Marcus Hook, Pennsylvania climate: Normal weather by month, frost dates and records
Marcus Hook's normal year runs from 27°F January nights to 89°F July afternoons, with 41.6 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 13.9°C, January lows of −3°C, July highs of 32°C, 1,058 mm of precipitation a year.
- NOAA stationMarcus Hook
- Station IDUSC00365390
- Location39.83°N 75.43°W
- Elevation10 ft (3 m)
- From the center1 miles
- Population2,467
On October 23, the normal high in Marcus Hook is 66°F and the normal low 47°F, and the chance of measurable rain or snow is 24%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Marcus Hook.
- Jan 43° 27°
- Feb 46° 28°
- Mar 53° 35°
- Apr 66° 45°
- May 75° 55°
- Jun 84° 65°
- Jul 89° 70°
- Aug 87° 69°
- Sep 80° 61°
- Oct 68° 50°
- Nov 57° 40°
- Dec 48° 32°
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 Marcus Hook each month?
July is the warmest month, with normal highs of 89°F; January the coldest, with normal lows of 27°F. The most precipitation falls in July (4.81 in), the least in February (2.22 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 43°F | 27°F | 34.8°F | 3.15 | 9 | <1 | 20 | 9 h 40 min |
| February | 46°F | 28°F | 36.9°F | 2.22 | 7 | <1 | 17 | 10 h 40 min |
| March | 53°F | 35°F | 43.9°F | 3.93 | 9 | <1 | 9 | 11 h 50 min |
| April | 66°F | 45°F | 55.4°F | 3.48 | 10 | <1 | <1 | 13 h 10 min |
| May | 75°F | 55°F | 65.0°F | 3.16 | 9 | 2 | <1 | 14 h 20 min |
| June | 84°F | 65°F | 74.1°F | 3.31 | 9 | 5 | <1 | 15 h |
| July | 89°F | 70°F | 79.5°F | 4.81 | 9 | 12 | <1 | 14 h 40 min |
| August | 87°F | 69°F | 77.7°F | 3.68 | 8 | 7 | <1 | 13 h 50 min |
| September | 80°F | 61°F | 70.7°F | 4.36 | 9 | 1 | <1 | 12 h 30 min |
| October | 68°F | 50°F | 59.0°F | 3.69 | 7 | <1 | <1 | 11 h 10 min |
| November | 57°F | 40°F | 48.7°F | 2.61 | 8 | <1 | 3 | 10 h |
| December | 48°F | 32°F | 39.9°F | 3.25 | 9 | <1 | 14 | 9 h 20 min |
| Year (annual) | 66°F | 48°F | 57.1°F | 41.65 | 102 | 27 | 65 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 6°C | −3°C | 1.6°C | 80 mm |
| February | 8°C | −2°C | 2.7°C | 56 mm |
| March | 12°C | 1°C | 6.6°C | 100 mm |
| April | 19°C | 7°C | 13.0°C | 88 mm |
| May | 24°C | 13°C | 18.3°C | 80 mm |
| June | 29°C | 18°C | 23.4°C | 84 mm |
| July | 32°C | 21°C | 26.4°C | 122 mm |
| August | 30°C | 20°C | 25.4°C | 93 mm |
| September | 27°C | 16°C | 21.5°C | 111 mm |
| October | 20°C | 10°C | 15.0°C | 94 mm |
| November | 14°C | 4°C | 9.3°C | 66 mm |
| December | 9°C | 0°C | 4.4°C | 83 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Wilmington Porter Research (7 miles away), gets 12 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00365390; 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 Marcus Hook?
Normal highs sit between 65°F and 85°F in April, May, June, September and October. Of those, October has the fewest days with rain (7).
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 USC00365390.
When is the last frost in Marcus Hook?
In Marcus Hook, the last spring frost (32°F) comes after March 30 in half of years and after April 9 in one year in ten; the first autumn frost comes before November 16 in half of years and before November 2 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
- March 301 year in 10 after April 9; 9 in 10 after March 16
- First autumn frost, half of years before
- November 161 year in 10 before November 2; 9 in 10 before December 2
NOAA puts the median frost-free season at 230 days, and the season without a hard freeze (28°F) at 252 days.
A hard freeze (28°F) comes after March 20 in half of springs and before November 28 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Marcus Hook in zone 7b in ZIP code 19061. By the map's own method, the average of each year's coldest night over 1991-2020, Marcus Hook's NOAA station is in zone 8a: the coldest night of a typical year reaches 12°F (19 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 Pennsylvania · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00365390; 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 Marcus Hook?
In a normal year in Marcus Hook, 27 days a year reach 90°F (1 of them 100°F or more), 65 nights fall to 32°F or colder and 102 days bring measurable precipitation.
- Days at 90°F or more
- 27a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 65a normal year
- Days that stay below freezing
- 10high of 32°F or less
- Days with 0.01 inch of precipitation
- 102a normal year
The highest temperature in this station's record (since 1919) is 106°F, on August 27, 1948; the lowest is −12°F, on February 9, 1934.
The wettest calendar year on that record is 1971, with 61.18 in; the snowiest season is 1977–78, with 48.4 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00365390; records: ACIS (NOAA Regional Climate Centers), station USC00365390. Records use complete months only; a month missing more than three days is left out.
How sunny is Marcus Hook?
Over a year 75% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Marcus Hook, 4.1 kWh per square metre a day. July is the sunniest month (82%) and December the cloudiest (68%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 68% | 2.0 |
| February | 71% | 2.9 |
| March | 69% | 3.8 |
| April | 73% | 5.0 |
| May | 72% | 5.6 |
| June | 78% | 6.2 |
| July | 82% | 6.2 |
| August | 80% | 5.4 |
| September | 77% | 4.4 |
| October | 73% | 3.2 |
| November | 74% | 2.3 |
| December | 68% | 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 much heating and cooling does Marcus Hook need?
A normal year in Marcus Hook brings 4,289 heating degree days, 20% fewer than the median U.S. place (5,373), and 1,457 cooling degree days, 60% 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 4,198 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 934 | 0 |
| February | 788 | 0 |
| March | 653 | 1 |
| April | 306 | 16 |
| May | 94 | 94 |
| June | 9 | 284 |
| July | 0 | 448 |
| August | 0 | 395 |
| September | 23 | 193 |
| October | 212 | 26 |
| November | 491 | 0 |
| December | 778 | 0 |
| Year (annual) | 4,289 | 1,457 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00365390. 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 Marcus Hook's climate compare?
Marcus Hook is warmer than 107 of the other 107 places with their own NOAA record in Pennsylvania, and wetter than 20. Across the 7,247 U.S. stations with normals, its annual mean of 57.1°F is warmer than 67%.
In the Köppen classification computed from these normals, Marcus Hook 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 Marcus Hook share this climate record?
15 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.
- Claymont, DE9,543 people · 2 mi SW
- Edgemoor, DE6,671 people · 6 mi SW
- Elsmere, DE6,234 people · 11 mi SW
- Beckett, NJ5,072 people · 6 mi SE
- Greenville, DE3,100 people · 10 mi W
- Swedesboro, NJ2,766 people · 8 mi SE
- Bellefonte, DE1,249 people · 5 mi SW
- Auburn, NJ1,209 people · 10 mi S
- Newport, DE909 people · 12 mi SW
- Arden, DE437 people · 3 mi W
- Pedricktown, NJ380 people · 4 mi S
- Harrisonville, NJ302 people · 13 mi SE
- Ardentown, DE258 people · 3 mi SW
- Ardencroft, DE234 people · 3 mi SW
- Bridgeport, NJ208 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 Marcus Hook's climate
What is the coldest month in Marcus Hook?
January, with a normal high of 43°F and a normal low of 27°F. The warmest is July (89°F by day, 70°F at night).
Does it snow in Marcus Hook?
Yes. NOAA publishes no 1991-2020 snowfall normal for Marcus Hook's NOAA station; the nearest record that keeps one, Wilmington Porter Research (7 miles away), records 12 inches of snow in a normal year.
What is the rainiest month in Marcus Hook?
July, with 4.81 in of precipitation in a normal year; the driest is February with 2.22 in.
What plant hardiness zone is Marcus Hook in?
The USDA's 2023 map puts Marcus Hook in zone 7b in ZIP code 19061. By the same method at Marcus Hook's NOAA station, the coldest night of a typical year reaches 12°F (19 years, 1991-2020): zone 8a.
How late can frost come in Marcus Hook?
In half of years the last 32°F night comes after March 30; in one year in ten it comes after April 9. Waiting until April 9 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Pennsylvania climateThe statewide normals and every place in the state
- Wilmington Porter Research, DE7 miles from this station, 53.4°F a year
- Philadelphia, PA11 miles from this station, 56.3°F a year
- Wilmington, DE14 miles from this station, 55.5°F a year
- West Chester, PA15 miles from this station, 52.4°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made