2025 Compare Climate & Weather:
Holliston, MA vs Radnor, PA

Highlights

On average, there are 204 sunny days per year in Radnor. Holliston averages 198 sunny days per year. The US average is 205 sunny days.

Radnor, Pennsylvania gets 48.3 inches of rain, on average, per year. Holliston, Massachusetts gets 49.8 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Radnor averages 20.5 inches of snow per year. Holliston averages 43.6 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Radnor, Pennsylvania
Summer High: the July high is around 86.9 degrees
Winter Low: the January low is 21.3
Rain: averages 48.3 inches of rain a year
Snow: averages 20.5 inches of snow a year

Holliston, Massachusetts
Summer High: the July high is around 83 degrees
Winter Low: the January low is 16.2
Rain: averages 49.8 inches of rain a year
Snow: averages 43.6 inches of snow a year

BestPlaces Comfort Index

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

The annual BestPlaces Comfort Index for Holliston is 7.0 (10=best), which means it is more comfortable than most places in Massachusetts.

Today's Weather - Holliston, MA

68°F

Today's Weather - Radnor, PA

68°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Holliston / Radnor

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

July is the hottest month for Radnor with an average high temperature of 86.9°, which ranks it as one of the hottest places in Pennsylvania. In Radnor, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Radnor are September, May and June.

January has the coldest nighttime temperatures for Holliston with an average of 16.2°. This is colder than most places in Massachusetts.

January has the coldest nighttime temperatures for Radnor with an average of 21.3°. This is warmer than most places in Pennsylvania.

In Holliston, there are 10.2 days annually when the high temperature is over 90°, which is hotter than most places in Massachusetts.

In Radnor, there are 23.3 days annually when the high temperature is over 90°, which is one of the hottest places in Pennsylvania.

In Holliston, there are 139.4 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Massachusetts.

In Radnor, there are 113.1 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Pennsylvania.

In Holliston, there are 4.4 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Massachusetts.

In Radnor, there are 1.4 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Pennsylvania.

March is the wettest month in Holliston with 4.7 inches of rain, and the driest month is February with 3.6 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 49.8 inches in Holliston means that it is wetter than most places in Massachusetts.


September is the wettest month in Radnor with 4.8 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 48.3 inches in Radnor means that it is one of the wettest places in Pennsylvania.

May is the rainiest month in Holliston with 11.5 days of rain, and February is the driest month with only 8.6 rainy days. There are 116.8 rainy days annually in Holliston, which is less rainy than most places in Massachusetts. The rainiest season is Summer when it rains 28% of the time and the driest is Spring with only a 24% chance of a rainy day.

April is the rainiest month in Radnor with 11.6 days of rain, and February is the driest month with only 8.4 rainy days. There are 115.9 rainy days annually in Radnor, which is less rainy than most places in Pennsylvania. The rainiest season is Summer when it rains 29% of the time and the driest is Winter with only a 23% chance of a rainy day.

An annual snowfall of 43.6 inches in Holliston means that it is about average compared to other places in Massachusetts.

An annual snowfall of 20.5 inches in Radnor means that it is less snowy than most places in Pennsylvania.

January is the snowiest month in Holliston with 12.7 inches of snow, and 6 months of the year have significant snowfall.

February is the snowiest month in Radnor with 8.3 inches of snow, and 5 months of the year have significant snowfall.