The climate of Blenheim is generally very settled, largely due to the rain shadow effect of the mountain ranges to the west which shelter Blenheim from the heaviest of rains that hit the western part of the South Island.
Summers are typically warm & dry while winters are normally cool & frosty with clear sunny days that follow. Snowfall in Blenheim is rare as it is sheltered from cold southerly weather by the mountain ranges to the south.
Thunderstorms are also an uncommon occurrence due to the sheltered aspect of Blenheim's climate, though there is a higher likelihood of these occurring in Summer months due to afternoon heating generating cloud buildups above the ranges.
The highest recorded temperature in Blenheim is 36.0C, the lowest -8.8C
