Tigard's winters are cool and occasionally cold, with January averaging around 7°C, while February is slightly chillier at 5°C. Spring brings a noticeable warming trend, with temperatures rising steadily from March's average of 7°C to April's 12°C. The summer months are warm, but not hot, with July and August averaging around 22°C, while June and September are slightly cooler. Autumn is mild, with October and November averages ranging from 10-12°C, before dropping back down into winter.