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Janesville, CA
Full City Profile · California · Lassen County County
2.9
/5.0
C+
Fair
2,447
Population
72/sq mi density
$70,938
Median Income
$37,453 per capita
$289,400
Home Value
$301,532 Zillow
$1,365
Median Rent
44.3% income on rent
50°F
Avg Temperature
316 sunny days/yr
711
Violent Crime/100K
2,093 property/100K
C+
Overall
2.9 / 5.0
Fair overall score based on economy, affordability, safety and education
A
Economy
4.4 / 5.0
$70,938 median income, 2.1% unemployment
A
Affordability
4.4 / 5.0
$289,400 home value, $1,365/mo rent
F
Safety
1.0 / 5.0
711 violent crimes/100K (87% above avg)
D
Education
2.0 / 5.0
12.1% bachelor's degree or higher
Janesville experiences four distinct seasons with an average annual temperature of 50°F (10°C). Winters average 33°F in January while summers reach 71°F in July. The area gets 316 sunny days per year. Annual precipitation totals 13.0 inches. Air quality is rated Good with a median AQI of 48.
Temperature
33°F Jan (0°C)
71°F Jul (21°C)
| Annual Average | 50.2°F |
| 7% below US avg | |
| January Average | 33°F (0°C) |
| July Average | 71°F (21°C) |
| Sunny Days | 316 days/yr |
Geography
| Elevation | 4,103 ft (1,251 m) |
| Area | 13.2 sq mi (34.2 km²) |
| Population Density | 72/sq mi |
| Coordinates | 40.3011°N, 120.4903°W |
| Timezone | America/Los_Angeles |
| County | Lassen County County |
| Nearest Airport | Reno/Tahoe International (RNO) 67 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 48.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 73.1 / 100 |
| Social Vulnerability | 69.3 / 100 |
| Community Resilience | 56.6 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Relatively Moderate |
| Flood | Relatively Moderate |
| Hail | Very Low |
| Strong Wind | Very Low |
| Heat Wave | Very Low |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively Low |
| Drought | Relatively Moderate |
| Cold Wave | Very Low |
| Landslide | Very Low |
| Volcano | Relatively Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Nearby Volcanoes
4 volcanoes within 200 km. Closest: Lassen Volcanic Center (89 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Lassen Volcanic Center | Stratovolcano | 3,187 m (10,456 ft) | 1917 | 89 km |
| Soda Lakes | Maar(s) | 1,251 m (4,104 ft) | Unknown | 163 km |
| Medicine Lake | Shield | 2,412 m (7,913 ft) | 1060 | 171 km |
| Shasta | Stratovolcano | 4,317 m (14,163 ft) | 1250 | 189 km |
Source: Smithsonian Institution Global Volcanism Program (GVP). Sorted by distance.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 33°F (0°C) | 2.7 in | Wettest |
| February | 35°F (2°C) | 2.2 in | |
| March | 41°F (5°C) | 1.9 in | |
| April | 46°F (8°C) | 0.8 in | |
| May | 53°F (12°C) | 1.0 in | |
| June | 61°F (16°C) | 0.6 in | |
| July | 71°F (21°C) | 0.3 in | Warmest, Driest |
| August | 67°F (20°C) | 0.3 in | |
| September | 60°F (16°C) | 0.6 in | |
| October | 50°F (10°C) | 1.2 in | |
| November | 39°F (4°C) | 2.2 in | |
| December | 32°F (0°C) | 2.3 in | Coldest |
Janesville has a seasonal temperature swing of 39°F / from 32°F in December to 71°F in July. Total annual precipitation is 16.1 inches, with January being the wettest month (2.7") and July the driest (0.3").