Weather & Climate in Junction City, CA

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

Junction City enjoys a temperate climate with an average annual temperature of 57°F (14°C). Winters average 42°F in January while summers reach 75°F in July. The area gets 275 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 35.8 inches. The area receives 2.7 inches of snow annually. Air quality is rated Good with a median AQI of 48. The city sits at an elevation of 2,665 feet.

Temperature

42°F Jan (6°C) 75°F Jul (24°C)

Annual Average	56.8°F
	5% above US avg
January Average	42°F (6°C)
July Average	75°F (24°C)
Sunny Days	275 days/yr

Geography

Elevation	2,665 ft (812 m)
Area	28.0 sq mi (72.4 km²)
Population Density	41/sq mi
Coordinates	40.7360°N, 123.0846°W
Timezone	America/Los_Angeles
County	Trinity County County
Nearest Airport	Redding Regional (RDD) 44 miles away

Precipitation & Snow

Annual Rainfall 35.8"

6% below US avg

Snowfall 2.7"

Wettest Month (Dec) 7.05"

Driest Month (Jul) 0.24"

Air Quality

AQI Median	48.0
Rating	Good

Natural Hazard Risk

Overall Risk	Relatively Low
Risk Score	79.5 / 100
Social Vulnerability	82.6 / 100
Community Resilience	37.0 / 100

Hazard Breakdown

Tornado	Very Low
Earthquake	Relatively Low
Wildfire	Relatively High
Flood	Relatively Moderate
Hail	Very Low
Strong Wind	Very Low
Heat Wave	Relatively Low
Winter Weather	Very Low
Lightning	Very Low
Drought	No Rating
Cold Wave	No Rating
Landslide	Relatively High
Volcano	Very Low
Avalanche	Very Low

Source: FEMA National Risk Index v1.20 (Dec 2025)

Earthquake History

4,202 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M7.2.

Apr 25, 1992	The 1992 Petrolia, California Earthquake	M7.2	107 km	10 km
Apr 26, 1992	32 km SW of Ferndale, California	M6.6	130 km	22 km
Jan 10, 2010	The 2010 Eureka, California Earthquake	M6.5	136 km	29 km
Apr 26, 1992	30 km WSW of Ferndale, California	M6.5	130 km	19 km
Aug 17, 1991	30 km SSW of Scotia, California	M6.0	115 km	8 km
Jan 28, 2015	40 km SW of Ferndale, California	M5.7	137 km	17 km
Feb 13, 2012	26 km NNW of Willow Creek, California	M5.6	75 km	27 km
Jan 22, 1997	33 km SW of Scotia, California	M5.6	121 km	23 km
Jun 23, 2019	6km SSW of Petrolia, CA	M5.6	115 km	9 km
Dec 26, 1994	7 km WNW of Fields Landing, California	M5.4	103 km	23 km
Jan 16, 1990	30 km NW of Shelter Cove, California	M5.4	116 km	4 km
Apr 30, 2008	3 km NNW of Burnt Ranch, California	M5.4	36 km	28 km
Jan 1, 2023	15km SE of Rio Dell, CA	M5.4	83 km	31 km
Mar 8, 1992	27 km NW of Shelter Cove, California	M5.3	114 km	9 km
Mar 18, 2020	15km W of Petrolia, CA	M5.2	124 km	29 km
Jun 17, 2002	29 km WNW of Fields Landing, California	M5.2	124 km	17 km
Jan 26, 1997	33 km SW of Scotia, California	M5.2	122 km	22 km
Jul 18, 2021	12km W of Petrolia, CA	M5.1	122 km	31 km
Nov 26, 1998	7km NW of Redding, CA	M5.1	58 km	25 km
Jul 19, 2006	35 km SSW of Ferndale, California	M5.0	125 km	20 km

Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Tornado History

6 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2.

Date	Rating	Distance	Path	Fatalities
May 9, 1980	EF2	100 km	0.1 mi	0
Mar 29, 1958	EF2	89 km	2.0 mi	0
Mar 5, 1978	EF1	97 km	0.1 mi	0
Jan 25, 2018	EF0	91 km	0.0 mi	0
Apr 4, 2013	EF0	98 km	0.8 mi	0
Mar 5, 1978	EF0	90 km	0.1 mi	0

Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).

Tsunami History

1 tsunami recorded within 500 km. Highest wave on record: 1.8 m (6 ft).

Year	Location	Cause	Max Wave	Deaths	Distance
1992	CAPE MENDOCINO, N. CALIFORNIA	Earthquake	1.8 m	—	112 km

Source: NOAA/NCEI Historical Tsunami Database.

Nearby Volcanoes

4 volcanoes within 200 km. Closest: Shasta (106 km).

Name	Type	Elevation	Last Eruption	Distance
Shasta	Stratovolcano	4,317 m (14,163 ft)	1250	106 km
Lassen Volcanic Center	Stratovolcano	3,187 m (10,456 ft)	1917	136 km
Medicine Lake	Shield	2,412 m (7,913 ft)	1060	161 km
Clear Lake	Volcanic field	1,439 m (4,721 ft)	Unknown	198 km

Source: Smithsonian Institution Global Volcanism Program (GVP).

Wildfire History

20 wildfires (100+ acres) recorded within 100 km. Largest: AUGUST COMPLEX (1,068,802 acres, 2020).

Year	Name	Acres Burned	Distance
2020	AUGUST COMPLEX	1,068,802	89 km
2018	CARR	233,710	42 km
2021	MONUMENT	226,125	15 km
2021	HAYPRESS	204,549	44 km
2020	RED SALMON COMPLEX	147,535	50 km
1999	MEGRAM- ORLEANS	125,337	44 km
2021	MCFARLAND	121,554	53 km
2006	PIGEON	100,962	26 km
2021	MCCASH	95,762	93 km
2008	YOLLA BOLLY COMPLEX (IRON)	94,888	72 km
2015	RIVER COMPLEX	78,531	31 km
2008	PANTHER	71,448	93 km
2018	DELTA	63,732	60 km
2017	ISLAND	62,931	76 km
2020	ZOGG	56,941	53 km
1987	YELLOW 2	53,626	78 km
2012	BAGLEY	47,731	93 km
2018	HIRZ	46,700	73 km
2012	NORTH PASS	43,689	94 km
2008	BEAR WALLOW COMPLEX (UKONOM)	40,029	71 km

Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	42°F (6°C)	7.0 in
February	41°F (5°C)	5.7 in
March	44°F (6°C)	5.5 in
April	47°F (9°C)	2.4 in
May	54°F (12°C)	1.3 in
June	61°F (16°C)	0.7 in
July	75°F (24°C)	0.2 in	Warmest, Driest
August	69°F (20°C)	0.6 in
September	63°F (17°C)	1.1 in
October	55°F (13°C)	2.8 in
November	44°F (7°C)	6.5 in
December	38°F (3°C)	7.1 in	Coldest, Wettest

Junction City has a seasonal temperature swing of 37°F / from 38°F in December to 75°F in July. Total annual precipitation is 40.8 inches, with December being the wettest month (7.1") and July the driest (0.2").

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