Weather & Climate in Herlong, CA

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

Herlong experiences four distinct seasons with an average annual temperature of 50°F (10°C). Winters average 33°F in January while summers reach 70°F in July. The area gets 316 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 14.3 inches (drier than the 38-inch national average). The area receives 25.6 inches of snow annually, a moderate snowfall amount. Air quality is rated Good with a median AQI of 48. The city sits at an elevation of 4,125 feet.

Temperature

33°F Jan (1°C) 70°F Jul (21°C)

Annual Average	50.3°F
	7% below US avg
January Average	33°F (1°C)
July Average	70°F (21°C)
Sunny Days	316 days/yr

Geography

Elevation	4,125 ft (1,257 m)
Area	1.6 sq mi (4.2 km²)
Population Density	197/sq mi
Coordinates	40.1417°N, 120.1397°W
Timezone	America/Los_Angeles
County	Lassen County County
Nearest Airport	Reno/Tahoe International (RNO) 49 miles away

Precipitation & Snow

Annual Rainfall 14.3"

62% below US avg

Snowfall 25.6"

Wettest Month (Jan) 2.17"

Driest Month (Jul) 0.35"

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)

Earthquake History

1,482 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.7.

May 24, 2013	2 km NNE of Canyondam, California	M5.7	78 km	8 km
May 11, 2023	Lake Almanor Earthquake	M5.5	83 km	6 km
Aug 10, 2001	3 km N of Blairsden, California	M5.2	55 km	5 km
May 12, 2023	4km NW of Canyondam, CA	M5.2	82 km	6 km
Apr 26, 2008	1 km NW of Mogul, Nevada	M5.1	71 km	3 km
May 24, 2013	1km NNW of Canyondam, CA	M4.9	80 km	4 km
Apr 26, 2008	0 km N of Mogul, Nevada	M4.8	71 km	3 km
Feb 10, 1993	28 km SW of Empire, Nevada	M4.8	55 km	5 km
Oct 30, 1998	4 km N of Tahoe Vista, California	M4.8	96 km	1 km
Jun 26, 2005	8 km NNW of Tahoe Vista, California	M4.8	93 km	-2 km
May 7, 2021	19km NW of Truckee, CA	M4.7	77 km	10 km
Mar 21, 2020	5 km NE of Indian Hills, Nevada	M4.5	120 km	8 km
Nov 15, 1995	9 km SW of Cold Springs, Nevada	M4.5	58 km	-1 km
Aug 4, 2016	5 km WNW of Patton Village, California	M4.5	6 km	7 km
Apr 5, 2024	6 km NW of Belden, CA	M4.4	99 km	8 km
Jun 14, 1991	8 km SW of Hat Creek, California	M4.4	143 km	11 km
Apr 6, 1992	4 km NNE of Lemmon Valley, Nevada	M4.4	59 km	10 km
Nov 18, 1994	3 km E of Carson City, Nevada	M4.4	114 km	6 km
Nov 5, 1997	3 km ENE of East Quincy, California	M4.4	66 km	-1 km
Dec 2, 2000	5 km NW of Kingvale, California	M4.4	92 km	5 km

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

Tornado History

13 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF1. Total: 1 injury.

Date	Rating	Distance	Path	Fatalities
Aug 15, 2020	EF1	47 km	0.1 mi	0
Aug 14, 2020	EF1	46 km	0.4 mi	0
Nov 3, 1973	EF1	40 km	25.9 mi	0
Jul 16, 1973	EF1	68 km	1.0 mi	0
Jul 20, 2015	EF0	24 km	3.2 mi	0
Jul 24, 2004	EF0	63 km	0.1 mi	0
Aug 2, 2003	EF0	70 km	0.1 mi	0
Aug 1, 2002	EF0	71 km	0.1 mi	0
Feb 10, 2000	EF0	73 km	0.5 mi	0
Jul 13, 1999	EF0	73 km	0.1 mi	0
Jul 30, 1998	EF0	62 km	2.0 mi	0
Jun 11, 1998	EF0	97 km	0.1 mi	0
Apr 23, 1964	EF0	59 km	1.0 mi	0

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

Nearby Volcanoes

2 volcanoes within 200 km. Closest: Lassen Volcanic Center (122 km).

Name	Type	Elevation	Last Eruption	Distance
Lassen Volcanic Center	Stratovolcano	3,187 m (10,456 ft)	1917	122 km
Soda Lakes	Maar(s)	1,251 m (4,104 ft)	Unknown	128 km

Source: Smithsonian Institution Global Volcanism Program (GVP).

Wildfire History

20 wildfires (100+ acres) recorded within 100 km. Largest: DIXIE (979,795 acres, 2021).

Year	Name	Acres Burned	Distance
2021	DIXIE	979,795	65 km
2020	NORTH COMPLEX	316,556	96 km
2012	RUSH	306,811	52 km
2021	SUGAR	108,368	21 km
2017	TRUCKEE	98,411	91 km
2017	TOHAKUM 2	92,711	67 km
2017	LONG VALLEY	80,456	25 km
2012	CHIPS	79,978	90 km
2001	OBSERVATION	67,432	66 km
2007	MOONLIGHT	65,718	51 km
2019	WALKER	58,747	38 km
2018	PERRY	53,734	67 km
2000	STORRIE	49,588	98 km
1994	COTTONWOOD	47,912	60 km
1999	FISH COMPLEX (FISH SPRINGS)	47,030	28 km
2020	LOYALTON	45,484	49 km
1987	CLARK	39,194	15 km
2016	TULE	35,341	43 km
2017	EARTHSTONE	35,305	81 km
2020	NORTH	34,120	35 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	33°F (1°C)	2.2 in	Wettest
February	36°F (2°C)	1.8 in
March	41°F (5°C)	1.4 in
April	46°F (8°C)	0.7 in
May	55°F (13°C)	0.9 in
June	63°F (17°C)	0.7 in
July	70°F (21°C)	0.4 in	Warmest, Driest
August	69°F (21°C)	0.4 in
September	62°F (17°C)	0.6 in
October	51°F (11°C)	0.9 in
November	40°F (4°C)	1.9 in
December	32°F (0°C)	1.9 in	Coldest

Herlong has a seasonal temperature swing of 38°F / from 32°F in December to 70°F in July. Total annual precipitation is 13.7 inches, with January being the wettest month (2.2") and July the driest (0.4").

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