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Boston Weather: 47.0°F | A Few Clouds

Weather

A Bitterly Cold End to the Week

By Angela Zalucha
STAFF METEOROLOGIST

Winter continues to fight back this week, as temperatures Friday are forecast to be the lowest they have been all year. On average, the end of January is typically the coldest time of the year, although the end of this week will be somewhat colder than normal. While the forecast period for the most part looks dry, the primary concern will be strong winds, which together with the cold temperatures will produce wind chill values as low as -15 F (-26 C).

What does “wind chill” mean anyway? According to the National Weather Service, the Wind Chill Temperature (WCT) index is the cold we experience due to the combined effects of wind and a low temperature. As the wind increases, the body is cooled at a faster rate, causing the skin temperature to drop. The WCT index is calculated using an empirical formula based on heat loss rates of exposed skin that is a function of the actual air temperature and the wind speed. The WCT is only a perceived temperature by humans—a thermometer cannot measure WCT. Inanimate objects, such as rocks, are not affected by wind chills; your dog is but probably requires a different empirical formula. (Source: http://www.weather.gov/os/windchill/images/wind-chill-brochure.pdf.)

Extended Forecast

Today: Mostly sunny. High 37 F (3 C).

Tonight: Partly cloudy. Low 17 F (-8 C).

Tomorrow: Mostly cloudy. High 25 F (-4 C).

Friday: Cold and brisk. Low 5 F (-15 C). High 10 F (-12 C).

Saturday: Partly cloudy. Low 10 F (-12 C). High 30 F (-1 C).

Sunday: Chance of snow showers. Low 25 F (-4 C). High 35 F (2 C).