Princeton's climate is classified under the Köppen climate classification as either a hot-summer humid continental climate (Dfa) or a humid subtropical climate (Cfa), depending on the isotherm used. This dual classification reflects the region's diverse weather patterns and seasonal variations.

During the summer months, residents often face episodes of extreme heat and humidity, with heat index values soaring to 100°F (37.8°C) or higher. July is typically the wettest month of the year, coinciding with the peak of thunderstorm activity, bringing both rainfall and humidity to the area.

In contrast, the winter months can usher in extreme cold and wind, leading to wind chill values that dip below 0°F (-17.8°C). This frigid climate contributes to the plant hardiness zone 6b designation for the Princeton Municipal Court, with an average annual extreme minimum air temperature recorded at -0.9°F (-18.3°C).

Snowfall in Princeton averages between 24 to 30 inches (610 to 760 mm) per season, with February emerging as the snowiest month. This period corresponds with the annual peak of nor'easter activity, which can bring heavy snow and strong winds to the region.

Overall, Princeton's climate is marked by a blend of extreme temperatures and seasonal variations, making it essential for residents to be prepared for both sweltering summers and bitterly cold winters.