A hard freeze warning is in effect for Halloween, Oct. 31 evening, according to the National Weather Service.
Very cold air is expected to filter into the region on Friday, combining with light winds and clear skies to allow temperatures to fall below freezing by 10 p.m. Friday, the weather service said.
The temperatures will drop into the 20s throughout the area by sunrise on Saturday.
These temperatures are expected to effectively end the growing season for the region.
Today, the weather will be sunny with a high near 65. The north northwest wind will be 10 to 16 mph, with gusts as high as 23 mph.
Tonight, the low will be around 39. The north wind will be 10 to 15 mph, with gusts as high as 21 mph.
Friday, look for sunny skies and a high near 44. The north wind will be from 10 to 14 mph with gusts as high as 20 mph.
Friday night, Halloween, look for widespread frost after 3 a.m. The skies will be mostly clear, with a low around 26. The north wind will be 3 to 7 mph.
At 6 p.m. Friday, the temperature will be about 42 degrees, according to the weather service. By 9 p.m., it will be 34 degrees, and at midnight, it will be 31 degrees.
On Saturday, there will be widespread frost before 9 a.m. It will be 27 degrees around 6 a.m. The skies will be mostly sunny with a high near 47. A light east wind will become south southeast 5 to 9 mph in the morning.
Saturday night, the skies will be mostly cloudy with a low of 40.
Sunday, look for partly sunny skies with a high near 57.
Rain is in the forecast for Sunday night, when there will be a 30 percent chance of showers. On Monday, there will be a 50 percent chance of rain and a high of 61.
On Tuesday, Election Day, the forecast is partly sunny with a high near 56.