The hottest month in New Jersey is July when the average maximum temperature is 30°, average temperature is 25° and average minimum temperature is 20°.
The coolest month in New Jersey is January when the average maximum temperature is 5°, average temperature is 0° and average minimum temperature is -4°.
The longest days in New Jersey are in June, with an average of 15 hours of daylight per day. December has the shortest days with an average of 9.4 hours of daylight per day.
The sunniest days in New Jersey are in April which has the most hours of sunshine per day with an average of 9.1 hours of sunshine per day, making it a sunny month with few clouds. December has the least sunshine with an average of 7 hours of sunshine per day, making it a quite sunny month with some cloud cover.
The ultraviolet index is the highest in July when it reaches 9.8 and lowest in December when it reaches 1.7.
An ultraviolet index reading of 8 to 10 indicates a very high risk of harm from unprotected sun exposure. Unprotected skin risks burning in less than 15 minutes. Take extra precautions because unprotected skin and eyes will be damaged and can burn quickly. Tanning will be safest before 10am and after 4pm but only with a good application of sun screen. For those with sensitive skin stay in the shade and wear protective clothing, a wide-brimmed hat, and UV-blocking sunglasses. Generously apply broad spectrum SPF 30+ sunscreen every 2 hours, even on cloudy days. Watch out for relections from water that may increase ultraviolet exposure.
The warmest sea water temperatures in New Jersey are found in August when they peak at 22° and lowest in March when they dip to 3°.
The sea is best for swimming between May and December when the temperature is above 13° which is very cold and bracing, it's not recommended you swim with out a full wet suit.
The wettest month in New Jersey is October with 2057.4cm of rain and June has the most days of rain with 11.5 days with some rain, a very wet time to visit the beach.
The driest month in New Jersey is January with 33.1cm of rain and November has the fewest days of rain with 8.6 days with some rain, a slightly wet time to visit the beach.
The most humid month in New Jersey is July with a dew point (an indicator of humidity) of 21° which is somewhat uncomfortable for most people in cities but fine on a beach.
The least humid month in New Jersey is January with a dew point of -2° which is a bit dry for some.
The most windy month in New Jersey is February when the average maximum windspeed is 29kmh and the average wind speed is 13kmh.
The least windy month in New Jersey is August when the average maximum windspeed is 22kmh and the average wind speed is 8kmh.