Sunnyvale, TX
Full City Profile · Texas · Rockwall County County
3.7
/5.0
B+
Good
8,069
Population
488/sq mi density
$157,500
Median Income
$61,080 per capita
$540,500
Home Value
$632,167 Zillow
$1,216
Median Rent
29.2% income on rent
68°F
Avg Temperature
113
Violent Crime/100K
1,141 property/100K
B+
Overall
3.7 / 5.0
Good overall score based on economy, affordability, safety and education
A
Economy
4.1 / 5.0
$157,500 median income, 6.6% unemployment
A+
Affordability
4.8 / 5.0
$540,500 home value, $1,216/mo rent
F
Safety
1.0 / 5.0
113 violent crimes/100K
A+
Education
5.0 / 5.0
56.0% bachelor's degree or higher
Sunnyvale enjoys a temperate climate with an average annual temperature of 68°F (20°C). Winters average 48°F in January while summers reach 87°F in July. Annual precipitation totals 37.5 inches. The area receives 0.2 inches of snow annually. Air quality is rated Good with a median AQI of 34.
Temperature
48°F Jan (9°C)
87°F Jul (31°C)
| Annual Average | 68.0°F |
| 26% above US avg | |
| January Average | 48°F (9°C) |
| July Average | 87°F (31°C) |
Geography
| Elevation | 494 ft (151 m) |
| Area | 16.5 sq mi (42.8 km²) |
| Population Density | 488/sq mi |
| Coordinates | 32.7998°N, 96.5586°W |
| Timezone | America/Chicago |
| County | Rockwall County County |
| Nearest Airport | Dallas Love Field (DAL) 17 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 34.0 |
| Rating | Good |
| Good Days % | 92.6% |
| Unhealthy Days | 2 |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0418 ppm |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 70.7 / 100 |
| Social Vulnerability | 10.6 / 100 |
| Community Resilience | 86.3 / 100 |
Hazard Breakdown
| Tornado | Relatively High |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Relatively Low |
| Flood | Relatively Low |
| Hail | Relatively Moderate |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively Low |
| Lightning | Relatively Low |
| Ice Storm | Relatively Low |
| Drought | Relatively Low |
| Cold Wave | Relatively Moderate |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 48°F (9°C) | 2.5 in | Coldest |
| February | 52°F (11°C) | 2.6 in | |
| March | 60°F (15°C) | 3.7 in | |
| April | 67°F (20°C) | 2.8 in | |
| May | 75°F (24°C) | 4.8 in | Wettest |
| June | 83°F (29°C) | 3.1 in | |
| July | 87°F (31°C) | 2.1 in | Warmest |
| August | 87°F (31°C) | 1.7 in | Driest |
| September | 80°F (27°C) | 3.0 in | |
| October | 69°F (21°C) | 4.5 in | |
| November | 58°F (14°C) | 3.1 in | |
| December | 50°F (10°C) | 3.5 in |
Sunnyvale has a seasonal temperature swing of 40°F / from 48°F in January to 87°F in July. Total annual precipitation is 37.5 inches, with May being the wettest month (4.8") and August the driest (1.7").