Kyustendil's climate is quite varied throughout the year. Winters are cold, with temperatures often dropping below freezing and averaging around 3°C in January and December. As spring approaches, temperatures gradually rise, reaching an average of 9°C in April and May, with occasional warmer days that can reach up to 28-31°C. Summer months bring warm to hot conditions, with July and August averaging around 24-23°C, but with frequent spikes above 38-40°C. Autumn is mild, with temperatures dropping back down to around 8-9°C in October and November.