Aberdeen, Maryland climate: Normal weather by month, frost dates and records
Aberdeen's normal year runs from 25°F January nights to 86°F July afternoons, with 47.1 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 12.9°C, January lows of −4°C, July highs of 30°C, 1,197 mm of precipitation a year.
- NOAA stationAberdeen Phillips Field
- Station IDUSW00013701
- Location39.47°N 76.17°W
- Elevation57 ft (17 m)
- From the center3 miles
- Population18,451
On October 14, the normal high in Aberdeen is 68°F and the normal low 47°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Aberdeen.
- Jan 42° 25°
- Feb 44° 27°
- Mar 53° 33°
- Apr 65° 43°
- May 73° 53°
- Jun 82° 62°
- Jul 86° 68°
- Aug 84° 66°
- Sep 78° 59°
- Oct 67° 47°
- Nov 56° 37°
- Dec 46° 30°
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 Aberdeen each month?
July is the warmest month, with normal highs of 86°F; January the coldest, with normal lows of 25°F. The most precipitation falls in July (4.84 in), the least in February (2.78 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 42°F | 25°F | 33.4°F | 3.26 | – | <1 | 21 | 9 h 40 min |
| February | 44°F | 27°F | 35.6°F | 2.78 | – | <1 | 19 | 10 h 40 min |
| March | 53°F | 33°F | 42.8°F | 4.10 | – | <1 | 13 | 11 h 50 min |
| April | 65°F | 43°F | 54.0°F | 3.49 | – | <1 | 2 | 13 h 10 min |
| May | 73°F | 53°F | 62.9°F | 3.98 | – | 1 | <1 | 14 h 20 min |
| June | 82°F | 62°F | 72.2°F | 4.28 | – | 5 | <1 | 15 h |
| July | 86°F | 68°F | 77.1°F | 4.84 | – | 11 | <1 | 14 h 40 min |
| August | 84°F | 66°F | 75.1°F | 4.21 | – | 6 | <1 | 13 h 50 min |
| September | 78°F | 59°F | 68.5°F | 4.84 | – | 2 | <1 | 12 h 30 min |
| October | 67°F | 47°F | 56.7°F | 4.17 | – | <1 | 1 | 11 h 10 min |
| November | 56°F | 37°F | 46.1°F | 3.27 | – | <1 | 9 | 10 h |
| December | 46°F | 30°F | 38.0°F | 3.89 | – | <1 | 18 | 9 h 20 min |
| Year (annual) | 65°F | 46°F | 55.2°F | 47.11 | – | 26 | 83 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 5°C | −4°C | 0.8°C | 83 mm |
| February | 7°C | −3°C | 2.0°C | 71 mm |
| March | 11°C | 1°C | 6.0°C | 104 mm |
| April | 18°C | 6°C | 12.2°C | 89 mm |
| May | 23°C | 12°C | 17.2°C | 101 mm |
| June | 28°C | 17°C | 22.3°C | 109 mm |
| July | 30°C | 20°C | 25.1°C | 123 mm |
| August | 29°C | 19°C | 23.9°C | 107 mm |
| September | 26°C | 15°C | 20.3°C | 123 mm |
| October | 19°C | 8°C | 13.7°C | 106 mm |
| November | 13°C | 3°C | 7.8°C | 83 mm |
| December | 8°C | −1°C | 3.3°C | 99 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Chestertown (19 miles away), gets 17 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USW00013701; 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 Aberdeen?
Normal highs sit between 65°F and 85°F in May, June, August, September and October.
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 USW00013701.
When is the last frost in Aberdeen?
In Aberdeen, the last spring frost (32°F) comes after April 10 in half of years and after April 30 in one year in ten; the first autumn frost comes before October 30 in half of years and before October 14 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 101 year in 10 after April 30; 9 in 10 after March 27
- First autumn frost, half of years before
- October 301 year in 10 before October 14; 9 in 10 before November 12
NOAA puts the median frost-free season at 201 days, and the season without a hard freeze (28°F) at 226 days.
A hard freeze (28°F) comes after March 29 in half of springs and before November 10 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Aberdeen in zone 7b in ZIP code 21001.
Frost dates for every NOAA station in Maryland · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USW00013701; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. 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 Aberdeen?
In a normal year in Aberdeen, 26 days a year reach 90°F and 83 nights fall to 32°F or colder.
- Days at 90°F or more
- 26a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 83a normal year
- Days that stay below freezing
- 11high of 32°F or less
The highest temperature in this station's record (since 1919) is 105°F, on July 10, 1936; the lowest is −13°F, on February 28, 1934.
The wettest calendar year on that record is 2018, with 63.43 in; the snowiest season is 2009–10, with 55.0 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USW00013701; records: ACIS (NOAA Regional Climate Centers), station USW00013701. Records use complete months only; a month missing more than three days is left out.
How sunny is Aberdeen?
Over a year 74% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Aberdeen, 4.0 kWh per square metre a day. July is the sunniest month (82%) and December the cloudiest (67%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 67% | 2.0 |
| February | 69% | 2.9 |
| March | 68% | 3.8 |
| April | 72% | 5.0 |
| May | 72% | 5.5 |
| June | 78% | 6.2 |
| July | 82% | 6.2 |
| August | 80% | 5.4 |
| September | 76% | 4.3 |
| October | 72% | 3.2 |
| November | 73% | 2.3 |
| December | 67% | 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 Aberdeen need?
A normal year in Aberdeen brings 4,706 heating degree days, 12% fewer than the median U.S. place (5,373), and 1,171 cooling degree days, 29% 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 3,767 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 979 | 0 |
| February | 823 | 0 |
| March | 689 | 1 |
| April | 344 | 14 |
| May | 131 | 67 |
| June | 14 | 231 |
| July | 0 | 373 |
| August | 1 | 314 |
| September | 43 | 148 |
| October | 279 | 22 |
| November | 566 | 1 |
| December | 837 | 0 |
| Year (annual) | 4,706 | 1,171 |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00013701. 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.
Has Aberdeen been warmer than normal lately?
2025 averaged 54.9°F, 0.3°F below the 1991-2020 normal of 55.2°F. 3 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 56.2°F | +1.0°F | 47.36 |
| 2022 | 54.9°F | −0.4°F | 48.80 |
| 2023 | 56.6°F | +1.4°F | 40.54 |
| 2024 | 56.8°F | +1.5°F | 42.24 |
| 2025 | 54.9°F | −0.3°F | 38.76 |
Source: observed years: ACIS, station USW00013701. A year counts only with all twelve months complete.
How does Aberdeen's climate compare?
Aberdeen is warmer than 8 of the other 25 places with their own NOAA record in Maryland, and wetter than 15. Across the 7,247 U.S. stations with normals, its annual mean of 55.2°F is warmer than 61%.
In the Köppen classification computed from these normals, Aberdeen 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 Aberdeen share this climate record?
13 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.
- Bel Air South, MDalso near: Conowingo Dam (12 mi, 55.4°F a year); Cylburn (21 mi, 56.1°F a year)57,702 people · 8 mi W
- Bel Air North, MD31,599 people · 12 mi NW
- Edgewood, MD25,170 people · 8 mi SW
- Havre de Grace, MD15,222 people · 6 mi NE
- Joppatowne, MD13,397 people · 10 mi W
- Bel Air, MD10,395 people · 10 mi NW
- Fallston, MD9,954 people · 15 mi W
- Riverside, MD6,149 people · 4 mi W
- Abingdon, MD5,727 people · 6 mi W
- Pleasant Hills, MD3,955 people · 12 mi W
- Perryman, MD2,366 people · 2 mi W
- Aberdeen Proving Ground, MD2,343 people · 2 mi SE
- Betterton, MD283 people · 9 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 Aberdeen's climate
What is the coldest month in Aberdeen?
January, with a normal high of 42°F and a normal low of 25°F. The warmest is July (86°F by day, 68°F at night).
Does it snow in Aberdeen?
Yes. NOAA publishes no 1991-2020 snowfall normal for Aberdeen's NOAA station; the nearest record that keeps one, Chestertown (19 miles away), records 17 inches of snow in a normal year.
What is the rainiest month in Aberdeen?
July, with 4.84 in of precipitation in a normal year; the driest is February with 2.78 in.
What plant hardiness zone is Aberdeen in?
The USDA's 2023 map puts Aberdeen in zone 7b in ZIP code 21001.
How late can frost come in Aberdeen?
In half of years the last 32°F night comes after April 10; in one year in ten it comes after April 30. Waiting until April 30 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Maryland climateThe statewide normals and every place in the state
- Conowingo Dam, MD12 miles from this station, 55.4°F a year
- Chestertown, MD19 miles from this station, 56.0°F a year
- Octoraro Lake, PA24 miles from this station, 52.7°F a year
- Newark, DE26 miles from this station, 55.7°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made