The Electric Reliability Council of Texas, the state's power grid operator, is expected to pass its second test of the winter early next week, when another arctic front is anticipated to bring frigid temperatures to much of the state.

Temperatures are expected to dip below freezing on Sunday night, according to the National Weather Service. There also is a chance of freezing rain, sleet or snow early next week.

The Houston area is seeing an increasing chance that a mix of wintry precipitation—including snow—is headed in its direction. Space City Weather meteorologist Eric Berger said there is a growing possibility (about a 50-50 chance) of snow or sleet beginning next Monday night and Tuesday.

A chance of snow showers and sleet has emerged in the forecast. Here are five things we know so far about next week's freezing temperatures.

Houston has had measurable snowfall at least 20 times in its weather history, according to available data kept by the National Weather Service.