Philadelphia/Mount Holly Weather Office, New Jersey climate: Climate normals at a NOAA weather station

What is the weather like at Philadelphia/Mount Holly Weather Office each month?

July is the warmest month, with normal highs of 85°F; January the coldest, with normal lows of 23°F. The most precipitation falls in July (5.10 in), the least in February (2.71 in).

Which months are mildest at Philadelphia/Mount Holly Weather Office?

Normal highs sit between 65°F and 85°F in May, June, August and September. Of those, September has the fewest days with rain (9).

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.

When is the last frost at Philadelphia/Mount Holly Weather Office?

In Philadelphia/Mount Holly Weather Office, the last spring frost (32°F) comes after April 15 in half of years and after April 29 in one year in ten; the first autumn frost comes before October 29 in half of years and before October 14 in one year in ten.

Last spring frost, half of years after

April 151 year in 10 after April 29; 9 in 10 after April 1

First autumn frost, half of years before

October 291 year in 10 before October 14; 9 in 10 before November 10

NOAA puts the median frost-free season at 196 days, and the season without a hard freeze (28°F) at 218 days.

A hard freeze (28°F) comes after April 1 in half of springs and before November 7 in half of autumns.

The USDA's 2023 Plant Hardiness Zone Map puts Philadelphia/Mount Holly Weather Office in zone 7b in ZIP code 08060, 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 7a: the coldest night of a typical year reaches 5°F (27 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

How hot and how cold does it get at Philadelphia/Mount Holly Weather Office?

In a normal year in Philadelphia/Mount Holly Weather Office, 22 days a year reach 90°F (1 of them 100°F or more), 111 nights fall to 32°F or colder and 143 days bring measurable precipitation.

Days at 90°F or more

22a normal year

Days at 100°F or more

1a normal year

Nights at 32°F or colder

111a normal year

Days that stay below freezing

17high of 32°F or less

Days with 0.01 inch of precipitation

143a normal year

Days with 1 inch of snow or more

7a normal year

The highest temperature in this station's record (since 1993) is 103°F, on July 7, 2010; the lowest is −6°F, on January 20, 1994.

The wettest calendar year on that record is 1996, with 63.24 in; the snowiest season is 2009–10, with 69.7 inches.

How sunny is it at Philadelphia/Mount Holly Weather Office?

Over a year 73% of the sunlight that would reach the ground under clear skies gets through the clouds at Philadelphia/Mount Holly Weather Office, 3.9 kWh per square metre a day. July is the sunniest month (80%) and December the cloudiest (66%).

How many heating and cooling degree days does Philadelphia/Mount Holly Weather Office record?

A normal year at Philadelphia/Mount Holly Weather Office brings 5,279 heating degree days, 2% fewer than the median U.S. place (5,373), and 975 cooling degree days, 7% more than the median (908). Seven months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 3,390 growing degree days a year above 50°F.

Have recent years at Philadelphia/Mount Holly Weather Office been warmer than normal?

2025 averaged 54.0°F, 0.9°F above the 1991-2020 normal of 53.1°F. 5 of the 5 complete years since 2021 ran warmer than the normal.

Over 32 complete years from 1994 to 2025, the station's annual mean temperature rose at a fitted 6.5°F per century (+0.36°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.

Which places near Philadelphia/Mount Holly Weather Office share this climate record?

12 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.

• Bristol, PA9,982 people · 6 mi N
• Croydon, PA9,704 people · 7 mi NW
• Browns Mills, NJ9,561 people · 13 mi E
• Fort Dix, NJ8,034 people · 11 mi E
• Country Lake Estates, NJ4,700 people · 15 mi E
• Pemberton Heights, NJ2,643 people · 8 mi SE
• Tullytown, PA2,258 people · 9 mi N
• Eddington, PA1,714 people · 8 mi NW
• Pemberton, NJ1,392 people · 8 mi E
• Cornwells Heights, PA1,279 people · 8 mi NW
• Hulmeville, PA988 people · 10 mi NW
• Juliustown, NJ207 people · 8 mi E

Nearby and next

• New Jersey climateThe statewide normals and every place in the state
• Mount Holly S Jersey Airport, NJ4 miles from this station, 54.5°F a year
• Moorestown-Lenola, NJ9 miles from this station, 55.8°F a year
• Philadelphia NE Airport, PA11 miles from this station, 56.4°F a year
• Pennsauken (1 mi N), NJ11 miles from this station, 54.8°F a year
• Compare two placesMonth by month, side by side

Download these normals (CSV) · JSON · How these figures are made