Philadelphia, Pennsylvania climate: Normal weather by month, frost dates and records

What is the weather like in Philadelphia each month?

July is the warmest month, with normal highs of 88°F; January the coldest, with normal lows of 26°F. The most precipitation falls in September (4.40 in), the least in February (2.75 in).

Each month has its own page with the day-by-day normals, the month's records and its recent years:

• Jan
• Feb
• Mar
• Apr
• May
• Jun
• Jul
• Aug
• Sep
• Oct
• Nov
• Dec

When is the best weather to visit Philadelphia?

Normal highs sit between 65°F and 85°F in May, June, September and October. Of those, October 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 in Philadelphia?

In Philadelphia, the last spring frost (32°F) comes after April 2 in half of years and after April 13 in one year in ten; the first autumn frost comes before November 10 in half of years and before October 30 in one year in ten.

Last spring frost, half of years after

April 21 year in 10 after April 13; 9 in 10 after March 19

First autumn frost, half of years before

November 101 year in 10 before October 30; 9 in 10 before November 24

NOAA puts the median frost-free season at 224 days, and the season without a hard freeze (28°F) at 246 days.

A hard freeze (28°F) comes after March 22 in half of springs and before November 23 in half of autumns.

The USDA's 2023 Plant Hardiness Zone Map puts Philadelphia in zone 7b across its 46 ZIP code areas (7b in 19153, the largest). By the map's own method, the average of each year's coldest night over 1991-2020, Philadelphia's NOAA station is in zone 7b: the coldest night of a typical year reaches 9°F (30 complete years).

Frost dates for every NOAA station in Pennsylvania · Frost dates by ZIP code

What hardiness zone is each Philadelphia ZIP code in?

The USDA's 2023 map gives each ZIP code area one zone. Philadelphia's 46 ZIP code areas are all in zone 7b. Each ZIP's frost dates are in the frost tool.

How hot and how cold does it get in Philadelphia?

In a normal year in Philadelphia, 30 days a year reach 90°F (1 of them 100°F or more), 77 nights fall to 32°F or colder and 121 days bring measurable precipitation.

Days at 90°F or more

30a normal year

Days at 100°F or more

1a normal year

Nights at 32°F or colder

77a normal year

Days that stay below freezing

13high of 32°F or less

Days with 0.01 inch of precipitation

121a normal year

Days with 1 inch of snow or more

5a normal year

The highest temperature in Philadelphia's official record (kept by the National Weather Service since 1873) is 106°F, on August 7, 1918; the lowest is −11°F, on February 9, 1934.

The wettest calendar year on that record is 2011, with 64.33 in; the snowiest season is 2009–10, with 78.7 inches.

How humid and windy is Philadelphia, and how clear are its skies?

The summer (June-August) dew point averages 64°F. The muggiest month is July, with an average dew point of 65°F, above the 65°F at which most people call the air sticky; the driest air comes in January (21°F). February is the windiest month (10.8 mph on average), and September has the most clear or nearly clear hours (42%).

How sunny is Philadelphia?

Over a year 75% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Philadelphia, 4.1 kWh per square metre a day. July is the sunniest month (82%) and December the cloudiest (68%). Among the 459 U.S. places of 50,000 or more, that ranks tied 304th (with 25 others) in sunshine.

How much heating and cooling does Philadelphia need?

A normal year in Philadelphia brings 4,510 heating degree days, 16% fewer than the median U.S. place (5,373), and 1,358 cooling degree days, 50% 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 4,047 growing degree days a year above 50°F.

Has Philadelphia been warmer than normal lately?

2025 averaged 57.2°F, 0.9°F above the 1991-2020 normal of 56.3°F. 5 of the 5 complete years since 2021 ran warmer than the normal.

Over 83 complete years from 1941 to 2025, the station's annual mean temperature rose at a fitted 4.1°F per century (+0.23°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.

Which places near Philadelphia share this climate record?

38 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.

• Lindenwold, NJ21,919 people · 13 mi E
• Bellmawr, NJ11,846 people · 7 mi E
• Pine Hill, NJ10,894 people · 14 mi SE
• Woodbury, NJ10,138 people · 5 mi SE
• Collingdale, PA8,956 people · 4 mi NW
• Pitman, NJ8,943 people · 11 mi SE
• Runnemede, NJ8,425 people · 8 mi E
• Berlin, NJ7,614 people · 16 mi E
• Glenolden, PA7,266 people · 4 mi NW
• Stratford, NJ7,185 people · 12 mi E
• Folcroft, PA6,827 people · 3 mi NW
• Prospect Park, PA6,452 people · 4 mi W
• Paulsboro, NJ6,316 people · 2 mi S
• Sharon Hill, PA6,039 people · 3 mi NW
• Norwood, PA5,969 people · 4 mi W
• Clementon, NJ5,600 people · 14 mi E
• Glendora, NJ5,367 people · 9 mi E
• Blackwood, NJ4,615 people · 10 mi SE
• Mullica Hill, NJ4,561 people · 10 mi S
• Oak Valley, NJ4,374 people · 6 mi SE
• Westville, NJ4,350 people · 5 mi E
• Aldan, PA4,277 people · 5 mi NW
• Gibbstown, NJ3,494 people · 4 mi SW
• Richwood, NJ3,453 people · 11 mi S
• Woodbury Heights, NJ3,155 people · 6 mi SE
• National Park, NJ3,085 people · 2 mi E
• Turnersville, NJ3,071 people · 11 mi SE
• Sewell, NJ3,065 people · 8 mi SE
• West Berlin, NJ2,533 people · 16 mi E
• Colwyn, PA2,483 people · 3 mi N
• Thorofare, NJ2,419 people · 2 mi SE
• Wenonah, NJ2,328 people · 7 mi SE
• Laurel Springs, NJ2,003 people · 12 mi E
• Brooklawn, NJ1,831 people · 6 mi E
• Mickleton, NJ1,734 people · 5 mi S
• Mount Royal, NJ1,077 people · 4 mi S
• Hi-Nella, NJ938 people · 11 mi E
• Grenloch, NJ748 people · 11 mi SE

What do Philadelphia's other NOAA stations record?

One more NOAA station keeps 1991-2020 normals in or near Philadelphia. This page uses Philadelphia International Airport; the other differs by site and elevation, and the linked ones have pages of their own:

Nearby and next

• Philadelphia in OctoberThis month day by day, its records and recent years
• Pennsylvania climateThe statewide normals and every place in the state
• Phila Franklin Inst, PA7 miles from this station, 57.7°F a year
• Marcus Hook, PA11 miles from this station, 57.1°F a year
• Glassboro, NJ12 miles from this station, 54.9°F a year
• Pennsauken (1 mi N), NJ13 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