2025 Compare Climate & Weather:
Rockville, MD vs Cary, NC

Highlights

On average, there are 213 sunny days per year in Cary. Rockville averages 203 sunny days per year. The US average is 205 sunny days.

Cary, North Carolina gets 46.3 inches of rain, on average, per year. Rockville, Maryland gets 42.2 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Cary averages 4.1 inches of snow per year. Rockville averages 18.2 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Cary, North Carolina
Summer High: the July high is around 89.1 degrees
Winter Low: the January low is 29.9
Rain: averages 46.3 inches of rain a year
Snow: averages 4.1 inches of snow a year

Rockville, Maryland
Summer High: the July high is around 84.8 degrees
Winter Low: the January low is 25.1
Rain: averages 42.2 inches of rain a year
Snow: averages 18.2 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Cary is 7.5 (10=best), which means it is more comfortable than most places in North Carolina.

The annual BestPlaces Comfort Index for Rockville is 7.4 (10=best), which means it is one of the most pleasant places in Maryland.

Today's Weather - Rockville, MD

71°F

Today's Weather - Cary, NC

70°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Rockville / Cary

July is the hottest month for Rockville with an average high temperature of 84.8°, which ranks it as one of the coolest places in Maryland. In Rockville, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Rockville are September, June and May.

July is the hottest month for Cary with an average high temperature of 89.1°, which ranks it as about average compared to other places in North Carolina. In Cary, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Cary are May, September and October.

January has the coldest nighttime temperatures for Rockville with an average of 25.1°. This is about average compared to other places in Maryland.

January has the coldest nighttime temperatures for Cary with an average of 29.9°. This is about average compared to other places in North Carolina.

In Rockville, there are 13.9 days annually when the high temperature is over 90°, which is one of the coolest places in Maryland.

In Cary, there are 37.0 days annually when the high temperature is over 90°, which is about average compared to other places in North Carolina.

In Rockville, there are 88.3 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Maryland.

In Cary, there are 65.6 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in North Carolina.

In Rockville, there are 0.1 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Maryland.

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

May is the wettest month in Rockville with 4.3 inches of rain, and the driest month is February with 2.7 inches. The wettest season is Summer with 27% of yearly precipitation and 21% occurs in Spring, which is the driest season. The annual rainfall of 42.2 inches in Rockville means that it is drier than most places in Maryland.


August is the wettest month in Cary with 4.7 inches of rain, and the driest month is April with 3.1 inches. The wettest season is Autumn with 30% of yearly precipitation and 22% occurs in Spring, which is the driest season. The annual rainfall of 46.3 inches in Cary means that it is drier than most places in North Carolina.

May is the rainiest month in Rockville with 11.6 days of rain, and August is the driest month with only 8.2 rainy days. There are 112.3 rainy days annually in Rockville, which is about average compared to other places in Maryland. The rainiest season is Summer when it rains 28% of the time and the driest is Winter with only a 23% chance of a rainy day.

July is the rainiest month in Cary with 10.8 days of rain, and October is the driest month with only 6.9 rainy days. There are 107.1 rainy days annually in Cary, which is less rainy than most places in North Carolina. The rainiest season is Autumn when it rains 28% of the time and the driest is Winter with only a 21% chance of a rainy day.

An annual snowfall of 18.2 inches in Rockville means that it is snowier than most places in Maryland.

An annual snowfall of 4.1 inches in Cary means that it is snowier than most places in North Carolina.

January is the snowiest month in Rockville with 7.1 inches of snow, and 5 months of the year have significant snowfall.

January is the snowiest month in Cary with 2.2 inches of snow, and 3 months of the year have significant snowfall.