Winters in Welwyn Garden City are typically cool, with temperatures ranging from around freezing point to as low as -5°C. Spring brings a gradual warming trend, with temperatures steadily increasing from March onwards, but still occasionally dipping below 0°C. Summer months see mild temperatures, often reaching highs of 27-30°C, while autumn is characterised by a slow decline in temperature, returning to around 10-15°C by November and December.