Winters in Fair Lawn are cold and variable, with temperatures often dropping below freezing, averaging around 2°C in January and 1°C in February. Spring arrives slowly, but by April temperatures have risen significantly, averaging a mild 12°C. Summers are warm to hot, with July and August seeing highs above 35°C, but not excessively so. Autumn is similar to spring, with temperatures gradually cooling over the course of the season, averaging around 17°C in October. Winters return, bringing chilly conditions once again by December, although still relatively mild compared to January and February.