Exton has chilly, snowy winters and warm summers, with plenty of rain
A typical July afternoon reaches 86°, a January night drops to 22°, and about 31 inches of snow falls in a normal winter.
A year in Exton at a glance
Each month’s typical high and low, and what it brings.
What stands out about Exton’s climate
Read from where Exton sits among Pennsylvania’s towns. The page puts what stands out first.
About 174 frost-free days a year
In half of years the last 32° night comes by April 26 and the first by October 18.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
What a year in Exton feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
Warmer than it used to be
The last 30 years in Exton averaged 1.9° warmer than the 1900s. The biggest change is in December (+3.4°).
A bigger shift than in 91% of U.S. towns.
Change by month
31 inches of snow, 48 of rain and melt
September is the wettest month and February the driest. Rain or snow falls on about 124 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Living with Exton’s climate
What the numbers mean for a garden, a driveway, a furnace and a free afternoon.
174 frost-free days. The last frost comes by Apr 26 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Oct 18.
About 31" a winter over 6 days with an inch or more, most in February. Snow covers the ground about 34 days a year.
Months averaging under 55° run from October through April. Heating is 86% of the year’s heating-and-cooling load.
About 27 days a year reach 90°, and July afternoons average 86°.
The nicest months are April, May, June, September and October. 1.1 miles of trails are waiting.
Parks & trails →Normals are averages. Ice storms, nor’easters, floods and heat waves are on the natural hazards page.
Natural hazards →Exton and its neighbors
Uwchlan has the coldest January nights next door (22°) and West Whiteland the hottest July afternoons (86°). Tap a town to see its climate.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value. Snow and frost-free days come from the nearest weather station, so neighbors often share them.
How Exton compares
Against every U.S. town on TownTapestry, each counted once, with its place in Pennsylvania.
Exton weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 40° | 22° | 3.5" | 7.9" | 11 | 11 | 22° – 39° |
| February | 43° | 24° | 2.8" | 13.2" | 9 | 14 | 23° – 41° |
| March | 51° | 31° | 4.2" | 4.1" | 11 | 4 | 35° – 50° |
| April | 64° | 40° | 3.8" | 0.4" | 11 | 0 | 48° – 57° |
| May | 73° | 50° | 3.9" | 0 | 11 | 0 | 57° – 68° |
| June | 82° | 60° | 4.3" | 0 | 11 | 0 | 67° – 75° |
| July | 86° | 65° | 4.7" | 0 | 10 | 0 | 72° – 79° |
| August | 84° | 63° | 4.4" | 0 | 10 | 0 | 69° – 77° |
| September | 78° | 56° | 4.9" | 0 | 9 | 0 | 64° – 71° |
| October | 66° | 44° | 4.3" | 0 | 11 | 0 | 50° – 62° |
| November | 54° | 34° | 3.3" | 0.5" | 10 | 1 | 39° – 49° |
| December | 44° | 27° | 4.2" | 4.4" | 11 | 4 | 28° – 47° |
| Year | 64° | 43° | 48.1" | 30.5" | 124 | 34 |
Heating and cooling a home in Exton
86% of the work is heating, so the furnace matters far more than the air conditioner.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. Source: NOAA station normals.
How much a month can swing
A normal is an average. December swings the most: from 1991 to 2020 its average ranged from 28° to 47°. September is the most reliable, staying within 7°.
Common questions about Exton’s climate
What is the coldest month in Exton?
January, with a typical high of 40° and a low of 22°.
What is the hottest month in Exton?
July, with a typical high of 86° and a low of 65°. About 27 days a year reach 90°.
How much snow does Exton get?
About 31 inches in a normal winter, most of it in February.
When is the first frost in Exton?
In half of years the first 32° night comes by October 18, and the last spring frost by April 26.
What is the rainiest month in Exton?
September, with 4.9 inches of rain and melted snow. The year totals 48 inches.
Neighbors talk weather
Gardens, snow, and the best days of the year in Exton.
Your answer becomes a post in Town Square.
Temperatures and rainfall come from NOAA’s gridded climate normals for Exton itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at West Chester 2 Nw, PA (4 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000. Today’s forecast: National Weather Service.