Decin's climate is marked by cold winters, with temperatures often dropping below freezing in January and February, averaging around -1°C. As spring approaches, temperatures gradually rise, reaching averages of 5°C in April and 10°C in May. Summer months bring warmth, with June and July averaging highs above 19°C and 18°C respectively, while August's average is slightly lower at 16°C. Autumn brings a return to cooler temperatures, with October and November averaging around 8°C and 3°C, before winter sets back in, with December temperatures ranging from -12°C to 15°C.