Sewaren has chilly, snowy winters and warm summers, with plenty of rain
A typical July afternoon reaches 86°, a January night drops to 26°, and about 32 inches of snow falls in a normal winter.
A year in Sewaren at a glance
Each month’s typical high and low, and what it brings.
What stands out about Sewaren’s climate
Read from where Sewaren sits among New Jersey’s towns. The page puts what stands out first.
32 inches of snow, 48 of rain and melt
July is the wettest month and February the driest. Rain or snow falls on about 123 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Living with Sewaren’s climate
What the numbers mean for a garden, a driveway, a furnace and a free afternoon.
222 frost-free days. The last frost comes by Apr 2 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Nov 10.
About 32" a winter over 7 days with an inch or more, most in February. Snow covers the ground about 22 days a year.
Months averaging under 55° run from November through April. Heating is 79% of the year’s heating-and-cooling load.
About 28 days a year reach 90°, and July afternoons average 86°.
The nicest months are April, May, June, September and October. 0.4 miles of trails are waiting.
Parks & trails →Normals are averages. Ice storms, nor’easters, floods and heat waves are on the natural hazards page.
Natural hazards →What a year in Sewaren feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 222 frost-free days a year
In half of years the last 32° night comes by April 2 and the first by November 10.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
Sewaren and its neighbors
Woodbridge has the coldest January nights next door (24°) and Woodbridge the hottest July afternoons (87°). Tap a town to see its climate.
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 Sewaren averaged 2.2° warmer than the 1900s. The biggest change is in December (+3.7°).
A bigger shift than in 97% of U.S. towns.
Change by month
How Sewaren compares
Against every U.S. town on TownTapestry, each counted once, with its place in New Jersey.
Sewaren 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 | 41° | 26° | 3.5" | 9.1" | 11 | 8 | 25° – 40° |
| February | 43° | 27° | 2.9" | 10.1" | 10 | 8 | 23° – 41° |
| March | 51° | 33° | 4.2" | 5.6" | 11 | 3 | 37° – 51° |
| April | 62° | 43° | 3.7" | 0.5" | 12 | 0 | 49° – 57° |
| May | 72° | 53° | 4.0" | 0 | 11 | 0 | 58° – 67° |
| June | 81° | 62° | 4.3" | 0 | 11 | 0 | 68° – 75° |
| July | 86° | 68° | 4.9" | 0 | 10 | 0 | 72° – 81° |
| August | 84° | 66° | 4.5" | 0 | 10 | 0 | 71° – 79° |
| September | 78° | 60° | 4.0" | 0 | 9 | 0 | 66° – 74° |
| October | 66° | 48° | 4.1" | 0.2" | 9 | 0 | 53° – 64° |
| November | 55° | 39° | 3.3" | 0.6" | 9 | 0 | 42° – 52° |
| December | 45° | 31° | 4.3" | 5.4" | 11 | 3 | 31° – 50° |
| Year | 64° | 46° | 47.7" | 31.5" | 123 | 22 |
Heating and cooling a home in Sewaren
79% of the work is heating.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. Source: NOAA station normals.
How much a month can swing
A normal is an average. December swings the most: from 1991 to 2020 its average ranged from 31° to 50°. June is the most reliable, staying within 7°.
Common questions about Sewaren’s climate
What is the coldest month in Sewaren?
January, with a typical high of 41° and a low of 26°.
What is the hottest month in Sewaren?
July, with a typical high of 86° and a low of 68°. About 28 days a year reach 90°.
How much snow does Sewaren get?
About 32 inches in a normal winter, most of it in February.
When is the first frost in Sewaren?
In half of years the first 32° night comes by November 10, and the last spring frost by April 2.
What is the rainiest month in Sewaren?
July, with 4.9 inches of rain and melted snow. The year totals 48 inches.
Neighbors talk weather
Gardens, snow, and the best days of the year in Sewaren.
Your answer becomes a post in Town Square.
Temperatures and rainfall come from NOAA’s gridded climate normals for Sewaren itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Newark Intl Airport, NJ (11 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000. Today’s forecast: National Weather Service.