Harrison, New Jersey climate: Normal weather by month, frost dates and records
Harrison's normal year runs from 25°F January nights to 87°F July afternoons, with 50.4 inches of precipitation and 28 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 12.7°C, January lows of −4°C, July highs of 30°C, 1,281 mm of precipitation a year.
- NOAA stationHarrison
- Station IDUSC00283704
- Location40.75°N 74.15°W
- Elevation24 ft (7 m)
- From the centerunder 1 mile
- Population22,182
On October 22, the normal high in Harrison is 63°F and the normal low 45°F, and the chance of measurable rain or snow is 29%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Harrison.
- Jan 39° 25°
- Feb 42° 26°
- Mar 50° 33°
- Apr 62° 43°
- May 72° 54°
- Jun 82° 63°
- Jul 87° 69°
- Aug 85° 67°
- Sep 78° 60°
- Oct 66° 48°
- Nov 54° 38°
- Dec 44° 31°
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 Harrison each month?
July is the warmest month, with normal highs of 87°F; January the coldest, with normal lows of 25°F. The most precipitation falls in June (4.87 in), the least in February (3.26 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 39°F | 25°F | 32.1°F | 3.66 | 8.0 | 11 | <1 | 23 | 9 h 30 min |
| February | 42°F | 26°F | 34.2°F | 3.26 | 8.4 | 10 | <1 | 21 | 10 h 40 min |
| March | 50°F | 33°F | 41.3°F | 4.30 | 4.7 | 11 | <1 | 14 | 11 h 50 min |
| April | 62°F | 43°F | 52.4°F | 4.07 | 0.7 | 11 | <1 | 2 | 13 h 20 min |
| May | 72°F | 54°F | 62.8°F | 4.36 | 0.0 | 12 | 2 | <1 | 14 h 30 min |
| June | 82°F | 63°F | 72.4°F | 4.87 | 0.0 | 11 | 5 | <1 | 15 h |
| July | 87°F | 69°F | 77.9°F | 4.81 | 0.0 | 9 | 12 | <1 | 14 h 50 min |
| August | 85°F | 67°F | 75.8°F | 4.38 | 0.0 | 10 | 9 | <1 | 13 h 50 min |
| September | 78°F | 60°F | 68.8°F | 4.33 | 0.0 | 8 | 2 | <1 | 12 h 30 min |
| October | 66°F | 48°F | 56.6°F | 4.15 | 0.2 | 9 | <1 | <1 | 11 h 10 min |
| November | 54°F | 38°F | 46.1°F | 3.65 | 0.3 | 9 | <1 | 5 | 10 h |
| December | 44°F | 31°F | 37.3°F | 4.58 | 5.9 | 11 | <1 | 18 | 9 h 20 min |
| Year (annual) | 63°F | 46°F | 54.8°F | 50.42 | 28.2 | 120 | 31 | 83 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 4°C | −4°C | 0.1°C | 93 mm | 20 cm |
| February | 6°C | −3°C | 1.2°C | 83 mm | 21 cm |
| March | 10°C | 0°C | 5.2°C | 109 mm | 12 cm |
| April | 17°C | 6°C | 11.3°C | 103 mm | 2 cm |
| May | 22°C | 12°C | 17.1°C | 111 mm | 0 cm |
| June | 28°C | 17°C | 22.4°C | 124 mm | 0 cm |
| July | 30°C | 21°C | 25.5°C | 122 mm | 0 cm |
| August | 29°C | 19°C | 24.3°C | 111 mm | 0 cm |
| September | 25°C | 16°C | 20.4°C | 110 mm | 0 cm |
| October | 19°C | 9°C | 13.7°C | 105 mm | 1 cm |
| November | 12°C | 3°C | 7.8°C | 93 mm | 1 cm |
| December | 7°C | −1°C | 2.9°C | 116 mm | 15 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00283704; 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 Harrison?
Normal highs sit between 65°F and 85°F in May, June, August, September and October. Of those, September has the fewest days with rain (8).
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 USC00283704.
When is the last frost in Harrison?
In Harrison, the last spring frost (32°F) comes after April 4 in half of years and after April 16 in one year in ten; the first autumn frost comes before November 6 in half of years and before October 25 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 41 year in 10 after April 16; 9 in 10 after March 23
- First autumn frost, half of years before
- November 61 year in 10 before October 25; 9 in 10 before November 22
NOAA puts the median frost-free season at 216 days, and the season without a hard freeze (28°F) at 238 days.
A hard freeze (28°F) comes after March 26 in half of springs and before November 19 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Harrison in zone 7b in ZIP code 07029. By the map's own method, the average of each year's coldest night over 1991-2020, Harrison's NOAA station is in zone 7b: the coldest night of a typical year reaches 7°F (16 complete years).
Frost dates for every NOAA station in New Jersey · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00283704; 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 Harrison?
In a normal year in Harrison, 31 days a year reach 90°F (2 of them 100°F or more), 83 nights fall to 32°F or colder and 120 days bring measurable precipitation.
- Days at 90°F or more
- 31a normal year
- Days at 100°F or more
- 2a normal year
- Nights at 32°F or colder
- 83a normal year
- Days that stay below freezing
- 15high of 32°F or less
- Days with 0.01 inch of precipitation
- 120a normal year
- Days with 1 inch of snow or more
- 7a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00283704.
How sunny is Harrison?
Over a year 73% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Harrison, 3.9 kWh per square metre a day. July is the sunniest month (80%) and December the cloudiest (66%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 68% | 1.9 |
| February | 71% | 2.8 |
| March | 69% | 3.7 |
| April | 71% | 4.8 |
| May | 70% | 5.4 |
| June | 76% | 6.0 |
| July | 80% | 6.0 |
| August | 78% | 5.2 |
| September | 76% | 4.3 |
| October | 71% | 3.0 |
| November | 72% | 2.2 |
| December | 66% | 1.6 |
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 Harrison need?
A normal year in Harrison brings 4,896 heating degree days, 9% fewer than the median U.S. place (5,373), and 1,219 cooling degree days, 34% 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 3,759 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,018 | 0 |
| February | 862 | 0 |
| March | 735 | 0 |
| April | 389 | 12 |
| May | 134 | 66 |
| June | 14 | 236 |
| July | 0 | 398 |
| August | 2 | 336 |
| September | 38 | 152 |
| October | 277 | 18 |
| November | 567 | 0 |
| December | 860 | 0 |
| Year (annual) | 4,896 | 1,219 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00283704. 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.
Has Harrison been warmer than normal lately?
2025 averaged 55.3°F, 0.5°F above the 1991-2020 normal of 54.8°F. 5 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 56.2°F | +1.4°F | 64.34 | 31.5 |
| 2022 | 55.7°F | +0.9°F | 48.65 | 18.3 |
| 2023 | 56.9°F | +2.1°F | 62.29 | 3.6 |
| 2024 | 57.1°F | +2.3°F | 53.96 | 16.4 |
| 2025 | 55.3°F | +0.5°F | 44.31 | 19.0 |
Source: observed years: ACIS, station USC00283704. A year counts only with all twelve months complete.
How does Harrison's climate compare?
Harrison is warmer than 22 of the other 32 places with their own NOAA record in New Jersey, and wetter than 24. Across the 7,247 U.S. stations with normals, its annual mean of 54.8°F is warmer than 59%.
In the Köppen classification computed from these normals, Harrison 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 Harrison share this climate record?
2 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.
- East Orange, NJalso near: Essex Fells (6 mi, 52.5°F a year); Newark (6 mi, 55.5°F a year)71,850 people · 3 mi W
- East Newark, NJ2,539 people · 1 mi NW
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 Harrison's climate
What is the coldest month in Harrison?
January, with a normal high of 39°F and a normal low of 25°F. The warmest is July (87°F by day, 69°F at night).
Does it snow in Harrison?
Yes: 28 inches in a normal year, falling on 12 days with 0.1 inch or more, the most in February (8.4 inches).
What is the rainiest month in Harrison?
June, with 4.87 in of precipitation in a normal year; the driest is February with 3.26 in.
What plant hardiness zone is Harrison in?
The USDA's 2023 map puts Harrison in zone 7b in ZIP code 07029. By the same method at Harrison's NOAA station, the coldest night of a typical year reaches 7°F (16 years, 1991-2020): zone 7b.
How late can frost come in Harrison?
In half of years the last 32°F night comes after April 4; in one year in ten it comes after April 16. Waiting until April 16 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
- Newark, NJ4 miles from this station, 55.5°F a year
- Teterboro, NJ9 miles from this station, 55.4°F a year
- Essex Fells, NJ9 miles from this station, 52.5°F a year
- New York, NY10 miles from this station, 55.8°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made