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Weather & Climate in Porterville, CA

Temperature, precipitation, air quality, natural hazards, and monthly weather data.

Porterville enjoys a temperate climate with an average annual temperature of 66°F (19°C). Winters average 49°F in January while summers reach 83°F in July. The area gets 330 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 11.0 inches (drier than the 38-inch national average). Air quality is rated Good with a median AQI of 48. The city sits at an elevation of 443 feet.

Temperature

49°F Jan (10°C) 83°F Jul (29°C)
Annual Average65.7°F
22% above US avg
January Average49°F (10°C)
July Average83°F (29°C)
Sunny Days330 days/yr

Geography

Elevation443 ft (135 m)
Area17.7 sq mi (45.8 km²)
Population Density3,335/sq mi
Coordinates36.0635°N, 119.0336°W
TimezoneAmerica/Los_Angeles
CountyKings County County
Nearest AirportFresno Yosemite International (FAT)
62 miles away

Precipitation & Snow

Annual Rainfall 11.0"
71% below US avg
Wettest Month (Jan) 1.81"
Driest Month (Aug) 0.04"

Air Quality

AQI Median48.0
RatingGood

Natural Hazard Risk

Overall RiskRelatively Moderate
Risk Score92.4 / 100
Social Vulnerability65.7 / 100
Community Resilience7.7 / 100

Hazard Breakdown

Tornado Very Low
Earthquake Relatively Moderate
Wildfire Relatively Low
Flood Relatively Moderate
Hail Relatively Low
Strong Wind Very Low
Heat Wave Relatively High
Winter Weather Very Low
Lightning Relatively Low
Drought Very High
Cold Wave No Rating
Landslide Very Low
Avalanche Very Low
Source: FEMA National Risk Index v1.20 (Dec 2025)

Earthquake History

6,970 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M7.1.

Jul 6, 2019 Ridgecrest Earthquake Sequence M7.1 133 km 8 km
Jul 4, 2019 Ridgecrest Earthquake Sequence M6.4 144 km 11 km
Sep 28, 2004 2004 Parkfield, California Earthquake M6.0 123 km 8 km
Jun 24, 2020 18km SSE of Lone Pine, CA M5.8 104 km 5 km
Sep 20, 1995 16km NNE of Ridgecrest, California M5.8 130 km 5 km
Jul 11, 1992 12km NW of California City, California M5.7 129 km 10 km
Jul 6, 2019 15km ESE of Little Lake, CA M5.5 117 km 5 km
Jul 6, 2019 20km E of Little Lake, CA M5.4 123 km 7 km
Jul 5, 2019 16km W of Searles Valley, CA M5.4 136 km 7 km
Aug 17, 1995 17km N of Ridgecrest, California M5.4 128 km 5 km
Nov 27, 1996 27km E of Coso Junction, California M5.3 124 km 0 km
Mar 6, 1998 28km E of Coso Junction, California M5.2 125 km 0 km
Aug 7, 2024 24 km SW of Lamont, CA M5.2 106 km 12 km
May 28, 1993 21km SW of Lamont, California M5.2 102 km 21 km
Oct 3, 2009 18km NE of Olancha, CA M5.2 111 km -2 km
Jan 7, 1996 16km N of Ridgecrest, California M5.2 129 km 3 km
Jul 17, 2001 7km ESE of Coso Junction, CA M5.2 104 km 2 km
Mar 7, 1998 30km E of Coso Junction, California M5.0 127 km 0 km
Sep 29, 2004 25km SSW of Bodfish, California M5.0 84 km 3 km
Sep 29, 2004 8 km NW of Parkfield, California M5.0 133 km 11 km
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Tornado History

42 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 5 injuries.

Date Rating Distance Path Fatalities
Apr 5, 1980 EF2 69 km 15.0 mi 0
Jan 17, 2019 EF1 98 km 0.3 mi 0
Nov 22, 1996 EF1 86 km 0.8 mi 0
Feb 28, 1991 EF1 49 km 0.2 mi 0
Mar 8, 1986 EF1 77 km 4.0 mi 0
Mar 28, 1982 EF1 77 km 5.0 mi 0
Feb 19, 1980 EF1 100 km 1.7 mi 0
Mar 14, 1979 EF1 83 km 2.0 mi 0
Nov 1, 1964 EF1 48 km 1.0 mi 0
Feb 19, 1962 EF1 50 km 0.6 mi 0
Jun 2, 2019 EF0 86 km 0.2 mi 0
May 19, 2019 EF0 87 km 0.4 mi 0
Mar 22, 2018 EF0 51 km 1.2 mi 0
Feb 12, 2018 EF0 80 km 0.3 mi 0
Feb 23, 2015 EF0 94 km 0.5 mi 0
Nov 9, 2012 EF0 24 km 0.3 mi 0
Feb 27, 2010 EF0 88 km 0.5 mi 0
Jan 27, 2008 EF0 42 km 2.0 mi 0
May 9, 2005 EF0 86 km — 0
Oct 20, 2004 EF0 53 km 0.5 mi 0
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).

Tsunami History

1 tsunami recorded within 500 km.

Year Location Cause Max Wave Deaths Distance
1901 MONTEREY BAY, N. CALIFORNIA Eruption + Earthquake — — 132 km
Source: NOAA/NCEI Historical Tsunami Database.

Nearby Volcanoes

4 volcanoes within 200 km. Closest: Golden Trout Creek (72 km).

Name Type Elevation Last Eruption Distance
Golden Trout Creek Volcanic field 2,886 m (9,469 ft) -5550 72 km
Mammoth Mountain Lava dome(s) 3,369 m (11,053 ft) 1260 174 km
Ubehebe Craters Maar(s) 752 m (2,467 ft) -150 177 km
Mono-Inyo Craters Lava dome(s) 2,796 m (9,173 ft) 1380 194 km
Source: Smithsonian Institution Global Volcanism Program (GVP).

Wildfire History

20 wildfires (100+ acres) recorded within 100 km. Largest: CASTLE (174,424 acres, 2020).

Year Name Acres Burned Distance
2020 CASTLE 174,424 45 km
2002 MCNALLY 146,540 57 km
2015 ROUGH 146,369 89 km
2021 WINDY 97,831 40 km
2021 KNP COMPLEX 89,960 61 km
2000 MANTER 76,158 78 km
2016 ERSKINE 48,066 84 km
1997 LOKERN 46,139 93 km
2017 PIER 36,626 30 km
2008 PIUTE 36,251 89 km
2016 CEDAR 29,191 52 km
2021 FRENCH 27,331 59 km
2011 BRECKENRIDGE COMPLEX 27,229 81 km
1984 BODFISH 23,189 79 km
1990 STORMY 23,157 54 km
1996 SKYLINE 21,694 91 km
2017 LION 18,576 56 km
2011 LION 17,671 52 km
2010 BULL 17,238 60 km
2017 SCHAEFFER 16,100 60 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month Avg Temperature Precipitation Summary
January 49°F (10°C) 1.8 in Wettest
February 52°F (11°C) 1.8 in
March 56°F (13°C) 1.7 in
April 61°F (16°C) 1.0 in
May 69°F (20°C) 0.3 in
June 75°F (24°C) 0.1 in
July 83°F (29°C) 0.0 in Warmest, Driest
August 79°F (26°C) 0.0 in
September 74°F (23°C) 0.3 in
October 65°F (18°C) 0.6 in
November 53°F (12°C) 1.4 in
December 46°F (8°C) 1.4 in Coldest

Porterville has a seasonal temperature swing of 37°F / from 46°F in December to 83°F in July. Total annual precipitation is 10.4 inches, with January being the wettest month (1.8") and July the driest (0.0").

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