Prepare for a cold snap this week as temperatures feel below freezing Monday and Tuesday, meteorologists said.

The mercury will dip about five to seven degrees below normal on Long Island this workweek thanks to air blowing in from Canada, an occurrence that is not unusual, according to the National Weather Service in Upton. Skies will remain largely clear. 

“We won’t see much of a change until Friday, when it turns warmer and there are more clouds,” said Jay Engle, a National Weather Service meteorologist.

After a mostly cloudy Sunday night with lows in the 20s, clouds will clear around daybreak Monday. While the high temperature will be in the upper 30s, it will feel much colder with wind chills in the upper teens and mid 20s, Engle said.

Monday night’s low will be in the 20s for most of Long Island and in the teens in the Pine Barrens.

Tuesday will be similar: a sunny day with a high in the upper 30s and wind chill in the 20s. The low will be in the mid to high 20s at night.

Wednesday will bring “lots of sunshine” and “not so much wind chill,” Engle said.  The high will be in the mid to upper 30s and the low in the lower 20s.

Thursday won’t be as cold, with a high temperature in the upper 30s and a low in the mid 30s.

Friday will be partly sunny with a high temperature in the upper 40s to 50 and a low in the mid 40s. There is a 50 percent chance of rain at night.

The average high temperature in Islip at this time of year is in the mid 40s, and the low near 30.

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