2025 Compare Climate & Weather:
Norristown, PA vs San Diego, CA

Highlights

On average, there are 266 sunny days per year in San Diego. Norristown averages 209 sunny days per year. The US average is 205 sunny days.

San Diego, California gets 11.7 inches of rain, on average, per year. Norristown, Pennsylvania gets 46.9 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

San Diego averages 0 inches of snow per year. Norristown averages 16.7 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

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

Norristown, Pennsylvania
Summer High: the July high is around 87.2 degrees
Winter Low: the January low is 21.2
Rain: averages 46.9 inches of rain a year
Snow: averages 16.7 inches of snow a year

BestPlaces Comfort Index

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.

The annual BestPlaces Comfort Index for Norristown is 7.2 (10=best), which means it is one of the most pleasant places in Pennsylvania.

Today's Weather - Norristown, PA

49°F

Today's Weather - San Diego, CA

68°F

Average Monthly High / Low (°F)

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

July is the hottest month for Norristown with an average high temperature of 87.2°, which ranks it as one of the hottest places in Pennsylvania. In Norristown, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Norristown are September, May and June.

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.

January has the coldest nighttime temperatures for Norristown with an average of 21.2°. This is warmer than most places in Pennsylvania.

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

In Norristown, there are 25.2 days annually when the high temperature is over 90°, which is one of the hottest places in Pennsylvania.

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 Norristown, there are 115.6 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Pennsylvania.

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 Norristown, there are 1.2 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Pennsylvania.

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.

September is the wettest month in Norristown with 4.6 inches of rain, and the driest month is February with 2.9 inches. The wettest season is Autumn with 26% of yearly precipitation and 22% occurs in Spring, which is the driest season. The annual rainfall of 46.9 inches in Norristown means that it is wetter than most places in Pennsylvania.


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.

April is the rainiest month in Norristown with 11.5 days of rain, and September is the driest month with only 8.0 rainy days. There are 113.6 rainy days annually in Norristown, which is one of the least rainy places in Pennsylvania. The rainiest season is Summer when it rains 29% of the time and the driest is Winter with only a 22% chance of a rainy day.

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.

An annual snowfall of 16.7 inches in Norristown means that it is one of the least snowy places in Pennsylvania.

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

February is the snowiest month in Norristown with 7.4 inches of snow, and 4 months of the year have significant snowfall.

Any measurable snowfall is a rare occurance in San Diego.