Dundalk, Maryland climate: NOAA's gridded normals for the city, beside the nearest station records
NOAA's gridded 1991-2020 normals put Dundalk's center at January lows of 28°F and July highs of 89°F, a yearly mean of 57.6°F and 46.6 inches of precipitation. No NOAA station keeps a record under the city's name. The nearest station record, Maryland Science Center Baltimore (6 miles W, 20 ft), has January lows of 30°F and July highs of 90°F.
65,441 people (Census Bureau 2024). Distances and directions are from the city's center.
- Jan 43° 28°
- Feb 46° 29°
- Mar 54° 36°
- Apr 67° 46°
- May 76° 56°
- Jun 85° 65°
- Jul 89° 71°
- Aug 87° 69°
- Sep 80° 62°
- Oct 68° 50°
- Nov 57° 39°
- Dec 48° 32°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
The months above are NOAA's gridded normals at Dundalk's center.
What is each month like in Dundalk?
NOAA's grid estimates the normals every 5 km or so from the stations around each point, terrain included. It smooths between stations, so night lows at the heart of a large city can run warmer than the grid shows: at five big-city airports we compared, the grid's highs were within about 1°F of the station and its lows 1-6°F cooler. The nearest record's high and low are beside each month.
| Month | High | Low | Mean | Precip. | Maryland Science Center Baltimore high | Maryland Science Center Baltimore low |
|---|---|---|---|---|---|---|
| January | 43°F | 28°F | 35.7°F | 3.16 | 44°F | 30°F |
| February | 46°F | 29°F | 37.5°F | 2.81 | 47°F | 32°F |
| March | 54°F | 36°F | 45.2°F | 4.11 | 55°F | 39°F |
| April | 67°F | 46°F | 56.3°F | 3.58 | 67°F | 48°F |
| May | 76°F | 56°F | 65.8°F | 4.12 | 76°F | 58°F |
| June | 85°F | 65°F | 75.0°F | 4.07 | 85°F | 68°F |
| July | 89°F | 71°F | 79.8°F | 4.57 | 90°F | 73°F |
| August | 87°F | 69°F | 77.9°F | 4.44 | 87°F | 71°F |
| September | 80°F | 62°F | 70.9°F | 4.55 | 80°F | 65°F |
| October | 68°F | 50°F | 59.3°F | 4.03 | 69°F | 53°F |
| November | 57°F | 39°F | 48.2°F | 3.37 | 58°F | 43°F |
| December | 48°F | 32°F | 40.1°F | 3.76 | 48°F | 35°F |
In metric: a yearly mean of 14.2°C, January lows of −2°C, July highs of 32°C and 1,183 mm of precipitation a year.
Source: NOAA NCEI U.S. Monthly Gridded Climate Normals 1991-2020 (nClimGrid, accession 0245564); NOAA NCEI 1991-2020 station normals. The grid cell holding the city's Census center point.
What do the station records around Dundalk say?
Each row is a NOAA station's own 1991-2020 normals, with the snow and frost dates the grid does not give. A record downhill or nearer the coast than the city can run warmer, one uphill cooler: compare the elevations.
| Record | Where | Elevation | Year | Jan low | Jul high | Precip. | Snow | Last frost |
|---|---|---|---|---|---|---|---|---|
| Maryland Science Center Baltimore | 6 mi W | 20 ft | 59.1°F | 30°F | 90°F | 43.7 | – | March 24 |
| Cylburn | 10 mi NW | 235 ft | 56.1°F | 27°F | 87°F | – | – | April 2 |
| BaltimoreBaltimore Wash International Airport | 12 mi SW | 156 ft | 56.2°F | 25°F | 89°F | 45.0 | 19 | April 10 |
Source: NOAA NCEI 1991-2020 U.S. Climate Normals; place center and population: Census Bureau 2024. Last frost: the median last spring date of 32°F.
How much snow, how late a frost, what zone and how much sun in Dundalk?
NOAA's grid gives no snow, frost dates or records, so these come from the nearest station record, Maryland Science Center Baltimore (6 miles W, 20 ft). NOAA publishes no snowfall normal for it; the nearest record that has one, Baltimore (12 miles SW), gets 19 inches a year. The last spring frost (32°F) comes after March 24 in half of years and the first autumn frost before November 21.
The USDA's 2023 Plant Hardiness Zone Map puts Dundalk in zone 8a across its 2 ZIP code areas.
Over a year 74% of the sunlight that would reach the ground under clear skies gets through the clouds in the area (4.0 kWh per square metre a day, NASA POWER 2001-2020); July is the sunniest month (82%) and December the cloudiest (67%).
Maryland Science Center Baltimore's page has its months, frost probabilities, records by month and recent years. NOAA's grid has monthly figures only, so there are no day-by-day month pages for Dundalk; the nearest record's month pages have them.
Source: NOAA NCEI 1991-2020 normals, station USW00093784; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; sunshine: NASA POWER.
How does the climate vary across Dundalk, ZIP code by ZIP code?
2 ZIP code areas lie wholly or partly in Dundalk. On NOAA's grid 21224 is the warmest (57.8°F a year) and 21222 the coolest (57.6°F), so the city is nearly uniform. Each row also names the nearest station record and its frost dates.
| ZIP code | Zone | Year | Jan low | Jul high | Precip. | Nearest record | Last frost | First frost |
|---|---|---|---|---|---|---|---|---|
| 21222 | 8a | 57.6°F | 28°F | 89°F | 46.6 | Maryland Science Center Baltimore (6 mi) | March 24 | November 21 |
| 21224 | 8a | 57.8°F | 28°F | 89°F | 46.6 | Maryland Science Center Baltimore (4 mi) | March 24 | November 21 |
Source: Census Bureau 2020 ZCTA-to-place relationship file and ZCTA centers; NOAA NCEI gridded and station normals, 1991-2020. A ZIP area counts when at least a tenth of its land (and 0.5 km²) is in the city; its figures are the grid cell at its center; frost dates are the nearest record's medians of 32°F.