Greenwich, NJ climate
Greenwich has chilly winters and warm summers. A typical July afternoon reaches 88°, a January night drops to 26°, and about 23 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Greenwich feels like
Winter
Spring
Summer
Fall
Greenwich 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 | 42° | 26° | 3.3" | 7.1" | 11 | 5 | 26° – 41° |
| February | 44° | 27° | 2.8" | 8.4" | 10 | 6 | 25° – 44° |
| March | 53° | 34° | 4.1" | 3.6" | 11 | 2 | 38° – 52° |
| April | 65° | 44° | 3.7" | 0.3" | 11 | 0 | 51° – 59° |
| May | 74° | 54° | 3.5" | 0 | 11 | 0 | 59° – 69° |
| June | 83° | 63° | 4.3" | 0 | 10 | 0 | 70° – 78° |
| July | 88° | 69° | 4.6" | 0 | 10 | 0 | 74° – 82° |
| August | 86° | 67° | 4.4" | 0 | 9 | 0 | 72° – 80° |
| September | 79° | 60° | 4.6" | 0 | 9 | 0 | 66° – 73° |
| October | 67° | 48° | 3.8" | 0 | 9 | 0 | 53° – 64° |
| November | 56° | 39° | 3.2" | 0.2" | 9 | 0 | 41° – 52° |
| December | 46° | 31° | 4.0" | 3.5" | 11 | 3 | 31° – 51° |
| Year | 65° | 47° | 46.2" | 23.1" | 121 | 16 |
“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 Greenwich
Greenwich 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 121 days a year. Snow covers the ground about 16 days of the year.
About 224 frost-free days a year
In half of years the last 32° night comes by April 2 and the first one by November 10. That leaves about 224 frost-free days for gardens, longer than 84% of U.S. towns.
Heating and cooling a home in Greenwich
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Greenwich, 77% of that work is heating and 23% is cooling.
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.
Greenwich and its neighbors
Greenwich borders 6 towns with climate data. January nights across them vary by 0.6°. Eddystone has the coldest January nights (26°) and Tinicum the hottest July afternoons (88°). Greenwich’s January low is 26° and its July high 88°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Greenwich 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 Greenwich averaged 1.9° warmer than the 1900s. The biggest change is in December (+3.5°). The shift is larger than in 92% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Greenwich’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 31° to 51°. September is the most reliable, staying within 8°.
Common questions about Greenwich’s climate
What is the coldest month in Greenwich?
January, with a typical high of 42° and a low of 26°.
What is the hottest month in Greenwich?
July, with a typical high of 88° and a low of 69°. About 30 days a year reach 90°.
How much snow does Greenwich get?
About 23 inches in a normal winter, most of it in February.
When is the first frost in Greenwich?
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 Greenwich?
September, with 4.6 inches of rain and melted snow. The year totals 46 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Greenwich itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Philadelphia Intl Airport, PA (4 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.