May weather forecastDerby, CT
May
Weather in May
As we move into May, the city of Derby, Connecticut transforms under clear, sunny skies and warm temperatures. Seasonal changes bring about a visible enhancement of the city's natural beauty. Regular showers continue to sustain the thriving flora, painting the city with hues of vibrant green. The approach of June ushers in even higher temperatures, signaling the impending arrival of summer in all its grandeur.Temperature
May's arrival in Derby, Connecticut, sees a rise in the average high-temperature, jumping from April's 55.4°F (13°C) to a still refreshing 66.7°F (19.3°C). Throughout the month of May, Derby expects an average low of 51.4°F (10.8°C).Humidity
In Derby, Connecticut, the average relative humidity in May is 76%.Rainfall
In Derby, Connecticut, in May, it is raining for 17.2 days, with typically 2.83" (72mm) of accumulated precipitation. Throughout the year, in Derby, Connecticut, there are 169.1 rainfall days, and 36.26" (921mm) of precipitation is accumulated.Snowfall
May through October are months without snowfall.Daylight
In Derby, the average length of the day in May is 14h and 31min.On the first day of May in Derby, sunrise is at 5:48 am and sunset at 7:50 pm. On the last day of the month, sunrise is at 5:21 am and sunset at 8:18 pm EDT.
Sunshine
In May, the average sunshine in Derby, Connecticut, is 8.7h.UV index
The average daily maximum UV index in May in Derby is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for average individuals.Note: The maximum daily UV index of 5 in May converts into the following recommendations:
Exercise caution. Those with pale skin may experience burns in less than half an hour. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Be informed! The Sun's UV radiation can be nearly doubled due to the reflection from snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Derby, CT
- Average high temperature in May: 66.7°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 (34.7°F).
- Average low temperature in May: 51.4°F
The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (24.6°F).
Average pressure in May
Derby, 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
Derby, CT
- Average wind speed in May: 7.2mph
The windiest month (with the highest average wind speed) is January (9.6mph).
The calmest months (with the lowest average wind speed) are July and August (6.2mph).
Average humidity in May
Derby, CT
- Average humidity in May: 76%
The month with the highest relative humidity is February (77%).
The month with the lowest relative humidity is April (72%).
Average rainfall in May
Derby, CT
- Average rainfall in May: 2.83"
The wettest month (with the highest rainfall) is December (4.06").
The driest month (with the least rainfall) is September (2.24").
Average rainfall days in May
Derby, CT
- Average rainfall days in May: 17.2 days
The month with the highest number of rainy days is July (18 days).
The month with the least rainy days is January (9.4 days).
Average snowfall in May
Derby, CT
- Average snowfall in May: 0"
The month with the highest snowfall is February (3.23").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in May
Derby, CT
- Average snowfall days in May: 0.2 days
The month with the highest number of snowfall days is February (7.8 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in May /
Average sunshine in May
Derby, 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 months with the most sunshine are July and August (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).
Average sunshine days in May
Derby, CT
- Average sunshine days in May: 11.8 days
The month with the most sunshine days is November (17.5 days).
The month with the least sunshine days is June (10.3 days).
Average UV index in May
Derby, 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
Derby, CT
- Average cloud cover in May: 44
The months with the most cloud cover are February and December (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility in May
Derby, 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).
