Winters in Pleasanton are mild, with temperatures ranging from freezing to moderate highs. January and December are the coolest months, but even then, temperatures rarely drop below 0°C. Spring arrives around March, bringing warmer temperatures that gradually increase throughout the season, peaking in April with average highs of 15°C. Summer is hot, with July and August being the warmest months, experiencing high temperatures above 30°C for most of the month. Autumn brings a return to milder weather, similar to winter, but with less extreme temperature fluctuations.