Mount Holly S Jersey Airport, New Jersey climate: Climate normals at a NOAA weather station
Mount Holly S Jersey Airport's normal year runs from 25°F January nights to 87°F July afternoons, with 42.8 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 12.5°C, January lows of −4°C, July highs of 31°C, 1,087 mm of precipitation a year.
- NOAA stationMount Holly S Jersey Airport
- Station IDUSW00093780
- Location39.95°N 74.84°W
- Elevation53 ft (16 m)
On October 23, the normal high in Mount Holly S Jersey Airport is 64°F and the normal low 43°F, and the chance of measurable rain or snow is 33%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Mount Holly S Jersey Airport.
- Jan 41° 25°
- Feb 44° 26°
- Mar 52° 33°
- Apr 64° 42°
- May 73° 51°
- Jun 82° 61°
- Jul 87° 66°
- Aug 85° 64°
- Sep 78° 57°
- Oct 66° 46°
- Nov 56° 36°
- Dec 46° 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 at Mount Holly S Jersey Airport 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 July (5.19 in), the least in February (2.57 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 41°F | 25°F | 32.8°F | 2.97 | 10 | <1 | 24 | 9 h 40 min |
| February | 44°F | 26°F | 34.8°F | 2.57 | 10 | <1 | 22 | 10 h 40 min |
| March | 52°F | 33°F | 42.5°F | 3.83 | 12 | <1 | 15 | 11 h 50 min |
| April | 64°F | 42°F | 52.6°F | 3.37 | 11 | <1 | 3 | 13 h 10 min |
| May | 73°F | 51°F | 62.2°F | 2.95 | 12 | 1 | <1 | 14 h 20 min |
| June | 82°F | 61°F | 71.5°F | 3.73 | 12 | 5 | <1 | 15 h |
| July | 87°F | 66°F | 76.6°F | 5.19 | 11 | 11 | <1 | 14 h 50 min |
| August | 85°F | 64°F | 74.4°F | 4.40 | 11 | 6 | <1 | 13 h 50 min |
| September | 78°F | 57°F | 67.2°F | 3.39 | 11 | 2 | <1 | 12 h 30 min |
| October | 66°F | 46°F | 55.9°F | 3.67 | 11 | <1 | 2 | 11 h 10 min |
| November | 56°F | 36°F | 45.7°F | 2.98 | 9 | <1 | 12 | 10 h |
| December | 46°F | 29°F | 37.4°F | 3.74 | 11 | <1 | 22 | 9 h 20 min |
| Year (annual) | 64°F | 45°F | 54.5°F | 42.79 | 130 | 25 | 99 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 5°C | −4°C | 0.4°C | 75 mm |
| February | 7°C | −4°C | 1.6°C | 65 mm |
| March | 11°C | 0°C | 5.8°C | 97 mm |
| April | 18°C | 5°C | 11.4°C | 86 mm |
| May | 23°C | 11°C | 16.8°C | 75 mm |
| June | 28°C | 16°C | 21.9°C | 95 mm |
| July | 31°C | 19°C | 24.8°C | 132 mm |
| August | 29°C | 18°C | 23.6°C | 112 mm |
| September | 26°C | 14°C | 19.6°C | 86 mm |
| October | 19°C | 8°C | 13.3°C | 93 mm |
| November | 13°C | 2°C | 7.6°C | 76 mm |
| December | 8°C | −2°C | 3.0°C | 95 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Philadelphia/Mount Holly Weather Office (5 miles away), gets 25 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USW00093780; 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.
Which months are mildest at Mount Holly S Jersey Airport?
Normal highs sit between 65°F and 85°F in May, June, August, September and October. Of those, October has the fewest days with rain (11).
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 USW00093780.
When is the last frost at Mount Holly S Jersey Airport?
In Mount Holly S Jersey Airport, the last spring frost (32°F) comes after April 15 in half of years and after May 2 in one year in ten; the first autumn frost comes before October 28 in half of years and before October 12 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 151 year in 10 after May 2; 9 in 10 after March 31
- First autumn frost, half of years before
- October 281 year in 10 before October 12; 9 in 10 before November 9
NOAA puts the median frost-free season at 195 days, and the season without a hard freeze (28°F) at 222 days.
A hard freeze (28°F) comes after April 1 in half of springs and before November 8 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Mount Holly S Jersey Airport in zone 7b in ZIP code 08036, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, the station is in zone 7b: the coldest night of a typical year reaches 5°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 USW00093780; 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 at Mount Holly S Jersey Airport?
In a normal year in Mount Holly S Jersey Airport, 25 days a year reach 90°F, 99 nights fall to 32°F or colder and 130 days bring measurable precipitation.
- Days at 90°F or more
- 25a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 99a normal year
- Days that stay below freezing
- 14high of 32°F or less
- Days with 0.01 inch of precipitation
- 130a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USW00093780.
How sunny is it at Mount Holly S Jersey Airport?
Over a year 75% of the sunlight that would reach the ground under clear skies gets through the clouds at Mount Holly S Jersey Airport, 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 many heating and cooling degree days does Mount Holly S Jersey Airport record?
A normal year at Mount Holly S Jersey Airport brings 4,880 heating degree days, 9% fewer than the median U.S. place (5,373), and 1,074 cooling degree days, 18% 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 3,591 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 998 | 0 |
| February | 844 | 0 |
| March | 700 | 1 |
| April | 386 | 13 |
| May | 147 | 60 |
| June | 18 | 211 |
| July | 0 | 360 |
| August | 2 | 294 |
| September | 53 | 119 |
| October | 298 | 17 |
| November | 578 | 0 |
| December | 857 | 0 |
| Year (annual) | 4,880 | 1,074 |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00093780. 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.
Have recent years at Mount Holly S Jersey Airport been warmer than normal?
2021 averaged 56.7°F, 2.2°F above the 1991-2020 normal of 54.5°F.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 56.7°F | +2.2°F | – |
Source: observed years: ACIS, station USW00093780. A year counts only with all twelve months complete.
How does Mount Holly S Jersey Airport's climate compare?
Mount Holly S Jersey Airport is warmer than 19 of the 33 places with their own NOAA record in New Jersey, and wetter than 1. Across the 7,247 U.S. stations with normals, its annual mean of 54.5°F is warmer than 59%.
In the Köppen classification computed from these normals, Mount Holly S Jersey Airport 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 Mount Holly S Jersey Airport share this climate record?
Vincentown has no NOAA station with 1991-2020 normals of its 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.
- Vincentown, NJ490 people · 5 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 Mount Holly S Jersey Airport's climate
What is the coldest month at Mount Holly S Jersey Airport?
January, with a normal high of 41°F and a normal low of 25°F. The warmest is July (87°F by day, 66°F at night).
Does it snow at Mount Holly S Jersey Airport?
Yes. NOAA publishes no 1991-2020 snowfall normal for the station; the nearest record that keeps one, Philadelphia/Mount Holly Weather Office (5 miles away), records 25 inches of snow in a normal year.
What is the rainiest month at Mount Holly S Jersey Airport?
July, with 5.19 in of precipitation in a normal year; the driest is February with 2.57 in.
What plant hardiness zone is Mount Holly S Jersey Airport in?
The USDA's 2023 map puts Mount Holly S Jersey Airport in zone 7b in ZIP code 08036, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches 5°F (16 years, 1991-2020): zone 7b.
How late can frost come at Mount Holly S Jersey Airport?
In half of years the last 32°F night comes after April 15; in one year in ten it comes after May 2. Waiting until May 2 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
- Philadelphia/Mount Holly Weather Office, NJ4 miles from this station, 53.1°F a year
- Moorestown-Lenola, NJ7 miles from this station, 55.8°F a year
- Pennsauken (1 mi N), NJ9 miles from this station, 54.8°F a year
- Indian Mills (2 mi W), NJ11 miles from this station, 54.1°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made