On average across the year, yes, Missouri is hotter than Oregon . Missouri has an average temperature of 14°C/57°F and Oregon has an average temperature of 12°C/54°F.
Missouri's hottest month is July, with an average maximum temperature of 32°C/90°F, which is hotter than Oregon's hottest month (August, with an average maximum temperature of 29°C/84°F).
On average across the year, no, Missouri is not colder than Oregon . Missouri has an average minimum temperature of 8°C/46°F and Oregon has an average minimum temperature of 6°C/43°F.
Missouri's coldest month is January, with an average minimum temperature of -5°C/23°F, which is colder than Oregon's coldest month (also January, with an average minimum temperature of 1°C/34°F).
On average across the year, yes, Missouri has more rain than Oregon. Missouri has an average annual rainfall of 1122mm and Oregon has an average annual rainfall of 934mm.
Missouri's wettest month is May, with an average monthly rainfall of 142mm, which is wetter than Oregon's wettest month (December, with an average monthly rainfall of 140mm).