8°C).Humidity
The months with the highest humidity are February, May, June and December, with an average relative humidity of 75%.Rainfall
In Old Greenwich, during May, the rain falls for 17.4 days and regularly aggregates up to 3.11" (79mm) of precipitation. In Old Greenwich, during the entire year, the rain falls for 166.6 days and collects up to 38.07" (967mm) of precipitation.Snowfall
In Old Greenwich, snow does not fall in May through October.Ocean temperature
In May, the average ocean temperature is 51.4°F (10.8°C).Note: It is risky to swim in 51.4°F (10.8°C). Temperatures beneath 50°F (10°C) induce rapid cold shock and hyperventilation.
Daylight
In Old Greenwich, the average length of the day in May is 14h and 29min.On the first day of the month, sunrise is at 5:51 am and sunset at 7:51 pm. On the last day of May, sunrise is at 5:24 am and sunset at 8:19 pm EDT.
Sunshine
In Old Greenwich, the average sunshine in May is 8.7h.UV index
In Old Greenwich, the average daily maximum UV index in May is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for the average person.Note: In May, the UV index of 5 transforms into the following advice:
Act with care - Obligation to protect against skin and eye damage is highlighted. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Old Greenwich, CT
- Average high temperature in May: 65.8°F
The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is January (36°F).
- Average low temperature in May: 53.2°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 (26.2°F).
Average pressure in May
Old Greenwich, CT
- Average pressure in May: 30.01"Hg
The month with the highest atmospheric pressure is November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in May
Old Greenwich, CT
- Average wind speed in May: 7.6mph
The windiest month (with the highest average wind speed) is January (10.1mph).
The calmest month (with the lowest average wind speed) is July (6.6mph).
Average humidity in May
Old Greenwich, CT
- Average humidity in May: 75%
The months with the highest relative humidity are February, May, June and December (75%).
The month with the lowest relative humidity is August (71%).
Average rainfall in May
Old Greenwich, CT
- Average rainfall in May: 3.11"
The wettest month (with the highest rainfall) is July (4.13").
The driest month (with the least rainfall) is January (2.44").
Average rainfall days in May
Old Greenwich, CT
- Average rainfall days in May: 17.4 days
The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is January (8.6 days).
Average snowfall in May
Old Greenwich, CT
- Average snowfall in May: 0"
The month with the highest snowfall is February (2.6").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in May
Old Greenwich, CT
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is February (7.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average sea temperature in May
Old Greenwich, CT
- Average sea temperature in May: 51.4°F
The best month for swimming (with the highest average sea temperature) is August (73.1°F).
The coldest month (with the lowest average sea temperature) is February (39.5°F).
Average daylight in May /
Average sunshine in May
Old Greenwich, CT
- Average daylight in May: 14h and 30min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in May: 8h and 42min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The months with the least sunshine are February and December (Average sunshine: 4h and 42min).
Average sunshine days in May
Old Greenwich, CT
- Average sunshine days in May: 11.7 days
The month with the most sunshine days is November (17.9 days).
The month with the least sunshine days is June (11.1 days).
Average UV index in May
Old Greenwich, CT
- Average UV index in May: 5
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in May
Old Greenwich, CT
- Average cloud cover in May: 44
The month with the most cloud cover is December (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility in May
Old Greenwich, CT
- 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).
