Weather without surprises: Sweetwater keeps close to the norm for U.S. towns
The coldest hours of a January night bottom out at 25° on average. By precipitation alone, it ranks wetter than 72% of U.S. towns. Since 1901–2000, the year has warmed by 2.1°, most of all in December. Keep the boiler serviced for the months from November to March, which average under 50°.
A year in Sweetwater at a glance
Each month’s typical high and low, and what it brings.
What stands out about Sweetwater’s climate
Compared with towns across the U.S., with Sweetwater’s place in New Jersey beside it.
What a year in Sweetwater feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 196 frost-free days a year
In half of years the last 32° night comes by April 14 and the first by October 27. Frost and day counts come from NOAA’s station at Hammonton 1 Ne, NJ, 9 miles from the town’s center, 110 ft higher.
The 2023 USDA map puts Sweetwater’s center in zone 7a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 4°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
About 17 inches of snow a winter
Snow, measured at Atlantic City International Airport, is heaviest from January through February, about 6 inches a month. Precipitation (rain plus melted snow) adds up to 47 inches a year; July is the wettest month and February the driest. Rain or snow falls on about 120 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Sweetwater
81% of the work is heating. Months averaging under 55° run from November through April.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Hammonton 1 Ne, NJ.
Living with Sweetwater’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
196 frost-free days in zone 7a. The last frost comes by Apr 14 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Oct 27.
Months with highs of 62–84° and lows of 40° or more: April, May, June, September and October. 0.4 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Sweetwater from natural hazards, river flooding is the largest share (35%); heat waves, cold waves, winter storms and ice storms together are 8%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Sweetwater and its neighbors
Every town next door is within a degree of Sweetwater in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Sweetwater’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| Sweetwater, NJ | 25° | 87° | 47" | 17" |
| Cynthiana, KY | 24° | 87° | 48" | 16" |
| Milford, OH | 23° | 87° | 45" | 16" |
| Cave Spring, VA | 27° | 87° | 45" | 18" |
| Scottsburg, IN | 23° | 87° | 48" | 12" |
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 Sweetwater averaged 2.1° warmer than the 1900s. The biggest change is in December (+3.5°).
A bigger shift than in 92% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How Sweetwater compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Sweetwater’s place among New Jersey’s.
Sweetwater weather by month
Highs, lows and precipitation from NOAA’s grid at Sweetwater’s center; snow, wet days and snow on the ground from Atlantic City International Airport. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 43° | 25° | 3.6" | 5.7" | 11 | 4 | 27° – 41° |
| February | 46° | 26° | 3.1" | 5.9" | 10 | 4 | 25° – 43° |
| March | 53° | 32° | 4.6" | 2.2" | 11 | 1 | 37° – 51° |
| April | 64° | 41° | 3.5" | 0.3" | 11 | 0 | 49° – 57° |
| May | 73° | 51° | 3.4" | 0.0" | 11 | 0 | 57° – 68° |
| June | 82° | 61° | 3.9" | 0.0" | 10 | 0 | 67° – 76° |
| July | 87° | 66° | 4.8" | 0.0" | 10 | 0 | 72° – 80° |
| August | 85° | 64° | 4.7" | 0.0" | 9 | 0 | 71° – 78° |
| September | 78° | 58° | 3.8" | 0.0" | 9 | 0 | 65° – 72° |
| October | 67° | 46° | 4.1" | 0.0" | 9 | 0 | 52° – 63° |
| November | 57° | 36° | 3.4" | 0.1" | 9 | 0 | 40° – 51° |
| December | 47° | 29° | 4.5" | 3.2" | 11 | 1 | 30° – 50° |
| Year | 65° | 45° | 47.3" | 17.4" | 120 | 10 |
How much a month can swing
A normal is an average. December swings the most: from 1991 to 2020 its average ranged from 30° to 50°. August is the most reliable, staying within 8°.
Where Sweetwater’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at Sweetwater’s center.
- Snow: Atlantic City International Airport.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Hammonton 1 Ne, NJ, 9 miles from the town’s center, 110 ft higher; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Sweetwater’s climate
What is the weather like in Sweetwater?
A typical July afternoon reaches 87°, a January night drops to 25°, and about 17 inches of snow falls in a normal winter. Milder January nights than 62% of U.S. towns; hotter July afternoons than 60% of U.S. towns.
How cold does it get in Sweetwater in winter?
January nights average 25°. About 105 nights a year reach 32° or below. In the coldest January of the last 30 years the month averaged 27°.
How much snow does Sweetwater get?
About 17 inches in a normal winter at Atlantic City International Airport, heaviest from January through February, about 6 inches a month, with snow on the ground about 10 days a year.
How hot does it get in Sweetwater?
July, with a typical high of 87° and a low of 66°. About 28 days a year reach 90° (Hammonton 1 Ne, NJ).
When is the first and last frost in Sweetwater?
In half of years the last spring frost (32°) comes by April 14 and the first fall frost by October 27, about 196 frost-free days, at Hammonton 1 Ne, NJ.
What growing zone is Sweetwater in?
Zone 7a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 4°.
What is the best time of year to visit Sweetwater?
By one simple rule (highs of 62–84° and lows of 40° or more), April, May, June, September and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Sweetwater getting warmer?
Yes: 1991–2020 averaged 2.1° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 92% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Sweetwater.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.