Radnor, PA Climate


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United States / Pennsylvania / Philadelphia-Camden-Wilmington Metro Area / Delaware County / Radnor / Zip Codes
Radnor, PA has a humid continental climate, with four distinct seasons. Summers are hot and humid with temperatures reaching the mid-80s while winters can be cold, with occasional snowfall. Spring and fall generally have mild temperatures and lots of rain or snow. Rainfall is abundant throughout the year, averaging around 40 inches per year. Radnor also experiences an average of 180 sunny days each year, making it a great place to enjoy the outdoors during the warmer months.

Radnor, Pennsylvania gets 48 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Radnor averages 21 inches of snow per year. The US average is 28 inches of snow per year.

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

Radnor gets some kind of precipitation, on average, 116 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.

Weather Highlights

Summer High: the July high is around 87 degrees
Winter Low: the January low is 21
Rain: averages 48 inches of rain a year
Snow: averages 21 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.

8.5 Summer - 5.5 Winter
June, September and May are the most pleasant months in Radnor, while January and February are the least comfortable months.

  ClimateRadnor, PennsylvaniaUnited States
  48.3 in.38.1 in.
  20.5 in.27.8 in.
  115.9 days106.2 days
  204 days205 days
  86.9°85.8°
  21.3°21.7°
  7.27
  3.84.3
  430 ft.2443 ft.
Climate
YOU SHOULD KNOW

Many people confuse weather and climate but they are different. Weather is the conditions of the atmosphere over a short period of time, and climate is how the atmosphere is over long periods of time.

Weather is how the atmosphere is behaving and its effects upon life and human activities. Weather can change from minute-to-minute. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric pressure.

Climate is the description of the long-term pattern of weather in a place. Climate can mean the average weather for a particular region and time period taken over 30 years. Climate is the average of weather over time.

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.
In Radnor, there are 23.3 days annually when the high temperature is over 90°, which is one of the hottest places in Pennsylvania.
January has the coldest nighttime temperatures for Radnor with an average of 21.3°. This is warmer than most places in Pennsylvania.
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 Radnor, there are 1.4 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Pennsylvania.
The humidity is usually comfortable in Radnor but some summer months can be sticky or muggy. July is the most humid month, though humidity is low for most of the year. The most humid months are July, August and June.
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.
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 20.5 inches in Radnor means that it is less snowy than most places in Pennsylvania. February is the snowiest month in Radnor with 8.3 inches of snow, and 5 months of the year have significant snowfall.
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