Rockwall, Texas climate: NOAA's gridded normals for the city, beside the nearest station records
NOAA's gridded 1991-2020 normals put Rockwall's center at January lows of 35°F and July highs of 94°F, a yearly mean of 65.2°F and 40.3 inches of precipitation. No NOAA station keeps a record under the city's name. The nearest station record, Lavon (9 miles N, 510 ft), has January lows of 34°F and July highs of 92°F.
53,547 people (Census Bureau 2024). Distances and directions are from the city's center.
- Jan 55° 35°
- Feb 60° 39°
- Mar 67° 47°
- Apr 75° 53°
- May 82° 62°
- Jun 90° 70°
- Jul 94° 74°
- Aug 95° 73°
- Sep 88° 66°
- Oct 78° 55°
- Nov 66° 45°
- Dec 57° 37°
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 Rockwall's center.
What is each month like in Rockwall?
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. | Lavon high | Lavon low |
|---|---|---|---|---|---|---|
| January | 55°F | 35°F | 45.3°F | 2.78 | 54°F | 34°F |
| February | 60°F | 39°F | 49.6°F | 2.88 | 58°F | 38°F |
| March | 67°F | 47°F | 57.0°F | 3.77 | 65°F | 46°F |
| April | 75°F | 53°F | 64.1°F | 3.45 | 73°F | 53°F |
| May | 82°F | 62°F | 72.2°F | 4.72 | 80°F | 63°F |
| June | 90°F | 70°F | 80.1°F | 3.87 | 88°F | 70°F |
| July | 94°F | 74°F | 83.9°F | 2.11 | 92°F | 73°F |
| August | 95°F | 73°F | 84.0°F | 2.32 | 93°F | 73°F |
| September | 88°F | 66°F | 77.1°F | 3.03 | 87°F | 66°F |
| October | 78°F | 55°F | 66.4°F | 4.70 | 77°F | 55°F |
| November | 66°F | 45°F | 55.6°F | 3.21 | 65°F | 45°F |
| December | 57°F | 37°F | 47.2°F | 3.44 | 56°F | 36°F |
In metric: a yearly mean of 18.4°C, January lows of 2°C, July highs of 35°C and 1,023 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 Rockwall 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 |
|---|---|---|---|---|---|---|---|---|
| LavonLavon Dam | 9 mi N | 510 ft | 64.2°F | 34°F | 92°F | 39.8 | 0 | March 10 |
| TerrellTerrell Municipal Airport | 17 mi SE | 475 ft | 66.3°F | 36°F | 96°F | 38.4 | – | March 11 |
| Richardson | 18 mi W | 678 ft | 65.8°F | 36°F | 94°F | 41.9 | – | March 7 |
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 Rockwall?
NOAA's grid gives no snow, frost dates or records, so these come from the nearest station record, Lavon (9 miles N, 510 ft). It gets 0 inches of snow in a normal year. The last spring frost (32°F) comes after March 10 in half of years and the first autumn frost before November 19. Its record high is 111°F (1998) and its record low −3°F (1989) (kept since 1953).
The USDA's 2023 Plant Hardiness Zone Map puts Rockwall in zone 8b across its 2 ZIP code areas.
Over a year 79% of the sunlight that would reach the ground under clear skies gets through the clouds in the area (4.6 kWh per square metre a day, NASA POWER 2001-2020); July is the sunniest month (87%) and February the cloudiest (69%).
Lavon'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 Rockwall; the nearest record's month pages have them.
Source: NOAA NCEI 1991-2020 normals, station USC00415094; 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 Rockwall, ZIP code by ZIP code?
2 ZIP code areas lie wholly or partly in Rockwall. On NOAA's grid 75032 is the warmest (65.4°F a year) and 75087 the coolest (65.2°F), so the city is nearly uniform. Each row also names the nearest station record and its frost dates.
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.