The temperatures are highest on average in July, at around , and lowest in January, at around . The highest temperature ever recorded in Saint-Martin-de-Londres was  on 1 August 1947; the coldest temperature ever recorded was  on 4 February 1963.
The temperatures are most extreme in Saint-Martin-de-Londres during July, averaging around , and least in January, averaging around . The highest temperature ever recorded was  on August 1, 1947; the lowest temperature ever recorded was  on February 4, 1963.