Hammonton, New Jersey climate: Normal weather by month, frost dates and records
Hammonton's normal year runs from 24°F January nights to 87°F July afternoons, with 47.5 inches of precipitation and 19 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 12.6°C, January lows of −5°C, July highs of 31°C, 1,207 mm of precipitation a year.
- NOAA stationHammonton (1 mi NE)
- Station IDUSC00283662
- Location39.64°N 74.80°W
- Elevation125 ft (38 m)
- Population15,036
On October 22, the normal high in Hammonton is 65°F and the normal low 43°F, and the chance of measurable rain or snow is 35%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Hammonton.
- Jan 42° 24°
- Feb 45° 25°
- Mar 52° 31°
- Apr 64° 41°
- May 73° 51°
- Jun 82° 61°
- Jul 87° 67°
- Aug 85° 64°
- Sep 79° 57°
- Oct 67° 45°
- Nov 56° 35°
- Dec 47° 29°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Hammonton each month?
July is the warmest month, with normal highs of 87°F; January the coldest, with normal lows of 24°F. The most precipitation falls in August (4.69 in), the least in February (2.85 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 42°F | 24°F | 32.8°F | 3.49 | 5.7 | 11 | <1 | 25 | 9 h 40 min |
| February | 45°F | 25°F | 34.9°F | 2.85 | 6.4 | 10 | <1 | 23 | 10 h 40 min |
| March | 52°F | 31°F | 41.5°F | 4.31 | 2.9 | 11 | <1 | 18 | 11 h 50 min |
| April | 64°F | 41°F | 52.3°F | 3.71 | 0.1 | 12 | <1 | 4 | 13 h 10 min |
| May | 73°F | 51°F | 62.1°F | 3.54 | 0.0 | 12 | 2 | <1 | 14 h 20 min |
| June | 82°F | 61°F | 71.6°F | 4.07 | 0.0 | 12 | 6 | <1 | 15 h |
| July | 87°F | 67°F | 76.9°F | 4.45 | 0.0 | 12 | 12 | <1 | 14 h 40 min |
| August | 85°F | 64°F | 74.8°F | 4.69 | 0.0 | 11 | 7 | <1 | 13 h 50 min |
| September | 79°F | 57°F | 68.0°F | 4.06 | 0.0 | 10 | 2 | <1 | 12 h 30 min |
| October | 67°F | 45°F | 56.3°F | 4.27 | 0.0 | 12 | <1 | 1 | 11 h 10 min |
| November | 56°F | 35°F | 45.9°F | 3.51 | 0.2 | 9 | <1 | 12 | 10 h |
| December | 47°F | 29°F | 37.7°F | 4.56 | 3.7 | 11 | <1 | 22 | 9 h 20 min |
| Year (annual) | 65°F | 44°F | 54.6°F | 47.51 | 19.0 | 132 | 28 | 105 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 5°C | −5°C | 0.4°C | 89 mm | 14 cm |
| February | 7°C | −4°C | 1.6°C | 72 mm | 16 cm |
| March | 11°C | 0°C | 5.3°C | 109 mm | 7 cm |
| April | 18°C | 5°C | 11.3°C | 94 mm | 0 cm |
| May | 23°C | 11°C | 16.7°C | 90 mm | 0 cm |
| June | 28°C | 16°C | 22.0°C | 103 mm | 0 cm |
| July | 31°C | 19°C | 24.9°C | 113 mm | 0 cm |
| August | 30°C | 18°C | 23.8°C | 119 mm | 0 cm |
| September | 26°C | 14°C | 20.0°C | 103 mm | 0 cm |
| October | 20°C | 7°C | 13.5°C | 108 mm | 0 cm |
| November | 14°C | 2°C | 7.7°C | 89 mm | 1 cm |
| December | 8°C | −2°C | 3.2°C | 116 mm | 9 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00283662; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit Hammonton?
Normal highs sit between 65°F and 85°F in May, June, September and October. Of those, September has the fewest days with rain (10).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00283662.
When is the last frost in Hammonton?
In Hammonton, the last spring frost (32°F) comes after April 14 in half of years and after April 27 in one year in ten; the first autumn frost comes before October 27 in half of years and before October 13 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- April 141 year in 10 after April 27; 9 in 10 after April 1
- First autumn frost, half of years before
- October 271 year in 10 before October 13; 9 in 10 before November 8
NOAA puts the median frost-free season at 196 days, and the season without a hard freeze (28°F) at 217 days.
A hard freeze (28°F) comes after April 2 in half of springs and before November 5 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Hammonton in zone 7a in ZIP code 08037. By the map's own method, the average of each year's coldest night over 1991-2020, Hammonton's NOAA station is in zone 7b: the coldest night of a typical year reaches 6°F (16 complete years); the map interpolates between stations and terrain, so the station and the ZIP area can differ by half a zone.
Frost dates for every NOAA station in New Jersey · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00283662; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
How hot and how cold does it get in Hammonton?
In a normal year in Hammonton, 28 days a year reach 90°F, 105 nights fall to 32°F or colder and 132 days bring measurable precipitation.
- Days at 90°F or more
- 28a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 105a normal year
- Days that stay below freezing
- 12high of 32°F or less
- Days with 0.01 inch of precipitation
- 132a normal year
- Days with 1 inch of snow or more
- 5a normal year
The highest temperature in this station's record (since 1930) is 105°F, on July 5, 1966; the lowest is −13°F, on January 11, 1942.
The wettest calendar year on that record is 2018, with 70.98 in; the snowiest season is 2009–10, with 71.2 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00283662; records: ACIS (NOAA Regional Climate Centers), station USC00283662. Records use complete months only; a month missing more than three days is left out.
How sunny is Hammonton?
Over a year 75% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Hammonton, 4.1 kWh per square metre a day. July is the sunniest month (82%) and January the cloudiest (68%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 68% | 2.0 |
| February | 71% | 2.9 |
| March | 71% | 3.9 |
| April | 73% | 5.0 |
| May | 73% | 5.5 |
| June | 78% | 6.1 |
| July | 82% | 6.2 |
| August | 80% | 5.4 |
| September | 78% | 4.4 |
| October | 72% | 3.1 |
| November | 73% | 2.3 |
| December | 69% | 1.8 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does Hammonton need?
A normal year in Hammonton brings 4,880 heating degree days, 9% fewer than the median U.S. place (5,373), and 1,115 cooling degree days, 23% more than the median (908). Six months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 3,643 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 997 | 0 |
| February | 844 | 0 |
| March | 727 | 0 |
| April | 391 | 12 |
| May | 149 | 60 |
| June | 19 | 219 |
| July | 0 | 369 |
| August | 1 | 304 |
| September | 45 | 133 |
| October | 287 | 19 |
| November | 575 | 1 |
| December | 845 | 0 |
| Year (annual) | 4,880 | 1,115 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00283662. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
How does Hammonton's climate compare?
Hammonton is warmer than 20 of the other 32 places with their own NOAA record in New Jersey, and wetter than 11. Across the 7,247 U.S. stations with normals, its annual mean of 54.6°F is warmer than 59%.
In the Köppen classification computed from these normals, Hammonton is Cfa: temperate, no dry season, hot summer. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near Hammonton share this climate record?
9 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Buena, NJ4,555 people · 11 mi SW
- Folsom, NJ1,840 people · 4 mi SW
- Chesilhurst, NJ1,558 people · 7 mi NW
- Collings Lakes, NJ1,489 people · 6 mi SW
- Victory Lakes, NJ1,403 people · 9 mi W
- Elwood, NJ920 people · 7 mi SE
- Newtonville, NJ915 people · 6 mi SW
- Sweetwater, NJ805 people · 8 mi E
- Nesco, NJ626 people · 6 mi E
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Hammonton's climate
What is the coldest month in Hammonton?
January, with a normal high of 42°F and a normal low of 24°F. The warmest is July (87°F by day, 67°F at night).
Does it snow in Hammonton?
Yes: 19 inches in a normal year, falling on 9 days with 0.1 inch or more, the most in February (6.4 inches).
What is the rainiest month in Hammonton?
August, with 4.69 in of precipitation in a normal year; the driest is February with 2.85 in.
What plant hardiness zone is Hammonton in?
The USDA's 2023 map puts Hammonton in zone 7a in ZIP code 08037. By the same method at Hammonton's NOAA station, the coldest night of a typical year reaches 6°F (16 years, 1991-2020): zone 7b.
How late can frost come in Hammonton?
In half of years the last 32°F night comes after April 14; in one year in ten it comes after April 27. Waiting until April 27 leaves about a one-in-ten chance of a later frost.
Nearby and next
- New Jersey climateThe statewide normals and every place in the state
- Indian Mills (2 mi W), NJ11 miles from this station, 54.1°F a year
- Glassboro, NJ17 miles from this station, 54.9°F a year
- Estell Manor, NJ18 miles from this station, 54.5°F a year
- Atlantic City, NJ19 miles from this station, 55.1°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made