Glen Rock, NJ climate
Glen Rock has chilly winters and warm summers, with plenty of rain. A typical July afternoon reaches 86°, a January night drops to 22°, and about 24 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 | 38° | 22° | 3.4" | 5.8" | 10 | 8 | 21° – 37° |
| February | 41° | 23° | 2.8" | 8.4" | 8 | 8 | 20° – 38° |
| March | 49° | 30° | 4.0" | 4.6" | 10 | 5 | 34° – 49° |
| April | 62° | 40° | 4.0" | 0.4" | 12 | 0 | 47° – 56° |
| May | 72° | 50° | 4.0" | 0 | 12 | 0 | 57° – 66° |
| June | 81° | 59° | 4.6" | 0 | 11 | 0 | 67° – 73° |
| July | 86° | 65° | 4.6" | 0 | 11 | 0 | 71° – 79° |
| August | 84° | 63° | 4.7" | 0 | 11 | 0 | 69° – 77° |
| September | 77° | 56° | 4.4" | 0 | 10 | 0 | 64° – 71° |
| October | 65° | 44° | 4.5" | 0 | 11 | 0 | 50° – 61° |
| November | 53° | 35° | 3.7" | 0.7" | 9 | 0 | 40° – 49° |
| December | 43° | 27° | 4.3" | 4.1" | 10 | 4 | 28° – 47° |
| Year | 63° | 43° | 48.7" | 24.0" | 123 | 24 |
“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 49 inches of rain and melted snow a year. August is the wettest month and February the driest. Rain or snow falls on about 123 days a year. Snow covers the ground about 24 days of the year.
About 195 frost-free days a year
In half of years the last 32° night comes by April 15 and the first one by October 28. That leaves about 195 frost-free days for gardens, longer than 69% 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.
Glen Rock and its neighbors
Glen Rock borders 3 towns with climate data. January nights across them vary by 0.8°. Ridgewood has the coldest January nights (22°) and Fair Lawn the hottest July afternoons (86°). Glen Rock’s January low is 22° and its July high 86°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
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 2.2° warmer than the 1900s. The biggest change is in December (+3.5°). The shift is larger than in 97% 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. February swings the most: between 1991 and 2020 its average temperature ranged from 20° to 38°. June is the most reliable, staying within 6°.
Common questions about Glen Rock’s climate
What is the coldest month in Glen Rock?
January, with a typical high of 38° and a low of 22°.
What is the hottest month in Glen Rock?
July, with a typical high of 86° and a low of 65°. About 22 days a year reach 90°.
How much snow does Glen Rock get?
About 24 inches in a normal winter, most of it in February.
When is the first frost in Glen Rock?
In half of years the first 32° night comes by October 28, and the last spring frost by April 15.
What is the rainiest month in Glen Rock?
August, with 4.7 inches of rain and melted snow. The year totals 49 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 Canoe Brook, NJ (19 mi, snow) and Little Falls, NJ (7 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.