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Mostly cloudy Sunday with highs in the 40s, blast of Arctic air arrives in Philadelphia this week. Here's the forecast.

Sunday is off to a seasonal start with morning low temperatures just below the average for this time of year, in the mid-to-upper 20s.

Some areas of patchy and dense fog, and even freezing fog, have prompted a Freezing Fog Advisory in Kent County, Delaware until 9 a.m.

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Blast of arctic air arrives Sunday across the Philadelphia region. Here's the weather forecast.
CBS News Philadelphia

Sunday stays quiet with increasing clouds and highs ranging from the 30s northwest to low-and-mid 40s southeast. Some surfaces may stay slick through sunrise.

A cold front moves through Sunday night and opens the door to a sharp blast of Arctic air. Monday kicks off the coldest stretch, with highs only in the 20s and 30s and wind chills in the teens. Lows Monday night dip into the single digits and teens before a slight rebound Tuesday. 

Blast of arctic air arrives Sunday across the Philadelphia region. Here's the weather forecast.
CBS News Philadelphia

Another pair of weak systems arrives mid to late week with light, scattered precipitation and continued below-normal temperatures.

Here's your 7-day forecast:

Blast of arctic air arrives Sunday across the Philadelphia region. Here's the weather forecast.
CBS News Philadelphia

Sunday: Partly cloudy. High 43, Low 29.

Monday: Clouds, some sun. High 33. Low 31.

Tuesday: Coldest start yet. High 37, Low 16.

Wednesday: Chance p.m. rain. High 46, Low 31.

Thursday: A.m. shower chance. High 45, Low 38.

Friday: Partly cloudy. High 39, Low 32. 

Saturday: Shower chance. High 33, Low 27.  

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