Tinley Park experiences cold winters, with January and February being the coldest months, averaging around -1°C and -6°C respectively. As spring approaches, temperatures gradually rise, reaching averages of 10°C in April and 15°C in May. Summer brings warmer days, with July and August often seeing highs above 30°C, but still experiencing cooler nights. Autumn is a transition period, with October averaging around 16°C before dropping to near-freezing temperatures in November. Winters return by December, bringing average lows of around 4°C.