Bel Air South, Maryland climate: NOAA's gridded normals for the city, beside the nearest station records
NOAA's gridded 1991-2020 normals put Bel Air South's center at January lows of 24°F and July highs of 88°F, a yearly mean of 55.1°F and 46.8 inches of precipitation. No NOAA station keeps a record under the city's name. The nearest station record, Aberdeen (8 miles E, 57 ft), has January lows of 25°F and July highs of 86°F.
57,702 people (Census Bureau 2024). Distances and directions are from the city's center.
- Jan 41° 24°
- Feb 44° 26°
- Mar 53° 33°
- Apr 65° 42°
- May 75° 53°
- Jun 83° 62°
- Jul 88° 67°
- Aug 85° 65°
- Sep 79° 58°
- Oct 67° 46°
- Nov 56° 36°
- Dec 46° 29°
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 Bel Air South's center.
What is each month like in Bel Air South?
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. | Aberdeen high | Aberdeen low |
|---|---|---|---|---|---|---|
| January | 41°F | 24°F | 32.8°F | 3.25 | 42°F | 25°F |
| February | 44°F | 26°F | 34.9°F | 2.69 | 44°F | 27°F |
| March | 53°F | 33°F | 42.8°F | 4.23 | 53°F | 33°F |
| April | 65°F | 42°F | 53.8°F | 3.48 | 65°F | 43°F |
| May | 75°F | 53°F | 63.6°F | 3.92 | 73°F | 53°F |
| June | 83°F | 62°F | 72.5°F | 4.31 | 82°F | 62°F |
| July | 88°F | 67°F | 77.3°F | 4.68 | 86°F | 68°F |
| August | 85°F | 65°F | 75.2°F | 4.26 | 84°F | 66°F |
| September | 79°F | 58°F | 68.3°F | 4.66 | 78°F | 59°F |
| October | 67°F | 46°F | 56.8°F | 3.96 | 67°F | 47°F |
| November | 56°F | 36°F | 45.8°F | 3.35 | 56°F | 37°F |
| December | 46°F | 29°F | 37.5°F | 3.96 | 46°F | 30°F |
In metric: a yearly mean of 12.8°C, January lows of −4°C, July highs of 31°C and 1,187 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 Bel Air South 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 |
|---|---|---|---|---|---|---|---|---|
| AberdeenAberdeen Phillips Field | 8 mi E | 57 ft | 55.2°F | 25°F | 86°F | 47.1 | – | April 10 |
| Conowingo Dam | 12 mi NE | 40 ft | 55.4°F | 25°F | 88°F | 48.3 | – | April 3 |
| Cylburn | 21 mi SW | 235 ft | 56.1°F | 27°F | 87°F | – | – | April 2 |
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 Bel Air South?
NOAA's grid gives no snow, frost dates or records, so these come from the nearest station record, Aberdeen (8 miles E, 57 ft). NOAA publishes no snowfall normal for it; the nearest record that has one, Octoraro Lake (24 miles away), gets 18 inches a year. The last spring frost (32°F) comes after April 10 in half of years and the first autumn frost before October 30. Its record high is 105°F (1936) and its record low −13°F (1934) (kept since 1919).
The USDA's 2023 Plant Hardiness Zone Map puts Bel Air South in zone 7b across its 3 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%).
Aberdeen'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 Bel Air South; the nearest record's month pages have them.
Source: NOAA NCEI 1991-2020 normals, station USW00013701; records: ACIS; 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 Bel Air South, ZIP code by ZIP code?
3 ZIP code areas lie wholly or partly in Bel Air South. On NOAA's grid 21009 is the warmest (56.2°F a year) and 21015 the coolest (54.8°F), a spread of 1.4°F. 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 |
|---|---|---|---|---|---|---|---|---|
| 21009 | 7b | 56.2°F | 26°F | 88°F | 46.0 | Aberdeen (6 mi) | April 10 | October 30 |
| 21014 | 7b | 55.1°F | 24°F | 88°F | 46.6 | Aberdeen (11 mi) | April 10 | October 30 |
| 21015 | 7b | 54.8°F | 24°F | 87°F | 46.9 | Aberdeen (8 mi) | April 10 | October 30 |
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.