2025 Compare Climate & Weather:
Wellesley, MA vs Dayton, OH

Highlights

On average, there are 176 sunny days per year in Dayton. Wellesley averages 201 sunny days per year. The US average is 205 sunny days.

Dayton, Ohio gets 40.4 inches of rain, on average, per year. Wellesley, Massachusetts gets 48.7 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Dayton averages 17 inches of snow per year. Wellesley averages 49.9 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Dayton, Ohio
Summer High: the July high is around 85 degrees
Winter Low: the January low is 21.1
Rain: averages 40.4 inches of rain a year
Snow: averages 17 inches of snow a year

Wellesley, Massachusetts
Summer High: the July high is around 83 degrees
Winter Low: the January low is 16.7
Rain: averages 48.7 inches of rain a year
Snow: averages 49.9 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Dayton is 7.1 (10=best), which means it is more comfortable than most places in Ohio.

The annual BestPlaces Comfort Index for Wellesley is 6.9 (10=best), which means it is about average compared to other places in Massachusetts.

Today's Weather - Wellesley, MA

64°F

Today's Weather - Dayton, OH

52°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Wellesley / Dayton

July is the hottest month for Wellesley with an average high temperature of 83.0°, which ranks it as warmer than most places in Massachusetts. In Wellesley, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Wellesley are June, August and September.

July is the hottest month for Dayton with an average high temperature of 85.0°, which ranks it as warmer than most places in Ohio. In Dayton, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Dayton are September, June and May.

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

January has the coldest nighttime temperatures for Dayton with an average of 21.1°. This is warmer than most places in Ohio.

In Wellesley, there are 10.7 days annually when the high temperature is over 90°, which is hotter than most places in Massachusetts.

In Dayton, there are 17.2 days annually when the high temperature is over 90°, which is hotter than most places in Ohio.

In Wellesley, there are 134.9 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Massachusetts.

In Dayton, there are 104.8 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in Ohio.

In Wellesley, there are 3.4 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Massachusetts.

In Dayton, there are 2.8 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Ohio.

October is the wettest month in Wellesley with 4.5 inches of rain, and the driest month is February with 3.4 inches. The wettest season is Winter with 26% of yearly precipitation and 23% occurs in Spring, which is the driest season. The annual rainfall of 48.7 inches in Wellesley means that it is wetter than most places in Massachusetts.


May is the wettest month in Dayton with 4.7 inches of rain, and the driest month is February with 2.3 inches. The wettest season is Summer with 30% of yearly precipitation and 20% occurs in Spring, which is the driest season. The annual rainfall of 40.4 inches in Dayton means that it is wetter than most places in Ohio.

May is the rainiest month in Wellesley with 12.4 days of rain, and September is the driest month with only 9.0 rainy days. There are 128.4 rainy days annually in Wellesley, which is rainier than most places in Massachusetts. 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.

May is the rainiest month in Dayton with 13.2 days of rain, and August is the driest month with only 8.0 rainy days. There are 128.8 rainy days annually in Dayton, which is about average compared to other places in Ohio. 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.

An annual snowfall of 49.9 inches in Wellesley means that it is snowier than most places in Massachusetts.

An annual snowfall of 17.0 inches in Dayton means that it is less snowy than most places in Ohio.

January is the snowiest month in Wellesley with 14.7 inches of snow, and 6 months of the year have significant snowfall.

January is the snowiest month in Dayton with 5.9 inches of snow, and 4 months of the year have significant snowfall.