Lohja, Finland experiences a continental climate with distinct seasonal variations. Winters are harsh and cold, with temperatures often below freezing, especially in January and February, when the average low is around -7°C. Spring arrives in April, bringing milder temperatures, with averages rising to 4°C, while summer months of June and July are warmest, with averages peaking at 21°C. Autumn is relatively cool, with September's average temperature mirroring that of May, before dropping again in November.