Oxon Hill, Maryland climate: Normal weather by month, frost dates and records
Oxon Hill's normal year runs from 27°F January nights to 88°F July afternoons, with 46.8 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 31°C, 1,189 mm of precipitation a year.
- NOAA stationOxon Hill
- Station IDUSC00186800
- Location38.80°N 76.99°W
- Elevation190 ft (58 m)
- From the center1 miles
- Population (census place)18,491
On October 23, the normal high in Oxon Hill is 66°F and the normal low 45°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 Oxon Hill.
- Jan 44° 27°
- Feb 48° 28°
- Mar 56° 35°
- Apr 67° 45°
- May 76° 55°
- Jun 84° 64°
- Jul 88° 69°
- Aug 87° 67°
- Sep 80° 61°
- Oct 68° 48°
- Nov 57° 39°
- Dec 48° 31°
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 Oxon Hill each month?
July is the warmest month, with normal highs of 88°F; January the coldest, with normal lows of 27°F. The most precipitation falls in July (4.96 in), the least in February (2.89 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 44°F | 27°F | 35.5°F | 3.08 | 11 | <1 | 22 | 9 h 40 min |
| February | 48°F | 28°F | 37.9°F | 2.89 | 11 | <1 | 20 | 10 h 40 min |
| March | 56°F | 35°F | 45.4°F | 4.04 | 11 | <1 | 13 | 11 h 50 min |
| April | 67°F | 45°F | 56.1°F | 3.38 | 12 | 1 | 1 | 13 h 10 min |
| May | 76°F | 55°F | 65.2°F | 4.45 | 13 | 2 | <1 | 14 h 20 min |
| June | 84°F | 64°F | 74.1°F | 4.85 | 11 | 7 | <1 | 14 h 50 min |
| July | 88°F | 69°F | 78.4°F | 4.96 | 11 | 14 | <1 | 14 h 40 min |
| August | 87°F | 67°F | 76.9°F | 4.16 | 10 | 10 | <1 | 13 h 40 min |
| September | 80°F | 61°F | 70.3°F | 4.37 | 8 | 4 | <1 | 12 h 30 min |
| October | 68°F | 48°F | 58.3°F | 3.75 | 10 | <1 | <1 | 11 h 20 min |
| November | 57°F | 39°F | 47.8°F | 3.13 | 9 | <1 | 6 | 10 h 10 min |
| December | 48°F | 31°F | 39.5°F | 3.75 | 11 | <1 | 18 | 9 h 30 min |
| Year (annual) | 67°F | 47°F | 57.1°F | 46.81 | 129 | 38 | 80 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 7°C | −3°C | 1.9°C | 78 mm |
| February | 9°C | −2°C | 3.3°C | 73 mm |
| March | 13°C | 2°C | 7.4°C | 103 mm |
| April | 20°C | 7°C | 13.4°C | 86 mm |
| May | 24°C | 13°C | 18.4°C | 113 mm |
| June | 29°C | 18°C | 23.4°C | 123 mm |
| July | 31°C | 20°C | 25.8°C | 126 mm |
| August | 30°C | 20°C | 24.9°C | 106 mm |
| September | 27°C | 16°C | 21.3°C | 111 mm |
| October | 20°C | 9°C | 14.6°C | 95 mm |
| November | 14°C | 4°C | 8.8°C | 80 mm |
| December | 9°C | 0°C | 4.2°C | 95 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Washington (4 miles away), gets 14 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00186800; 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 Oxon Hill?
Normal highs sit between 65°F and 85°F in April, May, June, September and October. Of those, September has the fewest days with rain (8).
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 USC00186800.
When is the last frost in Oxon Hill?
In Oxon Hill, the last spring frost (32°F) comes after April 3 in half of years and after April 15 in one year in ten; the first autumn frost comes before November 8 in half of years and before October 24 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 31 year in 10 after April 15; 9 in 10 after March 19
- First autumn frost, half of years before
- November 81 year in 10 before October 24; 9 in 10 before November 23
NOAA puts the median frost-free season at 217 days, and the season without a hard freeze (28°F) at 244 days.
A hard freeze (28°F) comes after March 21 in half of springs and before November 19 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Oxon Hill in zones 7b to 8a across its 2 ZIP code areas (7b in 20744, the largest). By the map's own method, the average of each year's coldest night over 1991-2020, Oxon Hill's NOAA station is in zone 8a: the coldest night of a typical year reaches 11°F (18 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 Maryland · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00186800; 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.
What hardiness zone is each Oxon Hill ZIP code in?
The USDA's 2023 map gives each ZIP code area one zone. Oxon Hill's 2 ZIP code areas run from zone 7b to 8a: 1 in 7b and 1 in 8a. Each ZIP's frost dates are in the frost tool.
Source: USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; ZIP areas in the place: Census Bureau 2020 ZCTA-to-place relationship file. A ZIP area counts when at least a tenth of its land (and 0.5 km²) lies in the place.
How hot and how cold does it get in Oxon Hill?
In a normal year in Oxon Hill, 38 days a year reach 90°F (1 of them 100°F or more), 80 nights fall to 32°F or colder and 129 days bring measurable precipitation.
- Days at 90°F or more
- 38a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 80a normal year
- Days that stay below freezing
- 10high of 32°F or less
- Days with 0.01 inch of precipitation
- 129a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00186800.
How sunny is Oxon Hill?
Over a year 77% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Oxon Hill, 4.2 kWh per square metre a day. July is the sunniest month (84%) and January the cloudiest (71%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 71% | 2.2 |
| February | 72% | 3.0 |
| March | 72% | 4.0 |
| April | 75% | 5.2 |
| May | 76% | 5.8 |
| June | 82% | 6.4 |
| July | 84% | 6.3 |
| August | 82% | 5.6 |
| September | 79% | 4.5 |
| October | 76% | 3.4 |
| November | 76% | 2.5 |
| December | 71% | 1.9 |
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 Oxon Hill need?
A normal year in Oxon Hill brings 4,244 heating degree days, 21% fewer than the median U.S. place (5,373), and 1,407 cooling degree days, 55% more than the median (908). Five months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 4,190 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 913 | 0 |
| February | 759 | 0 |
| March | 609 | 2 |
| April | 294 | 25 |
| May | 94 | 100 |
| June | 7 | 280 |
| July | 0 | 415 |
| August | 0 | 369 |
| September | 26 | 185 |
| October | 238 | 29 |
| November | 516 | 1 |
| December | 789 | 0 |
| Year (annual) | 4,244 | 1,407 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00186800. 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 Oxon Hill's climate compare?
Oxon Hill is warmer than 19 of the other 25 places with their own NOAA record in Maryland, and wetter than 13. 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, Oxon Hill 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 Oxon Hill share this climate record?
18 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.
- Lake Ridge, VA45,007 people · 18 mi SW
- Woodbridge, VA43,443 people · 18 mi SW
- Lorton, VA21,961 people · 14 mi SW
- Woodlawn, VA21,828 people · 8 mi SW
- Hybla Valley, VA17,877 people · 6 mi SW
- Kingstowne, VA17,436 people · 8 mi W
- Fort Hunt, VA16,519 people · 5 mi SW
- Newington, VA13,824 people · 12 mi W
- Groveton, VA13,563 people · 7 mi SW
- Huntington, VA13,250 people · 4 mi W
- Mount Vernon, VA13,120 people · 8 mi SW
- Fort Belvoir, VA8,107 people · 10 mi SW
- Laurel Hill, VA7,551 people · 15 mi SW
- Belle Haven, VA6,590 people · 4 mi W
- Potomac Mills, VA6,122 people · 19 mi SW
- Hayfield, VA4,252 people · 8 mi W
- Mason Neck, VA2,059 people · 14 mi SW
- Occoquan, VA1,063 people · 16 mi SW
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 Oxon Hill's climate
What is the coldest month in Oxon Hill?
January, with a normal high of 44°F and a normal low of 27°F. The warmest is July (88°F by day, 69°F at night).
Does it snow in Oxon Hill?
Yes. NOAA publishes no 1991-2020 snowfall normal for Oxon Hill's NOAA station; the nearest record that keeps one, Washington (4 miles away), records 14 inches of snow in a normal year.
What is the rainiest month in Oxon Hill?
July, with 4.96 in of precipitation in a normal year; the driest is February with 2.89 in.
What plant hardiness zone is Oxon Hill in?
The USDA's 2023 map puts Oxon Hill in zones 7b to 8a across its 2 ZIP code areas (7b in 20744, the largest). By the same method at Oxon Hill's NOAA station, the coldest night of a typical year reaches 11°F (18 years, 1991-2020): zone 8a.
How late can frost come in Oxon Hill?
In half of years the last 32°F night comes after April 3; in one year in ten it comes after April 15. Waiting until April 15 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Maryland climateThe statewide normals and every place in the state
- Washington, DC4 miles from this station, 59.3°F a year
- National Arboretum DC, MD8 miles from this station, 58.3°F a year
- Dalecarlia Reservoir, MD12 miles from this station, 56.2°F a year
- Upper Marlboro, MD13 miles from this station, 56.0°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made