2025 Compare Climate & Weather:
Chatham, MA vs Lexington, MA

Highlights

On average, there are 200 sunny days per year in Lexington. Chatham averages 201 sunny days per year. The US average is 205 sunny days.

Lexington, Massachusetts gets 48.2 inches of rain, on average, per year. Chatham, Massachusetts gets 47.6 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Lexington averages 52.2 inches of snow per year. Chatham averages 23.2 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Lexington, Massachusetts
Summer High: the July high is around 82.8 degrees
Winter Low: the January low is 16.7
Rain: averages 48.2 inches of rain a year
Snow: averages 52.2 inches of snow a year

Chatham, Massachusetts
Summer High: the July high is around 77.7 degrees
Winter Low: the January low is 23.4
Rain: averages 47.6 inches of rain a year
Snow: averages 23.2 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Lexington is 6.8 (10=best), which means it is less comfortable than most places in Massachusetts.

The annual BestPlaces Comfort Index for Chatham is 7.1 (10=best), which means it is one of the most pleasant places in Massachusetts.

Today's Weather - Chatham, MA

53°F

Today's Weather - Lexington, MA

62°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Chatham / Lexington

July is the hottest month for Chatham with an average high temperature of 77.7°, which ranks it as one of the coolest places in Massachusetts. In Chatham, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Chatham are July, August and June.

July is the hottest month for Lexington with an average high temperature of 82.8°, which ranks it as warmer than most places in Massachusetts. In Lexington, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Lexington are June, August and July.

January has the coldest nighttime temperatures for Chatham with an average of 23.4°. This is one of the warmest places in Massachusetts.

January has the coldest nighttime temperatures for Lexington with an average of 16.7°. This is colder than most places in Massachusetts.

In Chatham, there are 0.8 days annually when the high temperature is over 90°, which is one of the coolest places in Massachusetts.

In Lexington, there are 10.3 days annually when the high temperature is over 90°, which is hotter than most places in Massachusetts.

In Chatham, there are 96.7 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in Massachusetts.

In Lexington, there are 131.6 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Massachusetts.

In Chatham, there are 0.2 days annually when the nighttime low temperature falls below zero°, which is one of the warmest places in Massachusetts.

In Lexington, there are 3.7 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Massachusetts.

March is the wettest month in Chatham with 4.8 inches of rain, and the driest month is July with 3.3 inches. The wettest season is Summer with 27% of yearly precipitation and 22% occurs in Autumn, which is the driest season. The annual rainfall of 47.6 inches in Chatham means that it is drier than most places in Massachusetts.


March is the wettest month in Lexington with 4.6 inches of rain, and the driest month is February with 3.3 inches. The wettest season is Summer with 27% of yearly precipitation and 23% occurs in Spring, which is the driest season. The annual rainfall of 48.2 inches in Lexington means that it is about average compared to other places in Massachusetts.

December is the rainiest month in Chatham with 11.1 days of rain, and July is the driest month with only 7.2 rainy days. There are 108.5 rainy days annually in Chatham, which is less rainy than most places in Massachusetts. The rainiest season is Spring when it rains 28% of the time and the driest is Autumn with only a 21% chance of a rainy day.

May is the rainiest month in Lexington with 13.1 days of rain, and September is the driest month with only 9.3 rainy days. There are 134.9 rainy days annually in Lexington, which is one of the rainiest places in Massachusetts. 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.

An annual snowfall of 23.2 inches in Chatham means that it is one of the least snowy places in Massachusetts.

An annual snowfall of 52.2 inches in Lexington means that it is snowier than most places in Massachusetts.

February is the snowiest month in Chatham with 8.7 inches of snow, and 5 months of the year have significant snowfall.

January is the snowiest month in Lexington with 15.7 inches of snow, and 6 months of the year have significant snowfall.