Thursday officially marks the first day of spring. The vernal equinox happened at 4:10 a.m., which means there will be nearly 12 hours of day and night. On this spring morning, temperatures are colder than Wednesday morning by as much as 25-30 degrees.

Thursday is the first day of astronomical spring. Here's what Texas can expect after an unusually cold and snowy winter.

The spring equinox will occur at 5:01 a.m. EDT on Thursday. Here's what to know about the start of the spring season.