McKeesport, Pennsylvania climate: Normal weather by month, frost dates and records
McKeesport's normal year runs from 21°F January nights to 85°F July afternoons, with 42.4 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 10.9°C, January lows of −6°C, July highs of 29°C, 1,076 mm of precipitation a year.
- NOAA stationMcKeesport
- Station IDUSC00365573
- Location40.34°N 79.86°W
- Elevation740 ft (226 m)
- From the centerunder 1 mile
- Population17,119
On October 24, the normal high in McKeesport is 62°F and the normal low 39°F, and the chance of measurable rain or snow is 38%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for McKeesport.
- Jan 39° 21°
- Feb 42° 22°
- Mar 51° 29°
- Apr 64° 38°
- May 74° 47°
- Jun 81° 57°
- Jul 85° 61°
- Aug 83° 60°
- Sep 77° 53°
- Oct 65° 42°
- Nov 53° 32°
- Dec 43° 25°
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 McKeesport each month?
July is the warmest month, with normal highs of 85°F; January the coldest, with normal lows of 21°F. The most precipitation falls in June (5.00 in), the least in February (2.54 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 39°F | 21°F | 29.5°F | 3.04 | 15 | <1 | 26 | 9 h 40 min |
| February | 42°F | 22°F | 31.7°F | 2.54 | 12 | <1 | 24 | 10 h 40 min |
| March | 51°F | 29°F | 39.7°F | 3.20 | 13 | <1 | 20 | 11 h 50 min |
| April | 64°F | 38°F | 50.8°F | 3.76 | 14 | <1 | 8 | 13 h 10 min |
| May | 74°F | 47°F | 60.5°F | 3.99 | 15 | 1 | 1 | 14 h 20 min |
| June | 81°F | 57°F | 68.9°F | 5.00 | 14 | 3 | <1 | 15 h |
| July | 85°F | 61°F | 73.0°F | 4.12 | 12 | 6 | <1 | 14 h 50 min |
| August | 83°F | 60°F | 71.8°F | 3.53 | 10 | 4 | <1 | 13 h 50 min |
| September | 77°F | 53°F | 64.9°F | 3.45 | 11 | 1 | <1 | 12 h 30 min |
| October | 65°F | 42°F | 53.4°F | 3.20 | 11 | <1 | 4 | 11 h 10 min |
| November | 53°F | 32°F | 42.4°F | 2.98 | 12 | <1 | 17 | 10 h |
| December | 43°F | 25°F | 33.9°F | 3.55 | 15 | <1 | 24 | 9 h 20 min |
| Year (annual) | 63°F | 41°F | 51.7°F | 42.36 | 153 | 14 | 124 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 4°C | −6°C | −1.4°C | 77 mm |
| February | 5°C | −6°C | −0.2°C | 65 mm |
| March | 11°C | −2°C | 4.3°C | 81 mm |
| April | 18°C | 3°C | 10.4°C | 96 mm |
| May | 23°C | 9°C | 15.8°C | 101 mm |
| June | 27°C | 14°C | 20.5°C | 127 mm |
| July | 29°C | 16°C | 22.8°C | 105 mm |
| August | 29°C | 16°C | 22.1°C | 90 mm |
| September | 25°C | 12°C | 18.3°C | 88 mm |
| October | 18°C | 5°C | 11.9°C | 81 mm |
| November | 12°C | 0°C | 5.8°C | 76 mm |
| December | 6°C | −4°C | 1.1°C | 90 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Murrysville (9 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 USC00365573; 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 McKeesport?
Normal highs sit between 65°F and 85°F in May, June, July, August, September and October. Of those, August 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 USC00365573.
When is the last frost in McKeesport?
In McKeesport, the last spring frost (32°F) comes after May 2 in half of years and after May 20 in one year in ten; the first autumn frost comes before October 20 in half of years and before October 1 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
- May 21 year in 10 after May 20; 9 in 10 after April 17
- First autumn frost, half of years before
- October 201 year in 10 before October 1; 9 in 10 before November 3
NOAA puts the median frost-free season at 170 days, and the season without a hard freeze (28°F) at 194 days.
A hard freeze (28°F) comes after April 20 in half of springs and before November 1 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts McKeesport in zone 6b in ZIP code 15132. By the map's own method, the average of each year's coldest night over 1991-2020, McKeesport's NOAA station is in zone 6b: the coldest night of a typical year reaches −1°F (20 complete years).
Frost dates for every NOAA station in Pennsylvania · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00365573; 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 McKeesport?
In a normal year in McKeesport, 14 days a year reach 90°F, 124 nights fall to 32°F or colder and 153 days bring measurable precipitation.
- Days at 90°F or more
- 14a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 124a normal year
- Days that stay below freezing
- 27high of 32°F or less
- Days with 0.01 inch of precipitation
- 153a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00365573.
How sunny is McKeesport?
Over a year 68% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around McKeesport, 3.7 kWh per square metre a day. August is the sunniest month (76%) and December the cloudiest (51%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 53% | 1.6 |
| February | 58% | 2.4 |
| March | 61% | 3.4 |
| April | 66% | 4.6 |
| May | 69% | 5.3 |
| June | 73% | 5.9 |
| July | 76% | 5.9 |
| August | 76% | 5.3 |
| September | 75% | 4.3 |
| October | 66% | 2.9 |
| November | 65% | 2.0 |
| December | 51% | 1.3 |
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 McKeesport need?
A normal year in McKeesport brings 5,580 heating degree days, 4% more than the median U.S. place (5,373), and 767 cooling degree days, 16% fewer 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 3,104 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,100 | 0 |
| February | 932 | 0 |
| March | 785 | 0 |
| April | 431 | 5 |
| May | 188 | 47 |
| June | 34 | 151 |
| July | 3 | 253 |
| August | 7 | 216 |
| September | 88 | 85 |
| October | 371 | 10 |
| November | 678 | 0 |
| December | 963 | 0 |
| Year (annual) | 5,580 | 767 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00365573. 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 McKeesport's climate compare?
McKeesport is warmer than 69 of the other 107 places with their own NOAA record in Pennsylvania, and wetter than 33. Across the 7,247 U.S. stations with normals, its annual mean of 51.7°F is warmer than 48%.
In the Köppen classification computed from these normals, McKeesport is Dfa: continental, 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 McKeesport share this climate record?
16 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.
- White Oak, PA7,352 people · 3 mi E
- Clairton, PA5,945 people · 3 mi SW
- Glassport, PA4,298 people · 2 mi SW
- Port Vue, PA3,562 people · 1 mi W
- Liberty, PA2,265 people · 1 mi S
- Greenock, PA1,585 people · 3 mi SE
- Versailles, PA1,424 people · 2 mi SE
- Elizabeth, PA1,357 people · 5 mi S
- Lincoln, PA895 people · 3 mi S
- Blaine Hill, PA563 people · 5 mi S
- Herminie, PA421 people · 9 mi SE
- West Elizabeth, PA387 people · 5 mi S
- Industry, PA379 people · 6 mi SE
- Buena Vista, PA314 people · 5 mi SE
- Coulter, PA293 people · 4 mi SE
- Boston, PA142 people · 3 mi SE
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 McKeesport's climate
What is the coldest month in McKeesport?
January, with a normal high of 39°F and a normal low of 21°F. The warmest is July (85°F by day, 61°F at night).
Does it snow in McKeesport?
Yes. NOAA publishes no 1991-2020 snowfall normal for McKeesport's NOAA station; the nearest record that keeps one, Murrysville (9 miles away), records 25 inches of snow in a normal year.
What is the rainiest month in McKeesport?
June, with 5.00 in of precipitation in a normal year; the driest is February with 2.54 in.
What plant hardiness zone is McKeesport in?
The USDA's 2023 map puts McKeesport in zone 6b in ZIP code 15132. By the same method at McKeesport's NOAA station, the coldest night of a typical year reaches −1°F (20 years, 1991-2020): zone 6b.
How late can frost come in McKeesport?
In half of years the last 32°F night comes after May 2; in one year in ten it comes after May 20. Waiting until May 20 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Pennsylvania climateThe statewide normals and every place in the state
- West Mifflin, PA3 miles from this station, 52.4°F a year
- Braddock, PA4 miles from this station, 52.4°F a year
- Murrysville, PA9 miles from this station, 52.4°F a year
- Donora, PA12 miles from this station, 52.1°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made