Bryn Athyn, PA climate
Bryn Athyn has chilly winters and warm summers, with plenty of rain. A typical July afternoon reaches 87°, a January night drops to 24°, and about 20 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Bryn Athyn feels like
Winter
Spring
Summer
Fall
Bryn Athyn 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° | 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 | 11 | 0 | 49° – 58° |
| May | 73° | 51° | 3.9" | 0 | 11 | 0 | 57° – 68° |
| June | 82° | 61° | 4.3" | 0 | 11 | 0 | 68° – 75° |
| July | 87° | 66° | 4.8" | 0 | 10 | 0 | 72° – 80° |
| August | 85° | 64° | 4.5" | 0 | 9 | 0 | 70° – 79° |
| September | 78° | 57° | 4.4" | 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 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Bryn Athyn
Bryn Athyn gets 48 inches of rain and melted snow a year. July is the wettest month and February the driest. Rain or snow falls on about 120 days a year. Snow covers the ground about 18 days of the year.
About 185 frost-free days a year
In half of years the last 32° night comes by April 21 and the first one by October 25. That leaves about 185 frost-free days for gardens, longer than 58% of U.S. towns.
Heating and cooling a home in Bryn Athyn
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Bryn Athyn, 85% of that work is heating and 15% is cooling, so the furnace matters far more than the air conditioner.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
Bryn Athyn and its neighbors
Bryn Athyn borders 2 towns with climate data. January nights across them vary by 0.6°. Upper Moreland has the coldest January nights (24°) and Lower Moreland the hottest July afternoons (87°). Bryn Athyn’s January low is 24° and its July high 87°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Bryn Athyn compares
Compared with every U.S. town and city on TownTapestry, each counted once.
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°). The shift is larger than in 98% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Bryn Athyn’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. December swings the most: between 1991 and 2020 its average temperature ranged from 29° to 49°. September is the most reliable, staying within 7°.
Common questions about Bryn Athyn’s climate
What is the coldest month in Bryn Athyn?
January, with a typical high of 40° and a low of 24°.
What is the hottest month in Bryn Athyn?
July, with a typical high of 87° and a low of 66°. About 27 days a year reach 90°.
How much snow does Bryn Athyn get?
About 20 inches in a normal winter, most of it in January.
When is the first frost in Bryn Athyn?
In half of years the first 32° night comes by October 25, and the last spring frost by April 21.
What is the rainiest month in Bryn Athyn?
July, with 4.8 inches of rain and melted snow. The year totals 48 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Bryn Athyn itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Neshaminy Falls, PA (6 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.