2025 Compare Climate & Weather:
Rocky Hill, NJ vs Princeton, NJ

Highlights

On average, there are 204 sunny days per year in Princeton. Rocky Hill averages 207 sunny days per year. The US average is 205 sunny days.

Princeton, New Jersey gets 47.4 inches of rain, on average, per year. Rocky Hill, New Jersey gets 48.3 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Princeton averages 24 inches of snow per year. Rocky Hill averages 23 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Princeton, New Jersey
Summer High: the July high is around 85.6 degrees
Winter Low: the January low is 22
Rain: averages 47.4 inches of rain a year
Snow: averages 24 inches of snow a year

Rocky Hill, New Jersey
Summer High: the July high is around 85.7 degrees
Winter Low: the January low is 21.5
Rain: averages 48.3 inches of rain a year
Snow: averages 23 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Princeton is 7.2 (10=best), which means it is about average compared to other places in New Jersey.

The annual BestPlaces Comfort Index for Rocky Hill is 7.2 (10=best), which means it is about average compared to other places in New Jersey.

Today's Weather - Rocky Hill, NJ

77°F

Today's Weather - Princeton, NJ

77°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Rocky Hill / Princeton

July is the hottest month for Rocky Hill with an average high temperature of 85.7°, which ranks it as warmer than most places in New Jersey. In Rocky Hill, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Rocky Hill are September, June and August.

July is the hottest month for Princeton with an average high temperature of 85.6°, which ranks it as warmer than most places in New Jersey. In Princeton, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Princeton are September, June and August.

January has the coldest nighttime temperatures for Rocky Hill with an average of 21.5°. This is colder than most places in New Jersey.

January has the coldest nighttime temperatures for Princeton with an average of 22.0°. This is colder than most places in New Jersey.

In Rocky Hill, there are 17.3 days annually when the high temperature is over 90°, which is about average compared to other places in New Jersey.

In Princeton, there are 16.8 days annually when the high temperature is over 90°, which is about average compared to other places in New Jersey.

In Rocky Hill, there are 112.9 days annually when the nighttime low temperature falls below freezing, which is colder than most places in New Jersey.

In Princeton, there are 109.7 days annually when the nighttime low temperature falls below freezing, which is colder than most places in New Jersey.

In Rocky Hill, there are 0.5 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in New Jersey.

In Princeton, there are 0.3 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in New Jersey.

July is the wettest month in Rocky Hill with 5.2 inches of rain, and the driest month is February with 2.7 inches. The wettest season is Autumn with 28% of yearly precipitation and 21% occurs in Spring, which is the driest season. The annual rainfall of 48.3 inches in Rocky Hill means that it is wetter than most places in New Jersey.


July is the wettest month in Princeton with 5.1 inches of rain, and the driest month is February with 2.5 inches. The wettest season is Autumn with 29% of yearly precipitation and 20% occurs in Spring, which is the driest season. The annual rainfall of 47.4 inches in Princeton means that it is about average compared to other places in New Jersey.

May is the rainiest month in Rocky Hill with 12.1 days of rain, and September is the driest month with only 8.5 rainy days. There are 120.0 rainy days annually in Rocky Hill, which is rainier than most places in New Jersey. The rainiest season is Summer when it rains 28% of the time and the driest is Winter with only a 22% chance of a rainy day.

May is the rainiest month in Princeton with 12.4 days of rain, and September is the driest month with only 8.7 rainy days. There are 124.6 rainy days annually in Princeton, which is one of the rainiest places in New Jersey. The rainiest season is Summer when it rains 28% of the time and the driest is Winter with only a 22% chance of a rainy day.

An annual snowfall of 23.0 inches in Rocky Hill means that it is about average compared to other places in New Jersey.

An annual snowfall of 24.0 inches in Princeton means that it is about average compared to other places in New Jersey.

February is the snowiest month in Rocky Hill with 7.7 inches of snow, and 5 months of the year have significant snowfall.

February is the snowiest month in Princeton with 8.3 inches of snow, and 5 months of the year have significant snowfall.