Winters in Gliwice are cold and variable, with temperatures often dropping below freezing point in January and December. Spring arrives in March, but temperatures remain quite low, averaging around 1°C. May marks the beginning of warmer months, with average highs reaching 11°C, while June and July are warmest, with averages above 18°C. Autumn brings a return to cooler temperatures, with September and October experiencing average highs around 15°C and 10°C respectively. December and January are the coldest months, with temperatures often below -6°C.