Hamilton (NJ) Temperature by Month

The average annual maximum temperature in Hamilton, New Jersey, United States of America is 18°C (64°F), with daytime highs ranging from 5°C (41°F) in January to 31°C (88°F) in July. This page covers monthly averages, day-night differences, and how Hamilton compares to cities worldwide.

In Hamilton, temperatures differ significantly between summer and winter months. Nighttime lows reflect this range, dropping from 19°C (66°F) in July to -5°C (23°F) in January.

The chart below illustrates the average maximum day and minimum night temperatures in Hamilton by month:

The coolest part of the day is typically between 4 AM and 6 AM, while 3 PM is usually the warmest, when solar heating is at its peak. July, the city's warmest month, averages 269 hours of sunshine.

The chart below shows the average temperature throughout the year:

Hamilton's average annual maximum temperature is 18°C (64°F). To put that in context, here's how it compares to a few well-known destinations:

Rome, Italy averages 20°C (68°F) annually, with reliably warm summers and comfortable winters.

Zermatt, Switzerland averages just 4°C (39°F) annually due to its altitude, with very cold winters and cool summers even at its warmest.

Boston, USA averages 16°C (61°F) annually, with four distinct seasons and cold winters that rival northern Europe.

Adelaide, Australia averages 21°C (70°F) a year, with warm summers, mild winters, and relatively low rainfall year-round.

Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.

The readings come from a range of sources, land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.

Seasonal temperature shifts influence more than just how warm it feels, they also drive changes in rainfall, cloud cover, and wind patterns throughout the year.

Warmer air holds more moisture, which tends to mean heavier or more frequent rain during the warmer months. When temperatures drop in winter, any precipitation that does fall is more likely to come as snow or sleet, though in Hamilton this rarely lasts long on the ground.

For more on Hamilton's weather, including monthly rainfall, sunshine hours, and humidity, visit our Hamilton climate page.