Sunderland's winters are cold and occasionally frosty, with temperatures often below freezing point in January and February. Spring brings mild temperatures, gradually warming up towards the end of March and April. May marks a significant rise in temperature, averaging around 4C, while June is characterised by pleasant highs, with average temperatures reaching 9C. Summer months bring warmer days, particularly July, where temperatures can soar to 21C, but still experience some cooler nights. Autumn returns to milder conditions, with October temperatures averaging 6C before dropping again in November and December.