From the Spaceflight Meteorology Group:

The maximum temperature at JSC today rose to 39 degrees.  Temperatures are not expected to rise much tonight and Thursday with readings remaining in the mid to upper 30s.  Some clearing skies late Thursday night will lead to around 6 or 7 hours of sub-freezing temperatures with a minimum temp of 29 forecast. Sunshine on Friday will bring the high back into the mid 40s.  One more short episode of freezing temperatures for a few hours around Saturday morning sunrise, with a low of 30.  As winds return from the southeast on Saturday the real warmup begins:  55 on Saturday and 64 on Sunday.

A weak upper air disturbance will bring a very small chance for a very brief period of light freezing rain or snow to areas of far north Houston tomorrow morning into mid-day…JSC should remain south of this remaining dry.