Tulsa's winters are quite chilly, with temperatures often dropping below freezing and averaging around 4°C in January. Spring brings a steady warming trend, with March and April averaging around 13°C and 15°C respectively. Summers are hot and humid, with July and August temperatures frequently reaching highs of over 30°C and averaging around 27°C. Autumn is mild, but temperatures can drop quickly as winter approaches again, with November and December averages mirroring each other at around 11°C. Overall, the temperature variation throughout the year is quite significant in Tulsa.