On average across the year, yes, Texas is hotter than Mississippi . Texas has an average temperature of 21°C/70°F and Mississippi has an average temperature of 19°C/66°F.
Texas's hottest month is August, with an average maximum temperature of 36°C/97°F, which is hotter than Mississippi's hottest month (July, with an average maximum temperature of 33°C/91°F).
On average across the year, no, Texas is not colder than Mississippi . Texas has an average minimum temperature of 15°C/59°F and Mississippi has an average minimum temperature of 13°C/55°F.
Texas's coldest month is January, with an average minimum temperature of 4°C/39°F, which is not colder than Mississippi's coldest month (also January, with an average minimum temperature of 3°C/37°F).
On average across the year, no, Texas has less rain than Mississippi. Texas has an average annual rainfall of 955mm and Mississippi has an average annual rainfall of 1540mm.
Texas's wettest month is May, with an average monthly rainfall of 137mm, which is drier than Mississippi's wettest month (April, with an average monthly rainfall of 170mm).