Glen Rock, PA climate
Glen Rock has chilly winters and warm summers. A typical July afternoon reaches 85°, a January night drops to 21°, and about 29 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Glen Rock feels like
Winter
Spring
Summer
Fall
Glen Rock 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 | 39° | 21° | 3.2" | 9.8" | 11 | 8 | 21° – 38° |
| February | 42° | 23° | 2.7" | 9.4" | 9 | 10 | 21° – 41° |
| March | 51° | 30° | 4.0" | 5.0" | 11 | 5 | 35° – 51° |
| April | 63° | 40° | 3.6" | 0.2" | 12 | 0 | 47° – 57° |
| May | 73° | 50° | 4.0" | 0 | 13 | 0 | 56° – 67° |
| June | 81° | 59° | 4.1" | 0 | 11 | 0 | 66° – 73° |
| July | 85° | 64° | 4.7" | 0 | 10 | 0 | 70° – 78° |
| August | 83° | 62° | 3.9" | 0 | 10 | 0 | 68° – 76° |
| September | 76° | 55° | 4.9" | 0 | 9 | 0 | 63° – 69° |
| October | 65° | 43° | 4.1" | 0 | 9 | 0 | 50° – 61° |
| November | 53° | 34° | 3.2" | 0.6" | 9 | 0 | 37° – 48° |
| December | 43° | 26° | 3.6" | 3.8" | 10 | 4 | 26° – 46° |
| Year | 63° | 42° | 46.0" | 28.8" | 124 | 27 |
“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 Glen Rock
Glen Rock gets 46 inches of rain and melted snow a year. September is the wettest month and February the driest. Rain or snow falls on about 124 days a year. Snow covers the ground about 27 days of the year.
About 188 frost-free days a year
In half of years the last 32° night comes by April 19 and the first one by October 25. That leaves about 188 frost-free days for gardens, longer than 62% of U.S. towns.
Heating and cooling a home in Glen Rock
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Glen Rock, 84% of that work is heating and 16% 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.
How Glen Rock 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 Glen Rock averaged 1.7° warmer than the 1900s. The biggest change is in December (+3.0°). The shift is larger than in 83% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Glen Rock’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 26° to 46°. September is the most reliable, staying within 7°.
Common questions about Glen Rock’s climate
What is the coldest month in Glen Rock?
January, with a typical high of 39° and a low of 21°.
What is the hottest month in Glen Rock?
July, with a typical high of 85° and a low of 64°. About 12 days a year reach 90°.
How much snow does Glen Rock get?
About 29 inches in a normal winter, most of it in January.
When is the first frost in Glen Rock?
In half of years the first 32° night comes by October 25, and the last spring frost by April 19.
What is the rainiest month in Glen Rock?
September, with 4.9 inches of rain and melted snow. The year totals 46 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Glen Rock itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Spring Grove, PA (9 mi, snow) and Millers 4 Ne, MD (6 mi, frost, heat and degree days). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.