2025 Compare Climate & Weather:
Chatham, MA vs Dewey Beach, DE

Highlights

On average, there are 203 sunny days per year in Dewey Beach. Chatham averages 201 sunny days per year. The US average is 205 sunny days.

Dewey Beach, Delaware gets 44.4 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.

Dewey Beach averages 12.3 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

Dewey Beach, Delaware
Summer High: the July high is around 86 degrees
Winter Low: the January low is 28.2
Rain: averages 44.4 inches of rain a year
Snow: averages 12.3 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 Dewey Beach is 7.4 (10=best), which means it is one of the most pleasant places in Delaware.

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

54°F

Today's Weather - Dewey Beach, DE

53°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Chatham / Dewey Beach

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 Dewey Beach with an average high temperature of 86.0°, which ranks it as cooler than most places in Delaware. In Dewey Beach, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Dewey Beach are September, June and May.

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 Dewey Beach with an average of 28.2°. This is one of the warmest places in Delaware.

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 Dewey Beach, there are 19.1 days annually when the high temperature is over 90°, which is cooler than most places in Delaware.

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 Dewey Beach, there are 70.2 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in Delaware.

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 Dewey Beach, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is one of the warmest places in Delaware.

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.


July is the wettest month in Dewey Beach with 4.3 inches of rain, and the driest month is February with 2.9 inches. The wettest season is Autumn with 27% of yearly precipitation and 22% occurs in Spring, which is the driest season. The annual rainfall of 44.4 inches in Dewey Beach means that it is drier than most places in Delaware.

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.

March is the rainiest month in Dewey Beach with 11.0 days of rain, and February is the driest month with only 9.6 rainy days. There are 123.3 rainy days annually in Dewey Beach, which is one of the rainiest places in Delaware. The rainiest season is Summer when it rains 27% of the time and the driest is Winter with only a 24% 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 12.3 inches in Dewey Beach means that it is less snowy than most places in Delaware.

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

February is the snowiest month in Dewey Beach with 5.5 inches of snow, and 4 months of the year have significant snowfall.