Grudziadz's climate is marked by cold winters with temperatures often below freezing, averaging around -1°C in January and December. Spring arrives slowly, warming up gradually from March, which sees average highs of 3°C, to May, where temperatures reach a pleasant 12°C. Summers are mild, with July being the warmest month, averaging 21°C, but still not hot by many standards, with highs rarely exceeding 33°C. Autumn is similar to spring in its gradual cooling trend, with October experiencing average temperatures around 9°C. Winters are long and cold, with February often seeing sub-zero temperatures and limited sunshine.