2025 Compare Climate & Weather:
San Diego, CA vs Hillsdale, NJ

Highlights

On average, there are 206 sunny days per year in Hillsdale. San Diego averages 266 sunny days per year. The US average is 205 sunny days.

Hillsdale, New Jersey gets 47.5 inches of rain, on average, per year. San Diego, California gets 11.7 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Hillsdale averages 27 inches of snow per year. San Diego averages 0 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Hillsdale, New Jersey
Summer High: the July high is around 82.1 degrees
Winter Low: the January low is 18.7
Rain: averages 47.5 inches of rain a year
Snow: averages 27 inches of snow a year

San Diego, California
Summer High: the July high is around 78.5 degrees
Winter Low: the January low is 45.6
Rain: averages 11.7 inches of rain a year
Snow: averages 0 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Hillsdale is 6.9 (10=best), which means it is one of the least comfortable places in New Jersey.

The annual BestPlaces Comfort Index for San Diego is 9.2 (10=best), which means it is one of the most pleasant places in California.

Today's Weather - Hillsdale, NJ

73°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: San Diego / Hillsdale

August is the hottest month for San Diego with an average high temperature of 80.2°, which ranks it as cooler than most places in California. In San Diego, there are 7 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for San Diego are July, September and August.

July is the hottest month for Hillsdale with an average high temperature of 82.1°, which ranks it as one of the coolest places in New Jersey. In Hillsdale, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Hillsdale are June, August and July.

December has the coldest nighttime temperatures for San Diego with an average of 45.3°. This is one of the warmest places in California.

January has the coldest nighttime temperatures for Hillsdale with an average of 18.7°. This is colder than most places in New Jersey.

In San Diego, there are 13.4 days annually when the high temperature is over 90°, which is cooler than most places in California.

In Hillsdale, there are 11.3 days annually when the high temperature is over 90°, which is cooler than most places in New Jersey.

In San Diego, there are 0.7 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in California.

In Hillsdale, there are 124.7 days annually when the nighttime low temperature falls below freezing, which is colder than most places in New Jersey.

In San Diego, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in California.

In Hillsdale, there are 5.0 days annually when the nighttime low temperature falls below zero°, which is one of the coldest places in New Jersey.

February is the wettest month in San Diego with 2.5 inches of rain, and the driest month is August with 0.0 inches. The wettest season is Spring with 55% of yearly precipitation and 2% occurs in Autumn, which is the driest season. The annual rainfall of 11.7 inches in San Diego means that it is drier than most places in California.


July is the wettest month in Hillsdale with 4.7 inches of rain, and the driest month is February with 2.7 inches. The wettest season is Autumn with 27% of yearly precipitation and 20% occurs in Spring, which is the driest season. The annual rainfall of 47.5 inches in Hillsdale means that it is about average compared to other places in New Jersey.

February is the rainiest month in San Diego with 6.8 days of rain, and August is the driest month with only 0.4 rainy days. There are 38.4 rainy days annually in San Diego, which is less rainy than most places in California. The rainiest season is Spring when it rains 48% of the time and the driest is Autumn with only a 4% chance of a rainy day.

May is the rainiest month in Hillsdale with 11.4 days of rain, and October is the driest month with only 8.7 rainy days. There are 121.3 rainy days annually in Hillsdale, which is rainier than most places in New Jersey. The rainiest season is Summer when it rains 27% of the time and the driest is Winter with only a 22% chance of a rainy day.

There is rarely any recorded snowfall in San Diego, ranking it as one of the least snowy places in California.

An annual snowfall of 27.0 inches in Hillsdale means that it is snowier than most places in New Jersey.

Any measurable snowfall is a rare occurance in San Diego.

January is the snowiest month in Hillsdale with 8.2 inches of snow, and 6 months of the year have significant snowfall.