Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. On bright days sunglasses that block both UVA and UVB rays should be worn. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. Note: The daily maximum UV index of 2 in December interpret into the following advice: A UV Index value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV rays for average individuals. UV indexJanuary through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index. Watch CBS News Local News After wet Saturday morning, more snow expected in afternoon Updated on: Ma/ 11:26 PM / CBS Boston BOSTON Happy Saturday No big surprises or changes. SunshineIn Boston, the average sunshine in December is 4.7h. On the last day of December, in Boston, sunrise is at 7:13 am and sunset at 4:21 pm EST. On the first day of the month, sunrise is at 6:53 am and sunset at 4:12 pm. Daylight The month with the shortest days in Boston, Massachusetts, is December, with an average of 9h and 8min of daylight. Even a few minutes in 55.4☏ (13☌) water is uncomfortable, and swimming below 50☏ (10☌) may cause total loss of breathing control and cold shock, depending on a person's physique. Heavy rain overnight may lead to street flooding & minor river/stream flooding. Lingering ocean-effect snow or rain showers continue through the day for the South Shore, Cape and Islands. Note: Swimming in 46.8☏ (8.2☌) is considered life-threatening. Snow arrives late this afternoon & changes to rain 5-10 PM from S to N, 2. Service forecasters said the expected snow totals will be record, or near record, in many. Boston, Massachusetts 7 Day Weather Forecast - The Weather. Ocean temperatureIn Boston, the average seawater temperature in December is 46.8☏ (8.2☌). Boston could see between 24 and 30 inches of snowfall from the storm, according to the service. Track rain, snow and storms in Boston and New England on the WCVB Storm Team 5 interactive radar.

Throughout the year, in Boston, there are 29.8 snowfall days, and 15.75' (400mm) of snow is accumulated.

In Boston, during December, snow falls for 5.2 days and regularly aggregates up to 2.83' (72mm) of snow. Snowfall January through May, October through December are months with snowfall. RainfallThe months with the most rainfall are March, April and December, with an average 2.91' (74mm) of precipitation. HumidityIn December, the average relative humidity in Boston, Massachusetts, is 76%. In December, in Boston, the average low-temperature is 29.7☏ (-1.3☌). TemperatureIn Boston, Massachusetts, the average high-temperature in December decreases from a chilly 49.5☏ (9.7☌) in November to a cold 39.9☏ (4.4☌). Jamaica Plain, MA 57 Cloudy Feels like 56 Humidity 84 Precip 0. December, the first month of the winter in Boston, is also a wintry month, with temperature in the range of an average low of 29.7☏ (-1.3☌) and an average high of 39.9☏ (4.4☌).

Boston snow forecast