On average across the year, no, Lebanon is not hotter than French Guiana . Lebanon has an average temperature of 19°C/66°F and French Guiana has an average temperature of 27°C/81°F.
Lebanon's hottest month is August, with an average maximum temperature of 34°C/93°F, which is hotter than French Guiana's hottest month (also August, with an average maximum temperature of 33°C/91°F).
On average across the year, yes, Lebanon is colder than French Guiana . Lebanon has an average minimum temperature of 13°C/55°F and French Guiana has an average minimum temperature of 23°C/73°F.
Lebanon's coldest month is January, with an average minimum temperature of 6°C/43°F, which is colder than French Guiana's coldest month (also January, with an average minimum temperature of 23°C/73°F).
On average across the year, no, Lebanon has less rain than French Guiana. Lebanon has an average annual rainfall of 529mm and French Guiana has an average annual rainfall of 1558mm.
Lebanon's wettest month is January, with an average monthly rainfall of 131mm, which is drier than French Guiana's wettest month (May, with an average monthly rainfall of 259mm).