Ayer, MA
Full City Profile · Massachusetts · Middlesex County County
3.3
/5.0
B
Good
3,012
Population
2,265/sq mi density
$81,286
Median Income
$49,852 per capita
$417,300
Home Value
$575,271 Zillow
$1,228
Median Rent
29.2% income on rent
49°F
Avg Temperature
309
Violent Crime/100K
367 property/100K
B
Overall
3.3 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
4.5 / 5.0
$81,286 median income, 2.9% unemployment
B+
Affordability
3.8 / 5.0
$417,300 home value, $1,228/mo rent
F
Safety
1.0 / 5.0
309 violent crimes/100K
B+
Education
3.9 / 5.0
35.9% bachelor's degree or higher
Ayer experiences four distinct seasons with an average annual temperature of 49°F (9°C). Winters average 25°F in January while summers reach 72°F in July. Annual precipitation totals 43.4 inches. The area receives 59.0 inches of snow annually. Air quality is rated Good with a median AQI of 37.
Temperature
25°F Jan (-4°C)
72°F Jul (22°C)
| Annual Average | 48.9°F |
| 9% below US avg | |
| January Average | 25°F (-4°C) |
| July Average | 72°F (22°C) |
Geography
| Elevation | 323 ft (98 m) |
| Area | 1.4 sq mi (3.6 km²) |
| Population Density | 2,265/sq mi |
| Coordinates | 42.5622°N, 71.5848°W |
| Timezone | America/New_York |
| County | Middlesex County County |
| Nearest Airport | Worcester Regional (ORH) 25 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 37.0 |
| Rating | Good |
| Good Days % | 85.8% |
| Unhealthy Days | 0 |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0382 ppm |
| NO₂ (Nitrogen Dioxide) | 15.2 ppb |
| PM2.5 (Fine Particles) | 6.6 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 97.0 / 100 |
| Social Vulnerability | 15.8 / 100 |
| Community Resilience | 89.8 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Relatively High |
| Earthquake | Relatively Moderate |
| Wildfire | Relatively Low |
| Flood | Relatively High |
| Hail | Very Low |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively High |
| Ice Storm | Very High |
| Drought | Relatively Moderate |
| Cold Wave | Relatively High |
| Landslide | Very Low |
| Coastal Flood | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 25°F (-4°C) | 2.7 in | Coldest, Driest |
| February | 27°F (-3°C) | 2.8 in | |
| March | 35°F (2°C) | 3.8 in | |
| April | 47°F (8°C) | 3.8 in | |
| May | 58°F (14°C) | 3.6 in | |
| June | 67°F (19°C) | 4.1 in | |
| July | 72°F (22°C) | 3.5 in | Warmest |
| August | 71°F (22°C) | 3.4 in | |
| September | 63°F (17°C) | 4.0 in | |
| October | 51°F (10°C) | 4.5 in | Wettest |
| November | 40°F (5°C) | 3.6 in | |
| December | 31°F (-1°C) | 3.7 in |
Ayer has a seasonal temperature swing of 48°F / from 25°F in January to 72°F in July. Total annual precipitation is 43.4 inches, with October being the wettest month (4.5") and January the driest (2.7").