Pennington, NJ climate
Pennington has chilly winters and warm summers, with plenty of rain. A typical July afternoon reaches 86°, a January night drops to 23°, and about 27 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Pennington feels like
Winter
Spring
Summer
Fall
Pennington 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 | 30-yr range |
|---|---|---|---|---|---|---|
| January | 40° | 23° | 3.5" | 8.2" | 11 | 24° – 39° |
| February | 43° | 24° | 2.7" | 8.7" | 11 | 22° – 40° |
| March | 51° | 31° | 4.2" | 4.0" | 11 | 36° – 51° |
| April | 63° | 40° | 3.7" | 0.5" | 12 | 48° – 56° |
| May | 73° | 50° | 4.0" | 0 | 14 | 57° – 67° |
| June | 82° | 60° | 4.4" | 0 | 12 | 67° – 74° |
| July | 86° | 65° | 5.1" | 0 | 11 | 71° – 79° |
| August | 85° | 63° | 4.3" | 0 | 11 | 70° – 77° |
| September | 78° | 56° | 4.3" | 0 | 8 | 64° – 71° |
| October | 66° | 45° | 4.2" | 0.1" | 10 | 50° – 62° |
| November | 55° | 35° | 3.4" | 0.5" | 8 | 40° – 50° |
| December | 45° | 28° | 4.3" | 4.6" | 11 | 29° – 48° |
| Year | 64° | 43° | 48.2" | 26.6" | 130 |
“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 Pennington
Pennington 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 130 days a year.
About 192 frost-free days a year
In half of years the last 32° night comes by April 17 and the first one by October 28. That leaves about 192 frost-free days for gardens, longer than 66% of U.S. towns.
Heating and cooling a home in Pennington
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Pennington, 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 Pennington 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 Pennington averaged 2.2° warmer than the 1900s. The biggest change is in December (+3.9°). The shift is larger than in 98% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Pennington’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 48°. September is the most reliable, staying within 7°.
Common questions about Pennington’s climate
What is the coldest month in Pennington?
January, with a typical high of 40° and a low of 23°.
What is the hottest month in Pennington?
July, with a typical high of 86° and a low of 65°. About 24 days a year reach 90°.
How much snow does Pennington get?
About 27 inches in a normal winter, most of it in February.
When is the first frost in Pennington?
In half of years the first 32° night comes by October 28, and the last spring frost by April 17.
What is the rainiest month in Pennington?
July, with 5.1 inches of rain and melted snow. The year totals 48 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Pennington itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Ewing Twp 0.8 Ese, NJ (4 mi, snow) and Trenton State College, NJ (4 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.