Photo: Montgomery County Planning Commission · CC BY-SA 2.0Precipitation in Bryn Athyn tops that of 75% of U.S. towns: 48 inches a year
Sunny July days climb to about 87°. The seasons are far apart: from a winter night to a summer afternoon the average spans 63°. Summer afternoons here are warmer than in 60% of U.S. towns. Radiators earn their keep from November to March, the months that average under 50°.
A year in Bryn Athyn at a glance
Each month’s typical high and low, and what it brings.
What stands out about Bryn Athyn’s climate
Compared with towns across the U.S., with Bryn Athyn’s place in Pennsylvania beside it.
What a year in Bryn Athyn feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 185 frost-free days a year
In half of years the last 32° night comes by April 21 and the first by October 25. Frost and day counts come from NOAA’s station at Neshaminy Falls, PA, 6 miles from the town’s center, 180 ft lower.
The 2023 USDA map puts Bryn Athyn’s center in zone 7b: the coldest night of a typical winter, averaged over 1991–2020, reaches about 5°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
About 20 inches of snow a winter
Snow, measured at Neshaminy Falls, PA, falls mostly in January. Precipitation (rain plus melted snow) adds up to 48 inches a year; July is the wettest month and February the driest. Rain or snow falls on about 120 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Bryn Athyn
85% of the work is heating. Months averaging under 55° run from November through April.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Neshaminy Falls, PA.
Living with Bryn Athyn’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
185 frost-free days in zone 7b. The last frost comes by Apr 21 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 25.
Months with highs of 62–84° and lows of 40° or more: April, May, June, September and October. 6.2 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Bryn Athyn from natural hazards, river flooding is the largest share (68%); heat waves, cold waves, winter storms and ice storms together are 15%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Bryn Athyn and its neighbors
Every town next door is within a degree of Bryn Athyn in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Bryn Athyn’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| Bryn Athyn, PA | 24° | 87° | 48" | 20" |
| Cynthiana, KY | 24° | 87° | 48" | 16" |
| Amelia, OH | 23° | 86° | 46" | 23" |
| North Vernon, IN | 23° | 86° | 48" | 17" |
| Clarksburg, WV | 23° | 85° | 47" | 24" |
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.
Warmer than it used to be
The last 30 years in Bryn Athyn averaged 2.2° warmer than the 1900s. The biggest change is in December (+3.8°).
A bigger shift than in 96% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How Bryn Athyn compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Bryn Athyn’s place among Pennsylvania’s.
Bryn Athyn weather by month
Highs, lows and precipitation from NOAA’s grid at Bryn Athyn’s center; snow, wet days and snow on the ground from Neshaminy Falls, PA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 40° | 24° | 3.5" | 7.0" | 11 | 6 | 24° – 39° |
| February | 44° | 25° | 2.8" | 5.7" | 10 | 6 | 24° – 42° |
| March | 52° | 32° | 4.2" | 3.5" | 11 | 3 | 37° – 51° |
| April | 64° | 41° | 3.8" | 0.0" | 11 | 0 | 49° – 58° |
| May | 73° | 51° | 3.9" | 0.0" | 11 | 0 | 57° – 68° |
| June | 82° | 61° | 4.3" | 0.0" | 11 | 0 | 68° – 75° |
| July | 87° | 66° | 4.8" | 0.0" | 10 | 0 | 72° – 80° |
| August | 85° | 64° | 4.5" | 0.0" | 9 | 0 | 70° – 79° |
| September | 78° | 57° | 4.4" | 0.0" | 9 | 0 | 65° – 72° |
| October | 66° | 46° | 4.1" | 0.1" | 9 | 0 | 51° – 62° |
| November | 55° | 36° | 3.3" | 0.2" | 9 | 0 | 40° – 50° |
| December | 45° | 29° | 4.3" | 3.4" | 11 | 3 | 29° – 49° |
| Year | 64° | 44° | 47.9" | 19.9" | 120 | 18 |
How much a month can swing
A normal is an average. December swings the most: from 1991 to 2020 its average ranged from 29° to 49°. September is the most reliable, staying within 7°.
Where Bryn Athyn’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at Bryn Athyn’s center.
- Snow: Neshaminy Falls, PA.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Neshaminy Falls, PA, 6 miles from the town’s center, 180 ft lower; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Bryn Athyn’s climate
What is the weather like in Bryn Athyn?
A typical July afternoon reaches 87°, a January night drops to 24°, and about 20 inches of snow falls in a normal winter. Milder January nights than 59% of U.S. towns; hotter July afternoons than 60% of U.S. towns.
How cold does it get in Bryn Athyn in winter?
January nights average 24°. About 120 nights a year reach 32° or below. In the coldest January of the last 30 years the month averaged 24°.
How much snow does Bryn Athyn get?
About 20 inches in a normal winter at Neshaminy Falls, PA, most of it in January, with snow on the ground about 18 days a year.
How hot does it get in Bryn Athyn?
July, with a typical high of 87° and a low of 66°. About 27 days a year reach 90° (Neshaminy Falls, PA).
When is the first and last frost in Bryn Athyn?
In half of years the last spring frost (32°) comes by April 21 and the first fall frost by October 25, about 185 frost-free days, at Neshaminy Falls, PA.
What growing zone is Bryn Athyn in?
Zone 7b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 5°.
What is the best time of year to visit Bryn Athyn?
By one simple rule (highs of 62–84° and lows of 40° or more), April, May, June, September and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Bryn Athyn getting warmer?
Yes: 1991–2020 averaged 2.2° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 96% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Bryn Athyn.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.