Grantham climate

Typical historical weather for Grantham, United States, averaged across 10 years of hourly climate data. Pick a date for a specific day.

Want today's actual conditions instead? See the current forecast for Grantham.

Annual average

8.2°C

across all months

Warmest month

27.4°C

Jul average high

Coolest month

-9.6°C

Jan average low

Annual rainfall

1107mm

total per year

Monthly averages

Average daily high/low temperature (band) and monthly rainfall (bars).

● Avg high● Avg low▮ Rainfall

Records on file

Hottest day

36.2°C

4 July 2018

Coldest day

-29.1°C

9 December 2025

Wettest day

65.3mm

18 December 2023

Windiest day

8m/s

17 February 2025