Alameda's winters are mild, with temperatures ranging from near-freezing to the mid-20s Celsius, averaging around 11 degrees in January and dipping slightly lower in December. As spring arrives, temperatures gradually warm up, reaching averages of 12-13 degrees by March and April. Summer months bring warmer conditions, with June and July being the hottest, often seeing highs above 40 degrees. Autumn sees a return to milder temperatures, with September's average temperature mirroring that of January's, before dropping to around 9 degrees in December.