December weather forecast
Salem, MA

December is right back in the heart of winter with temperatures ranging from 23°F (-5°C) to 39°F (3.9°C) in Salem. With daylight hours shrinking to the shortest of the year and an average UV index of 1, outdoor activities are often limited. The city, already renowned for its historic charm, dons a magical look during the holiday season. The sea temperature drops to 45°F (7.2°C), preventing water-based activities. With the highest rainfall measure of the year at 4.1" (104mm), December is a time to enjoy indoor festivities.

Temperature

December brings a decrease in the average high-temperature, shifting from a cool 51.8°F (11°C) in November to an icy 39.2°F (4°C). Throughout December, an average nighttime temperature of 23°F (-5°C) is experienced.

Rainfall

In December, the rain falls for 12 days. Throughout December, 4.13" (105mm) of precipitation is accumulated. In Salem, during the entire year, the rain falls for 124 days and collects up to 43.03" (1093mm) of precipitation.

Ocean temperature

In December, the average ocean temperature in Salem is 44.6°F (7°C).
Note: Swimming in 44.6°F (7°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

Daylight

The month with the shortest days is December, with an average of 9h and 6min of daylight.
On the first day of December, sunrise is at 6:54 am and sunset at 4:11 pm. On the last day of the month, sunrise is at 7:13 am and sunset at 4:20 pm EST.

Sunshine

January, November and December, with an average of 5h of sunshine, are months with the least sunshine.

UV index

January and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for the ordinary person.
Note: The average daily UV index of 1 in December transforms into the following instructions:
Apart from children, who require continuous protection, most can endure sun exposure for up to an hour without experiencing burns. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.